A jig for BMS board and battery cell fixed welding

Abstract

A fixture for fixing and welding a BMS board to a battery cell includes a base with a cavity for holding the BMS board and the battery cell. The cavity has a through hole at its bottom for the battery cell leads to extend out. Two or more first magnets are symmetrically arranged in two rows on the base, located on either side of the cavity. A cover plate is placed on the base to fix the BMS board and battery cell within the cavity; the cover plate has at least one welding hole on its upper part. Two second magnets, the same number as the first magnets but with opposite magnetic properties, are symmetrically arranged in two rows on the lower part of the cover plate, corresponding to the positions of the first magnets, so that when the cover plate is placed on the base, the first and second magnets attract each other. This invention, through the positioning of the cavity, ensures the accuracy of the relative position between the battery cell assembly and the BMS board, and precisely positions the B+, B-, B1, and B2 welding points, greatly improving the welding yield.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology for electronic product manufacturing, specifically to a fixture suitable for fixing and welding BMS boards and battery cells. Background Technology

[0002] During the assembly and processing of the BMS board and battery cells, it is crucial to precisely weld the B+, B1, B2, and B- terminals of the BMS board onto the battery cells. This is a critical and important step in assembling a safe and reliable lithium battery pack. In existing technologies, for certain battery packs, the BMS board must be manually placed on the cell assembly and fixed to it using adhesive tape or similar methods for welding. After welding is completed, the adhesive tape is removed.

[0003] This approach has many pain points and drawbacks:

[0004] 1. Poor positioning accuracy: It relies entirely on manual placement by operators. First, it is difficult to ensure that the BMS board is placed parallel to the battery cell assembly, which may cause interference between the BMS board and the casing. Second, without precise positioning, the nickel strips of the battery cell assembly may collide with the electronic components of the BMS board, causing a short circuit.

[0005] 2. Low production efficiency: Manual operation is time-consuming and labor-intensive, making it impossible to achieve fast and continuous operation, which seriously affects the production cycle and efficiency.

[0006] 3. Consistency is difficult to guarantee: Using adhesive tape to fix the BMS board and the cell assembly results in uneven pressure, making it impossible to ensure that the BMS board is placed parallel to the cell assembly, leading to large fluctuations in product quality.

[0007] 4. High safety risks: When the BMS board is welded to the battery cell assembly, the battery cell assembly is completely exposed, and the welding tip can easily burn the battery casing, causing risks such as short circuits.

[0008] Therefore, there is an urgent need for a specialized welding fixture that can accurately, efficiently, and safely fix the BMS board to the battery cell and wrap the cell assembly, exposing only the welding holes. Utility Model Content

[0009] Based on this, the present invention provides a fixture for fixing and welding BMS boards and battery cells, in order to solve the technical problem that the existing technology of manually placing BMS boards on the battery cell assembly for welding is not only inaccurate and inefficient, but also poses a great safety risk.

[0010] To achieve the above objectives, this utility model provides a fixture for fixing and welding a BMS board to a battery cell, comprising:

[0011] The base has a cavity for placing the BMS board and the battery cell, and the bottom of the cavity has a through hole for the lead wire of the battery cell to extend out.

[0012] The first magnet, which consists of two or more magnets, is arranged symmetrically in two rows on the base and located on both sides of the receiving cavity;

[0013] A cover plate, which is used to cover the base to fix the BMS board and battery cell placed in the receiving cavity, and the upper part of the cover plate is provided with at least one welding hole.

[0014] The second magnet, which has the same number as the first magnet but opposite magnetic properties, is arranged in two symmetrical rows on the lower part of the cover plate and in positions corresponding to the first magnet, so that when the cover plate is placed on the base, the first magnet and the second magnet attract each other.

[0015] As a further preferred embodiment of this utility model, the two sides of the receiving cavity extend into the inner wall of the base to form multiple notches, so as to facilitate the user to take out the BM plate and battery cell inside the receiving cavity.

[0016] As a further preferred embodiment of this utility model, the notches are six in number and are evenly spaced on both sides of the receiving cavity.

[0017] As a further preferred embodiment of this utility model, there are four welding holes, namely a first welding hole, a second welding hole, a third welding hole, and a fourth welding hole.

[0018] As a further preferred embodiment of this utility model, the first welding hole is used for welding to the B+ terminal of the battery cell, the second welding hole is used for welding to the B- terminal of the battery cell, the third welding hole is used for welding to the B1 terminal of the battery cell, and the fourth welding hole is used for welding to the B2 terminal of the battery cell.

[0019] As a further preferred embodiment of this utility model, the base is provided with at least one positioning post, which is disposed on the base and located at both ends of the receiving cavity; the lower part of the cover plate is provided with positioning holes of the same number as the positioning posts, and when the cover plate is placed on the base, the positioning posts and positioning holes abut against each other.

[0020] As a further preferred embodiment of this utility model, one end of the base is provided with two positioning posts, and the other end is provided with one positioning post.

[0021] As a further preferred embodiment of this utility model, the number of the first magnet and the second magnet are both eight, and they are arranged in two rows at even intervals.

[0022] As a further preferred embodiment of this utility model, the base is a cuboid structure.

[0023] As a further preferred embodiment of this utility model, the shape of the receiving cavity matches the shape of the battery cell.

[0024] The fixture for fixing and welding BMS boards and battery cells according to this utility model can achieve the following beneficial effects by adopting the above technical solution:

[0025] 1. High-precision positioning: The positioning of the cavity ensures the accuracy of the relative position between the battery cell assembly and the BMS board. The welding positions of B+, B-, B1, and B2 are accurately positioned, which greatly improves the welding yield. B+ and B- are the positive and negative terminals of the battery cell assembly, and B1 and B2 are the terminals of voltage sampling points or other types of test points located between the positive and negative terminals B+ and B-.

[0026] 2. Uniform and reliable clamping: The multi-point magnetic attraction design can apply uniform vertical pressure to the BMS board, ensuring that the BMS board is placed parallel to the surface of the battery cell assembly, so that the BMS board and the battery cell assembly are in a consistent and stable position.

[0027] 3. High efficiency and automation: This fixture is easy to integrate into automated production lines and can work in conjunction with loading and unloading robots and welding robots to achieve one-button operation, thereby greatly improving production efficiency.

[0028] 4. High safety: This fixture provides multi-faceted protection for the manufactured products, effectively avoiding risks such as short circuits and crushing injuries caused by misoperation, thus protecting the safety of the products and operators.

[0029] 5. Reduced costs: It reduces rework and scrap caused by poor welding, greatly reduces reliance on skilled operators, and thus reduces overall production costs.

[0030] 6. The fixture of this utility model has a simple structure and occupies little space. Attached Figure Description

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] Figure 1 This is a schematic diagram of one embodiment of the fixture provided by this utility model for fixing and welding BMS board and battery cell.

[0033] Figure 2 for Figure 1 A structural decomposition diagram;

[0034] Figure 3 This is a working process diagram of an embodiment of the fixture provided by this utility model for fixing and welding BMS board and battery cell.

[0035] The markings in the image are as follows:

[0036] 1. Base, 11. Notch, 12. Receiving cavity, 13. Through hole, 14. Welding hole, 2. Cover plate, 21. Positioning hole, 3. Positioning post, 4. First magnet, 5. Second magnet, 6. Battery cell.

[0037] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Terms such as "upper," "lower," "left," "right," "middle," and "one" used in the preferred embodiments are merely for clarity of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of the present invention.

[0039] like Figure 1 , Figure 2 As shown, this utility model provides a fixture for fixing and welding a BMS board to a battery cell, comprising:

[0040] The base 1 has a cavity 12 for placing the BMS board and the battery cell 6. The bottom of the cavity 12 has a through hole 13 for the lead wire of the battery cell 6 to extend out. The shape of the cavity 12 matches the shape of the battery cell 6, for example, the same shape, so that the BMS board and the battery cell 6 can be placed just right, thereby playing a certain role in fixing them.

[0041] The first magnet 4, which consists of two or more magnets, is symmetrically arranged in two rows on the base 1 and is located on both sides of the receiving cavity 12;

[0042] A cover plate 2 is used to cover the base 1 to fix the BMS board placed in the receiving cavity 12 to the battery cell 6. The upper part of the cover plate 2 is provided with at least one welding hole 14.

[0043] The second magnet 5, which has the same number as the first magnet 4 but opposite magnetic properties, is arranged in two rows symmetrically on the lower part of the cover plate 2 and in a position corresponding to the first magnet 4, so that when the cover plate 2 is placed on the base 1, the first magnet 4 and the second magnet 5 attract each other.

[0044] In a specific implementation, such as Figure 1As shown, there are four welding holes 14, namely a first welding hole, a second welding hole, a third welding hole, and a fourth welding hole. The first welding hole is used for welding to the B+ terminal of the battery cell 6, the second welding hole is used for welding to the B- terminal of the battery cell 6, the third welding hole is used for welding to the B1 terminal of the battery cell 6, and the fourth welding hole is used for welding to the B2 terminal of the battery cell 6. For example, B- can be welded first, followed by welding B1, B2, and B+ in sequence, and then heat shrink tubing can be applied. Specifically, there are eight first magnets 4 and eight second magnets 5, arranged in two rows at even intervals. Of course, in specific implementations, the specific number of first magnets 4 and second magnets 5 can be set according to specific needs, and there is no limitation here.

[0045] Preferably, the two sides of the receiving cavity 12 extend toward the inner wall of the base 1 to form a plurality of notches 11, so as to facilitate the user to take out the BM board and battery cell 6 inside the receiving cavity 12, thereby improving the working efficiency of the fixture. Specifically, there may be six notches 11, which are evenly spaced on both sides of the receiving cavity 12.

[0046] To better ensure precise fixing and welding of the BMS board and the battery cell 6, at least one positioning post 3 is provided on the base 1, located at both ends of the receiving cavity 12; the lower part of the cover plate 2 is provided with positioning holes 21, the same number as the positioning posts 3, and when the cover plate 2 is placed on the base 1, the positioning posts and positioning holes 21 abut against each other. Specifically, as shown... Figure 2 As shown, one end of the base 1 is provided with two positioning posts 3, and the other end is provided with one positioning post 3. Of course, the number of positioning posts 3 and positioning holes 21 can also be 4 or 5, etc.

[0047] This application uses a first magnet 4 and a second magnet 5, and two positioning posts 3 are set at one end and one positioning post 3 is set at the other end. This can play a foolproof role. That is, when the front and back of the cover plate 2 are reversed, the magnets that are originally attracted by opposite poles become like poles. The like poles repel each other, so the cover plate 2 cannot be closed. Or when the left and right positions of the cover plate 2 are reversed, the number of positioning holes 21 and positioning posts 3 at both ends do not correspond, so it cannot be closed.

[0048] In another specific implementation, such as Figure 1 As shown, the base 1 is a cuboid structure, but it can also be other shapes, which are not limited in this application.

[0049] like Figure 3As shown, the BMS board and battery cell 6 are placed in the base 1. The cover plate 2 is assembled with the base 1 according to the positioning holes 21. The BMS board and the battery cell assembly are soldered together using a soldering iron tip. After soldering, the whole assembly is turned over. The lead wire of the battery cell 6 is extended through the through hole 13 at the bottom of the base 1 and soldered to the main board on the other side.

[0050] The fixture of this invention can be applied to the important process of welding lithium battery packs, BMS boards and battery cells 6. It has a very efficient operation for the production of cell assemblies (which refers to a combination of multiple battery cells 6) and can improve product consistency. Moreover, this invention has a simple structure and is easy to use.

[0051] Although specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.

Claims

1. A fixture for fixing and welding a BMS board to a battery cell, characterized in that, include: The base has a cavity for placing the BMS board and the battery cell, and the bottom of the cavity has a through hole for the lead wire of the battery cell to extend out. The first magnet, which consists of two or more magnets, is arranged symmetrically in two rows on the base and located on both sides of the receiving cavity; A cover plate, which is used to cover the base to fix the BMS board and battery cell placed in the receiving cavity, and the upper part of the cover plate is provided with at least one welding hole. The second magnet, which has the same number as the first magnet but opposite magnetic properties, is arranged in two symmetrical rows on the lower part of the cover plate and in positions corresponding to the first magnet, so that when the cover plate is placed on the base, the first magnet and the second magnet attract each other.

2. The fixture for fixing and welding BMS board and battery cell according to claim 1, characterized in that: The two sides of the receiving cavity extend into the inner wall of the base to form multiple notches, so as to facilitate the user to take out the BM plate and battery cells inside the receiving cavity.

3. The fixture for fixing and welding BMS board and battery cell according to claim 2, characterized in that: There are six notches, which are evenly spaced on both sides of the receiving cavity.

4. The fixture for fixing and welding BMS board and battery cell according to claim 1, characterized in that: There are four welding holes, namely the first welding hole, the second welding hole, the third welding hole, and the fourth welding hole.

5. The fixture for fixing and welding BMS board and battery cell according to claim 4, characterized in that: The first welding hole is used for welding to the B+ terminal of the battery cell, the second welding hole is used for welding to the B2 terminal of the battery cell, the third welding hole is used for welding to the B1 terminal of the battery cell, and the fourth welding hole is used for welding to the B- terminal of the battery cell.

6. The fixture for fixing and welding BMS board and battery cell according to claim 1, characterized in that: The base is provided with at least one positioning post, which is disposed on the base and located at both ends of the receiving cavity; the lower part of the cover plate is provided with positioning holes of the same number as the positioning posts, and when the cover plate is placed on the base, the positioning posts and positioning holes abut against each other.

7. The fixture for fixing and welding BMS board and battery cell according to claim 6, characterized in that: The base has two positioning posts at one end and one positioning post at the other end.

8. The fixture for fixing and welding BMS board and battery cell according to claim 1, characterized in that: The number of the first magnet and the second magnet are both eight, and they are arranged in two rows at even intervals.

9. The fixture for fixing and welding BMS board and battery cell according to claim 1, characterized in that: The base has a cuboid structure.

10. The fixture for fixing and welding a BMS board to a battery cell according to any one of claims 1 to 9, characterized in that: The shape of the receiving cavity matches the shape of the battery cell.

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