Battery pack thermal runaway early warning method, device and system, battery pack and equipment

Abstract

The invention relates to a battery pack thermal runaway early warning method, device and system, a battery pack and equipment, and the method comprises the steps: determining a battery pack thermal runaway detection parameter; wherein the battery pack thermal runaway detection parameters comprise at least two kinds of abnormal sampling information of an explosion-proof valve temperature parameter, a battery cell module temperature parameter, a single battery cell voltage parameter and a battery cell parameter; determining a battery pack thermal runaway early warning grade according to the battery pack thermal runaway detection parameters; and sending out corresponding warning information according to the battery pack thermal runaway early warning level.

Description

Technical Field

[0001] The present disclosure relates to electric vehicle technology, and more specifically, to a battery pack thermal runaway warning method, device, system, battery pack and equipment. Background Art

[0002] As the power source of new energy vehicles, lithium-ion batteries have broad prospects for use with the promotion of new energy vehicles. However, the use of lithium batteries also has great safety risks, especially ternary lithium batteries. When the battery has thermal runaway, it will generate huge heat, instantly burn the vehicle, and cause losses to personal safety and property.

[0003] Therefore, how to accurately issue an alarm before the lithium battery thermal runaway is an issue that needs to be solved urgently. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for a battery pack thermal runaway early warning method.

[0005] According to a first aspect of the present invention, a method for early warning of thermal runaway of a battery pack is provided, comprising:

[0006] Determine the battery pack thermal runaway detection parameters; wherein the battery pack thermal runaway detection parameters include at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, and abnormal sampling information of the battery cell parameters;

[0007] Determining a battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters;

[0008] According to the thermal runaway warning level of the battery pack, a corresponding warning message is issued.

[0009] Optionally, when the battery pack thermal runaway detection parameters include temperature parameters at the explosion-proof valve, temperature parameters of the battery cell module, voltage parameters of the single battery cell, and abnormal sampling information of battery cell parameters, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters includes:

[0010] The thermal runaway warning level of the battery pack is determined according to the temperature parameter at the explosion-proof valve, the temperature parameter of the battery module, the voltage parameter of the single battery cell and the abnormal sampling information of the battery cell parameter.

[0011] Optionally, determining the thermal runaway warning level of the battery pack according to the temperature parameter at the explosion-proof valve, the temperature parameter of the battery module, the voltage parameter of the single battery cell, and the abnormal sampling information of the battery cell parameter includes:

[0012] Determine a first thermal runaway warning level according to the temperature parameter at the explosion-proof valve, determine a second thermal runaway warning level according to the temperature parameter of the battery module, determine a third thermal runaway warning level according to the single battery cell voltage parameter, and determine a fourth thermal runaway warning level according to abnormal sampling information of the battery cell parameter;

[0013] The thermal runaway warning level of the battery pack is determined according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level and the fourth thermal runaway warning level.

[0014] Optionally, a temperature sensor is installed at the explosion-proof valve on the battery pack, and the temperature sensor is used to collect the temperature at the explosion-proof valve.

[0015] Optionally, the temperature parameter at the explosion-proof valve includes a temperature rise rate at the explosion-proof valve and a maximum temperature value at the explosion-proof valve; wherein, when the battery pack thermal runaway detection parameter includes a temperature parameter at the explosion-proof valve, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes:

[0016] Determining a first level of the first thermal runaway warning level according to a temperature rise rate at the explosion-proof valve, and determining a second level of the first thermal runaway warning level according to a maximum temperature value at the explosion-proof valve;

[0017] The highest level of the first level of the first thermal runaway warning level and the second level of the first thermal runaway warning level is determined as the first thermal runaway warning level.

[0018] Optionally, determining the first level of the first thermal runaway warning level according to the temperature rise rate at the explosion-proof valve includes:

[0019] When the temperature rise rate at the explosion-proof valve exceeds a first preset temperature rise rate threshold, obtaining the duration of the temperature rise rate at the explosion-proof valve;

[0020] determining a first level of the first thermal runaway warning level according to the duration of the temperature rise rate at the explosion-proof valve; and

[0021] Determining the second level of the first thermal runaway warning level according to the maximum temperature value at the explosion-proof valve includes:

[0022] When the maximum temperature value at the explosion-proof valve exceeds a first preset temperature threshold, obtaining a duration of the maximum temperature value at the explosion-proof valve;

[0023] A second level of the first thermal runaway warning level is determined according to the duration of the highest temperature value at the explosion-proof valve.

[0024] Optionally, the battery cell module temperature parameters include the temperature rise rate in each battery cell module, the maximum temperature value in each battery cell module and the number of upgrades of the temperature outlier risk level of each battery cell module; wherein, when the battery pack thermal runaway detection parameters include the battery cell module temperature parameters, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters includes:

[0025] Determining a first level of the second thermal runaway warning level according to the temperature rise rate in each battery module, determining a second level of the second thermal runaway warning level according to the maximum temperature value in each battery module, and determining a third level of the second thermal runaway warning level according to the number of upgrades of the temperature outlier risk level of each battery module;

[0026] A highest level among the first level of the second thermal runaway warning level, the second level of the second thermal runaway warning level, and the third level of the second thermal runaway warning level is determined as the second thermal runaway warning level.

[0027] Optionally, determining the first level of the second thermal runaway warning level according to the temperature rise rate in each battery cell module includes:

[0028] When the temperature rise rate in at least one battery cell module exceeds a second preset temperature rise rate threshold, obtaining the duration of the temperature rise rate in the at least one battery cell module;

[0029] Determining a first level of the second thermal runaway warning level according to a duration of a temperature rise rate in the at least one battery cell module;

[0030] The determining the second level of the second thermal runaway warning level according to the maximum temperature value in each battery cell module includes:

[0031] When the maximum temperature value in the at least one battery cell module exceeds a second preset temperature threshold, obtaining a duration of the maximum temperature value in the at least one battery cell module;

[0032] A second level of the second thermal runaway warning level is determined according to the duration of the highest temperature value in the at least one battery cell module.

[0033] Optionally, before determining the third level of the second thermal runaway warning level according to the number of upgrades of the temperature outlier risk level of each battery cell module, the method further includes:

[0034] Obtain the temperature of each battery cell module and the preset temperature difference threshold within a sampling period;

[0035] According to the temperature inside each battery cell module at each sampling moment, determine the average temperature value inside all battery cell modules at each sampling moment;

[0036] Determine the temperature outlier risk level of each battery module at each sampling moment according to the temperature in each battery module at each sampling moment, the average temperature value of the temperature in all battery modules at each sampling moment, and the preset temperature difference threshold;

[0037] According to the temperature outlier risk level of each battery module at each sampling moment, the number of upgrades of the temperature outlier risk level of each battery module is determined.

[0038] Optionally, the single cell voltage parameter includes the number of upgrades of the voltage outlier risk level of each single cell; wherein, when the battery pack thermal runaway detection parameter includes the single cell voltage parameter, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes:

[0039] The fourth thermal runaway warning level is determined according to the number of times the voltage outlier risk level of each single battery cell is upgraded.

[0040] Optionally, before determining the fourth thermal runaway warning level according to the number of upgrades of the voltage outlier risk level of each single battery cell, the method further includes:

[0041] Obtain the voltage value of each single cell and the preset voltage difference threshold within a sampling period;

[0042] According to the voltage value of each single cell at each sampling moment, determine the average voltage value of all the single cell voltage values ​​at each sampling moment;

[0043] Determine the voltage outlier risk level of each single cell at each sampling moment according to the voltage value of each single cell at each sampling moment, the average voltage value of all the voltage values ​​of the single cells at each sampling moment, and the preset voltage difference threshold;

[0044] According to the voltage outlier risk level of each single cell at each sampling moment, the number of times the voltage outlier risk level of each single cell is upgraded is determined.

[0045] Optionally, the abnormal sampling information of the battery cell parameters includes the number of battery cell modules with disconnected temperature sampling, the number of single battery cells with disconnected voltage sampling, and the number of battery cell modules with a temperature drop rate exceeding a preset drop rate threshold; wherein, in the case where the battery pack thermal runaway detection parameter includes the abnormal sampling information of the battery cell parameters, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes:

[0046] Determining the first level of the fourth thermal runaway warning level according to the number of battery cell modules where the temperature sampling is disconnected;

[0047] Determining the second level of the fourth thermal runaway warning level according to the number of single cells where the voltage sampling is disconnected;

[0048] Determining the third level of the fourth thermal runaway warning level according to the number of battery cell modules whose temperature drop rate exceeds a preset drop rate threshold;

[0049] The highest level among the first level of the fourth thermal runaway warning level, the second level of the fourth thermal runaway warning level and the third level of the fourth thermal runaway warning level is determined as the fourth thermal runaway warning level.

[0050] Optionally, the number of battery cell modules where the temperature sampling is disconnected is at least one of the number of discontinuous battery cell modules where the temperature sampling is disconnected and the number of continuous battery cell modules where the temperature sampling is disconnected.

[0051] The number of single cells where voltage sampling is disconnected includes at least one of the number of non-continuous single cells where voltage sampling is disconnected and the number of continuous single cells where voltage sampling is disconnected.

[0052] Optionally, determining the thermal runaway warning level of the battery pack according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, and the fourth thermal runaway warning level includes:

[0053] Obtaining weight values ​​corresponding to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, and the fourth thermal runaway warning level;

[0054] The thermal runaway warning level of the battery pack is determined according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, the fourth thermal runaway warning level and corresponding weight values.

[0055] According to a second aspect of the present invention, a battery pack thermal runaway warning device is provided, comprising:

[0056] A thermal runaway detection parameter determination module, used to determine the thermal runaway detection parameters of the battery pack; wherein the thermal runaway detection parameters of the battery pack include at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, the abnormal parameters of the battery cell, and the invalid sampling information of the battery cell parameters;

[0057] A thermal runaway warning level determination module, used to determine the thermal runaway warning level of the battery pack according to the thermal runaway detection parameters of the battery pack;

[0058] The warning information issuing module is used to issue corresponding warning information according to the thermal runaway warning level of the battery pack.

[0059] According to a third aspect of the present invention, a battery pack thermal runaway warning device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is used to control the processor to operate to execute the battery pack thermal runaway warning method according to any one of the first aspect of the present invention.

[0060] According to a fourth aspect of the present invention, a battery management system is provided, comprising the battery pack thermal runaway warning device provided in the second aspect or the third aspect.

[0061] According to a fifth aspect of the present invention, a battery pack is provided, comprising the battery management system provided by the fourth aspect.

[0062] According to a sixth aspect of the present invention, there is provided an electrical device comprising the battery pack provided in the fifth aspect.

[0063] The battery pack thermal runaway warning method provided by the present invention obtains at least two parameters of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell and the abnormal sampling information of the battery cell parameters, determines the thermal runaway warning level of the battery pack according to at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell and the abnormal sampling information of the battery cell parameters, and issues corresponding warning information according to the thermal runaway warning level of the battery pack. It can determine the thermal runaway warning level of the battery pack from multiple dimensions, and issue corresponding warning information based on different thermal runaway warning levels of the battery pack, which is more detailed, improves accuracy and reduces the risk of false alarms.

[0064] Features and advantages of the embodiments of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the embodiments of the specification.

[0066] Figure 1 It is a processing flow chart of a battery pack thermal runaway warning method according to an embodiment of the present invention.

[0067] Figure 2 is a process flow chart of determining a first thermal runaway warning level according to an embodiment of the present invention.

[0068] Figure 3 is a flowchart of a process for determining a second thermal runaway warning level according to an embodiment of the present invention.

[0069] Figure 4 is a flowchart of a process for determining a third thermal runaway warning level according to an embodiment of the present invention.

[0070] Figure 5 is a flowchart of a process for determining a fourth thermal runaway warning level according to an embodiment of the present invention.

[0071] Figure 6 It is a principle block diagram of a battery pack thermal runaway warning device according to an embodiment of the present invention.

[0072] Figure 7 Schematic diagram of the hardware structure of a battery pack thermal runaway warning device according to an embodiment of the present invention.

[0073] Figure 8 is a principle block diagram of a battery pack management system according to an embodiment of the present invention.

[0074] Fig. 9 is a principle block diagram of a battery pack according to an embodiment of the present invention.

[0075] Fig.10 It is a principle block diagram of an electric device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0076] Various exemplary embodiments of the present specification will now be described in detail with reference to the accompanying drawings.

[0077] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the embodiments of the present specification and its application or uses.

[0078] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0079] <Method Example>

[0080] In one embodiment of the present invention, a battery pack thermal runaway warning method is provided. Figure 1 As shown, the battery pack thermal runaway warning method of this embodiment may include the following steps S110 to S130.

[0081] Step S110, determining battery pack thermal runaway detection parameters; wherein the battery pack thermal runaway detection parameters include at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, and abnormal sampling information of the battery cell parameters.

[0082] In one embodiment, a temperature sensor is installed at the explosion-proof valve on the battery pack. The temperature sensor is used to collect the temperature at the explosion-proof valve. The temperature sensor may be an NTC (Negative Temperature Coefficient Sensor) temperature sensor. The temperature value at the explosion-proof valve measured by the temperature sensor is directly collected by the BMU (Battery Management Unit), which reduces the cost overall.

[0083] The battery pack involved in this embodiment is composed of multiple battery cells. The multiple battery cells are divided into multiple battery cell modules. Based on each battery cell module, one or more temperature sensors are used to measure its temperature. The AFE (Analog Front End) collects the voltage value of each single battery cell and the temperature value of each battery cell module measured by each temperature sensor.

[0084] Step S120, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters.

[0085] In one embodiment, when the thermal runaway detection parameters of the battery pack are the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, and the abnormal sampling information of the battery cell parameters, step S120 specifically includes: determining the first thermal runaway warning level according to the temperature parameters at the explosion-proof valve, determining the second thermal runaway warning level according to the temperature parameters of the battery cell module, determining the third thermal runaway warning level according to the voltage parameters of the single battery cell, and determining the fourth thermal runaway warning level according to the abnormal sampling information of the battery cell parameters, and then determining the thermal runaway warning level of the battery pack according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, and the fourth thermal runaway warning level. In this embodiment, the thermal runaway warning level of the battery pack is determined from four dimensions: the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, and the abnormal sampling information of the battery cell parameters, which improves the accuracy and reduces the risk of false alarms.

[0086] In one embodiment, the temperature parameter at the explosion-proof valve includes a temperature rise rate at the explosion-proof valve and a maximum temperature value at the explosion-proof valve. According to the temperature rise rate at the explosion-proof valve, a first level of the first thermal runaway warning level is determined, and according to the maximum temperature value at the explosion-proof valve, a second level of the first thermal runaway warning level is determined. The highest level of the first level of the first thermal runaway warning level and the second level of the first thermal runaway warning level is determined as the first thermal runaway warning level.

[0087] The temperature rise rate at the explosion-proof valve is calculated based on the temperature value measured by the temperature sensor at the explosion-proof valve. Specifically, the temperature value measured by the temperature sensor within a sampling period is obtained, and the temperature rise rate at the explosion-proof valve is calculated based on the temperature value measured by the temperature sensor within the sampling period. For example, the temperature rise rate at the explosion-proof valve is calculated based on the lowest temperature value within the sampling period, the highest temperature value within the sampling period, and the sampling time interval between the lowest temperature value and the highest temperature value. It should be noted that, in this calculation method, the condition that needs to be met is that the sampling time of the highest temperature value is later than the sampling time of the lowest temperature value. For another example, the temperature rise rate at the explosion-proof valve is calculated based on the first sampled temperature value within the sampling period, the last sampled temperature value and the duration of the sampling period.

[0088] The maximum temperature value at the explosion-proof valve is calculated based on the temperature value measured by the temperature sensor at the explosion-proof valve. Specifically, the temperature value measured by the temperature sensor within a sampling period is obtained, and the maximum temperature value within the sampling period is determined as the maximum temperature value at the explosion-proof valve.

[0089] The duration of the sampling period is a pre-calibrated value, for example, 1s, 3s.

[0090] It should be noted that before determining the temperature rise rate at the explosion-proof valve and the maximum temperature value at the explosion-proof valve according to the temperature value measured by the temperature sensor at the explosion-proof valve, it is determined whether the temperature value measured by the temperature sensor at the explosion-proof valve is valid. If the temperature value measured by the temperature sensor at the explosion-proof valve is valid, the temperature rise rate at the explosion-proof valve and the maximum temperature value at the explosion-proof valve are determined.

[0091] In one example, when the temperature rise rate at the explosion-proof valve exceeds a first preset temperature rise rate threshold, the duration of the temperature rise rate at the explosion-proof valve is obtained. Then, the first level of the first thermal runaway warning level is determined according to the duration of the temperature rise rate at the explosion-proof valve.

[0092] Specifically, when the temperature rise rate at the explosion-proof valve does not exceed the first preset temperature rise rate threshold, the first level of the first thermal runaway warning level is determined to be 0. When the temperature rise rate at the explosion-proof valve exceeds the first preset temperature rise rate threshold, the duration of the temperature rise rate at the explosion-proof valve is obtained. When the duration of the temperature rise rate at the explosion-proof valve exceeds the first preset duration, the first level of the first thermal runaway warning level is determined to be 2. When the duration of the temperature rise rate at the explosion-proof valve does not exceed the first preset duration, and the duration of the temperature rise rate at the explosion-proof valve exceeds the second preset duration, the first level of the first thermal runaway warning level is determined to be 1. When the duration of the temperature rise rate at the explosion-proof valve does not exceed the second preset duration, the first level of the first thermal runaway warning level is determined to be 0. The first preset duration is greater than the second preset duration.

[0093] The first preset temperature rise rate threshold is a pre-calibrated value, for example, 5° / s. The first preset time length is a pre-calibrated value, for example, 2s. The second preset time length is a pre-calibrated value, for example, 1s.

[0094] In one example, when the maximum temperature value at the explosion-proof valve exceeds the first preset temperature threshold, the duration of the maximum temperature value at the explosion-proof valve is obtained, and then the second level of the first thermal runaway warning level is determined according to the duration of the maximum temperature value at the explosion-proof valve.

[0095] Specifically, when the maximum temperature value at the explosion-proof valve does not exceed the first preset temperature threshold, the second level of the first thermal runaway warning level is determined to be 0. When the maximum temperature value at the explosion-proof valve exceeds the first preset temperature threshold, the duration of the maximum temperature value at the explosion-proof valve is obtained. When the duration of the maximum temperature value at the explosion-proof valve exceeds the third preset duration, the second level of the first thermal runaway warning level is determined to be 2. When the duration of the maximum temperature value at the explosion-proof valve does not exceed the third preset duration, and the duration of the maximum temperature value at the explosion-proof valve exceeds the fourth preset duration, the second level of the first thermal runaway warning level is determined to be 1. When the duration of the maximum temperature value at the explosion-proof valve does not exceed the fourth preset duration, the second level of the first thermal runaway warning level is determined to be 0. The third preset duration is greater than the fourth preset duration.

[0096] The first preset temperature threshold is a pre-calibrated value. The third preset time length is a pre-calibrated value, for example, 2 seconds. The fourth preset time length is a pre-calibrated value, for example, 1 second.

[0097] Figure 2 FIG. 1 is a flowchart of a process for determining a first thermal runaway warning level according to an embodiment of the present invention. Figure 2 , determining the first thermal runaway warning level includes steps S201 to S220.

[0098] Step S201, obtaining a temperature value measured by a temperature sensor at the explosion-proof valve.

[0099] Step S202, determining whether the temperature value measured by the temperature sensor at the explosion-proof valve is valid.

[0100] When the judgment result of step S202 is valid, step S203 is executed to determine the temperature rise rate at the explosion-proof valve and the maximum temperature value at the explosion-proof valve according to the temperature value measured by the temperature sensor at the explosion-proof valve.

[0101] Step S204, determining whether the temperature rise rate at the explosion-proof valve exceeds a first preset temperature rise rate threshold.

[0102] If the judgment result of step S204 is no, step S205 is executed, and the first level of the first thermal runaway warning level is determined to be 0.

[0103] If the judgment result of step S204 is yes, step S206 is executed to obtain the duration of the temperature rise rate at the explosion-proof valve.

[0104] Step S207, determining whether the duration of the temperature rise rate at the explosion-proof valve exceeds a first preset duration.

[0105] If the judgment result of step S207 is yes, step S208 is executed and the first level of the first thermal runaway warning level is determined to be 2.

[0106] If the judgment result of step S207 is no, step S209 is executed to judge whether the duration of the temperature rise rate at the explosion-proof valve exceeds a second preset time length. The first preset time length is greater than the second preset time length.

[0107] If the determination result of step S209 is yes, step S210 is executed and the first level of the first thermal runaway warning level is determined to be 1.

[0108] When the judgment result of step S209 is no, step S211 is executed, and the first level of the first thermal runaway warning level is determined to be 0.

[0109] Step S212, determining whether the maximum temperature value at the explosion-proof valve exceeds a first preset temperature threshold.

[0110] When the judgment result of step S212 is no, step S213 is executed and the second level of the first thermal runaway warning level is determined to be 0.

[0111] If the judgment result of step S212 is yes, step S214 is executed to obtain the duration of the highest temperature value at the explosion-proof valve.

[0112] Step S215, determining whether the duration of the highest temperature value at the explosion-proof valve exceeds a third preset duration.

[0113] If the judgment result of step S215 is yes, step S216 is executed and the first level of the first thermal runaway warning level is determined to be 2.

[0114] If the result of the determination in step S215 is negative, step S217 is executed to determine whether the duration of the highest temperature value at the explosion-proof valve exceeds a fourth preset duration. The third preset duration is greater than the fourth preset duration.

[0115] If the determination result of step S217 is yes, step S218 is executed and the second level of the first thermal runaway warning level is determined to be 1.

[0116] When the judgment result of step S217 is no, step S219 is executed and the second level of the first thermal runaway warning level is determined to be 0.

[0117] Step S220: determining the highest level of the first level of the first thermal runaway warning level and the second level of the first thermal runaway warning level as the first thermal runaway warning level.

[0118] The first thermal runaway warning level is determined by collecting the temperature parameters at the explosion-proof valve through the temperature sensor added at the explosion-proof valve, thereby realizing the determination of the thermal runaway warning level of the battery pack from the dimension of the temperature parameters at the explosion-proof valve. At the same time, the temperature sensor added at the explosion-proof valve is low in cost and will not increase the production cost excessively.

[0119] In one embodiment, the temperature parameters of the battery cell modules include the temperature rise rate in each battery cell module, the maximum temperature value in each battery cell module, and the number of upgrades of the temperature outlier risk level of each battery cell module. According to the temperature rise rate in each battery cell module, the first level of the second thermal runaway warning level is determined, according to the maximum temperature value in each battery cell module, the second level of the second thermal runaway warning level is determined, and according to the number of upgrades of the temperature outlier risk level of each battery cell module, the third level of the second thermal runaway warning level is determined. The highest level among the first level of the second thermal runaway warning level, the second level of the second thermal runaway warning level, and the third level of the second thermal runaway warning level is determined as the second thermal runaway warning level.

[0120] Based on each battery cell module, the temperature rise rate in the battery cell module is calculated based on the temperature value measured by the temperature sensor of the battery cell module. Specifically, the temperature value measured by the temperature sensor within a sampling period is obtained, and the temperature rise rate in the battery cell module is calculated based on the temperature value measured by the temperature sensor within the sampling period. For example, the temperature rise rate in the battery cell module is calculated based on the lowest temperature value within the sampling period, the highest temperature value within the sampling period, and the sampling time interval between the lowest temperature value and the highest temperature value. It should be noted that, using this calculation method, the condition that needs to be met is that the sampling time of the highest temperature value is later than the sampling time of the lowest temperature value. For another example, the temperature rise rate in the battery cell module is calculated based on the first sampled temperature value within the sampling period, the last sampled temperature value and the length of the sampling period.

[0121] Based on each battery cell module, the maximum temperature value in the battery cell module is calculated based on the temperature value measured by the temperature sensor of the battery cell module. Specifically, the temperature value measured by the temperature sensor in a sampling period is obtained, and the maximum temperature value in the sampling period is determined as the maximum temperature value in the battery cell module.

[0122] The duration of the sampling period is a pre-calibrated value, for example, 1s, 3s.

[0123] It should be noted that, based on each battery cell module, before determining the temperature rise rate of the battery cell module, the maximum temperature value of the battery cell module, and the number of times the temperature in the battery cell module meets the preset temperature rise requirements according to the temperature value measured by the temperature sensor of the battery cell module, it is determined whether the temperature value measured by the temperature sensor of the battery cell module is valid. If the temperature value measured by the temperature sensor of the battery cell module is valid, the temperature rise rate of the battery cell module, the maximum temperature value of the battery cell module, and the number of times the temperature in the battery cell module meets the preset temperature rise requirements are determined.

[0124] In one example, when the temperature rise rate in at least one battery cell module exceeds the second preset temperature rise rate threshold, the duration of the temperature rise rate in at least one battery cell module is obtained. Then, according to the duration of the temperature rise rate in at least one battery cell module, the first level of the second thermal runaway warning level is determined.

[0125] Specifically, when the temperature rise rate in all battery modules does not exceed the second preset temperature rise rate threshold, the first level of the second thermal runaway warning level is determined to be 0. When the temperature rise rate in at least one battery module exceeds the second preset temperature rise rate threshold, the duration of the temperature rise rate in the corresponding battery module is obtained. When the duration of the temperature rise rate in the corresponding battery module exceeds the fifth preset duration, the first level of the second thermal runaway warning level is determined to be 2. When the duration of the temperature rise rate in the corresponding battery module does not exceed the fifth preset duration, and when the duration of the temperature rise rate in the corresponding battery module exceeds the sixth preset duration, the first level of the second thermal runaway warning level is determined to be 1. When the duration of the temperature rise rate in the corresponding battery module does not exceed the sixth preset duration, the first level of the second thermal runaway warning level is determined to be 0. The fifth preset duration is greater than the sixth preset duration.

[0126] The second preset temperature rise rate threshold is a pre-calibrated value, for example, 5° / s. The fifth preset time length is a pre-calibrated value, for example, 2s. The sixth preset time length is a pre-calibrated value, for example, 1s.

[0127] In one example, when the maximum temperature value in at least one battery cell module exceeds the second preset temperature threshold, the duration of the maximum temperature value in at least one battery cell module is obtained. Then, according to the duration of the maximum temperature value in at least one battery cell module, the second level of the second thermal runaway warning level is determined.

[0128] Specifically, when the maximum temperature values ​​in all battery modules do not exceed the second preset temperature threshold, the second level of the second thermal runaway warning level is determined to be 0. When the maximum temperature value in at least one battery module exceeds the second preset temperature threshold, the duration of the corresponding maximum temperature value in the battery module is obtained. When the duration of the maximum temperature value in the corresponding battery module exceeds the seventh preset duration, the second level of the second thermal runaway warning level is determined to be 2. When the duration of the maximum temperature value in the corresponding battery module does not exceed the seventh preset duration, and the duration of the maximum temperature value in the corresponding battery module exceeds the eighth preset duration, the second level of the second thermal runaway warning level is determined to be 1. When the duration of the maximum temperature value in the corresponding battery module does not exceed the eighth preset duration, the second level of the second thermal runaway warning level is determined to be 0. The seventh preset duration is greater than the eighth preset duration.

[0129] The second preset temperature threshold is a pre-calibrated value. The seventh preset time length is a pre-calibrated value, for example, 2s. The eighth preset time length is a pre-calibrated value, for example, 1s.

[0130] In one embodiment, the temperature in each battery module and the preset temperature difference threshold value within a sampling period are obtained. Based on the temperature in each battery module at each sampling moment, the average temperature value of the temperature in all battery modules at each sampling moment is determined. Based on the temperature in each battery module at each sampling moment, the average temperature value of the temperature in all battery modules at each sampling moment, and the preset temperature difference threshold value, the temperature outlier risk level of each battery module at each sampling moment is determined. Based on the temperature outlier risk level of each battery module at each sampling moment, the number of upgrades of the temperature outlier risk level of each battery module is determined.

[0131] Specifically, based on a sampling moment, according to the temperature in each battery cell module at the sampling moment, the average temperature value of the temperature in all battery cell modules at the sampling moment is calculated. The temperature value in each battery cell module at the sampling moment is subtracted from the average temperature value to obtain the temperature difference value between the temperature value in each battery cell module at the sampling moment and the average temperature value. Then, according to the temperature difference value between the temperature value in each battery cell module at the sampling moment and the average temperature value and the temperature difference threshold, the temperature outlier risk level of each battery cell module at the sampling moment is obtained. For example, the temperature outlier risk level of each battery cell module at a sampling moment can be determined according to the quotient value obtained by dividing the temperature difference value by the temperature difference threshold. The quotient value may be an integer or not. According to the temperature outlier risk level of each battery cell module at all sampling moments, the number of upgrades of the temperature outlier risk level of each battery cell module is determined.

[0132] It should be noted that, based on a sampling moment, according to the temperature inside each battery cell module at the sampling moment, the highest temperature value and the lowest temperature value of each battery cell module are eliminated to obtain the average temperature value of the temperature inside all battery cell modules at the sampling moment.

[0133] In the case where the number of upgrades of the temperature outlier risk level of at least one battery module exceeds the first preset number of times, the third level of the second thermal runaway warning level is determined to be level 2. In the case where the number of upgrades of the temperature outlier risk level of all battery modules does not exceed the first preset number of times, and the number of upgrades of the temperature outlier risk level of at least one battery module exceeds the second preset number of times, the third level of the second thermal runaway warning level is determined to be level 1. In the case where the number of upgrades of the temperature outlier risk level of all battery modules does not exceed the second preset number of times, the third level of the second thermal runaway warning level is determined to be level 0. The first preset number of times is higher than the second preset number of times.

[0134] For example, there are multiple battery modules, and battery module No. 1 and battery module No. 2 are taken as examples for specific description. At sampling time t1, the temperature inside battery module No. 1 is 31°, and the temperature inside battery module No. 2 is 41°. At sampling time t1, the average temperature value of the temperature inside all battery modules is 25°. The temperature difference threshold ΔT is 3°. At sampling time t1, the temperature outlier risk level of battery module No. 1 is level 2 (2*ΔT<6°<3*ΔT), and the temperature outlier risk level of battery module No. 2 is level 5 (5*ΔT<16°<6*ΔT). In one sampling period, the temperature outlier risk level of battery module No. 1 is upgraded from level 2 to level 3, then from level 3 to level 4, and finally from level 4 to level 5. The temperature outlier risk level of battery module No. 2 is upgraded from level 3 to level 4. In one sampling period, the temperature outlier risk level of battery module No. 1 is upgraded 3 times. The temperature outlier risk level of cell module No. 2 is upgraded once. The first preset number of times is 2 times, and the second preset number of times is 1 time. Since the number of upgrades of the temperature outlier risk level of cell module No. 1 exceeds the first preset number of times, the third level of the second thermal runaway warning level is determined to be level 2.

[0135] Figure 3 FIG. 1 is a flowchart of a process for determining a second thermal runaway warning level according to an embodiment of the present invention. Figure 3 , determining the second thermal runaway warning level includes steps S301 to S329.

[0136] Step S301, obtaining a temperature value measured by a temperature sensor of the battery cell module.

[0137] Step S302, determining whether the temperature value measured by the temperature sensor of the battery cell module is valid.

[0138] When the judgment result of step S302 is valid, step S303 is executed to determine the temperature rise rate in each battery cell module, the maximum temperature value in each battery cell module and the number of upgrades of the temperature outlier risk level of each battery cell module based on the temperature value measured by the temperature sensor of the battery cell module.

[0139] Step S304, determining whether the temperature rise rate in each battery cell module exceeds a second preset temperature rise rate threshold.

[0140] When the judgment result of step S304 is no, step S305 is executed, and the first level of the second thermal runaway warning level is determined to be 0.

[0141] If the judgment result of step S304 is yes, step S306 is executed to obtain the duration of the temperature rise rate in each battery cell module.

[0142] Step S307 , determining whether the duration of the temperature rise rate in each battery cell module exceeds a fifth preset duration.

[0143] If the judgment result of step S307 is yes, step S308 is executed and the first level of the second thermal runaway warning level is determined to be 2.

[0144] If the result of the determination in step S307 is negative, step S309 is executed to determine whether the duration of the temperature rise rate in each battery cell module exceeds a sixth preset duration. The fifth preset duration is greater than the sixth preset duration.

[0145] If the judgment result of step S309 is yes, step S310 is executed and the first level of the second thermal runaway warning level is determined to be 1.

[0146] When the judgment result of step S309 is no, step S311 is executed, and the first level of the second thermal runaway warning level is determined to be 0.

[0147] Step S312, determining whether there is at least one battery cell module whose maximum temperature value exceeds a second preset temperature threshold.

[0148] When the judgment result of step S312 is no, step S313 is executed and the second level of the second thermal runaway warning level is determined to be 0.

[0149] If the judgment result of step S312 is yes, step S314 is executed to obtain the duration of the highest temperature value in at least one battery cell module.

[0150] Step S315 , determining whether there is at least one battery cell module whose maximum temperature value lasts longer than a seventh preset time period.

[0151] If the judgment result of step S315 is yes, step S316 is executed and the first level of the second thermal runaway warning level is determined to be 2.

[0152] If the result of the determination in step S315 is negative, step S317 is executed to determine whether the duration of the highest temperature value in at least one battery cell module exceeds the eighth preset duration. The seventh preset duration is greater than the eighth preset duration.

[0153] If the determination result of step S317 is yes, step S318 is executed and the second level of the second thermal runaway warning level is determined to be 1.

[0154] When the judgment result of step S317 is negative, step S319 is executed and the second level of the second thermal runaway warning level is determined to be 0.

[0155] Step S320 , based on a sampling cycle, according to the temperature inside each battery cell module at each sampling moment, calculate the average temperature value of the temperature inside all battery cell modules at each sampling moment.

[0156] Step S321 , subtracting the temperature value in each battery cell module at each sampling moment from the corresponding average temperature value, to obtain the temperature difference between the temperature value in each battery cell module at each sampling moment and the average temperature value.

[0157] Step S322, obtaining the temperature outlier risk level of each battery module at each sampling moment according to the temperature difference between the temperature value in each battery module at each sampling moment and the average temperature value and the temperature difference threshold.

[0158] Step S323 , determining the upgrade times of the temperature outlier risk level of each battery module according to the temperature outlier risk level of each battery module at all sampling moments.

[0159] Step S324 , determining whether there is at least one battery cell module whose temperature outlier risk level is upgraded more than a first preset number of times.

[0160] If the determination result of step S324 is yes, step S325 is executed and the third level of the second thermal runaway warning level is determined to be 2.

[0161] If the result of the determination in step S324 is negative, step S326 is executed to determine whether the number of times the temperature outlier risk level of at least one battery cell module is upgraded exceeds a second preset number. The first preset number is higher than the second preset number.

[0162] If the determination result of step S326 is yes, step S327 is executed and the third level of the second thermal runaway warning level is determined to be 1.

[0163] When the determination result of step S326 is negative, step S328 is executed and the third level of the second thermal runaway warning level is determined to be 0.

[0164] Step S329: determining the highest level among the first level of the second thermal runaway warning level, the second level of the second thermal runaway warning level and the third level of the second thermal runaway warning level as the second thermal runaway warning level.

[0165] The second thermal runaway warning level is determined by the battery cell module temperature parameters, which realizes the second thermal runaway warning level of the battery pack determined from the dimension of the battery cell module temperature parameters. In addition, the battery cell module temperature parameters are specifically refined into three parameters: the temperature rise rate in each battery cell module, the maximum temperature value in each battery cell module and the number of upgrades of the temperature outlier risk level of each battery cell module. Based on each parameter, a corresponding thermal runaway warning level can be determined. The second thermal runaway warning level is determined by combining the thermal runaway warning levels corresponding to these three parameters, which is more detailed, more comprehensive and more accurate.

[0166] In one embodiment, the single cell voltage parameter includes the number of times the voltage outlier risk level of each single cell is upgraded. The fourth thermal runaway warning level is determined according to the number of times the voltage outlier risk level of each single cell is upgraded.

[0167] In one embodiment, the voltage value of each single cell and the preset voltage difference threshold value within a sampling period are obtained. According to the voltage value of each single cell at each sampling moment, the average voltage value of all the single cell voltage values ​​at each sampling moment is determined. According to the voltage value of each single cell at each sampling moment, the average voltage value of all the single cell voltage values ​​at each sampling moment, and the preset voltage difference threshold value, the voltage outlier risk level of each single cell at each sampling moment is determined. According to the voltage outlier risk level of each single cell at each sampling moment, the number of times the voltage outlier risk level of each single cell is upgraded is determined.

[0168] Specifically, based on a sampling moment, according to the voltage value of each single cell at the sampling moment, the average voltage value of all the single cell voltage values ​​at the sampling moment is calculated. The voltage value of each single cell at the sampling moment is subtracted from the average voltage value to obtain the voltage difference between the single cell voltage value and the average voltage value. Then, according to the voltage difference between the voltage value of each single cell at the sampling moment and the average voltage value and the voltage difference threshold, the voltage outlier risk level of each single cell at the sampling moment is obtained. For example, the voltage outlier risk level of each single cell at a sampling moment can be determined according to the quotient value obtained by dividing the voltage difference value by the voltage difference threshold. The quotient value may be an integer or not. According to the voltage outlier risk level of each single cell at all sampling moments, the number of times the voltage outlier risk level of each single cell is upgraded is determined.

[0169] It should be noted that based on a sampling moment, according to the voltage value of each single cell at the sampling moment, the highest voltage value of each single cell and the lowest voltage value of each single cell are eliminated to obtain the average voltage value of the voltage values ​​of all single cells at the sampling moment.

[0170] When the number of times the voltage outlier risk level of at least one single cell is upgraded exceeds the third preset number of times, the third thermal runaway warning level is determined to be level 2. When the number of times the voltage outlier risk level of all single cells is upgraded does not exceed the third preset number of times, and the number of times the voltage outlier risk level of at least one single cell is upgraded exceeds the fourth preset number of times, the third thermal runaway warning level is determined to be level 1. When the number of times the voltage outlier risk level of all single cells is upgraded does not exceed the fourth preset number of times, the third thermal runaway warning level is determined to be level 0. The third preset number of times is higher than the fourth preset number of times.

[0171] For example, there are multiple single cells, and a specific description is given by taking single cell No. 1 and single cell No. 2 as examples. At sampling time t1, the voltage value of single cell No. 1 is 3V, and the voltage value of single cell No. 2 is 2.7V. At sampling time t1, the average voltage value of the voltage values ​​of all single cells is 2.5V. The voltage difference threshold ΔV is 0.3V. At sampling time t1, the voltage outlier risk level of single cell No. 1 is level 1 (1*ΔV<0.5V<2*ΔV), and the voltage outlier risk level of single cell No. 2 is level 0 (0*ΔV<0.2V<1*ΔV). Within a sampling cycle, the voltage outlier risk level of single cell No. 1 is upgraded from level 1 to level 2. The voltage outlier risk level of single cell No. 2 is upgraded from level 0 to level 1, and then from level 1 to level 2. Within a sampling cycle, the voltage outlier risk level of single cell No. 1 is upgraded once. The voltage outlier risk level of single cell No. 2 is upgraded twice. The first preset number of times is 2 times, and the second preset number of times is 1 time. Since the number of times the voltage outlier risk level of the No. 2 single cell is upgraded exceeds the first preset number of times, the third thermal runaway warning level is determined to be level 2.

[0172] Figure 4 FIG. 1 is a flowchart of a process for determining a third thermal runaway warning level according to an embodiment of the present invention. Figure 4 , determining the third thermal runaway warning level includes steps S401 to S410.

[0173] Step S401, based on a sampling period, obtaining the voltage value of each single cell.

[0174] Step S402, determining whether the voltage value of each single cell is valid.

[0175] When the judgment result of step S402 is valid, step S403 is executed to determine the average voltage value of all the single cell voltage values ​​at each sampling moment according to the voltage value of each single cell at each sampling moment.

[0176] Step S404 , determining the voltage outlier risk level of each single cell at each sampling moment according to the voltage value of each single cell at each sampling moment, the average voltage value of all the voltage values ​​of the single cells at each sampling moment, and the preset voltage difference threshold.

[0177] Step S405 , determining the number of times the voltage outlier risk level of each single cell is upgraded according to the voltage outlier risk level of each single cell at each sampling moment.

[0178] Step S406 , determining whether there is at least one single cell whose voltage outlier risk level is upgraded a number of times exceeding a third preset number of times.

[0179] If the determination result of step S406 is yes, step S407 is executed and the third thermal runaway warning level is determined to be 2.

[0180] If the result of the determination in step S406 is negative, step S408 is executed to determine whether the number of times the voltage outlier risk level of at least one single cell is upgraded exceeds a fourth preset number. The third preset number is higher than the fourth preset number.

[0181] If the determination result of step S408 is yes, step S409 is executed and the third thermal runaway warning level is determined to be 1.

[0182] When the determination result of step S408 is negative, step S410 is executed and the third thermal runaway warning level is determined to be 0.

[0183] The third thermal runaway warning level is determined through the single cell voltage parameters, thereby realizing the third thermal runaway warning level of the battery pack determined from the dimension of the single cell voltage parameters.

[0184] In one embodiment, the abnormal sampling information of the battery cell parameters includes the number of battery cell modules with disconnected temperature sampling, the number of single battery cells with disconnected voltage sampling, and the number of battery cell modules with a temperature drop rate exceeding a preset drop rate threshold.

[0185] The number of battery cell modules where temperature sampling is disconnected is at least one of the number of discontinuous battery cell modules where temperature sampling is disconnected and the number of continuous battery cell modules where temperature sampling is disconnected.

[0186] The number of single cells where voltage sampling is disconnected is at least one of the number of non-continuous single cells where voltage sampling is disconnected and the number of continuous single cells where voltage sampling is disconnected.

[0187] The reason for the disconnection in the sampling may be a short circuit in the single battery cell.

[0188] Based on a battery cell module, the temperature drop rate in the battery cell module is calculated according to the temperature value measured by the temperature sensor of the battery cell module. Specifically, the temperature value measured by the temperature sensor within a sampling period is obtained, and the temperature drop rate in the battery cell module is calculated according to the temperature value measured by the temperature sensor within the sampling period. For example, the temperature drop rate in the battery cell module is calculated according to the lowest temperature value within the sampling period, the highest temperature value within the sampling period, and the sampling time interval between the lowest temperature value and the highest temperature value. It should be noted that, using this calculation method, the condition that needs to be met is that the sampling time of the lowest temperature value is later than the sampling time of the highest temperature value. For another example, the temperature drop rate in the battery cell module is calculated according to the first sampled temperature value, the last sampled temperature value and the length of the sampling period within the sampling period.

[0189] In this embodiment, the first level of the fourth thermal runaway warning level is determined according to the number of battery modules with disconnected temperature sampling. The second level of the fourth thermal runaway warning level is determined according to the number of single battery cells with disconnected voltage sampling. The third level of the fourth thermal runaway warning level is determined according to the number of battery modules with a temperature drop rate exceeding a preset drop rate threshold. The highest level among the first level of the fourth thermal runaway warning level, the second level of the fourth thermal runaway warning level, and the third level of the fourth thermal runaway warning level is determined as the fourth thermal runaway warning level.

[0190] When the number of battery modules with disconnected temperature sampling exceeds the first preset number, the first level of the fourth thermal runaway warning level is determined to be level 2. When the number of battery modules with disconnected temperature sampling does not exceed the first preset number and is greater than 0, the first level of the fourth thermal runaway warning level is determined to be level 1. When the number of battery modules with disconnected temperature sampling is 0, the first level of the fourth thermal runaway warning level is determined to be level 0.

[0191] When the number of single cells with disconnected voltage sampling exceeds the second preset number, the second level of the fourth thermal runaway warning level is determined to be level 2. When the number of single cells with disconnected voltage sampling does not exceed the second preset number and is greater than 0, the second level of the fourth thermal runaway warning level is determined to be level 1. When the number of single cells with disconnected voltage sampling is 0, the second level of the fourth thermal runaway warning level is determined to be level 0.

[0192] When the number of battery cell modules with a temperature drop rate exceeding a preset temperature drop rate threshold exceeds a third preset number, the third level of the fourth thermal runaway warning level is determined to be 2. When the number of battery cell modules with a temperature drop rate exceeding the preset temperature drop rate threshold does not exceed the third preset number and is greater than 0, the third level of the fourth thermal runaway warning level is determined to be 1. When the number of battery cell modules with a temperature drop rate exceeding the preset temperature drop rate threshold is 0, the third level of the fourth thermal runaway warning level is determined to be 0.

[0193] For example, when the temperature sampling of m or more battery cell modules is disconnected, or the temperature sampling of n (n < m) or more adjacent battery cell modules is disconnected, or the voltage sampling of k or more single battery cells is disconnected, or there are h or more battery cell modules with a temperature drop rate exceeding the preset temperature drop rate threshold, the third level of the fourth thermal runaway warning level is determined to be 2.

[0194] Except for the case where the third level of the fourth thermal runaway warning level is 2 as described above, when the temperature sampling of battery cell modules within m is disconnected, or the temperature sampling of n (n < m) or more adjacent battery cell modules within m is disconnected, or the voltage sampling of k or more single battery cells within k is disconnected, or there are h or more battery cell modules with a temperature drop rate exceeding the preset temperature drop rate threshold within h, the third level of the fourth thermal runaway warning level is determined to be 1.

[0195] When the temperature sampling of the battery cell module is not disconnected, and the voltage sampling of the single battery cell is not disconnected, and there are no battery cell modules with a temperature drop rate exceeding the preset temperature drop rate threshold, the third level of the fourth thermal runaway warning level is determined to be 0.

[0196] Figure 5 It is a processing flowchart for determining the fourth thermal runaway warning level according to an embodiment of the present invention. Refer to Figure 5 , the determination of the second thermal runaway warning level includes steps S501 to S517.

[0197] Step S501, obtain the number of battery cell modules with disconnected temperature sampling, the number of single battery cells with disconnected voltage sampling, and the number of battery cell modules with a temperature drop rate exceeding the preset temperature drop rate threshold.

[0198] Step S502, determine whether the number of battery cell modules with disconnected temperature sampling exceeds a first preset number.

[0199] When the determination result in step S502 is yes, execute step S503, and the first level of the fourth thermal runaway warning level is determined to be 2.

[0200] When the judgment result of step S502 is no, step S504 is executed to judge whether the number of battery cell modules with disconnected temperature sampling is greater than 0.

[0201] If the determination result of step S504 is yes, step S505 is executed and the first level of the fourth thermal runaway warning level is determined to be 1.

[0202] When the determination result of step S504 is negative, step S506 is executed and the first level of the fourth thermal runaway warning level is determined to be 1.

[0203] Step S507 , determining whether the number of single cells with disconnected voltage sampling exceeds a second preset number.

[0204] If the determination result of step S507 is yes, step S508 is executed and the second level of the fourth thermal runaway warning level is determined to be 2.

[0205] If the determination result of step S507 is no, step S509 is executed to determine whether the number of single cells whose voltage sampling is disconnected is greater than 0.

[0206] If the determination result of step S509 is yes, step S510 is executed and the third level of the fourth thermal runaway warning level is determined to be 1.

[0207] When the determination result of step S509 is negative, step S511 is executed, and the first level of the fourth thermal runaway warning level is determined to be 0.

[0208] Step S512, determining whether the number of battery cell modules whose temperature drop rate exceeds a preset drop rate threshold value exceeds a third preset number.

[0209] If the determination result of step S512 is yes, step S513 is executed and the third level of the fourth thermal runaway warning level is determined to be 2.

[0210] When the determination result of step S512 is no, step S514 is executed to determine whether the number of battery cell modules whose temperature drop rate exceeds a preset drop rate threshold is greater than 0.

[0211] If the determination result of step S514 is yes, step S515 is executed and the third level of the fourth thermal runaway warning level is determined to be 1.

[0212] If the determination result of step S514 is negative, step S516 is executed and the third level of the fourth thermal runaway warning level is determined to be 0.

[0213] In step S517, the highest level among the first level of the fourth thermal runaway warning level, the second level of the fourth thermal runaway warning level and the third level of the fourth thermal runaway warning level is determined as the fourth thermal runaway warning level.

[0214] The fourth thermal runaway warning level is determined through the abnormal sampling information of the battery cell parameters, which realizes the determination of the fourth thermal runaway warning level of the battery pack from the dimension of the abnormal sampling information of the battery cell parameters. In addition, the abnormal sampling information of the battery cell parameters is specifically refined into three parameters: the number of battery cell modules with broken temperature sampling, the number of single battery cells with broken voltage sampling, and the number of battery cell modules whose temperature drop rate exceeds a preset drop rate threshold. Based on each parameter, a corresponding thermal runaway warning level can be determined. The fourth thermal runaway warning level is determined by combining the thermal runaway warning levels corresponding to these three parameters, which is more detailed, more comprehensive, and more accurate.

[0215] In one embodiment, the weight values ​​corresponding to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, and the fourth thermal runaway warning level are obtained. The thermal runaway warning level of the battery pack is determined according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, the fourth thermal runaway warning level, and the corresponding weight values.

[0216] The weight value corresponding to the first thermal runaway warning level, the weight value corresponding to the second thermal runaway warning level, the weight value corresponding to the third thermal runaway warning level, and the weight value corresponding to the fourth thermal runaway warning level can be set according to requirements.

[0217] Step S130: issuing a corresponding warning message according to the thermal runaway warning level of the battery pack.

[0218] Different battery pack thermal runaway warning levels correspond to different warning messages. For example, when the battery pack thermal runaway warning level is the highest level, the warning message issued is "The vehicle battery pack has thermal runaway, please stay away from the vehicle." When the battery pack thermal runaway warning level is a lower level, the warning message issued is "The vehicle may be at risk of thermal runaway."

[0219] The battery pack thermal runaway warning method provided by the present invention obtains at least two parameters of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell and the abnormal sampling information of the battery cell parameters, determines the thermal runaway warning level of the battery pack according to at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell and the abnormal sampling information of the battery cell parameters, and issues corresponding warning information according to the thermal runaway warning level of the battery pack. It can determine the thermal runaway warning level of the battery pack from multiple dimensions, and issue corresponding warning information based on different thermal runaway warning levels of the battery pack, which is more detailed, improves accuracy and reduces the risk of false alarms.

[0220] <Device Example>

[0221] An embodiment of the present invention provides a battery pack thermal runaway warning device, such as Figure 6 The battery pack thermal runaway warning device 600 includes a thermal runaway detection parameter determination module 610 , a thermal runaway warning level determination module 620 and a warning information issuing module 630 .

[0222] The thermal runaway detection parameter determination module 610 is used to determine the thermal runaway detection parameters of the battery pack; wherein the thermal runaway detection parameters of the battery pack include at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, and the abnormal battery cell parameters and the invalid sampling information of the battery cell parameters.

[0223] The thermal runaway warning level determination module 620 is used to determine the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters.

[0224] The warning information issuing module 630 is used to issue corresponding warning information according to the thermal runaway warning level of the battery pack.

[0225] In one embodiment, the thermal runaway warning level determination module 620 is also used to determine the thermal runaway warning level of the battery pack according to the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell and the abnormal sampling information of the battery cell parameters when the thermal runaway detection parameters of the battery pack include the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell and the abnormal sampling information of the battery cell parameters.

[0226] In one embodiment, the thermal runaway warning level determination module 620 is also used to determine the first thermal runaway warning level according to the temperature parameters at the explosion-proof valve, determine the second thermal runaway warning level according to the temperature parameters of the battery cell module, determine the third thermal runaway warning level according to the voltage parameters of the single battery cell, and determine the fourth thermal runaway warning level according to the abnormal sampling information of the battery cell parameters; determine the thermal runaway warning level of the battery pack according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level and the fourth thermal runaway warning level.

[0227] In one embodiment, a temperature sensor is installed at the explosion-proof valve on the battery pack, and the temperature sensor is used to collect the temperature at the explosion-proof valve.

[0228] In one embodiment, the temperature parameter at the explosion-proof valve includes the temperature rise rate at the explosion-proof valve and the maximum temperature value at the explosion-proof valve. The thermal runaway warning level determination module 620 is also used to determine the first level of the first thermal runaway warning level according to the temperature rise rate at the explosion-proof valve, and determine the second level of the first thermal runaway warning level according to the maximum temperature value at the explosion-proof valve; and determine the highest level of the first level of the first thermal runaway warning level and the second level of the first thermal runaway warning level as the first thermal runaway warning level.

[0229] In one embodiment, the thermal runaway warning level determination module 620 is also used to obtain the duration of the temperature rise rate at the explosion-proof valve when the temperature rise rate at the explosion-proof valve exceeds a first preset temperature rise rate threshold; determine the first level of the first thermal runaway warning level according to the duration of the temperature rise rate at the explosion-proof valve; and, when the maximum temperature value at the explosion-proof valve exceeds the first preset temperature threshold, obtain the duration of the maximum temperature value at the explosion-proof valve; determine the second level of the first thermal runaway warning level according to the duration of the maximum temperature value at the explosion-proof valve.

[0230] In one embodiment, the temperature parameters of the battery module include the temperature rise rate in each battery module, the maximum temperature value in each battery module and the number of upgrades of the temperature outlier risk level of each battery module. The thermal runaway warning level determination module 620 is also used to determine the first level of the second thermal runaway warning level according to the temperature rise rate in each battery module, determine the second level of the second thermal runaway warning level according to the maximum temperature value in each battery module, and determine the third level of the second thermal runaway warning level according to the number of upgrades of the temperature outlier risk level of each battery module; determine the highest level among the first level of the second thermal runaway warning level, the second level of the second thermal runaway warning level and the third level of the second thermal runaway warning level as the second thermal runaway warning level.

[0231] In one embodiment, the thermal runaway warning level determination module 620 is also used to obtain the duration of the temperature rise rate in at least one battery cell module when the temperature rise rate in at least one battery cell module exceeds a second preset temperature rise rate threshold; determine the first level of the second thermal runaway warning level according to the duration of the temperature rise rate in at least one battery cell module; obtain the duration of the maximum temperature value in at least one battery cell module when the maximum temperature value in at least one battery cell module exceeds the second preset temperature threshold; determine the second level of the second thermal runaway warning level according to the duration of the maximum temperature value in at least one battery cell module.

[0232] In one embodiment, the battery pack thermal runaway warning device also includes a module for determining the temperature outlier risk level of the battery module. The module for determining the temperature outlier risk level of the battery module is used to obtain the temperature in each battery module and the preset temperature difference threshold within a sampling period; determine the average temperature value of the temperature in all battery modules at each sampling moment according to the temperature in each battery module at each sampling moment; determine the temperature outlier risk level of each battery module at each sampling moment according to the temperature in each battery module at each sampling moment, the average temperature value of the temperature in all battery modules at each sampling moment, and the preset temperature difference threshold; determine the number of upgrades of the temperature outlier risk level of each battery module according to the temperature outlier risk level of each battery module at each sampling moment.

[0233] In one embodiment, the cell voltage parameter includes the number of times the voltage outlier risk level of each cell is upgraded. The thermal runaway warning level determination module 620 is further configured to determine a fourth thermal runaway warning level according to the number of times the voltage outlier risk level of each cell is upgraded.

[0234] In one embodiment, the battery pack thermal runaway warning device also includes a module for determining the voltage outlier risk level of a single cell. The module for determining the voltage outlier risk level of a single cell is used to obtain the voltage value of each single cell and a preset voltage difference threshold value within a sampling period; determine the average voltage value of all single cell voltage values ​​at each sampling moment according to the voltage value of each single cell at each sampling moment; determine the voltage outlier risk level of each single cell at each sampling moment according to the voltage value of each single cell at each sampling moment, the average voltage value of all single cell voltage values ​​at each sampling moment, and the preset voltage difference threshold value; determine the number of times the voltage outlier risk level of each single cell is upgraded according to the voltage outlier risk level of each single cell at each sampling moment.

[0235] In one embodiment, the abnormal sampling information of the battery cell parameters includes the number of battery cell modules with disconnected temperature sampling, the number of single battery cells with disconnected voltage sampling, and the number of battery cell modules with a temperature drop rate exceeding a preset drop rate threshold. The thermal runaway warning level determination module 620 is also used to determine the first level of the fourth thermal runaway warning level according to the number of battery cell modules with disconnected temperature sampling; determine the second level of the fourth thermal runaway warning level according to the number of single battery cells with disconnected voltage sampling; determine the third level of the fourth thermal runaway warning level according to the number of battery cell modules with a temperature drop rate exceeding a preset drop rate threshold; and determine the highest level among the first level of the fourth thermal runaway warning level, the second level of the fourth thermal runaway warning level, and the third level of the fourth thermal runaway warning level as the fourth thermal runaway warning level.

[0236] In one embodiment, the number of battery cell modules where temperature sampling is broken is at least one of the number of discontinuous battery cell modules where temperature sampling is broken and the number of continuous battery cell modules where temperature sampling is broken, and the number of single battery cells where voltage sampling is broken includes at least one of the number of discontinuous single battery cells where voltage sampling is broken and the number of continuous single battery cells where voltage sampling is broken.

[0237] In one embodiment, the thermal runaway warning level determination module 620 is also used to obtain the weight values ​​corresponding to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level and the fourth thermal runaway warning level; and determine the thermal runaway warning level of the battery pack according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, the fourth thermal runaway warning level and the corresponding weight values.

[0238] An embodiment of the present invention provides a battery pack thermal runaway warning device, such as Figure 7 The battery pack thermal runaway warning device 700 includes a memory 710 and a processor 720. The memory 710 stores a computer program, and the computer program is used to control the processor 720 to operate to execute the battery pack thermal runaway warning method in any of the above embodiments.

[0239] An embodiment of the present invention provides a battery management system, including a battery pack thermal runaway warning device as provided in any of the above embodiments. Figure 8 .

[0240] An embodiment of the present invention provides a battery pack, including a battery management system as provided in the above embodiment. Fig. 9 .

[0241] An embodiment of the present invention provides an electric device, including a battery pack as provided in the above embodiment. Fig.10 The electrical equipment may be an electric vehicle.

[0242] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the electric vehicle embodiment, its related parts can be referred to the partial description of the method embodiment.

[0243] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0244] The embodiments of the present specification may be systems, methods and / or computer program products. The computer program product may include a computer-readable storage medium carrying computer instructions for causing a processor to implement various aspects of the embodiments of the present specification.

[0245] A computer-readable storage medium may be a tangible device that can hold and store computer instructions used by a computer instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which computer instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0246] The computer instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer instructions from the network and forwards the computer instructions for storage in the computer-readable storage medium in each computing / processing device.

[0247] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to the multiple embodiments of this specification. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a computer instruction, and a part of a module, a program segment or a computer instruction contains one or more executable computer instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0248] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery pack thermal runaway early warning method, characterized in that: include: Determine the battery pack thermal runaway detection parameters; wherein the battery pack thermal runaway detection parameters include at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, and abnormal sampling information of the battery cell parameters; Determining a battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters; According to the thermal runaway warning level of the battery pack, a corresponding warning message is issued.

2. The method according to claim 1, characterized in that In the case where the battery pack thermal runaway detection parameters include temperature parameters at the explosion-proof valve, temperature parameters of the battery cell module, voltage parameters of the single battery cell, and abnormal sampling information of battery cell parameters, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameters includes: The thermal runaway warning level of the battery pack is determined according to the temperature parameter at the explosion-proof valve, the temperature parameter of the battery module, the voltage parameter of the single battery cell and the abnormal sampling information of the battery cell parameter.

3. The method according to claim 2, characterized in that The step of determining the thermal runaway warning level of the battery pack according to the temperature parameter at the explosion-proof valve, the temperature parameter of the battery module, the voltage parameter of the single battery cell, and the abnormal sampling information of the battery cell parameter includes: Determine a first thermal runaway warning level according to the temperature parameter at the explosion-proof valve, determine a second thermal runaway warning level according to the temperature parameter of the battery module, determine a third thermal runaway warning level according to the single battery cell voltage parameter, and determine a fourth thermal runaway warning level according to abnormal sampling information of the battery cell parameter; The thermal runaway warning level of the battery pack is determined according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level and the fourth thermal runaway warning level.

4. The method according to claim 1, characterized in that: A temperature sensor is installed at the explosion-proof valve arranged on the battery pack, and the temperature sensor is used to collect the temperature at the explosion-proof valve.

5. The method according to claim 1, characterized in that The temperature parameters at the explosion-proof valve include the temperature rise rate at the explosion-proof valve and the maximum temperature value at the explosion-proof valve; wherein, In the case where the battery pack thermal runaway detection parameter includes a temperature parameter at an explosion-proof valve, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes: Determining a first level of a first thermal runaway warning level according to a temperature rise rate at the explosion-proof valve, and determining a second level of the first thermal runaway warning level according to a maximum temperature value at the explosion-proof valve; The highest level of the first level of the first thermal runaway warning level and the second level of the first thermal runaway warning level is determined as the first thermal runaway warning level.

6. The method according to claim 5, characterized in that Determining the first level of the first thermal runaway warning level according to the temperature rise rate at the explosion-proof valve includes: When the temperature rise rate at the explosion-proof valve exceeds a first preset temperature rise rate threshold, obtaining the duration of the temperature rise rate at the explosion-proof valve; determining a first level of the first thermal runaway warning level according to the duration of the temperature rise rate at the explosion-proof valve; and Determining the second level of the first thermal runaway warning level according to the maximum temperature value at the explosion-proof valve includes: When the maximum temperature value at the explosion-proof valve exceeds a first preset temperature threshold, obtaining a duration of the maximum temperature value at the explosion-proof valve; A second level of the first thermal runaway warning level is determined according to the duration of the highest temperature value at the explosion-proof valve.

7. The method according to claim 1, characterized in that The battery module temperature parameters include the temperature rise rate in each battery module, the maximum temperature value in each battery module and the number of upgrades of the temperature outlier risk level of each battery module; wherein, In the case where the battery pack thermal runaway detection parameter includes a battery cell module temperature parameter, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes: Determining a first level of a second thermal runaway warning level according to the temperature rise rate in each battery module, determining a second level of a second thermal runaway warning level according to the maximum temperature value in each battery module, and determining a third level of a second thermal runaway warning level according to the number of upgrades of the temperature outlier risk level of each battery module; A highest level among the first level of the second thermal runaway warning level, the second level of the second thermal runaway warning level, and the third level of the second thermal runaway warning level is determined as the second thermal runaway warning level.

8. The method according to claim 7, characterized in that Determining the first level of the second thermal runaway warning level according to the temperature rise rate in each battery cell module includes: When the temperature rise rate in at least one battery cell module exceeds a second preset temperature rise rate threshold, obtaining the duration of the temperature rise rate in the at least one battery cell module; Determining a first level of the second thermal runaway warning level according to a duration of a temperature rise rate in the at least one battery cell module; The second level of determining the second thermal runaway warning level according to the maximum temperature value in each battery cell module includes: When the maximum temperature value in the at least one battery cell module exceeds a second preset temperature threshold, obtaining a duration of the maximum temperature value in the at least one battery cell module; A second level of the second thermal runaway warning level is determined according to the duration of the highest temperature value in the at least one battery cell module.

9. The method according to claim 7 or 8, characterized in that: Before determining the third level of the second thermal runaway warning level according to the upgrade times of the temperature outlier risk level of each battery cell module, the method further includes: Obtain the temperature of each battery cell module and the preset temperature difference threshold within a sampling period; According to the temperature inside each battery cell module at each sampling moment, determine the average temperature value inside all battery cell modules at each sampling moment; Determine the temperature outlier risk level of each battery module at each sampling moment according to the temperature in each battery module at each sampling moment, the average temperature value of the temperature in all battery modules at each sampling moment, and the preset temperature difference threshold; According to the temperature outlier risk level of each battery module at each sampling moment, the number of upgrades of the temperature outlier risk level of each battery module is determined.

10. The method according to claim 1, characterized in that The single cell voltage parameter includes the number of times the voltage outlier risk level of each single cell is upgraded; wherein, In the case where the battery pack thermal runaway detection parameter includes a single cell voltage parameter, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes: A fourth thermal runaway warning level is determined according to the number of times the voltage outlier risk level of each single battery cell is upgraded.

11. The method according to claim 10, characterized in that Before determining the fourth thermal runaway warning level according to the number of upgrades of the voltage outlier risk level of each single battery cell, the method further includes: Obtain the voltage value of each single cell and the preset voltage difference threshold within a sampling period; According to the voltage value of each single cell at each sampling moment, determine the average voltage value of all the single cell voltage values ​​at each sampling moment; Determine the voltage outlier risk level of each single cell at each sampling moment according to the voltage value of each single cell at each sampling moment, the average voltage value of all the voltage values ​​of the single cells at each sampling moment, and the preset voltage difference threshold; According to the voltage outlier risk level of each single cell at each sampling moment, the number of times the voltage outlier risk level of each single cell is upgraded is determined.

12. The method according to claim 1, characterized in that The abnormal sampling information of the battery cell parameters includes the number of battery cell modules with disconnected temperature sampling, the number of single battery cells with disconnected voltage sampling, and the number of battery cell modules with a temperature drop rate exceeding a preset drop rate threshold; wherein, In the case where the battery pack thermal runaway detection parameter includes abnormal sampling information of a cell parameter, determining the battery pack thermal runaway warning level according to the battery pack thermal runaway detection parameter includes: Determining a first level of a fourth thermal runaway warning level according to the number of battery cell modules where disconnection occurs in the temperature sampling; Determining a second level of the fourth thermal runaway warning level according to the number of single cells in which the voltage sampling is disconnected; Determining a third level of a fourth thermal runaway warning level according to the number of battery cell modules whose temperature drop rate exceeds a preset drop rate threshold; The highest level among the first level of the fourth thermal runaway warning level, the second level of the fourth thermal runaway warning level and the third level of the fourth thermal runaway warning level is determined as the fourth thermal runaway warning level.

13. The method according to claim 12, characterized in that The number of battery cell modules where the temperature sampling is disconnected is at least one of the number of discontinuous battery cell modules where the temperature sampling is disconnected and the number of continuous battery cell modules where the temperature sampling is disconnected. The number of single cells where voltage sampling is disconnected includes at least one of the number of non-continuous single cells where voltage sampling is disconnected and the number of continuous single cells where voltage sampling is disconnected.

14. The method according to claim 3, characterized in that The determining the thermal runaway warning level of the battery pack according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, and the fourth thermal runaway warning level includes: Obtaining weight values ​​corresponding to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, and the fourth thermal runaway warning level; The thermal runaway warning level of the battery pack is determined according to the first thermal runaway warning level, the second thermal runaway warning level, the third thermal runaway warning level, the fourth thermal runaway warning level and corresponding weight values.

15. A battery pack thermal runaway warning device, characterized in that: include: A thermal runaway detection parameter determination module, used to determine the thermal runaway detection parameters of the battery pack; wherein the thermal runaway detection parameters of the battery pack include at least two of the temperature parameters at the explosion-proof valve, the temperature parameters of the battery cell module, the voltage parameters of the single battery cell, the abnormal parameters of the battery cell, and the invalid sampling information of the battery cell parameters; A thermal runaway warning level determination module, used to determine the thermal runaway warning level of the battery pack according to the thermal runaway detection parameters of the battery pack; The warning information issuing module is used to issue corresponding warning information according to the thermal runaway warning level of the battery pack.

16. A battery pack thermal runaway warning device, characterized in that: include: A memory and a processor, wherein the memory stores computer instructions, and when the computer instructions are executed by the processor, the battery pack thermal runaway warning method according to any one of claims 1 to 14 is implemented.

17. A battery management system, characterized in that: Including the battery pack thermal runaway warning device as described in claim 15 or 16.

18. A battery pack, characterized in that: Comprising a battery management system as claimed in claim 17.

19. An electrical equipment, characterized in that: Comprising the battery pack as claimed in claim 18.

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