Cell protection device applied to soft package lithium battery

Abstract

The utility model relates to a battery cell protection device applied to a soft package lithium battery, which is simple in structure and capable of filling hollow parts on two sides of an extension part of a shell and effectively eliminating potential safety hazards of the battery. Comprising a protection box body arranged in a packaging area at the top of a battery cell, the bottom of the protection box body is designed to be open, an inner cavity for placing a circuit board is integrally formed in the protection box body, a positive tab and a negative tab of the battery cell extend into the inner cavity to be connected with the circuit board and then are bent downwards, and the outer surface of the top of the protection box body abuts against the top of the battery cell. An opening structure matched with the circuit board is further arranged at any position of the peripheral wall of the protection box body. The utility model is applicable to the technical field of batteries.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell protection device for soft-pack lithium batteries. Background Technology

[0002] Soft-pack lithium batteries typically refer to lithium batteries with an aluminum-plastic composite film encapsulation. They offer advantages such as high energy density, portability, long cycle life, and no environmental pollution, and are widely used in mobile communication devices and portable electronic devices. Existing soft-pack lithium batteries generally consist of three parts: the cell, the casing, and the tabs. The casing protects the cell, while the tabs are electrically connected to the cell and extend partially out of the casing for easy connection to other electronic components. To improve battery versatility, the tabs are usually connected to a circuit board for an external power connector during manufacturing. To maintain the battery's small size and portability, the tabs are often bent 180°, folding the circuit board towards the cell before being covered and protected by the extended casing. This structure, with open sides on the extended casing, poses a safety hazard. The circuit board, folded towards the cell, can easily compress the cell during use, causing damage, and in extreme cases, potentially puncturing it. The battery is not adequately protected, posing a safety risk. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a cell protection device for soft-pack lithium batteries that has a simple structure, can fill the hollows on both sides of the extended shell, and effectively eliminates battery safety hazards.

[0004] The technical solution adopted by this utility model is as follows: This utility model includes a protective box body disposed in the top packaging area of ​​the battery cell. The bottom of the protective box body is an open design, and an inner cavity for placing a circuit board is integrally formed inside. The positive and negative tabs of the battery cell extend into the inner cavity and are connected to the circuit board before being bent downward. The outer surface of the top of the protective box body abuts against the top of the battery cell. An opening structure adapted to the circuit board is also provided at any position on the peripheral wall of the protective box body.

[0005] Furthermore, at least one set of connection windows is integrally formed on the side wall of the protective box, and the positive electrode and the negative electrode extend from the connection window into the inner cavity to connect with the circuit board.

[0006] Furthermore, at least two sets of positioning clips are integrally formed on the other side wall of the protective box corresponding to the connecting window, and the positioning clips extend into the inner cavity.

[0007] Furthermore, the top panel of the protective box is provided with demolding openings, the number and position of which correspond to the positioning clips.

[0008] Furthermore, a soft pad is provided on the top outer surface of the protective box, and after being flipped over, the soft pad is placed between the battery cell and the protective box.

[0009] Finally, protective tape for the tabs is also provided on one side of the protective box corresponding to the positive tab and the negative tab.

[0010] Compared with existing technologies, the advantages of this utility model are as follows: This utility model adopts a box-type structure with an open bottom design. The surrounding walls form a ring-shaped protective structure around the top encapsulation area of ​​the battery cell. This effectively compensates for the shortcomings of open sides when the extended portion of the outer shell covers the tabs, avoiding the risk of objects penetrating from the sides and damaging the tabs, circuit board, and battery cell during subsequent use. After the protective box is bent along with the tabs, its top panel acts as a protective panel, contacting the top of the battery cell. Since the positive and negative tabs, as well as the circuit board, are all placed within the inner cavity, the top panel prevents puncture of the battery cell, providing comprehensive protection. Therefore, this utility model has a simple structure, fills the open sides of the extended portion of the outer shell, and effectively eliminates potential battery safety hazards. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the battery cell;

[0012] Figure 2 This is a schematic diagram of the bearing structure in the top packaging area of ​​the battery cell;

[0013] Figure 3 This is a schematic diagram of the structure of the protective device of this utility model;

[0014] Figure 4 This is a schematic diagram of the structure of the protective device of this utility model when it is placed upright;

[0015] Figure 5 This is a schematic diagram of the circuit board. Detailed Implementation

[0016] like Figures 1 to 5As shown, this utility model includes a protective box 2 disposed in the top encapsulation area of ​​the battery cell 1. The bottom of the protective box 2 is an open design, and an inner cavity 4 for placing a circuit board 3 is integrally formed inside. The positive electrode 5 and negative electrode 6 of the battery cell 1 extend into the inner cavity 4 and connect with the circuit board 3 before bending downwards. The outer surface of the top of the protective box 2 abuts against the top of the battery cell 1. An opening structure 7 adapted to the circuit board 3 is also provided at any position on the periphery of the protective box 2. This utility model adopts a box structure, and the bottom of the protective box 2 is an open design. The surrounding walls form a surrounding protective structure in the top encapsulation area of ​​the battery cell 1, thus providing... This design effectively compensates for the drawback of open sides when the extended outer shell covers the tabs, avoiding the risk of objects penetrating from the sides and damaging the tabs, circuit board 3, and battery cell 1 during subsequent use. After the protective box 2 is bent along with the tabs, its top panel acts as a protective panel, contacting the top of the battery cell 1. Since the positive tab 5, the negative tab 6, and the circuit board 3 are all placed in the inner cavity 4, the top panel provides all-around protection against puncturing the battery cell 1. The circuit board 3 is a flexible circuit board, with its external connection port extending from the opening structure 7 to the outer shell extension, facilitating connection with other electronic components.

[0017] In this invention, two sets of connection windows 8 are integrally formed on the side wall of the protective box 2. The positions of the two sets of connection windows 8 correspond to the positive electrode tab 5 and the negative electrode tab 6, respectively. The positive electrode tab 5 and the negative electrode tab 6 extend into the inner cavity 4 through the connection windows 8 and are connected to the circuit board 3. The circuit board 3 is a flexible circuit board, and a protective plate 13 is attached to the circuit board 3 for protection. The length of the protective plate 13 is adapted to the inner cavity 4. At least two sets of positioning clips 9 are integrally formed on the other side wall of the protective box 2 corresponding to the connection windows 8. The positioning clips 9 extend into the inner cavity 4 to clamp and position the protective plate 13, preventing the circuit board 3 from shaking or falling off inside the inner cavity 4. The top panel of the protective box 2 is provided with demolding openings 10, the number and position of which correspond to the positioning clips 9.

[0018] A soft pad 11 is provided on the top outer surface of the protective box 2. After flipping, the soft pad 11 is placed between the battery cell 1 and the protective box 2. When installing this utility model, first place the circuit board 3 into the inner cavity 4 from the bottom open end of the protective box 1, and limit it by the positioning clip 9; then extend the positive electrode 5 and the negative electrode 6 from the corresponding connection window 8 and insert them into the circuit board 3; at this time, keep the positive electrode 5 and the negative electrode 6 within the range of the battery cell 1 and bend them downwards by 180°. The protective box 2 is also flipped, and the top panel with the soft pad 11 is rotated to contact the top of the battery cell 1. The soft pad 11 provides buffer protection, while the top panel of the protective box 2 provides rigid protection. A tab protection tape 12 is also provided on one side of the protective box 2 corresponding to the positive tab 5 and the negative tab 6. After the protective box 2 is flipped over, the tab protection tape 12 is tightly attached to the positive tab 5 and the negative tab 6, and provides protection for the latter two.

[0019] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cell protection device for soft-pack lithium batteries, characterized in that: The protective box (2) is located in the top encapsulation area of ​​the battery cell (1). The bottom of the protective box (2) is open, and an inner cavity (4) for placing the circuit board (3) is integrally formed inside. The positive electrode (5) and negative electrode (6) of the battery cell (1) extend into the inner cavity (4) and are connected to the circuit board (3) before bending downward. The outer surface of the top of the protective box (2) abuts against the top of the battery cell (1). An opening structure (7) adapted to the circuit board (3) is also provided at any position on the periphery of the protective box (2).

2. The cell protection device for soft-pack lithium batteries according to claim 1, characterized in that: The protective box (2) also has at least one set of connection windows (8) integrally formed on its side wall. The positive electrode (5) and the negative electrode (6) extend from the connection window (8) into the inner cavity (4) and are connected to the circuit board (3).

3. The cell protection device for soft-pack lithium batteries according to claim 2, characterized in that: At least two sets of positioning clips (9) are integrally formed on the other side wall of the protective box (2) corresponding to the connecting window (8), and the positioning clips (9) extend into the inner cavity (4).

4. A cell protection device for soft-pack lithium batteries according to claim 3, characterized in that: The protective box (2) has demolding openings (10) on its top panel, the number and position of which correspond to the positioning clips (9).

5. A cell protection device for soft-pack lithium batteries according to claim 1, characterized in that: A soft pad (11) is provided on the top outer surface of the protective box (2). After flipping, the soft pad (11) is placed between the battery cell (1) and the protective box (2).

6. A cell protection device for soft-pack lithium batteries according to claim 1, characterized in that: A protective tape (12) for the tabs is also provided on one side of the protective box (2) corresponding to the positive tab (5) and the negative tab (6).

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