Method, device and equipment for controlling battery pack to absorb regenerative energy when fully charged, and storage medium

Abstract

This application discloses a method, apparatus, device, and storage medium for controlling the absorption of regenerated energy when a battery pack is fully charged, relating to the field of power battery technology. The method includes: determining the potential margin corresponding to a target temperature based on the key packaging error of individual battery cells; determining the three-electrode potential threshold corresponding to the target temperature based on the potential margin; determining the full-charge recharge rate of the individual battery cells at the target temperature based on the three-electrode potential threshold; generating a full-charge recharge strategy for the target battery pack based on the full-charge recharge rate of the individual battery cells at the target temperature; and controlling the target battery pack to absorb the regenerated energy generated by the vehicle when fully charged based on the full-charge recharge strategy. Through the above method, the recharge capability of the battery cells is detected, and the regenerated energy is absorbed according to the limit capability of the battery cells when the battery pack is fully charged, ensuring that there is no risk of lithium plating or fire after overcharging.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a control method, apparatus, equipment and storage medium for absorbing regenerated energy when a battery pack is fully charged. Background Technology

[0002] When pure electric vehicles use lithium iron phosphate battery packs, the typical operating range is 3%-100%. When the battery is fully charged, if the electric drive torque and speed are in opposite directions (usually driving in reverse for a short time before switching back to drive), there are two options: the battery pack continues to receive regenerative energy, or it does not. If the battery pack continues to receive regenerative energy, it may overcharge, and repeated overcharging poses risks of lithium plating and fire. If the battery pack does not receive regenerative energy, the vehicle may continue to roll without the driver applying the brakes, potentially causing a collision.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, device, and storage medium for controlling the absorption of regenerated energy when a battery pack is fully charged, in order to solve the technical problem in the prior art that the absorption of regenerated energy when a battery pack is fully charged can easily lead to overcharging, causing lithium plating and fire risks.

[0005] To achieve the above objectives, this application provides a method for controlling the absorption of regenerated energy when a battery pack is fully charged, the method comprising:

[0006] Based on the key packaging errors of individual battery cells, determine the potential margin corresponding to the target temperature;

[0007] Based on the potential margin corresponding to the target temperature, determine the three-electrode potential threshold corresponding to the target temperature;

[0008] Based on the three-electrode potential threshold corresponding to the target temperature, the full charge recharge rate of the battery cell at the target temperature is determined;

[0009] Based on the full charge recharge rate of the battery cell at the target temperature, a full charge recharge strategy for the target battery pack corresponding to the battery cell is generated.

[0010] Based on the full-charge recharge strategy, the target battery pack is controlled to absorb the regenerated energy generated by the vehicle when it is fully charged.

[0011] In one embodiment, the key packaging errors include temperature test accuracy error and state of charge consistency error, and the potential margin includes a first potential margin and a second potential margin;

[0012] The step of determining the potential margin corresponding to the target temperature based on the key packaging error of individual battery cells includes:

[0013] Based on the temperature testing accuracy error of individual battery cells, determine the first potential margin corresponding to the target temperature;

[0014] Based on the state-of-charge consistency error of the individual battery cells, the second potential margin corresponding to the target temperature is determined.

[0015] In one embodiment, the step of determining the first potential margin corresponding to the target temperature based on the temperature testing accuracy error of the battery cell includes:

[0016] Based on the temperature testing accuracy error of individual battery cells, determine the temperature testing range corresponding to the target temperature.

[0017] Based on the full-charge voltage data of the battery cell within the temperature test range, the voltage range of the battery cell within the temperature test range is determined.

[0018] The voltage range of the battery cell within the temperature test range is used as the first potential margin for the corresponding target temperature.

[0019] In one embodiment, the step of determining the second potential margin corresponding to the target temperature based on the state-of-charge consistency error of the battery cell includes:

[0020] Based on the consistency error of the state of charge of the individual battery cells, the state of charge test range is determined;

[0021] Based on the voltage data of the battery cell within the state of charge test range at the target temperature, determine the voltage range of the battery cell within the state of charge test range at the target temperature;

[0022] The voltage range of the battery cell within the state of charge test range is used as the second potential margin for the corresponding target temperature.

[0023] In one embodiment, the step of determining the full charge recharge rate corresponding to the target temperature based on the three-electrode potential threshold corresponding to the target temperature includes:

[0024] Based on the three-electrode potential threshold and the preset rate duration, the charging cutoff condition is determined;

[0025] Based on the charging cutoff condition, the charging test data of the battery cell at multiple charging rates to be tested are obtained;

[0026] Based on the charging test data, the minimum value of the three electrode potentials is determined;

[0027] When the measured charging rate corresponding to the minimum value of the three electrode potentials meets the preset accuracy conditions, the measured charging rate corresponding to the minimum value of the three electrode potentials is taken as the full charge recharge rate corresponding to the target temperature.

[0028] In one embodiment, the method further includes:

[0029] When the test rate corresponding to the minimum value of the three electrode potentials does not meet the preset accuracy conditions, the cutoff result of the charging test data is obtained;

[0030] When the cutoff result of the charging test data meets the preset rate duration, the test charging rate corresponding to the minimum value of the three electrode potential is divided downward to obtain a new test charging rate, and then the process of obtaining the charging test data of the battery cell under multiple test charging rates based on the charging cutoff condition is returned to be executed.

[0031] In one embodiment, the step of generating a full-charge recharge strategy for a target battery pack based on the full-charge recharge rate of the battery cell at the target temperature includes:

[0032] Based on the full charge recharge rate of the battery cell at the target temperature, determine the recharge capacity data of the battery cell;

[0033] Obtain the power coefficient of the battery cell after aging, wherein the number of cycles used for aging is determined based on the target operating conditions;

[0034] Based on the full charge recharge rate corresponding to the target temperature and the power value coefficient of the battery cell after aging, the aging current required at the target temperature is determined.

[0035] The rechargeability data is verified based on the aging current required at the target temperature.

[0036] After successful verification, a full-charge recharge strategy for the target battery pack corresponding to the battery cell is generated based on the recharge capability data of the battery cell.

[0037] Furthermore, to achieve the above objectives, this application also proposes a control device for absorbing regenerated energy when the battery pack is fully charged. The control device for absorbing regenerated energy when the battery pack is fully charged includes:

[0038] The potential margin reserve module is used to determine the potential margin corresponding to the target temperature based on the key packaging error of the battery cell.

[0039] The potential margin reservation module is also used to determine the three-electrode potential threshold corresponding to the target temperature based on the potential margin corresponding to the target temperature.

[0040] The recharge capability confirmation module is used to determine the full charge recharge rate of the battery cell at the target temperature based on the three-electrode potential threshold corresponding to the target temperature.

[0041] The recharge capability confirmation module is also used to generate a full-charge recharge strategy for the target battery pack corresponding to the battery cell based on the full-charge recharge rate of the battery cell at the target temperature.

[0042] The regenerative energy absorption module is used to control the target battery pack to absorb the regenerative energy generated by the vehicle when it is fully charged, based on the full-charge recharge strategy.

[0043] In addition, to achieve the above objectives, this application also proposes a control device for absorbing regenerated energy when the battery pack is fully charged. The control device for absorbing regenerated energy when the battery pack is fully charged includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for absorbing regenerated energy when the battery pack is fully charged as described above.

[0044] In addition, to achieve the above objectives, the present invention also proposes a storage medium, which is a computer-readable storage medium, and stores a computer program on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for absorbing regenerated energy when the battery pack is fully charged as described above.

[0045] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the control method for absorbing regenerated energy when the battery pack is fully charged as described above.

[0046] This application provides a method for controlling the absorption of regenerated energy by a battery pack when fully charged. Based on the key packaging error of individual battery cells, the method determines the potential margin corresponding to a target temperature; based on the potential margin corresponding to the target temperature, it determines the three-electrode potential threshold corresponding to the target temperature; based on the three-electrode potential threshold corresponding to the target temperature, it determines the full-charge recharge rate of the individual battery cells at the target temperature; based on the full-charge recharge rate of the individual battery cells at the target temperature, it generates a full-charge recharge strategy for the target battery pack corresponding to the individual battery cells; and based on the full-charge recharge strategy, it controls the target battery pack to absorb the regenerated energy generated by the vehicle when fully charged. This application detects the recharge capability of the battery cells and absorbs regenerated energy according to the limit capability of the cells when the battery pack is fully charged, ensuring that there is no risk of lithium plating or fire after overcharging, thus ensuring the safe use of the battery pack and cells. It solves the technical problem that the absorption of regenerated energy by a fully charged battery pack easily leads to overcharging, causing lithium plating and fire risks. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a flowchart illustrating an embodiment of the control method for absorbing regenerated energy when the battery pack is fully charged according to this application.

[0050] Figure 2 This is a flowchart illustrating Embodiment 2 of the control method for absorbing regenerated energy when the battery pack is fully charged according to this application.

[0051] Figure 3 This is a flowchart illustrating Embodiment 3 of the control method for absorbing regenerated energy when the battery pack is fully charged according to this application.

[0052] Figure 4 This is a schematic diagram of the three-electrode potentials for the control method of absorbing regenerated energy when the battery pack is fully charged, as provided in Embodiment 3 of this application.

[0053] Figure 5 This is a simplified flowchart illustrating the control method for absorbing regenerated energy when the battery pack is fully charged, as provided in Embodiment 3 of this application.

[0054] Figure 6 This is a schematic diagram of the module structure of the control device for absorbing regenerated energy when the battery pack is fully charged, according to an embodiment of this application.

[0055] Figure 7 This is a schematic diagram of the device structure of the hardware operating environment involved in the control method for absorbing regenerated energy when the battery pack is fully charged in the embodiments of this application.

[0056] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0057] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0058] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0059] The main solution of this application embodiment is as follows: based on the key packaging error of the battery cell, determine the potential margin corresponding to the target temperature; based on the potential margin corresponding to the target temperature, determine the three-electrode potential threshold corresponding to the target temperature; based on the three-electrode potential threshold corresponding to the target temperature, determine the full-charge recharge rate of the battery cell at the target temperature; based on the full-charge recharge rate of the battery cell at the target temperature, generate a full-charge recharge strategy for the target battery pack corresponding to the battery cell; based on the full-charge recharge strategy, control the target battery pack to absorb the regenerated energy generated by the vehicle when fully charged.

[0060] Currently, when the battery pack is fully charged, if the electric drive torque and speed are in opposite directions (usually after driving in R gear for a short time and then switching back to D gear), if the battery pack continues to receive regenerated energy, the battery pack will be overcharged. Repeated overcharging poses a risk of lithium plating and fire.

[0061] This application provides a solution that detects the rechargeability of battery cells and absorbs regenerated energy according to the cell's capacity limit when the battery pack is fully charged. This ensures that there is no risk of lithium plating or fire after the cell is overcharged in the early / late stages, thus ensuring the safe use of the battery pack and the cell. This solves the technical problem that the battery pack is prone to overcharging when absorbing regenerated energy when fully charged, which can lead to lithium plating and fire risks.

[0062] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions, or a control device for absorbing regenerated energy when the battery pack is fully charged, etc. This embodiment does not specifically limit it. The following uses a control device for absorbing regenerated energy when the battery pack is fully charged as an example to describe this embodiment and the following embodiments.

[0063] This application provides a method for controlling the absorption of regenerated energy when a battery pack is fully charged, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the control method for absorbing regenerated energy when the battery pack is fully charged according to this application.

[0064] In this embodiment, the control method for absorbing regenerated energy when the battery pack is fully charged includes steps S10~S50:

[0065] Step S10: Based on the key packaging error of the battery cell, determine the potential margin corresponding to the target temperature;

[0066] It should be noted that, theoretically, lithium plating will not occur when the three electrode potentials are >0mV. However, in actual applications, errors will occur after the battery cells are packaged. Therefore, a certain margin needs to be reserved, namely the potential margin. The key packaging error, that is, the important error involved in battery cell packaging, is related to the potential margin.

[0067] In this embodiment, key packaging errors may include temperature testing accuracy error and state of charge (SOC) consistency error. Temperature testing accuracy error is the error caused by the accuracy of temperature testing, which can usually be determined based on the accuracy of the temperature sensor used in the battery pack. State of charge (SOC) consistency error is the error caused by SOC consistency, which can usually be determined based on the SOC calculation error of the BMS (Battery Management System).

[0068] It is understandable that the potential margin includes a first potential margin and a second potential margin. The first potential margin is the margin that needs to be reserved based on the accuracy error of the temperature test, and the second potential margin is the margin that needs to be reserved based on the consistency error of the state of charge. The units for the first and second potential margins are usually millivolts (mV).

[0069] It should be understood that the recharge / recovery capacity of a single battery cell varies at different temperatures. The target temperature refers to the temperature set in this embodiment where the recharge capacity needs to be measured in order to formulate the final map. Typically, multiple target temperatures can be set according to the temperature range of the battery pack, for example, 45℃, 35℃, 25℃, 15℃, 5℃, 0℃, -5℃, and -15℃. This embodiment does not specifically limit these. Each set target temperature will determine a corresponding potential margin.

[0070] Additionally, it should be noted that in this embodiment, the battery cell can be a lithium iron phosphate cell. The rechargeability of the cell is detected according to the potential margin, and the rechargeable energy is absorbed according to the cell's capacity limit, so that the lithium iron phosphate battery pack will not cause lithium plating when absorbing rechargeable energy at full charge (SOC of 100%).

[0071] Step S20: Based on the potential margin corresponding to the target temperature, determine the three-electrode potential threshold corresponding to the target temperature;

[0072] It should be noted that the three-electrode potential threshold refers to the minimum three-electrode potential that will not result in lithium plating, determined after taking into account critical packaging errors.

[0073] It is understood that in this embodiment, the three-electrode potential threshold is determined based on the potential margin. The corresponding three-electrode potential threshold will be measured for each set target temperature, and the three-electrode potential threshold determined at different target temperatures is usually different.

[0074] In one feasible implementation, step S20 may include: adding the first potential margin corresponding to the target temperature to the second potential margin to obtain the three-electrode potential threshold corresponding to the target temperature.

[0075] It is understandable that the first potential margin and the second potential margin are added together to obtain the three-electrode potential threshold at the corresponding target temperature. For example, assuming that the first potential margin corresponding to 25℃ is a and the second potential margin is b, then the three-electrode potential threshold corresponding to 25℃ can be a+b.

[0076] In practical implementation, the three-electrode potential thresholds corresponding to 45℃, 35℃, 25℃, 15℃, 5℃, 0℃, -5℃, and -15℃ can be 10.03 mV, 8.02 mV, 6.21 mV, 7.21 mV, 8.22 mV, 6.22 mV, 8.01 mV, and 9.02 mV, respectively. The specific values ​​are determined based on actual testing and results, and this embodiment does not impose specific limitations on them.

[0077] Step S30: Based on the three-electrode potential threshold corresponding to the target temperature, determine the full charge recharge rate of the battery cell at the target temperature;

[0078] It should be noted that the full-charge recharge rate refers to the charging rate of a single battery cell when its SOC is 100%, which can be used to reflect the recharge capability of a single battery cell (converted to corresponding power / current). The full-charge recharge rate is measured for each set target temperature, and the full-charge recharge rate determined at different target temperatures is usually different. The full-charge recharge rate has a corresponding duration. Referring to the power duration when switching from R to D gear, the duration can be set to 5 seconds; this embodiment does not specifically limit this.

[0079] It is understandable that once the three-electrode potential threshold is determined, it can be assumed that lithium plating will not occur when the three-electrode potential of a single battery cell is greater than this threshold. For example, assuming the three-electrode potential threshold corresponding to 25°C is A, then for a single battery cell to not plating lithium at 25°C, the three-electrode potential must be greater than A.

[0080] It should be understood that charging tests can be conducted based on multiple preset charging rates to find the most suitable rate as the final full-charge recharge rate. In this embodiment, the full-charge recharge rate needs to be accurate to two decimal places.

[0081] Step S40: Based on the full charge recharge rate of the battery cell at the target temperature, generate a full charge recharge strategy for the target battery pack corresponding to the battery cell.

[0082] It should be noted that the target battery pack refers to a lithium iron phosphate battery pack based on lithium iron phosphate cells. The full-charge recharge strategy is the charging power map used by the BMS control when fully charged. This strategy is typically presented as a data table, containing full-charge recharge power limits at different temperatures; these limits represent the maximum recharge power at full charge. Because the full-charge recharge strategy is generated based on the cell's recharge capability at full charge, it ensures that the cell does not experience lithium plating throughout its entire lifespan.

[0083] In one feasible implementation, step S40 may include steps S401 to S405:

[0084] Step S401: Determine the recharge capacity data of the battery cell based on the full charge recharge rate of the battery cell at the target temperature.

[0085] It should be noted that the rechargeability data, which more intuitively reflects the rechargeability of the battery cell, is presented in this embodiment using the full-charge charging power, i.e., the charging power when fully charged. The full-charge charging power can be represented in the form of a data table.

[0086] Understandably, the charging power of a single battery cell at its full charge is calculated based on its recharge rate at the target temperature. Before calculation, it's necessary to determine the voltage at 100% SOC and the nominal capacity of the battery cell. The formula for calculating the full charge power of a single battery cell is as follows:

[0087]

[0088] In the formula, This indicates the full-charge charging power of a single battery cell. This indicates the full-charge recharge rate of a single battery cell. This indicates the nominal capacity of a single battery cell. This indicates the voltage corresponding to a single battery cell when its SOC is 100%.

[0089] It should be understood that, based on the above calculation formula, the full charge recharge rate of a single battery cell at the target temperature is converted into the corresponding recharge capacity data.

[0090] Step S402: Obtain the power coefficient of the battery cell after aging, wherein the number of cycles used for aging is determined based on the target operating conditions;

[0091] It should be noted that the target operating condition is determined by the most stringent conditions, which can be the vehicle's warranty requirements, such as an 8-year and 160,000-kilometer warranty. The target operating condition is then broken down into the number of aging cycles N required for each battery cell. Aging tests are then conducted on the battery cells according to this number of aging cycles to obtain the changes in the State of Health (SOH) of the battery cells after aging.

[0092] It is understandable that the power coefficient of a battery cell after aging is obtained based on the change in SOH after the cell ages (this power coefficient is the corresponding SOH value).

[0093] Step S403: Based on the full charge recharge rate corresponding to the target temperature and the power coefficient of the battery cell after aging, determine the aging current required for the target temperature.

[0094] It should be noted that the aging current requirement refers to the current demand after aging. The formula for calculating the aging current requirement is shown below:

[0095]

[0096] In the formula, Indicates the aging current requirement. This indicates the full-charge recharge rate of a single battery cell. This represents the power coefficient after a single battery cell has aged.

[0097] Step S404: Verify the recharge capability data based on the aging demand current corresponding to the target temperature;

[0098] Understandably, tests are conducted based on the aging current requirements to confirm whether individual battery cells can recover the corresponding energy according to the rechargeability data.

[0099] Step S405: After verification, based on the recharge capability data of the battery cell, generate a full-charge recharge strategy for the target battery pack corresponding to the battery cell.

[0100] Understandably, if the verification passes, a full-charge recharge strategy for the target battery pack will be generated based on the recharge capability data of the individual battery cells.

[0101] Step S50: Based on the full-charge recharge strategy, control the target battery pack to absorb the regenerated energy generated by the vehicle when it is fully charged.

[0102] It should be noted that by embedding the full-charge recharge strategy into the BMS of the target battery pack, the BMS controls the target battery pack to recover regenerated energy when it is fully charged. At this time, the target battery pack has the ability to recover energy after being fully charged.

[0103] Understandably, further verification is needed before practical application. On one hand, it's necessary to determine whether the 100% SOC current value corresponding to each target temperature is greater than the current value corresponding to 8 kW (the power generated when switching from R to D gear). On the other hand, it's necessary to determine whether all current values ​​at 100% SOC after aging are greater than the current value corresponding to 8 kW. If both conditions are met, the verification is successful, and the full-charge recharge strategy can be officially applied. If not, the verification fails, and the full-charge recharge ratio needs to be readjusted. The formula for calculating the current value corresponding to 8 kW is: I(8kW) = 8kW / number of series / cell voltage.

[0104] It should be understood that when the target battery pack is fully charged, if the electric drive torque and speed are in opposite directions (from R gear to D gear), regenerative energy is generated. According to the full-charge recharge strategy, the full-charge recharge power limit corresponding to the current temperature can be found. Thus, the target battery pack can be controlled to absorb energy according to the determined full-charge recharge power limit, so that the battery pack absorbs regenerative energy according to the limit capacity of the cells and avoids lithium plating.

[0105] This embodiment provides a method for controlling the absorption of regenerated energy when a battery pack is fully charged. Based on the key packaging error of individual battery cells, the potential margin corresponding to the target temperature is determined. Based on the potential margin corresponding to the target temperature, the three-electrode potential threshold corresponding to the target temperature is determined. Based on the three-electrode potential threshold corresponding to the target temperature, the full-charge recharge rate of the individual battery cells at the target temperature is determined. Based on the full-charge recharge rate of the individual battery cells at the target temperature, a full-charge recharge strategy for the target battery pack corresponding to the individual battery cells is generated. Based on the full-charge recharge strategy, the target battery pack is controlled to absorb the regenerated energy generated by the vehicle when fully charged. This embodiment detects the recharge capability of the battery cells and absorbs regenerated energy according to the limit capability of the cells when the battery pack is fully charged, ensuring that there is no risk of lithium plating or fire after overcharging, and ensuring the safe use of the battery pack and cells.

[0106] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in Embodiment 1 above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 Step S10 may include steps S101 to S102:

[0107] Step S101: Based on the temperature test accuracy error of the battery cell, determine the first potential margin corresponding to the target temperature;

[0108] It should be noted that the accuracy error of the temperature sensor used for the target battery pack corresponding to the individual battery cell can be used as the accuracy error of the temperature test.

[0109] In one feasible implementation, step S101 may include steps S1011 to S1013:

[0110] Step S1011: Based on the temperature test accuracy error of the battery cell, determine the temperature test range corresponding to the target temperature;

[0111] It should be noted that the temperature test range is the temperature range used to determine the first potential margin. Generally speaking, the lower limit of the temperature test range corresponding to the target temperature is equal to the target temperature minus the temperature test accuracy error, and the upper limit of the temperature test range corresponding to the target temperature is equal to the target temperature plus the temperature test accuracy error.

[0112] For example, assuming the temperature test accuracy error is 2℃ and the target temperature is 25℃, the lower limit of the temperature test range is 25℃-2℃=23℃, and the upper limit of the temperature test range is 25℃+2℃=27℃. At this time, the temperature test range is 23℃~27℃.

[0113] Understandably, the corresponding test temperature can be set according to the temperature test range. For example, if the temperature test range is 23℃~27℃, then the test temperature can be 23℃, 24℃, 25℃, 26℃, or 27℃.

[0114] Step S1012: Based on the full-charge voltage data of the battery cell within the temperature test range, determine the voltage range of the battery cell within the temperature test range.

[0115] It should be noted that the full-charge voltage data refers to the voltage value when the SOC is 100%. The battery cells are tested according to the test temperature to determine the voltage value of each battery cell at 100% SOC under each test temperature.

[0116] Understandably, based on the voltage values ​​of individual cells at 100% SOC under various test temperatures, the maximum and minimum voltage values ​​are found, and the difference between them is the voltage range of the individual cells within the temperature test range.

[0117] It should be understood that, in practice, a few sample battery cells (e.g., 3) can be selected from all the tested battery cells, and the voltage range of the sample battery cells within the temperature test range can be used as the voltage range of the battery cells within the temperature test range.

[0118] Step S1013: The voltage range of the battery cell within the temperature test range is used as the first potential margin for the corresponding target temperature.

[0119] Understandably, the calculated voltage range of a single battery cell within the temperature test range can be used as the first potential margin. For example, with a target temperature of 25°C, the voltage values ​​at 100% SOC are measured at 23°C / 24°C / 25°C / 26°C / 27°C. Three cells are taken as samples, and the range of all voltage values ​​among the three cells is selected as the first potential margin corresponding to 25°C.

[0120] Step S102: Based on the state-of-charge consistency error of the battery cell, determine the second potential margin corresponding to the target temperature.

[0121] It should be noted that the SOC calculation error of the BMS corresponding to the battery cell can be used as the state of charge consistency error.

[0122] In one feasible implementation, step S102 may include steps S1021 to S1023:

[0123] Step S1021: Determine the state of charge test range based on the consistency error of the state of charge of the battery cell;

[0124] It should be noted that the state of charge (SOC) test range is the range used to determine the second potential margin. Generally, the lower limit of the SOC test range corresponding to the target temperature is equal to 100% minus the SOC consistency error, and the upper limit of the SOC test range corresponding to the target temperature is equal to 100% plus the SOC consistency error.

[0125] For example, assuming the state of charge consistency error is 2%, the lower limit of the state of charge test range is 100%-2%=98%, and the upper limit of the state of charge test range is 100%+2%=102%, then the state of charge test range is 98%~102%.

[0126] Understandably, the corresponding test state of charge can be set according to the test range. For example, if the test state of charge is 98%~102%, then the test state of charge can be 98%, 99%, 100%, 101%, or 102%.

[0127] Step S1022: Based on the voltage data of the battery cell within the state of charge test range at the target temperature, determine the voltage range of the battery cell within the state of charge test range at the target temperature;

[0128] It should be noted that the voltage data refers to the voltage values ​​at each test state of charge. The battery cells are tested according to their test states of charge to determine the voltage values ​​of each cell at each test state of charge at the target temperature.

[0129] Understandably, based on the voltage values ​​of the battery cells at various test states of charge under the target temperature, the maximum and minimum voltage values ​​are found, and the difference between them is the voltage range of the battery cells within the test range of states of charge.

[0130] It should be understood that, in practice, a few sample battery cells (e.g., 3) can be selected from all the tested battery cells, and the voltage range of the sample battery cells within the state of charge test range can be used as the voltage range of the battery cells within the state of charge test range.

[0131] Step S1023: The voltage range of the battery cell within the state of charge test range is used as the second potential margin for the corresponding target temperature.

[0132] Understandably, the calculated voltage range of a single battery cell within the state of charge (SOC) test range can be used as the second potential margin. For example, at a target temperature of 25°C, the voltage values ​​corresponding to SOC of 98% / 99% / 100% / 101% / 102% are measured. Three cells are taken as samples, and the range of all voltage values ​​among the three cells is selected as the second potential margin corresponding to 25°C.

[0133] This embodiment provides a method for controlling the absorption of regenerated energy when a battery pack is fully charged. Based on the temperature testing accuracy error of individual battery cells, a first potential margin corresponding to the target temperature is determined; based on the state-of-charge consistency error of individual battery cells, a second potential margin corresponding to the target temperature is determined. This embodiment considers both temperature testing accuracy error and state-of-charge consistency error to determine the required potential margin, calculates the three-electrode potential threshold for preventing lithium plating, detects the rechargeability of the battery cells, and absorbs regenerated energy according to the ultimate capacity of the battery cells when the battery pack is fully charged. This ensures that there is no risk of lithium plating or fire after overcharging, thus ensuring the safe use of the battery pack and battery cells.

[0134] Based on the above embodiments of this application, in the third embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 Step S30 may include steps S301 to S304:

[0135] Step S301: Determine the charging cutoff condition based on the three-electrode potential threshold and the preset rate duration;

[0136] It should be noted that the preset charging rate duration is the duration of the charging rate used in the test, which is usually matched with the charging rate duration of the full charge return charge. You can refer to the power duration when switching from R to D mode, for example: 5s.

[0137] It is understandable that the charging cutoff condition is the cutoff condition set during the charging test. The charging cutoff condition typically includes a first charging cutoff condition and a second charging cutoff condition. The first charging cutoff condition is that the three-electrode potential is less than or equal to a three-electrode potential threshold, and the second charging cutoff condition is that the charging duration is greater than or equal to a preset rate duration. Charging stops when either the first or second charging cutoff condition is met.

[0138] Step S302: Based on the charging cutoff condition, obtain the charging test data of the battery cell at multiple charging rates to be tested;

[0139] It should be noted that the charging rate to be tested is the set charging rate used for the test, which can usually be set to three, for example: initially it can be set to 1C, 0.6C, and 0.2C. In actual implementation, since the recharge capability of the battery cell drops significantly after it is fully charged, a low charging rate can be used for initial testing.

[0140] Understandably, battery cells are charged according to the set charging rate to be tested, the preset duration of the charging rate, and the charging cutoff conditions. At least one group of battery cells is used for testing for each charging rate to be tested, and each group typically consists of three battery cells. (Reference) Figure 4 During charging, the three electrode potentials get closer to 0 mV as the SOC increases, where the A mV line is the threshold line for the three electrode potentials.

[0141] Step S303: Based on the charging test data, determine the minimum value of the three electrode potentials;

[0142] Understandably, based on the charging test data, the minimum value of the three electrode potentials of all battery cells under each tested charging rate is determined, i.e., the minimum value of the three electrode potentials.

[0143] It should be understood that the three-electrode potential can be detected by implanting a reference electrode in the battery cell, and it can usually be considered as the negative electrode potential.

[0144] Step S304: When the measured charging rate corresponding to the minimum value of the three electrode potentials meets the preset accuracy conditions, the measured charging rate corresponding to the minimum value of the three electrode potentials is taken as the full charge recharge rate corresponding to the target temperature.

[0145] It should be noted that the preset accuracy condition is the accuracy that the set full charge recharge rate needs to meet, for example: accurate to two decimal places.

[0146] Understandably, if the measured charge rate corresponding to the minimum three-electrode potential at the target temperature meets the preset accuracy conditions, then this measured charge rate can be used as the full-charge recharge rate. If the measured charge rate corresponding to the minimum three-electrode potential at the target temperature does not meet the preset accuracy conditions, then further testing is required.

[0147] In one feasible implementation, when the test rate corresponding to the minimum value of the three electrode potentials does not meet the preset accuracy condition, the cutoff result of the charging test data is obtained; when the cutoff result of the charging test data meets the preset rate duration, the test charging rate corresponding to the minimum value of the three electrode potentials is subjected to downward binary processing to obtain a new test charging rate, and the process returns to the step of obtaining the charging test data of the battery cell under multiple test charging rates based on the charging cutoff condition.

[0148] It should be noted that the cutoff result of the charging test data refers to the reason why the charging of a single battery cell stopped during the charging test. This could be because the charging time reached the preset rate duration, or because the three electrode potentials dropped to the three electrode potential threshold. A cutoff result that meets the preset rate duration means that the charging cutoff condition was met because the charging time reached the preset rate duration.

[0149] Understandably, if the preset accuracy conditions are not met, and the charging tests for each charging rate to be tested in the current round all meet the charging cutoff condition because the charging time reaches the preset rate duration, then the charging rate to be tested corresponding to the minimum value of the three electrode potentials is selected and divided downwards by two groups to obtain new charging rates to be tested. Charging tests are then performed according to these new charging rates to be tested until the rate is confirmed to two decimal places. For example, assuming the charging rate to be tested corresponding to the minimum value of the three electrode potentials is 0.6C, then it is divided downwards by 0.6C, i.e., the midpoint between 0.6C and 0.2C is taken, and a group of 0.4C is added. At this point, 0.6C, 0.4C, and 0.2C are used as new charging rates to be tested. Since 0.6C and 0.2C already have test results, only 0.4C needs to be confirmed in the next round.

[0150] It should be understood that if the cutoff result of the charging test data does not meet the preset rate duration, that is, in the current round, there are cases where the charging cutoff condition is met due to the three-electrode potential dropping to the three-electrode potential threshold in the charging test for each charging rate to be tested, then the charging rate to be tested that meets the charging cutoff condition due to the three-electrode potential dropping to the three-electrode potential threshold is found. This charging rate to be tested is then divided into two groups to obtain a new charging rate to be tested. Charging tests are then performed according to the new charging rate to be tested until the preset accuracy condition is met (the rate is confirmed to two decimal places). For example, assuming that the charging cutoff condition is met when the charging rate to be tested is 0.6C due to the three-electrode potential dropping to the three-electrode potential threshold, and the charging cutoff condition is met when the charging time reaches the preset rate duration when the charging rate to be tested is 0.2C, then a downward division can be performed according to 0.6C, that is, the midpoint between 0.6C and 0.2C is taken, and a group of 0.4C is added. 0.6C, 0.4C, and 0.2C are then used as new charging rates to be tested.

[0151] In practice, the full charge recharge rate corresponding to 45℃, 35℃, 25℃, 15℃, 5℃, 0℃, -5℃, and -15℃ during the specified charge rate duration can be 0.60C, 0.42C, 0.41C, 0.38C, 0.32C, 0.30C, 0.26C, and 0.24C, respectively. The specific values ​​are determined based on actual testing and results, and this embodiment does not impose any specific limitations on them.

[0152] This embodiment provides a method for controlling the absorption of regenerated energy when a battery pack is fully charged. Based on the three-electrode potential thresholds and a preset charging rate duration, a charging cutoff condition is determined. Based on the charging cutoff condition, charging test data of individual battery cells at multiple test charging rates are acquired. Based on the charging test data, the minimum value of the three-electrode potential is determined. When the test charging rate corresponding to the minimum value of the three-electrode potential meets a preset accuracy condition, the test charging rate corresponding to the minimum value of the three-electrode potential is used as the full-charge recharge rate corresponding to the target temperature. This embodiment detects the recharge capability of the battery cells, ensuring that the cells absorb regenerated energy according to their maximum capacity when the battery pack is fully charged. This ensures that there is no risk of lithium plating or fire after overcharging, thus ensuring the safe use of the battery pack and the battery cells.

[0153] For example, to help understand the implementation flow of the control method for absorbing regenerated energy when the battery pack is fully charged, obtained by combining this embodiment with the above-described embodiment three, please refer to... Figure 5 , Figure 5 A simplified flowchart illustrating a control method for absorbing regenerated energy when a battery pack is fully charged is provided. Specifically:

[0154] First, it's necessary to clarify the power output (e.g., 8kW) and duration (e.g., 5s) when the vehicle's lithium iron phosphate battery pack is fully charged and switched from R to D gear, along with the vehicle's warranty requirements (e.g., 8 years / 160,000 km). Next, based on the cell's three-electrode data, confirm the cell's recycling capability at 100% SOC to ensure no lithium deposition. Then, conduct cell aging tests (equivalent to 8 years / 160,000 km) and verify the power output using the aged cells. After successful verification, designate a BMS control map to ensure no lithium deposition throughout the cell's lifespan. Finally, determine if the 100% SOC current value at different temperatures is greater than the current value corresponding to 8kW. If it is, embed the map into the BMS; otherwise, readjust the three-electrode test current rate.

[0155] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method for absorbing regenerated energy when the battery pack is fully charged. Any simple modifications based on this technical concept are within the protection scope of this application.

[0156] This application also provides a control device for absorbing regenerated energy when the battery pack is fully charged. Please refer to [reference needed]. Figure 6 The control device for absorbing regenerated energy when the battery pack is fully charged includes:

[0157] The potential margin reserve module 10 is used to determine the potential margin corresponding to the target temperature based on the key packaging error of the battery cell.

[0158] The potential margin reservation module 10 is also used to determine the three-electrode potential threshold corresponding to the target temperature based on the potential margin corresponding to the target temperature.

[0159] The recharge capability confirmation module 20 is used to determine the full charge recharge rate of the battery cell at the target temperature based on the three-electrode potential threshold corresponding to the target temperature.

[0160] The recharge capability confirmation module 20 is also used to generate a full-charge recharge strategy for the target battery pack corresponding to the battery cell based on the full-charge recharge rate of the battery cell at the target temperature.

[0161] The regenerative energy absorption module 30 is used to control the target battery pack to absorb the regenerative energy generated by the vehicle when it is fully charged, based on the full-charge recharge strategy.

[0162] In one feasible implementation, the key packaging errors include temperature test accuracy error and state of charge consistency error, the potential margin includes a first potential margin and a second potential margin, and the potential margin reservation module 10 is also used to determine the first potential margin corresponding to the target temperature based on the temperature test accuracy error of the battery cell.

[0163] Based on the state-of-charge consistency error of the individual battery cells, the second potential margin corresponding to the target temperature is determined.

[0164] In one feasible implementation, the potential margin reservation module 10 is also used to determine the temperature test range corresponding to the target temperature based on the temperature test accuracy error of the battery cell.

[0165] Based on the full-charge voltage data of the battery cell within the temperature test range, the voltage range of the battery cell within the temperature test range is determined.

[0166] The voltage range of the battery cell within the temperature test range is used as the first potential margin for the corresponding target temperature.

[0167] In one feasible implementation, the potential margin reservation module 10 is also used to determine the state of charge test range based on the state of charge consistency error of the battery cell.

[0168] Based on the voltage data of the battery cell within the state of charge test range at the target temperature, determine the voltage range of the battery cell within the state of charge test range at the target temperature;

[0169] The voltage range of the battery cell within the state of charge test range is used as the second potential margin for the corresponding target temperature.

[0170] In one feasible implementation, the recharge capability confirmation module 20 is further used to determine the charging cutoff condition based on the three-electrode potential threshold and the preset rate duration.

[0171] Based on the charging cutoff condition, the charging test data of the battery cell at multiple charging rates to be tested are obtained;

[0172] Based on the charging test data, the minimum value of the three electrode potentials is determined;

[0173] When the measured charging rate corresponding to the minimum value of the three electrode potentials meets the preset accuracy conditions, the measured charging rate corresponding to the minimum value of the three electrode potentials is taken as the full charge recharge rate corresponding to the target temperature.

[0174] In one feasible implementation, the recharge capability confirmation module 20 is further configured to obtain the cutoff result of the charging test data when the test rate corresponding to the minimum value of the three electrode potentials does not meet the preset accuracy conditions.

[0175] When the cutoff result of the charging test data meets the preset rate duration, the test charging rate corresponding to the minimum value of the three electrode potential is divided downward to obtain a new test charging rate, and then the process of obtaining the charging test data of the battery cell under multiple test charging rates based on the charging cutoff condition is returned to be executed.

[0176] In one feasible implementation, the rechargeability confirmation module 20 is further configured to determine the rechargeability data of the battery cell based on the full-charge recharge rate of the battery cell at the target temperature.

[0177] Obtain the power coefficient of the battery cell after aging, wherein the number of cycles used for aging is determined based on the target operating conditions;

[0178] Based on the full charge recharge rate corresponding to the target temperature and the power value coefficient of the battery cell after aging, the aging current required at the target temperature is determined.

[0179] The rechargeability data is verified based on the aging current required at the target temperature.

[0180] After successful verification, a full-charge recharge strategy for the target battery pack corresponding to the battery cell is generated based on the recharge capability data of the battery cell.

[0181] The control device for absorbing regenerated energy when the battery pack is fully charged provided in this application adopts the control method for absorbing regenerated energy when the battery pack is fully charged in the above embodiments, which can solve the technical problem that the absorption of regenerated energy when the battery pack is fully charged can easily lead to overcharging, causing lithium plating and fire risks. Compared with the prior art, the beneficial effects of the control device for absorbing regenerated energy when the battery pack is fully charged provided in this application are the same as the beneficial effects of the control method for absorbing regenerated energy when the battery pack is fully charged provided in the above embodiments, and other technical features in the control device for absorbing regenerated energy when the battery pack is fully charged are the same as the features disclosed in the methods of the above embodiments, and will not be repeated here.

[0182] This application provides a control device for absorbing regenerated energy when a battery pack is fully charged. The control device for absorbing regenerated energy when a battery pack is fully charged includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method for absorbing regenerated energy when a battery pack is fully charged as described in Embodiment 1 above.

[0183] The following is for reference. Figure 7This document illustrates a schematic diagram of a control device suitable for absorbing regenerated energy when the battery pack is fully charged, as described in the embodiments of this application. The control device for absorbing regenerated energy when the battery pack is fully charged in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 7 The control device shown for absorbing regenerated energy when the battery pack is fully charged is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0184] like Figure 7 As shown, the control device for absorbing regenerated energy when the battery pack is fully charged may include a processing unit 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in ROM (Read Only Memory) 1002 or a program loaded from storage device 1003 into RAM (Random Access Memory) 1004. RAM 1004 also stores various programs and data required for the operation of the control device for absorbing regenerated energy when the battery pack is fully charged. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via bus 1005. Input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the control device for absorbing regenerated energy when the battery pack is fully charged to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows a control device for absorbing regenerated energy when the battery pack is fully charged, with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems can be implemented alternatively.

[0185] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0186] The control device for absorbing regenerated energy when the battery pack is fully charged provided in this application adopts the control method for absorbing regenerated energy when the battery pack is fully charged in the above embodiments, which can solve the technical problem that the absorption of regenerated energy when the battery pack is fully charged can easily lead to overcharging, causing lithium plating and fire risks. Compared with the prior art, the beneficial effects of the control device for absorbing regenerated energy when the battery pack is fully charged provided in this application are the same as the beneficial effects of the control method for absorbing regenerated energy when the battery pack is fully charged provided in the above embodiments, and other technical features in the control device for absorbing regenerated energy when the battery pack is fully charged are the same as the features disclosed in the method of the previous embodiment, and will not be repeated here.

[0187] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0188] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0189] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the control method for absorbing regenerated energy when the battery pack is fully charged in the above embodiments.

[0190] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0191] The aforementioned computer-readable storage medium may be included in a control device for absorbing regenerated energy when the battery pack is fully charged; or it may exist independently and not be assembled into a control device for absorbing regenerated energy when the battery pack is fully charged.

[0192] The aforementioned computer-readable storage medium carries one or more programs. When these programs are executed by a control device that absorbs regenerated energy when the battery pack is fully charged, the control device causes the battery pack to: determine the potential margin corresponding to the target temperature based on the key packing error of the individual battery cells; determine the three-electrode potential threshold corresponding to the target temperature based on the potential margin corresponding to the target temperature; determine the full-charge recharge rate of the individual battery cells at the target temperature based on the three-electrode potential threshold corresponding to the target temperature; generate a full-charge recharge strategy for the target battery pack corresponding to the individual battery cells based on the full-charge recharge rate of the individual battery cells at the target temperature; and control the target battery pack to absorb the regenerated energy generated by the vehicle when fully charged based on the full-charge recharge strategy.

[0193] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0194] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0195] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0196] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method for absorbing regenerated energy when the battery pack is fully charged. This solves the technical problem that absorbing regenerated energy when the battery pack is fully charged can easily lead to overcharging, causing lithium plating and fire risks. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the control method for absorbing regenerated energy when the battery pack is fully charged provided in the above embodiments, and will not be repeated here.

[0197] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method described above for absorbing regenerated energy when the battery pack is fully charged.

[0198] The computer program product provided in this application can solve the technical problem that a fully charged battery pack is prone to overcharging due to the absorption of regenerated energy, which can lead to lithium plating and fire risks. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the control method for the absorption of regenerated energy when the battery pack is fully charged provided in the above embodiments, and will not be repeated here.

[0199] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for controlling the absorption of regenerated energy when a battery pack is fully charged, characterized in that, The method includes: Based on the key packaging errors of individual battery cells, determine the potential margin corresponding to the target temperature; Based on the potential margin corresponding to the target temperature, determine the three-electrode potential threshold corresponding to the target temperature; Based on the three-electrode potential threshold corresponding to the target temperature, the full charge recharge rate of the battery cell at the target temperature is determined; Based on the full-charge recharge rate of the battery cell at the target temperature, a full-charge recharge strategy for the target battery pack corresponding to the battery cell is generated. Specifically, this includes: determining the recharge capacity data of the battery cell based on the full-charge recharge rate of the battery cell at the target temperature; obtaining the power value coefficient of the battery cell after aging, wherein the number of cycles used for aging is determined based on the target operating condition; determining the aging demand current corresponding to the target temperature based on the full-charge recharge rate corresponding to the target temperature and the power value coefficient of the battery cell after aging; verifying the recharge capacity data based on the aging demand current corresponding to the target temperature; and, after successful verification, generating a full-charge recharge strategy for the target battery pack corresponding to the battery cell based on the recharge capacity data of the battery cell. Based on the full-charge recharge strategy, the target battery pack is controlled to absorb the regenerated energy generated by the vehicle when it is fully charged.

2. The method as described in claim 1, characterized in that, The key packaging errors include temperature test accuracy error and state of charge consistency error; the potential margin includes a first potential margin and a second potential margin. The step of determining the potential margin corresponding to the target temperature based on the key packaging error of individual battery cells includes: Based on the temperature testing accuracy error of individual battery cells, determine the first potential margin corresponding to the target temperature; Based on the state-of-charge consistency error of the individual battery cells, the second potential margin corresponding to the target temperature is determined.

3. The method as described in claim 2, characterized in that, The step of determining the first potential margin corresponding to the target temperature based on the temperature test accuracy error of a single battery cell includes: Based on the temperature testing accuracy error of individual battery cells, determine the temperature testing range corresponding to the target temperature. Based on the full-charge voltage data of the battery cell within the temperature test range, the voltage range of the battery cell within the temperature test range is determined. The voltage range of the battery cell within the temperature test range is used as the first potential margin for the corresponding target temperature.

4. The method as described in claim 2, characterized in that, The step of determining the second potential margin corresponding to the target temperature based on the state-of-charge consistency error of the battery cell includes: Based on the consistency error of the state of charge of the individual battery cells, the state of charge test range is determined; Based on the voltage data of the battery cell within the state of charge test range at the target temperature, determine the voltage range of the battery cell within the state of charge test range at the target temperature; The voltage range of the battery cell within the state of charge test range is used as the second potential margin for the corresponding target temperature.

5. The method as described in claim 1, characterized in that, The step of determining the full-charge recharge rate corresponding to the target temperature based on the three-electrode potential threshold corresponding to the target temperature includes: Based on the three-electrode potential threshold and the preset rate duration, the charging cutoff condition is determined; Based on the charging cutoff condition, the charging test data of the battery cell at multiple charging rates to be tested are obtained; Based on the charging test data, the minimum value of the three electrode potentials is determined; When the measured charging rate corresponding to the minimum value of the three electrode potentials meets the preset accuracy conditions, the measured charging rate corresponding to the minimum value of the three electrode potentials is taken as the full charge recharge rate corresponding to the target temperature.

6. The method as described in claim 5, characterized in that, The method further includes: When the test rate corresponding to the minimum value of the three electrode potentials does not meet the preset accuracy conditions, the cutoff result of the charging test data is obtained; When the cutoff result of the charging test data meets the preset rate duration, the test charging rate corresponding to the minimum value of the three electrode potential is divided downward to obtain a new test charging rate, and then the process of obtaining the charging test data of the battery cell under multiple test charging rates based on the charging cutoff condition is returned to be executed.

7. A control device for absorbing regenerated energy when a battery pack is fully charged, characterized in that, The device includes: The potential margin reserve module is used to determine the potential margin corresponding to the target temperature based on the key packaging error of the battery cell. The potential margin reservation module is also used to determine the three-electrode potential threshold corresponding to the target temperature based on the potential margin corresponding to the target temperature. The recharge capability confirmation module is used to determine the full charge recharge rate of the battery cell at the target temperature based on the three-electrode potential threshold corresponding to the target temperature. The recharge capability confirmation module is also used to generate a full-charge recharge strategy for the target battery pack corresponding to the battery cell based on the full-charge recharge rate of the battery cell at the target temperature. The regenerative energy absorption module is used to control the target battery pack to absorb the regenerative energy generated by the vehicle when it is fully charged, based on the full-charge recharge strategy. The rechargeability confirmation module is also used to determine the rechargeability data of the battery cell based on the full-charge recharge rate of the battery cell at the target temperature. Obtain the power coefficient of the battery cell after aging, wherein the number of cycles used for aging is determined based on the target operating conditions; Based on the full charge recharge rate corresponding to the target temperature and the power value coefficient of the battery cell after aging, the aging current required at the target temperature is determined. The rechargeability data is verified based on the aging current required at the target temperature. After successful verification, a full-charge recharge strategy for the target battery pack corresponding to the battery cell is generated based on the recharge capability data of the battery cell.

8. A control device for absorbing regenerated energy when a battery pack is fully charged, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for absorbing regenerated energy when the battery pack is fully charged as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for absorbing regenerated energy when the battery pack is fully charged as described in any one of claims 1 to 6.

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