Selection method and device of short circuit protection structure of battery cell and battery cell system

Abstract

The application provides a selection method and device of a short-circuit protection structure of an electric core and an electric core system. The method comprises the following steps: acquiring a longest collection loop, wherein the longest collection loop is the longest loop in a plurality of collection loops, the electric core is electrically connected with the short-circuit protection structure, and the short-circuit protection structure is electrically connected with an external information collector of the electric core; and at least according to the longest collection loop, the performance parameter of a fuse of the short-circuit protection structure is determined. Through the determination of the performance parameter of the fuse of the short-circuit protection structure, a suitable fuse is selected, and the situation that the collection loop cannot be disconnected, the temperature continuously rises and exceeds the tolerance temperature of the collection loop, and the safety risk of fire occurs is prevented. Because the performance parameter of the fuse of the short-circuit protection structure is determined according to the longest collection loop, the selection effect of the fuse is improved, and the problem that the selection effect of the fuse of the short-circuit protection structure is poor in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of battery cell protection technology, and more specifically, to a method, apparatus, computer-readable storage medium, and battery cell system for selecting a short-circuit protection structure for a battery cell. Background Technology

[0002] During handling or while driving, the battery may be subjected to external forces such as vibration, impact, or collision, which may cause the external acquisition circuit of the module to short-circuit.

[0003] When the external sampling circuit of the battery cell is short-circuited, a short-circuit protection structure needs to be designed to prevent the sampling circuit from failing to disconnect when a short circuit occurs, causing the temperature to rise continuously and exceed the circuit's tolerance temperature, which could lead to safety risks such as fire. However, the existing selection method is relatively simple, resulting in poor performance of the short-circuit protection structure. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, computer-readable storage medium, and battery cell system for selecting short-circuit protection structures for battery cells, so as to solve the problem of poor selection effect of fuses in existing short-circuit protection structures.

[0005] According to one aspect of the present invention, a method for selecting a short-circuit protection structure for a battery cell is provided. The short-circuit protection structure includes multiple acquisition circuits. The method includes: obtaining the longest acquisition circuit, wherein the longest acquisition circuit is the longest circuit among the multiple acquisition circuits, the battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to an external information acquisition device of the battery cell; and determining the performance parameters of the fuse of the short-circuit protection structure based at least on the longest acquisition circuit.

[0006] Optionally, before determining the performance parameters of the fuse of the short-circuit protection structure based at least on the longest acquisition circuit, the method further includes: determining the maximum impedance based on the longest acquisition circuit, the maximum impedance being used to characterize the sum of the impedances of all components on the longest acquisition circuit.

[0007] Optionally, the longest acquisition loop includes two lines, namely a first acquisition line and a second acquisition line. The first acquisition line is used to acquire the voltage of a single battery cell, and the second acquisition line is used to acquire the voltage of multiple battery cells connected in parallel. In the process of determining the maximum impedance based on the longest acquisition loop, the method further includes: determining the loop spacing based on the electrical clearance between the first acquisition line and the second acquisition line and the creepage distance between the first acquisition line and the second acquisition line. The electrical clearance is the shortest distance measured along the air between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing, and the creepage distance is the shortest distance measured along the insulating surface between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing.

[0008] Optionally, the trace width and trace thickness are set according to the external dimensions and impedance requirements of the circuit board structure, and the maximum impedance is determined using a PCB stack-up impedance calculation tool. The short-circuit protection structure is installed on the circuit board structure, and the PCB stack-up impedance calculation tool is Polar9001.

[0009] Optionally, determining the performance parameters of the fuse in the short-circuit protection structure, at least based on the longest acquisition circuit, includes: determining the minimum short-circuit current based on the maximum impedance; obtaining test results, wherein the test results are used to characterize the test results obtained by performing fusing tests using fuses of different specifications based on the minimum short-circuit current; constructing a comparison table based on the test results, wherein the comparison table is used to characterize the relationship between the performance parameters of the fuse and the fusing time; and determining the performance parameters of the fuse based on the comparison table, wherein the performance parameters of the fuse include the length, width, thickness, and set line width of the fuse.

[0010] Optionally, the performance parameters of the fuse may also include internal resistance and copper thickness.

[0011] Optionally, the short-circuit protection structure includes multiple resistor modules and multiple voltage acquisition lines, with one resistor module electrically connected to one voltage acquisition line.

[0012] According to another aspect of the present invention, a selection device for a short-circuit protection structure of a battery cell is also provided. The device includes an acquisition unit and a determination unit. The acquisition unit is used to acquire the longest acquisition loop, wherein the longest acquisition loop is the longest loop among multiple acquisition loops. The battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to an external information collector of the battery cell. The short-circuit protection structure includes multiple acquisition loops. The determination unit determines the performance parameters of the fuse of the short-circuit protection structure based at least on the longest acquisition loop.

[0013] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes any of the methods for determining the short-circuit protection structure described above.

[0014] According to another aspect of the present invention, a battery cell system is also provided, the battery cell system including a battery cell, a circuit board structure, an external information collector for the battery cell, and a controller. A short-circuit protection structure is installed on the circuit board structure. The battery cell, the circuit board structure, and the external information collector for the battery cell are electrically connected in sequence. The controller communicates with the external information collector for the battery cell. The controller is used to execute any of the methods for selecting the short-circuit protection structure of the battery cell.

[0015] In this embodiment of the invention, by determining the performance parameters of the fuse in the short-circuit protection structure, a suitable fuse can be selected, thereby preventing situations where the acquisition circuit cannot be disconnected during a short circuit, the temperature continues to rise beyond the circuit's tolerance temperature, and there is a risk of fire. It is precisely because the performance parameters of the fuse in the short-circuit protection structure are determined based on the longest acquisition circuit that the fuse selection effect is improved, solving the problem of poor fuse selection effect in the existing short-circuit protection structure. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A flowchart illustrating a method for selecting a short-circuit protection structure for a battery cell according to an embodiment of this application is shown;

[0018] Figure 2 A schematic diagram of a selection device for a short-circuit protection structure of a battery cell according to an embodiment of this application is shown. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Furthermore, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0023] As mentioned in the background section, the existing selection methods are relatively simple, resulting in poor performance of the short-circuit protection structure. In order to solve the problem of poor selection performance of fuses in the existing short-circuit protection structure, this application provides a typical embodiment of a method, apparatus, computer-readable storage medium, and battery cell system for selecting a short-circuit protection structure for a battery cell.

[0024] According to an embodiment of this application, a method for selecting a short-circuit protection structure for a battery cell is provided, wherein the short-circuit protection structure includes multiple acquisition circuits.

[0025] Figure 1 This is a flowchart illustrating the selection method for the short-circuit protection structure of a battery cell according to an embodiment of this application. For example... Figure 1 As shown, the method includes the following steps:

[0026] Step S101: Obtain the longest acquisition loop, wherein the longest acquisition loop is the longest loop among the multiple acquisition loops, the battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to the external information acquisition device of the battery cell.

[0027] Specifically, the longest acquisition loop is selected from the multiple acquisition loops mentioned above.

[0028] In one embodiment of this application, before determining the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition loop, the method further includes: determining the maximum impedance based on the longest acquisition loop, wherein the maximum impedance is used to characterize the sum of the impedances of all components on the longest acquisition loop. This is because the impedance of the longest acquisition loop is the largest among multiple acquisition loops.

[0029] In one embodiment of this application, the longest acquisition loop includes two lines, namely a first acquisition line and a second acquisition line. The first acquisition line is used to acquire the voltage of a single battery cell, and the second acquisition line is used to acquire the voltage of multiple battery cells connected in parallel. In the process of determining the maximum impedance based on the longest acquisition loop, the method further includes: determining the loop spacing based on the electrical clearance between the first acquisition line and the second acquisition line and the creepage distance between the first acquisition line and the second acquisition line. The electrical clearance is the shortest distance measured along the air between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing, and the creepage distance is the shortest distance measured along the insulating surface between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing.

[0030] Specifically, after determining the circuit spacing, the spacing between the first and second acquisition lines corresponding to all acquisition circuits is set to the circuit spacing value, thereby improving the protection effect of the short-circuit protection structure on the battery cell.

[0031] In one embodiment of this application, the trace width and trace thickness are set according to the external dimensions of the circuit board structure and the impedance requirements. A PCB stack-up impedance calculation tool is used to determine the maximum impedance. The circuit board structure includes the aforementioned short-circuit protection structure. The PCB stack-up impedance calculation tool is Polar9001. The trace thickness for impedance requirements refers to the thickness of the traces in the acquisition loop on the circuit board structure.

[0032] Specifically, the external dimensions of the circuit board structure, including its length, width, and thickness, are comprehensively considered, thereby improving the accuracy of the maximum impedance calculation and consequently enhancing the accuracy of selecting the performance parameters of the fuses for subsequent short-circuit protection. The effects of temperature on resistance and the etching process on accuracy are also taken into account.

[0033] Step S102: Determine the performance parameters of the fuse in the above-mentioned short-circuit protection structure based at least on the longest acquisition circuit.

[0034] In the above steps, by determining the performance parameters of the fuse in the short-circuit protection structure, a suitable fuse is selected. This prevents situations where the acquisition circuit cannot be disconnected during a short circuit, leading to continuous temperature rise exceeding the circuit's withstand temperature and posing a fire risk. Because the performance parameters of the fuse in the short-circuit protection structure are determined based on the longest acquisition circuit, the fuse selection effect is improved, solving the problem of poor fuse selection in existing short-circuit protection structures. Following the performance parameters of the fuse in the short-circuit protection structure, impedance calculations for circuit matching are performed to verify that the fuse can effectively protect the battery cell.

[0035] In one embodiment of this application, determining the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition circuit includes: determining the minimum short-circuit current based on the maximum impedance; obtaining test results, wherein the test results are used to characterize the test results obtained by performing fusing tests using fuses of different specifications based on the minimum short-circuit current; constructing a comparison table based on the test results, as shown in Table 1, the comparison table being used to characterize the relationship between the fuse performance parameters and the fusing time; determining the fuse performance parameters based on the comparison table, the fuse performance parameters including the fuse's length, width, thickness, and set line width. Based on the current and fusing time meeting the circuit short-circuit protection requirements, determining the fuse specification range, incorporating the internal resistance of fuses meeting the fusing characteristics into the internal resistance calculation of the acquisition circuit, and selecting the fuse with the largest set line width.

[0036] Table 1: Comparison Table

[0037]

[0038]

[0039] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0040] In one embodiment of this application, the performance parameters of the fuse also include internal resistance and copper thickness.

[0041] In one embodiment of this application, the short-circuit protection structure includes multiple resistor modules and multiple voltage acquisition lines, with one resistor module electrically connected to one voltage acquisition line. This protects the battery cell. For example, there are four battery cells: a first cell, a second cell, a third cell, and a fourth cell. The first cell serves as a first cell unit, and the second, third, and fourth cells are connected in parallel to form a second cell unit. In this case, the first acquisition line in the longest acquisition loop is used to acquire the voltage of the first cell unit, and the second acquisition line is used to acquire the voltage of the second cell unit.

[0042] This application also provides a device for selecting a short-circuit protection structure for a battery cell. It should be noted that this device can be used to execute the method for selecting a short-circuit protection structure for a battery cell provided in this application. The following describes the device for selecting a short-circuit protection structure for a battery cell provided in this application.

[0043] Figure 2This is a schematic diagram of a selection device for a short-circuit protection structure of a battery cell according to an embodiment of this application. For example... Figure 2 As shown, the device includes an acquisition unit 10 and a determination unit 20; the acquisition unit 10 is used to acquire the longest acquisition loop, wherein the longest acquisition loop is the longest loop among multiple acquisition loops, the battery cell is electrically connected to a short-circuit protection structure, the short-circuit protection structure is electrically connected to an external information collector of the battery cell, and the short-circuit protection structure includes multiple acquisition loops; the determination unit 20 determines the performance parameters of the fuse of the short-circuit protection structure based at least on the longest acquisition loop.

[0044] In the aforementioned device, by determining the performance parameters of the fuse in the short-circuit protection structure, a suitable fuse can be selected. This prevents situations where the acquisition circuit cannot be disconnected during a short circuit, leading to continuous temperature rise exceeding the circuit's withstand temperature and posing a fire risk. Because the performance parameters of the fuse in the short-circuit protection structure are determined based on the longest acquisition circuit, the fuse selection effect is improved, solving the problem of poor fuse selection in existing short-circuit protection structures. After determining the performance parameters of the fuse in the short-circuit protection structure, impedance calculations for circuit matching are performed to verify that the fuse can effectively protect the battery cell.

[0045] In one embodiment of this application, the device further includes a processing unit. Before determining the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition loop, the first processing unit is used to determine the maximum impedance based on the longest acquisition loop. The maximum impedance is used to characterize the sum of the impedances of all components on the longest acquisition loop, because the impedance of the longest acquisition loop is the largest among multiple acquisition loops.

[0046] In one embodiment of this application, the longest acquisition loop includes two lines, namely a first acquisition line and a second acquisition line. The first acquisition line is used to acquire the voltage of a single battery cell, and the second acquisition line is used to acquire the voltage of multiple battery cells connected in parallel. The processing unit includes a first processing module. In the process of determining the maximum impedance based on the longest acquisition loop, the first processing module is used to determine the loop spacing based on the electrical clearance between the first acquisition line and the second acquisition line and the creepage distance between the first acquisition line and the second acquisition line. The electrical clearance is the shortest distance measured along the air between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing, and the creepage distance is the shortest distance measured along the insulating surface between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing.

[0047] Specifically, after determining the circuit spacing, the spacing between the first and second acquisition lines corresponding to all acquisition circuits is set to the circuit spacing value, thereby improving the protection effect of the short-circuit protection structure on the battery cell.

[0048] In one embodiment of this application, the processing unit includes a second processing module. The second processing module is used to set the line width and the line thickness according to the external dimensions of the circuit board structure and the impedance requirements, and to determine the maximum impedance using a PCB stack-up impedance calculation tool. The circuit board structure is equipped with the short-circuit protection structure, and the PCB stack-up impedance calculation tool is Polar9001.

[0049] Specifically, the external dimensions of the circuit board structure, including its length, width, and thickness, are comprehensively considered, thereby improving the accuracy of the maximum impedance calculation and consequently enhancing the accuracy of selecting the performance parameters of the fuses for subsequent short-circuit protection. The effects of temperature on resistance and the etching process on accuracy are also taken into account.

[0050] In one embodiment of this application, the determining unit includes a first determining module, an acquiring module, a constructing module, and a second determining module. The first determining module is used to determine the minimum short-circuit current based on the maximum impedance. The acquiring module is used to acquire test results, wherein the test results are used to characterize the test results obtained by performing fusing tests using fuses of different specifications based on the minimum short-circuit current. The constructing module is used to construct a comparison table based on the test results, as shown in Table 1. The comparison table is used to characterize the relationship between the performance parameters of the fuse and the fusing time. The second determining module is used to determine the performance parameters of the fuse based on the comparison table. The performance parameters of the fuse include the length, width, thickness, and set line width of the fuse.

[0051] In one embodiment of this application, the performance parameters of the fuse also include internal resistance and copper thickness.

[0052] In one embodiment of this application, the short-circuit protection structure includes multiple resistor modules and multiple voltage acquisition lines, with one resistor module electrically connected to one voltage acquisition line.

[0053] The device for selecting the short-circuit protection structure of the aforementioned battery cell includes a processor and a memory. The aforementioned acquisition unit and determination unit are all stored in the memory as program units, and the processor executes the aforementioned program units stored in the memory to realize the corresponding functions.

[0054] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the poor performance of fuse selection in existing short-circuit protection structures.

[0055] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0056] This invention provides a computer-readable storage medium storing a program that, when executed by a processor, implements the above-mentioned method for selecting a short-circuit protection structure for a battery cell.

[0057] This invention provides a processor for running a program, wherein the program executes a method for selecting a short-circuit protection structure for a battery cell.

[0058] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps: obtaining the longest acquisition loop, wherein the longest acquisition loop is the longest among multiple acquisition loops; the battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to an external information collector of the battery cell; and determining the performance parameters of the fuse of the short-circuit protection structure, at least based on the longest acquisition loop. The device described herein can be a server, PC, PAD, mobile phone, etc.

[0059] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps: obtaining the longest acquisition loop, wherein the longest acquisition loop is the longest among a plurality of acquisition loops, the battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to an external information acquisition device of the battery cell; and determining the performance parameters of the fuse of the short-circuit protection structure based at least on the longest acquisition loop.

[0060] This application also provides a battery cell system, which includes a battery cell, a circuit board structure, an external information collector for the battery cell, and a controller. A short-circuit protection structure is installed on the circuit board structure. The battery cell, the circuit board structure, and the external information collector for the battery cell are electrically connected in sequence. The controller communicates with the external information collector for the battery cell. The controller is used to execute any of the above-mentioned methods for selecting the short-circuit protection structure for the battery cell.

[0061] To enable those skilled in the art to better understand the technical solution of this application, the technical solution and technical effects of this application will be described below in conjunction with specific embodiments.

[0062] Example

[0063] This application also provides a selection scheme for a short-circuit protection structure for a battery cell. The short-circuit protection structure includes multiple acquisition circuits, and the scheme includes the following steps:

[0064] Step 1: Obtain the longest acquisition loop, where the longest acquisition loop is the longest among multiple acquisition loops. The battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to the external information acquisition device of the battery cell.

[0065] Step 2: The longest acquisition loop mentioned above includes two lines, namely the first acquisition line and the second acquisition line. The first acquisition line is used to acquire the voltage of a single battery cell, and the second acquisition line is used to acquire the voltage of multiple battery cells connected in parallel. The loop spacing is determined based on the electrical clearance and creepage distance between the first and second acquisition lines. The electrical clearance is the shortest distance measured along the air between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing. The creepage distance is the shortest distance measured along the insulating surface between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing. The line width and line thickness are set according to the external dimensions and impedance requirements of the circuit board structure. The maximum impedance is determined using Polar9001. The short-circuit protection structure is installed on the circuit board structure.

[0066] Step 3: Determine the minimum short-circuit current based on the maximum impedance mentioned above; obtain the test results, which are used to characterize the test results obtained by using fuses of different specifications to conduct fusing tests based on the minimum short-circuit current; construct a comparison table based on the test results, as shown in Table 1, which is used to characterize the relationship between the performance parameters of the fuse and the fusing time; determine the performance parameters of the fuse based on the comparison table, which include the length, width, thickness and set line width of the fuse;

[0067] Step 4: Based on the performance parameters of the fuse, perform impedance calculation and verification for circuit matching to determine whether the fuse can function to protect the battery cell.

[0068] By determining the performance parameters of the fuse in the aforementioned short-circuit protection structure, a suitable fuse can be selected, thus preventing situations where the acquisition circuit cannot be disconnected during a short circuit, leading to continuous temperature rise exceeding the circuit's withstand temperature and posing a fire risk. Because the performance parameters of the fuse in the aforementioned short-circuit protection structure are determined based on the longest acquisition circuit, the fuse selection effect is improved, solving the problem of poor fuse selection in existing short-circuit protection structures. Following the performance parameters of the fuse in the aforementioned short-circuit protection structure, impedance calculations for circuit matching are performed to verify that the fuse can effectively protect the battery cell.

[0069] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0070] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units described above can be 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 units or modules may be electrical or other forms.

[0071] The units described above 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 units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0072] Furthermore, the functional units in the various embodiments of the present invention 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. The integrated unit can be implemented in hardware or as a software functional unit.

[0073] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part 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 a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0074] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0075] 1) The method for selecting the short-circuit protection structure of the battery cell in this application determines the performance parameters of the fuse in the short-circuit protection structure, thereby selecting a suitable fuse. This prevents the situation where the acquisition circuit cannot be disconnected during a short circuit, the temperature continues to rise beyond the circuit's withstand temperature, and there is a risk of fire. It is precisely because the performance parameters of the fuse in the short-circuit protection structure are determined based on the longest acquisition circuit that the fuse selection effect is improved, and the problem of poor fuse selection effect in the existing short-circuit protection structure is solved.

[0076] 2) The short-circuit protection structure selection device for the battery cell of this application selects a suitable fuse by determining the performance parameters of the fuse of the short-circuit protection structure. This prevents the acquisition circuit from failing to disconnect during a short circuit, causing the temperature to rise continuously beyond the circuit's withstand temperature, thus posing a fire risk. Because the performance parameters of the fuse of the short-circuit protection structure are determined based on the longest acquisition circuit, the fuse selection effect is improved, solving the problem of poor fuse selection effect in the existing short-circuit protection structure.

[0077] 3) The battery cell system of this application selects a suitable fuse by determining the performance parameters of the fuse in the short-circuit protection structure, thereby preventing the acquisition circuit from failing to disconnect during a short circuit, causing the temperature to rise continuously beyond the circuit's tolerance temperature, and posing a fire risk. It is precisely because the performance parameters of the fuse in the short-circuit protection structure are determined based on the longest acquisition circuit that the fuse selection effect is improved, solving the problem of poor fuse selection effect in the existing short-circuit protection structure.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for selecting a short-circuit protection structure for a battery cell, characterized in that, The short-circuit protection structure includes multiple data acquisition circuits, including: The longest acquisition loop is obtained, wherein the longest acquisition loop is the longest among multiple acquisition loops, the battery cell is electrically connected to the short-circuit protection structure, and the short-circuit protection structure is electrically connected to the external information acquisition device of the battery cell; Determine the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition circuit. Before determining the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition loop, the method further includes: determining the maximum impedance based on the longest acquisition loop, the maximum impedance being used to characterize the sum of the impedances of all components on the longest acquisition loop. The longest acquisition loop includes two lines, namely a first acquisition line and a second acquisition line. The first acquisition line is used to acquire the voltage of a single battery cell, and the second acquisition line is used to acquire the voltage of multiple battery cells connected in parallel. In the process of determining the maximum impedance based on the longest acquisition loop, the method further includes: determining the loop spacing based on the electrical clearance between the first acquisition line and the second acquisition line and the creepage distance between the first acquisition line and the second acquisition line. The electrical clearance is the shortest distance measured along the air between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing, and the creepage distance is the shortest distance measured along the insulating surface between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing. After determining the loop spacing, the spacing between the first acquisition line and the second acquisition line corresponding to all acquisition loops is set to the value of the loop spacing.

2. The method according to claim 1, characterized in that, Based on the longest acquisition loop, determine the maximum impedance, including: The trace width and trace thickness are set according to the external dimensions and impedance requirements of the circuit board structure. The maximum impedance is determined using a PCB stack-up impedance calculation tool. The circuit board structure is equipped with the short-circuit protection structure. The PCB stack-up impedance calculation tool is Polar9001.

3. The method according to claim 1, characterized in that, Determine the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition circuit, including: Determine the minimum short-circuit current based on the maximum impedance; Obtain test results, wherein the test results are used to characterize the test results obtained by conducting fusing tests using fuses of different specifications based on the minimum short-circuit current; Based on the test results, a comparison table was constructed to characterize the relationship between the performance parameters of the fuse and the fusing time. According to the reference table, the performance parameters of the fuse are determined, including the fuse's length, width, thickness, and set line width.

4. The method according to claim 3, characterized in that, The performance parameters of the fuse also include internal resistance and copper thickness.

5. The method according to any one of claims 1 to 4, characterized in that, The short-circuit protection structure includes multiple resistor modules and multiple voltage acquisition lines, with one resistor module electrically connected to one voltage acquisition line.

6. A selection device for a short-circuit protection structure of a battery cell, characterized in that, include: An acquisition unit is used to acquire the longest acquisition loop, wherein the longest acquisition loop is the longest loop among multiple acquisition loops, the battery cell is electrically connected to a short-circuit protection structure, the short-circuit protection structure is electrically connected to an external information acquisition device of the battery cell, and the short-circuit protection structure includes multiple acquisition loops; The unit determines the performance parameters of the fuse in the short-circuit protection structure, based at least on the longest acquisition circuit. The device further includes a processing unit for determining, before determining the performance parameters of the fuse in the short-circuit protection structure based at least on the longest acquisition circuit, the maximum impedance being used to characterize the sum of the impedances of all components on the longest acquisition circuit. The longest acquisition loop includes two lines, namely a first acquisition line and a second acquisition line. The first acquisition line is used to acquire the voltage of a single battery cell, and the second acquisition line is used to acquire the voltage of multiple battery cells connected in parallel. The processing unit includes a first processing module. In the process of determining the maximum impedance based on the longest acquisition loop, the first processing module is used to determine the loop spacing based on the electrical clearance between the first acquisition line and the second acquisition line and the creepage distance between the first acquisition line and the second acquisition line. The electrical clearance is the shortest distance measured along the air between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing, and the creepage distance is the shortest distance measured along the insulating surface between two adjacent semiconductors or a conductor and the surface of an adjacent motor housing. After determining the loop spacing, the spacing between the first acquisition line and the second acquisition line corresponding to all acquisition loops is set to the value of the loop spacing.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program executes the method for selecting a short-circuit protection structure according to any one of claims 1 to 5.

8. A battery cell system, characterized in that, include: The battery cell, circuit board structure, external information collector for the battery cell, and controller are provided. A short-circuit protection structure is installed on the circuit board structure. The battery cell, the circuit board structure, and the external information collector for the battery cell are electrically connected in sequence. The controller communicates with the external information collector for the battery cell. The controller is used to execute the selection method for the short-circuit protection structure of the battery cell according to any one of claims 1 to 5.

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