Battery parallel module heat spread control method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a battery parallel module heat spreading control method, electronic equipment and a storage medium, and the method comprises the steps: carrying out the heat spreading experiment of a target battery parallel module, and recording corresponding experiment data; based on the battery characteristic parameters, the heat exchange environment parameters and the experimental data of the target battery parallel module, performing heat transfer calculation on the target battery parallel module to obtain a heat transfer calculation result; based on the experimental data and the heat transfer calculation result, determining the optimal assembly and main heat transfer mode of the target battery parallel module; and carrying out heat transfer optimization processing based on the optimal module assembly and the main heat transfer mode so as to carry out heat spread control on the target battery parallel module. According to the battery parallel module heat spread control scheme provided by the invention, the heat spread of the multi-battery parallel module can be effectively inhibited, the safety of the multi-battery parallel module is improved, the safety risk caused by thermal runaway is reduced, additional materials or devices are not needed, the complexity and size of the module are reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method for controlling heat spread of parallel battery modules, an electronic device, and a storage medium. Background Art

[0002] With the rapid development of the new energy vehicle industry, the safety of lithium-ion batteries, as its core power source, has received increasing attention. In particular, when the battery experiences thermal runaway, it is easy to cause fire and explosion, seriously threatening the safety of personnel and property. In a multi-battery parallel module, once a battery cell experiences thermal runaway, the heat may quickly spread to adjacent batteries, causing thermal runaway of the entire module or even the entire battery pack, resulting in catastrophic consequences.

[0003] In order to suppress heat spread, some existing battery module designs use expensive flame retardant and heat insulation materials, which increases the manufacturing cost of the battery module and has limited effect in practical applications; or by adding complex heat spread suppression devices, it not only increases the volume and weight of the battery module, but also affects the space utilization efficiency of the battery pack. In addition, the prior art also proposes a method of delaying heat spread by changing the arrangement of battery cells, but because the change in battery arrangement may affect the overall performance and spatial layout of the module, and it is not universal for different types of batteries. That is, the prior art has the problems of high manufacturing cost, complex design and lack of universality.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the invention

[0005] The embodiments of the present application provide a method for controlling heat spread of a battery parallel module, an electronic device, and a storage medium, which can effectively suppress the heat spread of multiple battery parallel modules, improve the safety of multiple battery parallel modules, and reduce the safety risks caused by thermal runaway. At the same time, no additional materials or devices are required, the complexity and volume of the module are reduced, and the production cost is reduced.

[0006] The embodiment of the present application provides a method for controlling heat spread of parallel battery modules, including:

[0007] Conduct heat spread experiment on target battery parallel modules and record corresponding experimental data;

[0008] Based on the battery characteristic parameters, heat exchange environment parameters and the experimental data of the target battery parallel module, heat transfer calculation is performed on the target battery parallel module to obtain a heat transfer calculation result;

[0009] Based on the experimental data and the heat transfer calculation results, determining the optimal assembly and main heat transfer mode of the target battery parallel module;

[0010] Heat transfer optimization processing is performed based on the optimal module assembly and the main heat transfer mode to control the heat spread of the target battery parallel module.

[0011] Optionally, in some embodiments of the present application, before performing a heat spread experiment on the target battery parallel module and recording corresponding experimental data, the method further includes:

[0012] Assemble and weld a preset number of batteries to obtain a target battery parallel module;

[0013] The battery characteristic parameters of the target parallel battery module and the heat exchange environment parameters of the environment where the target parallel battery module is located are obtained.

[0014] Optionally, in some embodiments of the present application, the obtaining of battery characteristic parameters of the target parallel battery module and heat exchange environment parameters of the environment where the target parallel battery module is located includes:

[0015] Obtaining the size parameters and thermal parameters of a single battery in the target battery parallel module, wherein the size parameters include height and weight, and the thermal parameters include heat generation in an adiabatic environment and specific heat capacity of the battery;

[0016] The heat exchange environment parameters of the environment where the target battery parallel module is located are obtained, wherein the heat exchange environment parameters include coolant specific heat capacity, coolant concentration, air specific heat capacity and air density.

[0017] Optionally, in some embodiments of the present application, the heat spread experiment is performed on the target battery parallel module, and the corresponding experimental data is recorded, including:

[0018] Using multiple triggering methods to trigger the target triggering battery in the target battery parallel module to conduct heat propagation experiments at different vertical pressure relief heights;

[0019] The experimental data corresponding to different vertical pressure relief heights under various triggering modes are recorded; the experimental data include the initial temperature, the vertical height of the triggering battery module assembly, and the temperature and voltage of each battery in the target battery parallel module.

[0020] Optionally, in some embodiments of the present application, the heat transfer calculation is performed on the target battery parallel module based on the battery characteristic parameters, heat exchange environment parameters and the experimental data of the target battery parallel module to obtain the heat transfer calculation result, including:

[0021] Based on the battery characteristic parameters of the target battery parallel module and the experimental data, calculating the amount of heat absorbed inside the triggering battery and the total amount of heat transferred from the triggering battery to other batteries;

[0022] Based on the battery characteristic parameters of the target battery parallel module, the heat exchange environment parameters and the experimental data, the heat transferred from the triggering battery to the air and the heat transferred from the triggering battery to the coolant are calculated.

[0023] Optionally, in some embodiments of the present application, determining the optimal assembly and main heat transfer mode of the target battery parallel module based on the experimental data and the heat transfer calculation result includes:

[0024] Based on the experimental data and the heat transfer calculation result, determining whether heat spread occurs in the target battery parallel module;

[0025] If not, increase the vertical pressure relief height of the target battery parallel module assembly, continue the heat spread test, until the target battery parallel module has heat spread, determine the maximum vertical pressure relief height of the target battery parallel module, and use the maximum vertical pressure relief height as the optimal assembly;

[0026] If so, based on the optimal assembly of the target battery parallel module and the heat transfer calculation result, the main heat transfer mode of the target battery parallel module is determined.

[0027] Optionally, in some embodiments of the present application, the heat transfer optimization process based on the optimal module assembly and the main heat transfer mode is performed to control the heat spread of the target battery parallel module, including:

[0028] Adjusting the vertical pressure relief height of the target battery parallel module based on the optimal module assembly;

[0029] The amount of coolant in the environment where the target battery parallel module is located is adjusted based on the main heat transfer mode.

[0030] Optionally, in some embodiments of the present application, after the heat transfer optimization process is performed based on the optimal module assembly and the main heat transfer mode to control the heat spread of the target battery parallel module, the method further includes:

[0031] Performing a heat spread effect evaluation on the target battery parallel module after the heat transfer optimization process to obtain an evaluation result;

[0032] Based on the evaluation results, the vertical pressure relief height of the target battery parallel module and the amount of coolant in the environment are adjusted.

[0033] Correspondingly, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for controlling thermal spread of parallel battery modules are performed as described above.

[0034] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above-mentioned methods for controlling heat spread of parallel battery modules are implemented.

[0035] The embodiment of the present application provides a method for controlling heat spread of parallel battery modules, an electronic device, and a storage medium. First, a heat spread experiment is performed on a target parallel battery module, and corresponding experimental data is recorded; then, based on the battery characteristic parameters, heat exchange environment parameters, and experimental data of the target parallel battery module, a heat transfer calculation is performed on the target parallel battery module to obtain a heat transfer calculation result; then, based on the experimental data and the heat transfer calculation result, the optimal assembly and main heat transfer mode of the target parallel battery module are determined; finally, heat transfer optimization processing is performed based on the optimal module assembly and the main heat transfer mode to control heat spread of the target parallel battery module. The battery parallel module heat spread control solution provided in the present application effectively controls and slows down heat spread, thereby improving the safety of multi-battery parallel modules in thermal runaway conditions by optimizing the vertical height assembly and heat transfer calculation of the battery modules. It does not require the use of expensive flame retardant and heat insulating materials or the addition of additional complex heat spread suppression devices, thereby reducing the complexity and volume of the modules, thereby reducing the module manufacturing cost, while improving the energy density of the battery modules. In addition, the present application can also adapt to different battery types and working environments, thereby improving the versatility of multi-battery parallel modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 It is a flow chart of a method for controlling heat spread of parallel battery modules provided in an embodiment of the present application;

[0038] Figure 2 It is another flow chart of the heat spread control method of parallel battery modules provided in the embodiment of the present application;

[0039] Figure 3 It is a schematic diagram of different triggering modes and installations of cylindrical batteries provided in the embodiments of the present application;

[0040] Figure 4 It is a schematic diagram of a specific heat transfer process of acupuncture-triggered heat spread in parallel modules provided in an embodiment of the present application;

[0041] Figure 5It is a data schematic diagram of the vertical height assembly and heat transfer calculation of the acupuncture-triggered heat spread before optimization of the parallel module provided in the embodiment of the present application;

[0042] Figure 6 It is a data schematic diagram of the vertical height assembly and heat transfer calculation of the acupuncture-triggered heat spread after the parallel module optimization provided in the embodiment of the present application;

[0043] Figure 7 It is a data schematic diagram of the vertical height assembly and heat transfer calculation of heat spread triggered by acupuncture when the amount of coolant is increased after the joint module is optimized according to the embodiment of the present application;

[0044] Figure 8 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] 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 those skilled in the art without creative work are within the scope of protection of this application.

[0046] Embodiments of the present application provide a method, device, electronic device, and storage medium for controlling heat spread of parallel battery modules.

[0047] Among them, the battery parallel module heat spread control device can be specifically integrated in a terminal, the terminal can include a tablet computer or a personal computer (PC), the terminal can establish a wired or wireless connection with a server, the server can include an independently running server or a distributed server, and can also include a server cluster consisting of multiple servers.

[0048] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0049] A method for controlling heat spread of parallel battery modules comprises: performing a heat spread experiment on a target parallel battery module and recording corresponding experimental data; performing heat transfer calculation on the target parallel battery module based on battery characteristic parameters, heat exchange environment parameters and experimental data of the target parallel battery module to obtain heat transfer calculation results; determining the optimal assembly and main heat transfer mode of the target parallel battery module based on the experimental data and the heat transfer calculation results; and performing heat transfer optimization processing based on the optimal module assembly and the main heat transfer mode to control heat spread of the target parallel battery module.

[0050] See also Figure 1 , Figure 1A schematic diagram of a flow chart of a method for controlling the heat spread of a battery parallel module provided in an embodiment of the present application. The specific flow chart of the method for controlling the heat spread of a battery parallel module may be as follows:

[0051] 101. Conduct a heat spread experiment on the target battery parallel module and record the corresponding experimental data;

[0052] Specifically, for step 101, first, a heat spread experiment is conducted on the target battery parallel module, including using a variety of triggering methods (such as acupuncture, heating, overcharging, etc.) to simulate the situation of battery thermal runaway, and record relevant experimental data. The experimental data may specifically include the initial temperature, the vertical height of the trigger battery module assembly, and the temperature and voltage changes of each battery in the module. In addition, the heat spread characteristics under different environmental conditions can also be studied so that the module can adapt to different climates and usage scenarios.

[0053] Optionally, in some embodiments, step 101 of “performing a heat spread experiment on the target battery parallel module and recording corresponding experimental data” may specifically include:

[0054] Use multiple triggering methods to trigger the target triggering battery in the target battery parallel module to conduct heat propagation experiments at different vertical pressure relief heights;

[0055] Specifically, a heat spread experiment is designed and executed to simulate extreme conditions that the battery may encounter in actual use, such as puncture, heating or overcharging, in order to trigger thermal runaway and simulate battery thermal runaway. Then, a heat spread experiment with different vertical pressure relief heights is carried out. By changing the vertical pressure relief height of the battery module in the experiment, the effects of different heights on heat spread are observed.

[0056] The experimental data corresponding to different vertical pressure relief heights under various triggering modes are recorded; the experimental data include the initial temperature, the vertical height of the triggering battery module assembly, and the temperature and voltage of each battery in the target battery parallel module.

[0057] Specifically, record the experimental data corresponding to different vertical pressure relief heights under various triggering modes, including the initial temperature, the vertical height of the battery module assembly that triggers the assembly, and the temperature and voltage of each battery in the module. For example, record the initial temperature of the battery module before the experiment as a benchmark for heat spread analysis, record the vertical height of the battery module that triggers thermal runaway to analyze its impact on heat spread, and during the experiment, record the temperature and voltage changes of each battery in the module to monitor the progress of heat spread. In addition to temperature and voltage, also record the physical state of the battery, coolant flow, etc.; analyze the collected experimental data to assess the risk of heat spread and the thermal performance of the module.

[0058] Optionally, in some embodiments, before step 101 of "performing a heat spread experiment on the target battery parallel module and recording corresponding experimental data", the battery parallel module heat spread control method further includes:

[0059] Assemble and weld a preset number of batteries to obtain a target battery parallel module;

[0060] Specifically, before conducting a heat spread experiment, a preset number of batteries must first be assembled and welded. For example, a certain number of batteries must be assembled and welded in parallel to form a target battery parallel module. This ensures that the physical structure of the module meets the design requirements, providing a basis for subsequent heat spread experiments and heat transfer calculations.

[0061] Obtaining battery characteristic parameters of the target battery parallel module and heat exchange environment parameters of the environment where the target battery parallel module is located;

[0062] Specifically, the dimensional parameters (such as height and weight) and thermal parameters (such as heat generation in an adiabatic environment and specific heat capacity of the battery) of a single battery in the target battery parallel module are obtained. These parameters are crucial to understanding the behavior of the battery in the event of thermal runaway. In addition, the heat exchange environment parameters of the environment in which the target battery parallel module is located are obtained, including coolant specific heat capacity, coolant concentration, air specific heat capacity, and air density. These parameters affect the heat exchange efficiency between the module and the environment, and are crucial for heat transfer calculations and the formulation of thermal management strategies. In the specific implementation process, sensors and Internet of Things technology can be used to monitor and obtain battery characteristic parameters and heat exchange environment parameters in real time to realize automatic data collection and analysis; a performance database of battery materials and coolant materials can be established to provide data support for subsequent design and optimization.

[0063] Optionally, in some embodiments, obtaining battery characteristic parameters of the target battery parallel module and heat exchange environment parameters of the environment where the target battery parallel module is located includes:

[0064] Obtain the size parameters and thermal parameters of a single battery in the target battery parallel module. The size parameters include height and weight, and the thermal parameters include heat generation in an adiabatic environment and specific heat capacity of the battery.

[0065] Specifically, the dimensional parameters of a single battery in the target battery parallel module are obtained, including parameters such as the height and weight of a single battery. The dimensional parameters of a single battery are crucial for calculating the volume and mass of the battery, which in turn affects the calculation of thermal capacity and heat transfer.

[0066] Obtain the heat exchange environment parameters of the environment where the target battery parallel module is located, the heat exchange environment parameters including coolant specific heat capacity, coolant concentration, air specific heat capacity and air density;

[0067] Specifically, the thermal parameters of a single battery are obtained, including the heat generated in an adiabatic environment and the specific heat capacity of the battery. The heat generated in an adiabatic environment refers to the heat generated by the battery under specific conditions under ideal conditions without heat loss. The specific heat capacity of a battery refers to the amount of heat required to absorb a unit mass of battery material to increase by 1 degree Celsius. At the same time, the heat exchange environment parameters of the environment where the target battery parallel module is located are obtained, including the specific heat capacity of the coolant, the coolant concentration, the specific heat capacity of the air, and the air density. The heat exchange environment parameters are crucial for simulating and calculating the heat exchange process between the battery module and the surrounding environment.

[0068] In a specific embodiment, high-precision sensors may be deployed around the battery module to monitor and record the size parameters and thermal parameters of the battery, as well as the heat exchange environment parameters of the surrounding environment in real time.

[0069] 102. Based on the battery characteristic parameters, heat exchange environment parameters and experimental data of the target battery parallel module, heat transfer calculation is performed on the target battery parallel module to obtain a heat transfer calculation result;

[0070] Specifically, for step 102, heat transfer calculation is performed based on battery characteristic parameters (such as size, thermal parameters), heat exchange environment parameters (such as thermophysical properties of coolant and air) and experimental data. The heat transfer calculation can specifically include heat calculation of three different heat transfer modes, including calculation of heat absorption inside the triggering battery, total heat transferred to other batteries, heat transferred to the air, and heat transferred to the coolant.

[0071] Optionally, in some embodiments, step 102 of “performing heat transfer calculation on the target battery parallel module based on the battery characteristic parameters, heat exchange environment parameters and experimental data of the target battery parallel module to obtain a heat transfer calculation result” may specifically include:

[0072] Based on the battery characteristic parameters and experimental data of the target battery parallel module, calculate the amount of heat absorbed inside the trigger battery and the total amount of heat transferred from the trigger battery to other batteries;

[0073] Specifically, based on the battery characteristic parameters and experimental data, the heat absorbed by the battery that triggers thermal runaway (triggering battery) and the heat transferred from the triggering battery to other batteries in the module are calculated. For example, based on the battery characteristic parameters and experimental data, the specific heat capacity of the triggering battery and the temperature change data of the triggering battery are determined, so that the heat absorbed by the triggering battery is calculated according to the preset formula. For another example, based on the battery characteristic parameters and experimental data, the specific heat capacity of the triggering battery and the temperature change data between the triggering battery and other batteries are determined, and the total heat transferred from the triggering battery to other batteries can be calculated by substituting them into the preset formula.

[0074] Based on the battery characteristic parameters, heat exchange environment parameters and experimental data of the target battery parallel module, calculate the heat transferred from the trigger battery to the air and the heat transferred from the trigger battery to the coolant;

[0075] Specifically, based on the heat exchange environment parameters and experimental data, calculate the heat transferred by the trigger battery to the surrounding air through thermal radiation and convection, and calculate the heat transferred by the trigger battery to the coolant through contact with the coolant. For example, determine parameters such as air specific heat capacity, air density, coolant specific heat capacity and coolant density; obtain the measured surface area and volume of the trigger battery in contact with the air and coolant based on the experimental data, as well as the measured temperature difference between the trigger battery and the air and coolant. Substituting the above relevant parameters into the formula, the heat transferred by the trigger battery to the air and coolant can be calculated respectively.

[0076] 103. Based on experimental data and heat transfer calculation results, determine the optimal assembly and main heat transfer mode of the target battery parallel module;

[0077] Specifically, for step 103, by comparing the experimental data and the heat transfer calculation results, it is determined whether the module has heat spread. If heat spread does not occur, it is necessary to increase the vertical pressure relief height and continue testing until the maximum vertical pressure relief height is determined as the optimal assembly. If heat spread occurs, the main heat transfer mode of the target battery parallel module is determined.

[0078] Optionally, in some embodiments, step 103 of “determining the optimal assembly and main heat transfer mode of the target battery parallel module based on experimental data and heat transfer calculation results” may specifically include:

[0079] Based on experimental data and heat transfer calculation results, determine whether heat spread occurs in the target battery parallel module;

[0080] Specifically, by comparing the temperature and voltage data recorded in the experiment with the heat transfer calculation results, it is determined whether heat spread occurs in the battery module.

[0081] If not, increase the vertical pressure relief height of the target battery parallel module assembly, continue the heat spread test until the target battery parallel module has heat spread, determine the maximum vertical pressure relief height of the target battery parallel module, and use the maximum vertical pressure relief height as the optimal assembly;

[0082] Specifically, if the target battery parallel module does not experience heat spread, the critical point of heat spread is found by increasing the vertical pressure relief height and continuing the heat spread test. When the target battery parallel module experiences heat spread, the vertical pressure relief height at this time is recorded and used as the maximum allowable height, that is, the optimal assembly parameter.

[0083] If so, the main heat transfer mode of the target battery parallel module is determined based on the optimal assembly and heat transfer calculation results of the target battery parallel module.

[0084] Specifically, if heat spread occurs in the target battery parallel module, the main heat transfer mode (such as conduction, convection, and radiation) in the target battery parallel module under the optimal assembly conditions is determined by analyzing the heat transfer calculation results.

[0085] 104. Perform heat transfer optimization based on the optimal module assembly and the main heat transfer mode to control the heat spread of the target battery parallel module;

[0086] Specifically, for step 104, based on the optimal module assembly and the main heat transfer mode, heat transfer optimization processing is performed, such as adjusting the vertical pressure relief height and the amount of coolant to control the heat spread phenomenon of the target battery parallel module.

[0087] Optionally, in some embodiments, step 104 of “performing heat transfer optimization processing based on optimal module assembly and main heat transfer mode to control heat spread of the target battery parallel module” may specifically include:

[0088] Adjust the vertical pressure relief height of the target battery parallel module based on the optimal module assembly;

[0089] Specifically, based on heat transfer calculations and experimental data, the safe vertical pressure relief height from the triggering cell to other cells and the environment in the battery module, i.e. the optimal module assembly, is determined. In the battery module design, the vertical distance between cells is adjusted to ensure that the optimal vertical pressure relief height is reached before assembly, ensuring that each cell of the battery module meets the newly determined vertical pressure relief height standard.

[0090] Adjust the amount of coolant in the environment of the target battery parallel module based on the main heat transfer mode.

[0091] Specifically, the main heat transfer function of the coolant in the thermal management system is determined through heat transfer calculations, and the injection amount or flow rate of the coolant is adjusted according to the calculation results to improve the heat exchange efficiency. In addition, adjustments in the battery module can also include changing the design of the cooling channel or the coolant circulation system.

[0092] Optionally, in some embodiments, after heat transfer optimization processing is performed based on the optimal module assembly and the main heat transfer mode to control the heat spread of the target battery parallel module, the battery parallel module heat spread control method further includes:

[0093] Evaluate the heat spread effect of the target battery parallel module after heat transfer optimization treatment to obtain the evaluation results;

[0094] Specifically, after completing the heat transfer optimization process, that is, adjusting the vertical pressure relief height and the amount of coolant, the battery parallel module is tested again. The test data, including temperature, voltage, and related indicators of heat spread, are recorded. The heat spread control effect after optimization is evaluated and compared with the data before optimization.

[0095] Based on the evaluation results, the vertical pressure relief height of the target battery parallel module and the amount of coolant in the environment are adjusted.

[0096] Specifically, if the evaluation results show that the heat spread control effect is not good, the vertical pressure relief height or coolant volume is further adjusted based on the test data and analysis results. The test and evaluation process is repeated until a satisfactory heat spread control effect is achieved.

[0097] In order to facilitate understanding of the battery parallel module heat spread control method provided in this embodiment, this embodiment also provides a specific implementation method, such as Figure 2 As shown, the specific process is as follows: First, obtain the parameters such as the height, weight, specific heat capacity, heat generation in adiabatic environment, and gas generation of the whole battery cell of the test battery; obtain the specific heat capacity and density data of the coolant. Then, through a variety of triggering methods such as acupuncture, heating, and overcharging, the multi-parallel battery cells of the single battery are subjected to heat spread experiments at different vertical pressure relief heights. Next, obtain the heat spread test results of the modules assembled at different vertical heights. Record the temperature data of each battery in the module. Analyze the test data to determine whether heat spread occurs. If heat spread does not occur, proceed to the next step and use the current vertical height as the optimal module assembly. If heat spread occurs, it is necessary to increase the height of the vertical pressure relief space and then repeat the heat spread experiment. By continuously adjusting the height of the vertical pressure relief space and testing until the optimal vertical height assembly is found, ensure that heat spread is effectively controlled.

[0098] In a specific embodiment, the detailed process of the battery parallel module heat spread control method is as follows:

[0099] S1. Collect the size parameters (height h, weight m, etc.) and thermal parameters (heat generation Q in adiabatic environment, specific heat capacity C0) of a single battery, obtain the specific heat capacity C1 and density ρ1 data of the coolant, and obtain the specific heat capacity C2 and density ρ2 data of the air; wherein, a single battery may be a soft-pack, cylindrical, square battery or other type of battery, and the coolant may be one of Castrol 9913, Castrol 9904, and Castrol 2200.

[0100] S2. After assembling a certain number of batteries and welding parallel bar sheets, conduct heat propagation experiments of multiple parallel batteries with different vertical pressure relief heights using multiple triggering methods such as needle puncture, heating, and overcharging to trigger single batteries, and record the initial temperature T0, the vertical height H of the triggered battery module assembly, and the corresponding temperature T of each battery in the module at this time. 1,vent (trigger battery), T1,mid 、T 2,mid ,……,T x,mid 、T evn , Voltage. Among them, the bar sheet material is one of the 1000, 2000, 3000, 4000, 5000, 6000, 7000, 15, 20, 30, 40, 45, 50, 80, 890, 100 series aluminum materials; the assembly method can be that the battery is installed vertically, the pressure relief valve faces upward, and the spacing between batteries is set within the range of 0mm to 3mm. Taking cylindrical batteries as an example, different triggering methods and installation methods are as follows: Figure 3 shown.

[0101] S3. Perform heat transfer calculation based on battery size, thermal parameters, and cooling oil parameters. If the test result shows that the battery does not experience heat spread, execute step S5; otherwise, execute step S4.

[0102] Specifically, in step S3, the main heat transfer of the battery in the module is divided into ① triggering the battery to absorb heat internally (Qcell1#, Qcell1#→cell2#~x#); ② triggering the battery to open the valve and transfer heat to the air space above (Qcell1#→Air); ③ heat transfer in the coolant (Qcell1#→oil), such as Figure 4 As shown. Let the weight of a single battery be m, then the heat transfer of the battery in the module is calculated as follows:

[0103] Heat absorbed inside cell1#:

[0104] Q cell1# =C0mΔT

[0105] Heat absorbed by cell1#→cell2#~x#:

[0106] Q cell1#→cell2#～x# =C0m(ΔT 1→2 +ΔT 1→3 +…+ΔT 1→x )

[0107] Heat transfer in air:

[0108] Q cell1#→Air =C2ρ2V Air ΔT=1.005×1.29×10 -3 ×V air ×ΔT

[0109] =1.3×10 -3 V Air ΔT

[0110] Heat transfer in coolant:

[0111] Q ce ll 1# → o il =C1ρ1V o il ΔT=1.94ρ1V o il ΔT

[0112] S4. Increase the vertical pressure relief height of the module assembly, continue the parallel module heat spread test, obtain temperature and voltage data and perform heat transfer calculations, and determine the maximum safe vertical pressure relief height based on the test results.

[0113] In step S4, increasing the vertical height of the module assembly includes: increasing the height between the battery pressure relief valve and the upper protective plate

[0114] S5. Based on the optimal vertical height assembly of the module and heat transfer calculation, determine the most important heat transfer method and perform heat transfer optimization, such as increasing the amount of coolant.

[0115] Embodiment 1:

[0116] The present application will be described in detail below by taking a cylindrical battery as an example. A needle-trigger parallel module heat spread test with a vertical height of 2 mm is performed on the cylindrical battery and the relevant data is recorded, such as Figure 5 As shown, the following steps are included:

[0117] Step 1: Collect the size parameters (height h, weight m, etc.) of a single battery of this module, thermal parameters (heat generation Q in an adiabatic environment, specific heat capacity C0), obtain the specific heat capacity C1 and density ρ1 data of the coolant, and obtain the specific heat capacity C2 and density ρ2 data of the air;

[0118] Step 2: After assembling 7pcs of batteries and welding the parallel bar sheets, conduct a heat propagation experiment of 2mm vertical pressure relief height of multiple parallel batteries with needle puncture triggering the middle single battery, record the initial temperature T0, the vertical height H of the triggered battery module assembly and the corresponding temperature T1 of each battery in the module at this time, vent (triggering battery), T 1,mid 、T 2,mid ,……,T x,mid 、T evn 、Voltage。

[0119] Step 3: Calculate heat transfer based on battery size, thermal parameters, and cooling oil parameters:

[0120] Among them, the internal heat absorption of cell1# is: Q cell1# =C0mΔT=23.954kJ

[0121] cell1#→cell2#~x#:

[0122] Qcell1#→cell2#～x# =C0m(ΔT 1→2 +ΔT 1→3 +…+ΔT 1→x )=16.163kJ

[0123] Heat transfer in air:

[0124] Q cell1#→Air =C2ρ2V Air ΔT=1.005×1.29×10 -3 ×V Air ×ΔT=1.3×10 -3 V Air ΔT=1.218×10-2HΔT(negligible)

[0125] Heat transfer in coolant:

[0126] Q cell1#→oil =C1ρ1V oil ΔT=1.94ρ1V oil ΔT=0kJ (no temperature change of oil at the moment of thermal runaway) Total heat generated by a single battery: Qtotal=38.925kJ, Q=23.954+0+16.163=40.117kJ

[0127] Error η = (QQ total) / Q total = (40.117-38.925) / 38.925 = 3.06%

[0128] Step 4: Combine the test results with the heat transfer calculation to determine that this assembly is unqualified. It is necessary to increase the vertical pressure relief height of the module assembly to 3mm, continue to perform the parallel module heat spread test, and obtain temperature and voltage data, such as Figure 6 As shown, heat transfer calculation is performed at the same time:

[0129] Heat absorbed inside cell1#: Q cell1# =C0mΔT=9.801kJ

[0130] cell1#→cell2#~x#:

[0131] Q cell1#→cell2#～x# =C0m(ΔT 1→2 +ΔT 1→3 +…+ΔT 1→x )=9.320kJ

[0132] Heat transfer in air:

[0133] Q cell1#→Air =C2ρ2V Air ΔT=1.005×1.29×10 -3 ×V Air ×ΔT=1.3×

[0134] 10 -3 V Air ΔT=1.218×10-2HΔT(negligible)

[0135] Heat transfer in coolant: Q cell1#→oil =C1ρ1V oil ΔT=1.94ρ1V oil ΔT=20.152kJ

[0136] Total heat generated by a single battery: Qtotal = 38.925 kJ, Q = 9.801 + 9.320 + 20.152 = 39.273 kJ

[0137] Error η = (QQ total) / Q total = (39.273-38.925) / 38.925 = 0.89%

[0138] The test results showed that no heat spread occurred and the coolant took away 51.3% of the heat, so Q cell1#→oil The main heat transfer mode is as follows. Go to step 5.

[0139] Step 5. The optimal vertical height of this battery is 3mm. The main heat transfer method is to trigger the battery to the coolant. The module with this assembly can effectively prevent the heat spread of the module. Increasing the amount of coolant can effectively prevent the heat spread.

[0140] Embodiment 2:

[0141] Taking cylindrical batteries as an example, increase the amount of coolant, conduct a needle-trigger parallel module heat spread test with a vertical height of 3mm on the battery and record relevant data, such as Figure 7 As shown, the following steps are included:

[0142] Step 1: Collect the size parameters (height h, weight m, etc.) of a single battery of this module, thermal parameters (heat generation Q in an adiabatic environment, specific heat capacity C0), obtain the specific heat capacity C1 and density ρ1 data of the coolant, and obtain the specific heat capacity C2 and density ρ2 data of the air;

[0143] Step 2: After assembling 7pcs of batteries and welding the parallel bar sheets, conduct a heat propagation experiment of 2mm vertical pressure relief height of multiple parallel batteries with needle puncture triggering the middle single battery, record the initial temperature T0, the vertical height H of the triggered battery module assembly and the corresponding temperature T1 of each battery in the module at this time, vent (triggering battery), T 1,mid , T 2,mid ,……,T x,mid , T evn 、Voltage。

[0144] Step 3: Calculate heat transfer based on battery size, thermal parameters, and cooling oil parameters:

[0145] Heat absorbed inside cell1#: Q cell1# =C0mΔT=9.762kJ

[0146] cell1#→cell2#~x#:

[0147] Q cell1#→cell2#～x# =C0m(ΔT 1→2 +ΔT 1→3 +…+ΔT 1→x )=5.297kJ

[0148] Heat transfer in air:

[0149] Q cell1#→Air =C2ρ2V Air ΔT=1.005×1.29×10 -3 ×V Air ×ΔT=1.3×

[0150] 10 -3 V Air ΔT=1.218×10-2HΔT(negligible)

[0151] Heat transfer in coolant: Q cell1#→oil =C1ρ1V oil ΔT=1.94ρ1V oil ΔT=24.843kJ

[0152] Total heat generated by a single battery: Qtotal = 38.925 kJ, Q = 9.762 + 5.297 + 24.843 = 39.902 kJ

[0153] Error η = (QQ total) / Q total = (39.902-38.925) / 38.925 = 2.51%

[0154] Step 4: The test result shows that no heat spread occurs and the coolant takes away 62.3% of the heat, so Q cell1#→ool If the heat transfer mode is the main one, proceed to step 5.

[0155] Step 5. The optimal vertical height of this battery is 3mm. Increasing the amount of coolant will reduce the temperature rise of the surrounding batteries, that is, the impact on the surrounding batteries is smaller. The module with this assembly can effectively prevent the heat spread of the module; increasing the amount of coolant can effectively prevent the heat spread.

[0156] It can be seen that the heat spread control method of the battery parallel module provided in this embodiment is suitable for the vertical height assembly and heat transfer calculation of the heat spread of multi-battery parallel modules in multiple triggering modes. For the multi-battery parallel scenario of the actual module, by simply adjusting the height between the pressure relief valve and the upper protective plate in the battery module assembly, the triggered battery can instantly open the valve to spray out most of the heat when triggered by acupuncture, heating, overcharging, etc., and the heat is taken away by the coolant, thereby reducing the impact on the surrounding batteries and enhancing the safety of the module. At the same time, it avoids the accumulation of multiple flame retardant and heat insulation materials in the module, which leads to a reduction in the module energy density, and avoids the tediousness of remaking the model in the simulation design as the battery arrangement changes.

[0157] In summary, the method for controlling heat spread of parallel battery modules provided in the embodiment of the present application firstly performs a heat spread experiment on the target parallel battery module and records the corresponding experimental data; then, based on the battery characteristic parameters, heat exchange environment parameters and experimental data of the target parallel battery module, a heat transfer calculation is performed on the target parallel battery module to obtain a heat transfer calculation result; then, based on the experimental data and the heat transfer calculation result, the optimal assembly and main heat transfer mode of the target parallel battery module are determined; finally, heat transfer optimization processing is performed based on the optimal module assembly and the main heat transfer mode to control heat spread of the target parallel battery module. The battery parallel module heat spread control solution provided in the embodiment of the present application effectively controls and slows down heat spread, thereby improving the safety of multi-battery parallel modules in thermal runaway conditions by optimizing the vertical height assembly and heat transfer calculation of the battery modules. It does not require the use of expensive flame retardant and heat insulating materials and the addition of additional complex heat spread suppression devices, thereby reducing the complexity and volume of the module, thereby reducing the module manufacturing cost, and improving the energy density of the battery module. In addition, the embodiment of the present application can also adapt to different battery types and working environments, thereby improving the versatility of multi-battery parallel modules.

[0158] In addition, the present application also provides an electronic device, such as Figure 8 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0159] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 8 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0160] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0161] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and a method for controlling the thermal spread of a battery parallel module by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0162] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0163] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0164] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows:

[0165] Conduct a heat spread experiment on the target battery parallel module and record the corresponding experimental data; perform heat transfer calculation on the target battery parallel module based on the battery characteristic parameters, heat exchange environment parameters and experimental data of the target battery parallel module to obtain heat transfer calculation results; determine the optimal assembly and main heat transfer mode of the target battery parallel module based on the experimental data and heat transfer calculation results; perform heat transfer optimization processing based on the optimal module assembly and main heat transfer mode to control heat spread of the target battery parallel module.

[0166] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0167] The battery parallel module heat spread control solution provided in the present application effectively controls and slows down heat spread, thereby improving the safety of multi-battery parallel modules in thermal runaway conditions by optimizing the vertical height assembly and heat transfer calculation of the battery modules. It does not require the use of expensive flame retardant and heat insulating materials or the addition of additional complex heat spread suppression devices, thereby reducing the complexity and volume of the modules, thereby reducing the module manufacturing cost, while improving the energy density of the battery modules. In addition, the present application can also adapt to different battery types and working environments, thereby improving the versatility of multi-battery parallel modules.

[0168] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0169] To this end, an embodiment of the present application provides a storage medium in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any of the battery parallel module heat spread control methods provided in the embodiments of the present application. For example, the instructions can execute the following steps:

[0170] Conduct a heat spread experiment on the target battery parallel module and record the corresponding experimental data; perform heat transfer calculation on the target battery parallel module based on the battery characteristic parameters, heat exchange environment parameters and experimental data of the target battery parallel module to obtain heat transfer calculation results; determine the optimal assembly and main heat transfer mode of the target battery parallel module based on the experimental data and heat transfer calculation results; perform heat transfer optimization processing based on the optimal module assembly and main heat transfer mode to control heat spread of the target battery parallel module.

[0171] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0172] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0173] Since the instructions stored in the storage medium can execute the steps in any one of the battery parallel module heat spread control methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the battery parallel module heat spread control methods provided in the embodiments of the present application can be achieved. For details, please refer to the previous embodiments and will not be repeated here.

[0174] The above is a detailed introduction to a battery parallel module heat spread control method, device, electronic device and storage medium provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for controlling heat spread of parallel battery modules, characterized in that: include: Conduct heat spread experiment on target battery parallel modules and record corresponding experimental data; Based on the battery characteristic parameters, heat exchange environment parameters and the experimental data of the target battery parallel module, heat transfer calculation is performed on the target battery parallel module to obtain a heat transfer calculation result; Based on the experimental data and the heat transfer calculation results, determining the optimal assembly and main heat transfer mode of the target battery parallel module; Heat transfer optimization processing is performed based on the optimal module assembly and the main heat transfer mode to control the heat spread of the target battery parallel module.

2. The method for controlling heat spread of parallel battery modules according to claim 1, characterized in that: Before performing the heat spread experiment on the target battery parallel module and recording the corresponding experimental data, the method further includes: Assemble and weld a preset number of batteries to obtain a target battery parallel module; The battery characteristic parameters of the target parallel battery module and the heat exchange environment parameters of the environment where the target parallel battery module is located are obtained.

3. The method for controlling heat spread of parallel battery modules according to claim 2, characterized in that: The obtaining of the battery characteristic parameters of the target parallel battery module and the heat exchange environment parameters of the environment where the target parallel battery module is located includes: Obtaining the size parameters and thermal parameters of a single battery in the target battery parallel module, wherein the size parameters include height and weight, and the thermal parameters include heat generation in an adiabatic environment and specific heat capacity of the battery; The heat exchange environment parameters of the environment where the target battery parallel module is located are obtained, wherein the heat exchange environment parameters include coolant specific heat capacity, coolant concentration, air specific heat capacity and air density.

4. The method for controlling heat spread of parallel battery modules according to claim 1, characterized in that: The heat spread experiment is performed on the target battery parallel module, and the corresponding experimental data is recorded, including: Using multiple triggering methods to trigger the target triggering battery in the target battery parallel module to conduct heat propagation experiments at different vertical pressure relief heights; The experimental data corresponding to different vertical pressure relief heights under various triggering modes are recorded; the experimental data include the initial temperature, the vertical height of the triggering battery module assembly, and the temperature and voltage of each battery in the target battery parallel module.

5. The method for controlling heat spread of parallel battery modules according to claim 1, characterized in that: The heat transfer calculation is performed on the target battery parallel module based on the battery characteristic parameters, heat exchange environment parameters and the experimental data to obtain the heat transfer calculation result, including: Based on the battery characteristic parameters of the target battery parallel module and the experimental data, calculating the amount of heat absorbed inside the triggering battery and the total amount of heat transferred from the triggering battery to other batteries; Based on the battery characteristic parameters of the target battery parallel module, the heat exchange environment parameters and the experimental data, the heat transferred from the triggering battery to the air and the heat transferred from the triggering battery to the coolant are calculated.

6. The method for controlling heat spread of parallel battery modules according to claim 1, characterized in that: The determining, based on the experimental data and the heat transfer calculation results, the optimal assembly and main heat transfer mode of the target battery parallel module comprises: Based on the experimental data and the heat transfer calculation result, determining whether heat spread occurs in the target battery parallel module; If not, increase the vertical pressure relief height of the target battery parallel module assembly, continue the heat spread test, until the target battery parallel module has heat spread, determine the maximum vertical pressure relief height of the target battery parallel module, and use the maximum vertical pressure relief height as the optimal assembly; If so, based on the optimal assembly of the target battery parallel module and the heat transfer calculation result, the main heat transfer mode of the target battery parallel module is determined.

7. The method for controlling heat spread of parallel battery modules according to claim 1, characterized in that: The heat transfer optimization process based on the optimal module assembly and the main heat transfer mode is performed to control the heat spread of the target battery parallel module, including: Adjusting the vertical pressure relief height of the target battery parallel module based on the optimal module assembly; The amount of coolant in the environment where the target battery parallel module is located is adjusted based on the main heat transfer mode.

8. The method for controlling heat spread of parallel battery modules according to claim 7, characterized in that: After the heat transfer optimization process is performed based on the optimal module assembly and the main heat transfer mode to control the heat spread of the target battery parallel module, the method further includes: Performing a heat spread effect evaluation on the target battery parallel module after the heat transfer optimization process to obtain an evaluation result; Based on the evaluation results, the vertical pressure relief height of the target battery parallel module and the amount of coolant in the environment are adjusted.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method for controlling heat spread of parallel battery modules as described in any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the method for controlling heat spread of parallel battery modules as claimed in any one of claims 1 to 8 are implemented.

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