Power battery equalization module heating system based on cloud computing

Abstract

The invention discloses a power battery equalization module heating system based on cloud computing. The power battery equalization module heating system comprises a vehicle end controller, an application end and a cloud data platform, the vehicle end controller sends the battery cell data to the cloud end data platform and receives an instruction from the cloud end data platform; the application end sends a preheating request instruction to the cloud data platform; after the cloud data platform receives the battery consistency fault signal, whether battery equalization control needs to be carried out on the power battery is judged through the battery cell data, and a corresponding control instruction is sent to the vehicle end controller; and after a preheating request signal sent by the application end is received, whether the balanced heat supply condition is met or not is judged through the vehicle end data, and a corresponding control instruction is sent to the vehicle end controller. The balance capacity is supplemented through the cloud instruction, the system function is heated for the battery by using the energy accumulated by battery balance, and the user experience is improved while the whole vehicle balance degree and accuracy are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power battery balanced charging, and in particular relates to a power battery balanced module heating system based on cloud computing. Summary of the invention

[0002] As the market share of new energy vehicles increases year by year, the market demand for high safety and long life of new energy is becoming increasingly urgent.

[0003] The current automotive power battery heating system is one of the main energy flows for on-board energy consumption. The electrical performance of the battery is often more limited in an environment where heating is required at low temperatures, so that the already low discharge capacity has to power the battery heating system for battery heating. The starting power becomes worse, the available power on the vehicle side will be less, and the battery power will be consumed more seriously, affecting the battery life.

[0004] Battery balancing technology is one of the important functions of the battery management system of new energy vehicles. Perfect battery balancing can achieve good consistency of the power battery pack and avoid the battery pack being fully charged or discharged due to inconsistent cells, thus affecting the endurance of the entire vehicle.

[0005] The application of cloud computing and 5G communication technology in new energy vehicles has solved the problem that some complex algorithms cannot be run on the vehicle-side controller, thereby achieving precise control of the vehicle. Summary of the invention

[0007] The purpose of the present invention is to provide a power battery balancing module heating system based on cloud computing, which aims to supplement the balancing capacity through cloud instructions and use the energy accumulated by battery balancing for the battery heating system function, thereby improving the balancing degree and accuracy of the entire vehicle while improving the user experience and helping to reduce battery life loss.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A power battery equalization module heating system based on cloud computing, including a vehicle-side controller, an application side and a cloud data platform;

[0010] The vehicle-side controller includes a BMS and a T-BOX. The BMS sends the battery cell data to the cloud data platform through the T-BOX, and receives instructions from the cloud data platform through the T-BOX.

[0011] The application end is used to send a preheating request instruction to the cloud data platform;

[0012] The cloud data platform receives the battery cell data sent by the vehicle-side controller in real time and processes the data; when a battery consistency fault signal is received, it determines whether battery balancing control of the power battery is required through the battery cell data, and sends corresponding control instructions to the vehicle-side controller; when a preheating request signal sent by the application end is received, it determines whether the balanced heating conditions are met through the vehicle-side data, and sends corresponding control instructions to the vehicle-side controller.

[0013] Furthermore, the BMS includes an energy storage module and an AFE control unit; the AFE control unit is used to collect power battery cell data, and to turn on or off battery balancing after receiving a battery balancing control instruction from the cloud data platform; the energy balanced by the power battery is used to charge the energy storage module; when the BMS receives a balanced heating control instruction from the cloud data platform, the energy storage module provides heat for the heating film system.

[0014] Furthermore, the energy storage module is not the only energy source of the heating film system. When the BMS does not receive the balanced heating control instruction sent by the cloud data platform, the heating film is still powered by the vehicle's high-voltage system.

[0015] Furthermore, the AFE control unit includes a sampling module and a balancing drive module; the sampling module is used to collect power battery cell data; the balancing drive module is used to control the opening or closing of the battery balancing function according to the battery balancing control instruction sent by the cloud data platform.

[0016] Furthermore, the cloud data platform includes a data governance module, a data warehouse, a cloud balanced startup module, and a balanced heating startup module;

[0017] The data management module is used to manage the cell data sent by the vehicle-side controller and mark the data;

[0018] The marked data is stored in the data warehouse, and the data in the data warehouse flows into the cloud-based balanced start-up module and balanced heating start-up module in real time;

[0019] The cloud-based balancing start module obtains the power battery consistency status in real time according to the data sent by the data warehouse. When a battery consistency failure occurs, it determines the power battery cell balancing status. When it determines that the cell needs to be supplemented with balancing control, it sends a battery balancing start instruction and corresponding control commands to the vehicle-side controller;

[0020] After receiving the preheating request signal sent by the application end, the balanced heating start module determines whether the vehicle meets the balanced heating conditions through the data sent by the data warehouse. When the balanced heating conditions are met, a balanced heating function start instruction is sent to the vehicle-side controller.

[0021] Furthermore, the working process of the cloud-based balanced startup module is as follows:

[0022] S1. Filter the data sent from the data warehouse for level 2 battery consistency poor fault setting vehicle and fault reporting data;

[0023] S2. Determine the SOC value of each cell in the battery in turn to determine whether the composite balancing starts at the SOC threshold:

[0024] Record the difference between the SOCi of the cell number i and the minimum SOCmin. If SOCi-SOCmin≥SOCo, SOCo is the SOC threshold for equalization, then execute step S3; otherwise, the process ends.

[0025] S3 records all cells {SOCi} that meet the balanced opening SOC threshold, and records the number of cells n that meet the balanced opening SOC threshold;

[0026] S4. If the number of cells that meet the balanced SOC threshold is n = N, where N is the number of balanced cells with balanced capacity in the battery, the process ends, otherwise, step S5 is executed;

[0027] S5. Retrieve the average temperature Ti, average voltage Vi, and average health SOHi of three consecutive frames corresponding to the cell number i of SOCi;

[0028] S6. If the battery cell satisfies the following three conditions at the same time, execute step S7, otherwise the process ends:

[0029] 1) Tmin≤Ti≤Tmax; Tmin and Tmax represent the minimum temperature and maximum temperature that meet the equilibrium judgment respectively;

[0030] 2) Vi≤Vmin∪Vmax≤Vi; Vmin and Vmax represent the minimum voltage and maximum voltage that meet the equilibrium judgment respectively;

[0031] 3) SOHmin≤SOHi; SOHmin represents the minimum temperature SOH that satisfies the equilibrium judgment;

[0032] S7. Whether the battery cell has triggered SOC correction within a cumulative three charge and discharge cycles of the rated capacity C, if so, execute steps S9 to S11; otherwise, execute step S8;

[0033] S8. Record the vehicle and the cell number i that needs to be balanced, and then execute step S2 after receiving the SOC correction mark;

[0034] S9. If the OCV correction is triggered and Ti ≥ 10°C, set the equalization capacity Cn = SOCi-SOCmin-0.5%, Cn∈[0,10%C], and execute step S13; otherwise, execute step S12;

[0035] S10. If the pseudo-static correction is triggered, and Ti ≥ 10°C, and the remaining balancing capacity ≤ 1Ah, then set the balancing capacity Cn = SOCi-SOCmin-1%, Cn∈[0,5%C], and execute step S13; otherwise, execute step S12;

[0036] S11. If the overcharge correction is triggered, and Ti ≥ 10 ° C, and the remaining balancing capacity ≤ 0.5 Ah, then set the balancing capacity Cn = SOCi-SOCmin-1%, Cn∈[0,5%C], and execute step S13; otherwise, execute step S12;

[0037] S12. Record the flag to be balanced and re-judge the next time the BMS initialization is completed;

[0038] S13. Send the battery balancing start command, balancing mode command and balancing target capacity Cn to the vehicle-side controller.

[0039] Furthermore, the working process of the balanced heating startup module is as follows:

[0040] S1. The model imports the current data of the vehicle;

[0041] S2. If the following conditions are met at the same time, a balanced heating function start instruction is sent to the vehicle end; otherwise, balanced heating is prohibited:

[0042] 1) Balanced cumulative capacity Ca ≥ Cp;

[0043] 2) Current balance flag = 0;

[0044] 3) The heating film system has no faults;

[0045] 4)Tmin≥0℃.

[0046] Furthermore, the application end is an application running on a mobile terminal or a vehicle computer.

[0047] The present invention has the following advantages:

[0048] The purpose of the present invention is to provide a power battery balancing module heating system based on cloud computing, which combines cloud data and supplements the vehicle-side balancing capacity through cloud computing to improve the balancing degree and accuracy of the whole vehicle. At the same time, the balancing energy is used to power the power battery heating system. When the vehicle has a preheating requirement, such as starting a cold car, heating while charging, etc., when the output capacity of the low-temperature or low-SOC power battery is insufficient, it is powered by an independent power storage module, saving power battery power loss and enabling more power output to be provided for the whole vehicle, improving user experience, and also helping to reduce battery life loss. At present, there is no precedent in the industry for using the energy accumulated by the balancing module for the power battery heating function. Most of them will dissipate the balancing capacity through passive balancing. At the same time, cloud model applications are becoming more and more common, but there are few cases of achieving balancing through cloud algorithms. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without creative work.

[0050] Figure 1 This is a block diagram of the composition principle of a power battery balancing module heating system based on cloud computing according to an embodiment of the present invention;

[0051] Figure 2 This is a functional block diagram of the BMS described in an embodiment of the present invention;

[0052] Figure 3 This is a working diagram of the cloud-based balanced startup module described in an embodiment of the present invention;

[0053] Figure 4 This is a working diagram of the cloud-based balanced heating startup module described in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example

[0056] This embodiment is a power battery balancing module heating system based on cloud computing. Figure 1As shown, it includes vehicle-side controller, application-side and cloud data platform;

[0057] The vehicle-side controller includes a BMS and a T-BOX. The BMS sends the battery cell data to the cloud data platform through the T-BOX, and receives instructions from the cloud data platform through the T-BOX.

[0058] The application end is used to send a preheating request instruction to the cloud data platform;

[0059] The cloud data platform receives the battery cell data sent by the vehicle-side controller in real time and processes the data; when a battery consistency fault signal is received, it determines whether battery balancing control of the power battery is required through the battery cell data, and sends corresponding control instructions to the vehicle-side controller; when a preheating request signal sent by the application end is received, it determines whether the balanced heating conditions are met through the vehicle-side data, and sends corresponding control instructions to the vehicle-side controller.

[0060] Furthermore, in this embodiment, the application end is an application running on a mobile terminal or a vehicle computer.

[0061] Furthermore, the BMS includes an energy storage module and an AFE control unit, such as Figure 2 As shown, the AFE control unit is used to collect power battery cell data, and to turn on or off battery balancing after receiving the battery balancing control command from the cloud data platform; all the energy balanced out of the power battery, except for a small part dissipated by the balancing resistor, is mostly used to charge the energy storage module; when the BMS receives the balanced heating control command from the cloud data platform, the energy storage module provides heat for the heating film system. In this embodiment, the energy storage module is not the only energy source for the heating film system. When the BMS does not receive the balanced heating control command sent by the cloud data platform, the heating film is still powered by the high-voltage system of the vehicle.

[0062] Furthermore, the AFE control unit includes a sampling module and a balancing drive module; the sampling module is used to collect power battery cell data; the balancing drive module is used to control the opening or closing of the battery balancing function according to the battery balancing control instruction sent by the cloud data platform.

[0063] Furthermore, the cloud data platform includes a data governance module, a data warehouse, a cloud balanced startup module, and a balanced heating startup module;

[0064] The data management module is used to manage the cell data sent by the vehicle-side controller and mark the data;

[0065] The marked data is stored in the data warehouse, and the data in the data warehouse flows into the cloud-based balanced start-up module and balanced heating start-up module in real time;

[0066] The cloud-based balancing start module obtains the power battery consistency status in real time according to the data sent by the data warehouse. When a battery consistency failure occurs, it determines the power battery cell balancing status. When it determines that the cell needs to be supplemented with balancing control, it sends a battery balancing start instruction and corresponding control commands to the vehicle-side controller;

[0067] After receiving the preheating request signal sent by the application end, the balanced heating start module determines whether the vehicle meets the balanced heating conditions through the data sent by the data warehouse. When the balanced heating conditions are met, a balanced heating function start instruction is sent to the vehicle-side controller.

[0068] Furthermore, the working process of the cloud-based balanced startup module is as follows: Figure 3 As shown:

[0069] S1. Filter the data sent from the data warehouse for level 2 battery consistency poor fault setting vehicles and 3 consecutive frames of fault reporting data;

[0070] S2. Determine the SOC value of each cell in the battery in turn to determine whether the composite balancing starts at the SOC threshold:

[0071] Record the difference between the SOCi of the cell number i and the minimum SOCmin. If SOCi-SOCmin≥SOCo, SOCo is the SOC threshold for equalization start, then execute step S3; otherwise, the process ends.

[0072] S3. Record all cells {SOCi} that meet the balanced start SOC threshold, and record the number n of cells that meet the balanced start SOC threshold.

[0073] S4. If the number of cells that meet the equalization start SOC threshold n=N, where N is the number of equalization cells with equalized capacity in the battery, the process ends, otherwise, execute step S5.

[0074] S5. Retrieve the average temperature Ti, average voltage Vi, and average health SOHi of the battery cell number i corresponding to SOCi for three consecutive frames.

[0075] S6. Determine whether the battery cell meets the following conditions at the same time:

[0076] 1) Tmin≤Ti≤Tmax; Tmin and Tmax represent the minimum temperature and maximum temperature that meet the equilibrium judgment respectively;

[0077] 2) Vi≤Vmin∪Vmax≤Vi; Vmin and Vmax represent the minimum voltage and maximum voltage that meet the equilibrium judgment respectively;

[0078] 3) SOHmin≤SOHi; SOHmin represents the minimum temperature SOH that satisfies the equilibrium judgment;

[0079] If the battery cell satisfies the above three conditions at the same time, step S7 is executed, otherwise the process ends.

[0080] S7. Whether the battery cell has triggered SOC correction within a cumulative three charge and discharge cycles of the rated capacity C, if so, execute steps S9 to S11; otherwise, execute step S8;

[0081] S8. Record the vehicle and the cell number i that needs to be balanced, and then execute step S2 after receiving the SOC correction mark;

[0082] S9. If the OCV correction is triggered and Ti ≥ 10°C, set the equalization capacity Cn = SOCi-SOCmin-0.5%, Cn∈[0,10%C], and execute step S13; otherwise, execute step S12;

[0083] S10. If the pseudo-static correction is triggered, and Ti ≥ 10°C, and the remaining balancing capacity ≤ 1Ah, then set the balancing capacity Cn = SOCi-SOCmin-1%, Cn∈[0,5%C], and execute step S13; otherwise, execute step S12;

[0084] S11. If the overcharge correction is triggered, and Ti ≥ 10 ° C, and the remaining balancing capacity ≤ 0.5 Ah, then set the balancing capacity Cn = SOCi-SOCmin-1%, Cn∈[0,5%C], and execute step S13; otherwise, execute step S12;

[0085] S12. Record the flag to be balanced and make a new judgment next time the BMS initialization completion flag is set.

[0086] S13. Send the battery balancing start command, balancing mode command and balancing target capacity Cn to the vehicle-side controller.

[0087] After the vehicle-side controller receives the battery balancing start command, it updates the balancing capacity according to Cn, and the vehicle-side BMS determines the exit balancing condition based on the vehicle condition.

[0088] Furthermore, the working process of the balanced heating startup module is as follows: Figure 4 As shown:

[0089] Upon receiving the preheating request sent by the application end, determine whether to send a balanced heating function start instruction to the vehicle end according to the following method:

[0090] S1. The model imports the current data of the vehicle;

[0091] S2. If the following conditions are met at the same time, a balanced heating function start instruction is sent to the vehicle end; otherwise, balanced heating is prohibited:

[0092] 1) Balanced cumulative capacity Ca ≥ Cp;

[0093] 2) Current balance flag = 0;

[0094] 3) The heating film system has no faults;

[0095] 4)Tmin≥0℃.

[0096] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power battery equalization module heating system based on cloud computing, characterized in that: Including vehicle-side controller, application-side and cloud data platform; The vehicle-side controller includes a BMS and a T-BOX. The BMS sends the battery cell data to the cloud data platform through the T-BOX, and receives instructions from the cloud data platform through the T-BOX. The application end is used to send a preheating request instruction to the cloud data platform; The cloud data platform receives the battery cell data sent by the vehicle-side controller in real time and processes the data; when a battery consistency fault signal is received, it determines whether battery balancing control of the power battery is required through the battery cell data, and sends corresponding control instructions to the vehicle-side controller; when a preheating request signal sent by the application end is received, it determines whether the balanced heating conditions are met through the vehicle-side data, and sends corresponding control instructions to the vehicle-side controller.

2. A power battery balancing module heating system based on cloud computing as claimed in claim 1, characterized in that: The BMS includes an energy storage module and an AFE control unit; the AFE control unit is used to collect power battery cell data and turn on or off battery balancing after receiving a battery balancing control instruction from the cloud data platform; the energy balanced by the power battery is used to charge the energy storage module; when the BMS receives a balanced heating control instruction from the cloud data platform, the energy storage module provides heat for the heating film system.

3. A power battery balancing module heating system based on cloud computing as claimed in claim 2, characterized in that: The energy storage module is not the only energy source for the heating film system. When the BMS does not receive the balanced heating control instruction sent by the cloud data platform, the heating film is still powered by the vehicle's high-voltage system.

4. A power battery balancing module heating system based on cloud computing as claimed in claim 2, characterized in that: The AFE control unit includes a sampling module and a balancing drive module; the sampling module is used to collect power battery cell data; the balancing drive module is used to control the opening or closing of the battery balancing function according to the battery balancing control instruction sent by the cloud data platform.

5. The power battery balancing module heating system based on cloud computing according to claim 1, characterized in that: The cloud data platform includes a data management module, a data warehouse, a cloud balanced startup module and a balanced heating startup module; The data management module is used to manage the cell data sent by the vehicle-side controller and mark the data; The marked data is stored in the data warehouse, and the data in the data warehouse flows into the cloud-based balanced start-up module and balanced heating start-up module in real time; The cloud-based balancing start module obtains the power battery consistency status in real time according to the data sent by the data warehouse. When a battery consistency failure occurs, it determines the power battery cell balancing status. When it determines that the cell needs to be supplemented with balancing control, it sends a battery balancing start instruction and corresponding control commands to the vehicle-side controller; After receiving the preheating request signal sent by the application end, the balanced heating start module determines whether the vehicle meets the balanced heating conditions through the data sent by the data warehouse. When the balanced heating conditions are met, a balanced heating function start instruction is sent to the vehicle-side controller.

6. A power battery balancing module heating system based on cloud computing as claimed in claim 5, characterized in that: The working process of the cloud-based balanced startup module is as follows: S1. Filter the data sent from the data warehouse for level 2 battery consistency poor fault setting vehicle and fault reporting data; S2. Determine the SOC value of each cell in the battery in turn to determine whether the composite balancing starts at the SOC threshold: Record the difference between the SOCi of the cell number i and the minimum SOCmin. If SOCi-SOCmin≥SOCo, SOCo is the SOC threshold for equalization, then execute step S3; otherwise, the process ends. S3 records all cells {SOCi} that meet the balanced opening SOC threshold, and records the number of cells n that meet the balanced opening SOC threshold; S4. If the number of cells that meet the balanced SOC threshold is n = N, where N is the number of balanced cells with balanced capacity in the battery, the process ends, otherwise, step S5 is executed; S5. Retrieve the average temperature Ti, average voltage Vi, and average health SOHi of three consecutive frames corresponding to the cell number i of SOCi; S6. If the battery cell satisfies the following three conditions at the same time, execute step S7, otherwise the process ends: 1) Tmin≤Ti≤Tmax; Tmin and Tmax represent the minimum temperature and maximum temperature that meet the equilibrium judgment respectively; 2) Vi≤Vmin∪Vmax≤Vi; Vmin and Vmax represent the minimum voltage and maximum voltage that meet the equilibrium judgment respectively; 3) SOHmin≤SOHi; SOHmin represents the minimum temperature SOH that satisfies the equilibrium judgment; S7. Whether the battery cell has triggered SOC correction within a cumulative three charge and discharge cycles of the rated capacity C, if so, execute steps S9 to S11; Otherwise, execute step S8; S8. Record the vehicle and the cell number i that needs to be balanced, and then execute step S2 after receiving the SOC correction mark; S9. If the OCV correction is triggered and Ti ≥ 10°C, set the equalization capacity Cn = SOCi-SOCmin-0.5%, Cn∈[0,10%C], and execute step S13; Otherwise, execute step S12; S10. If the pseudo-static correction is triggered, and Ti ≥ 10°C, and the remaining balancing capacity ≤ 1Ah, then set the balancing capacity Cn = SOCi-SOCmin-1%, Cn∈[0,5%C], and execute step S13; Otherwise, execute step S12; S11. If the overcharge correction is triggered, and Ti ≥ 10 ° C, and the remaining balancing capacity ≤ 0.5 Ah, then set the balancing capacity Cn = SOCi-SOCmin-1%, Cn∈[0,5%C], and execute step S13; otherwise, execute step S12; S12. Record the flag to be balanced and re-judge the next time the BMS initialization is completed; S13. Send the battery balancing start command, balancing mode command and balancing target capacity Cn to the vehicle-side controller.

7. A power battery balancing module heating system based on cloud computing as claimed in claim 5, characterized in that: The working process of the balanced heating startup module is as follows: S1. The model imports the current data of the vehicle; S2. If the following conditions are met at the same time, a balanced heating function start instruction is sent to the vehicle end; otherwise, balanced heating is prohibited: 1) Balanced cumulative capacity Ca ≥ Cp; 2) Current balance flag = 0; 3) The heating film system has no faults; 4)Tmin≥0℃.

8. The power battery balancing module heating system based on cloud computing according to claim 1, characterized in that: The application end is an application running on a mobile terminal or a vehicle computer.

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