Battery, side patch thickness determination method, electronic device, and storage medium

Abstract

The application discloses a battery, a determination method of a side patch thickness, an electronic device and a storage medium. The battery comprises a core package, a side patch, a shell and an explosion-proof valve, the core package, the side patch and the shell surround a pressure relief flow channel communicating with the explosion-proof valve, and the side patch is arranged on a side surface of the core package of the battery. A ratio of the thickness of the side patch to a mounting spacing is located in an interval [0.2, 0.6], and the mounting spacing is a spacing between the side surface of the core package and an inner wall opposite to the shell. By reasonably setting the ratio of the thickness of the side patch to the mounting spacing in the interval [0.2, 0.6], the size of the pressure relief flow channel is relatively reasonable, so that the safety performance parameters at the explosion-proof valve meet the safety performance requirements of the battery, such as the maximum gas pressure that can be borne at the explosion-proof valve and the gas flow rate at the explosion-proof valve.

Description

Technical Field

[0001] This application relates to the field of battery safety design technology, specifically to a battery, a method for determining the thickness of a side patch, an electronic device, and a storage medium. Background Technology

[0002] Setting up dedicated flow channels inside the battery can promptly remove internal gases and heat when the battery experiences abnormal operating conditions such as electrical abuse or mechanical abuse, preventing the accumulation of gas and heat. This is an effective way to improve the safety performance of large-capacity batteries.

[0003] Therefore, there is an urgent need for a battery optimization design scheme that is compatible with the explosion-proof valve structure and can effectively improve battery safety performance. Summary of the Invention

[0004] This application provides a battery, a method for determining the thickness of a side patch, an electronic device, and a storage medium. It can design a reasonable ratio of side patch thickness and installation spacing for the pressure relief channel of an explosion-proof valve to ensure the safety performance of the battery.

[0005] On one hand, this application provides a battery, which includes a core pack, a side patch, a housing, and an explosion-proof valve. The core pack, the side patch, and the housing form a pressure relief channel communicating with the explosion-proof valve. The side patch is disposed on the side of the core pack of the battery. The ratio of the thickness of the side patch to the mounting spacing is in the range [0.2, 0.6], and the mounting spacing is the distance between the side of the core package and the inner wall of the housing.

[0006] On the other hand, embodiments of this application provide a method for determining the thickness of a side patch, the method comprising: Obtain a three-dimensional model of the battery with different side patch thicknesses, wherein the side patch is disposed on the side of the battery's core pack; Based on the three-dimensional models, flow field simulation of the pressure relief channel of the battery is performed to obtain the safety performance parameters corresponding to the thickness of each side patch. The pressure relief channel includes a gas channel connecting the inside of the battery to the explosion-proof valve. The safety performance parameters are used to characterize the safety performance of the battery. Based on the safety performance parameters corresponding to the thickness of each side patch, a mapping relationship between the side patch thickness and the safety performance parameters is constructed; Based on the mapping relationship and the required safety performance parameters, the thickness of the target side patch is determined.

[0007] On the other hand, embodiments of this application provide an electronic device, which includes a processor and a memory. The memory stores a computer program, and the processor executes the method for determining the thickness of the side patch as described in any of the above embodiments by calling the computer program stored in the memory.

[0008] On the other hand, embodiments of this application provide a computer-readable storage medium storing a computer program adapted for loading by a processor to perform the method for determining the thickness of the side patch as described in any of the above embodiments.

[0009] In the battery, side patch thickness determination method, electronic device, and storage medium provided in this application embodiment, the core package, side patch, and housing form a pressure relief channel connecting to the explosion-proof valve. Therefore, in order to ensure the safety performance of the battery, the safety performance parameters at the explosion-proof valve can be designed.

[0010] Since the distance between the side patch and the inner wall of the housing directly affects the flow space of the pressure relief channel, and the flow space affects the pressure relief capacity, changes in the flow space of the pressure relief channel also affect the maximum gas pressure that the explosion-proof valve can withstand when open. Therefore, by reasonably setting the ratio of the side patch thickness to the installation spacing within the range [0.2, 0.6], the size of the pressure relief channel can be made more reasonable, thereby ensuring that the safety performance parameters at the explosion-proof valve meet the battery's safety performance requirements, such as the maximum gas pressure that the explosion-proof valve can withstand and the gas flow rate at the explosion-proof valve. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional exploded view of the battery provided in an embodiment of this application.

[0013] Figure 2 This is a schematic diagram of a battery cross-section obtained by cutting the side plate of the vertical casing provided in the embodiment of this application.

[0014] Figure 3 This is a schematic diagram illustrating a method for determining the thickness of a side patch provided in an embodiment of this application.

[0015] Figure 4 A schematic diagram of the first mapping relationship constructed for the method of determining the thickness of the side patch provided in the embodiments of this application.

[0016] Figure 5 A schematic diagram of the second mapping relationship constructed for the method of determining the thickness of the side patch provided in the embodiments of this application.

[0017] Figure 6 This is a schematic diagram of an example battery design system provided in an embodiment of this application.

[0018] Figure 7 This is a first flowchart illustrating the method for determining the thickness of the side patch provided in an embodiment of this application.

[0019] Figure 8 This is a second flowchart illustrating the method for determining the thickness of the side patch provided in an embodiment of this application.

[0020] Figure 9 This is a schematic diagram of the device for determining the thickness of the side patch provided in an embodiment of this application.

[0021] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Please see Figure 1 and Figure 2 This application provides a battery 10, which includes a core pack 11, a side patch 12, a housing 13 and an explosion-proof valve 14. The core pack 11, the side patch 12 and the housing 13 form a pressure relief channel 15 that communicates with the explosion-proof valve 14. The side patch 12 is disposed on the side of the core pack 11 of the battery 10.

[0024] Among them, battery 10 refers to an electrochemical device that can realize the mutual conversion of chemical energy and electrical energy. For example, in terms of shape, the battery can be a square battery, a cylindrical battery, etc., and in terms of chemical composition, the battery can be a lithium-ion battery, a sodium-ion battery, etc.

[0025] Among them, the core pack 11 of battery 10 refers to the core reaction component of the battery formed by winding or stacking positive electrode sheet, negative electrode sheet and separator, which is the main body for lithium ion insertion / extraction, transport and electrochemical reaction. Among them, the side tape 12 (Side Tape / Side Insulation Tape) is an insulating protective tape that is attached to the side of the battery cell pack. It is used to isolate the side of the cell and prevent short circuits between the terminals. At the same time, the side tape also has the effects of fixing the electrode group, assisting thermal management and mechanical protection. It is a key component in battery safety and assembly.

[0026] Side patches 12 are attached to the sides of the core pack 11, forming a pressure relief channel 15 between the side patch 12 and the inner wall of the battery casing 13 for the flow of thermal runaway gas. Different dimensions of the pressure relief channel 15 will affect the flow field of the pressure relief channel 15. After the battery 10 is manufactured, the installation spacing between the side of the core pack 11 and the inner wall of the casing 13 is generally fixed. Therefore, different thicknesses of the side patches 12 will directly affect the flow field of the pressure relief channel 15, thereby affecting the safety performance parameters of the explosion-proof valve 14.

[0027] In one alternative embodiment, the ratio of the thickness of the side patch 12 to the mounting spacing is in the range [0.2, 0.6], where the mounting spacing is the distance between the side of the core package 11 and the inner wall of the housing 13 opposite to it.

[0028] For example, the installation spacing can be in the direction perpendicular to the side of the core package (e.g.) Figure 1 (The distance between the side of the cell pack 11 and the inner wall of the casing 13 in the height direction of the battery).

[0029] Through experiments or simulations, it was determined that when the ratio of the thickness of the side patch 12 to the installation spacing is in the range [0.2, 0.6], the safety performance parameters of the battery 10 can meet the requirements, such as the gas pressure and / or gas flow rate at the explosion-proof valve 14 meeting the valve opening parameter requirements during battery thermal runaway.

[0030] In the battery 10 provided in this application embodiment, the core pack 11, the side patch 12 and the shell 13 form a pressure relief channel 15 that connects to the explosion-proof valve 14. Therefore, in order to ensure the safety performance of the battery 10, the safety performance parameters at the explosion-proof valve 14 can be designed.

[0031] Since the distance between the side patch 12 and the inner wall of the housing 13 directly affects the flow space of the pressure relief channel 15, and the flow space affects the pressure relief capacity, the change in the flow space of the pressure relief channel 15 will also affect the maximum gas pressure that the explosion-proof valve 14 can withstand when it is open. Therefore, by reasonably setting the ratio of the thickness of the side patch 12 to the installation distance to be in the range [0.2, 0.6], the size of the pressure relief channel 15 can be made more reasonable, thereby ensuring that the safety performance parameters at the explosion-proof valve 14 meet the safety performance requirements of the battery, such as the maximum gas pressure that the explosion-proof valve 14 can withstand and the gas flow rate at the explosion-proof valve 14.

[0032] In one alternative embodiment, the safety performance parameters of the battery 10 can meet the requirements when the thickness of the side patch 12 is in the range of [0.5 mm, 3 mm].

[0033] It is understandable that, with the installation spacing remaining unchanged, simply limiting the thickness range of the side patch 12 is sufficient to meet the safety performance requirements.

[0034] Among them, safety performance parameters are parameters that characterize the safety performance of the battery.

[0035] In one optional embodiment, the safety performance parameters include the gas pressure and gas flow rate at the explosion-proof valve 14. It is understood that the safety performance parameters are generally critical values, representing the parameters that trigger the opening of the explosion-proof valve 14.

[0036] The higher the upper limit of the gas pressure at the explosion-proof valve 14, the greater the gas pressure required for the internal pressure of the battery 10 to burst the casing 13, and the higher the safety of the battery 10. The upper limit of the gas flow rate at the explosion-proof valve 14 reflects whether the thermal runaway gas can be discharged quickly and smoothly. The greater the gas flow rate, the faster the gas can flow out after the explosion-proof valve 14 is opened, and the higher the safety of the battery 10 will be.

[0037] Therefore, the gas pressure and gas flow rate at the explosion-proof valve 14 together determine the critical values ​​for battery 10 to explode, catch fire, and run away with the jet, thus directly characterizing its safety performance.

[0038] In one alternative embodiment, the gas pressure at the explosion-proof valve 14 is in the range [34 kPa, 43 kPa], and the gas flow rate at the explosion-proof valve 14 is in the range [189 m / s, 205 m / s].

[0039] Thus, by limiting the thickness range of the side patch 12, the gas pressure and gas flow rate at the explosion-proof valve 14 can be ensured to be within the range that meets the safety performance requirements.

[0040] Please see Figure 3 In one example, the poles of the explosion-proof valve 14 and the core package 11 are respectively set at both ends of the core package. For the scheme with a side patch thickness of 0.5 mm, it can be seen that the gas pressure at the explosion-proof valve 14 is 35.8 kPa and the gas flow velocity at the explosion-proof valve is 196.2 m / s. For the scheme with a side patch 12 thickness of 2 mm, it can be seen that the gas pressure at the explosion-proof valve 14 is 37.2 kPa and the gas flow velocity at the explosion-proof valve 14 is 193.9 m / s; For the scheme with a side patch 12 thickness of 3 mm, it can be seen that the gas pressure at the explosion-proof valve 14 is 41.4 kPa and the gas flow rate at the explosion-proof valve 14 is 190.7 m / s.

[0041] Thus, it can be seen that the safety performance parameters of the side patch 12 scheme with different thicknesses within the range of [0.5 mm, 3 mm] all meet the safety performance requirements.

[0042] It is understood that this application uses the example of the explosion-proof valve 14 and the terminal post of the core pack 11 being respectively set at both ends of the core pack 11 for explanation. For the battery 10 with the explosion-proof valve 14 and the terminal post of the core pack 11 respectively set at the same end of the core pack, the safety performance parameters corresponding to different side patch 12 thickness schemes also meet the safety performance requirements, and will not be elaborated here.

[0043] In some embodiments, the area of ​​the explosion-proof valve 14 is in the range of [420 mm², 1050 mm²], and the area of ​​the explosion-proof valve 14 is negatively correlated with both the gas pressure and the gas flow rate at the explosion-proof valve 14.

[0044] Furthermore, it is understood that the area of ​​the explosion-proof valve 14 also affects the safety performance parameters. The safety performance parameters for different explosion-proof valve 14 areas and different side patch 12 thicknesses are shown in Tables 1 and 2 below. Table 1 shows the gas pressure for different explosion-proof valve 14 areas and different side patch 12 thicknesses, and Table 2 shows the gas flow rate for different explosion-proof valve 14 areas and different side patch 12 thicknesses.

[0045]

[0046] Table 1

[0047] Table 2 It can be seen that when the thickness of the control side patch 12 is different, the area of ​​the explosion-proof valve 14 is negatively correlated with both the gas pressure and gas flow rate at the explosion-proof valve 14. However, when the area of ​​the control explosion-proof valve 14 remains unchanged, the thickness of the side patch 12 is positively correlated with the gas pressure, and negatively correlated with the gas flow rate.

[0048] The thickness of the side patch 12 is positively correlated with the gas pressure, as follows: Figure 4 As shown, the thickness of the side patch 12 is negatively correlated with the gas flow rate. Figure 5 As shown.

[0049] Please continue reading. Figure 1 In one optional embodiment, the housing 13 includes a first top cover 131, a side plate 132, and a second top cover 133. The first top cover 131 and the second top cover 133 are disposed opposite to each other. The side plate 132 connects the first top cover 131 and the second top cover 133. An explosion-proof valve 14 is disposed on the first top cover 131 or the second top cover 133.

[0050] It is understandable that the explosion-proof valve 14 can be set on the same side as the terminal of the core pack 11, or it can be set on the opposite side of the terminal of the core pack 11, in order to adapt to the needs of different types of batteries and thermal runaway handling.

[0051] In one alternative embodiment, the core package 11 has two opposing first sides and two opposing second sides, and side patches 12 are disposed on the two first sides and / or the two second sides.

[0052] The energy storage industry is rapidly shifting from policy-driven to market-driven growth, but safety remains a key bottleneck hindering its development. As the fundamental unit of electrochemical energy storage systems, batteries are increasingly favored by the market for larger capacity products (e.g., 500+ Ah). Industry experts point out that the larger the battery, the higher the risk of thermal runaway accidents. Therefore, the safety design of large-capacity batteries is particularly important. Designing internal flow channels to guide the premature release of gases and heat caused by abuse scenarios such as electrical and mechanical misuse, thus preventing the accumulation of large amounts of gas and heat, is currently an effective method for designing high-safety, large-capacity batteries. How to design effective flow channels and improve battery safety performance are pressing technical problems that need to be solved.

[0053] Currently, the design of internal flow channels in batteries generally relies on the experience of engineers. If the safety performance of the designed battery does not meet the standards, it needs to be redesigned, resulting in low efficiency in the design of internal flow channels in batteries.

[0054] Therefore, embodiments of this application also provide a method, apparatus, storage medium, device, and program product for determining the thickness of a side patch. Specifically, the method for determining the thickness of a side patch according to embodiments of this application can be executed by an electronic device, wherein the electronic device can be a terminal or server, etc.

[0055] The terminal can be a smartphone, tablet, laptop, smart TV, wearable smart device, smart vehicle terminal, etc. The terminal can also include a client, which can be a game client, browser client, instant messaging client, or mini-program, etc.

[0056] A server can be a standalone physical server, a server cluster or distributed system consisting of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and big data and artificial intelligence platforms.

[0057] It should be noted that, in the embodiments of this application, the execution subject of the method for determining the thickness of the side patch can be a terminal device or a server, and the embodiments of this application do not limit the type of execution subject.

[0058] It is understood that in the specific implementation of this application, user object data, context data and other related data are involved. When the embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0059] For example, in conjunction with the above description, Figure 6 This application illustrates a battery design system 1000 for implementing a method for determining the thickness of a side patch, as provided in an embodiment of this application. The battery design system 1000 may include at least one terminal 1001, at least one server 1002, at least one database 1003, and a network. The terminal 1001 can connect to different servers via the network. The terminal can be any device with computing hardware capable of supporting and executing software applications corresponding to games.

[0060] Furthermore, when the battery design system 1000 includes multiple terminals, multiple servers, and multiple networks, different terminals can connect to each other through different networks and servers. The network can be a wireless network or a wired network, such as a wireless local area network (WLAN), local area network (LAN), cellular network, 2G network, 3G network, 4G network, 5G network, etc. Additionally, different terminals can also connect to other terminals or to servers using their own Bluetooth networks or hotspot networks. Furthermore, the system 100 can include multiple databases coupled to different servers, and can continuously store game-related information in the databases while different users are playing multiplayer games online.

[0061] It should be noted that, Figure 6 The schematic diagram of the battery design system shown is merely an example. The battery design system 1000 described in this application embodiment is intended to more clearly illustrate the technical solutions of this application embodiment and does not constitute a limitation on the technical solutions provided in this application embodiment. As those skilled in the art will know, with the evolution of battery design systems and the emergence of new business scenarios, the technical solutions provided in this application embodiment are also applicable to similar technical problems.

[0062] The technical solution of this application will be described in detail below through specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0063] Please see Figure 7 It should be noted that the steps shown may be performed in a logical order different from that shown in the flowchart. The method for determining the side patch thickness of this application may include the following steps: Step 011: Obtain the 3D model of the battery under different side patch thicknesses. The side patches are set on the side of the battery's core pack.

[0064] After constructing a 3D model of the battery with any side patch thickness, by adjusting the side patch thickness of the model, 3D models of the battery with different side patch thicknesses can be quickly constructed, resulting in high construction efficiency.

[0065] When constructing a 3D model, at least the components that form the pressure relief channel among the various parts of the battery should be constructed to ensure the accuracy of the subsequent flow field simulation of the pressure relief channel.

[0066] Step 012: Based on each three-dimensional model, perform flow field simulation of the battery's pressure relief channel to obtain the safety performance parameters corresponding to the thickness of each side patch. The pressure relief channel includes a gas channel connecting the battery interior to the explosion-proof valve. The safety performance parameters are used to characterize the battery's safety performance.

[0067] Among them, the explosion-proof valve is a pressure relief protection device installed on the battery casing or cover plate. It is used to open under a preset pressure threshold when high pressure gas is generated inside the battery due to abnormal conditions such as thermal runaway. The gas is discharged in a direction through the flow channel to reduce the internal pressure of the battery and prevent the casing from bursting or causing more serious safety accidents.

[0068] Among them, flow field simulation refers to the numerical simulation of the flow process of high temperature and high pressure gas in the pressure relief channel during battery thermal runaway based on computational fluid dynamics (CFD) method. By solving the fluid control equations, the pressure distribution, velocity distribution, streamline distribution and flow characteristics inside the channel are obtained. This is used to evaluate the flow guiding capacity, exhaust smoothness and pressure relief efficiency of the pressure relief channel, and to provide quantitative basis for channel structure optimization and battery safety performance verification.

[0069] Specifically, after obtaining each three-dimensional model, the flow field of the battery's pressure relief channel can be simulated to simulate the flow field of the pressure relief channel, thereby determining the safety performance parameters corresponding to each three-dimensional model.

[0070] Please see Figure 8 In one optional embodiment, step 012 includes: Step 0121: Assign physical property parameters to the gas in the pressure relief channel. The physical property parameters include at least one of the following: gas density, dynamic viscosity coefficient, specific heat capacity, and thermal conductivity. Step 0122: Set the boundary conditions of the pressure relief channel. The boundary conditions include setting the flow boundary parameters of the flow inlet and the pressure boundary parameters of the pressure outlet of the pressure relief channel. The flow inlet is an explosion-proof valve, and the flow boundary parameters are determined based on the gas generation test results of battery thermal runaway. Step 0123: Perform pressure field calculation on the pressure relief channel to obtain the gas pressure and gas flow velocity at the explosion-proof valve.

[0071] Specifically, when performing flow field simulation, fluid mechanics knowledge is introduced. Based on the actual composition and operating temperature of the gas generated during battery thermal runaway, the gas in the pressure relief channel is assigned corresponding fluid properties, including at least one of the following: gas density, dynamic viscosity coefficient, specific heat capacity, and thermal conductivity. This makes the simulation environment closer to the real thermal runaway exhaust process and ensures that the calculation results are accurate and reliable.

[0072] Secondly, reasonable fluid boundary conditions are set for the pressure relief channel. The explosion-proof valve is set as the flow inlet, and the flow boundary parameters are determined based on the gas production volume and gas production rate obtained from the battery thermal runaway gas production test (such as ARC test) to simulate the real excitation of the gas generated by thermal runaway being discharged from the explosion-proof valve. At the same time, the end of the channel away from the explosion-proof valve is set as the pressure outlet, and pressure boundary conditions are given to form a complete flow field calculation constraint.

[0073] Based on this, pressure field and flow field simulation calculations were performed inside the pressure relief channel to obtain the gas pressure and gas velocity at the explosion-proof valve.

[0074] The gas pressure at the explosion-proof valve can reflect the risk of internal pressure buildup and the degree of pressure buildup in the battery, while the flow rate can reflect the gas release efficiency and the smoothness of venting. Together, they characterize the pressure release capacity of the pressure relief channel and the overall safety performance of the battery.

[0075] Step 013: Based on the safety performance parameters corresponding to the thickness of each side patch, construct a mapping relationship between the side patch thickness and the safety performance parameters.

[0076] Among them, the thickness of the side patch directly affects the effective flow cross-sectional area of ​​the pressure relief channel between the core and the inner wall of the shell, thereby changing the gas flow rate, pressure loss and boundary pressure at the explosion-proof valve in the channel, and finally forming a quantitative correspondence between the thickness of the side patch and safety performance parameters such as the battery's thermal runaway pressure relief capacity and internal pressure buildup.

[0077] Specifically, after obtaining the safety performance parameters corresponding to the thickness of each side patch through simulation, the thickness of each side patch and the corresponding safety performance parameters can be used as a set of data to obtain multiple sets of data. Based on these multiple sets of data, a mapping relationship between the side patch thickness and the safety performance parameters can be constructed.

[0078] In one alternative embodiment, a mapping relationship is generated by fitting based on the least squares method and the safety performance parameters corresponding to the thickness of each side patch.

[0079] The relationship between the side patch thickness and safety performance parameters is generally non-linear.

[0080] It is understandable that the flow cross-sectional area of ​​the pressure relief channel is geometrically inversely proportional to the thickness of the side patch. As the thickness of the side patch increases, the equivalent diameter of the channel decreases, and the flow cross-sectional area decreases nonlinearly. Furthermore, the fluid resistance is nonlinearly related to the flow cross-sectional area. The fluid resistance increases rapidly with the increase of the side patch thickness, resulting in a sharp increase in pressure and flow velocity. The effect is weak when the thickness is small, and the effect is more severe when the thickness is large.

[0081] It can be seen that the thickness of the side patch and the gas pressure at the explosion-proof valve have a positive nonlinear relationship, and the thickness of the side patch and the gas flow rate at the explosion-proof valve have a positive nonlinear relationship.

[0082] Therefore, the least squares method is used to perform nonlinear fitting on the thickness of each side patch and the corresponding safety performance parameters, constructing a mapping model in the form of a quadratic polynomial or exponential function. By minimizing the sum of squared residuals, the fitting coefficients are determined, and finally the mapping relationship between the side patch thickness and the safety performance parameters is obtained.

[0083] Please refer to it again. Figure 8 In an optional embodiment, step 013, determining the target side patch thickness based on the mapping relationship and required safety performance parameters, includes: Step 0131: Based on the gas pressure corresponding to each side patch, establish the first mapping relationship between gas pressure and side patch thickness; Step 0132: Based on the gas flow rate corresponding to each side patch, construct a second mapping relationship between gas flow rate and side patch thickness.

[0084] Therefore, the least squares method is used to perform nonlinear fitting on the thickness of each side patch and the corresponding gas pressure, constructing a mapping model in the form of a quadratic polynomial or exponential function. The fitting coefficients are determined by minimizing the sum of squared residuals, ultimately obtaining the first mapping relationship between the side patch thickness and the gas pressure. Similarly, nonlinear fitting is performed on the thickness of each side patch and the corresponding gas velocity, constructing a mapping model in the form of a quadratic polynomial or exponential function. The fitting coefficients are determined by minimizing the sum of squared residuals, ultimately obtaining the second mapping relationship between the side patch thickness and the gas velocity.

[0085] In one example, the data in Tables 1 and 2 can be obtained through deterministic simulation. Based on the gas pressure corresponding to the thickness of each side patch in Table 1, a simulation can be constructed as follows: Figure 4The first mapping relationship shown in Table 2 reveals a non-linear positive correlation between the side patch thickness and the gas pressure. Based on the gas flow rate corresponding to each side patch thickness in Table 2, a mapping can be constructed as follows: Figure 5 The second mapping relationship shown can be interpreted as a non-linear negative correlation between the side patch thickness and the gas flow rate.

[0086] It is understandable that when constructing the first and second mapping relationships, more safety performance parameters corresponding to different side patch thicknesses can be obtained through simulation to improve the accuracy of the mapping relationship construction, and no restrictions are imposed here.

[0087] Step 014: Determine the thickness of the target side patch based on the mapping relationship and the required safety performance parameters.

[0088] Among them, the required safety performance parameters are safety performance parameters set based on the safety performance requirements of the battery, which can ensure that the safety performance of the battery meets the requirements.

[0089] It is understandable that battery safety performance often conflicts with battery performance and cost. Ultimately, batteries need to strike a balance between safety, performance and cost, improving battery performance as much as possible and reducing costs while meeting safety requirements.

[0090] Therefore, the safety performance parameters required for the battery are determined after balancing. Based on the required safety performance parameters, the thickness of the target side patch can be quickly determined by querying the established mapping relationship. The thickness of the target side patch can meet the required safety performance. Furthermore, due to the flow field simulation achieved by introducing fluid dynamics and the three-dimensional model of the battery, the accuracy of the mapping relationship can be guaranteed, thereby ensuring that the determined thickness of the target side patch meets the safety performance requirements.

[0091] Please refer to it again. Figure 8 In an optional embodiment, step 014, determining the target side patch thickness based on the mapping relationship and required safety performance parameters, includes: Step 0141: Determine the thickness of the first side patch based on the first mapping relationship and the required gas pressure; Step 0142: Determine the thickness of the second side patch based on the second mapping relationship and the required gas flow rate; Step 0143: Determine the larger of the first side patch thickness and the second side patch thickness as the target side patch thickness.

[0092] It can be understood that the mapping relationship includes the first mapping relationship between the side patch thickness and the gas pressure, and the second mapping relationship between the side patch thickness and the gas flow rate.

[0093] Based on the required gas pressure and the first mapping relationship, the thickness of the first side patch that meets the gas pressure requirement can be quickly determined; and based on the required gas flow rate and the second mapping relationship, the thickness of the second side patch that meets the gas flow rate requirement can be quickly determined.

[0094] To simultaneously meet the requirements for gas pressure and gas flow rate, the larger of the thickness of the first side patch and the thickness of the second side patch can be selected as the target side patch thickness.

[0095] All of the above technical solutions can be combined in any way to form optional embodiments of this application, and will not be described in detail here.

[0096] The method for determining the thickness of the side patch in this application involves establishing a three-dimensional model of a battery with different side patch thicknesses, and then performing flow field simulation of the pressure relief channel connected to the explosion-proof valve in the battery based on the three-dimensional model. This yields the flow field simulation results of the three-dimensional model corresponding to different side patch thicknesses, thereby determining the safety performance parameters characterizing the battery's safety performance corresponding to each side patch thickness.

[0097] Since there is a regular relationship between the thickness of the side patch and the safety performance, a mapping relationship between the side patch thickness and the safety performance parameters can be constructed based on the safety performance parameters corresponding to each side patch thickness.

[0098] In this way, when there are subsequent safety performance parameters that need to be specified, the side patch thickness can be quickly determined through this mapping relationship, enabling rapid design of the target side patch thickness. This is not only highly efficient, but also ensures the accuracy of the mapping relationship through flow field simulation achieved by introducing fluid dynamics and a three-dimensional battery model, thereby ensuring that the determined target side patch thickness meets the safety performance requirements.

[0099] To facilitate better implementation of the side patch thickness determination method of the embodiments of this application, the embodiments of this application also provide a side patch thickness determination device. Please refer to... Figure 9 , Figure 9 A schematic diagram of the structure of the side patch thickness determination device provided in an embodiment of this application. The side patch thickness determination device 200 may include: The acquisition module 201 is used to acquire the three-dimensional model of the battery under different side patch thicknesses, wherein the side patch is set on the side of the battery core pack; The simulation module 202 is used to perform flow field simulation of the battery's pressure relief channel based on various three-dimensional models, so as to obtain the safety performance parameters corresponding to the thickness of each side patch. The pressure relief channel includes a gas channel connecting the inside of the battery to the explosion-proof valve. The safety performance parameters are used to characterize the safety performance of the battery. Module 203 is used to construct a mapping relationship between the side patch thickness and the safety performance parameters based on the safety performance parameters corresponding to the thickness of each side patch. Module 204 is used to determine the thickness of the target side patch based on the mapping relationship and the required safety performance parameters.

[0100] Each module or unit in the aforementioned device for determining the thickness of the side patch can be implemented entirely or partially through software, hardware, or a combination thereof. Each of these units can be embedded in or independent of the processor in the electronic device in hardware form, or stored in the memory of the electronic device in software form, so that the processor can call and execute the operations corresponding to each of these units.

[0101] The side patch thickness determining device 200 can be integrated into a terminal or server that has storage and a processor and thus computing power, or the side patch thickness determining device 200 can be the terminal or server.

[0102] Optionally, this application also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0103] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may be a terminal or a server. Figure 10 As shown, the electronic device 300 includes a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, and a computer program stored in the memory 302 and executable on the processor. The processor 301 and the memory 302 are electrically connected. Those skilled in the art will understand that the electronic device structure shown in the figures does not constitute a limitation on the electronic device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0104] The processor 301 is the control center of the electronic device 300. It connects various parts of the electronic device 300 through various interfaces and lines. By running or loading 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 300 and processes data, thereby performing overall processing of the electronic device 300.

[0105] Optional, such as Figure 10 As shown, the electronic device 300 also includes: a display screen 303, a radio frequency circuit 304, an audio circuit 305, an input unit 306, and a power supply 307. The processor 301 is electrically connected to the display screen 303, the radio frequency circuit 304, the audio circuit 305, the input unit 306, and the power supply 307. Those skilled in the art will understand that... Figure 10The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0106] The display screen 303 can be used to display a graphical user interface (GUI) and receive operation commands generated by the user interacting with the GUI. The display screen 303 may include a display panel and a touch panel. The display panel can be used to display information input by the user or information provided to the user, as well as various graphical user interfaces of the electronic device. These graphical user interfaces can be composed of graphics, text, icons, video, and any combination thereof. The touch panel can be used to collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch panel), generate corresponding operation commands, and execute the corresponding program. Optionally, the touch panel may include a touch detection device and a touch controller. The touch detection device detects the user's touch location and the signal generated by the touch operation, and transmits the signal to the touch controller. The touch controller receives touch information from the touch detection device, converts it into touch point coordinates, sends it to the processor 301, and can receive and execute commands from the processor 301. The touch panel can cover the display panel. When the touch panel detects a touch operation on or near it, it transmits the information to the processor 301 to determine the type of touch event. Subsequently, the processor 301 provides corresponding visual output on the display panel according to the type of touch event. In this embodiment, the touch panel and the display panel can be integrated into the display screen 303 to achieve input and output functions. However, in some embodiments, the touch panel and the display screen 303 can be implemented as two independent components to achieve input and output functions. That is, the display screen 303 can also be used as part of the input unit 306 to achieve input functions.

[0107] The radio frequency circuit 304 can be used to transmit and receive radio frequency signals to establish wireless communication with network devices or other electronic devices, and to transmit and receive signals with network devices or other electronic devices.

[0108] Audio circuitry 305 can be used to provide an audio interface between a user and an electronic device via a speaker and a microphone. Audio circuitry 305 converts received audio data into electrical signals, transmits them to the speaker, and the speaker converts them into sound signals for output. Conversely, the microphone converts collected sound signals into electrical signals, which are then received by audio circuitry 305, converted back into audio data, and then processed by processor 301 before being transmitted via radio frequency circuitry 304 to, for example, another electronic device, or output to memory 302 for further processing. Audio circuitry 305 may also include an earphone jack to facilitate communication between peripheral headphones and electronic devices.

[0109] The input unit 306 can be used to receive input numbers, characters, or object feature information (such as fingerprints, irises, facial information, etc.), and to generate keyboard, mouse, joystick, optical, or trackball signal inputs related to user settings and function control.

[0110] Power supply 307 is used to supply power to various components of electronic device 300. Optionally, power supply 307 can be logically connected to processor 301 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. Power supply 307 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0111] although Figure 10 As not shown in the diagram, the electronic device 300 may also include a camera, sensor, wireless fidelity module, Bluetooth module, etc., which will not be described in detail here.

[0112] This application also provides a computer-readable storage medium for storing a computer program. This computer-readable storage medium can be applied to an electronic device, and the computer program causes the electronic device to execute the corresponding process in the side patch thickness determination method of the embodiments of this application; for the sake of brevity, it will not be described in detail here.

[0113] This application also provides a computer program product including computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the corresponding process in the side patch thickness determination method described in the embodiments of this application. For simplicity, further details are omitted here.

[0114] It should be understood that the processor in this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0115] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0116] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0117] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0118] In the embodiments of this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0120] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0121] In addition, the functional units in this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0122] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device (which may be a personal computer or a server) to execute all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0123] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery, characterized in that, The battery includes a core pack, a side patch, a housing, and an explosion-proof valve. The core pack, the side patch, and the housing form a pressure relief channel communicating with the explosion-proof valve. The side patch is disposed on the side of the core pack of the battery. The ratio of the thickness of the side patch to the mounting spacing is in the range [0.2, 0.6], and the mounting spacing is the distance between the side of the core package and the inner wall of the housing.

2. The battery according to claim 1, characterized in that, The thickness of the side patch is in the range [0.5 mm, 3 mm].

3. The battery according to claim 1 or 2, characterized in that, The gas pressure at the explosion-proof valve is in the range of [34 kPa, 43 kPa], and the gas flow velocity at the explosion-proof valve is in the range of [189 m / s, 205 m / s].

4. The battery according to claim 3, characterized in that, The thickness of the side patch is positively correlated with the gas pressure, and the thickness of the side patch is negatively correlated with the gas flow rate.

5. The battery according to claim 1, characterized in that, The area of ​​the explosion-proof valve is located in the range of [420 square millimeters, 1050 square millimeters]. The area of ​​the explosion-proof valve is negatively correlated with both the gas pressure and the gas flow rate at the explosion-proof valve.

6. The battery according to claim 1, characterized in that, The housing includes a first top cover, a side plate, and a second top cover. The first top cover and the second top cover are disposed opposite to each other. The side plate connects the first top cover and the second top cover. The explosion-proof valve is disposed on the first top cover or the second top cover.

7. A method for determining the thickness of a side patch, characterized in that, The method for determining the thickness of the side patch of the battery according to any one of claims 1 to 6 includes: Obtain a three-dimensional model of the battery with different side patch thicknesses, wherein the side patch is disposed on the side of the battery's core pack; Based on the three-dimensional models, flow field simulation of the pressure relief channel of the battery is performed to obtain the safety performance parameters corresponding to the thickness of each side patch. The pressure relief channel includes a gas channel connecting the inside of the battery to the explosion-proof valve. The safety performance parameters are used to characterize the safety performance of the battery. Based on the safety performance parameters corresponding to the thickness of each side patch, a mapping relationship between the side patch thickness and the safety performance parameters is constructed; Based on the mapping relationship and the required safety performance parameters, the thickness of the target side patch is determined.

8. The determination method according to claim 7, characterized in that, The safety performance parameters include the gas pressure and gas flow velocity at the explosion-proof valve. Based on each of the three-dimensional models, flow field simulation of the battery's pressure relief channel is performed to obtain the safety performance parameters corresponding to the thickness of each side patch, including: The gas in the pressure relief channel is given physical property parameters, which include at least one of the following: gas density, dynamic viscosity coefficient, specific heat capacity, and thermal conductivity. The boundary conditions of the pressure relief channel are set, including setting the flow boundary parameters of the flow inlet and setting the pressure boundary parameters of the pressure outlet of the pressure relief channel. The flow inlet is the explosion-proof valve, and the flow boundary parameters are determined based on the gas generation test results of battery thermal runaway. Pressure field calculations were performed on the pressure relief channel to obtain the gas pressure and gas velocity at the explosion-proof valve.

9. The determining method according to claim 7 or 8, characterized in that, The safety performance parameters include the gas pressure and gas flow rate at the explosion-proof valve. The process of constructing a mapping relationship between the side patch thickness and the safety performance parameters based on the thickness of each side patch includes: Based on the gas pressure corresponding to each of the side patches, a first mapping relationship between the gas pressure and the thickness of the side patch is constructed. Based on the gas flow rate corresponding to each of the side patches, a second mapping relationship between the gas flow rate and the thickness of the side patch is constructed.

10. The determination method according to claim 9, characterized in that, The step of constructing a mapping relationship between the thickness of the side patch and the safety performance parameters based on the safety performance parameters corresponding to each of the side patches includes: The mapping relationship is generated by fitting the least squares method and the safety performance parameters corresponding to the thickness of each side patch.

11. The determination method according to claim 9, characterized in that, The safety performance parameters include the gas pressure and gas flow rate at the explosion-proof valve. Determining the target side patch thickness based on the mapping relationship and the required safety performance parameters includes: Based on the first mapping relationship and the required gas pressure, the thickness of the first side patch is determined; Based on the second mapping relationship and the required gas flow rate, the thickness of the second side patch is determined; The larger of the first side patch thickness and the second side patch thickness is determined as the target side patch thickness.

12. An electronic device, characterized in that, The electronic device includes a processor and a memory, the memory storing a computer program, and the processor executing the method for determining the thickness of the side patch according to any one of claims 7-11 by calling the computer program stored in the memory.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program adapted for loading by a processor to perform the method for determining the thickness of the side patch as described in any one of claims 7-11.

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