Liquid temperature control method, device and equipment for lithium battery and storage medium

Abstract

The invention relates to the technical field of energy storage batteries, in particular to a liquid temperature control method, device and equipment for a lithium battery and a storage medium, and is used for solving the problem of low effect of a lithium battery temperature control means in related technologies. When the actual current value, the total resistance value and the first cooling temperature difference of at least one battery cell module in the other battery cell modules in the first historical time period are not rising and the temperature change trend of at least one battery cell module in the other battery cell modules in the first historical time period is not rising, executing the following operations for each first battery cell module: determining the liquid immersion height of the first battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference of the first battery cell module; opening a valve of the first battery cell module, and when a liquid level sensor in the first battery cell module monitors that the liquid level of the cooling liquid reaches the liquid immersion height, reducing the opening degree of the valve so as to keep the first battery cell module immersed in the cooling liquid at the liquid immersion height; therefore, accurate temperature control of the battery cell module is realized.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage batteries, and in particular to a liquid temperature control method, device, equipment and storage medium for lithium batteries. Background Art

[0002] Lithium battery products are widely used in various industries due to their high energy density and long cycle life. At present, in order to store more electricity, multiple battery modules are usually stacked in lithium batteries. However, since lithium batteries are extremely sensitive to temperature, overheating and overcooling will cause the battery performance and safety performance to decline. This stacking structure increases the risk of thermal runaway and fire.

[0003] In the related technologies, fan cooling, compressor cooling, cold plate cooling and aerosol fire extinguishing are mostly used to control the temperature of lithium batteries. However, it has been verified that the temperature control effect of the above methods is not good, the economic benefits are not high, and there is even a risk of re-ignition. Summary of the invention

[0004] The embodiments of the present application provide a liquid temperature control method, device, equipment and storage medium for a lithium battery, which are used to maximize the use of limited cooling capacity to achieve precise temperature control of the lithium battery and avoid the risk of thermal runaway of the battery cell when the coolant is limited.

[0005] The specific technical solutions provided by the embodiments of this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a liquid temperature control method for a lithium battery, which is applied to an electronic device powered by a lithium battery, wherein the lithium battery includes a plurality of battery cell modules deployed in a stacked structure, and the method includes:

[0007] The actual temperature of each battery cell module is monitored by a temperature sensor between every two battery cell modules;

[0008] When it is monitored that the actual temperature of any battery cell module is in the first temperature range, and at least one of the other battery cell modules has a temperature change trend that is not an upward trend within the first historical time period, the following operation is performed for each first battery cell module, where any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend:

[0009] Determine the liquid immersion height of any of the first battery cell modules based on the actual current value, the total resistance value and the first cooling temperature difference of any of the first battery cell modules, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature;

[0010] Open the valve of any of the first battery cell modules, and when the coolant level detects through the liquid level sensor in any of the first battery cell modules that the coolant level reaches the liquid immersion height, reduce the opening of the valve to keep any of the first battery cell modules immersed in the coolant at the liquid immersion height.

[0011] In a possible implementation, if it is monitored that the actual temperature of any one of the battery cell modules is within the first temperature range, and the temperature change trends of other battery cell modules within the first historical time period are all upward trends, then the liquid immersion height of any one of the first battery cell modules is a reference immersion height, and the reference immersion height is based on the total mass of the coolant that can be stored in the liquid storage tank in the electronic device, the total number of the battery cell modules, the coolant density and the bottom area of ​​each battery cell module, and the lower limit value of the mass of the coolant circulation.

[0012] In a possible implementation manner, after the coolant level of any one of the first battery cell modules is stabilized at the liquid immersion height, the method further includes:

[0013] Continuously monitoring the actual temperature of any one of the first battery cell modules;

[0014] If it is determined that the temperature change trend of any one of the first battery cell modules within the first time period is a downward trend, keeping the opening of the valve unchanged;

[0015] If it is determined that the temperature change trend of any one of the first battery cell modules within the first time period is an upward trend, the liquid immersion height of any one of the first battery cell modules is updated based on the liquid immersion height and the reference immersion height, and based on the updated liquid immersion height, the valve opening of any one of the first battery cell modules is adjusted to keep any one of the first battery cell modules immersed in the coolant at the updated liquid immersion height.

[0016] In a possible implementation, the method further includes:

[0017] If the actual temperature of any first battery cell module is restored to the second temperature range after cooling and temperature control, the valve is closed, and the upper limit value of the second temperature range is less than the lower limit value of the first temperature range.

[0018] In a possible implementation, the method further includes:

[0019] When it is monitored that the actual temperature of any battery cell module reaches a temperature threshold, controlling the valve of any battery cell module to be at the maximum opening, and the temperature threshold is greater than the upper limit value of the first temperature interval;

[0020] If it is determined that there are a plurality of other battery cell modules whose temperature change trends in the second historical time period are rising trends, then based on the temperature data of the plurality of other battery cell modules in the second historical time period, screen out other battery cell modules whose rising rates exceed the average rising rate from the plurality of other battery cell modules;

[0021] Determining the liquid immersion height of each of the other battery cell modules based on the actual current value, the total resistance value and the second cooling temperature difference of each of the other battery cell modules, respectively, wherein the second cooling temperature difference is the difference between the lower limit value of the first temperature range and the ambient temperature;

[0022] Based on the liquid immersion heights of the other battery cell modules, the respective valves are adjusted to allow the other battery cell modules to be immersed in the coolant at the respective liquid immersion heights.

[0023] In a possible implementation, the method further includes:

[0024] Continuously monitoring the actual temperature of any one of the battery cell modules and each of the other battery cell modules;

[0025] If it is determined that there is a second battery cell module in any of the battery cell modules and each of the other battery cell modules, and the temperature change trend in the second time period is a downward trend, then after determining that the actual temperature of the second battery cell module has recovered to the second temperature interval, the valve of the second battery cell module is closed, and the upper limit value of the second temperature interval is less than the lower limit value of the first temperature interval;

[0026] If it is determined that there is a third battery cell module in any of the battery cell modules and the other battery cell modules, the temperature change trend of which is an upward trend in the second time period, a high temperature alarm signal for the third battery cell module is issued.

[0027] In a possible implementation manner, after controlling the valve of any battery cell module to be at the maximum opening, the method further includes:

[0028] If it is determined that the temperature change trend of any other battery cell module in the second historical time period is a downward trend, determining the liquid immersion height of any other battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference of any other battery cell module;

[0029] Based on the determined liquid immersion height, adjusting the valve of any other battery cell module so that any other battery cell module is immersed in the coolant at the corresponding liquid immersion height;

[0030] After screening out other battery cell modules whose rising rates exceed the average rising rate, the method further includes:

[0031] Determine the respective liquid immersion heights based on the actual current value, the total resistance value and the first cooling temperature difference of each other battery cell module;

[0032] Based on the determined liquid immersion height and the reference immersion height, respective target immersion heights are determined, and based on the respective target immersion heights, corresponding valves are adjusted so that each other battery cell module is immersed in the coolant at the respective corresponding target immersion height.

[0033] In a second aspect, an embodiment of the present application provides a liquid temperature control device for a lithium battery, which is applied to an electronic device powered by a lithium battery, wherein the lithium battery includes a plurality of battery cell modules deployed in a stacked structure, and the device includes:

[0034] A monitoring module, used to monitor the actual temperature of each battery cell module through a temperature sensor between every two battery cell modules;

[0035] The temperature control module is used to perform the following operations for each first battery cell module when it is monitored that the actual temperature of any battery cell module is in the first temperature range and the temperature change trend of at least one battery cell module among the other battery cell modules in the first historical time period is not an upward trend. Any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend:

[0036] Determine the liquid immersion height of any of the first battery cell modules based on the actual current value, the total resistance value and the first cooling temperature difference of any of the first battery cell modules, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature;

[0037] Open the valve of any of the first battery cell modules, and when the coolant level detects through the liquid level sensor in any of the first battery cell modules that the coolant level reaches the liquid immersion height, reduce the opening of the valve to keep any of the first battery cell modules immersed in the coolant at the liquid immersion height.

[0038] In a possible implementation, if it is monitored that the actual temperature of any one of the battery cell modules is within the first temperature range, and the temperature change trends of other battery cell modules within the first historical time period are all upward trends, then the liquid immersion height of any one of the first battery cell modules is a reference immersion height, and the reference immersion height is based on the total mass of the coolant that can be stored in the liquid storage tank in the electronic device, the total number of the battery cell modules, the coolant density and the bottom area of ​​each battery cell module, and the lower limit value of the mass of the coolant circulation.

[0039] In a possible implementation manner, after the coolant level of any one of the first battery cell modules is stabilized at the liquid immersion height, the temperature control module is further used to:

[0040] Continuously monitoring the actual temperature of any one of the first battery cell modules;

[0041] If it is determined that the temperature change trend of any of the first battery cell modules within the first time period is a downward trend, keeping the opening of the valve unchanged;

[0042] If it is determined that the temperature change trend of any one of the first battery cell modules within the first time period is an upward trend, the liquid immersion height of any one of the first battery cell modules is updated based on the liquid immersion height and the reference immersion height, and based on the updated liquid immersion height, the valve opening of any one of the first battery cell modules is adjusted to keep any one of the first battery cell modules immersed in the coolant at the updated liquid immersion height.

[0043] In a possible implementation manner, the temperature control module is further used for:

[0044] If the actual temperature of any first battery cell module is restored to the second temperature range after cooling and temperature control, the valve is closed, and the upper limit value of the second temperature range is less than the lower limit value of the first temperature range.

[0045] In a possible implementation manner, the temperature control module is further used for:

[0046] When it is monitored that the actual temperature of any battery cell module reaches a temperature threshold, controlling the valve of any battery cell module to be at the maximum opening, and the temperature threshold is greater than the upper limit value of the first temperature interval;

[0047] If it is determined that there are a plurality of other battery cell modules whose temperature change trends in the second historical time period are rising trends, then based on the temperature data of the plurality of other battery cell modules in the second historical time period, screen out other battery cell modules whose rising rates exceed the average rising rate from the plurality of other battery cell modules;

[0048] Determining the liquid immersion height of each of the other battery cell modules based on the actual current value, the total resistance value and the second cooling temperature difference of each of the other battery cell modules, respectively, wherein the second cooling temperature difference is the difference between the lower limit value of the first temperature range and the ambient temperature;

[0049] Based on the liquid immersion heights of the other battery cell modules, the respective valves are adjusted to allow the other battery cell modules to be immersed in the coolant at the respective liquid immersion heights.

[0050] In a possible implementation manner, the temperature control module is further used for:

[0051] Continuously monitoring the actual temperature of any one of the battery cell modules and each of the other battery cell modules;

[0052] If it is determined that there is a second battery cell module in any of the battery cell modules and each of the other battery cell modules, and the temperature change trend in the second time period is a downward trend, then after determining that the actual temperature of the second battery cell module has recovered to the second temperature interval, the valve of the second battery cell module is closed, and the upper limit value of the second temperature interval is less than the lower limit value of the first temperature interval;

[0053] If it is determined that there is a third battery cell module in any of the battery cell modules and the other battery cell modules, the temperature change trend of which is an upward trend in the second time period, a high temperature alarm signal for the third battery cell module is issued.

[0054] In a possible implementation manner, after controlling the valve of any battery cell module to be at the maximum opening, the temperature control module is further used to:

[0055] If it is determined that the temperature change trend of any other battery cell module in the second historical time period is a downward trend, determining the liquid immersion height of any other battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference of any other battery cell module;

[0056] Based on the determined liquid immersion height, adjusting the valve of any other battery cell module so that any other battery cell module is immersed in the coolant at the corresponding liquid immersion height;

[0057] After screening out other battery cell modules whose rising rates exceed the average rising rate, the temperature control module is further used to:

[0058] Determine the respective liquid immersion heights based on the actual current value, the total resistance value and the first cooling temperature difference of each other battery cell module;

[0059] Based on the determined liquid immersion height and the reference immersion height, respective target immersion heights are determined, and based on the respective target immersion heights, corresponding valves are adjusted so that each other battery cell module is immersed in the coolant at the respective corresponding target immersion height.

[0060] In a third aspect, an embodiment of the present application provides an electronic device, including: a cabinet;

[0061] The cabinet includes a lithium battery, a liquid storage tank, and a control device;

[0062] The lithium battery comprises a plurality of battery modules arranged in a stacked structure, wherein a temperature sensor for monitoring the actual temperature of the battery modules is arranged in every two battery modules, and a liquid level sensor for monitoring the liquid immersion height of the coolant is arranged in each battery module;

[0063] The liquid storage tank is used to store coolant, and the coolant is used to control the temperature of the plurality of battery modules;

[0064] The control device includes a memory for storing computer programs or instructions; and a processor for executing the computer programs or instructions in the memory, so that any method described in the first aspect above is executed.

[0065] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium. When instructions in the storage medium are executed by a processor, the processor is enabled to execute any method described in the first aspect above.

[0066] In a fifth aspect, an embodiment of the present application provides a computer program product, which includes: a computer program code, when the computer program code is run on a computer, the computer executes any method as described in the first aspect above.

[0067] In an embodiment of the present application, the actual temperature of each battery cell module is monitored by a temperature sensor between every two battery cell modules; when it is monitored that the actual temperature of any battery cell module is in the first temperature range, and at least one of the other battery cell modules has a temperature change trend that is not an upward trend within the first historical time period, the following operations are performed for each first battery cell module, where any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend: based on the actual current value, total resistance value and first cooling temperature difference of the first battery cell module, the liquid immersion height of the first battery cell module is determined, and the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature; the valve of the first battery cell module is opened, and when the liquid level sensor in the first battery cell module monitors that the coolant level reaches the liquid immersion height, the valve opening is reduced to keep the first battery cell module immersed in the coolant at the liquid immersion height.

[0068] In the present application, the liquid immersion height of the first battery cell module is determined based on the actual current value, the total resistance value and the first cooling temperature difference of the first battery cell module, wherein the first cooling temperature difference is the difference between the upper limit of the module operating temperature and the ambient temperature; so that only a liquid sensor needs to be added to the battery cell module to associate the coolant level height in the battery cell module with the actual temperature of the telecommunications module, thereby adjusting the coolant flow by controlling the valve of the battery cell module, and then achieving precise temperature control of the battery cell module. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is a schematic diagram of the structure of an electronic device in some embodiments of the present application;

[0070] Figure 2 A schematic diagram of the flow of cooling liquid in an electronic device in some embodiments of the present application;

[0071] Figure 3 This is a schematic diagram of a liquid temperature control process of a lithium battery in some embodiments of the present application;

[0072] Figure 4 This is a schematic diagram of another liquid temperature control process of a lithium battery in some embodiments of the present application;

[0073] Figure 5 This is a schematic diagram of a liquid temperature control process of a lithium battery in some embodiments of the present application;

[0074] Figure 6 This is a schematic diagram of a liquid temperature control process of a lithium battery in some embodiments of the present application;

[0075] Figure 7 This is a schematic diagram of a liquid temperature control process of a lithium battery in some embodiments of the present application;

[0076] Figure 8 This is a schematic diagram of a liquid temperature control process of a lithium battery in some embodiments of the present application;

[0077] Fig. 9 This is a schematic diagram of the overall process of a liquid temperature control strategy in some embodiments of the present application;

[0078] Fig.10 This is a schematic diagram of the overall process of a liquid fire fighting strategy in some embodiments of the present application;

[0079] Fig.11 This is a schematic diagram of the logic architecture of a liquid temperature control device for a lithium battery in some embodiments of the present application;

[0080] Fig.12 This is a schematic diagram of the physical structure of an electronic device in some embodiments of the present application. DETAILED DESCRIPTION

[0081] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0082] It should be noted that the terms "first", "second", "third", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0083] In addition, the term "and / or" in the embodiments of the present application describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0084] In the related technology, there are also methods of controlling the temperature of lithium batteries by liquid cooling, but most of them adopt a cooling method in which the coolant does not directly contact the battery cell module. This method often requires the addition of liquid circulation pipelines inside the battery cell module, which increases the construction cost and maintenance cost.

[0085] In view of this, in order to solve the problem of low effect of lithium battery temperature control means in the related art, an embodiment of the present application provides a liquid temperature control method for a lithium battery, which is applied to an electronic device powered by a lithium battery, wherein the lithium battery comprises a plurality of battery modules arranged in a stacked structure. In the embodiment of the present application, the actual temperature of each battery module is monitored by a temperature sensor between every two battery modules; when it is monitored that the actual temperature of any battery module is within a first temperature range, and at least one of the other battery modules has a temperature change trend that is not an upward trend within a first historical time period, for each first battery module The block performs the following operations, where any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend: based on the actual current value, the total resistance value and the first cooling temperature difference of the first battery cell module, the liquid immersion height of the first battery cell module is determined, and the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature; the valve of the first battery cell module is opened, and when the liquid level sensor in the first battery cell module monitors that the coolant level reaches the liquid immersion height, the valve opening is reduced to keep the first battery cell module immersed in the coolant at the liquid immersion height.

[0086] In the embodiment of the present application, the liquid immersion height of the first battery cell module is determined based on the actual current value, the total resistance value and the first cooling temperature difference of the first battery cell module, wherein the first cooling temperature difference is the difference between the upper limit of the module operating temperature and the ambient temperature; so that only a liquid sensor needs to be added to the battery cell module to associate the coolant level height in the battery cell module with the actual temperature of the telecommunications module, thereby adjusting the coolant flow by controlling the valve of the battery cell module, and then achieving precise temperature control of the battery cell module.

[0087] The preferred implementation modes of the present application are further described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application, and the embodiments of the present application and the features in the embodiments may be combined with each other if there is no conflict.

[0088] Figure 1 Schematic diagram of the structure of electronic devices in some embodiments of the present application. Figure 1 As shown, the electronic device 10 includes a cabinet 100, and the cabinet 100 includes a lithium battery 101, a liquid storage tank 102, and a control device 103.

[0089] The lithium battery 101 includes a plurality of battery modules arranged in a stacked structure, wherein a temperature sensor for monitoring the actual temperature of the battery modules is arranged in every two battery modules, and a liquid level sensor for monitoring the liquid immersion height of the coolant is arranged in each battery module;

[0090] A liquid storage tank 102, used to store coolant, which is used to control the temperature of a plurality of battery modules;

[0091] The control device 103 is used to execute the liquid temperature control method of the lithium battery in some embodiments of the present application to achieve precise temperature control of a plurality of battery cell modules.

[0092] In some embodiments, the liquid storage tank is mostly arranged at the lower part of the cabinet, and is equipped with a liquid pump for conveying the cooling liquid. Figure 2 The control device controls the input and output of electricity. The battery modules are placed in the cabinet in a stacked manner. The liquid storage tank is connected to each battery module through a liquid pump and a pipeline, and is provided with a valve, such as a solenoid valve. After the battery module cools down, the coolant circulates back to the liquid storage tank from the return pipe, such as Figure 2 shown.

[0093] In some embodiments of the present application, a temperature sensor is provided between every two battery cell modules. When thermal runaway occurs in a battery cell module, the high temperature signal may trigger the start of the liquid temperature control program. The temperature control liquid is driven into the battery cell module by a liquid pump to immerse the battery cell and control the temperature.

[0094] See also Figure 3 As shown, the embodiment of the present application provides a liquid temperature control method for a lithium battery, and the specific process of the method includes but is not limited to the following:

[0095] Step 100: monitoring the actual temperature of each battery cell module through a temperature sensor between every two battery cell modules;

[0096] Step 110: When it is monitored that the actual temperature of any battery cell module is in the first temperature range, and at least one of the other battery cell modules has a temperature change trend that is not an upward trend within the first historical time period, the following operation is performed for each first battery cell module, where any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend:

[0097] Step 1101: determining the liquid immersion height of any first battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference of any first battery cell module, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature;

[0098] Step 1102: Open the valve of any of the first battery cell modules, and when the liquid level sensor in any of the first battery cell modules detects that the coolant level reaches the liquid immersion height, reduce the opening of the valve to keep any of the first battery cell modules immersed in the coolant at the liquid immersion height.

[0099] Involving step 100, in some embodiments of the present application, the temperature between the battery cell modules can be collected through a temperature sensor between every two battery cell modules, so that based on the collected temperature, the actual temperature of each battery cell module can be known, thereby realizing temperature monitoring of the battery cell modules.

[0100] Involving step 110, in some embodiments of the present application, the temperature of the battery cell module can be divided into different intervals in advance. In practical applications, the optimal operating temperature of the battery cell module is generally between 20 and 35°C, which is recorded as the second temperature interval. When the monitored temperature in the battery cell module is set to be between 40 and 50°C (recorded as the first temperature interval), the liquid temperature control strategy in the present application is activated; further, when the monitored temperature continues to rise to above 50°C (recorded as the temperature threshold), the liquid fire fighting strategy in the present application is activated. In this way, the conversion between the above two strategies can be achieved by monitoring the actual temperature of the battery cell module, and a liquid level sensor, such as a float-type liquid level sensor, can be added to the battery cell module to monitor the liquid level of the coolant in the battery cell module.

[0101] It should be noted that, due to the different temperatures in different geographical locations, the specific temperatures in the first temperature range and the second temperature range are not specifically limited and can be specifically set based on actual conditions.

[0102] In some embodiments, after obtaining the actual temperature of each battery cell module, the actual temperature is compared with the first temperature range to determine whether it is within the first temperature range. If, after monitoring that the actual temperature of any battery cell module is within the first temperature range, based on the temperature data of other modules monitored, the temperature change trend within the first historical time period before the current moment, such as the 5 historical temperature data before the current moment, is determined, and then, it is determined whether the temperature change trend is an upward trend.

[0103] If it is determined that at least one battery cell module among the other battery cell modules has a temperature change trend that is not an upward trend within the first historical time period, the liquid immersion height of the first battery cell module (i.e., the heat-generating battery cell module) is determined based on the actual current value, the total resistance value and the first cooling temperature difference of the first battery cell module, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature; then, the valve of each first battery cell module is opened, and the coolant level is monitored by respective liquid level sensors, and when it is detected that the coolant level reaches the corresponding liquid immersion height, the valve opening is reduced to keep the corresponding battery cell module immersed in the coolant at the liquid immersion height, so as to realize a small flow circulation of the coolant and achieve a temperature control effect.

[0104] Following the above example, the upper limit value of the module operating temperature may be the upper limit value of the second temperature interval, that is, 35°C.

[0105] In some embodiments of the present application, the liquid immersion height of any battery module can be expressed by the following formula, which is recorded as H for the sake of distinction. a :

[0106]

[0107] Among them, in the above formula, I a represents the actual current value of the battery module, that is, the actual output current; r represents the total resistance value of the battery module, that is, the total internal resistance; C p is the specific heat capacity of the coolant, usually a constant; Δt a represents the first cooling temperature difference, i.e. the temperature difference before and after cooling of the coolant, where Δt a =t best (module operating temperature upper limit) - t0 (ambient temperature).

[0108] In some embodiments of the present application, if it is monitored that the actual temperature of any of the battery cell modules is in the first temperature range, and the temperature change trends of other battery cell modules in the first historical time period are all upward trends, it means that all the battery cell modules in the electronic device are in a heating state and there is a temperature rising trend. At this time, in order to ensure that there is a small flow circulation in the temperature control system of the electronic device, a lower limit value of the mass of the coolant circulation can be set at this time. Then, based on the total mass of the coolant that can be stored in the liquid storage tank in the electronic device, the total number of battery cell modules included in the lithium battery, the coolant density and the bottom area of ​​each battery cell module, and the lower limit value of the mass, the minimum liquid immersion height of each battery cell module can be determined and recorded as the reference immersion height.

[0109] In some embodiments of the present application, assuming that the specifications of each battery module are consistent, the lower limit of the mass of the coolant circulation can be set to the mass of the coolant at the minimum liquid immersion height of the battery module. At this time, the above-mentioned reference immersion height H can be expressed by the following formula: min :

[0110]

[0111] Among them, in the above formula, M represents the total mass of the coolant; n represents the total number of a plurality of battery modules; A represents the bottom area of ​​the battery module. Usually, the specifications of the battery modules in a device are consistent. When there are battery modules with inconsistent specifications, the above formula can be adjusted based on the specifications of the actual battery modules; ρ represents the coolant density of the coolant.

[0112] Then, in some embodiments of the present application, if it is monitored that the actual temperature of any one of the battery cell modules is in the first temperature range, and the temperature change trends of other battery cell modules in the first historical time period are all upward trends, then the liquid immersion height of any one of the first battery cell modules is a reference immersion height, wherein the reference immersion height is based on the total mass of the coolant that can be stored in the liquid storage tank in the electronic device, the total number of the multiple battery cell modules, the coolant density and the bottom area of ​​each battery cell module, and the lower limit value of the mass of the coolant circulation.

[0113] By opening the valve, the coolant will flow into each battery cell module driven by the liquid pump, so that the battery cell module can be immersed in the coolant to achieve the temperature control effect.

[0114] In some embodiments, after the coolant level of any of the first battery cell modules stabilizes at the liquid immersion height, refer to Figure 4 As shown, you can also perform the following steps:

[0115] Step 400: Continuously monitor the actual temperature of any one of the first battery cell modules;

[0116] Step 410: If it is determined that the temperature change trend of any first battery cell module in the first time period is a downward trend, the opening of the valve is kept unchanged;

[0117] Step 420: If it is determined that the temperature change trend of any one of the first battery cell modules within the first time period is an upward trend, the liquid immersion height of any one of the first battery cell modules is updated based on the liquid immersion height and the reference immersion height, and based on the updated liquid immersion height, the valve opening of any one of the first battery cell modules is adjusted to keep any one of the first battery cell modules immersed in the coolant at the updated liquid immersion height.

[0118] In step 400, the actual temperature of the heating cell module can continue to be monitored by the temperature sensor of the heating cell module. In some embodiments, the temperature change trend of the heating cell module can be determined based on the first time period after the liquid level is stabilized, such as 5 temperature data, and whether the temperature change trend is an upward trend or a downward trend, and directional adjustment can be performed based on the specific change trend.

[0119] In step 410, when it is determined that the temperature change trend of the heating cell module in the first time period is a downward trend, it indicates that the current liquid immersion height H a The coolant is effective in reducing the temperature of the battery module. Then, the current working state can be maintained, that is, the opening of the valve is kept unchanged to keep the heating battery module at a liquid immersion height of H. a of coolant.

[0120] In step 420, when it is determined that the temperature change trend of the heating cell module in the first time period is an upward trend, it indicates that the current liquid immersion height H a The coolant is not effective in reducing the temperature of the battery module, and the amount of coolant needs to be increased. Then, the liquid immersion height H can be a and reference immersion height H min , update the liquid immersion height of the heating cell module, recorded as H b .

[0121] In some embodiments of the present application, the updated liquid immersion height H can be expressed by the following formula: b :

[0122] H b =H a +H min

[0123] Then, based on the updated liquid immersion height, the valve of the heating cell module is increased to allow more coolant to flow into the heating cell module, and the coolant level is monitored by a liquid level sensor in the heating cell module. After monitoring that the liquid level reaches the updated liquid immersion height, the valve opening of the heating cell module is decreased to keep the heating cell module immersed in the coolant at the updated liquid immersion height.

[0124] Continue to monitor the actual temperature of each heating cell module. If the actual temperature of any first cell module is restored to the second temperature range after cooling and temperature control, close the valve so that the coolant in the cell module will flow back to the liquid storage tank; wherein the upper limit value of the second temperature range is less than the lower limit value of the first temperature range.

[0125] In some embodiments, after the above temperature control process, the actual temperature of some battery modules may still rise, or the actual temperature of a battery module may rise suddenly. Figure 5 As shown, temperature control can be achieved by performing the following steps: Figure 5 The process shown corresponds to the aforementioned liquid fire fighting strategy:

[0126] Step 500: When it is monitored that the actual temperature of any battery cell module reaches a temperature threshold, controlling the valve of any battery cell module to be at the maximum opening, and the temperature threshold is greater than the upper limit of the first temperature interval;

[0127] Step 510: if it is determined that there are a plurality of other battery cell modules whose temperature change trend in the second historical time period is an upward trend, then based on the temperature data of the plurality of other battery cell modules in the second historical time period, screen out other battery cell modules whose rising rate exceeds the average rising rate from the plurality of other battery cell modules;

[0128] Step 520: determining the liquid immersion height of each of the other battery cell modules based on the actual current value, the total resistance value and the second cooling temperature difference of each of the other battery cell modules, wherein the second cooling temperature difference is the difference between the lower limit value of the first temperature range and the ambient temperature;

[0129] Step 530: adjusting respective valves based on the liquid immersion heights of the other battery cell modules, so that the other battery cell modules are immersed in the coolant at their respective liquid immersion heights.

[0130] Regarding step 500, in some embodiments of the present application, the temperature threshold can be set to the upper limit value of the aforementioned first temperature range, or the temperature threshold for starting the liquid fire fighting strategy can be specifically set according to actual needs.

[0131] In some embodiments, when the actual temperature of any battery cell module monitored by the temperature sensor reaches the temperature threshold, it indicates that there is a great risk of thermal runaway in the temperature of the heating battery cell module. At this time, the valve of the heating battery cell module is controlled to the maximum opening, so that the coolant can flow into the heating battery cell module as quickly as possible to reduce the temperature of the heating battery cell module.

[0132] At the same time, the temperature conditions of other battery cell modules can be determined, that is, the temperature data of other battery cell modules in the second historical time period are obtained, and based on the obtained temperature data, the temperature change trend of other battery cell modules in the second historical time period is determined, wherein the second historical time period can be the time from when the valve of the heating battery cell module that controls the actual temperature to reach the temperature threshold is at the maximum opening to the previous 5 historical temperature data, and can also be specifically set based on actual needs.

[0133] Involving step 510, in some embodiments, if it is determined that there are multiple other battery cell modules whose temperature change trend in the second historical time period is an upward trend, a linear function model of the rising temperature data is established based on the temperature data of the multiple other battery cell modules in the second historical time period, so as to obtain the rising rate of the aforementioned multiple other battery cell modules; considering that the coolant is limited, at this time, the temperature of other battery cell modules with a larger rising rate is preferentially controlled.

[0134] In a possible implementation, the average rising rate of each rising rate can be obtained, and then, from multiple other battery cell modules, other battery cell modules with a rising rate greater than the average rising rate are selected, and the selected other battery cell modules are preferentially subjected to temperature control.

[0135] In step 520, the following operations are performed for each selected other battery cell module: based on the actual current value, the total resistance value and the second cooling temperature difference of the target other battery cell module, the liquid immersion height of the target other battery cell module is determined, which is recorded as H c .

[0136] In some embodiments of the present application, H can be expressed by the following formula: c :

[0137]

[0138] Among them, in the above formula, I c Indicates the actual current value of the battery module, that is, the output current value at this moment; Δt c Indicates the second cooling temperature difference, that is, the temperature difference before and after cooling of the coolant, Δt c =t(lower limit value of the first temperature interval)-t0'(ambient temperature).

[0139] It should be noted that the ambient temperature in some embodiments of the present application can be obtained by sending it from a monitoring system that has a communication connection with the electronic device, or by setting up a sensor to collect it, and the present application does not make any specific limitations.

[0140] Involving step 530, after obtaining the liquid immersion height of each of the other battery cell modules mentioned above, based on the respective liquid immersion heights, the respective valves are adjusted, that is, if they are not opened, they are opened, if the opening is small, they are adjusted to a larger size, etc., so that the coolant can flow into each of the other battery cell modules under the drive of the liquid pump, so that each of the other battery cell modules is immersed in the coolant at the respective liquid immersion heights.

[0141] In some embodiments, after the liquid level of each of the heating cell modules (i.e., any of the aforementioned cell modules and the aforementioned other cell modules) is stabilized, refer to Figure 6 As shown, you can also perform the following steps:

[0142] Step 600: Continuously monitor the actual temperature of any one of the battery cell modules and each of the other battery cell modules.

[0143] In some embodiments of the present application, when executing step 600, the aforementioned heating cell modules are continuously monitored by a temperature sensor, and the temperature change trend of each heating cell module in the second time period is determined, and the temperature is controlled based on the temperature change trend.

[0144] Step 610: If it is determined that there is a second battery cell module in any of the battery cell modules and the other battery cell modules, and the temperature change trend within the second time period is a downward trend, then after determining that the actual temperature of the second battery cell module has returned to the second temperature range, the valve of the second battery cell module is closed, and the upper limit value of the second temperature range is less than the lower limit value of the first temperature range.

[0145] In some embodiments of the present application, through the above processing, the actual temperature of some battery cell modules can be restored to the second temperature range, and these battery cell modules are recorded as second battery cell modules. Then, step 610 is executed to close the valve of the second battery cell module.

[0146] Step 620: If it is determined that there is a third battery cell module in any of the battery cell modules and the other battery cell modules, and the temperature change trend in the second time period is an upward trend, a high temperature alarm signal for the third battery cell module is issued.

[0147] In some embodiments of the present application, after the above processing, some battery cell modules may still not achieve the expected temperature control effect. These battery cell modules can be recorded as third battery cell modules. Then, step 620 is executed to output a high temperature alarm signal to prompt personnel to handle it.

[0148] In other embodiments, after screening out the other cell modules whose rising rates exceed the average rising rate, for the other cell modules whose rising rates do not exceed the average rising rate, that is, each other cell module in the plurality of other cell modules except the aforementioned other cell modules, refer to Figure 7 As shown, the following steps can be performed:

[0149] Step 700: Determine the respective liquid immersion heights of each other battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference;

[0150] Step 710: Determine respective target immersion heights based on the determined liquid immersion height and the reference immersion height, and adjust corresponding valves based on the respective target immersion heights so that each other battery cell module is immersed in the coolant at the respective corresponding target immersion height.

[0151] In some embodiments, after controlling the valve of any cell module to be at the maximum opening, referring to Figure 8 As shown, further precise temperature control can be achieved by performing the following steps:

[0152] Step 800: If it is determined that the temperature change trend of any other battery cell module in the second historical time period is a downward trend, then based on the actual current value, the total resistance value and the first cooling temperature difference of the other battery cell module, the liquid immersion height of the other battery cell module is determined;

[0153] Step 810: Based on the determined liquid immersion height, adjust the valve of the other battery cell module to immerse the other battery cell module in the coolant at the corresponding liquid immersion height.

[0154] In some embodiments, continuous temperature monitoring is performed on each battery cell module in temperature control. If the temperature is monitored to recover to the second temperature range, the valve of the battery cell module is closed. If the temperature is monitored not to recover to the second temperature range, the current operating state is maintained unchanged to reduce the temperature of the battery cell module, thereby avoiding the risk of thermal runaway.

[0155] In the present application, a coolant distribution strategy is proposed by controlling the height of the coolant level in the battery cell module and controlling the amount of coolant entering the battery cell module, which is divided into the aforementioned liquid temperature control strategy and liquid fire fighting strategy. Among them, the liquid temperature control strategy aims to control the temperature with the cooling capacity of the coolant that matches the heating value of the battery cell, and the liquid fire fighting strategy aims to use limited coolant to slow down the temperature rise rate of the battery cell and extend the time for maintenance personnel to arrive on site. The above strategy can maximize the use of limited coolant cooling capacity, especially when multiple battery cell modules generate heat, and the coolant can be allocated according to the severity of the high temperature of the battery cell modules, effectively avoiding overheating of a battery cell module and affecting the operation of other modules. Furthermore, even in extreme cases, the above strategy can achieve a certain temperature control effect, delay the occurrence of thermal runaway of the battery cell module, and buy time for maintenance personnel to arrive on site for repairs.

[0156] The following is an example of a battery cell module to illustrate the process of the liquid temperature control strategy. Fig. 9 This is a schematic diagram of the overall process of a liquid temperature control strategy in some embodiments of the present application. Fig. 9 The specific process may include but is not limited to the following:

[0157] Step 901: It is detected that the temperature of a battery cell module reaches a set threshold.

[0158] In some embodiments of the present application, assuming that the optimal operating temperature (second temperature range) of the battery module is 20-35°C; the first temperature range is [40, 50)°C, then the threshold value may be set to 40°C.

[0159] Step 902: Obtain 5 historical temperature data of other modules.

[0160] Step 903: Determine whether the module temperature is on an upward trend; if so, execute step 905; if not, execute step 904.

[0161] It should be noted that, when executing step 903 , it is determined separately whether the temperature change trend of each other module is an upward trend.

[0162] Step 904: Turn on the liquid pump and the solenoid valve of this module.

[0163] Step 905: Turn on the liquid pump, the module and the solenoid valve of the temperature rising module.

[0164] Step 906: Determine whether the temperature of all modules is on an upward trend. If so, execute step 907; if not, execute step 908.

[0165] Step 907: Maintain the liquid level at H min .

[0166] In some embodiments of the present application, the H can be determined by the aforementioned method. min , I will not go into details here.

[0167] Step 908: Maintain the liquid level of the heating module at H a .

[0168] In some embodiments of the present application, the H can be determined by the aforementioned method. a , I will not go into details here.

[0169] Step 909: Determine whether the next five temperature data of the heating module show an upward trend. If so, execute step 910; if not, execute step 911.

[0170] Step 910: Maintain the liquid level at H b , and further execute step 911.

[0171] In some embodiments of the present application, the H can be determined by the aforementioned method. b , I will not go into details here.

[0172] Step 911: Determine whether the module temperature has returned to a normal value (second temperature range). If so, execute step 912; if not, return to execute step 903.

[0173] Step 912: Close the module solenoid valve.

[0174] The following uses a battery cell module as an example to illustrate the process of the liquid fire protection strategy. Fig.10This is a schematic diagram of the overall process of a liquid fire fighting strategy in some embodiments of the present application. Fig.10 The specific process may include but is not limited to the following:

[0175] Step 1001: It is detected that the temperature of a battery cell module reaches 50°C.

[0176] Step 1002: Fully open the module solenoid valve.

[0177] Step 1003: Monitor the historical 5 temperature data of other modules before the current time.

[0178] Step 1004: Determine whether the module temperature is on an upward trend, if so, execute step 1006, if not, execute step 1005.

[0179] Similar to step 903 , it is determined whether the temperature change trend of each other module is an upward trend.

[0180] Step 1005: Maintain the liquid level of the module at H a , further execute step 1012.

[0181] Step 1006: Establish a linear function model for the rising temperature data to obtain k i and K.

[0182] Among them, k i is the rising rate of the heating module with serial number i, and K is the average rising rate.

[0183] Step 1007: Determine whether k i >K, if yes, execute step 1009; if no, execute step 1008.

[0184] It should be noted that it is determined in turn whether the rising rate of each other module monitored in step 1003 is greater than the average rising rate, and step 1008 is executed for each other module whose rising rate is greater than the average rising rate.

[0185] Step 1008: Maintain the module liquid level at H b , further execute step 1012.

[0186] In some embodiments of the present application, the H can be determined by the aforementioned method. b , I will not go into details here.

[0187] Step 1009: Update the module liquid level to H c .

[0188] In some embodiments of the present application, the H can be determined by the aforementioned method. c , I will not go into details here.

[0189] Step 1010: Determine whether the five temperature data after the heating module show an upward trend. If so, execute step 1011; if not, execute arrangement 1012.

[0190] Step 1011: Send a high temperature alarm signal.

[0191] Step 1012: Determine whether the module temperature returns to a normal value (ie, within the second temperature range). If so, execute step 1013; if not, execute step 1014.

[0192] Step 1013: Close the solenoid valve of the module.

[0193] Step 1014: Keep the heating module in working state and further execute step 1012.

[0194] In some embodiments of the present application, in step 1014, the current working state of the heating module is maintained, that is, the corresponding liquid level height is maintained.

[0195] See also Fig. 9 and Fig.10 In the process shown, different temperature control methods can be adopted in this application according to the real-time operation of the battery module. When it is found that the adopted temperature control strategy still cannot effectively control the battery temperature, a more powerful strategy will be adopted to control the temperature again. Compared with the simple full circulation method of coolant in the traditional sense, the strategy adopted in some embodiments of this application can cope with battery modules under different heating conditions and continuously adjust to achieve the purpose of temperature control.

[0196] Based on the same inventive concept, refer to Fig.11 As shown, in an embodiment of the present application, a liquid temperature control device for a lithium battery is provided, which is applied to an electronic device powered by a lithium battery, wherein the lithium battery comprises a plurality of battery cell modules arranged in a stacked structure, and the device comprises:

[0197] A monitoring module 1110 is used to monitor the actual temperature of each battery cell module through a temperature sensor between every two battery cell modules;

[0198] The temperature control module 1120 is used to perform the following operations for each first battery cell module when it is monitored that the actual temperature of any battery cell module is in the first temperature range and at least one of the other battery cell modules has a temperature change trend that is not an upward trend within the first historical time period. Any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend:

[0199] Determine the liquid immersion height of any of the first battery cell modules based on the actual current value, the total resistance value and the first cooling temperature difference of any of the first battery cell modules, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature;

[0200] Open the valve of any of the first battery cell modules, and when the coolant level detects through the liquid level sensor in any of the first battery cell modules that the coolant level reaches the liquid immersion height, reduce the opening of the valve to keep any of the first battery cell modules immersed in the coolant at the liquid immersion height.

[0201] In a possible implementation, if it is monitored that the actual temperature of any one of the battery cell modules is within the first temperature range, and the temperature change trends of other battery cell modules within the first historical time period are all upward trends, then the liquid immersion height of any one of the first battery cell modules is a reference immersion height, and the reference immersion height is based on the total mass of the coolant that can be stored in the liquid storage tank in the electronic device, the total number of the battery cell modules, the coolant density and the bottom area of ​​each battery cell module, and the lower limit value of the mass of the coolant circulation.

[0202] In a possible implementation manner, after the coolant level of any of the first battery cell modules is stabilized at the liquid immersion height, the temperature control module 1120 is further configured to:

[0203] Continuously monitoring the actual temperature of any one of the first battery cell modules;

[0204] If it is determined that the temperature change trend of any of the first battery cell modules within the first time period is a downward trend, keeping the opening of the valve unchanged;

[0205] If it is determined that the temperature change trend of any one of the first battery cell modules within the first time period is an upward trend, the liquid immersion height of any one of the first battery cell modules is updated based on the liquid immersion height and the reference immersion height, and based on the updated liquid immersion height, the valve opening of any one of the first battery cell modules is adjusted to keep any one of the first battery cell modules immersed in the coolant at the updated liquid immersion height.

[0206] In a possible implementation, the temperature control module 1120 is further used for:

[0207] If the actual temperature of any first battery cell module is restored to the second temperature range after cooling and temperature control, the valve is closed, and the upper limit value of the second temperature range is less than the lower limit value of the first temperature range.

[0208] In a possible implementation, the temperature control module 1120 is further used for:

[0209] When it is monitored that the actual temperature of any battery cell module reaches a temperature threshold, controlling the valve of any battery cell module to be at the maximum opening, and the temperature threshold is greater than the upper limit value of the first temperature interval;

[0210] If it is determined that there are a plurality of other battery cell modules whose temperature change trends in the second historical time period are rising trends, then based on the temperature data of the plurality of other battery cell modules in the second historical time period, screen out other battery cell modules whose rising rates exceed the average rising rate from the plurality of other battery cell modules;

[0211] Determining the liquid immersion height of each of the other battery cell modules based on the actual current value, the total resistance value and the second cooling temperature difference of each of the other battery cell modules, respectively, wherein the second cooling temperature difference is the difference between the lower limit value of the first temperature range and the ambient temperature;

[0212] Based on the liquid immersion heights of the other battery cell modules, the respective valves are adjusted to allow the other battery cell modules to be immersed in the coolant at the respective liquid immersion heights.

[0213] In a possible implementation, the temperature control module 1120 is further used for:

[0214] Continuously monitoring the actual temperature of any one of the battery cell modules and each of the other battery cell modules;

[0215] If it is determined that there is a second battery cell module in any of the battery cell modules and each of the other battery cell modules, and the temperature change trend in the second time period is a downward trend, then after determining that the actual temperature of the second battery cell module has recovered to the second temperature interval, the valve of the second battery cell module is closed, and the upper limit value of the second temperature interval is less than the lower limit value of the first temperature interval;

[0216] If it is determined that there is a third battery cell module in any of the battery cell modules and the other battery cell modules, the temperature change trend of which is an upward trend in the second time period, a high temperature alarm signal for the third battery cell module is issued.

[0217] In a possible implementation manner, after controlling the valve of any battery cell module to be at the maximum opening, the temperature control module 1120 is further used to:

[0218] If it is determined that the temperature change trend of any other battery cell module in the second historical time period is a downward trend, determining the liquid immersion height of any other battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference of any other battery cell module;

[0219] Based on the determined liquid immersion height, adjusting the valve of any other battery cell module so that any other battery cell module is immersed in the coolant at the corresponding liquid immersion height;

[0220] After screening out other battery cell modules whose rising rates exceed the average rising rate, the temperature control module 1120 is further used to:

[0221] Determine the respective liquid immersion heights based on the actual current value, the total resistance value and the first cooling temperature difference of each other battery cell module;

[0222] Based on the determined liquid immersion height and the reference immersion height, respective target immersion heights are determined, and based on the respective target immersion heights, corresponding valves are adjusted so that each other battery cell module is immersed in the coolant at the respective corresponding target immersion height.

[0223] See also Fig.12 As shown, an electronic device is provided in an embodiment of the present application, and the electronic device can implement the functions of the aforementioned method, referring to Fig.12 , the electronic equipment comprises: a cabinet;

[0224] The cabinet includes a lithium battery, a liquid storage tank, and a control device;

[0225] The lithium battery comprises a plurality of battery modules arranged in a stacked structure, wherein a temperature sensor for monitoring the actual temperature of the battery modules is arranged in every two battery modules, and a liquid level sensor for monitoring the liquid immersion height of the coolant is arranged in each battery module;

[0226] The liquid storage tank is used to store coolant, and the coolant is used to control the temperature of the plurality of battery modules;

[0227] The control device includes at least one processor 121 and a memory 122 connected to the at least one processor 121. The specific connection medium between the processor 121 and the memory 122 is not limited in the embodiment of the present application. Fig.12 In the example, the processor 121 and the memory 122 are connected via the bus 120. The bus 120 is Fig.12 The connection between other components is shown by bold lines, and is not intended to be limiting. The bus 120 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.12 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. Alternatively, the processor 121 can also be called a controller, and there is no limitation on the name.

[0228] In the embodiment of the present application, the memory 122 stores instructions that can be executed by at least one processor 121. The at least one processor 121 can perform the method discussed above by executing the instructions stored in the memory 122. The processor 121 can implement the functions of the aforementioned device.

[0229] In a possible implementation, the processor 121 may include one or more processing units, and the processor 121 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the modem processor may not be integrated into the processor 121. In some embodiments, the processor 121 and the memory 122 may be implemented on the same chip, and in some embodiments, they may also be implemented separately on separate chips.

[0230] The processor 121 may be a general-purpose processor, for example, a central processing unit (CPU), a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0231] The memory 122 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The memory 122 may include at least one type of storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory, a random access memory (Random Access Memory, RAM), a static random access memory (Static Random Access Memory, SRAM), a programmable read-only memory (Programmable Read Only Memory, PROM), a read-only memory (Read Only Memory, ROM), an electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a magnetic memory, a disk, an optical disk, etc. The memory 122 is any other medium that can be used to carry or store a desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory 122 in the embodiment of the present application can also be a circuit or any other device that can realize a storage function, for storing program instructions and / or data.

[0232] By designing and programming the processor 121, the code corresponding to the method described in the above embodiment can be fixed into the chip, so that the chip can execute the steps of the method of the above embodiment when running. How to design and program the processor 121 is a technology well known to those skilled in the art and will not be described in detail here.

[0233] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium. When instructions in the storage medium are executed by a processor, the processor is enabled to execute any one of the methods in the above embodiments.

[0234] In some possible implementations, various aspects of the method provided in the present application may also be implemented in the form of a program product, which includes program code. When the program product is run on a device, the program code is used to enable the device to execute the steps of the method according to various exemplary implementations of the present application described above in this specification.

[0235] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0236] The present application is described with reference to the flowchart and / or block diagram of the method, device (system), and computer program product according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the process and / or box in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one process or multiple processes in the flowchart and / or one box or multiple boxes in the block diagram.

[0237] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0238] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0239] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for controlling the temperature of a lithium battery liquid, characterized in that: Applied to an electronic device powered by a lithium battery, the lithium battery comprising a plurality of battery cell modules arranged in a stacked structure, the method comprising: The actual temperature of each battery cell module is monitored by a temperature sensor between every two battery cell modules; When it is monitored that the actual temperature of any battery cell module is in the first temperature range, and at least one of the other battery cell modules has a temperature change trend that is not an upward trend within the first historical time period, the following operation is performed for each first battery cell module, where any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend: Determine the liquid immersion height of any of the first battery cell modules based on the actual current value, the total resistance value and the first cooling temperature difference of any of the first battery cell modules, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature; Open the valve of any of the first battery cell modules, and when the coolant level detects through the liquid level sensor in any of the first battery cell modules that the coolant level reaches the liquid immersion height, reduce the opening of the valve to keep any of the first battery cell modules immersed in the coolant at the liquid immersion height.

2. The method according to claim 1, characterized in that If it is monitored that the actual temperature of any of the battery cell modules is within the first temperature range, and the temperature change trends of other battery cell modules within the first historical time period are all upward trends, then the liquid immersion height of any of the first battery cell modules is a reference immersion height, and the reference immersion height is based on the total mass of the coolant that can be stored in the liquid storage tank in the electronic device, the total number of the battery cell modules, the coolant density and the bottom area of ​​each battery cell module, and the lower limit value of the mass of the coolant circulation.

3. The method according to claim 1, characterized in that After the coolant level of any one of the first battery cell modules is stabilized at the liquid immersion height, the method further includes: Continuously monitoring the actual temperature of any one of the first battery cell modules; If it is determined that the temperature change trend of any of the first battery cell modules within the first time period is a downward trend, keeping the opening of the valve unchanged; If it is determined that the temperature change trend of any one of the first battery cell modules within the first time period is an upward trend, the liquid immersion height of any one of the first battery cell modules is updated based on the liquid immersion height and the reference immersion height, and based on the updated liquid immersion height, the valve opening of any one of the first battery cell modules is adjusted to keep any one of the first battery cell modules immersed in the coolant at the updated liquid immersion height.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: If the actual temperature of any first battery cell module is restored to the second temperature range after cooling and temperature control, the valve is closed, and the upper limit value of the second temperature range is less than the lower limit value of the first temperature range.

5. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: When it is monitored that the actual temperature of any battery cell module reaches a temperature threshold, controlling the valve of any battery cell module to be at the maximum opening, and the temperature threshold is greater than the upper limit value of the first temperature interval; If it is determined that there are a plurality of other battery cell modules whose temperature change trends in the second historical time period are rising trends, then based on the temperature data of the plurality of other battery cell modules in the second historical time period, screen out other battery cell modules whose rising rates exceed the average rising rate from the plurality of other battery cell modules; Determining the liquid immersion height of each of the other battery cell modules based on the actual current value, the total resistance value and the second cooling temperature difference of each of the other battery cell modules, respectively, wherein the second cooling temperature difference is the difference between the lower limit value of the first temperature range and the ambient temperature; Based on the liquid immersion heights of the other battery cell modules, the respective valves are adjusted to allow the other battery cell modules to be immersed in the coolant at the respective liquid immersion heights.

6. The method according to claim 5, characterized in that The method further comprises: Continuously monitoring the actual temperature of any one of the battery cell modules and each of the other battery cell modules; If it is determined that there is a second battery cell module in any of the battery cell modules and each of the other battery cell modules, and the temperature change trend in the second time period is a downward trend, then after determining that the actual temperature of the second battery cell module has recovered to the second temperature interval, the valve of the second battery cell module is closed, and the upper limit value of the second temperature interval is less than the lower limit value of the first temperature interval; If it is determined that there is a third battery cell module in any of the battery cell modules and the other battery cell modules, the temperature change trend of which is an upward trend in the second time period, a high temperature alarm signal for the third battery cell module is issued.

7. The method according to claim 5, characterized in that After controlling the valve of any cell module to be at the maximum opening, the method further includes: If it is determined that the temperature change trend of any other battery cell module in the second historical time period is a downward trend, determining the liquid immersion height of any other battery cell module based on the actual current value, the total resistance value and the first cooling temperature difference of any other battery cell module; Based on the determined liquid immersion height, adjusting the valve of any other battery cell module so that any other battery cell module is immersed in the coolant at the corresponding liquid immersion height; After screening out other battery cell modules whose rising rates exceed the average rising rate, the method further includes: Determine the respective liquid immersion heights based on the actual current value, the total resistance value and the first cooling temperature difference of each other battery cell module; Based on the determined liquid immersion height and the reference immersion height, respective target immersion heights are determined, and based on the respective target immersion heights, corresponding valves are adjusted so that each other battery cell module is immersed in the coolant at the respective corresponding target immersion height.

8. A liquid temperature control device for a lithium battery, characterized in that: Applicable to electronic equipment powered by a lithium battery, wherein the lithium battery comprises a plurality of battery modules arranged in a stacked structure, the device comprises: A monitoring module, used to monitor the actual temperature of each battery cell module through a temperature sensor between every two battery cell modules; The temperature control module is used to perform the following operations for each first battery cell module when it is monitored that the actual temperature of any battery cell module is in the first temperature range and the temperature change trend of at least one battery cell module among the other battery cell modules in the first historical time period is not an upward trend. Any first battery cell module is any of the battery cell modules, or any other battery cell module whose temperature change trend is an upward trend: Determine the liquid immersion height of any of the first battery cell modules based on the actual current value, the total resistance value and the first cooling temperature difference of any of the first battery cell modules, wherein the first cooling temperature difference is the difference between the upper limit value of the module operating temperature and the ambient temperature; Open the valve of any of the first battery cell modules, and when the coolant level detects through the liquid level sensor in any of the first battery cell modules that the coolant level reaches the liquid immersion height, reduce the opening of the valve to keep any of the first battery cell modules immersed in the coolant at the liquid immersion height.

9. An electronic device, characterized in that: include: Cabinet; The cabinet includes a lithium battery, a liquid storage tank, and a control device; The lithium battery comprises a plurality of battery modules arranged in a stacked structure, wherein a temperature sensor for monitoring the actual temperature of the battery modules is arranged in every two battery modules, and a liquid level sensor for monitoring the liquid immersion height of the coolant is arranged in each battery module; The liquid storage tank is used to store coolant, and the coolant is used to control the temperature of the plurality of battery modules; The control device includes a memory for storing computer programs or instructions; A processor is used to execute the computer program or instructions in the memory so that the method according to any one of claims 1 to 7 is performed.

10. A computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by a processor, the processor is enabled to perform the method according to any one of claims 1 to 7.

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