Battery pack control method and device, electronic equipment, vehicle and storage medium

Abstract

The invention relates to a battery pack control method and device, electronic equipment, a vehicle and a storage medium. The battery pack comprises a plurality of battery packs, the service life design of at least two battery packs in the plurality of battery packs is different, and the method comprises the following steps: when the battery pack discharges to an external load of equipment where the battery pack is located and the discharge power is greater than preset power, determining a state evaluation parameter of each battery pack; determining a target battery pack according to the state evaluation parameters; and controlling the target battery pack to discharge. The life redundancy can be applied to a scene in which the battery pack discharges to the external load of the equipment where the battery pack is located and the discharge power is greater than the preset power, so that a long-life battery pack or a battery pack with a better state becomes a bearing of a current discharge task, the discharge safety and the discharge capability are ensured, and the discharge efficiency is improved. The battery pack with short service life or poor state is protected, the state of each battery pack is balanced, and the service life attenuation of the whole battery pack is delayed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of batteries, and in particular to a battery pack control method and device, an electronic device, a vehicle and a storage medium. BACKGROUND

[0002] The application of V2G (Vehicle-to-Grid) or V2L (Vehicle to Load) has a great impact on the endurance of the vehicle, leading to frequent deep discharge of the battery system and accelerating the aging of the battery system. As the core energy storage unit, the performance and life of the battery system directly affect the feasibility and economy of the V2G / V2L application. Therefore, how to avoid the rapid decline of the overall life of the battery pack in the application of V2G / V2L has become a problem of concern. SUMMARY

[0003] To overcome the problems in the related art, the present disclosure provides a battery pack control method and device, an electronic device, a vehicle and a storage medium.

[0004] According to a first aspect of an embodiment of the present disclosure, a battery pack control method is provided, the battery pack comprising a plurality of battery groups, at least two battery groups in the plurality of battery groups having different life designs, the method comprising: determining a state evaluation parameter of each battery group when the battery pack discharges to an external load of a device where the battery pack is located, and the discharge power is greater than a preset power; determining a target battery group according to the state evaluation parameter; controlling the target battery group to discharge.

[0005] In the above technical solution, for a battery pack containing battery groups with different life designs, the state of each battery group is evaluated in real time when the battery pack discharges to an external load of a device where the battery pack is located, and the discharge power is greater than a preset power, and the target battery group most suitable for undertaking the discharge task is accurately selected based on this. In this way, the life redundancy can be applied to the scenario where the battery pack discharges to an external load of a device where the battery pack is located, and the discharge power is greater than a preset power, so that the battery group with a longer life, or the battery group with a better state, becomes the undertaker of the current discharge task, ensuring the safety and discharge capacity of the discharge, protecting the battery group with a shorter life or a worse state, balancing the states of the battery groups, and delaying the overall life decline of the battery pack.

[0006] In some possible implementations, the determination of the state evaluation parameter of each battery group comprises: For each battery group, a state evaluation parameter of the battery group is determined according to operating data of the battery group, the operating data comprising at least one of an SOH decay rate, a number of charge and discharge cycles, and a temperature.

[0007] In the technical solution, the SOH attenuation rate, cycle number, temperature and other multi-dimensional operation data are comprehensively used to accurately quantify the state of the battery pack, and single parameter misjudgment is avoided.

[0008] In some possible embodiments, the target battery pack is determined according to the state evaluation parameter, including: If the state evaluation parameters of the battery packs satisfy the first equalization condition, a preset time length is used as a rotation period, and the battery packs that are equalized in state are determined as the target battery packs; and / or, If the state evaluation parameters of the battery packs do not satisfy the first equalization condition, the battery pack corresponding to the minimum state evaluation parameter is determined as the target battery pack, wherein the state evaluation parameter of the battery pack and the battery state are in a negative correlation.

[0009] In the technical solution, when the states of the battery packs are equalized, the target battery pack is rotated for discharging, the battery pack loss is averaged, over-discharge of a single battery pack is prevented, the battery pack life is prolonged, and the reliability of the charging and discharging process is improved. When the states of the battery packs are not equalized, the attenuation pressure of the battery pack with a poor state or a short remaining life is relieved, and thus the battery pack life and the reliability of the charging and discharging process are improved.

[0010] In some possible embodiments, the first equalization condition includes that the difference values of the state evaluation parameters of the battery packs are all less than a first difference threshold.

[0011] In the technical solution, the first difference threshold is used to accurately evaluate whether the states of the battery packs are equalized, so that a suitable battery pack is selected to undertake the discharging task, and the battery pack life is prolonged.

[0012] In some possible embodiments, the method further includes: When the battery pack discharges to an internal load of a device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to a preset power, if the whole vehicle demand power is greater than or equal to a power threshold, the battery pack is controlled to discharge according to the SOH values of the battery packs.

[0013] In the technical solution, when the battery pack discharges to an internal load of a device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to a preset power, the discharging is controlled according to the SOH in a high power demand state, the aged battery pack is preferentially protected, overloading damage is avoided, the whole vehicle power demand is met, and a balance between safety and performance is achieved.

[0014] In some possible embodiments, the battery pack is controlled to discharge according to the SOH values of the battery packs, including: if the SOH of each battery pack is greater than or equal to the SOH threshold value, controlling each battery pack to discharge at full power; and / or, if there is a battery pack with SOH less than the SOH threshold value, controlling each battery pack to discharge according to a corresponding power distribution coefficient, wherein the SOH of the battery pack and the corresponding power distribution coefficient are in a positive correlation.

[0015] In the above technical solution, when it is determined that each battery pack is in a healthy state, each battery pack is controlled to discharge at full power, which can fully release the potential of healthy battery packs, avoid power distribution loss, and simplify the control logic. When there is a battery pack in an unhealthy state, each battery pack is controlled to discharge according to a corresponding power distribution coefficient, which can dynamically match the discharge process to the health state of the battery pack, discharge more from a high SOH battery to protect a low SOH battery pack, suppress the short board effect, and slow down the decay of the battery pack.

[0016] In some possible implementation manners, the method further includes: determining the sum of the SOH of each battery pack as a reference value; determining the ratio of the current battery pack to the reference value as the power distribution coefficient corresponding to the current battery pack.

[0017] In the above technical solution, the SOH ratio is used as the power distribution coefficient, the calculation process is simple and real-time, and the power distribution coefficient can be matched to the battery health degree to improve the reliability of the power distribution coefficient.

[0018] In some possible implementation manners, the method further includes: when the battery pack discharges to an internal load of a device where the battery pack is located, or when the battery pack discharges to an external load and the discharge power is less than or equal to a preset power, if the whole vehicle demand power is less than a power threshold value, controlling the battery pack to discharge according to the SOC value of each battery pack.

[0019] In the above technical solution, when the battery pack discharges to an internal load of a device where the battery pack is located, or when the battery pack discharges to an external load and the discharge power is less than or equal to a preset power, the discharge is controlled according to the SOC value of each battery pack in a low power demand state, which can balance the state of charge of each battery pack and further prolong the service life of the battery pack.

[0020] In some possible implementation manners, the controlling the battery pack to discharge according to the SOC value of each battery pack includes: if the SOC of each battery pack satisfies a second equalization condition, controlling each battery pack to discharge at the same power; and / or, if the SOC of each battery pack does not satisfy the second equalization condition, controlling the battery pack with the highest SOC to discharge.

[0021] In the above technical solution, when the SOC is balanced, the discharge is equalized, the consistency of the electric quantity between each battery pack can be maintained, and local over-discharge is prevented; when the SOC is unbalanced, the battery pack with the highest electric quantity is preferentially discharged, the difference can be quickly leveled, and the risk of deep discharge of the low-SOC battery pack is avoided.

[0022] In some possible implementation manners, the second balancing condition comprises: the difference value of the SOC of each battery pack is less than a second difference threshold.

[0023] In the above technical solution, the second difference threshold can be used to accurately evaluate whether the SOC of each battery pack is balanced, so as to select a suitable battery pack to undertake the discharge task, thereby prolonging the life of the battery pack.

[0024] In some possible implementation manners, the method further comprises: In the process of controlling the battery pack with the highest SOC to discharge, if it is determined that the difference value of the SOC of each battery pack is less than a third difference threshold, the battery packs are controlled to discharge at the same power.

[0025] In the above technical solution, while balancing the SOC, continuous focused discharge on a single battery pack can be avoided, and the risk of local over-discharge is prevented.

[0026] In some possible implementation manners, the method further comprises: The difference design of the battery pack life is achieved by at least one of the following manners: Different material systems of battery cells are selected to achieve the difference design of the battery pack life; Different energy densities of battery cells are selected to achieve the difference design of the battery pack life; Battery cells with different application boundaries are selected to achieve the difference design of the battery pack life, wherein the application boundaries comprise a battery temperature boundary for limiting a temperature range allowed when the battery cell works, and / or a battery current boundary for limiting a current range allowed when the battery cell works.

[0027] In the above technical solution, by selecting battery cells with different material systems, different energy densities, or setting different application boundaries of the battery cells, the difference design of the battery pack life can be achieved, and the life of different battery packs can be accurately controlled.

[0028] In some possible implementation manners, the battery cell is provided with a plurality of temperature ranges, and a range corresponding to a greater temperature value represents a greater battery power and a shorter battery cell life; and / or the battery cell is provided with a plurality of current ranges, and a range corresponding to a greater current value represents a greater battery power and a shorter battery cell life.

[0029] In the technical solution, the battery power is differentiated through the multi-interval design, and the overall performance of the battery pack is improved.

[0030] In some possible implementation manners, the method further includes: When the battery pack is in the charging working condition, if the SOC of each battery group is consistent, the battery pack is controlled to perform a corresponding charging strategy according to the power supply device.

[0031] In the technical solution, when the vehicle battery pack is charging, local overcharging or uneven charging caused by SOC difference can be avoided, efficient compatibility of the charging mode and the power supply facility is achieved, and charging safety and charging efficiency are improved.

[0032] In some possible implementation manners, the controlling the battery pack to perform a corresponding charging strategy according to the power supply device includes: If the power supply device is a high-voltage power supply device, each battery group is controlled to perform series high-voltage charging; and / or, If the power supply device is a normal-pressure power supply device, each battery group is controlled to perform parallel normal-pressure charging.

[0033] In the technical solution, the charging rate can be improved through series voltage boosting, and the output of the high-voltage power supply device is adapted; and the synchronous current is used in the series working condition, so as to ensure the balanced charging of each battery group and improve the safety of the charging process. In the normal-pressure charging, the charging current can be uniformly distributed, the pressure of a single battery group is reduced, the battery life is prolonged, and the charging efficiency and charging safety are improved.

[0034] In some possible implementation manners, the method further includes: The minimum SOC of each battery group is determined as the SOC of the battery pack; The SOC of the battery pack is displayed.

[0035] In the technical solution, the power state of the weakest link in the battery pack can be intuitively reflected, overdischarging is avoided, accurate power reference can be provided for the user, and the use experience is optimized.

[0036] According to a second aspect of the embodiments of the present disclosure, a battery pack control device is provided, the battery pack includes a plurality of battery groups, at least two battery groups in the plurality of battery groups have different life designs, and the device includes: A first determination module is configured to determine a state evaluation parameter of each battery group when the battery pack discharges to an external load of a device where the battery pack is located and the discharging power is greater than a preset power. A second determination module is configured to determine a target battery group according to the state evaluation parameter. A first control module is configured to control the target battery group to discharge.

[0037] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, comprising: a battery pack comprising a plurality of battery groups, at least two battery groups of the plurality of battery groups having different designed lifespans; a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the executable instructions in the memory to implement the steps of the battery pack control method provided by the first aspect of the present disclosure.

[0038] According to a fourth aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the electronic device provided by the third aspect of the present disclosure.

[0039] According to a fifth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, having stored thereon a computer program, which, when executed by a processor, implements the steps of the battery pack control method provided by the first aspect of the present disclosure.

[0040] According to a sixth aspect of the embodiments of the present disclosure, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of the battery pack control method provided by the first aspect of the present disclosure.

[0041] It should be understood that the general description above and the following detailed description below are only exemplary and explanatory and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure, together with the description.

[0043] Figure 1 is a flowchart of a battery pack control method according to an exemplary embodiment.

[0044] Figure 2 is a schematic diagram of a battery pack according to an exemplary embodiment.

[0045] Figure 3 is a correspondence between the lifespan and the capacity retention of a battery group with different designed lifespans according to an exemplary embodiment.

[0046] Figure 4 is a comparison diagram of a non-differentiated lifespan design battery pack and a battery pack with differentiated lifespan design according to an exemplary embodiment.

[0047] Figure 5is a flowchart of a battery pack control method when a battery pack discharges to an external load of a device in which the battery pack is located, and the discharge power is greater than a preset power, according to an example embodiment.

[0048] Figure 6 is a flowchart of a battery pack control method when a battery pack discharges to an internal load of a device in which the battery pack is located, or when a battery pack discharges to an external load and the discharge power is less than or equal to a preset power, according to an example embodiment.

[0049] Figure 7 is a flowchart of a battery pack control method when charging, according to an example embodiment.

[0050] Figure 8 is a block diagram of a battery pack control device, according to an example embodiment.

[0051] Figure 9 is a block diagram of a vehicle, according to an example embodiment. DETAILED DESCRIPTION

[0052] The example embodiments will be described in detail below with reference to the accompanying drawings. In the following description, the same numbers are used to designate the same elements, unless otherwise indicated. The implementations described in the following example embodiments do not represent all implementations consistent with the present disclosure. Instead, they only represent examples of devices and methods consistent with some aspects of the present disclosure, as detailed in the appended claims.

[0053] It should be noted that all actions of obtaining signals, information or data in the present disclosure are performed in compliance with the corresponding data protection regulations of the country where the device is located, and with the authorization given by the owner of the corresponding device.

[0054] Figure 1 is a flowchart of a battery pack control method, according to an example embodiment. The method can be applied to a battery management system of a vehicle. As shown in Figure 1 , the method includes steps S101 to S103.

[0055] In step S101, when a battery pack discharges to an external load of a device in which the battery pack is located, and the discharge power is greater than a preset power, the state evaluation parameters of each battery group are determined.

[0056] Wherein, the battery pack can be a separate box, and a battery pack can include multiple battery groups, and each battery group can include at least one battery cell. In the present disclosure, there is a difference in the design of the life of at least two battery groups in the multiple battery groups of the battery pack, as Figure 2As shown, there can be one long-life battery pack and one regular-life battery pack. The correspondence between the life cycle and capacity retention of battery packs of different life designs can be as shown. Figure 3 As such, through the design of the long-life battery pack, the life redundancy of the long-life battery pack can be applied to the discharge of the battery pack to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power, to avoid excessive wear of the regular-life battery pack.

[0057] For example, the external load of the device where the battery pack is located can be understood as a power consumption device connected outside the device. The preset power can be set based on actual needs, for example, it can be 1 kWh. When the battery pack is discharged to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power, the risk is high, and the external load will cause the battery pack to be deeply discharged, which has a greater impact on the life of the battery pack. At this time, by determining the state evaluation parameter of each battery pack, the state of the battery pack can be more accurately determined, and the discharge strategy can be optimized and managed, which can ensure the safety and long-term reliability of the battery pack.

[0058] For example, the battery pack for a vehicle has bidirectional charging and discharging capability. It can not only drive the vehicle and supply power to the on-board equipment, but also reversely output the stored electrical energy. This capability enables the battery pack to serve the power grid (V2G) or supply power to external power consumption equipment (V2L), such as providing emergency power supply. The discharge power of the battery pack in the V2G or V2L scenario reaches the level of kWh, that is, the battery pack in the V2G or V2L scenario is discharged to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power. At this time, by determining the first state evaluation parameter of each battery pack, the optimization and management of the discharge strategy can be realized, which can ensure the safety and long-term reliability of the battery pack.

[0059] In step S102, the target battery pack is determined according to the state evaluation parameter.

[0060] For example, if the state evaluation parameter of the battery pack and the remaining life are negatively correlated, the battery pack corresponding to the minimum state evaluation parameter can be determined as the target battery pack; otherwise, if the state evaluation parameter of the battery pack and the remaining life are positively correlated, the battery pack corresponding to the maximum state evaluation parameter can be determined as the target battery pack. In this way, the discharge load can be preferentially directed to the target battery pack with a longer remaining life, thereby prolonging the overall life of the battery pack.

[0061] On the basis of the different life designs, the long-life battery pack is preferentially used when the battery pack is in use. With the long-period use of V2L / V2G, the remaining life of the long-life battery pack gradually catches up with that of the regular-life battery pack. When the catching up is completed, the battery pack with a high remaining life can be controlled to be preferentially used in the V2G / V2L mode. The process can be as shown.Figure 4 As shown Figure 4 The correspondence between the life cycle and the capacity retention of the non-differential life design battery pack during use is also given, based on Figure 4 It can be determined that the service life of the battery pack adopting the differential life design is longer.

[0062] In step S103, the target battery pack is controlled to discharge.

[0063] For example, controlling the target battery pack to discharge can be understood as assigning the discharge task to the target battery pack.

[0064] In the above technical solution, for the battery pack containing battery packs with different life designs, when the battery pack discharges to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power, the state of each battery pack is evaluated in real time, and the target battery pack most suitable for undertaking the discharge task is accurately selected based on this. In this way, the life redundancy can be applied to the scenario where the battery pack discharges to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power, so that the battery pack with long life, or the battery pack with better state, becomes the undertaker of the current discharge task, ensuring the safety and discharge capacity of the discharge, and protecting the battery pack with shorter life or worse state, balancing the state of each battery pack, and delaying the overall life attenuation of the battery pack.

[0065] In some possible embodiments, at least one battery cell is included in the battery pack, and the battery pack control method provided by the present disclosure further includes: The differential design of the battery pack life is realized by at least one of the following ways: Different material systems of battery cells are selected to realize the differential design of the battery pack life; Battery cells with different energy densities are selected to realize the differential design of the battery pack life; Battery cells with different application boundaries are selected to realize the differential design of the battery pack life, wherein the application boundary includes a battery temperature boundary and / or a battery current boundary, the battery temperature boundary is used to limit the temperature range allowed by the battery cell during operation, and the battery current boundary is used to limit the current range allowed by the battery cell during operation.

[0066] For example, the mainstream battery monomer positive electrode material system in the current power battery field includes nickel cobalt manganese ternary (NCM) and lithium iron phosphate (LFP). Based on the intrinsic characteristics of the positive electrode material, in general, the overall cycle life of the battery monomer using LFP positive electrode material is better than that of the battery monomer using NCM positive electrode material. The present disclosure can utilize this characteristic to match the battery monomers with different positive electrode materials in different battery packs, thereby designing battery packs with differentiated life characteristics. The negative electrode materials of the current power battery are mainly graphite and silicon-based negative electrodes. Silicon-based negative electrodes have high theoretical gram capacity and can improve the energy density of battery monomers, but the life is lower than that of graphite negative electrodes. Therefore, the present disclosure configures battery monomers with different negative electrode materials in different battery packs to achieve differentiated design of the life among different battery packs.

[0067] For example, the energy density can be controlled by controlling the compaction density / group threshold. The energy density affects the life of the battery monomer, and by configuring battery monomers with different energy densities for different battery packs, the differentiated design of the life among different battery packs is achieved.

[0068] For example, the life attenuation of the battery monomer is closely related to its actual application state. Therefore, battery monomers with different application boundaries are selected, and the temperature interval and current interval of different monomer batteries are set to achieve differentiated design of the life among different battery packs.

[0069] Among them, the battery monomer is provided with multiple temperature intervals, and the interval corresponding to a larger temperature value represents a larger battery power and a shorter battery monomer life; and / or, the battery monomer is provided with multiple current intervals, and the interval corresponding to a larger current value represents a larger battery power and a shorter battery monomer life.

[0070] The attenuation of the battery monomer at high temperature is usually more significant. At least two levels of temperature application boundaries can be set for the battery monomer, for example, two different temperature intervals are set (such as a high temperature interval and a conventional interval). The high temperature interval allows a higher maximum charging temperature and discharging temperature (for example, for LFP: high temperature interval 60℃, conventional interval 55℃; for NCM: high temperature interval 55℃, conventional interval 50℃). In this way, the charging performance and high-temperature discharging power can be improved through the design of multiple temperature intervals.

[0071] Large current causes temperature rise and approaches the charging and discharging limit, accelerating the life attenuation. At least two levels of charging current application boundaries can be set for the battery monomer, for example, two different current intervals are set. The large current interval allows a higher charging and discharging current to achieve fast charging and discharging. While the charging and discharging process in the vehicle-to-grid (V2G) and vehicle-to-load (V2L) modes is usually gentle, the conventional current interval can be used for control in the V2G / V2L scenario.

[0072] Therefore, by the multi-zone design, the battery power differentiation is realized, and the overall performance of the battery pack can be improved.

[0073] In some possible implementation manners, in step S101, the state evaluation parameter of each battery pack is determined, including: For each battery pack, the state evaluation parameter of the battery pack is determined according to the operation data of the battery pack.

[0074] The operation data can include at least one of a SOH (State of Health) decay rate, a charge-discharge cycle number and a temperature.

[0075] For example, the SOH decay rate can be the average capacity decay of nearly 50 cycles, the charge-discharge cycle number can be the charge-discharge cycle number of the battery pack, and the temperature can be the real-time temperature of the battery pack. For example, the state evaluation parameter of the battery pack can be obtained by weighted summation, and the sum of the weights can be 1. The weight corresponding to the temperature can gradually increase as the temperature increases, and the weights corresponding to the SOH decay rate and the charge-discharge cycle number can be dynamically adjusted according to the values thereof, for example, the higher the decay rate, the greater the weight corresponding to the decay rate; the more the cycle number, the greater the weight corresponding to the cycle number. In this way, by dynamically adjusting the weights, the influence of the aging factors such as high temperature, high decay and high cycle number can be strengthened, so that the state evaluation parameter can more accurately reflect the real life risk of the battery pack, and provide a reliable basis for subsequent optimization control.

[0076] For example, the state evaluation parameter of the i th battery pack can be determined by the following formula :

[0077] wherein, is the SOH decay rate of the i th battery pack, is the weight corresponding to the SOH decay rate of the i th battery pack, is the charge-discharge cycle number of the i th battery pack, is the weight corresponding to the charge-discharge cycle number of the i th battery pack, is the temperature of the i th battery pack, is the weight corresponding to the temperature of the i th battery pack.

[0078] In this way, by comprehensively considering the multi-dimensional operation data such as the SOH decay rate, the cycle number and the temperature, the state of the battery pack can be accurately quantified, and the single parameter misjudgment can be avoided.

[0079] Figure 5is a flow chart of a battery pack control method when a battery pack discharges to an external load of a device where the battery pack is located and the discharge power is greater than a preset power according to an exemplary embodiment. Through the Figure 5 The implementation process of the battery pack control method provided by the present disclosure can be more clearly understood when the battery pack discharges to an external load of a device where the battery pack is located and the discharge power is greater than a preset power. As shown in Figure 5 , the method can include steps S201 to S205.

[0080] In step S201, the state evaluation parameter of each battery pack is determined.

[0081] In step S202, it is determined whether the state evaluation parameter of each battery pack satisfies a first balancing condition. If yes, step S203 is performed; if no, step S204 is performed.

[0082] In an embodiment, the first balancing condition includes that the difference value of the state evaluation parameter of each battery pack is less than a first difference threshold.

[0083] For example, the first difference threshold can be preset based on actual needs, for example, can be set to 5%. In this way, the first difference threshold can be used to accurately evaluate whether the state of each battery pack is balanced, so as to select a suitable battery pack to undertake the discharge task, thereby prolonging the service life of the battery pack.

[0084] In step S203, the state balanced battery packs are determined as target battery packs in a rotation cycle with a preset time length.

[0085] For example, the battery packs can be arranged in a descending order of the state evaluation parameter to generate a circulation sequence, and the battery packs in the sequence are sequentially determined as target battery packs in a rotation cycle with a preset time length; when the whole group rotation is completed, the first group in the sequence is returned to circulate. For example, the state evaluation parameter of the first battery pack is the state evaluation parameter of the second battery pack the state evaluation parameter of the third battery pack , and the difference value of the three is less than the first difference threshold, a rotation cycle with a preset time length can be used to rotate and discharge in the order of the third battery pack→the second battery pack→the first battery pack→the third battery pack……. The preset time length can be preset based on actual needs, for example, can be set to 1h.

[0086] In this way, the target for rotation discharge can be balanced when the state of each battery pack is balanced, the battery pack wear can be averaged, the over-discharge of a single battery pack can be prevented, the service life of the battery pack can be prolonged, and the reliability of the charging and discharging process can be improved.

[0087] In step S204, the battery pack corresponding to the minimum state evaluation parameter is determined as the target battery pack.

[0088] The state evaluation parameter of the battery pack and the battery state are in a negative correlation.

[0089] For example, if the state evaluation parameter of the first battery pack is greater than the state evaluation parameter of the second battery pack, it can be determined that the state of the first battery pack is better, and the first battery pack can be determined as the target battery pack. The state evaluation parameter of the second battery pack The state of the first battery pack is better, and the first battery pack can be determined as the target battery pack. In this way, the attenuation pressure of the battery pack with a poor state or a short remaining life can be relieved, so as to improve the life of the battery pack and the reliability of the charging and discharging process.

[0090] In step S205, the target battery pack is controlled to discharge.

[0091] In Figure 5 In the technical solution shown in the figure, when the battery pack discharges to an external load of the device where the battery pack is located, and the discharging power is greater than the preset power, the target battery pack can be adaptively determined according to the balancing of the states of the battery packs, which can prevent the state difference between the battery packs from being enlarged, reduce the risk of local over-discharge, and further prolong the life of the battery pack and the reliability of the charging and discharging process.

[0092] In some possible implementation manners, the battery pack control method provided by the present disclosure can further include: When the battery pack discharges to an internal load of the device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to the preset power, if the demand power of the whole vehicle is greater than or equal to the power threshold, the battery pack is controlled to discharge according to the SOH values of the battery packs.

[0093] For example, the power threshold can be preset based on the actual demand, for example, can be set to 30 kw. When the battery pack discharges to an internal load of the device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to the preset power, the influence of the external load on the battery pack is small or does not exist, and the discharging risk is low. If the demand power of the whole vehicle is greater than or equal to the power threshold, it can be determined that the battery pack will discharge at a high power, and the high-power discharge has a greater influence on the health of the battery pack, and at this time, the discharging task can be preferentially borne by the healthy battery pack (high-SOH battery pack) to prolong the life of the battery pack. That is, in the case where the battery pack discharges to an internal load of the device where the battery pack is located, or the battery pack discharges to an external load and the discharging power is less than or equal to the preset power, the discharging is controlled according to the SOH in the case of high-power demand, the aging battery pack can be preferentially protected to avoid overload damage, the demand of the whole vehicle for power can be met, and the balance between safety and performance can be achieved.

[0094] In some possible implementation manners, the battery pack control method provided by the present disclosure can further include: When the battery pack discharges to an internal load of the device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to a preset power, if the vehicle demand power is less than the power threshold, the battery pack is controlled to discharge according to the SOC values of the battery groups.

[0095] For example, when the battery pack discharges to an internal load of the device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to a preset power, the influence of the external load on the battery pack is small or does not exist, and the risk of discharging is low. If the vehicle demand power is less than the power threshold, it can be determined that the battery pack will discharge at low power, and the aging effect is weak at low power discharge, but sensitive to the difference in electric quantity, so the discharging can be controlled by using the SOC at low power discharge. For example, the battery group with high SOC in the battery pack can be preferentially controlled to discharge. In this way, the state of charge of each battery group can be balanced, and the life of the battery pack can be prolonged.

[0096] Figure 6 is a flowchart of a battery pack control method according to an example embodiment. Through the Figure 6 The implementation process of the battery pack control method provided by the disclosure can be more clearly understood when the battery pack discharges to an internal load of the device where the battery pack is located, or when the battery pack discharges to an external load and the discharging power is less than or equal to a preset power. As shown in the flowchart, the method can include steps S301 to S308. Figure 6

[0097] In step S301, it is determined whether the vehicle demand power is greater than or equal to the power threshold. If yes, step S302 is performed; if no, step S305 is performed.

[0098] In step S302, it is determined whether the SOH of each battery group is greater than or equal to the SOH threshold. If yes, step S303 is performed; if no, step S304 is performed.

[0099] For example, the SOH threshold can be preset based on actual needs, for example, it can be set to 85%.

[0100] In step S303, each battery group is controlled to discharge at full power.

[0101] For example, if the SOH of each battery group is greater than or equal to the SOH threshold, it can be determined that each battery group is in a healthy state, and at this time, each battery group is controlled to discharge at full power, which can fully release the potential of the healthy battery group, avoid power distribution loss, and simplify the control logic.

[0102] ​In step S304, each battery pack is discharged according to the corresponding power distribution coefficient.

[0103] The SOH of the battery pack and the corresponding power distribution coefficient are in a positive correlation.

[0104] For example, if the condition that the SOH of each battery pack is greater than or equal to the SOH threshold is not met, it can be determined that there is a battery pack with SOH less than the SOH threshold. In other words, there is a battery pack with an unsatisfactory health state. At this time, each battery pack can be controlled to be discharged according to the corresponding power distribution coefficient. In this way, the discharging process can be dynamically matched with the battery pack health state, and high-SOH batteries can be discharged more to protect low-SOH battery packs, inhibit the short-board effect, and delay the degradation of the battery pack.

[0105] For example, the power distribution coefficient corresponding to different SOH can be pre-calibrated based on actual needs.

[0106] For example, the power distribution coefficient of the battery pack can be determined in the following manner: The sum of the SOH of each battery pack is determined as a reference value; The ratio of the current battery pack to the reference value is determined as the power distribution coefficient corresponding to the current battery pack.

[0107] For example, the power distribution coefficient of the i-th battery pack can be determined by the following formula :

[0108] wherein, SOH of the i-th battery pack, the sum of the SOH of each battery pack, and n is the number of battery packs.

[0109] In this way, the SOH proportion is used as the power distribution coefficient, the calculation process is simple and real-time, and the reliability of the power distribution coefficient can be ensured to match the battery health degree and improve the reliability of the power distribution coefficient.

[0110] In step S305, it is determined whether the SOC of each battery pack satisfies a second equalization condition. If yes, step S306 is performed; if no, step S307 is performed.

[0111] For example, the second equalization condition includes that the difference value of the SOC of each battery pack is less than a second difference threshold.

[0112] For example, the second difference threshold can be pre-set based on actual needs, for example, it can be set to 5%. In this way, the second difference threshold can be used to accurately evaluate whether the SOC of each battery pack is balanced, so as to select a suitable battery pack to undertake the discharging task, thereby prolonging the life of the battery pack.

[0113] In step S306, the control is performed to discharge the battery packs at the same power.

[0114] For example, if the battery pack includes the first battery pack and the second battery pack, and the SOC of the first battery pack and the second battery pack is in the balanced state, the first battery pack and the second battery pack can be controlled to discharge at the same power of 1:1 at the same time. In this way, the equal discharge when the SOC is balanced can maintain the consistency of the electric quantity among the battery packs and prevent local over-discharge.

[0115] In step S307, the battery pack with the highest SOC is controlled to discharge.

[0116] For example, if the battery pack includes the first battery pack and the second battery pack, and the SOC of the first battery pack is 85% and the SOC of the second battery pack is 78%, the first battery pack can be controlled to discharge. In this way, the highest electric quantity battery pack is preferentially discharged when the SOC is unbalanced, which can quickly flatten the difference and avoid the risk of deep discharge of the low SOC battery pack.

[0117] In step S308, it is determined whether the difference values of the SOCs of the battery packs are all less than a third difference threshold value. If yes, step S306 is performed; if no, step S307 is performed.

[0118] For example, the third difference threshold value can be pre-set based on actual needs, for example, it can be set to 2%. If the difference values of the SOCs of the battery packs are all less than the third difference threshold value, it is determined that the SOCs of the battery packs enter the balanced state. At this time, in order to maintain the consistency of the electric quantity among the battery packs, the battery packs can be controlled to discharge at the same power. In this way, the equal discharge when the SOC is balanced can avoid the continuous focused discharge on a single battery pack and prevent the risk of local over-discharge.

[0119] In Figure 6 In the technical solution shown, through the dual criteria of power demand and battery state, the optimal discharge strategy can be dynamically adapted, the short plate battery is protected by differentiating the health state at high power, and the current is balanced by preferentially discharging the high electric quantity at low power, so that the life extension and discharge optimization are realized.

[0120] In some possible implementation manners, the battery pack control method provided by the present disclosure can further include: When the battery pack is in the charging working condition, if the SOCs of the battery packs are consistent, the battery pack is controlled to perform a corresponding charging strategy according to the power supply device.

[0121] For example, the power supply device can be a charging pile. When the vehicle battery pack is charging, if the SOCs of the battery groups in the battery pack are consistent, the optimal charging strategy can be adaptively triggered based on the power supply device to avoid local overcharging or uneven charging caused by SOC differences, realize efficient compatibility of the charging mode and the power supply facility, and improve charging safety and charging efficiency.

[0122] Figure 7 is a flowchart of a battery pack control method during charging according to an example embodiment. Through the Figure 7 The implementation process of the battery pack control method provided by the present disclosure when the battery pack is in a charging working condition can be more clearly understood. As shown in Figure 7 The method can include steps S401 to S405.

[0123] In step S401, it is determined whether the SOCs of the battery groups are consistent. If yes, step S402 is performed; if no, step S405 is performed.

[0124] In step S402, it is determined whether the power supply device is a high-voltage power supply device. If yes, step S403 is performed; if no, step S404 is performed.

[0125] In step S403, the battery groups are controlled to be charged in series under high voltage.

[0126] For example, the power supply device is a high-voltage charging pile. In this way, the charging rate can be improved by series voltage boosting to adapt to the output of the high-voltage power supply device, and the current can be synchronized under series working condition to ensure balanced charging of the battery groups and improve the safety of the charging process.

[0127] In step S404, the battery groups are controlled to be charged in parallel under normal pressure.

[0128] For example, the power supply device is a normal pressure charging pile. In this way, the charging current can be evenly distributed when charging under normal pressure, reducing the pressure on individual battery groups, prolonging the battery life, and improving charging efficiency and charging safety.

[0129] In step S405, the battery groups with an SOC less than a first SOC threshold are synchronously charged, and the battery groups with an SOC reaching the first SOC threshold are not charged.

[0130] For example, the first SOC threshold can be preset based on actual needs, for example, can be set to 100%. It can be identified whether there is a battery pack that is not fully charged (SOC is less than the first SOC threshold) in the battery pack, and the battery pack that is not fully charged is synchronously charged, and the battery pack that is fully charged is not charged. For example, the battery pack includes a first battery pack and a second battery pack, if both the first battery pack and the second battery pack are not fully charged, the first battery pack and the second battery pack can be synchronously charged, if the first battery pack is fully charged and the second battery pack is not fully charged, the charging of the first battery pack is stopped, and the second battery pack continues to be charged until the second battery pack is also fully charged, and the charging of the battery pack is stopped.

[0131] In this way, the power of the low-SOC battery pack can be increased first, the power of each battery pack can be balanced, the overall performance of the battery pack can be improved, the service life of the battery pack can be prolonged, and the charging safety and reliability can be ensured.

[0132] In Figure 7 In the technical solutions shown, the SOC and the power supply device are used to achieve precise charging control. When the SOC is consistent, series charging or parallel charging is selected according to whether the power supply device is high-voltage; when the SOC is inconsistent, the low-SOC battery pack is synchronously charged. In this way, the charging efficiency can be improved, the power can be balanced, the service life of the battery can be prolonged, and the charging safety can be ensured.

[0133] In some possible implementation manners, the battery pack control method provided by the present disclosure can further include: When the battery pack is not in a charging condition or a discharging condition, if the SOC of each battery pack is different, the battery pack with a SOC greater than a second SOC threshold is controlled to charge the battery pack with a SOC less than the second SOC threshold.

[0134] For example, the second SOC threshold can be the average value of the SOC of each battery pack. When the battery pack is in a static state (i.e., not in a charging condition or a discharging condition), the battery pack with a high SOC is controlled to charge the battery pack with a low SOC, which can effectively balance the power state of each battery pack through internal energy transfer, avoid the inconsistency of the performance of the battery pack caused by too large SOC difference, and improve the service life of the battery pack.

[0135] In some possible implementation manners, the battery pack control method provided by the present disclosure can further include: The minimum SOC of each battery pack is determined as the SOC of the battery pack; The SOC of the battery pack is displayed.

[0136] For example, the SOC of each battery pack can be monitored in real time, the minimum SOC value is selected as the SOC of the entire battery pack, and the SOC of the entire battery pack is directly displayed to the user through an instrument panel or a display screen. For example, if there are three battery packs in the battery pack, and the SOCs of the three battery packs are 80%, 75%, and 70% respectively, the SOC of the battery pack can be displayed as 70%.

[0137] In this way, the power state of the weakest link in the battery pack can be directly reflected, over-discharge can be avoided, accurate power reference can be provided for the user, and the use experience is optimized.

[0138] Based on the same inventive concept, the disclosure also provides a battery pack control device. The battery pack includes a plurality of battery packs, and the life design of at least two battery packs in the plurality of battery packs is different. Figure 8 FIG. 5 is a block diagram of a battery pack control device 500 according to an example embodiment. Referring to FIG. 5, Figure 8 The battery pack control device 500 can include: A first determination module 501 configured to determine a state evaluation parameter of each battery pack when the battery pack discharges to an external load of a device in which the battery pack is located, and the discharge power is greater than a preset power; A second determination module 502 configured to determine a target battery pack based on the state evaluation parameter; A first control module 503 configured to control the target battery pack to discharge.

[0139] In the above technical solution, for a battery pack including battery packs with different life designs, the state of each battery pack is evaluated in real time when the battery pack discharges to an external load of a device in which the battery pack is located, and the discharge power is greater than a preset power, and a target battery pack that is most suitable to undertake the discharge task is accurately selected based on the state evaluation parameter. In this way, the life redundancy can be applied to the scenario where the battery pack discharges to an external load of a device in which the battery pack is located, and the discharge power is greater than a preset power, so that the battery pack with a long life, or the battery pack with a better state, becomes the undertaker of the current discharge task, ensuring the safety and discharge capacity of the discharge, protecting the battery pack with a short life or a poor state, balancing the states of the battery packs, and delaying the overall life attenuation of the battery pack.

[0140] In some possible implementations, the first determination module 501 is configured to determine the state evaluation parameter of each battery pack by: For each battery pack, the state evaluation parameter of the battery pack is determined based on operating data of the battery pack, and the operating data includes at least one of SOH, attenuation rate, number of charge and discharge cycles, and temperature.

[0141] In some possible implementations, the second determination module 502 is configured to determine the target battery pack by: if the state evaluation parameters of the battery packs satisfy the first equalization condition, a preset time length is taken as a rotation period, and each battery pack that is equalized in state is determined as the target battery pack; and / or, if the state evaluation parameters of the battery packs do not satisfy the first equalization condition, a battery pack corresponding to the minimum state evaluation parameter is determined as the target battery pack, where the state evaluation parameter of the battery pack and the battery state are in a negative correlation.

[0142] In some possible implementation manners, the first equalization condition comprises: a difference value of the state evaluation parameter of each battery pack is less than a first difference threshold.

[0143] In some possible implementation manners, the device 500 further comprises: The second control module is configured to, when the battery pack is discharging to an internal load of a device where the battery pack is located or when the battery pack is discharging to an external load and a discharging power is less than or equal to a preset power, and if a whole vehicle demand power is greater than or equal to a power threshold, control the battery pack to discharge according to the SOH values of the battery packs.

[0144] In some possible implementation manners, the second control module is configured to control the battery pack to discharge according to the SOH values of the battery packs in the following manner: if the SOH of each battery pack is greater than or equal to an SOH threshold, control each battery pack to discharge at full power; and / or, if there is a battery pack with an SOH less than the SOH threshold, control each battery pack to discharge according to a corresponding power distribution coefficient, where the SOH of the battery pack and the corresponding power distribution coefficient are in a positive correlation.

[0145] In some possible implementation manners, the device 500 further comprises: The third determination module is configured to determine a sum of the SOH values of the battery packs as a reference value, and determine a ratio of a current battery pack to the reference value as a power distribution coefficient corresponding to the current battery pack.

[0146] In some possible implementation manners, the device 500 further comprises: The third control module is configured to, when the battery pack is discharging to an internal load of a device where the battery pack is located or when the battery pack is discharging to an external load and a discharging power is less than or equal to a preset power, and if a whole vehicle demand power is less than a power threshold, control the battery pack to discharge according to the SOC values of the battery packs.

[0147] In some possible implementation manners, the third control module is configured to control the battery pack to discharge according to the SOC values of the battery packs in the following manner: if the SOC of each battery pack meets the second equalization condition, controlling each battery pack to discharge at the same power; and / or, if the SOC of each battery pack does not meet the second equalization condition, controlling the battery pack with the highest SOC to discharge.

[0148] In some possible implementation manners, the second equalization condition comprises that the difference value of the SOC of each battery pack is less than a second difference threshold.

[0149] In some possible implementation manners, the third control module is further configured to, in the process of controlling the battery pack with the highest SOC to discharge, if it is determined that the difference value of the SOC of each battery pack is less than a third difference threshold, control each battery pack to discharge at the same power.

[0150] In some possible implementation manners, the battery pack comprises at least one battery cell, and the device 500 further comprises a life design module. The life design module is configured to realize the differential design of the life of the battery pack by at least one of the following manners: selecting battery cells with different material systems to realize the differential design of the life of the battery pack; selecting battery cells with different energy densities to realize the differential design of the life of the battery pack; selecting battery cells with different application boundaries to realize the differential design of the life of the battery pack, wherein the application boundaries comprise a battery temperature boundary for limiting a temperature range allowed by the battery cell when working, and / or a battery current boundary for limiting a current range allowed by the battery cell when working.

[0151] In some possible implementation manners, the battery cell is provided with a plurality of temperature ranges, and a range corresponding to a greater temperature value represents a greater battery power and a shorter battery cell life; and / or the battery cell is provided with a plurality of current ranges, and a range corresponding to a greater current value represents a greater battery power and a shorter battery cell life.

[0152] In some possible implementation manners, the device 500 further comprises: a fourth control module configured to, when the battery pack is in a charging working condition, if the SOC of each battery pack is consistent, control the battery pack to execute a corresponding charging strategy according to a power supply device.

[0153] In some possible implementation manners, the fourth control module is configured to control the battery pack to execute the corresponding charging strategy according to the power supply device by the following manners: if the power supply device is a high-voltage power supply device, controlling each battery pack to perform series high-voltage charging; and / or, If the power supply device is a normal pressure power supply device, the control is performed on each battery pack to perform parallel normal pressure charging.

[0154] In some possible implementation manners, the apparatus 500 further includes: The fifth control module is configured to, when the battery pack is in the charging working condition, if the SOCs of the battery packs are different, perform synchronous charging on the battery pack with the SOC less than the first SOC threshold.

[0155] In some possible implementation manners, the apparatus 500 further includes: The sixth control module is configured to, when the battery pack is not in the charging working condition or the discharging working condition, if the SOCs of the battery packs are different, control the battery pack with the SOC greater than the second SOC threshold to charge the battery pack with the SOC less than the second SOC threshold.

[0156] In some possible implementation manners, the apparatus 500 further includes: The display module is configured to determine the minimum SOC of each battery pack as the SOC of the battery pack, and display the SOC of the battery pack.

[0157] As to the apparatus in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments of the method, and thus will not be described in detail here.

[0158] The present disclosure also provides an electronic device, including: A battery pack including a plurality of battery packs, at least two battery packs in the plurality of battery packs having different designed lifespans; A processor; A memory for storing processor-executable instructions; The processor is configured to execute the executable instructions in the memory to implement the steps of the battery pack control method provided by the present disclosure.

[0159] Figure 9 is a block diagram of a vehicle 600 according to an example embodiment. For example, the vehicle 600 can be a hybrid vehicle, or a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other type of vehicle. The vehicle 600 can be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0160] Referring to Figure 9The vehicle 600 can include various subsystems, such as an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. The vehicle 600 can include more or fewer subsystems, and each subsystem can include multiple components.

[0161] The battery pack includes a plurality of battery packs, and at least two of the plurality of battery packs have different designed lifespans.

[0162] In some embodiments, the infotainment system 610 can include a communication system, an entertainment system, a navigation system, and the like.

[0163] The perception system 620 can include a number of sensors for sensing information about the environment surrounding the vehicle 600. For example, the perception system 620 can include a global positioning system (which can be a GPS system, a Beidou system, or another positioning system), an inertial measurement unit (IMU), a lidar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0164] The decision control system 630 can include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0165] The drive system 640 can include components that provide the vehicle 600 with power for movement. In one embodiment, the drive system 640 can include an engine, an energy source, a transmission system, and wheels. The engine can be one or a combination of an internal combustion engine, an electric motor, an air compression engine, or the like. The engine can convert energy provided by the energy source into mechanical energy.

[0166] Some or all of the functions of the vehicle 600 are controlled by the computing platform 650. The computing platform 650 can include at least one processor 651 and a memory 652, and the processor 651 can execute instructions 653 stored in the memory 652.

[0167] The processor 651 can be any conventional processor, such as commercially available CPUs. The processor can also include a graphics processing unit (GPU), a field programmable gate array (FPGA), a system on chip (SOC), an application specific integrated circuit (ASIC), or a combination thereof.

[0168] Memory 652 can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0169] In addition to instructions 653, memory 652 can store data such as road maps, route information, vehicle's position, direction, speed, etc. The data stored in memory 652 can be used by computing platform 650.

[0170] In embodiments of the present disclosure, processor 651 can execute instructions 653 to complete all or part of the steps of the battery pack control method described above.

[0171] The present disclosure also provides a computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the battery pack control method provided by the present disclosure.

[0172] The present disclosure also provides a computer program product containing a computer program capable of being executed by a programmable device, the computer program having code portions for executing the battery pack control method described above when executed by the programmable device.

[0173] Those skilled in the art can appreciate that the various illustrative logical blocks and steps listed in the embodiments of the present disclosure can be implemented by electronic hardware, computer software, or a combination thereof. Whether the functions are implemented by hardware or software depends on the specific application and design requirements of the overall system. Those skilled in the art can use various methods to implement the functions for each specific application, but such implementation should not be interpreted as beyond the scope of the embodiments of the present disclosure.

[0174] Also, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, use of the word exemplary is intended to present concepts in a concrete manner. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied under any of the foregoing instances. In addition, the articles "a" and "an" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form. Thus, use of the articles in this application and the appended claims is not limiting.

[0175] Also, although the disclosure has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon the foregoing description and illustrations. The disclosure is to be limited only by the scope of the following claims, including any equivalents thereof. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms used to describe such components are intended to correspond, unless otherwise indicated or clear from the context, to any component which performs the described function of the component (e.g., that is functional equivalent), even if not structurally equivalent to the disclosed structure. In addition, although a particular feature of the disclosure can have been disclosed with respect to only one of several implementations, other implementations can include the particular feature. For example, the disclosure can be implemented with respect to other implementations that incorporate the particular feature, and that implementations that do not include the particular feature. Further, although a feature can have been disclosed with respect to only one of several implementations, such feature can be combined with one or more of the other implementations. Also, to the extent that "comprising", "including", "carrying", "having", "front", or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0176] Although terms such as "first", "second", and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to the terms. Instead, the terms are only used to distinguish one component, part, region, layer or section from another component, part, region, layer or section. Thus, the first component, part, region, layer or section mentioned in the examples described herein can also be called the second component, part, region, layer or section without departing from the teachings of the examples. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description herein, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0177] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including such departures from the present disclosure that come within known use or custom in the art. The specification and examples are to be regarded as illustrative only and the true scope and spirit of the present disclosure is indicated by the appended claims.

[0178] It should be understood that the present disclosure is not limited to the precise structures as herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the claims appended hereto.

Claims

1. A battery pack control method, characterized in that, The battery pack includes multiple battery groups, at least two of which have different lifespan designs. The method includes: When the battery pack discharges to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power, the state evaluation parameters of each battery pack are determined. The target battery pack is determined based on the aforementioned state assessment parameters; Control the target battery pack to discharge.

2. The method according to claim 1, characterized in that, The determination of the state assessment parameters for each battery pack includes: For each of the battery packs, the state assessment parameters of the battery pack are determined based on the operating data of the battery pack, wherein the operating data includes at least one of SOH decay rate, charge-discharge cycle count and temperature.

3. The method according to claim 1, characterized in that, Based on the aforementioned state assessment parameters, the target battery pack is determined, including: If the state evaluation parameters of each battery pack meet the first equilibrium condition, then a preset time period is used as the rotation cycle, and the battery packs that are in state equilibrium are rotated and determined as the target battery pack; and / or, If the state evaluation parameters of each battery pack do not meet the first equilibrium condition, then the battery pack corresponding to the minimum state evaluation parameter is determined as the target battery pack, wherein the state evaluation parameters of the battery pack and the battery state are negatively correlated.

4. The method according to claim 3, characterized in that, The first equilibrium condition includes: the difference values ​​of the state assessment parameters of each battery pack are all less than the first difference threshold.

5. The method according to claim 1, characterized in that, The method further includes: When the battery pack discharges to the internal load of the device in which the battery pack is located, or when the battery pack discharges to the external load and the discharge power is less than or equal to the preset power, if the power demand of the whole vehicle is greater than or equal to the power threshold, the battery pack discharge is controlled according to the SOH value of each battery pack.

6. The method according to claim 5, characterized in that, The step of controlling the discharge of the battery pack based on the SOH value of each battery group includes: If the state of harm (SOH) of each battery pack is greater than or equal to the SOH threshold, then each battery pack is controlled to discharge at full power; and / or, If there are battery packs with SOH less than the SOH threshold, then each battery pack is controlled to discharge according to the corresponding power allocation coefficient, wherein the SOH of the battery pack and the corresponding power allocation coefficient are positively correlated.

7. The method according to claim 6, characterized in that, The method further includes: The sum of the SOH values ​​of each battery pack is determined as a reference value; The ratio of the current battery pack to the reference value is determined as the power distribution coefficient corresponding to the current battery pack.

8. The method according to claim 1, characterized in that, The method further includes: When the battery pack discharges to the internal load of the device where the battery pack is located, or when the battery pack discharges to the external load and the discharge power is less than or equal to the preset power, if the power required by the whole vehicle is less than the power threshold, the battery pack discharge is controlled according to the SOC value of each battery pack.

9. The method according to claim 8, characterized in that, The step of controlling the discharge of the battery pack based on the SOC value of each battery group includes: If the SOC of each battery pack meets the second equalization condition, then control each battery pack to discharge at the same power; and / or, If the SOC of each battery pack does not meet the second equalization condition, then the battery pack with the highest SOC will be controlled to discharge.

10. The method according to claim 9, characterized in that, The second equilibrium condition includes: the difference in SOC of each battery pack is less than the second difference threshold.

11. The method according to claim 9, characterized in that, The method further includes: During the process of controlling the discharge of the battery pack with the highest SOC, if it is determined that the difference in SOC between each battery pack is less than the third difference threshold, then each battery pack is controlled to discharge at the same power.

12. The method according to claim 1, characterized in that, The battery pack includes at least one battery cell, and the method further includes: Differential design of battery pack lifespan can be achieved through at least one of the following methods: Different battery cells with different material systems can be selected to achieve different designs for battery pack lifespan; Different energy density battery cells are selected to achieve different designs for battery pack life; By selecting battery cells with different application boundaries, the battery pack life can be designed differently. The application boundaries include battery temperature boundaries and / or battery current boundaries. The battery temperature boundaries are used to limit the allowable temperature range when the battery cell is working, and the battery current boundaries are used to limit the allowable current range when the battery cell is working.

13. The method according to claim 12, characterized in that, The battery cell is configured with multiple temperature ranges, where a higher temperature range corresponds to a higher battery power and a shorter battery cell lifespan; and / or, the battery cell is configured with multiple current ranges, where a higher current range corresponds to a higher battery power and a shorter battery cell lifespan.

14. The method according to claim 1, characterized in that, The method further includes: When the battery pack is in charging mode, if the SOC of each battery pack is the same, the power supply equipment controls the battery pack to execute the corresponding charging strategy.

15. The method according to claim 14, characterized in that, The step of controlling the battery pack to execute a corresponding charging strategy based on the power supply equipment includes: If the power supply equipment is a high-voltage power supply equipment, then control each battery pack to be charged in series with high voltage; and / or, If the power supply equipment is a normal pressure power supply equipment, then control each battery pack to perform parallel normal pressure charging.

16. The method according to claim 1, characterized in that, The method further includes: The minimum SOC of each battery pack is determined as the SOC of the battery pack; This displays the SOC of the battery pack.

17. A battery pack control device, characterized in that, The battery pack includes multiple battery groups, at least two of which have different lifespan designs. The device includes: The first determining module is used to determine the state evaluation parameters of each battery pack when the battery pack discharges to the external load of the device where the battery pack is located, and the discharge power is greater than the preset power. The second determining module is used to determine the target battery pack based on the state evaluation parameters; The first control module is used to control the target battery pack to discharge.

18. The apparatus according to claim 17, characterized in that, The first determining module is used to determine the state evaluation parameters of each battery pack in the following manner: For each of the battery packs, the state assessment parameters of the battery pack are determined based on the operating data of the battery pack, wherein the operating data includes at least one of SOH, degradation rate, charge-discharge cycle count and temperature.

19. The apparatus according to claim 17, characterized in that, The second determining module is used to determine the target battery pack in the following ways: If the state evaluation parameters of each battery pack meet the first equilibrium condition, then the preset time period is used as the rotation cycle, and the battery packs with balanced state are rotated to determine the target battery pack. And / or, If the state evaluation parameters of each battery pack do not meet the first equilibrium condition, then the battery pack corresponding to the minimum state evaluation parameter is determined as the target battery pack, wherein the state evaluation parameters of the battery pack and the battery state are negatively correlated.

20. The apparatus according to claim 17, characterized in that, The device further includes: The second control module is used to control the battery pack to discharge according to the SOH value of each battery pack when the battery pack discharges to the internal load of the device where the battery pack is located, or when the battery pack discharges to the external load and the discharge power is less than or equal to a preset power, if the power demand of the whole vehicle is greater than or equal to a power threshold.

21. The apparatus according to claim 17, characterized in that, The device further includes: The third control module is used to control the battery pack to discharge according to the SOC value of each battery pack when the battery pack discharges to the internal load of the device where the battery pack is located, or when the battery pack discharges to the external load and the discharge power is less than or equal to the preset power, if the power demand of the whole vehicle is less than the power threshold.

22. An electronic device, characterized in that, include: A battery pack, comprising multiple battery groups, wherein at least two of the multiple battery groups have different lifespan designs; processor; Memory used to store processor-executable instructions; The processor is configured to execute the executable instructions in the memory to implement the steps of the battery pack control method according to any one of claims 1-16.

23. A vehicle, characterized in that, Including the electronic device as described in claim 22.

24. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the battery pack control method according to any one of claims 1-16.

25. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the steps of the battery pack control method according to any one of claims 1-16.

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