A method and device for designing the fuse of a battery connector

Abstract

This invention discloses a method and apparatus for designing the fuse of a battery connector. The method includes: constructing an overcurrent thermal simulation model; applying a preset current to the overcurrent thermal simulation model and calculating its temperature field; determining the local overheating location and heat transfer direction of the battery connector based on the temperature field; and determining the fuse location of the connector based on the local overheating location and heat transfer direction. This method achieves the following: by constructing an overcurrent simulation model of the connector and calculating its temperature field, determining the local overheating location and heat transfer direction of the battery connector based on the temperature field, and then determining the fuse location based on the local overheating location and heat transfer direction, the fuse can be shortened while ensuring fuse effectiveness, accelerating the fuse process, and improving fuse efficiency. Furthermore, by shortening the fuse time, the battery can be prevented from being in an overheated state for an extended period, thereby improving battery safety.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of battery system management, and in particular to a method and device for designing the fusing of a battery connector. Background Art

[0002] At present, the main failure mode of external short circuit of batteries is the fuse of the connecting piece, which requires fuse design for the connecting piece. However, the existing fuse design method cannot accurately determine the position and size of the opening or slot to ensure the effectiveness of the fuse design, and requires a large number of experiments for short circuit verification, which is inefficient and has low accuracy. Summary of the invention

[0003] The present invention provides a method and device for designing the fusing of a battery connecting piece, so as to ensure the effectiveness of the fusing design of the battery connecting piece, shorten the fusing time and improve the safety of the battery.

[0004] In a first aspect, an embodiment of the present invention provides a method for designing a fuse for a battery connecting piece, the method comprising: constructing an overcurrent thermal simulation model; applying a preset current to the overcurrent thermal simulation model, and calculating the temperature field of the overcurrent thermal simulation model; determining a local overheating position and a heat transfer direction of the battery connecting piece according to the temperature field; and determining the fuse position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece.

[0005] Optionally, the calculating the temperature field of the over-current thermal simulation model includes:

[0006] The temperature field of the over-current thermal simulation model is calculated using a numerical heat transfer method.

[0007] Optionally, determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field includes:

[0008] The local overheating position of the battery connecting piece is determined according to the temperature mark of the temperature field; and the heat transfer direction is determined according to the temperature mark of the temperature field and the local overheating position.

[0009] Optionally, determining the fusing position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece includes:

[0010] Determining a first fusing position and a second fusing position of the connecting piece according to a local overheating position and a heat transfer direction of the battery connecting piece;

[0011] Performing an opening or a hole-forming process on the first fuse position;

[0012] The second fuse position is subjected to a fuse processing.

[0013] Optionally, determining the first fusing position and the second fusing position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece includes:

[0014] When the local overheating position is located at the edge of the connecting piece and the heat transfer direction is from the edge to the middle position, the middle position of the connecting piece is used as the first fuse position and the edge of the connecting piece is used as the second fuse position.

[0015] Optionally, determining the first fusing position and the second fusing position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece includes:

[0016] When the local overheating position is located in the middle position of the connecting piece and the heat transfer direction is from the middle position to the edge position, the edge position of the connecting piece is used as the first fuse position and the middle position is used as the second fuse position.

[0017] Optionally, before building the over-current thermal simulation model, the following is also included:

[0018] Constructing a geometric model of the battery connecting piece;

[0019] The physical parameters of the battery connecting piece are configured in the geometric model in combination with finite element software.

[0020] Optionally, the physical parameters of the battery connecting sheet include at least: density, specific heat capacity, thermal conductivity and electrical conductivity of the connecting sheet material.

[0021] In a second aspect, an embodiment of the present invention further provides a fuse design device for a battery connector, the fuse design device for a battery connector comprising:

[0022] Model building module, used to build over-current thermal simulation model;

[0023] A temperature field calculation module, used for applying a preset current to the overcurrent thermal simulation model and calculating the temperature field of the overcurrent thermal simulation model;

[0024] A local overheating position and heat transfer direction determination module, used to determine the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field;

[0025] The fusing position determining module is used to determine the fusing position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece.

[0026] Optionally, the fuse position determination module is further used for:

[0027] Determining a first fusing position and a second fusing position of the connecting piece according to a local overheating position and a heat transfer direction of the battery connecting piece;

[0028] Performing an opening or a hole-forming process on the first fuse position;

[0029] The second fuse position is subjected to a fuse processing.

[0030] The present invention provides a method and device for designing the fuse of a battery connecting piece. The method includes: constructing an overcurrent thermal simulation model; applying a preset current to the overcurrent thermal simulation model and calculating the temperature field of the overcurrent thermal simulation model; determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field; and determining the fuse position of the connecting piece according to the local overheating position and heat transfer direction of the battery connecting piece. This method can achieve: by constructing an overcurrent simulation model of the connecting piece and calculating the temperature field, determining the local overheating position and heat transfer direction of the battery connecting piece through the temperature field, and then determining its fuse position according to the local overheating position and heat transfer direction of the battery connecting piece, the fuse time of the connecting piece can be shortened while ensuring the effectiveness and accuracy of the fuse, the fuse process of the connecting piece can be accelerated, and the fuse efficiency can be improved. Moreover, due to the shortened fuse time, the battery can be prevented from being in an overheated state for a long time to cause safety problems, thereby improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of a method for designing a fuse of a battery connecting piece in the first embodiment of the present invention;

[0032] Figure 2 It is a flow chart of a method for designing a fuse of a battery connecting piece in the second embodiment of the present invention;

[0033] Figure 3 It is a flow chart of a method for designing a fuse of a battery connecting piece in Embodiment 3 of the present invention;

[0034] Figure 4 It is a structural schematic diagram of a fuse position in the third embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of a structure after a hole opening process in Embodiment 3 of the present invention;

[0036] Figure 6 It is a flow chart of a method for designing a fuse of a battery connecting piece in a fourth embodiment of the present invention;

[0037] Figure 7 It is a structural schematic diagram of a fuse position in the fourth embodiment of the present invention;

[0038] Figure 8This is a schematic diagram of a structure after opening processing in Embodiment 4 of the present invention;

[0039] Fig. 9 It is a structural block diagram of a fuse design device for a battery connecting piece in the fifth embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] Embodiment 1

[0042] Figure 1 Flow chart of a method for designing a fuse for a battery connector provided in Embodiment 1 of the present invention. This embodiment can be applied to a method for designing a fuse for a battery connector, which can speed up the fusing process and improve the fusing efficiency. This method can be executed by a device for designing a fuse for a battery connector. Figure 1 , specifically including the following steps:

[0043] Step 110, constructing an over-current thermal simulation model;

[0044] Specifically, an overcurrent thermal simulation model of the battery connecting piece can be built according to the structure of the battery connecting piece in combination with finite element calculation software.

[0045] Step 120: applying a preset current to the overcurrent thermal simulation model, and calculating the temperature field of the overcurrent thermal simulation model;

[0046] Specifically, a current boundary is applied to the overcurrent thermal simulation model according to a preset current, so that the simulation model of the battery connecting piece undergoes an overcurrent thermal change under the action of the current, and then the temperature field of the overcurrent thermal simulation model is calculated.

[0047] The preset current is the current value when an overcurrent occurs in the battery connecting piece, and its specific value can be set according to actual conditions and is not specifically limited here.

[0048] Step 130: determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field;

[0049] Among them, the temperature field calculated according to the overcurrent thermal simulation model can show the temperature and temperature change trend of each area of ​​the battery connector. Among them, the local overheating position of the battery connector refers to the area with the highest temperature on the temperature field of the battery connector, and the number may be one or more. The heat transfer direction refers to the direction in which the temperature or heat is transferred from the high temperature area to the low temperature area on the battery connector.

[0050] Step 140: Determine the fusing position of the battery connecting piece according to the local overheating position and the heat transfer direction of the connecting piece.

[0051] Since the local overheating position and the heat transfer direction represent the highest temperature area of ​​the battery connector and the heat transfer direction or the temperature change trend respectively, in order to speed up the fusing process of the connector while ensuring the effectiveness of the fusing and improve the fusing efficiency, the fusing position of the connector is determined according to the local overheating position and the heat transfer direction of the battery connector.

[0052] In the technical solution of this embodiment, the working principle of the fuse design method of the battery connecting piece is: Figure 1 First, an overcurrent thermal simulation model is constructed; then, a preset current is applied to the overcurrent thermal simulation model, and the temperature field of the overcurrent thermal simulation model is calculated; the local overheating position and heat transfer direction of the battery connecting piece are determined according to the temperature field; the fuse position of the connecting piece is determined according to the local overheating position and heat transfer direction of the battery connecting piece. Thus, by determining the fuse position of the connecting piece according to the local overheating position and heat transfer direction of the battery connecting piece, the fuse time of the connecting piece can be shortened while ensuring the effectiveness of the fuse, the fuse process can be accelerated, and the fuse efficiency can be improved. Moreover, due to the shortened fuse time, the battery can be prevented from being in an overheated state for a long time to cause safety problems, thereby improving the safety of the battery.

[0053] The technical solution of this embodiment provides a method for designing the fuse of a battery connecting piece, which includes: constructing an overcurrent thermal simulation model; applying a preset current to the overcurrent thermal simulation model and calculating the temperature field of the overcurrent thermal simulation model; determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field; and determining the fuse position of the connecting piece according to the local overheating position and heat transfer direction of the battery connecting piece. This method can achieve: by constructing an overcurrent simulation model of the connecting piece and calculating the temperature field, determining the local overheating position and heat transfer direction of the battery connecting piece through the temperature field, and then determining its fuse position according to the local overheating position and heat transfer direction of the battery connecting piece, the fuse time of the connecting piece can be shortened while ensuring the effectiveness and accuracy of the fuse, the fuse process can be accelerated, and the fuse efficiency can be improved. Moreover, due to the shortened fuse time, the battery can be prevented from being in an overheated state for a long time to cause safety problems, thereby improving the safety of the battery.

[0054] On the basis of the above technical solution, optionally, calculating the temperature field of the over-current thermal simulation model includes:

[0055] The temperature field of the flow thermal simulation model is calculated using numerical heat transfer methods.

[0056] Among them, numerical heat transfer, also known as computational heat transfer, refers to an interdisciplinary subject that combines heat transfer and numerical methods to solve the control equations describing flow and heat transfer problems by using numerical methods and computers. The basic idea of ​​numerical heat transfer is to replace the field of physical quantities that are originally continuous in space and time coordinates, such as the temperature field, with a set of values ​​at a finite number of discrete points, and to establish algebraic equations (called discrete equations) that represent the relationship between the values ​​of these discrete point variables through certain principles. Solve the established algebraic equations to obtain approximate values ​​of the variables to be solved.

[0057] Optionally, determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field includes: determining the local overheating position of the battery connecting piece according to the temperature mark of the temperature field; determining the heat transfer direction according to the temperature mark and the local overheating position of the temperature field.

[0058] Among them, the temperature mark can be a color mark. For example, the mark can be set to the depth of the color according to the temperature, and the mark can be set to the depth of the color according to the temperature change trend. For example, the mark corresponding to the high temperature value is set to a dark color, such as dark red; the mark corresponding to the low temperature value is set to a light color, such as light yellow. This is just an exemplary description. The specific temperature value can be set according to the actual situation. No specific limitation is made here.

[0059] Optionally, before building the over-current thermal simulation model, the following is also included:

[0060] Construct the geometric model of the battery connector;

[0061] The physical parameters of the battery connector are configured in the geometric model using finite element software.

[0062] Specifically, before constructing the overcurrent thermal simulation model, a geometric model of the battery connector is established according to the structure and size of the battery connector, and then imported into the finite element software; the physical parameters of various material components of the battery connector are configured in the finite element software to construct the overcurrent thermal simulation model.

[0063] It should be noted that before building the overcurrent thermal simulation model, a geometric model of the battery (structure containing the connecting piece in the battery) can also be built, and the physical parameters of the battery (including the connecting piece) can be configured in the geometric model of the battery in combination with the finite element software, and then the overcurrent thermal simulation model of the connecting piece can be established. Whether to build a geometric model of a single component of the connecting piece or to build a geometric model of the entire battery including the connecting piece can be set according to actual needs, and no specific limitation is made here.

[0064] Optionally, the physical parameters of the battery connecting sheet include at least: density, specific heat capacity, thermal conductivity and electrical conductivity of the connecting sheet material.

[0065] Among them, the density, specific heat capacity, thermal conductivity and electrical conductivity of the material used for the connecting piece can be configured in the finite element software, providing basic parameter guarantees for the subsequent application of preset current to the overcurrent thermal simulation model.

[0066] Embodiment 2

[0067] Figure 2 is a flow chart of a method for designing a fuse for a battery connector provided in the second embodiment of the present invention. Based on the above embodiment 1, optionally, refer to Figure 2 , specifically including the following steps:

[0068] Step 210, constructing an over-current thermal simulation model;

[0069] Step 220: applying a preset current to the overcurrent thermal simulation model, and calculating the temperature field of the overcurrent thermal simulation model;

[0070] Step 230, determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field;

[0071] Step 240, determining a first fusing position and a second fusing position of the connecting piece according to a local overheating position and a heat transfer direction of the battery connecting piece;

[0072] The temperature of the first fuse position of the connecting piece is lower than that of the second fuse position, and the time required to reach the melting point is longer than that required for the second fuse position. Therefore, the first fuse position and the second fuse position are first determined according to the local overheating position and the heat transfer direction of the battery connecting piece, and then the first fuse position is fused or cut off before the first fuse position reaches the temperature required for fusing, which can speed up the fusing process of the connecting piece, shorten the fusing time, and improve the fusing efficiency. Compared with the prior art that treats the first fuse position and the second fuse position as a whole and performs a melting process at one time, the first fuse position is cut off before the first fuse position reaches the temperature required for melting and before the second fuse position is melted. This can avoid the prior art that causes incomplete melting, structural deformation, damage to material properties, etc. when the first fuse position does not reach the melting temperature, and the first fuse position and the second fuse position are melted together. Therefore, the technical solution of the embodiment of the present invention can shorten the melting time of the connecting piece, speed up the melting process of the connecting piece, and improve the melting efficiency while ensuring the effectiveness and accuracy of the melting. Since the melting time is shortened, the battery can be prevented from being in an overheated state for a long time to cause safety problems, thereby improving the safety of the battery.

[0073] Step 250: perform an opening or hole processing on the first fuse position; and perform a fuse processing on the second fuse position.

[0074] The first fuse position may be cut off in a manner of: making an opening or a hole at the first fuse position. The specific size of the opening or the hole may be set according to actual conditions and is not specifically limited here.

[0075] The temperature of the second fuse position is higher than that of the first fuse position and can easily reach the fuse temperature. Therefore, after the first fuse position is opened or holed, only the second fuse position needs to be melted.

[0076] Embodiment 3

[0077] Figure 3 It is a flow chart of a method for designing a fuse of a battery connecting piece provided in the third embodiment of the present invention. Figure 4 is a structural schematic diagram of a fuse position provided in the third embodiment of the present invention, Figure 5 is a schematic diagram of a structure after a hole opening treatment provided in the third embodiment of the present invention. Based on the above embodiment, optionally, refer to Figure 3 , specifically including the following steps:

[0078] Step 310, constructing an over-current thermal simulation model;

[0079] Step 320: applying a preset current to the overcurrent thermal simulation model, and calculating the temperature field of the overcurrent thermal simulation model;

[0080] Step 330: determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field;

[0081] Step 340: when the local overheating position is located at the edge of the connecting piece, and the heat transfer direction is from the edge to the middle, the middle of the connecting piece is used as the first fusing position, and the edge of the connecting piece is used as the second fusing position;

[0082] Exemplary, reference Figure 4 and Figure 5 , shows the situation when the local overheating position is located at the edge of the connecting piece and the heat transfer direction is from the edge to the middle position. Figure 4 The temperature scale shows Figure 4 The first edge position T1 and the second edge position T2 are the areas with the highest temperature in the entire connecting piece, which are local overheating positions; the temperature at the middle position T3 between the first edge position T1 and the second edge position T2 is second, so the heat transfer direction is from the first edge position T1 to the middle position T3, and from the second edge position T2 to the middle position T3. Figure 4Thus, the middle position T3 is used as the first fuse position, and the first edge position T1 and the second edge position T2 are used as the second fuse positions.

[0083] Step 350: perform an opening or hole processing on the first fuse position; and perform a fuse processing on the second fuse position.

[0084] Exemplary, reference Figure 5 , the first fusing position, i.e. the middle position T3, is opened to obtain the opening K0. Then, the first edge position T1 and the second edge position T2 are fusing, thereby shortening the fusing time of the connecting piece while ensuring the fusing effectiveness, accelerating the fusing process of the connecting piece, and improving the fusing efficiency. Moreover, due to the shortened fusing time, the battery can be prevented from being in an overheated state for a long time and causing safety problems, thereby improving the safety of the battery.

[0085] Embodiment 4

[0086] Figure 6 is a flow chart of a method for designing a fuse for a battery connector provided in a fourth embodiment of the present invention. Figure 7 is a structural schematic diagram of a fuse position provided in the fourth embodiment of the present invention, Figure 8 is a schematic diagram of a structure after opening processing provided in the fourth embodiment of the present invention. Based on the above embodiment, optionally, refer to Figure 6 , specifically including the following steps:

[0087] Step 410, constructing an over-current thermal simulation model;

[0088] Step 420: applying a preset current to the overcurrent thermal simulation model, and calculating the temperature field of the overcurrent thermal simulation model;

[0089] Step 430: determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field;

[0090] Step 440: when the local overheating position is located in the middle position of the connecting piece, and the heat transfer direction is from the middle position to the edge position, the edge position of the connecting piece is used as the first fusing position, and the middle position is used as the second fusing position;

[0091] Exemplary, reference Figure 7 and Figure 8 , shows the situation when the local overheating position is located in the middle position of the connecting piece, and the heat transfer direction is from the middle edge position to the edge position. Figure 7 The temperature scale shows Figure 7The middle position T3 is the area with the highest temperature in the entire connecting piece, which is a local overheating position; the temperatures at the first edge position T1 and the second edge position T2 are second, so the heat transfer direction is from the middle position T3 to the first edge position T1, and from the middle position T3 to the second edge position T2. Figure 7 Thus, the first edge position T1 and the second edge position T2 are used as the first fusing position, and the middle position T3 is used as the second fusing position.

[0092] Step 450: perform an opening or hole processing on the first fuse position; and perform a fuse processing on the second fuse position.

[0093] Exemplary, reference Figure 8 , the first fusing position, i.e., the first edge position T1 and the second edge position T2, are opened to obtain the first opening K1 and the second opening K2. Then, the middle position T3 is fusing, thereby shortening the fusing time of the connecting piece while ensuring the fusing effectiveness, accelerating the fusing process of the connecting piece, and improving the fusing efficiency. Moreover, due to the shortened fusing time, the battery can be prevented from being in an overheated state for a long time and causing safety problems, thereby improving the safety of the battery.

[0094] Embodiment 5

[0095] Fig. 9 1 is a structural block diagram of a battery connector fuse design device provided in Embodiment 5 of the present invention. Embodiment 5 of the present invention provides a battery connector fuse design device, and the battery connector fuse design device 100 includes:

[0096] A model building module 10 is used to build an over-current thermal simulation model;

[0097] The temperature field calculation module 20 is used to apply a preset current to the overcurrent thermal simulation model and calculate the temperature field of the overcurrent thermal simulation model;

[0098] A local overheating position and heat transfer direction determination module 30, used to determine the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field;

[0099] The fusing position determining module 40 is used to determine the fusing position of the battery connecting piece according to the local overheating position and the heat transfer direction of the connecting piece.

[0100] The technical solution of this embodiment provides a fuse design device for a battery connecting piece, and the fuse design device for the battery connecting piece includes: a model construction module for constructing an overcurrent thermal simulation model; a temperature field calculation module for applying a preset current to the overcurrent thermal simulation model and calculating the temperature field of the overcurrent thermal simulation model; a local overheating position and heat transfer direction determination module for determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field; and a fuse position determination module for determining the fuse position of the connecting piece according to the local overheating position and heat transfer direction of the battery connecting piece. This method can achieve: by constructing an overcurrent simulation model of the connecting piece and calculating the temperature field, determining the local overheating position and heat transfer direction of the battery connecting piece through the temperature field, and then determining its fuse position according to the local overheating position and heat transfer direction of the battery connecting piece, the fuse time of the connecting piece can be shortened while ensuring the effectiveness and accuracy of the fuse, the fuse process of the connecting piece can be accelerated, and the fuse efficiency can be improved. Moreover, due to the shortened fuse time, the battery can be prevented from being in an overheated state for a long time to cause safety problems, thereby improving the safety of the battery.

[0101] Optionally, the fuse position determination module 40 is further configured to:

[0102] Determining a first fusing position and a second fusing position of the connecting piece according to a local overheating position and a heat transfer direction of the battery connecting piece;

[0103] Performing an opening or a hole-forming process on the first fuse position;

[0104] The second fuse position is subjected to fuse processing.

[0105] The device for designing the fuse of a battery connecting piece provided in the embodiment of the present invention can execute the method for designing the fuse of a battery connecting piece provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0106] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for designing a fuse for a battery connector, characterized in that: include: Construct over-current thermal simulation model; Applying a preset current to the overcurrent thermal simulation model, and calculating the temperature field of the overcurrent thermal simulation model; Determining a local overheating position and a heat transfer direction of the battery connecting piece according to the temperature field; Determining the fuse position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece; the determining the fuse position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece comprises: determining a first fuse position and a second fuse position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece; wherein the temperature of the first fuse position of the connecting piece is lower than the temperature of the second fuse position, and the time required for the first fuse position to reach the melting point is longer than the time required for the second fuse position; Performing an opening or a hole-forming process on the first fuse position; The second fuse position is subjected to a fuse processing.

2. The method for designing the fuse of a battery connector according to claim 1, characterized in that: The temperature field of the calculated over-current thermal simulation model includes: The temperature field of the over-current thermal simulation model is calculated using a numerical heat transfer method.

3. The method for designing the fuse of a battery connector according to claim 1, characterized in that: The determining the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field includes: The local overheating position of the battery connecting piece is determined according to the temperature mark of the temperature field; and the heat transfer direction is determined according to the temperature mark of the temperature field and the local overheating position.

4. The method for designing a fuse for a battery connector according to claim 1, characterized in that: The method of determining the first fusing position and the second fusing position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece comprises: When the local overheating position is located at the edge of the connecting piece and the heat transfer direction is from the edge to the middle position, the middle position of the connecting piece is used as the first fuse position and the edge of the connecting piece is used as the second fuse position.

5. The method for designing the fuse of a battery connecting piece according to claim 4, characterized in that: The method of determining the first fusing position and the second fusing position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece comprises: When the local overheating position is located in the middle position of the connecting piece and the heat transfer direction is from the middle position to the edge position, the edge position of the connecting piece is used as the first fuse position and the middle position is used as the second fuse position.

6. The method for designing the fuse of a battery connector according to claim 1, characterized in that: Before building the over-current thermal simulation model, it also includes: Constructing a geometric model of the battery connecting piece; The physical parameters of the battery connecting piece are configured in the geometric model in combination with finite element software.

7. The method for designing a fuse for a battery connector according to claim 6, characterized in that: The physical parameters of the battery connecting sheet at least include: density, specific heat capacity, thermal conductivity and electrical conductivity of the connecting sheet material.

8. A fuse design device for a battery connector, characterized in that: include: Model building module, used to build over-current thermal simulation model; A temperature field calculation module, used for applying a preset current to the overcurrent thermal simulation model and calculating the temperature field of the overcurrent thermal simulation model; A local overheating position and heat transfer direction determination module, used to determine the local overheating position and heat transfer direction of the battery connecting piece according to the temperature field; a fuse position determination module, used to determine the fuse position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece; the fuse position determination module is also used to: determine the first fuse position and the second fuse position of the connecting piece according to the local overheating position and the heat transfer direction of the battery connecting piece; The temperature of the first fusing position of the connecting piece is lower than that of the second fusing position, and the time required for the first fusing position to reach the melting point is longer than that required for the second fusing position; Performing an opening or a hole-forming process on the first fuse position; The second fuse position is subjected to a fuse processing.

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