1. A method for adjusting battery energy feedback power of an electric vehicle is applied to a Battery Management System (BMS), and comprises the following steps:

acquiring a voltage value of each battery cell in a plurality of battery cells of the electric automobile;

if the voltage value of a first battery monomer in the plurality of battery monomers is different from the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated;

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer to obtain the maximum allowed energy recovery power of the first battery monomer.

2. The method of claim 1, wherein determining that the first battery cell is degraded if the voltage value of the first battery cell is different from the voltages of the other battery cells except the first battery cell, comprises:

in the discharging process of the plurality of battery monomers, if the voltage value of a first battery monomer is lower than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated; or

In the charging process of the plurality of battery monomers, if the voltage value of a first battery monomer is higher than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated.

3. The method for adjusting battery energy feedback power of an electric vehicle according to claim 1, wherein reducing the energy feedback power of the first battery cell to obtain the maximum allowable energy recovery power of the first battery cell when the first battery cell is attenuated comprises:

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer according to a preset energy recovery power value to obtain the maximum allowed energy recovery power of the first battery monomer, wherein the preset energy recovery power value is obtained according to big data and battery experimental data.

4. The method for adjusting battery energy feedback power of an electric vehicle of claim 1, wherein after obtaining the maximum allowable energy recovery power of the first battery cell, the method further comprises:

and sending the maximum allowed energy recovery power to a vehicle control unit VCU.

5. The method of claim 4, further comprising:

transmitting the maximum allowed energy recovery power to a remote monitoring platform through the VCU.

6. The device for adjusting the battery energy feedback power of the electric automobile is applied to a Battery Management System (BMS), and the method comprises the following steps:

the acquisition module is used for acquiring the voltage value of each battery cell in a plurality of battery cells of the electric automobile;

the determining module is used for determining that the first battery cell is attenuated if the voltage value of the first battery cell in the plurality of battery cells is different from the voltages of other battery cells except the first battery cell in the plurality of battery cells;

and the adjusting module is used for reducing the energy feedback power of the first battery monomer under the condition that the first battery monomer is attenuated to obtain the maximum allowed energy recovery power of the first battery monomer.

7. The apparatus of claim 6, wherein the determining module is specifically configured to:

in the discharging process of the plurality of battery monomers, if the voltage value of a first battery monomer is lower than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated; or

In the charging process of the plurality of battery monomers, if the voltage value of a first battery monomer is higher than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated.

8. The apparatus of claim 6, wherein the adjusting module is specifically configured to:

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer according to a preset energy recovery power value to obtain the maximum allowed energy recovery power of the first battery monomer, wherein the preset energy recovery power value is obtained according to big data and battery experimental data.

9. The device for adjusting battery energy feedback power of an electric vehicle of claim 6, further comprising:

and the sending module is used for sending the maximum allowed energy recovery power to a vehicle control unit VCU.

10. The apparatus of claim 9, wherein the sending module is further configured to send the maximum allowable energy recovery power to a remote monitoring platform via the VCU.

11. An electric vehicle comprising a plurality of battery cells and a battery management system, wherein the battery management system comprises the device for adjusting energy feedback power of the battery of the electric vehicle according to any one of claims 6 to 10.

Background

At present, the energy recovery power of the electric automobile is basically controlled according to the state of the whole automobile, automobile faults, the allowed energy recovery power of a battery, a hydraulic brake control unit and other information. However, the data of the operating vehicles are analyzed through big data, and it is found that the performance of one or more single batteries of an individual vehicle is reduced due to some reason, and when the vehicle is in energy recovery, the whole vehicle still carries out energy feedback according to normal power, at this time, the single battery is in overvoltage, and the battery management system BMS reports the fault information of 'single overvoltage'.

At present, the whole vehicle energy recovery modes adopted by most electric vehicles are all the modes, and the defects are as follows: the energy recovery in the mode is that the battery management system BMS limits the energy recovery power according to the normal parameters of the battery, and the problem that the battery continues to recover energy according to the specific recovery power after the performance of the battery is attenuated and the single body is in overvoltage under certain working conditions is not considered.

Disclosure of Invention

In view of the above problems, the present invention provides a method and an apparatus for adjusting battery energy feedback power of an electric vehicle, and an electric vehicle, so as to solve the problem that the recovered power cannot be adaptively changed for energy recovery after the performance of the battery is degraded.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a method for adjusting battery energy feedback power of an electric automobile is applied to a Battery Management System (BMS), and comprises the following steps:

acquiring a voltage value of each battery cell in a plurality of battery cells of the electric automobile;

if the voltage value of a first battery monomer in the plurality of battery monomers is different from the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated;

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer to obtain the maximum allowed energy recovery power of the first battery monomer.

Optionally, if a voltage value of a first battery cell in the plurality of battery cells is different from voltages of other battery cells except the first battery cell in the plurality of battery cells, determining that the first battery cell is attenuated, including:

in the discharging process of the plurality of battery monomers, if the voltage value of a first battery monomer is lower than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated; or

In the charging process of the plurality of battery monomers, if the voltage value of a first battery monomer is higher than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated.

Optionally, when the first battery cell is attenuated, reducing the energy feedback power of the first battery cell to obtain the maximum allowed energy recovery power of the first battery cell, including:

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer according to a preset energy recovery power value to obtain the maximum allowed energy recovery power of the first battery monomer, wherein the preset energy recovery power value is obtained according to big data and battery experimental data.

Optionally, after obtaining the maximum allowed energy recovery power of the first battery cell, the method for adjusting the battery energy feedback power of the electric vehicle further includes:

and sending the maximum allowed energy recovery power to a vehicle control unit VCU.

Optionally, the method for adjusting the battery energy feedback power of the electric vehicle further includes: transmitting the maximum allowed energy recovery power to a remote monitoring platform through the VCU.

The embodiment of the invention also provides a device for adjusting battery energy feedback power of an electric automobile, which is applied to a Battery Management System (BMS), and the device comprises:

the acquisition module is used for acquiring the voltage value of each battery cell in a plurality of battery cells of the electric automobile;

the determining module is used for determining that the first battery cell is attenuated if the voltage value of the first battery cell in the plurality of battery cells is different from the voltages of other battery cells except the first battery cell in the plurality of battery cells;

and the adjusting module is used for reducing the energy feedback power of the first battery monomer under the condition that the first battery monomer is attenuated to obtain the maximum allowed energy recovery power of the first battery monomer.

Optionally, the determining module is specifically configured to: in the discharging process of the plurality of battery monomers, if the voltage value of a first battery monomer is lower than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated; alternatively, the first and second electrodes may be,

in the charging process of the plurality of battery monomers, if the voltage value of a first battery monomer is higher than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated.

Optionally, the adjusting module is specifically configured to:

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer according to a preset energy recovery power value to obtain the maximum allowed energy recovery power of the first battery monomer, wherein the preset energy recovery power value is obtained according to big data and battery experimental data.

Optionally, the device for adjusting the battery energy feedback power of the electric vehicle further includes:

and the sending module is used for sending the maximum allowed energy recovery power to a vehicle control unit VCU.

Optionally, the sending module is further configured to send the maximum allowed energy recovery power to a remote monitoring platform through the VCU.

The embodiment of the invention also provides an electric automobile, which comprises a plurality of battery monomers and a battery management system, wherein the battery management system comprises the adjusting device for the battery energy feedback power of the electric automobile.

The scheme of the invention at least comprises the following beneficial effects:

according to the scheme, the voltage value of each battery monomer in the plurality of battery monomers is obtained, whether the voltage value of the first battery monomer is different from the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers is judged, if the voltage value of the first battery monomer is different from the voltages of the other battery monomers except the first battery monomer, the first battery monomer is attenuated, and at the moment, the energy feedback power of the first battery monomer is reduced.

Drawings

Fig. 1 is a flowchart illustrating a method for adjusting battery energy feedback power of an electric vehicle according to an embodiment of the invention;

FIG. 2 is a flowchart illustrating a method for adjusting battery energy feedback power of an electric vehicle according to an embodiment of the present invention;

fig. 3 is a device connection block diagram of an apparatus for adjusting battery energy feedback power of an electric vehicle according to an embodiment of the invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Fig. 1 is a flowchart illustrating a method for adjusting battery energy feedback power of an electric vehicle according to an embodiment of the present invention; referring to fig. 1, the method for adjusting battery energy feedback power of an electric vehicle according to the embodiment is applied to a battery management system BMS, and includes the following steps:

s1, acquiring a voltage value of each battery cell in a plurality of battery cells of the electric automobile;

s2, if the voltage value of a first battery cell in the plurality of battery cells is different from the voltages of other battery cells except the first battery cell in the plurality of battery cells, determining that the first battery cell is attenuated;

s3, reducing the energy feedback power of the first battery cell when the first battery cell is attenuated, to obtain the maximum allowable energy recovery power of the first battery cell.

The method comprises the steps of obtaining the voltage value of each battery monomer in the plurality of battery monomers, judging whether the voltage value of the first battery monomer is different from the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, if so, indicating that the first battery monomer is attenuated, and reducing the energy feedback power of the first battery monomer.

In specific implementation, if the voltage value of the first battery cell in the plurality of battery cells is different from the voltages of the other battery cells except the first battery cell in the plurality of battery cells, the step S2 determines that the first battery cell is attenuated, including:

in the discharging process of the plurality of battery monomers, if the voltage value of a first battery monomer is lower than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated; alternatively, the first and second electrodes may be,

in the charging process of the plurality of battery monomers, if the voltage value of a first battery monomer is higher than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated.

For example, the cell voltage of the 1# cell drops faster during the discharging process and is the lowest or lower of all the cells, and the cell voltage of the 1# cell rises faster during the charging process and is the highest or higher of all the cells. In general, the rising speed of one or more single bodies is faster in the charging process, and the falling speed of the single bodies is faster in the discharging process. At this time, it is determined that the 1# cell has decayed. The condition of the single battery under various working conditions is considered, and the judgment result is more accurate.

In specific implementation, the step S3, when the first battery cell is attenuated, reduces the energy feedback power of the first battery cell to obtain the maximum allowed energy recovery power of the first battery cell, and includes:

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer according to a preset energy recovery power value to obtain the maximum allowed energy recovery power of the first battery monomer, wherein the preset energy recovery power value is obtained according to big data and battery experimental data.

And the BMS comprehensively judges the battery test data according to the accumulation of big data analysis, and reduces (under a normal condition) energy feedback power or limits energy feedback to improve the accuracy of energy recovery.

In a specific implementation, in the step S3, after obtaining the maximum allowed energy recovery power of the first battery cell, the method for adjusting the battery energy feedback power of the electric vehicle may further include:

and S4, sending the maximum allowed energy recovery power to a vehicle control unit VCU.

And the whole vehicle control unit controls the energy recovery of the whole vehicle according to the maximum allowable energy recovery power sent by the BMS so as to prevent the phenomenon of reporting faults and avoid the problem of overcharging of the battery. During specific implementation, the maximum allowable energy recovery power CAN be sent to a vehicle control unit VCU through a CAN line, and cost is saved.

In specific implementation, the method for adjusting the battery energy feedback power of the electric vehicle further comprises the following steps:

and S4, sending the maximum allowed energy recovery power to a remote monitoring platform through the VCU. The remote monitoring platform can be a TSP platform (automobile remote service provider), receives the maximum allowable energy recovery power and fault information of the BMS, and sends vehicle related data information to the technical center; and analyzing the driving condition (driving habit of a driver and the like) and the charging condition (fast and slow charging times, frequency and the like) of the vehicle, and sending the analysis result to a technical center for technical engineers to analyze the data. The system is convenient for unified management and analysis, and is convenient for automobile manufacturers to refer and upgrade products. The VCU can send the maximum allowable energy recovery power to a remote monitoring platform in a wireless mode such as 3G, 4G or WIFI. The wireless transmission modes are mature in development, simple in implementation and maintenance and low in cost, and the cost and the implementation difficulty of the device are reduced. Of course, it will be understood by those skilled in the art that the above-mentioned embodiments are merely illustrative of the present invention, and other embodiments that can achieve the above-mentioned objects are within the scope of the present invention.

Referring to fig. 2, a specific working embodiment of the method for adjusting the battery energy feedback power of the electric vehicle of the present embodiment is as follows:

acquiring a voltage value of each battery cell in a plurality of battery cells of the electric automobile; if the voltage values of the plurality of battery monomers are basically consistent (a range can be preset, and the voltage values of the plurality of battery monomers are considered to be basically consistent if the voltage values of the plurality of battery monomers are different within the range), sending the voltage values to the VCU according to the normal energy recovery power so as to control the energy recovery power of the whole vehicle; if the voltage value of a first battery monomer in the plurality of battery monomers is different from the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated, and the voltages of all the battery monomers are basically consistent in a static state. When the vehicle runs (in a discharging stage), the voltage of a certain monomer or a plurality of monomers is relatively quickly reduced (such as a 1# monomer), the voltage of all the monomers is the lowest or the vehicle is in an energy recovery or charging state, and the voltage of the corresponding monomer (such as the 1# monomer) is quickly increased and is the highest; and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer to obtain the maximum allowed energy recovery power of the first battery monomer. The maximum allowable energy recovery power is sent to a vehicle control unit VCU, the VCU adjusts the energy recovery power of the whole vehicle according to the information sent by the BMS, sends the information to a customer service center according to the vehicle fault information, and sends related data and an analysis result to a technical center; receiving data returned by the remote monitoring platform, and performing system analysis on the data; and receiving the fault information of the monitoring platform, and arranging a service station to maintain the vehicle in time.

According to the method and the system, the energy recovery power of the vehicle is optimized according to big data analysis, battery performance parameters and the like, the fault reported by the vehicle is avoided, and when the phenomenon that the battery performance is reduced is judged, a service station is timely notified to overhaul the vehicle. The battery is analyzed in real time according to the actual running condition of the whole vehicle, the battery vehicle with performance attenuation is protected and maintained in time, the service station is informed to maintain the vehicle in time, and the safety and the driving experience of vehicle driving are greatly improved.

Fig. 3 is a device connection block diagram of an apparatus for adjusting battery energy feedback power of an electric vehicle according to an embodiment of the present invention; referring to fig. 3, the device for adjusting battery energy feedback power of an electric vehicle according to the present embodiment is applied to a battery management system BMS, and the device includes:

the acquisition module is used for acquiring the voltage value of each battery cell in a plurality of battery cells of the electric automobile;

the determining module is used for determining that the first battery cell is attenuated if the voltage value of the first battery cell in the plurality of battery cells is different from the voltages of other battery cells except the first battery cell in the plurality of battery cells;

and the adjusting module is used for reducing the energy feedback power of the first battery monomer under the condition that the first battery monomer is attenuated to obtain the maximum allowed energy recovery power of the first battery monomer.

The method comprises the steps of obtaining the voltage value of each battery monomer in the plurality of battery monomers, judging whether the voltage value of the first battery monomer is different from the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, if so, indicating that the first battery monomer is attenuated, and reducing the energy feedback power of the first battery monomer.

In a specific implementation, the determining module is specifically configured to: in the discharging process of the plurality of battery monomers, if the voltage value of a first battery monomer is lower than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated; alternatively, the first and second electrodes may be,

in the charging process of the plurality of battery monomers, if the voltage value of a first battery monomer is higher than the voltages of other battery monomers except the first battery monomer in the plurality of battery monomers, determining that the first battery monomer is attenuated.

For example, the cell voltage of the 1# cell drops faster during the discharging process and is the lowest or lower of all the cells, and the cell voltage of the 1# cell rises faster during the charging process and is the highest or higher of all the cells. In general, the rising speed of one or more single bodies is faster in the charging process, and the falling speed of the single bodies is faster in the discharging process. At this time, it is determined that the 1# cell has decayed. The condition of the single battery under various working conditions is considered, and the judgment result is more accurate.

In specific implementation, the adjusting module is specifically configured to:

and under the condition that the first battery monomer is attenuated, reducing the energy feedback power of the first battery monomer according to a preset energy recovery power value to obtain the maximum allowed energy recovery power of the first battery monomer, wherein the preset energy recovery power value is obtained according to big data and battery experimental data. And the BMS comprehensively judges the battery test data according to the accumulation of big data analysis, and reduces (under a normal condition) energy feedback power or limits energy feedback to improve the accuracy of energy recovery.

As shown in fig. 3, in an implementation, the apparatus for adjusting the battery energy feedback power of the electric vehicle may further include:

and the sending module is used for sending the maximum allowed energy recovery power to a vehicle control unit VCU.

And the whole vehicle control unit controls the energy recovery of the whole vehicle according to the maximum allowable energy recovery power sent by the BMS so as to prevent the phenomenon of reporting faults and avoid the problem of overcharging of the battery. During specific implementation, the maximum allowable energy recovery power CAN be sent to a vehicle control unit VCU through a CAN line, and cost is saved.

As shown in fig. 3, in an implementation, the transmitting module is further configured to transmit the maximum allowed energy recovery power to a remote monitoring platform through the VCU. The remote monitoring platform can be a TSP platform (automobile remote service provider), receives the maximum allowable energy recovery power and fault information of the BMS, and sends vehicle related data information to the technical center; and analyzing the driving condition (driving habit of a driver and the like) and the charging condition (fast and slow charging times, frequency and the like) of the vehicle, and sending the analysis result to a technical center for technical engineers to analyze the data. The system is convenient for unified management and analysis, and is convenient for automobile manufacturers to refer and upgrade products. The VCU can send the maximum allowable energy recovery power to a remote monitoring platform in a wireless mode such as 3G, 4G or WIFI. The wireless transmission modes are mature in development, simple in implementation and maintenance and low in cost, and the cost and the implementation difficulty of the device are reduced. Of course, it will be understood by those skilled in the art that the above-mentioned embodiments are merely illustrative of the present invention, and other embodiments that can achieve the above-mentioned objects are within the scope of the present invention.

The present invention further provides an electric vehicle, which includes a plurality of battery cells and a battery management system, wherein the battery management system includes the device for adjusting battery energy feedback power of the electric vehicle as described in any one of the above embodiments.

All the implementation modes in the device and the method are suitable for the embodiment of the automobile, and the same technical effect can be achieved.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.