Vehicle battery equalization processing method and device and vehicle

Abstract

The invention discloses a vehicle battery equalization processing method and device and a vehicle, and relates to the technical field of secondary batteries. The equalization processing method for the vehicle battery comprises the following steps: monitoring the vehicle battery in real time; under the condition that the monitoring result indicates that the standing duration of the vehicle battery and the battery condition of the vehicle battery meet the balance triggering condition, determining a plurality of target battery cells to be processed in the vehicle battery according to the monitoring result; and for each target battery cell, carrying out charging equalization processing or discharging equalization processing on the target battery cell according to the battery cell capacity of the target battery cell and the current first residual electric quantity included in the monitoring result. According to the embodiment, the service life of the vehicle battery can be prolonged, and the use cost of the electric vehicle is reduced. In addition, by considering the battery cell capacity of the battery cells, the battery cells can be accurately subjected to equalization control, so that the equalization effect of the vehicle battery is better.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and in particular to a method and device for equalizing vehicle batteries, and a vehicle. Background Art

[0002] For new energy vehicles, the vehicle battery is the primary power source. Generally, a vehicle battery consists of multiple cells, along with protective circuitry and a housing. After prolonged use, the individual cells within a vehicle battery will age to varying degrees, leading to variations in parameters such as the cell's internal resistance. This can lead to problems such as insufficient state of charge (SOC) in individual cells, overcharging, or over-discharging. This negatively impacts the battery's service life, increases the cost of using new energy vehicles, and compromises the user experience. Summary of the Invention

[0003] In light of this, embodiments of the present invention provide a vehicle battery balancing method, device, and vehicle. By balancing the cells in a vehicle battery, the battery life of the vehicle can be extended, the cost of using new energy vehicles can be reduced, and the user experience of driving new energy vehicles can be improved. In addition, by considering the cell capacity, the cells can be precisely balanced, resulting in better balancing results for the vehicle battery.

[0004] To achieve the above objectives, according to one aspect of an embodiment of the present invention, a vehicle battery equalization processing method is provided, which is applied to a battery management system, comprising:

[0005] Real-time monitoring of vehicle batteries;

[0006] When the monitoring result indicates that the rest time of the vehicle battery and the battery condition of the vehicle battery meet the equalization trigger condition, a plurality of target cells to be processed in the vehicle battery are determined according to the monitoring result, the plurality of target cells including at least one cell to be discharged and at least one cell to be charged;

[0007] For each target battery cell, a charge balancing process or a discharge balancing process is performed on the target battery cell according to the battery cell capacity and the current first remaining power of the target battery cell included in the monitoring result.

[0008] Optionally, performing charge balancing or discharge balancing on the target battery cell according to the battery cell capacity and the current first remaining power of the target battery cell included in the monitoring result includes:

[0009] Calculating a second remaining power after equalization corresponding to the target battery cell according to the battery cell capacity and the first remaining power of the target battery cell included in the monitoring result;

[0010] When the target cell is a cell to be discharged, a discharge balancing process is performed on the cell to be discharged based on the second remaining power;

[0011] When the target cell is a cell to be charged, charge balancing is performed on the cell to be charged based on the second remaining power.

[0012] Optionally, performing charge balancing or discharge balancing on the target cell includes:

[0013] Determining a balancing time according to the cell capacity of the target cell, the first remaining power, the second remaining power, and the balancing current;

[0014] The target cell is controlled to be electrically connected to the transformer device, and the power transfer between the target cell and the transformer device is controlled within the balancing time to achieve charge balancing or discharge balancing of the target cell.

[0015] Optionally, determining the balancing time according to the cell capacity, the first remaining capacity, the second remaining capacity, and the balancing current of the target cell includes:

[0016] For the target cell being the i-th cell to be discharged, the balancing current is the discharge current corresponding to the i-th cell to be discharged, and the balancing time of the i-th cell to be discharged is calculated using the following formula:

[0017] T 放i =(Cap 放i ×(SOC 放i -SOCT 放i )) / I 放i

[0018] T 放i is the equilibrium time corresponding to the i-th cell to be discharged, Cap 放i is the cell capacity of the i-th cell to be discharged, I 放i is the discharge current corresponding to the i-th cell to be discharged, SOC 放i is the first remaining capacity of the i-th cell to be discharged, SOCT 放i is the second remaining capacity corresponding to the i-th battery cell to be discharged.

[0019] Optionally, determining the balancing time according to the cell capacity, the first remaining capacity, the second remaining capacity, and the balancing current of the target cell includes:

[0020] For example, if the target cell is the jth cell to be charged and the balancing current is the charging current corresponding to the jth cell to be charged, the balancing time of the jth cell to be charged is calculated using the following formula:

[0021] T 充j =(Cap 充j ×(SOCT 充j-SOC 充j )) / I 充j

[0022] T 充j is the balancing time corresponding to the jth cell to be charged, Cap 充j is the capacity of the jth cell to be charged, I 充j is the charging current corresponding to the jth cell to be charged, SOC 充j is the first remaining capacity corresponding to the jth cell to be charged, SOCT 充j is the second remaining power corresponding to the j-th battery cell to be charged.

[0023] Optionally, performing charge balancing or discharge balancing on the target cell includes:

[0024] When the target battery cell is a battery cell to be discharged, the battery cell to be discharged is controlled to provide power to the transformer device until it is detected that the remaining power of the battery cell to be discharged is not higher than a second remaining power corresponding to the battery cell to be discharged;

[0025] When the target cell is a cell to be charged, the transformer device is controlled to charge the cell to be charged until it is detected that the remaining power of the cell to be charged is not less than the second remaining power corresponding to the cell to be charged.

[0026] Optionally, the balancing triggering condition includes: the vehicle battery has been at rest for a period of time greater than a time threshold, and the absolute value of the difference between the voltage of any cell in the vehicle battery and the voltage average is greater than a first difference threshold; wherein the voltage average is the average value of the voltages of all cells in the vehicle battery;

[0027] or,

[0028] The vehicle battery has been stationary for longer than a time threshold, and the absolute value of the difference between the current first remaining power of any battery cell in the vehicle battery and the average remaining power is greater than a second difference threshold; wherein the average remaining power is the average of the current first remaining power of all battery cells in the vehicle battery.

[0029] Optionally, the step of real-time monitoring of the vehicle battery is performed in at least one of the following scenarios:

[0030] The duration that the vehicle has not been started exceeds the preset vehicle static duration threshold, the installation duration of the vehicle battery exceeds the preset battery installation duration threshold, it is detected that the usage duration of the vehicle battery is less than the preset battery usage duration threshold, or an equalization processing instruction for the vehicle battery is received, etc.

[0031] To achieve the above objectives, according to another aspect of an embodiment of the present invention, a vehicle battery equalization processing device is provided, which is applied to a battery management system, including:

[0032] Battery detection module, used to monitor vehicle batteries in real time;

[0033] a cell determination module, configured to determine, when the monitoring results indicate that the vehicle battery's rest time and the vehicle battery's battery condition satisfy a balancing trigger condition, a plurality of target cells to be processed in the vehicle battery based on the monitoring results, the plurality of target cells including at least one cell to be discharged and at least one cell to be charged;

[0034] The balancing processing module is used to perform charge balancing processing or discharge balancing processing on each target battery cell according to the battery capacity of the target battery cell and the current first remaining power included in the monitoring result.

[0035] To achieve the above object, according to another aspect of an embodiment of the present invention, a vehicle is provided, wherein the vehicle is equipped with the above battery management system.

[0036] To achieve the above object, according to another aspect of an embodiment of the present invention, there is provided an electronic device, comprising:

[0037] one or more processors;

[0038] a storage device for storing one or more programs,

[0039] When one or more programs are executed by one or more processors, the one or more processors implement the above-mentioned battery balancing method.

[0040] To achieve the above object, according to another aspect of an embodiment of the present invention, a computer-readable medium is provided, on which a computer program is stored. When the program is executed by a processor, the above battery balancing method is implemented.

[0041] One embodiment of the above invention has the following advantages or beneficial effects: when the battery condition of a vehicle battery satisfies a balancing trigger condition, multiple target cells to be processed in the vehicle battery are determined. Based on the cell capacity of the target cells and the current first remaining power, the target cells are charged and discharged, thereby increasing the service life of the vehicle battery, reducing the cost of using new energy vehicles, and improving the user's driving experience of new energy vehicles. In addition, by considering the cell capacity of the target cells in the vehicle battery, the target cells can be accurately balanced, resulting in a better balancing effect for the vehicle battery.

[0042] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are provided for a better understanding of the present invention and are not intended to limit the present invention.

[0044] Figure 1 1 is a flow chart of a vehicle battery equalization method according to an embodiment of the present invention;

[0045] Figure 2 is a flow chart of a vehicle battery equalization method according to another embodiment of the present invention;

[0046] Figure 3 is a flow chart of a vehicle battery equalization method according to another embodiment of the present invention;

[0047] Figure 4a is a schematic diagram of a battery condition of a vehicle battery before equalization according to one embodiment of the present invention;

[0048] Figure 4b is a schematic diagram of a battery status of a vehicle battery after equalization according to one embodiment of the present invention;

[0049] Figure 5 is a schematic diagram of main modules of a vehicle battery equalization processing device provided according to one embodiment of the present invention;

[0050] Figure 6 It is a structural diagram of a computer system suitable for implementing the vehicle battery equalization processing method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0052] It should be pointed out that, in the absence of conflict, the embodiments of the present invention and the technical features therein may be combined with each other.

[0053] It should be pointed out that the acquisition, storage, use, and processing of data in the technical solutions of the embodiments of the present invention comply with the relevant provisions of national laws and regulations.

[0054] Figure 1 FIG. 1 is a flow chart of a vehicle battery equalization method according to an embodiment of the present invention. The method includes the following steps S101 to S103:

[0055] Step S101: monitor the vehicle battery in real time.

[0056] A vehicle battery is installed in a vehicle. The vehicle battery provides energy for the vehicle. The vehicle battery balancing method provided by embodiments of the present invention can be executed in the following scenarios: the duration of the vehicle being inactive exceeds a preset vehicle stationary duration threshold, the duration of the vehicle battery being installed exceeds a preset battery installation duration threshold, the vehicle battery usage duration is detected to be less than a preset battery usage duration threshold, or a vehicle battery balancing instruction is received.

[0057] Step S102 : when the monitoring result indicates that the rest time of the vehicle battery and the battery condition of the vehicle battery meet the equalization triggering condition, a plurality of target cells to be processed in the vehicle battery are determined according to the monitoring result.

[0058] Equalization trigger conditions can be set based on specific needs. These conditions may include: the absolute difference between the voltage of any cell in the vehicle battery and the average voltage is greater than a first difference threshold; the difference between the current State of Charge (SOC) of any cell in the vehicle battery and the average SOC is greater than a second difference threshold. The average voltage is the average voltage of all cells in the vehicle battery. The average SOC is the average SOC of all cells in the battery.

[0059] The balancing trigger conditions include: the vehicle battery has been at rest for longer than a time threshold, and the absolute value of the difference between the voltage of any battery cell in the vehicle battery and the voltage average value is greater than a first difference threshold; the vehicle battery has been at rest for longer than a time threshold, and the absolute value of the difference between the current first remaining power of any battery cell in the vehicle battery and the remaining power average value is greater than a second difference threshold; wherein the remaining power average value is the average value of the current first remaining power of all battery cells in the vehicle battery.

[0060] The multiple target cells include at least one cell to be discharged and at least one cell to be charged. For example, the cell with the highest remaining charge or the highest voltage in the vehicle battery is determined to be the cell to be discharged. The cell with the lowest remaining charge or the lowest voltage in the vehicle battery is determined to be the cell to be charged.

[0061] For another example, multiple cells in the vehicle battery whose current first remaining power is greater than a first power threshold are determined as cells to be discharged, and multiple cells in the vehicle battery whose current first remaining power is less than a second power threshold are determined as cells to be charged, etc.

[0062] Step S103 : For each target battery cell, a charge balancing process or a discharge balancing process is performed on the target battery cell according to the battery cell capacity and the current first remaining power of the target battery cell included in the monitoring result.

[0063] If the target cell is a cell to be discharged, the cell to be discharged is controlled to provide power to the transformer. If the target cell is a cell to be charged, the transformer is controlled to charge the cell to be charged, so as to complete charge balancing or discharge balancing for the target cell.

[0064] In the solution of the embodiment of the present invention, when the vehicle battery meets the balancing trigger condition, the target cell is charged or discharged based on the target cell's cell capacity and the current first remaining power included in the monitoring results. This can extend the battery life and reduce the maintenance and use costs of the electric vehicle. In addition, by considering the cell capacity of the target cell in the vehicle battery, the target cell can be accurately balanced, resulting in a better balancing effect for the vehicle battery.

[0065] Figure 2 FIG2 is a flow chart of a vehicle battery equalization method according to another embodiment of the present invention. The method includes the following steps S202 to S205:

[0066] Step S201: monitor the vehicle battery in real time.

[0067] Step S202, when the monitoring results indicate that the vehicle battery's rest time and the vehicle battery's battery condition meet the equalization triggering condition, determine multiple target battery cells to be processed in the vehicle battery based on the monitoring results; wherein the multiple target battery cells include at least one battery cell to be discharged and at least one battery cell to be charged.

[0068] Step S203 , calculating a second remaining capacity after equalization corresponding to the target battery cell according to the battery cell capacity and the first remaining capacity of the target battery cell included in the monitoring result.

[0069] The second target power is the expected remaining power of the target cell after balancing. The cell capacity of the target cell and the first remaining power are input into a power calculation model. Based on the output of the power calculation model, the second remaining power corresponding to the target cell is determined.

[0070] The following power calculation model can be used to obtain the second target power corresponding to each battery cell to be discharged and each battery cell to be charged. The vehicle battery includes m batteries to be discharged and n batteries to be charged. Both m and n are positive integers, and m ≥ 1 and n ≥ 1.

[0071]

[0072] Among them, Cap 放i SOC is the cell capacity of the i-th cell to be discharged, 1≤i≤m. 放i is the first remaining capacity of the i-th cell to be discharged, SOCT 放i is the second remaining capacity corresponding to the i-th battery cell to be discharged.

[0073] Cap 充j SOC is the capacity of the jth cell to be charged, 1≤j≤n. 充j is the first remaining capacity corresponding to the jth cell to be charged, SOCT 充j is the second remaining power corresponding to the j-th battery cell to be charged.

[0074] Formula (1) defines the relationship between the cell capacity of the cell to be discharged, the second remaining power corresponding to the cell to be discharged, the cell capacity of the cell to be charged, and the first remaining power corresponding to the cell to be charged. Formula (2) indicates that the power output of all cells to be discharged is equal to the power input of all cells to be charged.

[0075] Using the above-mentioned power calculation model, multiple sets of solutions can be obtained. Based on this, a preferred embodiment is proposed below. In this preferred implementation, the second target power corresponding to all cells to be discharged is equal, and the second target power corresponding to all cells to be charged is equal. Through the above-mentioned limiting conditions and the above-mentioned power calculation model, a unique solution for the second target power corresponding to each cell to be discharged and each cell to be charged can be obtained. Using the obtained second target power corresponding to each cell to be discharged and each cell to be charged, charge and discharge balancing processing is performed on each cell to be discharged and each cell to be charged, achieving a better balancing optimization effect.

[0076] Step S204 : when the target cell is a cell to be discharged, a discharge balancing process is performed on the cell to be discharged based on the second remaining power.

[0077] Step S205 : when the target cell is a cell to be charged, charging balancing is performed on the cell to be charged based on the second remaining power.

[0078] Equalization is performed on each cell to be discharged and each cell to be charged, transferring the charge from the cell to be discharged to the cell to be charged. After equalization, the SOC of the cell to be discharged is equal to the second target charge corresponding to the cell to be discharged, and the SOC of the cell to be charged is equal to the second target charge corresponding to the cell to be charged. After equalization, the remaining charge in both the cell to be discharged and the cell to be charged is in a balanced state.

[0079] In one embodiment of the present invention, charge balancing or discharge balancing is performed on a target battery cell, including: determining a balancing time according to the battery capacity, the first remaining power, the second remaining power, and the balancing current of the target battery cell; controlling the target battery cell to be electrically connected to a transformer device, and controlling the power transfer between the target battery cell and the transformer device within the balancing time to achieve charge balancing or discharge balancing of the target battery cell.

[0080] Specifically, the target cell is the i-th cell to be discharged, the balancing current is the discharge current corresponding to the i-th cell to be discharged, and the balancing time of the i-th cell to be discharged is calculated using the following formula (3):

[0081] T 放i =(Cap 放i ×(SOC 放i -SOCT 放i )) / I 放i (3)

[0082] Among them, T 放i is the equilibrium time corresponding to the i-th cell to be discharged, Cap 放i is the cell capacity of the i-th cell to be discharged, I 放i is the discharge current corresponding to the i-th cell to be discharged.

[0083] For each battery cell to be discharged, within the balancing time of the battery cell to be discharged, the battery cell to be discharged is controlled to provide power to the transformer device, so as to transfer part of the power in the battery cell to be discharged to the transformer device.

[0084] For the target cell being the jth cell to be charged, the balancing current is the charging current corresponding to the jth cell to be charged, and the balancing time of the jth cell to be charged is calculated using the following formula (5):

[0085] T 充j =(Cap 充j ×(SOCT 充j -SOC 充j )) / I 充j (4)

[0086] Among them, T 充j is the balancing time corresponding to the jth cell to be charged, Cap 充j is the capacity of the jth cell to be charged, I 充j is the charging current corresponding to the jth cell to be charged.

[0087] For each battery cell to be charged, within the balancing time of the battery cell to be charged, the transformer device is controlled to charge the battery cell to be charged, so as to transfer part of the electricity in the transformer device to the battery cell to be charged.

[0088] Figure 3 FIG. 1 is a flow chart of a vehicle battery equalization method according to another embodiment of the present invention. The method includes the following steps S301 to S305:

[0089] Step S301: monitor the vehicle battery in real time.

[0090] Step S302, when the monitoring results indicate that the vehicle battery's rest time and the vehicle battery's battery condition meet the equalization triggering condition, determine multiple target battery cells to be processed in the vehicle battery based on the monitoring results; wherein the multiple target battery cells include at least one battery cell to be discharged and at least one battery cell to be charged.

[0091] Step S303 , calculating a second remaining capacity after equalization corresponding to the target battery cell according to the battery cell capacity and the first remaining capacity of the target battery cell included in the monitoring result.

[0092] Step S304 : when the target cell is a cell to be discharged, controlling the cell to be discharged to provide power to the transformer device until it is detected that the remaining power of the cell to be discharged is not higher than the corresponding second remaining power of the cell to be discharged.

[0093] The battery cells to be discharged are controlled to supply power to the transformer equipment, so that the power in the battery cells to be discharged is transferred to the transformer equipment. During the process of controlling the battery cells to be discharged to supply power to the transformer equipment, the remaining power in the battery cells to be discharged gradually decreases. While controlling the battery cells to be discharged to supply power to the transformer equipment, the remaining power in the battery cells to be discharged is detected. Once it is detected that the remaining power in the battery cells to be discharged is not greater than a second remaining power corresponding to the battery cells to be discharged, the battery cells to be discharged are stopped from supplying power to the transformer equipment.

[0094] Step S305 : when the target cell is a cell to be charged, controlling the transformer device to charge the cell to be charged until it is detected that the remaining power of the cell to be charged is not less than a second remaining power corresponding to the cell to be charged.

[0095] The transformer device is controlled to charge the battery cell to be charged, transferring power from the transformer device to the battery cell to be charged. During the process of controlling the transformer device to charge the battery cell to be charged, the remaining power in the battery cell to be charged gradually increases. While controlling the transformer device to charge the battery cell to be charged, the remaining power in the battery cell to be charged is detected. Once it is detected that the remaining power in the battery cell to be charged is not less than a second target power level corresponding to the battery cell to be charged, the transformer device is stopped from charging the battery cell to be charged.

[0096] In the solution of the embodiment of the present invention, while performing charge balancing or discharge balancing on the target cell, the remaining power of the target cell is monitored. Once it is detected that the remaining power of the target cell reaches the second target power corresponding to the target cell, the charge balancing or discharge balancing process on the target cell is stopped. The solution of the embodiment of the present invention can quickly achieve a balanced state for each target cell in the battery.

[0097] Figure 4a FIG. 1 is a schematic diagram of the battery status of a vehicle battery before equalization according to an embodiment of the present invention. Figure 4aAs shown, the vehicle battery includes cells A1, A2, A3, A4, and A5. The dotted lines on the cells represent the current first residual current of the cells. As can be seen, after a period of use, the current first residual capacity of each cell is uneven.

[0098] Using the solution of the embodiment of the present invention, based on the monitoring results of the vehicle battery, cells A1 and A3 are determined to be cells to be discharged, and cells A2 and A5 are determined to be cells to be charged. Then, the second residual current after equalization corresponding to cells A1, A3, A2, and A5 is determined respectively.

[0099] The arrowed line between the battery cell and the transformer equipment TE indicates the direction of current flow. The transformer equipment TE can be located inside or outside the battery. Cell A1 is controlled to supply power to the transformer equipment TE until it detects that the remaining power in cell A1 is no greater than the second remaining power level corresponding to cell A1. Cell A3 is controlled to supply power to the transformer equipment TE until it detects that the remaining power in cell A3 is no greater than the second remaining power level corresponding to cell A3.

[0100] It should be noted that the process of the battery cells A1 and A3 providing power to the transformer device TE may be performed in series or in parallel.

[0101] The transformer device TE is controlled to charge the battery cell A2 until it detects that the remaining power of the battery cell A2 is not less than the second remaining power corresponding to the battery cell A2. The transformer device TE is controlled to charge the battery cell A5 until it detects that the remaining power of the battery cell A5 is not less than the second remaining power corresponding to the battery cell A5.

[0102] It should be noted that the process of the transformer device TE charging the battery cell A2 and the battery cell A5 may be executed in series, or in parallel.

[0103] Figure 4b FIG. 1 is a schematic diagram of the battery status of a vehicle battery after equalization according to an embodiment of the present invention. Figure 4b As shown, the solution of the embodiment of the present invention can effectively balance the remaining power of each cell in the vehicle battery, thereby increasing the service life of the vehicle battery and reducing the cost of using the electric vehicle.

[0104] Figure 5 FIG. 1 is a schematic diagram of the main modules of a vehicle battery equalization processing device provided according to an embodiment of the present invention. Figure 5 As shown, the device 500 includes:

[0105] Battery detection module 501, used for real-time monitoring of vehicle batteries;

[0106] A cell determination module 502 is configured to determine, when the monitoring results indicate that the vehicle battery's rest time and the vehicle battery's battery condition meet a balancing trigger condition, a plurality of target cells to be processed in the vehicle battery based on the monitoring results, the plurality of target cells including at least one cell to be discharged and at least one cell to be charged;

[0107] The balancing processing module 503 is configured to perform charge balancing processing or discharge balancing processing on each target battery cell according to the battery capacity and the current first remaining power of the target battery cell included in the monitoring result.

[0108] Optionally,

[0109] The equalization processing module 503 is specifically used for:

[0110] Calculating a second remaining power after equalization corresponding to the target battery cell according to the battery cell capacity and the first remaining power of the target battery cell included in the monitoring result;

[0111] When the target cell is a cell to be discharged, a discharge balancing process is performed on the cell to be discharged based on the second remaining power;

[0112] When the target cell is a cell to be charged, charge balancing is performed on the cell to be charged based on the second remaining power.

[0113] Optionally, the equalization processing module 503 is specifically configured to:

[0114] Determining a balancing time according to the cell capacity of the target cell, the first remaining power, the second remaining power, and the balancing current;

[0115] The target cell is controlled to be electrically connected to the transformer device, and the power transfer between the target cell and the transformer device is controlled within the balancing time to achieve charge balancing or discharge balancing of the target cell.

[0116] Optionally, the equalization processing module 503 is specifically configured to:

[0117] For the target cell being the i-th cell to be discharged, the balancing current is the discharge current corresponding to the i-th cell to be discharged, and the balancing time of the i-th cell to be discharged is calculated using the following formula:

[0118] T 放i =(Cap 放i ×(SOC 放i -SOCT 放i )) / I 放i

[0119] T 放i is the equilibrium time corresponding to the i-th cell to be discharged, Cap放i is the cell capacity of the i-th cell to be discharged, I 放i is the discharge current corresponding to the i-th cell to be discharged, SOC 放i is the first remaining capacity of the i-th cell to be discharged, SOCT 放i is the second remaining capacity corresponding to the i-th battery cell to be discharged.

[0120] Optionally, the equalization processing module 503 is specifically configured to:

[0121] For example, if the target cell is the jth cell to be charged and the balancing current is the charging current corresponding to the jth cell to be charged, the balancing time of the jth cell to be charged is calculated using the following formula:

[0122] T 充j =(Cap 充j ×(SOCT 充j -SOC 充j )) / I 充j

[0123] T 充j is the balancing time corresponding to the jth cell to be charged, Cap 充j is the capacity of the jth cell to be charged, I 充j is the charging current corresponding to the jth cell to be charged, SOC 充j is the first remaining capacity corresponding to the jth cell to be charged, SOCT 充j is the second remaining power corresponding to the j-th battery cell to be charged.

[0124] Optionally, the equalization processing module 503 is specifically configured to:

[0125] When the target battery cell is a battery cell to be discharged, the battery cell to be discharged is controlled to provide power to the transformer device until it is detected that the remaining power of the battery cell to be discharged is not higher than a second remaining power corresponding to the battery cell to be discharged;

[0126] When the target cell is a cell to be charged, the transformer device is controlled to charge the cell to be charged until it is detected that the remaining power of the cell to be charged is not less than a second remaining power corresponding to the cell to be charged.

[0127] Optionally, the balancing trigger condition includes:

[0128] The vehicle battery has been at rest for longer than a time threshold, and the absolute value of the difference between the voltage of any cell in the vehicle battery and the average voltage is greater than a first difference threshold; the average voltage is the average of the voltages of all cells in the vehicle battery;

[0129] or,

[0130] The vehicle battery has been stationary for longer than a time threshold, and the absolute value of the difference between the current first remaining power of any battery cell in the vehicle battery and the average remaining power is greater than a second difference threshold; wherein the average remaining power is the average of the current first remaining power of all battery cells in the vehicle battery.

[0131] Optionally, the step of real-time monitoring of the vehicle battery is performed in at least one of the following scenarios:

[0132] The duration that the vehicle has not been started exceeds the preset vehicle static duration threshold, the installation duration of the vehicle battery exceeds the preset battery installation duration threshold, it is detected that the usage duration of the vehicle battery is less than the preset battery usage duration threshold, or an equalization processing instruction for the vehicle battery is received, etc.

[0133] An embodiment of the present invention provides a vehicle equipped with the aforementioned battery management system. By utilizing the battery management system to balance the vehicle's batteries, the vehicle battery's service life can be extended, reducing the maintenance and operating costs of the electric vehicle. Furthermore, by considering the cell capacity of target cells in the vehicle battery, precise balancing control can be performed on the target cells, resulting in improved balancing of the vehicle battery.

[0134] An embodiment of the present invention provides an electronic device, including:

[0135] one or more processors;

[0136] The storage device is used to store one or more programs. When the one or more programs are executed by one or more processors, the one or more processors implement the method of any of the above embodiments.

[0137] An embodiment of the present invention provides a computer program product, including a computer program. When the computer program is executed by a processor, the method of any of the above embodiments is implemented.

[0138] Reference below Figure 6 , which shows a structural diagram of a computer system 600 suitable for implementing the vehicle battery balancing processing method provided by an embodiment of the present invention. Figure 6 The terminal device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0139] like Figure 6As shown, the computer system 600 includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage portion 608 into a random access memory (RAM) 603. Various programs and data required for the operation of the computer system 600 are also stored in the RAM 603. The CPU 601, ROM 602, and RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0140] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, and the like; an output section 607 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 608 including a hard disk; and a communication section 609 including a network interface card such as a LAN card or a modem. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 610 as needed, so that computer programs read therefrom can be installed into the storage section 608 as needed.

[0141] In particular, according to the embodiments disclosed in the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 609, and / or installed from a removable medium 611. When the computer program is executed by the central processing unit (CPU) 601, the above-mentioned functions defined in the system of the present invention are performed.

[0142] It should be noted that the computer-readable medium described in the present invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media can include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. This propagated data signal can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wireline, optical fiber cable, RF, or any suitable combination thereof.

[0143] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the above-mentioned module, program segment, or a part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0144] The modules described in the embodiments of the present invention may be implemented in software or hardware. The modules described may also be located within a processor. For example, they may be described as a battery detection module, a cell identification module, and an equalization processing module. The names of these modules do not, in some cases, limit the modules themselves. For example, a battery detection module may also be described as a "module for real-time monitoring of the vehicle battery."

[0145] As another aspect, the present invention further provides a computer-readable medium, which may be included in the device described in the above embodiments, or may exist independently without being incorporated into the device. In one embodiment, the computer-readable medium carries one or more programs, and when the one or more programs are executed by the device, the device includes:

[0146] Real-time monitoring of vehicle batteries;

[0147] When the monitoring result indicates that the rest time of the vehicle battery and the battery condition of the vehicle battery meet the equalization trigger condition, a plurality of target cells to be processed in the vehicle battery are determined according to the monitoring result, the plurality of target cells including at least one cell to be discharged and at least one cell to be charged;

[0148] For each target battery cell, a charge balancing process or a discharge balancing process is performed on the target battery cell according to the battery cell capacity and the current first remaining power of the target battery cell included in the monitoring result.

[0149] According to the technical solution of an embodiment of the present invention, when a vehicle battery meets the equalization trigger condition, charge equalization or discharge equalization is performed on the target cell based on the cell capacity and the current first remaining power of the target cell included in the monitoring results. This can extend the service life of the vehicle battery and reduce the cost of using the electric vehicle. In addition, by considering the cell capacity of the target cell in the vehicle battery, the target cell can be accurately balanced, resulting in a better equalization effect for the vehicle battery.

[0150] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A vehicle battery equalization method, characterized in that: Applications in battery management systems, including: Real-time monitoring of vehicle batteries; If the monitoring result indicates that the rest time of the vehicle battery and the battery condition of the vehicle battery meet a balancing trigger condition, determine, based on the monitoring result, a plurality of target cells to be processed in the vehicle battery, the plurality of target cells including at least one cell to be discharged and at least one cell to be charged; For each of the target cells, charge balancing processing or discharge balancing processing is performed on the target cell according to the cell capacity and the current first remaining power of the target cell included in the monitoring result.

2. The method according to claim 1, characterized in that The performing charge balancing or discharge balancing on the target battery cell according to the battery cell capacity and the current first remaining power of the target battery cell included in the monitoring result includes: Calculating a second remaining power after equalization corresponding to the target battery cell according to the battery cell capacity of the target battery cell and the first remaining power included in the monitoring result; For the target battery cell being a battery cell to be discharged, performing discharge balancing processing on the battery cell to be discharged based on the second remaining power; When the target cell is a cell to be charged, charge balancing is performed on the cell to be charged based on the second remaining power.

3. The method according to claim 2, characterized in that The performing charge balancing or discharge balancing on the target battery cell includes: Determining a balancing time according to the cell capacity, the first remaining power, the second remaining power, and the balancing current of the target cell; The target cell is controlled to be electrically connected to a transformer device, and within the equalization time, the power transfer between the target cell and the transformer device is controlled to achieve charge equalization or discharge equalization for the target cell.

4. The method according to claim 3, characterized in that The determining of the balancing time according to the cell capacity, the first remaining power, the second remaining power, and the balancing current of the target cell includes: Assuming that the target cell is the i-th cell to be discharged, the balancing current is the discharge current corresponding to the i-th cell to be discharged, and the balancing time of the i-th cell to be discharged is calculated using the following formula: T 放i =(Cap 放i ×(SOC 放i -SOCT 放i )) / I 放i T 放i is the equilibrium time corresponding to the i-th cell to be discharged, Cap 放i is the cell capacity of the i-th cell to be discharged, I 放i is the discharge current corresponding to the i-th cell to be discharged, SOC 放i is the first remaining capacity of the i-th cell to be discharged, SOCT 放i is the second remaining capacity corresponding to the i-th battery cell to be discharged.

5. The method according to claim 3, characterized in that The determining of the balancing time according to the cell capacity, the first remaining power, the second remaining power, and the balancing current of the target cell includes: When the target cell is the jth cell to be charged, the balancing current is the charging current corresponding to the jth cell to be charged, and the balancing time of the jth cell to be charged is calculated using the following formula: T 充j =(Cap 充j ×(SOCT 充j -SOC 充j )) / I 充j T 充j is the balancing time corresponding to the jth cell to be charged, Cap 充j is the capacity of the jth cell to be charged, I 充j is the charging current corresponding to the jth cell to be charged, SOC 充j is the first remaining capacity corresponding to the jth cell to be charged, SOCT 充j is the second remaining power corresponding to the j-th battery cell to be charged.

6. The method according to claim 2, characterized in that The performing charge balancing or discharge balancing on the target battery cell includes: For the target battery cell being the battery cell to be discharged, controlling the battery cell to be discharged to provide power to the transformer device until it is detected that the remaining power of the battery cell to be discharged is not higher than a second remaining power corresponding to the battery cell to be discharged; When the target cell is the cell to be charged, the transformer device is controlled to charge the cell to be charged until it is detected that the remaining power of the cell to be charged is not less than a second remaining power corresponding to the cell to be charged.

7. The method according to claim 1, characterized in that The balancing triggering conditions include: The vehicle battery has been at rest for a period greater than a time threshold, and the absolute value of the difference between the voltage of any cell in the vehicle battery and the average voltage of the vehicle battery is greater than a first difference threshold; wherein the average voltage is the average voltage of all cells in the vehicle battery; or, The vehicle battery has been stationary for longer than a time threshold, and the absolute value of the difference between the current first remaining power of any battery cell in the vehicle battery and the average remaining power of the vehicle battery is greater than a second difference threshold; wherein the average remaining power is the average of the current first remaining power of all battery cells in the vehicle battery.

8. The method according to any one of claims 1 to 7, characterized in that The step of real-time monitoring of the vehicle battery is performed in at least one of the following scenarios: The duration that the vehicle has not been started exceeds a preset vehicle static duration threshold, the installation duration of the vehicle battery exceeds a preset battery installation duration threshold, it is detected that the usage duration of the vehicle battery is less than a preset battery usage duration threshold, or an equalization processing instruction for the vehicle battery is received.

9. A vehicle battery equalization processing device, characterized in that: Applications in battery management systems, including: Battery detection module, used to monitor vehicle batteries in real time; a cell determination module, configured to, when a monitoring result indicates that the rest time of the vehicle battery and the battery condition of the vehicle battery meet a balancing trigger condition, determine, based on the monitoring result, a plurality of target cells to be processed in the vehicle battery, wherein the plurality of target cells include at least one cell to be discharged and at least one cell to be charged; The balancing processing module is used to perform charge balancing processing or discharge balancing processing on each target battery cell according to the battery cell capacity and the current first remaining power of the target battery cell included in the monitoring result.

10. A vehicle, characterized in that: The vehicle is equipped with a battery management system according to any one of claims 1 to 8.

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