Battery pack status warning method, device, equipment, vehicle and medium

Abstract

The present disclosure relates to a battery pack status early warning method, device, equipment, vehicle and medium, including: obtaining overall status information of a battery pack in a specific voltage range when a vehicle is in a working state; determining the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the overall status information; determining a preset single cell charging capacity of the single cell based on the number of cycles and the overall status information; determining the state of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity, so as to provide early warning of the battery pack status, identify vehicles with abnormal battery packs in advance, and reduce the risk of thermal runaway of the battery pack due to abnormal single cells.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle safety technology, and in particular to a battery pack status early warning method, device, equipment, vehicle and medium. Background Art

[0002] With the rapid development of the electric vehicle industry, the number of electric vehicles is increasing. As an important part of electric vehicles, the safety of the battery is particularly important.

[0003] During the use of the battery system, as the service life of the electric vehicle increases, the single battery itself will have abnormal performance. Although the battery system will be quality inspected before leaving the factory, if the performance of the single battery is abnormal during subsequent use, if it is not discovered in time, it will cause the battery to be dangerous during use, increasing the risk of electric vehicles during use. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a battery pack status early warning method, device, equipment, vehicle and medium.

[0005] In a first aspect, an embodiment of the present disclosure provides a battery pack status early warning method, comprising:

[0006] Acquire overall status information of a battery pack in a specific voltage range when the vehicle is in a working state, wherein the battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each single cell, and cumulative charging capacity;

[0007] Determine the cycle number of the battery pack and the single cell charging capacity of each of the single cells based on the overall status information;

[0008] Determining a preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall status information;

[0009] The state of the battery pack is determined based on a relationship between the single cell charging capacity and the preset single cell charging capacity.

[0010] Optionally, determining the number of cycles of the battery pack and the single-cell charging capacity of each single-cell battery based on the overall status information includes:

[0011] determining a number of cycles of the battery pack based on the accumulated charge capacity and a fixed discharge capacity of the battery pack;

[0012] The single-cell charging capacity of each of the single-cells is determined based on the charging time of each of the single-cells and the charging current.

[0013] Optionally, determining the number of cycles of the battery pack based on the accumulated charging capacity and the fixed discharge capacity of the battery pack includes:

[0014] Determining, based on the accumulated charging capacity, an increased charging capacity of the battery pack in a specific voltage range when the vehicle is in the current working state;

[0015] The number of cycles of the battery pack is determined by calculating a quotient of the increased charging capacity and the fixed discharging capacity.

[0016] Optionally, determining the preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall state information includes:

[0017] The preset single-cell charging capacity of the single-cell battery is determined from a correlation table based on the number of cycles, the charging current, and the charging temperature.

[0018] Optionally, determining the preset single-cell charging capacity of the single-cell battery from an association relationship table based on the number of cycles, the charging current, and the charging temperature includes:

[0019] Based on the number of cycles, determining a first preset single-cell charging capacity of the single-cell battery from a first association table, wherein the first association table includes the first preset single-cell charging capacity of the single-cell battery at the same charging temperature, the same charging current, and different number of cycles;

[0020] Based on the charging current, determining a second preset single-cell charging capacity of the single-cell battery from a second association table, wherein the second association table includes the second preset single-cell charging capacity of the single-cell battery under the same number of cycles, the same charging temperature, and different charging currents;

[0021] Based on the charging temperature, determining a third preset single-cell charging capacity of the single-cell battery from a third association table, wherein the third association table includes third preset single-cell charging capacities of the single-cell battery at the same number of cycles, the same charging current, and different charging temperatures;

[0022] The preset single-cell charging capacity of the single-cell battery is determined based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity.

[0023] Optionally, determining the preset single-cell charging capacity of the single-cell battery based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity includes:

[0024] Respectively obtaining a first weight coefficient, a second weight coefficient, and a third weight coefficient corresponding to the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity;

[0025] The preset single cell charging capacity of the single cell battery is determined by weighted summing the first preset single cell charging capacity, the second preset single cell charging capacity, the third preset single cell charging capacity, the first weight coefficient, the second weight coefficient and the third weight coefficient.

[0026] Optionally, determining the state of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity includes:

[0027] When the single-cell charging capacity of any single-cell battery is greater than or equal to the preset single-cell charging capacity, the battery pack is in a normal state;

[0028] When there is a single cell charging capacity of the single cell that is less than the preset single cell charging capacity, the battery pack is in a warning state;

[0029] When the single-cell charging capacity of any single-cell battery is less than the preset single-cell charging capacity, the battery pack is in an abnormal state.

[0030] In a second aspect, an embodiment of the present disclosure provides a battery pack status warning device, including:

[0031] A status information acquisition module, used to acquire overall status information of a battery pack in a specific voltage range when the vehicle is in a working state, wherein the battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each single cell, and cumulative charging capacity;

[0032] A battery pack information determination module, configured to determine the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the overall status information;

[0033] A preset single-cell charging capacity determination module, used to determine the preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall state information;

[0034] The battery pack state determination module is used to determine the state of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity.

[0035] In a third aspect, an embodiment of the present disclosure provides an electronic device, including:

[0036] one or more processors;

[0037] a storage device for storing one or more programs,

[0038] When the one or more programs are executed by the one or more processors, the one or more processors implement any method as described in the first aspect.

[0039] In a fourth aspect, an embodiment of the present disclosure provides a vehicle, comprising the electronic device described in the third aspect.

[0040] In a fifth aspect, an embodiment of the present disclosure provides a computer storage medium having a computer program stored thereon, which, when executed by a processor, implements any method described in the first aspect.

[0041] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0042] The battery pack status warning method, device, equipment, vehicle and medium provided by the embodiments of the present disclosure obtain overall status information of the battery pack in a specific voltage range when the vehicle is in a working state, determine the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the obtained overall status information, determine the preset single cell charging capacity of the single cell based on the determined number of cycles of the battery pack and the overall status information, and finally determine the state of the battery pack through the relationship between the single cell charging capacity and the preset single cell charging capacity, wherein the single cell charging capacity of each single cell determined based on the obtained overall status information is the single cell charging capacity of each single cell during use of the vehicle, and the preset single cell charging capacity of the single cell determined based on the number of cycles of the battery pack and the overall status information is the preset single cell charging capacity of the battery pack, and the state of the battery pack is determined through the relationship between the single cell charging capacity and the preset single cell charging capacity, so as to identify vehicles with abnormal battery packs and reduce the risk of thermal runaway of the battery pack due to abnormal single cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0044] In order to more clearly illustrate the embodiments of the present invention 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.

[0045] Figure 1 is a flowchart of a battery pack status early warning method provided by an embodiment of the present disclosure;

[0046] Figure 2is a flow chart of another battery pack status early warning method provided by an embodiment of the present disclosure;

[0047] Figure 3 is a flow chart of another battery pack status warning method provided by an embodiment of the present disclosure;

[0048] Figure 4 is a structural schematic diagram of a battery pack status warning device provided by an embodiment of the present disclosure;

[0049] Figure 5 It is a structural schematic diagram of an electronic device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0050] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0051] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0052] The present invention provides a battery pack status early warning method, comprising: obtaining overall status information of the battery pack when a vehicle is in a working state, wherein the battery pack comprises a plurality of single cells, and the overall status information comprises: charging current, charging temperature, charging time for each single cell to be charged to a rated voltage, and accumulated charging capacity; determining the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the overall status information; determining a preset single cell charging capacity of the single cell based on the number of cycles and the overall status information; determining the status information of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity, that is, according to the relationship between the single cell charging capacity of each single cell during use of the vehicle and the preset single cell charging capacity obtained by an experiment, issuing an early warning on the battery pack status, identifying vehicles with abnormal battery packs in advance, and reducing the risk of thermal runaway of the battery pack caused by abnormal single cells.

[0053] The battery pack status warning method disclosed in the present invention can be executed by an electronic device or an application, webpage, public account, etc. in the electronic device. The electronic device can be a vehicle-mounted device or a cloud device, and the present invention does not impose any restrictions on the specific type of the electronic device.

[0054] Based on the foregoing description, the present disclosure will take an electronic device as an example in an embodiment and combine it with an application scenario to elaborate on the battery pack status warning method provided by the present disclosure.

[0055] like Figure 1 As shown, the battery pack status early warning method includes:

[0056] S10. Obtaining overall status information of the battery pack in a specific voltage range when the vehicle is in a working state.

[0057] The battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each single cell, and cumulative charging capacity.

[0058] The specific voltage range may be 3V to 4V, for example.

[0059] The vehicle is in working state means that the battery pack of the vehicle is in working state, for example, the battery pack is being charged by a charging pile or an on-board charging device or the battery pack is being discharged during the operation of the vehicle.

[0060] When the vehicle is in operation, the overall status information of the battery pack includes the charging current in a specific voltage range during the charging process of the battery pack, the charging temperature in a specific voltage range, the charging time of each single cell in a specific voltage range, and the cumulative charging capacity in a specific voltage range.

[0061] S20: Determine the cycle number of the battery pack and the single-cell charging capacity of each single-cell battery based on the overall status information.

[0062] After the cumulative charging capacity of the battery pack in a specific voltage interval is obtained, the number of cycles of the battery pack may be determined based on the obtained cumulative charging capacity and then based on the known fixed discharge capacity of the battery pack.

[0063] In addition, after the overall state information of the battery pack is acquired, the single-cell charging capacity of each single-cell battery may be determined based on the charging current in the overall state information and the charging time of each single-cell battery.

[0064] The single-cell charging capacity of each single cell in the battery pack determined based on the overall state information is the single-cell charging capacity of each single cell during use of the vehicle.

[0065] S30, determining a preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall state information.

[0066] After the cycle number of the battery pack is determined, the preset single-cell charging capacity of the single-cell battery is determined based on the cycle number of the battery pack and the acquired overall state information of the battery pack.

[0067] Specifically, the preset single-cell charging capacity of the single-cell battery is based on the test results. By selecting qualified single-cell batteries as test samples, the test samples are subjected to cycle tests of whole-vehicle operating conditions at different charging temperatures, the same charging current and the same number of cycles, and the charging capacity of the single-cell battery in a specific voltage range during the charging process is recorded. The test samples are subjected to cycle tests of whole-vehicle operating conditions at different charging currents, the same charging temperature and the same number of cycles, and the charging capacity of the single-cell battery in a specific voltage range during the charging process is recorded. The test samples are subjected to cycle tests of whole-vehicle operating conditions at different number of cycles, the same charging current and the same charging temperature, and the charging capacity of the single-cell battery in a specific voltage range during the charging process is recorded.

[0068] Based on the above test on the test sample, a charging capacity association table of the single cell under different test conditions is obtained. After the cycle number and overall status information of the battery pack are determined, the preset single cell charging capacity of the single cell can be determined from the determined charging capacity association table.

[0069] S40: Determine the state information of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity.

[0070] After the single cell charging capacity and the preset single cell charging capacity are determined, the state information of the battery pack is determined by comparing the relationship between the single cell charging capacity corresponding to each of the single cells and the preset single cell charging capacity.

[0071] Specifically, determining the state information of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity includes:

[0072] When the single-cell charging capacity of any single-cell battery is greater than or equal to the preset single-cell charging capacity, the battery pack is in a normal state;

[0073] When the single-cell charging capacity of a single-cell battery is less than the preset single-cell charging capacity, the battery pack is in a warning state;

[0074] When the single-cell charging capacity of any single-cell battery is less than the preset single-cell charging capacity, the battery pack is in an abnormal state.

[0075] By comparing the relationship between the single-cell charging capacity and the preset single-cell charging capacity, the status information of the battery pack is determined. When the single-cell charging capacity of any single-cell battery in the battery pack is greater than or equal to the preset single-cell charging capacity, that is, when the vehicle is in a working state, the single-cell charging capacity of any single-cell battery in the battery pack meets the preset single-cell charging capacity, it indicates that the battery pack is in a normal state. When the single-cell charging capacity of a single-cell battery in the battery pack is less than the preset single-cell charging capacity, that is, when the vehicle is in a working state, the single-cell charging capacity of a single-cell battery in the battery pack is less than the preset single-cell charging capacity, the battery pack is in a warning state, ensuring that relevant personnel can promptly discover certain problems with the vehicle and issue a warning in advance. When the single-cell charging capacity of any single-cell battery in the battery pack is less than the preset single-cell charging capacity, that is, when the vehicle is in a working state, the single-cell charging capacity of any single-cell battery in the battery pack does not meet the preset single-cell charging capacity, it indicates that the battery pack is in an abnormal state, and an abnormal state reminder is issued.

[0076] The battery pack status warning method provided by the embodiment of the present disclosure obtains the overall status information of the battery pack in a specific voltage range when the vehicle is in a working state, determines the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the obtained overall status information, determines the preset single cell charging capacity of the single cell based on the determined number of cycles of the battery pack and the overall status information, and finally determines the state of the battery pack through the relationship between the single cell charging capacity and the preset single cell charging capacity, wherein the single cell charging capacity of each single cell determined based on the obtained overall status information is the single cell charging capacity of each single cell during the use of the vehicle, and the preset single cell charging capacity of the single cell determined based on the number of cycles of the battery pack and the overall status information is the preset single cell charging capacity of the battery pack, and the state of the battery pack is determined through the relationship between the single cell charging capacity and the preset single cell charging capacity, and the vehicle with abnormal battery pack is identified, thereby reducing the risk of thermal runaway of the battery pack due to abnormal single cell.

[0077] Figure 2 is a flow chart of another battery pack status warning method provided by an embodiment of the present disclosure. The embodiment of the present disclosure is based on the above embodiment. Figure 2 As shown, a specific implementation method of step S20 includes:

[0078] S21 , determining the cycle number of the battery pack based on the accumulated charging capacity and the fixed discharge capacity of the battery pack.

[0079] After obtaining the overall status information of the battery pack when the vehicle is in working state, based on the cumulative charging capacity in the overall status information and the fixed discharge capacity of the vehicle each time is known, the number of cycles of the battery pack can be determined based on the cumulative charging capacity and the fixed discharge capacity of the battery pack.

[0080] Optionally, determining the number of cycles of the battery pack based on the accumulated charge capacity and the fixed discharge capacity of the battery pack includes:

[0081] Determining an increased charging capacity of the battery pack in a specific voltage interval based on the accumulated charging capacity;

[0082] The number of cycles of the battery pack is determined by taking the quotient of the increasing charge capacity and the fixed discharge capacity.

[0083] Since the vehicle records the cumulative charging capacity of the battery pack in a specific voltage interval in each working state, and uploads the recorded cumulative charging capacity of the battery pack in a specific voltage interval in each working state to the electronic device or cloud device, after receiving the cumulative charging capacity of the battery pack in the specific voltage interval in each working state sent by the vehicle, the electronic device or cloud device determines the increased charging capacity of the battery pack in the specific voltage interval in the current working state based on the cumulative charging capacity of the battery pack in the specific voltage interval in the current working state and the cumulative charging capacity of the battery pack in the specific voltage interval in the previous working state corresponding to the current working state. Exemplarily, the cumulative charging capacity of the battery pack in the specific voltage interval recorded by the vehicle in the current working state is Q1, and the cumulative charging capacity of the battery pack in the specific voltage interval in the previous working state corresponding to the current working state is Q2. Then, the increased charging capacity of the battery pack in the specific voltage interval of the vehicle in the current working state is Q1-Q2. After obtaining the increased charging capacity of the battery pack in the specific voltage interval of the vehicle in the current working state, the number of cycles of the battery pack is determined by taking the quotient of the increased charging capacity and the fixed discharge capacity.

[0084] S22: Determine the single-cell charging capacity of each single-cell battery based on the charging time and charging current of each single-cell battery.

[0085] After the overall state information of the battery pack is acquired when the vehicle is in the working state, the single cell charging capacity of each single cell is determined based on the charging current of the battery pack and the charging time of each single cell in the overall state information.

[0086] It should be noted that in the process of obtaining the single-cell charging capacity of each single cell, it is determined based on the charging current of the battery pack and the charging time for each single cell to be charged to the rated voltage, and the connection mode of each single cell in the battery pack includes a series mode and a parallel mode. When each single cell in the battery pack is in a series mode, the charging current of each single cell in the battery pack is the same as the charging current of the battery pack. At this time, the single-cell charging capacity of each single cell Q single = It, that is, the single-cell charging capacity of each single cell is related to the charging time for each single cell to be charged to the rated voltage. When each single cell in the battery pack is in a parallel mode, the charging current of each single cell in the battery pack is related to each single cell, and the charging current of each single cell is determined based on the resistance of each single cell. At this time, the single-cell charging capacity of each single cell is related to the charging time for each single cell to be charged to the rated voltage, and is also related to the charging current of each single cell. The embodiments of the present disclosure do not provide examples one by one for this.

[0087] Figure 3 is a flow chart of another battery pack status warning method provided by an embodiment of the present disclosure. The embodiment of the present disclosure is based on the above embodiment. Figure 3 As shown, a specific implementation of step S30 includes:

[0088] S31 , determining a preset single-cell charging capacity of a single-cell battery from a correlation table based on the number of cycles, the charging current, and the charging temperature.

[0089] Specifically, the association table is based on test results, and qualified single cells are selected first. By performing a cycle test of the qualified single cells under the whole vehicle working condition, a first association table of qualified single cells at the same charging temperature, the same charging current, and different cycle numbers is obtained, a second association table of qualified single cells at the same cycle number, the same charging temperature, and different charging currents, and a third association table of qualified single cells at the same cycle number, the same charging current, and different charging temperatures are obtained. Then, a first preset single cell charging capacitor of the single cell at the corresponding cycle number is obtained from the first association table, a second preset single cell charging capacitor of the single cell at the corresponding charging current is obtained from the second association table, and a third preset single cell charging capacitor of the single cell at the corresponding charging temperature is obtained from the third association table. Finally, a preset single cell charging capacitor is determined based on the first preset single cell charging capacitor, the second preset single cell charging capacitor, and the third preset single cell charging capacitor.

[0090] Optionally, determining a preset single-cell charging capacitance of a single-cell battery from a correlation table based on the number of cycles, the charging current, and the charging temperature includes:

[0091] Based on the number of cycles, a first preset single cell charging capacity of the single cell battery is determined from a first association table, wherein the first association table includes the first preset single cell charging capacity of the single cell battery at the same charging temperature, the same charging current, and different number of cycles.

[0092] Exemplarily, the first association relationship table is shown in Table 1 below:

[0093] Table 1 The first association relationship table

[0094]

[0095]

[0096] In step S20, after the cycle number of the battery pack is determined based on the overall state information, the first preset charging capacity of the single battery corresponding to the cycle number of the battery pack determined in step S20 is searched from the first association table.

[0097] It should be noted that in a specific implementation, the first association table does not include the cycle number of the battery pack determined in step S20. In this case, the first preset single cell charging capacity corresponding to the cycle number of the battery pack determined in step S20 can be selected from the first association table.

[0098] Based on the charging current, a second preset single cell charging capacity of the single cell battery is determined from a second association table, wherein the second association table includes second preset single cell charging capacities of the single cell battery under the same number of cycles, the same charging temperature, and different charging currents.

[0099] Exemplarily, the second association relationship table is shown in Table 2 below:

[0100] Table 2 Second association relationship table

[0101]

[0102] In step S10, a second preset charging capacity of a single battery corresponding to the charging current of the battery pack obtained in step S10 is searched from the second association table.

[0103] It should be noted that in a specific implementation, the charging current of the battery pack corresponding to step S10 is not included in the second association table. At this time, a second preset single-cell charging capacity corresponding to the charging current of the battery pack corresponding to step S10 can be selected from the second association table.

[0104] Based on the charging temperature, a third preset single cell charging capacity of the single cell battery is determined from a third association table, wherein the third association table includes third preset single cell charging capacities of the single cell battery under the same number of cycles, the same charging current and different charging temperatures.

[0105] Table 3 The third relationship table

[0106]

[0107] In step S10, a third preset charging capacity of a single battery corresponding to the charging temperature of the battery pack obtained in step S10 is searched from the second association table.

[0108] It should be noted that, in a specific implementation, the charging temperature of the battery pack corresponding to step S10 is not included in the third association table. In this case, a third preset single-cell charging capacity corresponding to the charging temperature of the battery pack corresponding to step S10 can be selected from the third association table.

[0109] The preset single-cell charging capacity of the single-cell battery is determined based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity.

[0110] As a specific implementable method, determining a preset single cell charging capacity of a single cell battery based on a first preset single cell charging capacity, a second preset single cell charging capacity, and a third preset single cell charging capacity includes:

[0111] Respectively obtain a first weight coefficient, a second weight coefficient, and a third weight coefficient corresponding to a first preset single-cell charging capacity, a second preset single-cell charging capacity, and a third preset single-cell charging capacity;

[0112] The preset single cell charging capacity of the single cell battery is determined by weighted summing up the first preset single cell charging capacity, the second preset single cell charging capacity, the third preset single cell charging capacity, the first weight coefficient, the second weight coefficient and the third weight coefficient.

[0113] After obtaining the first preset single cell charging capacity, the second preset single cell charging capacity and the third preset single cell charging capacity, a weighted sum is performed based on the first preset single cell charging capacity, the second preset single cell charging capacity, the third preset single cell charging capacity, the first weight coefficient, the second weight coefficient and the third weight coefficient to determine the preset single cell charging capacity of the single cell battery.

[0114] Figure 4 is a structural diagram of a battery pack status warning device provided by an embodiment of the present disclosure, such as Figure 4 As shown, the battery pack status warning device includes:

[0115] The status information acquisition module 410 is used to acquire the overall status information of the battery pack in a specific voltage range when the vehicle is in a working state, wherein the battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each single cell, and cumulative charging capacity;

[0116] A battery pack information determination module 420, configured to determine the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the overall state information;

[0117] A preset single cell charging capacity determination module 430, for determining a preset single cell charging capacity of a single cell battery based on the number of cycles and overall state information;

[0118] The battery pack state determination module 440 is used to determine the state of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity.

[0119] The battery pack status warning device provided by the embodiment of the present disclosure has a status information acquisition module that acquires the overall status information of the battery pack in a specific voltage range when the vehicle is in a working state; the battery pack information determination module determines the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the acquired overall status information; the preset single cell charging capacity determination module determines the preset single cell charging capacity of the single cell based on the determined number of cycles of the battery pack and the overall status information; the battery pack status determination module determines the battery pack status through the relationship between the single cell charging capacity and the preset single cell charging capacity, wherein the single cell charging capacity of each single cell determined based on the acquired overall status information is the single cell charging capacity of each single cell during the use of the vehicle; the preset single cell charging capacity of the single cell determined based on the number of cycles of the battery pack and the overall status information is the preset single cell charging capacity of the battery pack; the battery pack status is determined through the relationship between the single cell charging capacity and the preset single cell charging capacity, the vehicle with abnormal battery pack is identified, and the risk of thermal runaway of the battery pack caused by abnormal single cell is reduced.

[0120] Optionally, the battery pack information determination module includes:

[0121] a cycle number determination unit, configured to determine the cycle number of the battery pack based on the accumulated charge capacity and the fixed discharge capacity of the battery pack;

[0122] The single cell charging capacity determination unit is used to determine the single cell charging capacity of each single cell based on the charging time and charging current of each single cell.

[0123] Optionally, a specific implementation method of the cycle number determination unit includes:

[0124] Determine the additional charging capacity of the battery pack in a specific voltage range when the vehicle is in this working state based on the accumulated charging capacity;

[0125] The number of cycles of the battery pack is determined by taking the quotient of the increasing charge capacity and the fixed discharge capacity.

[0126] Optionally, a specific implementation method of the preset single cell charging capacity determination module includes:

[0127] The preset single-cell charging capacity of the single-cell battery is determined from the association relationship table based on the number of cycles, the charging current and the charging temperature.

[0128] Optionally, another specific implementation method of the preset single cell charging capacity determination module includes:

[0129] Based on the number of cycles, determining a first preset single-cell charging capacity of the single-cell battery from a first association table, wherein the first association table includes first preset single-cell charging capacities of the single-cell battery at the same charging temperature, the same charging current, and different number of cycles;

[0130] Based on the charging current, determining a second preset single-cell charging capacity of the single-cell battery from a second association table, wherein the second association table includes second preset single-cell charging capacities of the single-cell battery under the same number of cycles, the same charging temperature, and different charging currents;

[0131] Based on the charging temperature, determining a third preset single-cell charging capacity of the single-cell battery from a third association table, wherein the third association table includes third preset single-cell charging capacities of the single-cell battery at the same number of cycles, the same charging current, and different charging temperatures;

[0132] The preset single-cell charging capacity of the single-cell battery is determined based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity.

[0133] Optionally, determining a preset single-cell charging capacity of a single-cell battery based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity includes:

[0134] Respectively obtain a first weight coefficient, a second weight coefficient, and a third weight coefficient corresponding to a first preset single-cell charging capacity, a second preset single-cell charging capacity, and a third preset single-cell charging capacity;

[0135] The preset single cell charging capacity of the single cell battery is determined by weighted summing up the first preset single cell charging capacity, the second preset single cell charging capacity, the third preset single cell charging capacity, the first weight coefficient, the second weight coefficient and the third weight coefficient.

[0136] Optionally, a specific implementation of the battery pack status determination module includes:

[0137] When the single-cell charging capacity of any single-cell battery is greater than or equal to the preset single-cell charging capacity, the battery pack is in a normal state;

[0138] When the single-cell charging capacity of a single-cell battery is less than the preset single-cell charging capacity, the battery pack is in a warning state;

[0139] When the single-cell charging capacity of any single-cell battery is less than the preset single-cell charging capacity, the battery pack is in an abnormal state.

[0140] The device provided by the embodiment of the present invention can execute the method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0141] It is worth noting that in the embodiment of the above-mentioned device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0142] Figure 5 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present disclosure, such as Figure 5 As shown, the electronic device includes a processor 510, a memory 520, an input device 530 and an output device 540; the number of processors 510 in the computer device can be one or more. Figure 5 A processor 510 is taken as an example; the processor 510, the memory 520, the input device 530 and the output device 540 in the electronic device can be connected via a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0143] The memory 520 is a computer-readable storage medium that can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the method in the embodiment of the present invention. The processor 510 executes various functional applications and data processing of the computer device by running the software programs, instructions and modules stored in the memory 520, that is, implements the method provided in the embodiment of the present invention.

[0144] The memory 520 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 520 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 520 may further include a memory remotely arranged relative to the processor 510, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0145] The input device 530 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the electronic device, and may include a keyboard, a mouse, etc. The output device 540 may include a display device such as a display screen.

[0146] The present disclosure also provides a storage medium containing computer executable instructions, which are used to implement the method provided by the embodiment of the present disclosure when executed by a computer processor:

[0147] Obtaining overall status information of a battery pack in a specific voltage range when the vehicle is in a working state, wherein the battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each single cell, and cumulative charging capacity;

[0148] Determine the number of cycles of the battery pack and the single-cell charging capacity of each single-cell battery based on the overall status information;

[0149] Determine a preset single cell charging capacity of the single cell battery based on the number of cycles and the overall status information;

[0150] The state of the battery pack is determined based on a relationship between the single cell charging capacity and a preset single cell charging capacity.

[0151] Of course, the computer executable instructions of a storage medium including computer executable instructions provided by an embodiment of the present invention are not limited to the operations of the method described above, but can also execute related operations in the method provided by any embodiment of the present invention.

[0152] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (FLASH), a hard disk or an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0153] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0154] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack status early warning method, characterized in that: include: Acquire overall status information of a battery pack in a specific voltage range when the vehicle is in a working state, wherein the battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each of the single cells, and cumulative charging capacity, and the specific voltage range is a preset voltage range when the plurality of single cells are in a working state; Determine the cycle number of the battery pack and the single cell charging capacity of each of the single cells based on the overall status information; Determining a preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall status information; The state of the battery pack is determined based on a relationship between the single cell charging capacity and the preset single cell charging capacity.

2. The method according to claim 1, characterized in that The determining the number of cycles of the battery pack and the single-cell charging capacity of each single-cell battery based on the overall status information comprises: determining a number of cycles of the battery pack based on the accumulated charge capacity and a fixed discharge capacity of the battery pack; The single-cell charging capacity of each of the single-cells is determined based on the charging time of each of the single-cells and the charging current.

3. The method according to claim 2, characterized in that The determining the number of cycles of the battery pack based on the accumulated charging capacity and the fixed discharge capacity of the battery pack comprises: Determining, based on the accumulated charging capacity, an increased charging capacity of the battery pack in a specific voltage range when the vehicle is in the current working state; The number of cycles of the battery pack is determined by calculating a quotient of the increased charging capacity and the fixed discharging capacity.

4. The method according to claim 1, characterized in that: The determining the preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall state information includes: The preset single-cell charging capacity of the single-cell battery is determined from a correlation table based on the number of cycles, the charging current, and the charging temperature.

5. The method according to claim 4, characterized in that The determining the preset single-cell charging capacity of the single-cell battery from the association relationship table based on the number of cycles, the charging current, and the charging temperature includes: Based on the number of cycles, determining a first preset single-cell charging capacity of the single-cell battery from a first association table, wherein the first association table includes the first preset single-cell charging capacity of the single-cell battery at the same charging temperature, the same charging current, and different number of cycles; Based on the charging current, determining a second preset single-cell charging capacity of the single-cell battery from a second association table, wherein the second association table includes the second preset single-cell charging capacity of the single-cell battery under the same number of cycles, the same charging temperature, and different charging currents; Based on the charging temperature, determining a third preset single-cell charging capacity of the single-cell battery from a third association table, wherein the third association table includes third preset single-cell charging capacities of the single-cell battery at the same number of cycles, the same charging current, and different charging temperatures; Determining a preset single-cell charging capacity of the single-cell battery based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity; The determining the preset single-cell charging capacity of the single-cell battery based on the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity includes: Respectively obtaining a first weight coefficient, a second weight coefficient, and a third weight coefficient corresponding to the first preset single-cell charging capacity, the second preset single-cell charging capacity, and the third preset single-cell charging capacity; The preset single cell charging capacity of the single cell battery is determined by weighted summing the first preset single cell charging capacity, the second preset single cell charging capacity, the third preset single cell charging capacity, the first weight coefficient, the second weight coefficient and the third weight coefficient.

6. The method according to claim 1, characterized in that The determining the state of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity includes: When the single-cell charging capacity of any single-cell battery is greater than or equal to the preset single-cell charging capacity, the battery pack is in a normal state; When there is a single cell charging capacity of the single cell that is less than the preset single cell charging capacity, the battery pack is in a warning state; When the single cell charging capacity of any single cell is less than the preset single cell charging capacity, the battery pack is in an abnormal state.

7. A battery pack status warning device, characterized in that: include: A status information acquisition module, used to acquire overall status information of a battery pack in a specific voltage range when the vehicle is in a working state, wherein the battery pack includes a plurality of single cells, and the overall status information includes: charging current, charging temperature, charging time of each of the single cells, and cumulative charging capacity, and the specific voltage range is a preset voltage range when the plurality of single cells are in a working state; A battery pack information determination module, configured to determine the number of cycles of the battery pack and the single cell charging capacity of each single cell based on the overall status information; A preset single-cell charging capacity determination module, used to determine a preset single-cell charging capacity of the single-cell battery based on the number of cycles and the overall state information; The battery pack state determination module is used to determine the state of the battery pack based on the relationship between the single cell charging capacity and the preset single cell charging capacity.

8. An electronic device, characterized in that: include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 6.

9. A vehicle, characterized in that: The electronic device comprising the electronic device described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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