Battery device thermal anomaly detection method, detection device and energy storage device

Abstract

The embodiments of the present application provide a method, a detection device, and an energy storage device for detecting thermal anomalies of a battery device. The battery device includes one or more battery cells. The detection method includes: obtaining status parameter information of battery cells in multiple battery devices; determining the thermal anomaly level of the battery device based on the status parameter information. The thermal anomaly level includes a first-level thermal anomaly and a second-level thermal anomaly. The first-level thermal anomaly is used to indicate a thermal anomaly of a first battery device. The thermal anomaly of the first battery device includes a thermal anomaly of a first sub-battery device and the thermal anomaly of the first sub-battery device spreads to a second sub-battery device. The second-level thermal anomaly is used to indicate that the thermal anomaly of the first battery device spreads to a second battery device. The method, the detection device, and the energy storage device for detecting thermal anomalies of a battery device provided by the embodiments of the present application can timely and accurately detect thermal anomalies of a battery device.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a method for detecting thermal anomalies of a battery device, a detection device, and an energy storage device. Background Art

[0002] Due to its advantages such as high energy density, rechargeable, safety and environmental protection, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] Under the influence of overcharge, overdischarge, overheating, mechanical collision and other factors, the battery may experience thermal anomalies, such as the temperature inside the battery may continue to rise, leading to thermal runaway. When one or more battery cells experience thermal runaway, the heat will be transferred to adjacent battery cells or other adjacent devices, affecting the performance and service life of adjacent battery cells or other devices, and may even cause fire or explosion at any time.

[0004] Therefore, timely and accurate detection of battery thermal anomalies is necessary so that timely responses and operations can be made when the battery thermal anomalies occur, thereby improving the performance and service life of the battery and reducing the impact of battery thermal anomalies, such as the possibility of causing fire or explosion. Summary of the invention

[0005] The embodiments of the present application provide a method for detecting thermal anomalies of a battery device, a detection device, and an energy storage device, which can detect thermal anomalies of a battery device in a timely and accurate manner.

[0006] In a first aspect, a method for detecting thermal anomalies of a battery device is provided, the detection method comprising: acquiring status parameter information of battery cells in a plurality of battery devices; determining a thermal anomaly level of the battery device based on the status parameter information, the thermal anomaly level comprising a primary thermal anomaly and a secondary thermal anomaly, a thermal anomaly of a first battery device comprising a thermal anomaly of a first sub-battery device and the thermal anomaly of the first sub-battery device propagating to a second sub-battery device, the secondary thermal anomaly being used to indicate that the thermal anomaly of the first battery device propagates to a second battery device, wherein the plurality of battery devices comprise a first battery device and a second battery device, the first battery device comprises a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each comprise at least one battery cell.

[0007] In the embodiment of the present application, based on the status parameter information of the battery cells in the sub-battery device, it is possible to timely and accurately detect thermal anomalies in the battery device, such as whether the thermal anomaly is spreading between the battery devices or between the sub-battery devices, so that timely responses and operations can be made when the battery has thermal anomalies, thereby improving the performance and service life of the battery and reducing the impact of the battery thermal anomaly, such as the possibility of causing a fire or explosion.

[0008] In a possible implementation manner, the state parameter information includes voltage information and / or temperature information.

[0009] In the embodiments of the present application, the level of thermal anomaly in the battery device can be detected timely and accurately based on the voltage information and / or temperature information of the battery cells in the sub-battery device, so that timely response and operation can be made when the battery has thermal anomaly, thereby improving the performance and service life of the battery and reducing the impact of the battery thermal anomaly, such as the possibility of causing fire or explosion.

[0010] In a possible implementation, determining the thermal anomaly level of the battery device according to the state parameter information includes: determining that a first-level thermal anomaly occurs in the battery device when voltage information and / or temperature information of a battery cell in a first battery device is within a first target range.

[0011] In an embodiment of the present application, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, it can be determined that a first-level thermal anomaly occurs in the battery device, and whether a thermal anomaly occurs in the battery device can be detected in a timely and accurate manner.

[0012] In one possible implementation, the thermal anomaly level of the battery device is determined based on the status parameter information, including: when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determining the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range; when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range is greater than or equal to the first target number, determining that a secondary thermal anomaly has occurred in the battery device.

[0013] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first battery device is within the first target range and the number of second battery devices whose voltage information and / or temperature information of the battery cell is within the second target range is greater than or equal to the first target number, it is determined that the battery device has a secondary thermal anomaly. That is, based on the voltage information and / or temperature information of the first battery device and the second battery device, it can be timely and accurately determined whether the thermal anomaly of the first battery device has spread to the second battery device, so that the first battery device and the second battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0014] In one possible implementation, determining the thermal anomaly level of the battery device based on the status parameter information includes: when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determining the number of second battery devices whose voltage information and / or temperature information of the battery cells satisfies the first preset range; when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the first preset range is greater than or equal to the first preset number, determining that the battery device has a second-level mild thermal anomaly, and the second-level thermal anomaly includes a second-level mild thermal anomaly.

[0015] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first battery device is within the first target range and the number of second battery devices whose voltage information and / or temperature information of the battery cell is within the first preset range is greater than or equal to the first preset number, it is determined that the battery device has a secondary mild thermal anomaly. That is, based on the voltage information and / or temperature information of the first battery device and the second battery device, it can be timely and accurately determined whether the thermal anomaly of the first battery device has slightly spread to the second battery device, so that the first battery device and the second battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0016] In one possible implementation, determining the thermal anomaly level of a battery device based on status parameter information includes: determining the number of second battery devices whose voltage information and / or temperature information of the battery cells are within a second preset range when voltage information and / or temperature information of the battery cells in a first battery device is within a first target range; and determining that a second-level severe thermal anomaly occurs in the battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second preset range is greater than or equal to a second preset number. The second-level thermal anomaly includes a second-level severe thermal anomaly.

[0017] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first battery device is within the first target range and the number of second battery devices whose voltage information and / or temperature information of the battery cell is within the second preset range is greater than or equal to the second preset number, it is determined that the battery device has a secondary severe thermal anomaly. That is, based on the voltage information and / or temperature information of the first battery device and the second battery device, it can be timely and accurately determined whether the thermal anomaly of the first battery device has seriously spread to the second battery device, so that the first battery device and the second battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0018] In a possible implementation manner, the first battery device is adjacent to the second battery device.

[0019] In the embodiment of the present application, since the heat of the first battery device will preferentially diffuse to other adjacent battery devices when the first battery device is thermally abnormal, if the first battery device is adjacent to the second battery device, it is possible to more accurately determine whether the battery device has a secondary thermal abnormality, thereby reducing misjudgment of the thermal abnormality level.

[0020] In a possible implementation, determining that a primary thermal anomaly occurs in the battery device includes: determining that a thermal anomaly occurs in the first sub-battery device when voltage information and / or temperature information of a battery cell in the first sub-battery device is within a third preset range.

[0021] In the embodiment of the present application, whether a thermal anomaly occurs in the first sub-battery device can be detected timely and accurately based on the relationship between the voltage information and / or temperature information of the battery cells in the first sub-battery device and the third preset range.

[0022] In one possible implementation, determining that a first-level thermal anomaly has occurred in a battery device includes: determining the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the third preset range or the fourth preset range when voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and determining that the thermal anomaly of the first sub-battery device has spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range or the fourth preset range is greater than or equal to a second target number.

[0023] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first sub-battery device is within the third preset range and the number of second sub-battery devices whose voltage information and / or temperature information is within the third preset range or the fourth preset range is greater than or equal to the second target number, it is determined that the thermal anomaly has spread between the sub-battery devices. That is, it is possible to timely and accurately determine whether the thermal anomaly of the first sub-battery device has spread to the second sub-battery device based on the voltage information and / or temperature information of the first sub-battery device and the second sub-battery device, so that the first sub-battery device and the second sub-battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0024] In one possible implementation, determining that a first-level thermal anomaly has occurred in a battery device includes: determining the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within a fourth preset range when voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and determining that the thermal anomaly of the first sub-battery device has slightly spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the fourth preset range is greater than or equal to the third preset number.

[0025] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell of the first sub-battery device is within the third preset range and the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cell is within the fourth preset range is greater than or equal to the third preset number, it is determined that a slight thermal anomaly occurs between the sub-battery devices. That is, it is possible to timely and accurately determine whether the thermal anomaly of the first sub-battery device slightly spreads to the second battery device based on the voltage information and / or temperature information of the first sub-battery device and the second sub-battery device, so that the first sub-battery device and the second sub-battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0026] In one possible implementation, determining that a first-level thermal anomaly has occurred in a battery device includes: determining the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the third preset range when voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and determining that the thermal anomaly of the first sub-battery device has severely spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range is greater than or equal to a fourth preset number.

[0027] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first sub-battery device is within the third preset range and the number of second sub-battery devices whose voltage information and / or temperature information is within the third preset range is greater than or equal to the fourth preset number, it is determined that a severe thermal anomaly occurs between the sub-battery devices. That is, it is possible to timely and accurately determine whether the thermal anomaly of the first sub-battery device has seriously spread to the second sub-battery device based on the voltage information and / or temperature information of the battery cells of the first sub-battery device and the second sub-battery device, so that the first sub-battery device and the second sub-battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0028] In a possible implementation manner, the first sub-battery device and the second sub-battery device are adjacent to each other.

[0029] In the embodiment of the present application, since the heat of the first sub-battery device will preferentially diffuse to other adjacent sub-battery devices when the first sub-battery device is thermally abnormal, if the first sub-battery device is adjacent to the second sub-battery device, it is possible to more accurately determine whether the thermal abnormality is spreading between the sub-battery devices.

[0030] In a possible implementation, the voltage information and / or temperature information of the battery cell in the first preset range or the voltage information and / or temperature information of the battery cell in the fourth preset range includes one or more of the following: a), N T≥T2 ≥N1 and lasts for Δt2; b), N Kn≥K2 ≥N2 and lasts for Δt2; c), N V≤V2 ≥N3 and lasts for Δt2 or N V failed ≥ N3 and lasts for Δt2, where N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells greater than or equal to K2, K2 is the second preset temperature rise rate, N2 is the second preset number, N V≤V2 is the number of battery cells whose voltage V is less than or equal to V2, V2 is the second preset voltage, N V failed is the number of battery cells whose voltage signals cannot be collected, and N3 is a third preset number.

[0031] In a possible implementation, the voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes: N T≥T2 ≥N1 and N Kn≥K2 ≥N2, lasting Δt2, where N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells is greater than or equal to K2, K2 is the second preset temperature rise rate, and N2 is the second preset number.

[0032] In an embodiment of the present application, one or more of the minimum voltage, maximum temperature, minimum temperature of multiple battery cells in a sub-battery device or a battery device, the temperature rise rate of the battery cell, whether a voltage signal can be collected, the final temperature of the battery cell within Δt1, the average temperature within Δt1, and other information are used as the voltage information and / or temperature information of the battery cell, which can improve the accuracy of thermal anomaly detection in the battery device.

[0033] In a possible implementation, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a), V min ≤V1 and lasts for Δt1; b), T max ≥T1 and lasts for Δt1; c), T max -T min ≥ΔT1 and lasts for Δt1; d) There is a battery cell K m ≥K1 and lasts for Δt1; e) T of the battery cell exists 终 -T avg ≥ΔT2 and lasts for Δt1; f), there is a battery cell that cannot collect voltage signals and lasts for Δt1, where V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0034] In a possible implementation, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a), V min ≤V1 and T max ≥T1, lasting Δt1; b), V min ≤V1, K of battery cell exists m ≥K1 and T of battery cells exists 终 -T avg ≥ΔT2, lasting Δt1; c), V min ≤V1,T max -T min ≥ΔT1 and T max ≥T1, lasting Δt1; d), T max ≥T1 and there is a battery cell K m ≥K1, lasting Δt1; e), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell K m ≥K1, lasting Δt1; f), T max≥T1 and there is a battery cell that cannot collect voltage signals for Δt1; g) There is a battery cell K m ≥K1, T of battery cells exists 终 -T avg ≥ΔT2 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1; h), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell that cannot collect voltage signals for Δt1, where V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0035] In an embodiment of the present application, one or more of the temperature, temperature rise rate, voltage of a battery cell in a sub-battery device or a battery device, or whether a voltage signal is collected can be used as voltage information and / or temperature information of the battery cell, which can improve the accuracy of thermal anomaly detection of the battery device.

[0036] In a second aspect, a device for detecting thermal anomalies of a battery device is provided, the detection device comprising: an acquisition unit, for acquiring status parameter information of battery cells in a plurality of battery devices; a processing unit, for determining a thermal anomaly level of the battery device according to the status parameter information, the thermal anomaly level comprising a primary thermal anomaly and a secondary thermal anomaly, the primary thermal anomaly being used to indicate a thermal anomaly of a first battery device, the thermal anomaly of the first battery device comprising a thermal anomaly of a first sub-battery device and the thermal anomaly of the first sub-battery device spreading to a second sub-battery device, the secondary thermal anomaly being used to indicate that the thermal anomaly of the first battery device has spread to a second battery device, wherein the plurality of battery devices comprise a first battery device and a second battery device, the first battery device comprises a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each comprise at least one battery cell.

[0037] In a possible implementation manner, the state parameter information includes voltage information and / or temperature information.

[0038] In a possible implementation, the processing unit is configured to determine that a first-level thermal anomaly occurs in the battery device when voltage information and / or temperature information of a battery cell in the first battery device is within a first target range.

[0039] In one possible implementation, the processing unit is used to determine the number of second battery devices whose voltage information and / or temperature information of the battery cells in the first battery device is within a first target range when the voltage information and / or temperature information of the battery cells is within a first target range; and determine that a secondary thermal anomaly has occurred in the battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range is greater than or equal to the first target number.

[0040] In one possible implementation, the processing unit is used to determine the number of second battery devices whose voltage information and / or temperature information of the battery cells in the first battery device is within a first target range; and to determine that a secondary mild thermal anomaly occurs in the battery device when the voltage information and / or temperature information of the battery cells is within a first target range; the secondary mild thermal anomaly includes a secondary mild thermal anomaly.

[0041] In one possible implementation, the processing unit is used to determine the number of second battery devices whose voltage information and / or temperature information of the battery cells are within a second preset range when the voltage information and / or temperature information of the battery cells in the first battery device is within a first target range; and determine that a secondary severe thermal anomaly occurs in the battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second preset range is greater than or equal to the second preset number.

[0042] In a possible implementation manner, the first battery device is adjacent to the second battery device.

[0043] In a possible implementation, the processing unit is configured to determine that a thermal abnormality occurs in the first sub-battery device when voltage information and / or temperature information of a battery cell in the first sub-battery device is within a third preset range.

[0044] In one possible implementation, the processing unit is used to determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within a third preset range or a fourth preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and to determine that the thermal abnormality of the first sub-battery device has spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range or the fourth preset range is greater than or equal to a second target number.

[0045] In one possible implementation, the processing unit is used to determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within a fourth preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and to determine that the thermal anomaly of the first sub-battery device has slightly spread to the second sub-battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the fourth preset range is greater than or equal to the third preset number.

[0046] In one possible implementation, the processing unit is used to: determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within a third preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and determine that the thermal anomaly of the first sub-battery device has severely spread to the second sub-battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range is greater than or equal to a fourth preset number.

[0047] In a possible implementation manner, the first sub-battery device and the second sub-battery device are adjacent to each other.

[0048] In a possible implementation, the voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes one or more of the following: a), N T≥T2 ≥N1 and lasts for Δt2; b), N Kn≥K2 ≥N2 and lasts for Δt2; c), N V≤V2 ≥N3 and lasts for Δt2 or N V failed ≥ N3 and lasts for Δt2, where N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells greater than or equal to K2, K2 is the second preset temperature rise rate, N2 is the second preset number, N V≤V2 is the number of battery cells whose voltage V is less than or equal to V2, V2 is the second preset voltage, N V failed is the number of battery cells whose voltage signals cannot be collected, and N3 is a third preset number.

[0049] In a possible implementation, the voltage information and / or temperature information of the battery cell within the first preset range or the fourth preset range includes: T≥T2 ≥N1 and N Kn≥K2 ≥N2, lasting Δt2, where N T≥T2is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells is greater than or equal to K2, K2 is the second preset temperature rise rate, and N2 is the second preset number.

[0050] In a possible implementation, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a), V min ≤V1 and lasts for Δt1; b), T max ≥T1 and lasts for Δt1; c), T max -T min ≥ΔT1 and lasts for Δt1; d) There is a battery cell K m ≥K1 and lasts for Δt1; e) T of the battery cell exists 终 -T avg ≥ΔT2 and lasts for Δt1; f), there is a battery cell that cannot collect voltage signals and lasts for Δt1, where V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0051] In a possible implementation, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a), V min ≤V1 and T max ≥T1, lasting Δt1; b), V min ≤V1, K of battery cell exists m ≥K1 and T of battery cells exists 终 -T avg ≥ΔT2, lasting Δt1; c), V min ≤V1,T max -T min ≥ΔT1 and T max ≥T1, lasting Δt1; d), T max ≥T1 and there is a battery cell K m≥K1, lasting Δt1; e), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell K m ≥K1, lasting Δt1; f), T max ≥T1 and there is a battery cell that cannot collect voltage signals for Δt1; g) There is a battery cell K m ≥K1, T of battery cells exists 终 -T avg ≥ΔT2 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1; h), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell that cannot collect voltage signals for Δt1, where V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0052] In a third aspect, a device for detecting thermal anomalies of a battery device is provided, the detection device comprising a memory and a processor, the memory being used to store instructions, the processor being used to read instructions and execute, according to the instructions, a detection method as in the first aspect and any possible implementation of the first aspect.

[0053] In a fourth aspect, an energy storage device is provided, which includes an electrical device and a detection device as in any possible implementation of the second aspect or the third aspect.

[0054] In a fifth aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes a detection method as in the first aspect and any possible implementation of the first aspect.

[0055] In a sixth aspect, a computer program is provided. When the computer program is executed by a computer, the computer implements the detection method in the first aspect and any possible implementation of the first aspect.

[0056] In the seventh aspect, a computer-readable storage medium is provided, which is used to store a computer program. When the computer program is executed by a computer, the computer implements the detection method in the first aspect and any possible implementation method of the first aspect.

[0057] In an eighth aspect, a computer program product is provided, comprising computer program instructions, which, when executed by a computer, enable the computer to implement the detection method in the first aspect and any possible implementation of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A schematic diagram of the structure of an energy storage container provided in an embodiment of the present application.

[0059] Figure 2 for Figure 1 Schematic diagram of the structure of the A-A' section of the energy storage container.

[0060] Figure 3 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0061] Figure 4 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0062] Figure 5 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0063] Figure 6 A schematic diagram of abnormal heat propagation between battery devices provided in an embodiment of the present application.

[0064] Figure 7 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0065] Figure 8 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0066] Fig. 9 A schematic diagram of abnormal heat propagation between sub-battery devices provided in an embodiment of the present application.

[0067] Fig.10 It is a schematic block diagram of a device for detecting thermal anomalies of a pool device provided in an embodiment of the present application.

[0068] Fig.11 It is another schematic block diagram of the device for detecting thermal anomaly of a pool device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0070] In the description of the embodiments of the present application, in the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0071] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0072] The term "and / or" is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0073] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0074] Due to its advantages such as high energy density, rechargeable, safety and environmental protection, batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0075] Under the influence of overcharge, overdischarge, overheating, mechanical collision and other factors, the battery may experience thermal anomalies, such as the temperature inside the battery may continue to rise, leading to thermal runaway. When one or more battery cells experience thermal runaway, the heat will be transferred to adjacent battery cells or other adjacent devices, affecting the performance and service life of adjacent battery cells or other devices, and may even cause fire or explosion at any time.

[0076] Therefore, timely and accurate detection of battery thermal anomalies is necessary so that timely responses and operations can be made when the battery thermal anomalies occur, thereby improving the performance and service life of the battery and reducing the impact of battery thermal anomalies, such as the possibility of causing fire or explosion.

[0077] Based on the above problems, an embodiment of the present application provides a method and a device for detecting thermal anomalies of a battery device, wherein the battery device includes one or more battery cells, and the detection method includes: obtaining status parameter information of the battery cells in the multiple battery devices; determining the thermal anomaly level of the battery device according to the status parameter information, the thermal anomaly level including a first-level thermal anomaly and a second-level thermal anomaly, a thermal anomaly of a first battery device including a thermal anomaly of a first sub-battery device and the thermal anomaly of the first sub-battery device spreading to a second sub-battery device, the second-level thermal anomaly is used to indicate that the thermal anomaly of the first battery device spreads to the second battery device, wherein the multiple battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0078] The battery device thermal anomaly detection method and monitoring device provided in the embodiments of the present application can timely and accurately detect the occurrence of thermal anomalies in the battery device, such as whether the thermal anomaly is spreading between battery devices or between sub-battery devices, so that timely responses and operations can be made when the battery device has thermal anomalies, thereby improving the performance and service life of the battery and reducing the impact of the battery thermal anomaly, such as the possibility of causing fire or explosion.

[0079] Figure 1 This is a schematic diagram of the appearance of an energy storage container 1 applicable to the present application.

[0080] The energy storage container 1 is an energy storage device with a relatively high degree of integration. The interior of the energy storage container 1 is a hollow structure, which may include a plurality of compartments, for example, for accommodating a plurality of electrical cabinets.

[0081] In some embodiments, the energy storage container 1 may include multiple electrical cabinets, which may include a cabinet body and at least one electrical box, which may include a box body and at least one battery cell. In the application embodiment, the electrical cabinet may also be referred to as a battery cluster, and the electrical box may also be referred to as a battery.

[0082] The cabinet of the electric cabinet is used to enclose one or more batteries. Multiple batteries can be connected in parallel, in series, or in series-parallel. For example, multiple batteries can be connected to the main control component through a busbar component, and the main control component realizes the electrical connection between the multiple batteries.

[0083] The battery box is used to encapsulate one or more battery cells. Optionally, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which is not limited in the present embodiment. The battery cell may be cylindrical, flat, rectangular, or in other shapes, which is not limited in the present embodiment.

[0084] In some embodiments, the warehouse body may include a battery compartment for accommodating batteries. In addition, the interior of the energy storage container 1 may be divided into multiple functional compartments according to actual needs, and each functional compartment is provided with other functional equipment components for managing or assisting the multiple batteries, such as: a converging component, a main control component, a thermal management component, etc.

[0085] In some embodiments, the thermal management component may include an air conditioning component, a fan component, a water cooling pipe, etc., which can be used to perform thermal management on the interior of the energy storage container 1 to adjust the temperature inside the energy storage container 1 .

[0086] In some embodiments, the energy storage container 1 may further include a fire protection system for performing fire protection operations on the energy storage container 1 such as alarming, cooling or fire extinguishing.

[0087] In some embodiments, the energy storage container 1 may be a regular rectangular parallelepiped structure, which facilitates the fixed placement and transportation of the energy storage container 1 .

[0088] It should be understood that Figure 1 The components shown are only examples. In actual applications, the components may have different names or may be replaced according to actual needs. Figure 1 Add or delete components in the

[0089] Figure 2 for Figure 1 Schematic diagram of the A-A' section of the energy storage container 1.

[0090] In some embodiments, the energy storage container 1 includes an electric cabinet 10 and a housing 20. The electric cabinet 10 may include a cabinet body 110 and a plurality of electric boxes 120. The electric box 120 may include a box body 121 and at least one battery cell 122.

[0091] In some embodiments, the energy storage container 1 may further include a master control unit. The master control unit may serve as a management unit of the energy storage container 1, and may monitor and manage the energy storage container 1. For example, the charging and discharging of the energy storage container 1 may be controlled by monitoring the status information of the energy storage container 1, such as current, voltage, temperature, or power.

[0092] In some embodiments, the energy storage container 1 may further include a main control unit, which may serve as a management unit of the electric cabinet 10 and may monitor and manage the electric cabinet 10. For example, the charging and discharging of the electric cabinet 10 may be controlled by monitoring the status information of the electric cabinet 10, such as current, voltage, temperature, or power. In some embodiments, the main control unit may also communicate with the master control unit, such as sending the status information of the electric cabinet 10 to the master control unit.

[0093] In some embodiments, the energy storage container 1 may further include a slave control unit, which may collect status information of the battery cell 122, such as current, voltage, temperature or power. In some embodiments, the slave control unit may also communicate with the master control unit and / or the master control unit, for example, the status information of the battery cell 122 may be sent to the master control unit and / or the master control unit.

[0094] It should be understood that Figure 2 The components shown are only examples. In actual applications, the components may have different names or may be replaced according to actual needs. Figure 1 Add or delete components in the

[0095] Figure 3 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application. The plurality of battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0096] Figure 3 The detection method shown can be applied to Figure 1 or Figure 2 Energy storage container shown.

[0097] For example, the battery device may be an energy storage container, and the sub-battery device may be an electrical cabinet. Alternatively, the battery device may be an electrical cabinet, and the sub-battery device may be an electrical box. Alternatively, the battery device may be an energy storage device including multiple containers, and the sub-battery device may be an energy storage container, etc.

[0098] 310, obtaining status parameter information of battery cells in a plurality of battery devices.

[0099] For example, during the use of a battery device, due to certain reasons such as overcharging and discharging, collision, internal short circuit of the battery, etc., the temperature and / or heating rate of the battery device increases abnormally, which may cause thermal abnormalities in the battery device, such as impending thermal runaway, possible thermal runaway, or thermal runaway.

[0100] When one or more battery cells have thermal anomalies, their heat may be transferred to surrounding battery cells, surrounding sub-battery devices or surrounding battery devices, thereby causing the surrounding battery cells, sub-battery devices or battery devices to also have thermal anomalies.

[0101] When a battery device has a thermal anomaly, one or more of the state parameter information of the battery cells in the battery device, such as the current information, voltage information, temperature information, pressure information, or smoke concentration information in the battery, will change. That is, the state parameter information of the battery cells can reflect the thermal anomaly of the battery device. Therefore, in some embodiments, the state parameter information of the battery cells may include one or more of the current information, voltage information, temperature information, pressure information, or smoke concentration information in the battery, etc.

[0102] For example, the voltage of each battery cell can be collected through the low voltage monitoring system, and a temperature sensor can be set every few battery cells to collect the temperature of the battery cells. The low voltage monitoring system and the temperature sensor can send the collected voltage information and / or temperature information to the slave control unit of the energy storage container 1 respectively, and the slave control unit can send the voltage information and / or the temperature information to the master control unit of the energy storage container 1 through the master control unit of the energy storage container 1.

[0103] 320 , determining a thermal anomaly level of the battery device according to the state parameter information.

[0104] The thermal anomaly levels include a first-level thermal anomaly and a second-level thermal anomaly. The first-level thermal anomaly is used to indicate a thermal anomaly of the first battery device. The thermal anomaly of the first battery device includes a thermal anomaly of the first sub-battery device and the thermal anomaly of the first sub-battery device spreading to the second sub-battery device. The second-level thermal anomaly is used to indicate that the thermal anomaly of the first battery device spreads to the second battery device.

[0105] Exemplarily, a battery device has a thermal anomaly, and it is considered that the battery device has a first-level thermal anomaly. For example, a first battery device has a thermal anomaly. The first battery device has a thermal anomaly in two cases: one case is that a first sub-battery device in the first battery device has a thermal anomaly. In another case, the thermal anomaly of the first sub-battery device in the first battery device spreads to the second sub-battery device.

[0106] For example, if a battery device has a thermal anomaly, and the heat of the battery device spreads, for example, is transferred to surrounding battery devices, causing the surrounding battery devices to also have thermal anomalies, for example, the temperature rises above a certain temperature, it can be considered that the battery device has a secondary thermal anomaly. For example, the thermal anomaly of the first battery device spreads to the second battery device.

[0107] In the embodiment of the present application, based on the status parameter information of the battery cells in the battery device, it is possible to timely and accurately detect thermal anomalies in the battery device, such as whether the thermal anomaly is spreading between the battery devices or between the sub-battery devices, so that timely responses and operations can be made when the battery has thermal anomalies, thereby improving the performance and service life of the battery and reducing the impact of the battery thermal anomaly, such as the possibility of causing a fire or explosion.

[0108] In some embodiments, the state parameter information of the battery cell may include voltage information and / or temperature information of the battery cell.

[0109] In the embodiments of the present application, the level of thermal anomaly in the battery device can be detected timely and accurately based on the voltage information and / or temperature information of the battery cells in the battery device, so that timely response and operation can be made when the battery has thermal anomaly, thereby improving the performance and service life of the battery and reducing the impact of the battery thermal anomaly, such as the possibility of causing fire or explosion.

[0110] Combine as follows Figures 4 to 9 , taking the state parameter information including voltage information and / or temperature information as an example, the method for detecting thermal anomaly of a battery device provided in an embodiment of the present application is further exemplarily introduced.

[0111] Figure 4 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0112] 410 , obtaining voltage information and / or temperature information of battery cells in a plurality of battery devices.

[0113] The plurality of battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0114] For the content of obtaining the voltage information and / or temperature information of the battery cells in the battery device, reference may be made to the relevant description in step 310 and above, and the present application will not elaborate on it here.

[0115] 420a, when the voltage information and / or temperature information of the battery cells in the first battery device is within a first target range, determining that a first-level thermal abnormality occurs in the battery device.

[0116] In the embodiment of the present application, the occurrence of a primary thermal anomaly in a battery device may refer to the occurrence of a thermal anomaly in a first battery device. The occurrence of a thermal anomaly in the first battery device includes two situations: one situation is that a thermal anomaly occurs in a first sub-battery device in the first battery device. In another situation, the thermal anomaly of the first sub-battery device in the first battery device spreads to the second sub-battery device.

[0117] In some embodiments, the first target range may be determined based on a critical value at which a thermal abnormality occurs, is about to occur, or may occur in the first battery device.

[0118] Exemplarily, when the temperature information of multiple battery cells in the first battery device is greater than or equal to a certain temperature, the first battery device has a thermal anomaly such as thermal runaway. The first target range can be determined based on the certain temperature. For example, the first target range is greater than or equal to the certain temperature, that is, when the temperature of the battery cells in the first battery device is greater than or equal to the certain temperature, it is determined that the battery device has a first-level thermal anomaly.

[0119] In an embodiment of the present application, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, it can be determined that a first-level thermal anomaly occurs in the battery device, and whether a thermal anomaly occurs in the battery device can be detected in a timely and accurate manner.

[0120] 420b, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determine the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range.

[0121] 430b, when the voltage information and / or temperature information of the battery cell satisfies that the number of second battery devices within the second target range is greater than or equal to the first target number, determine that a secondary thermal abnormality occurs in the battery device.

[0122] In the embodiment of the present application, the secondary thermal anomaly refers to the thermal anomaly of the first battery device spreading to the second battery device, causing the second battery device to also have a thermal anomaly, causing the voltage information and / or temperature information of the second battery device to change. For example, the first battery device is in thermal runaway, and its heat diffuses into the second battery device, causing the voltage information and / or temperature information of the second battery device to change. This change is different from the change of the voltage information and / or temperature information of the second battery device during normal use. For example, the temperature change of the second battery device caused by the thermal spread is faster and the change amount is larger than the temperature change of the second battery device during use.

[0123] In some embodiments, the second target range corresponding to the second battery device may be determined according to changes in voltage information and / or temperature information of the first battery device, as well as the model or usage condition of the second battery device.

[0124] In some embodiments, the first target number may be an integer greater than or equal to 1.

[0125] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first battery device is within the first target range and the number of second battery devices whose voltage information and / or temperature information of the battery cell is within the second target range is greater than or equal to the first target number, it is determined that the battery device has a secondary thermal anomaly. That is, based on the voltage information and / or temperature information of the first battery device and the second battery device, it can be timely and accurately determined whether the thermal anomaly of the first battery device has spread to the second battery device, so that the first battery device and the second battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0126] In some embodiments, the occurrence of a secondary thermal anomaly in a battery device (a thermal anomaly in a first battery device spreads to a second battery device) may include different situations: for example, a secondary mild thermal anomaly, i.e., a thermal anomaly in a first battery device spreads slightly to a second battery device. For example, a secondary severe thermal anomaly, i.e., a thermal anomaly in a first battery device spreads severely to a second battery device. Figure 5 The situation where a secondary thermal anomaly occurs in the battery in the embodiment of the present application (steps 520b, 530b, 520c and 530c) is exemplarily introduced.

[0127] Figure 5 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application.

[0128] 510 , obtaining voltage information and / or temperature information of battery cells in a plurality of battery devices.

[0129] The plurality of battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0130] For the content of obtaining the voltage information and / or temperature information of the battery cells in the plurality of battery devices, reference may be made to step 310 and the related descriptions above, which will not be elaborated in the present application.

[0131] At 520a, when the voltage information and / or the temperature information of the battery cells in the first battery device are within a first target range, it is determined that a first-level thermal abnormality occurs in the battery device.

[0132] The content of step 520a can refer to the relevant description in step 420a, and this application will not elaborate on it here.

[0133] 520b, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determine the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the first preset range.

[0134] 530b, when the number of second battery devices whose voltage information and / or temperature information of the battery cells are within the first preset range is greater than or equal to the first preset number, it is determined that a secondary mild thermal anomaly occurs in the battery device.

[0135] In an embodiment of the present application, a secondary mild thermal anomaly refers to a thermal anomaly of the first battery device that spreads relatively slightly to the second battery device. When a thermal anomaly occurs in the first battery device, and the thermal anomaly of the first battery device spreads to the second battery device, the degree of thermal anomaly of the second battery device may be lighter than that of the first battery device. For example, thermal runaway occurs in the first battery device and spreads to the second battery device, and the second battery device does not experience thermal runaway but its temperature rises significantly. Therefore, the first target range is different from the first preset range, and the degree of thermal anomaly of the battery device whose voltage information and / or current information of the battery cell is within the first target range is more serious than the voltage information and / or current information of the battery cell is within the first preset range.

[0136] For example, if the temperature of a battery cell in a first battery device is greater than or equal to a first temperature, it is considered that a thermal anomaly occurs in the first battery device. If the temperature of a battery cell in a second battery device is greater than or equal to a second temperature, it is considered that the thermal anomaly of the first battery device spreads to the second battery device. Here, the first temperature may be greater than the second temperature.

[0137] In some embodiments, the first preset number may be an integer greater than or equal to 1.

[0138] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first battery device is within the first target range and the number of second battery devices whose voltage information and / or temperature information of the battery cell is within the first preset range is greater than or equal to the first preset number, it is determined that the battery device has a secondary mild thermal anomaly. That is, based on the voltage information and / or temperature information of the first battery device and the second battery device, it can be timely and accurately determined whether the thermal anomaly of the first battery device has slightly spread to the second battery device, so that the first battery device and the second battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0139] 520c, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determine the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second preset range.

[0140] 530c, when the number of second battery devices whose voltage information and / or temperature information of the battery cells are within the second preset range is greater than or equal to the second preset number, determine that a second-level severe thermal anomaly occurs in the battery device.

[0141] In the embodiment of the present application, the second-level severe thermal anomaly refers to that the thermal anomaly seriously spreads between the first battery device and the second battery device. For example, the thermal anomaly of the first battery device may spread more seriously to the second battery device.

[0142] When a thermal anomaly occurs in the first battery device and spreads to the second battery device, the degree of thermal anomaly of the first battery device is comparable to that of the second battery device, and both have relatively serious thermal anomalies such as thermal runaway.

[0143] As an example, the first target range and the first preset range may be the same range. For example, if the temperature of the battery cell in the first battery device is greater than or equal to the first temperature, it is considered that the first battery device has a thermal anomaly. And if the temperature of the battery cell in the second battery device is greater than or equal to the first temperature, it is considered that the thermal anomaly of the first battery device has spread to the second battery device.

[0144] If the first target range and the first preset range are the same range, it can be determined that the thermal anomaly of the first battery device has spread to the second battery device based on the relative positions of the battery devices, or the order in which the voltage information and / or temperature information of the battery cells in the battery devices meet certain conditions (such as the first target condition or the first preset condition).

[0145] For example, based on the change of the voltage information and / or temperature information of the battery cells in the first battery device and the second battery device, it can be determined that the thermal anomaly of the first battery device has spread to the second battery device. For example, if the voltage information and / or temperature information of the battery cells in the first battery device reaches the first target range before the second battery device, it is considered that the thermal anomaly of the first battery device has spread to the second battery device.

[0146] For another example, it is also possible to determine whether the thermal anomaly of the first battery device has spread to the second battery device based on the relative positions of the first battery device and the second battery device. For example, if the voltage information and / or temperature information of the battery cells of three battery devices are all within the first target range, if one battery device is flanked by two other battery devices, it can be considered that the thermal anomaly of the one battery device has spread to the other two battery devices.

[0147] In some embodiments, the second preset number may be an integer greater than or equal to 1.

[0148] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first battery device is within the first target range and the number of second battery devices whose voltage information and / or temperature information of the battery cell is within the second preset range is greater than or equal to the second preset number, it is determined that the battery device has a secondary thermal anomaly. That is, based on the voltage information and / or temperature information of the first battery device and the second battery device, it is possible to timely and accurately determine whether the thermal anomaly of the first battery device has spread to the second battery device, so that the first battery device and the second battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0149] In some embodiments, the first battery device is adjacent to the second battery device.

[0150] When an abnormality occurs in a battery device, the heat usually spreads to surrounding battery devices, such as adjacent battery devices.

[0151] For example, Figure 6 As shown, when a first-level thermal anomaly occurs in a first battery device, such as when a thermal anomaly occurs in an electric cabinet, its heat will spread to its adjacent second battery device (adjacent electric cabinet).

[0152] In the embodiment of the present application, since the heat of the first battery device will preferentially diffuse to other adjacent battery devices when the first battery device is thermally abnormal, if the first battery device is adjacent to the second battery device, it is possible to more accurately determine whether the battery device has a secondary thermal abnormality, thereby reducing misjudgment of the thermal abnormality level.

[0153] In some embodiments, when a primary thermal abnormality occurs in the battery device, step 530a may continue to be executed.

[0154] 530a, sending the information of the first-level thermal anomaly to the fire protection system of the battery device.

[0155] Exemplarily, the information of the first-level thermal anomaly includes the serial number of the first battery device.

[0156] In some embodiments, when a secondary mild thermal anomaly occurs in the battery device, step 540b may continue to be executed.

[0157] 540b, sending the information of the second-level mild thermal anomaly to the fire protection system of the battery device.

[0158] Exemplarily, the information of the second-level mild thermal anomaly includes serial numbers of the first battery device and the second battery device.

[0159] In some embodiments, when a secondary severe thermal abnormality occurs in the battery device, step 540c may continue to be performed.

[0160] 540c, sending a second-level severe thermal anomaly information to the fire protection system of the battery device.

[0161] Exemplarily, the information of the second-level severe thermal anomaly includes serial numbers of the first battery device and the second battery device.

[0162] In some embodiments, the occurrence of a primary thermal anomaly in the first battery device may include different situations: for example, a thermal anomaly occurs in a first sub-battery device in the first battery device. For example, a thermal anomaly occurs in a first sub-battery device in the first battery device, and the thermal anomaly of the first sub-battery device spreads. Figure 7 Different situations (such as steps 720 a , 720 b , and 730 b ) in which a first-level thermal anomaly occurs in the first battery device are exemplarily introduced.

[0163] Figure 7 A schematic flow chart of a method for detecting thermal anomalies of a battery provided in an embodiment of the present application.

[0164] 710 , obtaining voltage information and / or temperature information of battery cells in a plurality of battery devices.

[0165] The plurality of battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0166] For the content of obtaining the voltage information and / or temperature information of the battery cells in the plurality of battery devices, reference may be made to step 310 and the related descriptions above, which will not be elaborated in the present application.

[0167] 720a, when the voltage information and / or the temperature information of the battery cells in the first sub-battery device is within a third preset range, determine that a thermal abnormality occurs in the first sub-battery device.

[0168] For example, during the use of the battery device, due to certain reasons such as overcharging and discharging, collision, internal short circuit of the battery, etc., the temperature and / or heating rate of a sub-battery device of the battery device increases abnormally, which may cause thermal abnormalities in the sub-battery device, such as impending thermal runaway, possible thermal runaway, or thermal runaway.

[0169] In some embodiments, the third preset range may be determined by a critical value at which the first sub-battery device has a thermal anomaly, is about to have a thermal anomaly, or may have a thermal anomaly.

[0170] Exemplarily, when the temperature information of the battery cell in the first sub-battery device is greater than or equal to a certain temperature, the first sub-battery device has a thermal anomaly such as thermal runaway. The first preset range can be determined based on the certain temperature. For example, the third preset range is a range greater than or equal to the certain temperature, that is, when the temperature of the battery cell in the first sub-battery device is greater than or equal to the certain temperature, it is determined that the first sub-battery device has a thermal anomaly.

[0171] In an embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first sub-battery device is within a third preset range, it can be determined that a thermal anomaly occurs in the first sub-battery device, thereby being able to timely and accurately detect whether a thermal anomaly occurs in the sub-battery device.

[0172] 720b, when the voltage information and / or temperature information of the battery cell in the first sub-battery device is within the third preset range, determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cell is within the third preset range or the fourth preset range.

[0173] 730b, when the number of second sub-battery devices within the third preset range or the fourth preset range of the battery cell voltage information and / or temperature information is greater than or equal to the second target number, determine that the thermal anomaly of the first sub-battery device spreads to the second sub-battery device.

[0174] In the case of a thermal anomaly in a sub-battery device in the first battery device, its heat can be transferred to the second sub-battery device around the first sub-battery device, causing the second sub-battery device around to also have thermal anomalies, and the voltage information and / or temperature information of the second sub-battery device will change. For example, the first sub-battery device is in thermal runaway, and its heat diffuses to the second sub-battery device, causing the voltage information and / or temperature information of the second sub-battery device to change. This change is different from the change of the voltage information and / or temperature information of the second sub-battery device during normal use. For example, when the second sub-battery device is spread by heat, its temperature changes faster and the amount of change is larger than that during normal use.

[0175] In some embodiments, the corresponding third preset range or fourth preset range of the second sub-battery device may be determined according to changes in voltage information and / or temperature information of the first sub-battery device, as well as the model or operating condition of the second sub-battery device.

[0176] In some embodiments, the second target number may be an integer greater than or equal to 1.

[0177] In the embodiment of the present application, when the voltage information and / or temperature information of the battery cell in the first sub-battery device is within the third preset range and the voltage information and / or temperature information of the battery cell is within the third target range or the number of second battery devices within the fourth range is greater than or equal to the second target number, it is determined whether the thermal anomaly spreads from the first sub-battery device to the second sub-battery device. That is, it is possible to timely and accurately determine whether the thermal anomaly of the first sub-battery device spreads to the second sub-battery device based on the voltage information and / or temperature information of the first sub-battery device and the second sub-battery device, so that the first sub-battery device and the second sub-battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0178] 720c, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determine the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range.

[0179] 730c, when the voltage information and / or temperature information of the battery cell satisfies that the number of second battery devices within the second target range is greater than or equal to the first target number, determine that a secondary thermal abnormality occurs in the battery device.

[0180] The contents of steps 720c and 730c can refer to the relevant descriptions of steps 420b and 430b and steps 520b, 530b, 520c and 530c, and will not be repeated in this application.

[0181] In some embodiments, when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range, the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within a fourth preset range is determined; when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the fourth preset range is greater than or equal to the third preset number, it is determined that the thermal anomaly of the first sub-battery device has slightly spread to the second sub-battery device.

[0182] In some embodiments, when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range, the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range is determined; when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range is greater than or equal to a fourth preset number, it is determined that the thermal anomaly of the first sub-battery device has severely spread to the second sub-battery device.

[0183] For further description of the above-mentioned thermal anomaly of the first sub-battery device slightly spreading to the second sub-battery device, or the thermal anomaly of the first sub-battery device severely spreading to the second sub-battery device, please refer to Figure 8 For the sake of brevity, this application will not go into details here.

[0184] Figure 8 A schematic flow chart of a method for detecting thermal anomalies of a battery device provided in an embodiment of the present application. The battery device includes one or more battery cells.

[0185] 810 , obtaining voltage information and / or temperature information of battery cells in a plurality of battery devices.

[0186] The plurality of battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0187] The content of step 810 can refer to the above step 310 and the related description above, and this application will not go into details here.

[0188] 820a, when the voltage information and / or the temperature information of the battery cells in the first sub-battery device is within a third preset range, determining that a thermal abnormality occurs in the first sub-battery device.

[0189] The content of step 810 can refer to the relevant description of step 720a above, and this application will not elaborate on it here.

[0190] 820b, when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range, determine the number of second sub-battery devices having the voltage information and / or temperature information of the battery cells within the fourth preset range.

[0191] 830b, when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the fourth preset range is greater than or equal to the third preset number, determine that the thermal anomaly of the first sub-battery device slightly spreads to the second sub-battery device.

[0192] When a sub-battery device has a thermal anomaly, its heat can be transferred to the surrounding sub-battery devices, causing the surrounding sub-battery devices to also have thermal anomalies. For example, when the low voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range, that is, when the first sub-battery device has a thermal anomaly, the thermal anomaly of the first sub-battery device spreads to the second sub-battery device, causing the voltage information and / or temperature information of the battery cells in the second sub-battery device to change to the fourth preset range, causing the second sub-battery device to also have a thermal anomaly.

[0193] When a thermal anomaly occurs in the first sub-battery device and the thermal anomaly of the first sub-battery device spreads to the second sub-battery device, the degree of thermal anomaly of the second sub-battery device may be less severe than that of the first sub-battery device. For example, the first sub-battery device has thermal runaway and spreads to the second sub-battery device, the second sub-battery device does not have thermal runaway but the temperature of its battery cell rises significantly, and this temperature rise is significantly different from the temperature rise of the second sub-battery device in normal use, such as the temperature rise of the second sub-battery device to which the heat spreads is significantly faster than the temperature rise of the second sub-battery device in normal use.

[0194] In the case where a thermal anomaly occurs in the first sub-battery device, that is, the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range, if the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the fourth preset range is greater than or equal to the third preset number, it is considered that the thermal anomaly of the first sub-battery device has spread to the second sub-battery device. Here, the degree of thermal anomaly of the second sub-battery device is lighter than that of the first sub-battery device, and therefore, the third preset range is different from the fourth preset range.

[0195] In some embodiments, the degree of thermal anomaly of the battery cell reflected by the boundary value of the third preset range is more serious than that of the fourth preset range. For example, if the temperature of the battery cell of the first sub-battery device is greater than or equal to the first temperature, it is considered that the first sub-battery device has a thermal anomaly. And if the temperature of the battery cell in the second sub-battery device is greater than or equal to the second temperature, it is considered that the thermal anomaly of the first sub-battery device has spread to the second sub-battery device. Here, the first temperature may be greater than the second temperature.

[0196] In some embodiments, the third preset number may be an integer greater than or equal to 1.

[0197] In the application embodiment, when a thermal anomaly occurs in the first sub-battery device and the number of second sub-battery devices whose voltage information and / or temperature information of the battery cell is within the third preset range is greater than or equal to the third preset number, it is determined that the thermal anomaly of the first sub-battery device spreads to the second sub-battery device. That is, it is possible to timely and accurately determine whether the thermal anomaly of the first sub-battery device slightly spreads to the second battery device based on the voltage information and / or temperature information of the first sub-battery device and the second sub-battery device, so that the first sub-battery device and the second sub-battery device can be operated in a targeted manner, such as fire fighting, to reduce the impact of the thermal anomaly of the battery device on its performance and life.

[0198] 820c, when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range, determine the number of second sub-battery devices having the voltage information and / or temperature information of the battery cells within the third preset range.

[0199] 830c, when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range is greater than or equal to a fourth preset number, determine that the thermal anomaly of the first sub-battery device has severely spread to the second sub-battery device.

[0200] When a sub-battery device has a thermal anomaly, its heat can be transferred to the surrounding sub-battery devices, causing the surrounding sub-battery devices to also have thermal anomalies. When a first sub-battery device has a thermal anomaly, and the thermal anomaly of the first sub-battery device spreads to a second sub-battery device, the degree of thermal anomaly of the second sub-battery device may be comparable to that of the first sub-battery device. For example, if the first sub-battery device has a thermal runaway and spreads to the second sub-battery device, the second sub-battery device also has a thermal runaway.

[0201] In some embodiments, the fourth preset number may be an integer greater than or equal to 1.

[0202] In the embodiment of the present application, when a thermal anomaly occurs in the first sub-battery device and the number of second sub-battery devices whose voltage information and / or temperature information of the battery cell is within the third preset range is greater than or equal to the fourth preset number, it is determined that the thermal anomaly of the first sub-battery device has seriously spread to the second sub-battery device. That is, it is possible to timely and accurately determine whether the thermal anomaly of the first sub-battery device has seriously spread to the second sub-battery device based on the voltage information and / or temperature information of the battery cells of the first sub-battery device and the second sub-battery device, so that operations such as fire fighting can be carried out on the first sub-battery device and the second sub-battery device in a targeted manner, thereby reducing the impact of the thermal anomaly of the battery device on its performance and life.

[0203] 820d, when the voltage information and / or temperature information of the battery cells in the first battery device are within the first target range, determine the number of second battery devices whose voltage information and / or temperature information of the battery cells are within the first preset range.

[0204] 830d, when the number of second battery devices whose voltage information and / or temperature information of the battery cells are within the first preset range is greater than or equal to the first preset number, it is determined that a second-level mild thermal anomaly occurs in the battery device.

[0205] 820e, when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determine the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second preset range.

[0206] 830e, when the number of second battery devices whose voltage information and / or temperature information of the battery cells are within the second preset range is greater than or equal to the second preset number, it is determined that a second-level severe thermal anomaly occurs in the battery device.

[0207] The contents of steps 820d, 830d, 820e and 830e can refer to the relevant descriptions of steps 520b, 530b, 520c and 530c, and this application will not repeat them here.

[0208] In some embodiments, the first sub-cell device and the second sub-cell device are adjacent.

[0209] For example, Fig. 9 (a) or Fig. 9 As shown in (b), when a first sub-battery device such as an electric box has a thermal anomaly, its heat will spread to its adjacent second sub-battery device (adjacent electric box).

[0210] In the embodiment of the present application, since the heat of the first sub-battery device will preferentially diffuse to other adjacent sub-battery devices when the first sub-battery device is in a level one thermal anomaly, if the first sub-battery device is adjacent to the second sub-battery device, it is possible to more accurately determine whether the thermal anomaly of the first sub-battery device has spread to the second sub-battery device, thereby reducing misjudgment of the thermal anomaly level.

[0211] In some embodiments, when a thermal abnormality occurs in the first sub-battery device, step 830a may continue to be performed.

[0212] 830a, sending the information of thermal anomaly of the first sub-battery device to the fire protection system of the battery device.

[0213] In some embodiments, the information about the thermal anomaly of the first sub-battery device includes a serial number of the first sub-battery device.

[0214] In some embodiments, when the thermal anomaly of the first sub-battery device slightly spreads to the second sub-battery device, the process may continue to step 840b.

[0215] 840b, sending information that the thermal anomaly of the first sub-battery device is slightly spreading to the fire protection system of the battery device.

[0216] The information that the thermal abnormality of the first sub-battery device has slightly spread is used to indicate that the thermal abnormality of the first sub-battery device has slightly spread to the second sub-battery device.

[0217] In some embodiments, the information that the thermal anomaly of the first sub-battery device is slightly spreading includes serial numbers of the first sub-battery device and the second sub-battery device.

[0218] In some embodiments, when the thermal anomaly of the first sub-battery device seriously spreads to the second sub-battery device, the process may continue to step 840c.

[0219] 840c, sending information that the thermal anomaly of the first sub-battery device is seriously spreading to the fire protection system of the battery device.

[0220] The information on the abnormally severe thermal spread of the first sub-battery device is used to indicate that the abnormally severe thermal spread of the first sub-battery device has occurred to the second sub-battery device.

[0221] In some embodiments, the information on the abnormally severe thermal spread of the first sub-battery device includes serial numbers of the first sub-battery device and the second sub-battery device.

[0222] In the event that a secondary mild thermal anomaly occurs in the battery device, step 840d may be continued.

[0223] 840d, sending a second-level mild thermal anomaly information to the fire protection system of the battery device.

[0224] The information of the second-level mild thermal anomaly is used to indicate that the thermal anomaly of the first battery device slightly spreads to the second battery device.

[0225] In some embodiments, the information of the second-level mild thermal anomaly includes serial numbers of the first battery device and the second battery device.

[0226] In some embodiments, when a secondary severe thermal abnormality occurs in the battery device, step 840e may continue to be executed.

[0227] 840e, sends a second-level severe thermal anomaly information to the fire protection system of the battery device.

[0228] The information of the second-level severe thermal anomaly is used to indicate that the thermal anomaly of the first battery device has severely spread to the second battery device.

[0229] In some embodiments, the information of the second-level severe thermal abnormality may include serial numbers of the first battery device and the second battery device.

[0230] In an embodiment of the present application, the thermal anomaly level information of the battery device can be sent to the fire protection system of the battery device. The battery device can perform targeted fire protection treatment on the battery device, such as alarm, cooling or fire extinguishing, according to the level of the thermal anomaly and the number of the battery device or sub-battery device.

[0231] In some embodiments, the voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes one or more of the following:

[0232] a) V min ≤V1 and lasts for Δt1;

[0233] b) T max ≥T1 and lasting Δt1;

[0234] c) T max -Tmin ≥ΔT1 and lasts for Δt1;

[0235] d) There is K in the battery cell m ≥K1 and lasts for Δt1;

[0236] e) T of battery cells 终 -T avg ≥ΔT2 and lasts for Δt1;

[0237] f) There is a battery cell that cannot collect voltage signals and lasts for Δt1.

[0238] Among them, V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0239] In some embodiments, for example, in step 520a and step 520b, the battery cell is a battery cell in a battery device. For example, the voltage information and / or temperature information of the battery cell in the first battery device is within the first preset range, and can be the minimum voltage V of the plurality of battery cells in the first battery device. min ≤V1 and lasts for Δt1, or the first battery device may have a battery cell K m ≥K1 and lasts for Δt1.

[0240] In some embodiments, for example, in steps 720b and 30b, the battery cell is a battery cell in a sub-battery device. For example, the second sub-battery device whose voltage information and / or temperature information of the battery cell is within the fourth preset range may be the minimum voltage V of multiple battery cells in a second sub-battery device. min ≤ V1 and lasts for Δt1, or it can also be K of a battery cell in a second sub-battery device m ≥K1 and lasts for Δt1.

[0241] In some embodiments, the battery cell may also be a battery cell of a sub-battery device in a battery device such as a first battery device. For example, the voltage information and / or temperature information of the battery cell in the first battery device may be within the first preset range, and the voltage information and / or temperature information of the battery cell of a sub-battery device in the first battery device may be within the first preset range.

[0242] For example, in a sub-battery device of the first battery device, the minimum voltage V min ≤V1 and lasts for Δt1; or in a sub-battery device of the first battery device, there is a battery cell with K m ≥K1 and lasts for Δt1.

[0243] In some embodiments, the voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes one or more of the following:

[0244] a) V min ≤V1 and T max ≥T1, duration Δt1;

[0245] b) V min ≤V1, K of battery cell exists m ≥K1 and T of battery cells exists 终 -T avg ≥ΔT2, lasting Δt1;

[0246] c) V min ≤V1,T max -T min ≥ΔT1 and T max ≥T1, duration Δt1;

[0247] d) T max ≥T1 and there is a battery cell K m ≥K1, duration Δt1;

[0248] e) T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell K m ≥K1, duration Δt1;

[0249] f) T max ≥T1 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1;

[0250] g) There is K in the battery cell m ≥K1, T of battery cells exists 终 -T avg ≥ΔT2 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1;

[0251] h), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell that cannot collect voltage signals for Δt1,

[0252] Among them, V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0253] As follows, V min ≤V1 and T max Taking ≥T1, and lasting Δt1 as an example, the meanings of a) to h) above are introduced. min ≤V1 and T max ≥T1, lasting for Δt1, which can be understood as the minimum voltage of the plurality of battery cells is less than or equal to the first preset voltage and the maximum temperature of the plurality of battery cells is greater than or equal to the first preset temperature, and lasts for Δt1 at the same time.

[0254] In an embodiment of the present application, one or more of the minimum voltage, maximum temperature, minimum temperature of multiple battery cells, the temperature rise rate of the battery cells, whether the voltage signal can be collected, the final temperature of the battery cells within Δt1, the average temperature within Δt1 and other information is used as the voltage information and / or temperature information of the battery cells, which can improve the accuracy of battery thermal anomaly detection.

[0255] It should be understood that in the embodiment of the present application, the thresholds corresponding to the first preset range and the fourth preset range may be the same or different. For example, V1 corresponding to the first preset range and V1 corresponding to the fourth preset range may be the same or different.

[0256] It should be understood that the embodiment of the present application does not limit the size of the preset threshold of the same type. For example, the first preset temperature difference may be greater than the second preset temperature difference, or the first preset temperature difference may be less than the second preset temperature, and the present application does not limit the relationship between the first preset temperature and the second preset temperature difference.

[0257] In some embodiments, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following:

[0258] a), N T≥T2 ≥N1 and lasts for Δt2;

[0259] b) N Kn≥K2≥N2 and lasts for Δt2;

[0260] c) N V≤V2 ≥N3 and lasts for Δt2 or N V failed ≥N3 and lasts for Δt2,

[0261] Among them, N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells greater than or equal to K2, K2 is the second preset temperature rise rate, N2 is the second preset number, N V≤V2 is the number of battery cells whose voltage V is less than or equal to V2, V2 is the second preset voltage, N V failed is the number of battery cells whose voltage signals cannot be collected, and N3 is a third preset number.

[0262] In some embodiments, for example, in step 720a, the battery cell is a battery cell in a sub-battery device. For example, the voltage information and / or temperature information of the battery cell in the first sub-battery device is within the third preset range, which may be the minimum voltage V of the plurality of battery cells in the first sub-battery device. min ≤ V1 and lasts for Δt1, or the first sub-battery device may have a battery cell K n ≥K1 and lasts for Δt1.

[0263] In some embodiments, for example, in steps 820e and 830e, the battery cell is a battery cell in a battery device. For example, a second battery device whose voltage information and / or temperature information of the battery cell is within a second preset range may be a second battery device in which the number of battery cells with T≥T2 is greater than or equal to N1 and lasts for Δt2.

[0264] In some embodiments, in some embodiments, the battery cell may also be a battery cell of a sub-battery device in a battery device such as a second battery device. For example, the second battery device whose voltage information and / or temperature information of the battery cell is within the second preset range may be a battery cell of a sub-battery device of the second battery device, wherein the number of battery cells with T≥T2 is greater than or equal to N1 and lasts for Δt2.

[0265] In some embodiments, the voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes: T≥T2 ≥N1 and N Kn≥K2 ≥N2, lasting Δt2.

[0266] Among them, NT≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells is greater than or equal to K2, K2 is the second preset temperature rise rate, and N2 is the second preset number.

[0267] In an embodiment of the present application, one or more of the temperature, temperature rise rate, voltage of a battery cell in a sub-battery device or a battery device, or whether a voltage signal is collected can be used as voltage information and / or temperature information of the battery cell, which can improve the accuracy of thermal anomaly detection of the battery device.

[0268] It should be understood that in the embodiment of the present application, the thresholds corresponding to the second preset range and the third preset range may be the same or different. For example, N1 corresponding to the second preset range and N1 corresponding to the third preset range may be the same or different.

[0269] It should be understood that the embodiment of the present application does not limit the size of the preset threshold of the same type. For example, the first preset number may be greater than the second preset number, or the first preset number may be less than the second preset number, or the first preset number may also be less than the second preset number.

[0270] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0271] The above describes in detail the method for detecting thermal anomalies of a battery device according to an embodiment of the present application. Fig.10 and Fig.11 The device for detecting thermal anomalies of a battery device according to an embodiment of the present application is described in detail. The technical features described in the method embodiment are applicable to the following device embodiments.

[0272] Fig.10 is a schematic block diagram of a device for detecting thermal anomalies of a battery device provided in an embodiment of the present application. Fig.10 It is shown that the detection device 4000 includes some or all of the following contents.

[0273] The battery device includes one or more battery cells, and the detection device 4000 includes an acquisition unit 4010 and a processing unit 4020 .

[0274] The acquisition unit 4010 is used to acquire the status parameter information of the battery cells in the multiple battery devices; the processing unit 4020 is used to determine the thermal anomaly level of the battery device according to the status parameter information, the thermal anomaly level includes a first-level thermal anomaly and a second-level thermal anomaly, the first-level thermal anomaly is used to indicate the thermal anomaly of the first battery device, the thermal anomaly of the first battery device includes the thermal anomaly of the first sub-battery device and the thermal anomaly of the first sub-battery device spreads to the second sub-battery device, and the second-level thermal anomaly is used to indicate the thermal anomaly of the first battery device spreads to the second battery device, wherein the multiple battery devices include a first battery device and a second battery device, the first battery device includes a first sub-battery device and a second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

[0275] In some embodiments, the state parameter information includes voltage information and / or temperature information.

[0276] In some embodiments, the processing unit 4020 is configured to determine that a first-level thermal anomaly occurs in the battery device when voltage information and / or temperature information of a battery cell in the first battery device is within a first target range.

[0277] In some embodiments, the processing unit 4020 is used to determine the number of second battery devices whose voltage information and / or temperature information of the battery cells are within a second target range when the voltage information and / or temperature information of the battery cells in the first battery device is within a first target range; and determine that a secondary thermal anomaly has occurred in the battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range is greater than or equal to the first target number.

[0278] In some embodiments, the processing unit 4020 is used to determine the number of second battery devices whose voltage information and / or temperature information of the battery cells in the first battery device is within a first target range; and to determine that a secondary mild thermal anomaly occurs in the battery device when the voltage information and / or temperature information of the battery cells is within a first target range; the secondary mild thermal anomaly includes a secondary mild thermal anomaly.

[0279] In some embodiments, the processing unit 4020 is used to determine the number of second battery devices whose voltage information and / or temperature information of the battery cells are within a second preset range when the voltage information and / or temperature information of the battery cells in the first battery device is within a first target range; and to determine that a second-level severe thermal anomaly has occurred in the battery device when the number of second battery devices whose voltage information and / or temperature information of the battery cells is within the second preset range is greater than or equal to a second preset number, wherein the second-level thermal anomaly includes a second-level severe thermal anomaly.

[0280] In some embodiments, the first battery device is adjacent to the second battery device.

[0281] In some embodiments, the processing unit 4020 is used to determine that a thermal abnormality occurs in the first sub-battery device when voltage information and / or temperature information of a battery cell in the first sub-battery device is within a third preset range, and the plurality of sub-battery devices include the first sub-battery device.

[0282] In some embodiments, the processing unit 4020 is used to determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within a third preset range or a fourth preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and to determine that the thermal anomaly of the first sub-battery device has spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range or the fourth preset range is greater than or equal to a second target number.

[0283] In some embodiments, the processing unit 4020 is used to determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within a fourth preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range; and to determine that the thermal anomaly of the first sub-battery device has slightly spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the fourth preset range is greater than or equal to the third preset number.

[0284] In some embodiments, the processing unit 4020 is used to: determine the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the third preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range; and determine that the thermal anomaly of the first sub-battery device has severely spread to the second sub-battery device when the number of second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range is greater than or equal to a fourth preset number.

[0285] In some embodiments, the first sub-cell device and the second sub-cell device are adjacent.

[0286] In some embodiments, the voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes one or more of the following: a), N T≥T2 ≥N1 and lasts for Δt2; b), N Kn≥K2 ≥N2 and lasts for Δt2; c), N V≤V2 ≥N3 and lasts for Δt2 or NV failed ≥ N3 and lasts for Δt2, where N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells greater than or equal to K2, K2 is the second preset temperature rise rate, N2 is the second preset number, N V≤V2 is the number of battery cells whose voltage V is less than or equal to V2, V2 is the second preset voltage, N V failed is the number of battery cells whose voltage signals cannot be collected, and N3 is a third preset number.

[0287] In some embodiments, the voltage information and / or temperature information of the battery cell within the first preset range or the fourth preset range includes: T≥T2 ≥N1 and N Kn≥K2 ≥N2, lasting Δt2, where N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells is greater than or equal to K2, K2 is the second preset temperature rise rate, and N2 is the second preset number.

[0288] In some embodiments, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a), V min ≤V1 and lasts for Δt1; b), T max ≥T1 and lasts for Δt1; c), T max -T min ≥ΔT1 and lasts for Δt1; d) There is a battery cell K m ≥K1 and lasts for Δt1; e) T of the battery cell exists 终 -T avg ≥ΔT2 and lasts for Δt1; f), there is a battery cell that cannot collect voltage signals and lasts for Δt1, where V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avgis the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0289] In some embodiments, the voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a), V min ≤V1 and T max ≥T1, lasting Δt1; b), V min ≤V1, K of battery cell exists m ≥K1 and T of battery cells exists 终 -T avg ≥ΔT2, lasting Δt1; c), V min ≤V1,T max -T min ≥ΔT1 and T max ≥T1, lasting Δt1; d), T max ≥T1 and there is a battery cell K m ≥K1, lasting Δt1; e), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell K m ≥K1, lasting Δt1; f), T max ≥T1 and there is a battery cell that cannot collect voltage signals for Δt1; g) There is a battery cell K m ≥K1, T of battery cells exists 终 -T avg ≥ΔT2 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1; h), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell that cannot collect voltage signals for Δt1, where V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of multiple battery cells, T1 is the first preset temperature, T min is the minimum temperature of multiple battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

[0290] It should be understood that the above and other operations and / or functions of each module in the battery system detection device 4000 are to achieve Figures 3 to 9For the sake of brevity, the corresponding processes in each method are not repeated here.

[0291] Fig.11 FIG. 5 is a schematic block diagram of a battery system detection device 5000 according to an embodiment of the present application. Fig.11 As shown, the detection device 5000 includes a processor 5010 and a memory 5020, wherein the memory 5020 is used to store instructions, and the processor 5010 is used to read the instructions and execute the methods of the various embodiments of the present application based on the instructions.

[0292] The memory 5020 may be a separate device independent of the processor 5010 , or may be integrated into the processor 5010 .

[0293] Alternatively, if Fig.11 As shown, the battery system detection device 5000 may further include a transceiver 5030, and the processor 5010 may control the transceiver 5030 to communicate with other devices. Specifically, information or data may be sent to other devices, or information or data sent by other devices may be received.

[0294] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor may be a general processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined to perform. The software module may be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0295] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0296] Optionally, an embodiment of the present application further provides an energy storage device, which includes a battery device and the detection device provided in the embodiment of the present application.

[0297] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0298] Optionally, the computer-readable storage medium can be applied to the detection device of the battery system in the embodiment of the present application, and when the computer program is run on the computer, the computer executes the corresponding processes implemented by the detection device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0299] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0300] Optionally, the computer program product can be applied to the detection device of the battery system in the embodiment of the present application, and when the computer program instructions are run on a computer, the computer executes the corresponding processes implemented by the detection device in the various methods of the embodiment of the present application. For the sake of brevity, they are not repeated here.

[0301] The embodiment of the present application also provides a computer program.

[0302] Optionally, the computer program can be applied to the detection device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the detection device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0303] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0304] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0305] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection involved in the embodiments of the present application can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0306] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0307] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0308] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0309] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting thermal anomaly of a battery device, characterized in that: The detection method comprises: Acquiring state parameter information of battery cells in a plurality of the battery devices; According to the state parameter information, a thermal anomaly level of the battery device is determined, the thermal anomaly level includes a first-level thermal anomaly and a second-level thermal anomaly, the first-level thermal anomaly is used to indicate a thermal anomaly of a first battery device, the thermal anomaly of the first battery device includes a thermal anomaly of a first sub-battery device and the thermal anomaly of the first sub-battery device spreads to a second sub-battery device, and the second-level thermal anomaly is used to indicate that the thermal anomaly of the first battery device spreads to a second battery device, wherein the plurality of battery devices include the first battery device and the second battery device, the first battery device includes the first sub-battery device and the second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

2. The detection method according to claim 1, characterized in that: The state parameter information includes voltage information and / or temperature information.

3. The detection method according to claim 1, characterized in that: The step of determining the thermal anomaly level of the battery device according to the state parameter information includes: When the voltage information and / or the temperature information of the battery cells in the first battery device are within the first target range, determining that the first-level thermal anomaly occurs in the battery device, Among them, the voltage information and / or temperature information of the battery cells in the first battery device within the first target range includes: the voltage information and / or temperature information of the battery cells in the first sub-battery device within the third preset range, or, the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range and there is a second sub-battery device whose voltage information and / or temperature information of the battery cells is within the third preset range or within the fourth preset range.

4. The detection method according to claim 3, characterized in that: The detection method further comprises: When the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determining the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range; When the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within the second target range is greater than or equal to the first target number, it is determined that the secondary thermal abnormality occurs in the battery device.

5. The detection method according to claim 3, characterized in that: The detection method further comprises: When the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determining the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within the first preset range; When the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within the first preset range is greater than or equal to the first preset number, it is determined that a secondary mild thermal anomaly occurs in the battery device, and the secondary thermal anomaly includes the secondary mild thermal anomaly.

6. The detection method according to claim 3, characterized in that: The detection method further comprises: When the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range, determining the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within a second preset range; When the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within the second preset range is greater than or equal to the second preset number, it is determined that a secondary severe thermal anomaly occurs in the battery device, and the secondary thermal anomaly includes the secondary severe thermal anomaly.

7. The detection method according to claim 1, characterized in that: The first battery device is adjacent to the second battery device.

8. The detection method according to claim 3, characterized in that: The determining that the first-level thermal anomaly occurs in the battery device includes: When the voltage information and / or the temperature information of the battery cells in the first sub-battery device is within the third preset range, it is determined that a thermal abnormality occurs in the first sub-battery device.

9. The detection method according to claim 3, characterized in that: The determining that the first-level thermal anomaly occurs in the battery device includes: When the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range, determining the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range or the fourth preset range; When the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the third preset range or the fourth preset range is greater than or equal to the second target number, it is determined that the thermal abnormality of the first sub-battery device spreads to the second sub-battery device.

10. The detection method according to claim 3, characterized in that: The determining that the first-level thermal anomaly occurs in the battery device includes: When the voltage information and / or temperature information of the battery cells in the first sub-battery device is within a third preset range, determining the number of the second sub-battery devices having the voltage information and / or temperature information of the battery cells within a fourth preset range; When the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the fourth preset range is greater than or equal to the third preset number, it is determined that the thermal anomaly of the first sub-battery device slightly spreads to the second sub-battery device.

11. The detection method according to claim 3, characterized in that: The determining that the first-level thermal anomaly occurs in the battery device includes: When the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range, determining the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells is within the third preset range; When the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the third preset range is greater than or equal to a fourth preset number, it is determined that the thermal anomaly of the first sub-battery device has severely spread to the second sub-battery device.

12. The detection method according to claim 9, characterized in that: The first sub-cell device and the second sub-cell device are adjacent to each other.

13. The detection method according to any one of claims 5, 9 and 10, characterized in that: The voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes one or more of the following: a), N T≥T2 ≥N1 and lasts for Δt2; b) N Kn≥K2 ≥N2 and lasts for Δt2; c) N V≤V2 ≥N3 and lasts for Δt2 or N V failed ≥N3 and lasts for Δt2, Among them, N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells greater than or equal to K2, K2 is the second preset temperature rise rate, N2 is the second preset number, N V≤V2 is the number of battery cells whose voltage V is less than or equal to V2, V2 is the second preset voltage, N V failed is the number of battery cells whose voltage signals cannot be collected, and N3 is a third preset number.

14. The detection method according to any one of claims 5, 9 and 10, characterized in that: The voltage information and / or temperature information of the battery cell within the first preset range or the voltage information and / or temperature information of the battery cell within the fourth preset range includes: N T≥T2 ≥N1 and N Kn≥K2 ≥N2, duration Δt2, Among them, N T≥T2 is the number of battery cells with a temperature T greater than or equal to T2, T2 is the second preset temperature, N1 is the first preset number, Δt2 is the second preset time, N Kn≥K2 is the temperature rise rate K n The number of battery cells is greater than or equal to K2, K2 is the second preset temperature rise rate, and N2 is the second preset number.

15. The detection method according to any one of claims 6, 8 to 11, characterized in that: The voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a) V min ≤V1 and lasts for Δt1; b) T max ≥T1 and lasting Δt1; c) T max -T min ≥ΔT1 and lasts for Δt1; d) There is K in the battery cell m ≥K1 and lasts for Δt1; e) T of battery cells 终 -T avg ≥ΔT2 and lasts for Δt1; f) There is a battery cell that cannot collect voltage signals and lasts for Δt1. Among them, V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of the plurality of battery cells, T1 is the first preset temperature, T min is the minimum temperature of the plurality of battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

16. The detection method according to any one of claims 6, 8 to 11, characterized in that: The voltage information and / or temperature information of the battery cell within the second preset range or the voltage information and / or temperature information of the battery cell within the third preset range includes one or more of the following: a) V min ≤V1 and T max ≥T1, duration Δt1; b) V min ≤V1, K of battery cell exists m ≥K1 and T of battery cells exists 终 -T avg ≥ΔT2, lasting Δt1; c) V min ≤V1,T max -T min ≥ΔT1 and T max ≥T1, duration Δt1; d) T max ≥T1 and there is K of battery cells m ≥K1, duration Δt1; e) T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell K m ≥K1, duration Δt1; f) T max ≥T1 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1; g) There is K in the battery cell m ≥K1, T of battery cells exists 终 -T avg ≥ΔT2 and there is a battery cell that cannot collect voltage signals, which lasts for Δt1; h), T max ≥T1, T max -T min ≥ΔT1 and there is a battery cell that cannot collect voltage signals for Δt1, Among them, V min is the minimum voltage of multiple battery cells, V1 is the first preset voltage, Δt1 is the first preset time, T max is the highest temperature of the plurality of battery cells, T1 is the first preset temperature, T min is the minimum temperature of the plurality of battery cells, ΔT1 is the first preset temperature difference, K m is the temperature rise rate, K1 is the first preset temperature rise rate, T 终 is the final temperature within Δt1, T avg is the average temperature within Δt1, and ΔT2 is the second preset temperature difference.

17. A battery device thermal anomaly detection device, characterized in that: The detection device comprises: An acquisition unit, used to acquire state parameter information of battery cells in a plurality of the battery devices; A processing unit is used to determine the thermal anomaly level of the battery device according to the state parameter information, the thermal anomaly level includes a first-level thermal anomaly and a second-level thermal anomaly, the first-level thermal anomaly is used to indicate a thermal anomaly of a first battery device, the thermal anomaly of the first battery device includes a thermal anomaly of a first sub-battery device and the thermal anomaly of the first sub-battery device spreads to a second sub-battery device, and the second-level thermal anomaly is used to indicate that the thermal anomaly of the first battery device spreads to a second battery device, wherein the plurality of battery devices include the first battery device and the second battery device, the first battery device includes the first sub-battery device and the second sub-battery device, and the first sub-battery device and the second sub-battery device each include at least one battery cell.

18. The detection device according to claim 17, characterized in that: The state parameter information includes voltage information and / or temperature information.

19. The detection device according to claim 17, characterized in that: The processing unit is configured to determine that the first-level thermal anomaly occurs in the battery device when the voltage information and / or the temperature information of the battery cell in the first battery device is within a first target range, Among them, the voltage information and / or temperature information of the battery cells in the first battery device within the first target range includes: the voltage information and / or temperature information of the battery cells in the first sub-battery device within a third preset range, or, the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range and there is a second sub-battery device whose voltage information and / or temperature information of the battery cells is within the third preset range or within the fourth preset range.

20. The detection device according to claim 19, characterized in that: The processing unit is configured to determine the number of the second battery devices having the voltage information and / or temperature information of the battery cells within the first target range when the voltage information and / or temperature information of the battery cells in the first battery device is within the first target range; When the number of the second battery devices whose voltage information and / or temperature information of the battery cells is within the first target range is greater than or equal to the first target number, it is determined that the secondary thermal abnormality occurs in the battery device.

21. The detection device according to claim 19, characterized in that: The processing unit is configured to determine that a thermal anomaly occurs in the first sub-battery device when the voltage information and / or the temperature information of the battery cells in the first sub-battery device is within the third preset range.

22. The detection device according to claim 19, characterized in that: The processing unit is used to determine the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range or the fourth preset range when the voltage information and / or temperature information of the battery cells in the first sub-battery device is within the third preset range; When the number of the second sub-battery devices whose voltage information and / or temperature information of the battery cells are within the third preset range or the fourth preset range is greater than or equal to the second target number, it is determined that the thermal abnormality of the first sub-battery device spreads to the second sub-battery device.

23. A battery device thermal anomaly detection device, characterized in that: The detection device comprises a memory and a processor, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute the detection method according to any one of claims 1 to 16 according to the instructions.

24. An energy storage device, characterized in that: The energy storage device comprises a plurality of battery devices and a detection device as claimed in any one of claims 17 to 23.

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