OTA regulation and control strategy and maintenance method and device for abnormal voltage difference of battery cell

Abstract

According to the OTA regulation and control strategy and the maintenance method and device for the battery cell voltage difference abnormity, under the condition that a battery management system monitors that the battery cell voltage difference abnormity of a battery is abnormal, the lithium precipitation boundary of the battery is fitted through a cloud end corresponding to the battery management system according to the basic information of the battery and the state of charge of the battery, and then the lithium precipitation boundary of the battery and the initial lithium precipitation boundary of the battery are calculated. Calculating a lithium precipitation boundary coefficient; sending the lithium precipitation boundary coefficient and the voltage difference slowing down mode instruction to a battery management system through an OTA (Over The Air) technology; the battery management system calculates the target instantaneous charging current of the residual battery charge state according to the lithium precipitation boundary coefficient, and performs battery fast charging regulation and control by combining the fast charging cut-off voltage; a signal indicating that the voltage difference of the battery cell is abnormal is sent to a service management platform of the battery through the OTA, and after maintenance, the OTA issues an instruction of quitting the mode of slowing down the voltage difference of the battery cell. Therefore, when the voltage difference of the battery cell is abnormal, an instruction and a signal are issued through the OTA, the degradation of the voltage difference problem of the battery cell is slowed down, and non-inductive maintenance of the voltage difference of the battery cell is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to an OTA regulation strategy, a maintenance method and a device for abnormal cell voltage difference of a battery cell. Background Art

[0002] During the use of a battery, it is inevitable that the problem of abnormal cell voltage difference occurs. If the voltage difference between the individual battery cells in a battery pack shows a serious abnormality and is not processed, it will directly affect the health and lifespan of the battery pack. Therefore, it is very important to regulate and maintain the voltage difference between the battery cells in the battery pack. In related technologies, for a large abnormal voltage difference between the battery cells in a battery pack, an abnormal voltage difference diagnosis is set. After the abnormality is reported, the after-sales service unpacks and balances the battery pack, which is easily perceived by customers, and the abnormal processing mode affects the vehicle use experience. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0004] To this end, the first object of the present invention is to propose an OTA regulation strategy and a maintenance method for abnormal cell voltage difference, which issue a command and signal for a mode of slowing down the cell voltage difference through OTA when the cell voltage difference is abnormal, slow down the deterioration of the cell voltage difference problem, and complete the maintenance of the cell voltage difference without being perceived by the user.

[0005] The second object of the present invention is to propose an OTA regulation strategy and a maintenance device for abnormal cell voltage difference.

[0006] The third object of the present invention is to propose an electronic device.

[0007] The fourth object of the present invention is to propose a non-transitory computer-readable storage medium storing computer instructions.

[0008] To achieve the above object, the first aspect embodiment of the present invention proposes an OTA regulation strategy and a maintenance method for abnormal cell voltage difference, and the method includes:

[0009] When the battery management system monitors that the cell voltage difference of the battery is abnormal, intercept the basic information of the battery and the state of charge of the battery, and upload them to the corresponding cloud of the battery management system;

[0010] Through the mapping relationship between the historical basic information and the historical state of charge of the battery stored in the cloud and the historical lithium plating boundary of the corresponding battery, fit the lithium plating boundary of the battery corresponding to the basic information and the state of charge of the battery, and calculate the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary in the initial state when the battery is not in use;

[0011] Send the lithium deposition boundary coefficient and the instruction for the mode of reducing the cell voltage difference to the battery management system through Over-the-Air (OTA) technology. The instruction for the mode of reducing the cell voltage difference is an instruction to increase the instantaneous charging current of the remaining state of charge of the battery when the state of charge of the battery is greater than a set state-of-charge threshold;

[0012] After receiving the instruction for the mode of reducing the cell voltage difference, the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium deposition boundary coefficient, and combines it with the set fast charging cut-off voltage to perform fast charging regulation of the battery. The target instantaneous charging current does not exceed the lithium deposition boundary of the battery;

[0013] When performing fast charging regulation of the battery, send a signal of abnormal cell voltage difference to the service management platform of the battery through the OTA. After the service management platform performs maintenance on the cell voltage difference until the cell voltage difference is within the safety threshold, send an instruction to exit the mode of reducing the cell voltage difference through the OTA.

[0014] To achieve the above object, an OTA regulation strategy and maintenance device for abnormal cell voltage difference according to a second aspect embodiment of the present invention is provided. The device includes:

[0015] A monitoring module, configured to intercept the basic information and the state of charge of the battery and upload them to the corresponding cloud of the battery management system when the battery management system monitors that the cell voltage difference of the battery is abnormal;

[0016] A fitting module, configured to fit the lithium deposition boundary of the battery corresponding to the basic information and the state of charge of the battery through the mapping relationship between the historical basic information and the historical state of charge of the battery stored in the cloud and the historical lithium deposition boundary of the corresponding battery, and calculate the lithium deposition boundary coefficient of the battery according to the lithium deposition boundary and the initial lithium deposition boundary of the battery in the unused initial state;

[0017] A first sending module, configured to send the lithium deposition boundary coefficient and the instruction for the mode of reducing the cell voltage difference to the battery management system through Over-the-Air (OTA) technology. The instruction for the mode of reducing the cell voltage difference is an instruction to increase the instantaneous charging current of the remaining state of charge of the battery when the state of charge of the battery is greater than a set state-of-charge threshold;

[0018] A calculation module, configured to, after the battery management system receives the instruction for the mode of reducing the cell voltage difference, calculate the target instantaneous charging current of the remaining state of charge of the battery according to the lithium deposition boundary coefficient, and combine it with the set fast charging cut-off voltage to perform fast charging regulation of the battery. The target instantaneous charging current does not exceed the lithium deposition boundary of the battery;

[0019] A second sending module, configured to send a signal of abnormal cell voltage difference to the service management platform of the battery through the OTA when performing fast charging regulation of the battery. After the service management platform performs inspection on the cell voltage difference until the cell voltage difference is within the safety threshold, an instruction to exit the mode of slowing down the cell voltage difference is sent through the OTA.

[0020] To achieve the above object, an embodiment of the third aspect of the present invention provides an electronic device, including: 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 method described in the first aspect.

[0021] To achieve the above object, an embodiment of the fourth aspect of the present invention provides a non-transitory computer-readable storage medium storing computer instructions, and the computer instructions are used to cause the computer to execute the method described in the first aspect.

[0022] The OTA regulation strategy and inspection method, device, electronic device and storage medium for abnormal cell voltage difference provided by the embodiments of the present invention, in the case where the battery management system monitors abnormal cell voltage difference of the battery, fit the lithium plating boundary of the battery according to the basic information of the battery and the state of charge of the battery by the corresponding cloud end of the battery management system, and then calculate the lithium plating boundary coefficient with the initial lithium plating boundary of the battery; send the lithium plating boundary coefficient and the instruction to slow down the voltage difference mode to the battery management system through the over-the-air (OTA) technology; the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and performs fast charging regulation of the battery in combination with the fast charging cut-off voltage; send a signal of abnormal cell voltage difference to the service management platform of the battery through the OTA, and after inspection, the OTA issues an instruction to exit the mode of slowing down the cell voltage difference. Thus, when the cell voltage difference is abnormal, instructions and signals are sent through the OTA to slow down the deterioration of the cell voltage difference problem and complete the maintenance of the cell voltage difference without feeling.

[0023] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0025] Figure 1 It is a schematic flow chart of an OTA regulation strategy and inspection method for abnormal cell voltage difference provided by an embodiment of the present invention;

[0026] Figure 2A flowchart for battery fast charging regulation execution when the cell voltage difference is abnormal provided by an embodiment of the present invention;

[0027] Figure 3 A flowchart for cell voltage difference inspection execution when the cell voltage difference is abnormal provided by an embodiment of the present invention;

[0028] Figure 4 An implementation example diagram for charging a battery with the maximum instantaneous charging current during the battery charging process provided by an embodiment of the present invention;

[0029] Figure 5 An implementation example diagram for charging a battery with a target instantaneous charging current during the battery charging process provided by an embodiment of the present invention;

[0030] Figure 6 Another implementation example diagram for charging a battery with a target instantaneous charging current during the battery charging process provided by an embodiment of the present invention;

[0031] Figure 7 A flowchart for the execution of an OTA regulation strategy and inspection method for abnormal cell voltage differences provided by an embodiment of the present invention;

[0032] Figure 8 A schematic structural diagram of an OTA regulation strategy and inspection device for abnormal cell voltage differences provided by an embodiment of the present invention. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] It should be noted that, in the technical solution of the present invention, the acquisition, storage, use, processing, etc. of data all comply with the relevant regulations of relevant laws and regulations.

[0035] The OTA regulation strategy, inspection method, and device for abnormal cell voltage differences according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0036] Figure 1 A flowchart of an OTA regulation strategy and inspection method for abnormal cell voltage differences provided by an embodiment of the present invention.

[0037] As Figure 1 shown, the method includes the following steps:

[0038] Step 101, when the battery management system detects abnormal cell voltage difference of the battery, intercept the basic information of the battery and the state of charge of the battery, and upload them to the corresponding cloud of the battery management system.

[0039] Optionally, the battery is a lithium-ion battery, and the abnormal cell voltage difference may be a first-level fault of the cell voltage difference. The first-level fault of the cell voltage difference means that the voltage difference between a single cell and other cells in the battery is too large, resulting in the abnormal operation of the battery system.

[0040] In some possible implementation manners, the OTA regulation strategy and maintenance method for abnormal cell voltage difference are applied to a vehicle.

[0041] Further, when the OTA regulation strategy and maintenance method for abnormal cell voltage difference are applied to a vehicle, the battery management system is a vehicle-end battery management system, and the service management platform of the battery is a vehicle maintenance platform.

[0042] Specifically, after the vehicle reports a first-level fault of the cell voltage difference, the Battery Management System (BMS) intercepts the basic information of the battery and the State of Charge (SOC) of the battery, and uploads them to the corresponding cloud of the BMS.

[0043] Step 102, through the mapping relationship between the historical basic information and historical state of charge stored in the cloud and the historical lithium plating boundary of the corresponding battery, fit the lithium plating boundary of the battery corresponding to the basic information and the state of charge, and calculate the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary in the initial state when the battery is not used.

[0044] In some possible implementation manners, calculating the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary in the initial state when the battery is not used includes: taking the ratio of the lithium plating boundary to the initial lithium plating boundary in the initial state when the battery is not used as the lithium plating boundary coefficient (A) of the battery, where the lithium boundary coefficient is between 0 and 1 (0 > A > 1), to achieve accurate prediction of the lithium plating boundary coefficient.

[0045] Step 103, send the lithium plating boundary coefficient and the instruction for the mode of reducing the cell voltage difference to the battery management system through Over-the-Air Technology (OTA), where the instruction for the mode of reducing the cell voltage difference is an instruction to increase the instantaneous charging current of the remaining state of charge of the battery when the state of charge of the battery is greater than the set power threshold.

[0046] In some possible implementation manners, Over-the-Air Technology (OTA) is a technology for remotely managing the battery management system and cloud data through the air interface of mobile communication.

[0047] Step 104: After receiving the instruction of the mode for reducing the cell voltage difference, the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and combines the set fast charging cut-off voltage to perform fast charging regulation of the battery, where the target instantaneous charging current does not exceed the lithium plating boundary of the battery.

[0048] In some possible implementation manners, after receiving the instruction of the mode for reducing the cell voltage difference, the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and combines the set fast charging cut-off voltage to perform fast charging regulation of the battery, including: after receiving the instruction of the mode for reducing the cell voltage difference, the battery management system caches the lithium plating boundary coefficient, retrieves the maximum instantaneous charging current allowed during the charging process of the battery, and takes the product of the maximum instantaneous charging current and the lithium plating boundary coefficient as the target instantaneous charging current of the remaining state of charge of the battery; according to the target instantaneous charging current and the set fast charging cut-off voltage, perform fast charging regulation of the battery, so that both the highest cell voltage and the lowest voltage in the battery rapidly increase to reach the charging cut-off condition (fast charging cut-off voltage), and reduce the dynamic voltage difference of the cells.

[0049] The lithium plating boundary of the battery refers to the conditions under which lithium plating occurs in the lithium-ion battery. Lithium plating means that after lithium ions are deintercalated from the positive electrode during charging, they fail to be embedded in the negative electrode and lithium metal is deposited on the surface of the negative electrode. The lithium plating phenomenon will cause the battery capacity to decay and the cycle life to shorten, affecting the performance and safety of the battery.

[0050] Furthermore, the fast charging cut-off voltage is set according to the state of charge of the battery retrieved within a preset period. The fast charging cut-off voltage includes two cut-off voltage thresholds, where: the first cut-off voltage threshold is applied when the state of charge of the battery retrieved within the preset period is less than or equal to the charge threshold; the second cut-off voltage threshold is applied when the state of charge of the battery retrieved within the preset period is greater than the preset charge threshold, and the second fast charging cut-off voltage is less than the first fast charging cut-off voltage.

[0051] The preset period can be 10 days, and the charge threshold can be 10%, but it is not limited thereto, and this embodiment does not make specific limitations on this.

[0052] For example, the execution process of fast charging regulation of the battery when the cell voltage difference is abnormal is as Figure 2As shown, taking the charging threshold as 10% as an example, if the SOC of the vehicle is lower than (less than or equal to) 10% for 10 days, the first cut-off voltage threshold is 3.7V. If the SOC of the vehicle is greater than 10% for 10 days, the second cut-off voltage threshold is 3.65V. Specifically, when the vehicle-end BMS enters the mode of reducing the cell voltage difference, in the case of receiving the OTA instruction to exit the mode of reducing the cell voltage difference (if not received, the process ends), the lithium plating boundary coefficient is cached, and the maximum instantaneous charging current allowed during the charging process of the battery (the fast charging map for local voltage difference reduction) is retrieved. Multiply the fast charging map for local voltage difference reduction by A as the target instantaneous charging current for the remaining state of charge (SOC) of the battery (taking SOC greater than 90% as an example). The remaining state of charge of the battery is fast charged at the target instantaneous charging current. When the SOC of the vehicle is less than or equal to 10% within 10 days, the fast charging cut-off voltage is increased to 3.7V, which is the first cut-off voltage threshold. When the SOC of the vehicle is greater than 10% within 10 days, the fast charging cut-off voltage remains at 3.65V, which is the second cut-off voltage threshold. Then, it is judged whether the OTA issues an instruction to exit the mode of reducing the cell voltage difference. If not received, the fast charging control of the battery is restarted. If the instruction to exit the mode of reducing the cell voltage difference is received, normal fast charging of the battery is carried out according to the fast charging map for local voltage difference reduction.

[0053] Therefore, if the SOC of the customer's vehicle is lower than 10% recently, it proves that the customer has a high demand for battery power. By setting the fast charging cut-off voltage to 3.7V, the reduction in charging power caused by high-rate charging at the end is compensated.

[0054] Step 105: When performing fast charging control of the battery, send a signal of abnormal cell voltage difference to the battery service management platform through OTA. After the service management platform checks the cell voltage difference until the cell voltage difference is within the safe threshold, send an instruction to exit the mode of reducing the cell voltage difference through OTA.

[0055] In some possible implementation manners, after the fast charging control of the battery is completed, the highest cell voltage and the lowest cell voltage in the battery will drop, and the drop rate of the highest cell voltage is greater than the drop rate of the lowest cell voltage.

[0056] For example, the execution process of checking the cell voltage difference when the cell voltage difference is abnormal is as Figure 3As shown, taking the battery on a vehicle as an example, the service management platform can be the vehicle maintenance platform (the vehicle information management backend of a 4S store). After the OTA sends a signal of abnormal cell voltage difference to the vehicle information management backend of the battery, the vehicle information management backend receives the repair of the cell voltage difference problem and then determines whether the maintenance data for the repair of the cell voltage difference problem has received an increase in the cell voltage difference detection and maintenance requirements (if not received, it is normal vehicle maintenance and the maintenance is completed). When the cell voltage difference detection and maintenance requirements are received, the battery voltage difference detection and maintenance are carried out (replacing the cell or actively balancing the cell voltage difference). After the cell voltage difference is qualified (when it is within the safety threshold), it is reported that the repair of the cell voltage difference problem is completed, and then normal vehicle maintenance is carried out and the maintenance is completed. The overall process completes the non-intrusive maintenance of the cell voltage difference problem.

[0057] In the OTA regulation strategy and maintenance method for abnormal cell voltage difference according to the embodiments of the present invention, when the battery management system detects abnormal cell voltage difference of the battery, the battery management system fits the lithium plating boundary of the battery according to the basic information and state of charge of the battery corresponding to the cloud, and then calculates the lithium plating boundary coefficient with the initial lithium plating boundary of the battery; the lithium plating boundary coefficient and the instruction for the voltage difference reduction mode are sent to the battery management system through the over-the-air (OTA) technology; the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and combines the fast charge cut-off voltage to carry out fast charge regulation of the battery; the OTA sends a signal of abnormal cell voltage difference to the service management platform of the battery, and after maintenance, the OTA issues an instruction to exit the voltage difference reduction mode of the cell. Thus, when the cell voltage difference is abnormal, instructions and signals are sent through the OTA to slow down the deterioration of the cell voltage difference problem and complete the non-intrusive maintenance of the cell voltage difference.

[0058] An embodiment diagram of charging with the maximum instantaneous charging current during the battery charging process provided by the embodiments of the present invention is as Figure 4 shown. Taking charging with a fast charge map (the maximum instantaneous charging current during the battery charging process) as an example, setting the cut-off voltage to 3.65 V and the end charging current to 12.5 A (the instantaneous charging current of the remaining state of charge of the battery, positive for charging and negative for discharging), the highest cell voltage and the lowest cell voltage in the battery are generated, and the calculated end cell voltage difference is 251 mV.

[0059] An embodiment diagram of charging with the target instantaneous charging current during the battery charging process provided by the embodiments of the present invention is as Figure 5As shown in the figure, taking the example of fast charging the state of charge of the battery to a set state-of-charge threshold using a fast charging map and then fast charging the remaining state of charge of the battery with a target instantaneous charging current, while setting the cut-off voltage to 3.65V, the terminal charging current (the instantaneous charging current of the remaining state of charge of the battery, A positive: charging, negative: discharging) is 12.5A. Then, the highest cell voltage and the lowest cell voltage in the battery are generated, and the calculated terminal cell voltage difference is 202mV, which is less than 251mV.

[0060] Another embodiment diagram of charging with a target instantaneous charging current during the battery charging process provided by an embodiment of the present invention is as follows Figure 6 As shown in the figure, taking the example of fast charging the state of charge of the battery to a set state-of-charge threshold using a fast charging map and then fast charging the remaining state of charge of the battery with a target instantaneous charging current, while setting the cut-off voltage to 3.7V, the terminal charging current (the instantaneous charging current of the remaining state of charge of the battery, A positive: charging, negative: discharging) is 30A. Then, the highest cell voltage and the lowest cell voltage in the battery are generated, and the calculated terminal cell voltage difference is 220mV, which is less than 251mV but greater than 202mV. Thus, when the customer's demand for electricity is not high, the cut-off voltage still remains at 3.65V.

[0061] In addition, to clearly illustrate the previous embodiment, this embodiment also provides a flowchart of the execution of an OTA regulation strategy and a maintenance method for abnormal cell voltage difference, as follows Figure 7 As shown in the figure, specifically, for OTA push, after determining whether the vehicle reports a first-level fault of cell voltage difference, the BMS intercepts the basic information of the vehicle's battery and the SOC of the current vehicle, and fits the lithium plating boundary of the current vehicle's battery basic information and SOC based on cloud big data. Taking the lithium plating boundary / the initial lithium plating boundary in the initial state when the battery is not in use as the lithium plating boundary coefficient A, where 1 > A > 0; OTA sends A to the vehicle-end BMS and issues an instruction to enter the pressure difference mitigation mode; OTA pushes the detection and maintenance requirements (repair) of the abnormal battery voltage difference signal to the vehicle information management background of the 4S store; OTA updates the vehicle maintenance detection and maintenance status in real time. If the detection and maintenance are not completed, A is updated in real time and the pressure difference mitigation mode is continued; if the detection and maintenance are completed, OTA sends an instruction to exit the pressure difference mitigation mode.

[0062] To implement the above embodiment, the present invention also proposes an OTA regulation strategy and a maintenance device for abnormal cell voltage difference.

[0063] Figure 8 It is a schematic structural diagram of an OTA regulation strategy and a maintenance device for abnormal cell voltage difference provided by an embodiment of the present invention.

[0064] As follows Figure 8As shown, the OTA regulation strategy and maintenance device 80 for abnormal cell voltage difference of the battery cell includes: a monitoring module 81, a fitting module 82, a first sending module 83, a calculation module 84, and a second sending module 85.

[0065] The monitoring module 81 is configured to intercept the basic information of the battery and the state of charge of the battery and upload them to the corresponding cloud of the battery management system when the battery management system detects abnormal cell voltage difference of the battery.

[0066] The fitting module 82 is configured to fit the lithium plating boundary of the battery corresponding to the basic information and the state of charge of the battery through the mapping relationship between the historical basic information and the historical state of charge of the battery stored in the cloud and the historical lithium plating boundary of the corresponding battery, and calculate the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary of the battery in the unused initial state.

[0067] The first sending module 83 is configured to send the lithium plating boundary coefficient and the instruction for the mode of reducing the cell voltage difference to the battery management system through Over-the-Air (OTA) technology. The instruction for the mode of reducing the cell voltage difference is an instruction to increase the instantaneous charging current of the remaining state of charge of the battery when the state of charge of the battery is greater than the set power threshold.

[0068] The calculation module 84 is configured to, after the battery management system receives the instruction for the mode of reducing the cell voltage difference, calculate the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and perform fast charging regulation of the battery in combination with the set fast charging cut-off voltage, where the target instantaneous charging current does not exceed the lithium plating boundary of the battery.

[0069] The second sending module 85 is configured to send a signal of abnormal cell voltage difference to the service management platform of the battery through the OTA when performing fast charging regulation of the battery. After the service management platform performs maintenance on the cell voltage difference until the cell voltage difference is within the safe threshold, an instruction to exit the mode of reducing the cell voltage difference is sent through the OTA.

[0070] Furthermore, in a possible implementation manner of the embodiment of the present invention, when the OTA regulation strategy and maintenance device for abnormal cell voltage difference is applied to a vehicle, the battery management system is a vehicle-end battery management system, and the service management platform of the battery is a vehicle maintenance platform.

[0071] Furthermore, in a possible implementation manner of the embodiment of the present invention, the fitting module 82 is specifically configured to:

[0072] Take the ratio of the lithium plating boundary to the initial lithium plating boundary of the battery in the unused initial state as the lithium plating boundary coefficient A of the battery, where the lithium boundary coefficient is between 0 and 1.

[0073] Further, in a possible implementation manner of the embodiment of the present invention, the calculation module 84 is specifically configured to:

[0074] After receiving the instruction for the mode of slowing down the cell voltage difference, the battery management system caches the lithium plating boundary coefficient, retrieves the maximum instantaneous charging current allowed during the charging process of the battery, and takes the product of the maximum instantaneous charging current and the lithium plating boundary coefficient as the target instantaneous charging current of the remaining state of charge of the battery;

[0075] Perform fast charging regulation of the battery according to the target instantaneous charging current and the set fast charging cut-off voltage.

[0076] Further, in a possible implementation manner of the embodiment of the present invention, the fast charging cut-off voltage is set according to the state of charge of the battery retrieved within a preset period, and the fast charging cut-off voltage includes two cut-off voltage thresholds, where:

[0077] The first cut-off voltage threshold is applied when the state of charge of the battery retrieved within the preset period is less than or equal to the charge threshold;

[0078] The second cut-off voltage threshold is applied when the state of charge of the battery retrieved within the preset period is greater than the preset charge threshold, and the second fast charging cut-off voltage is less than the first fast charging cut-off voltage.

[0079] Further, in a possible implementation manner of the embodiment of the present invention, after the fast charging regulation of the battery is completed, the highest cell voltage and the lowest cell voltage in the battery will drop, and the dropping rate of the highest cell voltage is greater than the dropping rate of the lowest cell voltage.

[0080] For the OTA regulation strategy and maintenance device for abnormal cell voltage difference in the embodiment of the present invention, when the battery management system detects abnormal cell voltage difference of the battery, the battery management system corresponds to the cloud side to fit the lithium plating boundary of the battery according to the basic information of the battery and the state of charge of the battery, and then calculates the lithium plating boundary coefficient with the initial lithium plating boundary of the battery; sends the lithium plating boundary coefficient and the instruction for the mode of slowing down the voltage difference to the battery management system through the over-the-air (OTA) technology; the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and performs fast charging regulation of the battery in combination with the fast charging cut-off voltage; sends a signal of abnormal cell voltage difference to the service management platform of the battery through OTA, and after maintenance, OTA issues an instruction to exit the mode of slowing down the cell voltage difference. Thus, when the cell voltage difference is abnormal, instructions and signals are sent through OTA to slow down the deterioration of the problem of cell voltage difference and complete the invisible maintenance of the cell voltage difference.

[0081] To implement the above embodiment, the present invention further provides an electronic device, including:

[0082] At least one processor; and

[0083] A memory communicatively connected to the at least one processor; wherein,

[0084] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the foregoing method.

[0085] To implement the above embodiments, the present invention further provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the foregoing method.

[0086] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0088] Any process or method description in a flowchart or described in other ways herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of the present invention includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in an opposite order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the art of the embodiments of the present invention.

[0089] The logic and / or steps represented in the flowchart or otherwise described herein can, for example, be considered as a definable sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatuses, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection parts with one or more wirings (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or, if necessary, other appropriate processing, and then stored in a computer memory.

[0090] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0091] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0092] In addition, each functional unit in various embodiments of the present invention can be integrated into one processing module, can exist separately as individual physical units, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0093] The above-mentioned storage medium can be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An OTA regulation strategy and maintenance method for abnormal cell voltage difference, characterized in that, The method includes: When the battery management system detects abnormal cell voltage difference of the battery, intercept the basic information and state of charge of the battery, and upload them to the corresponding cloud of the battery management system; Based on the mapping relationship between the historical basic information and historical state of charge stored in the cloud and the historical lithium plating boundary of the corresponding battery, fit the lithium plating boundary of the battery corresponding to the basic information and state of charge, and calculate the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary in the initial state when the battery is not used; Send the lithium plating boundary coefficient and the instruction for the mode of reducing the cell voltage difference to the battery management system through Over-the-Air (OTA) technology, where the instruction for the mode of reducing the cell voltage difference is an instruction to increase the instantaneous charging current of the remaining state of charge of the battery after the state of charge of the battery is greater than the set power threshold; After receiving the instruction for the mode of reducing the cell voltage difference, the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and combines it with the set fast charging cut-off voltage to perform fast charging regulation of the battery, where the target instantaneous charging current does not exceed the lithium plating boundary of the battery; When performing fast charging regulation of the battery, send a signal of abnormal cell voltage difference to the service management platform of the battery through the OTA. After the service management platform repairs the cell voltage difference until the cell voltage difference is within the safety threshold, send an instruction to exit the mode of reducing the cell voltage difference through the OTA.

2. The OTA regulation strategy and maintenance method for abnormal cell pressure difference according to claim 1, characterized in that The OTA regulation strategy and repair method for abnormal cell voltage difference are applied to vehicles.

3. The OTA regulation strategy and maintenance method for abnormal cell voltage difference according to claim 1, characterized in that The calculating the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary in the initial state when the battery is not used includes: Taking the ratio of the lithium plating boundary to the initial lithium plating boundary in the initial state when the battery is not used as the lithium plating boundary coefficient A of the battery, where the lithium plating boundary coefficient is between 0 and 1.

4. The OTA regulation strategy and maintenance method for abnormal cell voltage difference according to claim 1, wherein After receiving the instruction for the mode of reducing the cell voltage difference, the battery management system calculates the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and combines it with the set fast charging cut-off voltage to perform fast charging regulation of the battery, including: After receiving the instruction for the mode of reducing the cell voltage difference, the battery management system caches the lithium plating boundary coefficient, retrieves the maximum instantaneous charging current allowed during the charging process of the battery, and takes the product of the maximum instantaneous charging current and the lithium plating boundary coefficient as the target instantaneous charging current of the remaining state of charge of the battery; Perform fast charging regulation of the battery according to the target instantaneous charging current and the set fast charging cut-off voltage.

5. The OTA regulation strategy and maintenance method for abnormal cell voltage difference according to claim 4, characterized in that, The fast charging cut-off voltage is set according to the state of charge retrieved within a preset period, and the fast charging cut-off voltage includes two cut-off voltage thresholds, where: The first cut-off voltage threshold is applied when the state of charge retrieved within a preset period is less than or equal to the charge threshold; The second cut-off voltage threshold is applied when the state of charge retrieved within a preset period is greater than the preset charge threshold, and the second fast charging cut-off voltage is less than the first fast charging cut-off voltage.

6. The OTA regulation strategy and maintenance method for abnormal core voltage difference according to claim 4, characterized in that, After the fast charging control of the battery is completed, the highest cell voltage and the lowest cell voltage in the battery will drop, and the dropping rate of the highest cell voltage is greater than that of the lowest cell voltage.

7. An OTA regulation strategy and maintenance device for abnormal cell voltage difference, characterized in that, The device includes: A monitoring module, configured to intercept the basic information of the battery and the state of charge of the battery and upload them to the corresponding cloud of the battery management system when the battery management system detects abnormal cell voltage difference of the battery; A fitting module, configured to fit the lithium plating boundary of the battery corresponding to the basic information and the state of charge of the battery through the mapping relationship between the historical basic information stored in the cloud, the historical state of charge of the battery and the historical lithium plating boundary of the corresponding battery, and calculate the lithium plating boundary coefficient of the battery according to the lithium plating boundary and the initial lithium plating boundary in the initial state when the battery is not used; A first sending module, configured to send the lithium plating boundary coefficient and the instruction for the mode of reducing the cell voltage difference to the battery management system through Over-the-Air (OTA) technology, where the instruction for the mode of reducing the cell voltage difference is an instruction to increase the instantaneous charging current of the remaining state of charge of the battery when the state of charge of the battery is greater than the set charge threshold; A calculation module, configured to, after the battery management system receives the instruction for the mode of reducing the cell voltage difference, calculate the target instantaneous charging current of the remaining state of charge of the battery according to the lithium plating boundary coefficient, and perform fast charging control of the battery in combination with the set fast charging cut-off voltage, where the target instantaneous charging current does not exceed the lithium plating boundary of the battery; A second sending module, configured to send a signal of abnormal cell voltage difference to the service management platform of the battery through the OTA when performing fast charging control of the battery. After the service management platform performs maintenance on the cell voltage difference until the cell voltage difference is within the safe threshold, an instruction to exit the mode of reducing the cell voltage difference is sent through the OTA.

8. The OTA regulation strategy and maintenance device for abnormal cell voltage difference according to claim 7, characterized in that, When the OTA control strategy and maintenance device for abnormal cell voltage difference are applied to a vehicle, the battery management system is the vehicle-end battery management system, and the service management platform of the battery is the vehicle maintenance platform.

9. The OTA regulation strategy and maintenance device for abnormal cell voltage difference according to claim 7, characterized in that, The fitting module is specifically configured to: Use the ratio of the lithium plating boundary to the initial lithium plating boundary in the initial state when the battery is not used as the lithium plating boundary coefficient A of the battery, where the lithium boundary coefficient is between 0 and 1.

10. The OTA regulation strategy and maintenance device for abnormal cell voltage difference according to claim 7, characterized in that, The calculation module is specifically configured to: After the battery management system receives the instruction for the mode of reducing the cell voltage difference, cache the lithium plating boundary coefficient, retrieve the maximum instantaneous charging current allowed during the charging process of the battery, and use the product of the maximum instantaneous charging current and the lithium plating boundary coefficient as the target instantaneous charging current of the remaining state of charge of the battery; Perform fast charging control of the battery according to the target instantaneous charging current and the set fast charging cut-off voltage.

11. The OTA regulation strategy and maintenance device for abnormal cell pressure difference according to claim 10, characterized in that, The fast charging cut-off voltage is set according to the state of charge of the battery retrieved within a preset period, and the fast charging cut-off voltage includes two cut-off voltage thresholds, where: The first cut-off voltage threshold is applied when the state of charge of the battery retrieved within a preset period is less than or equal to the charge threshold; The second cut-off voltage threshold is applied when the state of charge of the battery retrieved within a preset period is greater than the preset charge threshold, and the second fast charging cut-off voltage is less than the first fast charging cut-off voltage.

12. The OTA regulation strategy and maintenance device for abnormal cell voltage difference according to claim 10, characterized in that, After completing the fast charging regulation of the battery, the highest cell voltage and the lowest cell voltage in the battery will decline, and the decline rate of the highest cell voltage is greater than that of the lowest cell voltage.

13. An electronic device, characterized in that, Comprising: At least one processor; And A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method according to any one of claims 1-6.

14. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the method according to any one of claims 1-6.

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