Multi-branch parallel battery pack recharging working condition circulation control method, device and equipment and storage medium

Abstract

The invention discloses a multi-branch parallel battery pack recharging working condition circulation control method, device and equipment and a storage medium, and relates to the technical field of battery management, and the multi-branch parallel battery pack recharging working condition circulation control method comprises the steps: detecting the recharging working condition duration of a multi-branch parallel battery pack; when the duration of the recharging working condition is greater than a preset duration, determining a recharging current limit according to a recharging current difference value between branches, a maximum allowable recharging current, the highest monomer voltage of the branch with the maximum recharging current and the number of the branches; and when the duration of the recharging working condition is not greater than a preset duration, performing thermal management on the battery pack according to the recharging current difference between the branches and the highest monomer voltage of the branch with the maximum recharging current to complete the circulation control of the recharging working condition. The circulating current influence caused by the end of the recharging working condition can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a method, device, equipment and storage medium for controlling circulating current in a recharging condition of a multi-branch parallel battery pack. Background Art

[0002] As the demand for battery life of electric vehicles increases, the capacity of battery packs continues to increase, and the multi-pack solution is increasingly becoming one of the technical options. Among them, the multi-pack parallel solution is the first choice for the automotive industry because it is compatible with other electrical appliances in the vehicle and does not require major adjustments to the vehicle. Affected by the process, there are differences in the internal resistance of the battery pack branches. After the high-current recharging is completed, a large voltage difference is easily generated between different branches, which in turn generates a large circulation current between the branches. In severe cases, it will cause over-discharge of the battery cells, causing irreversible damage.

[0003] At present, the voltage difference between different branches after the recharging is reduced by querying a table composed of real-time battery status parameters to adjust the size of the allowed recharging current. However, for multi-branch battery packs, once the high-current recharging condition suddenly ends at a low charge state, it is easy to cause a voltage difference between the branches, which in turn causes a large circulating current. Therefore, how to reduce the impact of the circulating current caused by the end of the recharging condition is a problem that still needs to be solved.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide a method, device, equipment and storage medium for controlling circulating current in a multi-branch parallel battery pack recharging condition, aiming to solve the technical problem of how to reduce the impact of circulating current caused by the end of the recharging condition.

[0006] To achieve the above objectives, the present application proposes a method for controlling circulating current in a multi-branch parallel battery pack recharging condition, the method comprising:

[0007] Detect the duration of the recharging condition of multi-branch parallel battery packs;

[0008] When the duration of the recharging condition is longer than a preset duration, the recharging current limit is determined according to the recharging current difference between the branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches;

[0009] When the recharging condition lasts for no longer than a preset time, the recharging condition circulation control is completed by thermally managing the battery pack according to the recharging current difference between the branches and the highest single cell voltage of the branch with the largest recharging current.

[0010] In one embodiment, the step of determining the recharge current limit according to the recharge current difference between branches, the maximum allowable recharge current, the highest single cell voltage of the branch with the maximum recharge current, and the number of branches includes:

[0011] Obtain the maximum allowable recharge current, the highest single cell voltage of the branch with the largest recharge current, and the number of branches;

[0012] Detecting a maximum recharge current and a minimum recharge current between branches, and obtaining a recharge current difference between branches according to the maximum recharge current and the minimum recharge current;

[0013] Determine a single current reduction amount according to the product of the number of branches and a preset current value;

[0014] When the highest single cell voltage is less than the first preset voltage, the maximum recharge current is reduced according to the single current reduction amount until the recharge current difference between the branches meets the preset requirement, and the reduced maximum recharge current is determined as the recharge current limit.

[0015] In one embodiment, when the highest cell voltage is less than the first preset voltage, the maximum recharge current is reduced according to the single current reduction amount until the recharge current difference between the branches meets the preset requirement, and the step of determining the reduced maximum recharge current as the recharge current limit includes:

[0016] Subtract the single current reduction amount from the maximum recharge current to obtain a pending recharge current limit;

[0017] In the case where the highest single cell voltage is less than the first preset voltage, the recharge current difference between the branches and the recharge duration are periodically detected. When it is detected that the recharge current difference between the branches is greater than the preset current difference and the recharge duration is greater than the preset duration, the undetermined recharge current limit is again reduced by the current single reduction amount.

[0018] When it is detected that the recharge current difference between the branches is not greater than the preset current difference or the recharge duration is not greater than the preset duration, the pending recharge current limit is determined as the recharge current limit.

[0019] In one embodiment, after the step of subtracting the single current reduction amount from the maximum recharge current to obtain the pending recharge current limit, the method further includes:

[0020] detecting the highest single cell voltage;

[0021] When the highest cell voltage is not less than the first preset voltage, the recharge current limit is adjusted to zero.

[0022] In one embodiment, the step of completing the recharging condition circulating current control by thermally managing the battery pack according to the recharging current difference between the branches and the highest cell voltage of the branch with the largest recharging current includes:

[0023] Obtain the maximum allowable recharge current and the highest single cell voltage of the branch with the largest recharge current;

[0024] Detecting a maximum recharge current and a minimum recharge current between branches, and obtaining a recharge current difference between branches according to the maximum recharge current and the minimum recharge current;

[0025] When the highest single cell voltage is greater than the second preset voltage, thermal management of the battery pack is performed according to the recharge current difference to complete the recharge condition circulating current control.

[0026] In one embodiment, the step of performing thermal management on the battery pack according to the recharge current difference to complete the recharge condition circulating current control includes:

[0027] Comparing the recharge current difference with a preset current difference, and determining a thermal management strategy according to the comparison result;

[0028] The maximum single cell voltage and the recharge current difference are periodically detected. When the maximum single cell voltage is not less than a third preset voltage, the thermal management strategy is adjusted again according to the comparison result of the recharge current difference and the preset current difference, until the maximum single cell voltage is less than the third preset voltage, and the thermal management state is released, wherein the third preset voltage is less than the second preset voltage.

[0029] In one embodiment, the step of comparing the recharge current difference with the preset current difference and determining the thermal management strategy according to the comparison result includes:

[0030] When the recharge current difference is greater than a preset current difference, determining a thermal management strategy for heating the battery pack;

[0031] When the recharge current difference is not greater than the preset current difference, a thermal management strategy for cooling the battery pack is determined.

[0032] In addition, to achieve the above-mentioned purpose, the present application also proposes a multi-branch parallel battery pack recharging condition circulation control device, the multi-branch parallel battery pack recharging condition circulation control device comprising:

[0033] A status detection module is used to detect the duration of the recharging condition of a multi-branch parallel battery pack;

[0034] A first determination module is used to determine the recharge current limit according to the recharge current difference between branches, the maximum allowable recharge current, the highest single cell voltage of the branch with the largest recharge current, and the number of branches when the recharge condition lasts longer than a preset time;

[0035] The second determination module is used to complete the recharging condition circulation control by performing thermal management on the battery pack based on the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current when the recharging condition lasts for no longer than a preset time.

[0036] In addition, to achieve the above-mentioned purpose, the present application also proposes a multi-branch parallel battery pack recharging operating condition circulation control device, the device comprising: 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 multi-branch parallel battery pack recharging operating condition circulation control method as described above.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the multi-branch parallel battery pack recharging condition circulation control method as described above are implemented.

[0038] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the multi-branch parallel battery pack recharging condition circulation control method as described above.

[0039] The present application provides a method for controlling a circulating current under a recharging condition of a multi-branch parallel battery pack. The present application detects the duration of a recharging condition of a multi-branch parallel battery pack. When the duration of the recharging condition is greater than a preset duration, the recharging current limit is determined based on the recharging current difference between branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches. When the duration of the recharging condition is not greater than the preset duration, the recharging condition circulating current control is completed by performing thermal management on the battery pack based on the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current.

[0040] In summary, the present application solves the technical problem of how to reduce the impact of the circulating current caused by the end of the recharging condition by implementing a circulating current control strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 A flow chart of a first embodiment of a method for controlling circulating current in a multi-branch parallel battery pack recharging condition;

[0044] Figure 2 A flow chart of a second embodiment of a method for controlling circulating current in a multi-branch parallel battery pack recharging condition;

[0045] Figure 3 A flow chart of a third embodiment of the method for controlling circulating current in a multi-branch parallel battery pack recharging condition;

[0046] Figure 4 This is a schematic diagram of the module structure of a circulating current control device for a multi-branch parallel battery pack recharging condition according to an embodiment of the present application;

[0047] Figure 5 Schematic diagram of the equipment structure of the hardware operating environment involved in the circulation control method for recharging a multi-branch parallel battery pack in an embodiment of the present application.

[0048] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0050] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0051] The main solution of the present application is to detect the duration of the recharging condition of a multi-branch parallel battery pack; when the recharging condition lasts longer than a preset time, the recharging current limit is determined based on the recharging current difference between branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches; when the recharging condition lasts no longer than a preset time, the recharging condition circulation control is completed by performing thermal management of the battery pack based on the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current.

[0052] At present, the voltage difference between different branches after the recharging is reduced by querying a table composed of real-time battery status parameters to adjust the size of the allowed recharging current. However, for multi-branch battery packs, once the high-current recharging condition suddenly ends at a low charge state, it is easy to cause a voltage difference between the branches, which in turn causes a large circulating current. Therefore, how to reduce the impact of the circulating current caused by the end of the recharging condition is a problem that still needs to be solved.

[0053] The present application reduces the impact of circulating current caused by the end of the recharging condition by implementing a circulating current control strategy.

[0054] Based on this, the embodiment of the present application provides a method for controlling the circulating current of a multi-branch parallel battery pack under recharging conditions, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the circulating current control method for a multi-branch parallel battery pack recharging condition of the present application.

[0055] In this embodiment, the method for controlling the circulating current of a multi-branch parallel battery pack recharging condition includes steps S10 to S30:

[0056] Step S10: Detecting the duration of the recharging condition of the multi-branch parallel battery pack;

[0057] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a multi-branch parallel battery pack recharging condition circulation control device, etc. The following takes the multi-branch parallel battery pack recharging condition circulation control device as an example to illustrate this embodiment and the following embodiments.

[0058] It should be noted that a multi-branch parallel battery pack refers to connecting multiple battery packs in parallel to form a battery pack with a larger total capacity and capable of providing more current;

[0059] Step S20: when the duration of the recharging condition is longer than a preset duration, determining the recharging current limit according to the recharging current difference between the branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches;

[0060] It is understandable that the preset duration can be determined based on actual conditions. For example, 20 seconds is the preset duration. When the recharging condition lasts for more than 20 seconds, the recharging current difference between branches, the maximum allowable recharging current, the highest single-cell voltage of the branch with the largest recharging current, and the number of branches are used.

[0061] Step S30: When the duration of the recharging condition is not greater than the preset duration, the recharging condition circulation control is completed by thermally managing the battery pack according to the recharging current difference between the branches and the highest single cell voltage of the branch with the largest recharging current.

[0062] It is understandable that when the recharging condition lasts no longer than 20 seconds, the recharging condition circulation control is completed by thermally managing the battery pack through the recharging current difference between branches, the highest single cell voltage of the branch with the largest recharging current.

[0063] The present embodiment detects the duration of the recharging condition of a multi-branch parallel battery pack; when the duration of the recharging condition is greater than a preset duration, the recharging current limit is determined based on the recharging current difference between branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches; when the duration of the recharging condition is not greater than the preset duration, the recharging condition circulation control is completed by performing thermal management on the battery pack based on the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current.

[0064] In summary, this embodiment reduces the impact of the circulating current caused by the end of the recharging condition by implementing the circulating current control strategy.

[0065] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 2 , step S20 includes steps S201 to S204:

[0066] Step S201: obtaining the maximum allowable recharge current, the maximum single cell voltage of the branch with the maximum recharge current, and the number of branches;

[0067] It should be noted that the maximum allowable recharge current is obtained by querying a data table composed of the real-time status parameters of the battery (such as voltage, current, temperature, SOC, etc.). The allowable recharge current in the data table is obtained by testing the battery cell without lithium deposition as the boundary condition, and is the maximum limit recharge current allowed by the battery pack.

[0068] Step S202: Detecting a maximum recharge current and a minimum recharge current between branches, and obtaining a recharge current difference between branches according to the maximum recharge current and the minimum recharge current;

[0069] It can be understood that the recharge current difference is the maximum recharge current minus the minimum recharge current.

[0070] Step S203: determining a single current reduction amount according to the product of the number of branches and a preset current value;

[0071] Taking the preset current value of 20A as an example, the single current reduction amount is 20 multiplied by the number of branches.

[0072] Step S204: when the highest single cell voltage is less than the first preset voltage, the maximum recharge current is reduced according to the single current reduction amount until the recharge current difference between the branches meets the preset requirement, and the reduced maximum recharge current is determined as the recharge current limit.

[0073] It is understandable that the first preset voltage is determined according to actual conditions, for example, the first preset voltage is 3.6V.

[0074] In a feasible manner, when the highest single cell voltage is less than the first preset voltage, the maximum recharge current is reduced according to the single current reduction amount until the recharge current difference between the branches meets the preset requirement, and the step of determining the reduced maximum recharge current as the recharge current limit includes:

[0075] Subtract the single current reduction amount from the maximum recharge current to obtain a pending recharge current limit;

[0076] In the case where the highest single cell voltage is less than the first preset voltage, the recharge current difference between the branches and the recharge duration are periodically detected. When it is detected that the recharge current difference between the branches is greater than the preset current difference and the recharge duration is greater than the preset duration, the undetermined recharge current limit is again reduced by the current single reduction amount.

[0077] When it is detected that the recharge current difference between the branches is not greater than the preset current difference or the recharge duration is not greater than the preset duration, the pending recharge current limit is determined as the recharge current limit.

[0078] It is understandable that when the highest single-cell voltage is less than 3.6V, when it is detected that the recharging current difference between the branches is greater than 20A and the recharging duration is greater than 20 seconds, the result of subtracting the single reduction amount of current from the maximum allowed recharging current is used as the pending recharging current limit, and the detection of the recharging current difference and the recharging duration between the branches is a periodic detection. After adjusting the pending recharging current limit, wait for a period of time, and then detect the recharging current difference and the recharging duration again. If the conditions that the recharging current difference is greater than 20A and the recharging duration is greater than 20 seconds are still met, the pending recharging current limit is again subtracted from the single reduction amount of current until the recharging current difference is not greater than 20A or the recharging duration is not greater than 20 seconds.

[0079] In a feasible manner, after the step of subtracting the single current reduction amount from the maximum recharge current to obtain the pending recharge current limit, the step further includes:

[0080] detecting the highest single cell voltage;

[0081] When the highest cell voltage is not less than the first preset voltage, the recharge current limit is adjusted to zero.

[0082] It is understandable that when the highest cell voltage is not less than 3.6V, the recharge current limit can be directly adjusted to zero, that is, no recharge current is allowed in the branch.

[0083] This embodiment obtains the maximum allowable recharge current, the highest single-cell voltage of the branch with the maximum recharge current, and the number of branches; detects the maximum recharge current and the minimum recharge current between branches, and obtains the recharge current difference between branches based on the maximum recharge current and the minimum recharge current; determines the single current reduction amount based on the product of the number of branches and the preset current value; when the highest single-cell voltage is less than a first preset voltage, reduces the maximum recharge current based on the single current reduction amount until the recharge current difference between the branches meets the preset requirements, and determines the reduced maximum recharge current as the recharge current limit.

[0084] In summary, this embodiment solves the technical problem of how to reduce the impact of the circulating current caused by the end of the recharging condition when the recharging condition is long by continuously reducing the allowable recharging current limit.

[0085] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 3 , step S30 includes steps S301 to S304:

[0086] Step S301: obtaining the maximum allowable recharge current and the highest cell voltage of the branch with the maximum recharge current;

[0087] It should be noted that the maximum allowable recharge current is obtained by querying a data table composed of the real-time status parameters of the battery (such as voltage, current, temperature, SOC, etc.). The allowable recharge current in the data table is obtained by testing the battery cell without lithium deposition as the boundary condition, and is the maximum limit recharge current allowed by the battery pack.

[0088] Step S302: Detecting a maximum recharge current and a minimum recharge current between branches, and obtaining a recharge current difference between branches according to the maximum recharge current and the minimum recharge current;

[0089] It can be understood that the recharge current difference is the maximum recharge current minus the minimum recharge current.

[0090] Step S303: when the highest cell voltage is greater than the second preset voltage, thermal management of the battery pack is performed according to the recharge current difference to complete recharge condition circulating current control;

[0091] It is understandable that, taking 3.6V as an example of the second preset voltage, when the highest cell voltage is greater than 3.6V, the maximum recharge current is reduced according to the recharge current difference to obtain the recharge current limit.

[0092] In a feasible manner, the step of performing thermal management on the battery pack according to the recharge current difference to complete the recharge condition circulating current control includes:

[0093] Comparing the recharge current difference with a preset current difference, and determining a thermal management strategy according to the comparison result;

[0094] The maximum single cell voltage and the recharge current difference are periodically detected. When the maximum single cell voltage is not less than a third preset voltage, the thermal management strategy is adjusted again according to the comparison result of the recharge current difference and the preset current difference, until the maximum single cell voltage is less than the third preset voltage, and the thermal management state is released, wherein the third preset voltage is less than the second preset voltage.

[0095] It is understandable that the third preset voltage is 3.4V as an example, and the third preset voltage is lower than the second preset voltage, and the highest cell voltage is reduced by continuously adjusting the thermal management strategy until the highest cell voltage is lower than 3.4V.

[0096] In a feasible manner, the step of comparing the recharge current difference with the preset current difference and determining the thermal management strategy according to the comparison result includes:

[0097] When the recharge current difference is greater than a preset current difference, determining a thermal management strategy for heating the battery pack;

[0098] When the recharge current difference is not greater than the preset current difference, a thermal management strategy for cooling the battery pack is determined.

[0099] It is understandable that, taking the preset current difference as 20A as an example, when the recharge current difference is greater than 20A, a thermal management strategy for heating the battery pack is determined; when the recharge current difference is not greater than 20A, a thermal management strategy for cooling the battery pack is determined.

[0100] This embodiment obtains the maximum allowable recharge current and the highest single cell voltage of the branch with the maximum recharge current; detects the maximum recharge current and the minimum recharge current between branches, and obtains the recharge current difference between branches based on the maximum recharge current and the minimum recharge current; when the highest single cell voltage is greater than a second preset voltage, thermal management of the battery pack is performed based on the recharge current difference to complete the recharge operating condition circulating current control.

[0101] In summary, this embodiment solves the technical problem of how to reduce the impact of the circulating current caused by the end of the recharging condition when the recharging condition is short by adopting a thermal management strategy of heating or cooling the battery pack.

[0102] This application also provides a multi-branch parallel battery pack recharging condition circulation control device, please refer to Figure 4 The multi-branch parallel battery pack recharging condition circulation control device comprises:

[0103] A state detection module 10 is used to detect the duration of the recharging condition of the multi-branch parallel battery pack;

[0104] The first determination module 20 is used to determine the recharge current limit according to the recharge current difference between branches, the maximum allowable recharge current, the highest single cell voltage of the branch with the largest recharge current, and the number of branches when the recharge condition lasts longer than a preset time;

[0105] The second determination module 30 is used to complete the recharging condition circulation control by performing thermal management on the battery pack according to the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current when the recharging condition lasts for no longer than a preset time.

[0106] The present embodiment detects the duration of the recharging condition of a multi-branch parallel battery pack; when the duration of the recharging condition is greater than a preset duration, the recharging current limit is determined based on the recharging current difference between branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches; when the duration of the recharging condition is not greater than the preset duration, the recharging condition circulation control is completed by performing thermal management on the battery pack based on the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current.

[0107] In summary, this embodiment reduces the impact of the circulating current caused by the end of the recharging condition by implementing the circulating current control strategy.

[0108] In one embodiment, the first determination module 20 is further used to obtain the maximum allowable recharge current, the maximum single-cell voltage of the branch with the maximum recharge current, and the number of branches; detect the maximum recharge current and the minimum recharge current between branches, and obtain the recharge current difference between branches based on the maximum recharge current and the minimum recharge current; determine the single current reduction amount based on the product of the number of branches and the preset current value; when the maximum single-cell voltage is less than the first preset voltage, reduce the maximum recharge current according to the single current reduction amount until the recharge current difference between the branches meets the preset requirements, and determine the reduced maximum recharge current as the recharge current limit.

[0109] In one embodiment, the first determination module 20 is further used to subtract the single current reduction amount from the maximum recharge current to obtain a pending recharge current limit; when the highest single cell voltage is less than a first preset voltage, the recharge current difference and the recharge duration between the branches are periodically detected, and when it is detected that the recharge current difference between the branches is greater than the preset current difference and the recharge duration is greater than the preset duration, the pending recharge current limit is again subtracted from the single current reduction amount; when it is detected that the recharge current difference between the branches is not greater than the preset current difference or the recharge duration is not greater than the preset duration, the pending recharge current limit is determined as the recharge current limit.

[0110] In one embodiment, the first determination module 20 is further configured to detect the highest cell voltage; when the highest cell voltage is not less than the first preset voltage, the recharge current limit is adjusted to zero.

[0111] In one embodiment, the second determination module 30 is further used to obtain the maximum allowable recharge current and the maximum single-cell voltage of the branch with the maximum recharge current; detect the maximum recharge current and the minimum recharge current between branches, and obtain the recharge current difference between branches based on the maximum recharge current and the minimum recharge current; when the maximum single-cell voltage is greater than the second preset voltage, perform thermal management on the battery pack according to the recharge current difference to complete the recharge condition circulating current control.

[0112] In one embodiment, the second determination module 30 is further used to compare the recharge current difference with the preset current difference, and determine the thermal management strategy according to the comparison result; periodically detect the highest single cell voltage and the recharge current difference, and when the highest single cell voltage is not less than a third preset voltage, adjust the thermal management strategy again according to the comparison result between the recharge current difference and the preset current difference, until the highest single cell voltage is less than the third preset voltage, and then release the thermal management state, wherein the third preset voltage is less than the second preset voltage.

[0113] In one embodiment, the second determination module 30 is further used to determine a thermal management strategy for heating the battery pack when the recharge current difference is greater than a preset current difference; and to determine a thermal management strategy for cooling the battery pack when the recharge current difference is not greater than the preset current difference.

[0114] The multi-branch parallel battery pack recharging condition circulation control device provided in the present application adopts the multi-branch parallel battery pack recharging condition circulation control method in the above-mentioned embodiment, which can solve the technical problem of how to reduce the influence of the circulating current caused by the end of the recharging condition. Compared with the prior art, the beneficial effects of the multi-branch parallel battery pack recharging condition circulation control device provided in the present application are the same as the beneficial effects of the multi-branch parallel battery pack recharging condition circulation control method provided in the above-mentioned embodiment, and the other technical features in the multi-branch parallel battery pack recharging condition circulation control device are the same as the features disclosed in the above-mentioned embodiment method, which will not be repeated here.

[0115] The present application provides a multi-branch parallel battery pack recharging condition circulation control device, and the multi-branch parallel battery pack recharging condition circulation control device 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 so that the at least one processor can execute the multi-branch parallel battery pack recharging condition circulation control method in the above-mentioned embodiment one.

[0116] Reference below Figure 5 , which shows a schematic diagram of the structure of a multi-branch parallel battery pack recharging condition circulation control device suitable for implementing the embodiment of the present application. The multi-branch parallel battery pack recharging condition circulation control device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The multi-branch parallel battery pack recharging condition circulation control device shown is only an example and should not bring any limitation to the function and scope of use of the embodiments of the present application.

[0117] like Figure 5As shown, the multi-branch parallel battery pack recharging condition circulation control device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM: Read Only Memory) 1002 or the program loaded from the storage device 1003 to the random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the multi-branch parallel battery pack recharging condition circulation control device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. The input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 can allow the multi-branch parallel battery pack recharging condition circulation control device to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a multi-branch parallel battery pack recharging condition circulation control device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have alternatively.

[0118] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0119] The multi-branch parallel battery pack recharging condition circulation control device provided in the present application adopts the multi-branch parallel battery pack recharging condition circulation control method in the above embodiment, which can solve the technical problem of how to reduce the impact of the circulating current caused by the end of the recharging condition. Compared with the prior art, the beneficial effects of the multi-branch parallel battery pack recharging condition circulation control device provided in the present application are the same as the beneficial effects of the multi-branch parallel battery pack recharging condition circulation control method provided in the above embodiment, and the other technical features of the multi-branch parallel battery pack recharging condition circulation control device are the same as the features disclosed in the previous embodiment method, which will not be repeated here.

[0120] It should be understood that the various parts disclosed in this application can be implemented by 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 one or more embodiments or examples in a suitable manner.

[0121] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0122] The present application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, and the computer-readable program instructions are used to execute the circulation control method for recharging operating conditions of a multi-branch parallel battery pack in the above-mentioned embodiment.

[0123] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. 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 combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0124] The above-mentioned computer-readable storage medium may be included in the multi-branch parallel battery pack recharging condition circulation control device; or it may exist independently without being assembled into the multi-branch parallel battery pack recharging condition circulation control device.

[0125] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the multi-branch parallel battery pack recharging condition circulation control device, the multi-branch parallel battery pack recharging condition circulation control device: detects the duration of the recharging condition of the multi-branch parallel battery pack; when the duration of the recharging condition is greater than the preset duration, determines the recharging current limit according to the recharging current difference between branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches; when the duration of the recharging condition is not greater than the preset duration, completes the recharging condition circulation control by performing thermal management on the battery pack according to the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current.

[0126] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0127] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0128] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0129] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned multi-branch parallel battery pack recharging condition circulation control method, and can solve the technical problem of how to reduce the impact of the circulating current caused by the end of the recharging condition. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the multi-branch parallel battery pack recharging condition circulation control method provided in the above-mentioned embodiment, and will not be repeated here.

[0130] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the above-mentioned method for controlling circulating current in a recharging condition of a multi-branch parallel battery pack.

[0131] The computer program product provided in this application can solve the technical problem of how to reduce the impact of circulating current caused by the end of the recharging condition. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the multi-branch parallel battery pack recharging condition circulating current control method provided in the above embodiment, which will not be repeated here.

[0132] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for controlling circulating current in a multi-branch parallel battery pack recharging condition, characterized in that: The method includes: Detect the duration of the recharging condition of multi-branch parallel battery packs; When the duration of the recharging condition is longer than a preset duration, the recharging current limit is determined according to the recharging current difference between the branches, the maximum allowable recharging current, the highest single cell voltage of the branch with the largest recharging current, and the number of branches; When the recharging condition lasts for no longer than a preset time, the recharging condition circulation control is completed by thermally managing the battery pack according to the recharging current difference between the branches and the highest single cell voltage of the branch with the largest recharging current.

2. The method according to claim 1, characterized in that The step of determining the recharge current limit according to the recharge current difference between branches, the maximum allowable recharge current, the highest single cell voltage of the branch with the maximum recharge current, and the number of branches includes: Obtain the maximum allowable recharge current, the highest single cell voltage of the branch with the largest recharge current, and the number of branches; Detecting a maximum recharge current and a minimum recharge current between branches, and obtaining a recharge current difference between branches according to the maximum recharge current and the minimum recharge current; Determine a single current reduction amount according to the product of the number of branches and a preset current value; When the highest single cell voltage is less than the first preset voltage, the maximum recharge current is reduced according to the single current reduction amount until the recharge current difference between the branches meets the preset requirement, and the reduced maximum recharge current is determined as the recharge current limit.

3. The method according to claim 2, characterized in that When the highest cell voltage is less than the first preset voltage, the maximum recharge current is reduced according to the single current reduction amount until the recharge current difference between the branches meets the preset requirement, and the reduced maximum recharge current is determined as the recharge current limit, comprising: Subtract the single current reduction amount from the maximum recharge current to obtain a pending recharge current limit; In the case where the highest single cell voltage is less than the first preset voltage, the recharge current difference between the branches and the recharge duration are periodically detected. When it is detected that the recharge current difference between the branches is greater than the preset current difference and the recharge duration is greater than the preset duration, the undetermined recharge current limit is again reduced by the current single reduction amount. When it is detected that the recharge current difference between the branches is not greater than the preset current difference or the recharge duration is not greater than the preset duration, the pending recharge current limit is determined as the recharge current limit.

4. The method according to claim 3, characterized in that After the step of subtracting the single current reduction amount from the maximum recharge current to obtain the pending recharge current limit, the method further includes: detecting the highest single cell voltage; When the highest cell voltage is not less than the first preset voltage, the recharge current limit is adjusted to zero.

5. The method according to claim 1, characterized in that The step of completing the recharging condition circulating current control by thermally managing the battery pack according to the recharging current difference between the branches and the highest single cell voltage of the branch with the largest recharging current comprises: Obtain the maximum allowable recharge current and the highest single cell voltage of the branch with the largest recharge current; Detecting a maximum recharge current and a minimum recharge current between branches, and obtaining a recharge current difference between branches according to the maximum recharge current and the minimum recharge current; When the highest single cell voltage is greater than the second preset voltage, thermal management of the battery pack is performed according to the recharge current difference to complete the recharge condition circulating current control.

6. The method according to claim 5, characterized in that The step of thermally managing the battery pack according to the recharge current difference to complete the recharge condition circulating current control comprises: Comparing the recharge current difference with a preset current difference, and determining a thermal management strategy according to the comparison result; The maximum single cell voltage and the recharge current difference are periodically detected. When the maximum single cell voltage is not less than a third preset voltage, the thermal management strategy is adjusted again according to the comparison result of the recharge current difference and the preset current difference, until the maximum single cell voltage is less than the third preset voltage, and the thermal management state is released, wherein the third preset voltage is less than the second preset voltage.

7. The method according to claim 6, characterized in that The step of comparing the recharge current difference with the preset current difference and determining the thermal management strategy according to the comparison result comprises: When the recharge current difference is greater than a preset current difference, determining a thermal management strategy for heating the battery pack; When the recharge current difference is not greater than the preset current difference, a thermal management strategy for cooling the battery pack is determined.

8. A circulating current control device for a multi-branch parallel battery pack recharging condition, characterized in that: The device comprises: A status detection module is used to detect the duration of the recharging condition of a multi-branch parallel battery pack; A first determination module is used to determine the recharge current limit according to the recharge current difference between branches, the maximum allowable recharge current, the highest single cell voltage of the branch with the largest recharge current, and the number of branches when the recharge condition lasts longer than a preset time; The second determination module is used to complete the recharging condition circulation control by performing thermal management on the battery pack based on the recharging current difference between branches and the highest single cell voltage of the branch with the largest recharging current when the recharging condition lasts for no longer than a preset time.

9. A multi-branch parallel battery pack recharging condition circulation control device, characterized in that: The device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the method for controlling circulating current in recharging conditions of a multi-branch parallel battery pack as described in any one of claims 1 to 7.

10. 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, the steps of the method for controlling the circulating current of a multi-branch parallel battery pack recharging condition as described in any one of claims 1 to 7 are implemented.

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