Rechargeable lithium battery with built-in soft package battery core

Abstract

The rechargeable lithium battery comprises a conductive shell, a charging and discharging protection mainboard, the soft package battery cell and a conductive piece, the soft package battery cell comprises a battery cell main body, a positive pole lug and a negative pole lug are arranged on the battery cell main body, the positive pole lug is electrically connected with the charging and discharging protection mainboard in a contact mode through the conductive piece, and the negative pole lug is electrically connected with the charging and discharging protection mainboard through the conductive piece. And the negative tab is electrically connected with the charging and discharging protection mainboard through the conductive shell. Compared with the prior art, contact type electric connection between the battery cell and the charging and discharging protection mainboard is achieved through the conductive piece and the conductive shell, welding fixation is not needed, the structure is simple, production is convenient, and automatic production of products is convenient to achieve.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, and specifically relates to a rechargeable lithium battery with built-in soft-pack cells. Background Technology

[0002] Currently, rechargeable lithium batteries are typically assembled from steel-cased or pouch cells, along with other components such as a casing and a charge / discharge protection board. In pouch cells, the positive and negative electrodes are usually welded to the charge / discharge protection board to ensure conductivity. This makes the cell manufacturing and assembly process complex, resulting in low production efficiency and difficulty in achieving automated production. Utility Model Content

[0003] To address the aforementioned issues, the primary objective of this invention is to provide a rechargeable lithium battery with a built-in soft-pack battery cell. This battery achieves contact-type electrical connection between the battery cell and the charge / discharge protection mainboard through conductive components and a conductive shell, eliminating the need for welding and fixing. This design is simple, convenient for production, and facilitates automated production.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] This utility model provides a rechargeable lithium battery with a built-in soft-pack cell, including: a conductive shell, a charge / discharge protection main board, a soft-pack cell, and conductive components. The soft-pack cell includes a cell body, on which a positive electrode tab and a negative electrode tab are disposed. The positive electrode tab is electrically connected to the charge / discharge protection main board through the conductive components, and the negative electrode tab is electrically connected to the charge / discharge protection main board through the conductive shell.

[0006] Furthermore, the conductive component includes one of a conductive spring, a conductive sheet, and conductive adhesive.

[0007] Furthermore, the negative electrode tab is an L-shaped spring piece, with one side of the spring piece attached to the inner wall of the conductive shell and the other side attached to the bottom of the battery cell body.

[0008] Furthermore, a conductive negative electrode spring is provided between the charge / discharge protection main board and the conductive shell. The negative electrode spring has an "L" shaped structure, with one side of the negative electrode spring fitting against the inner wall of the conductive shell and the other side fitting against the bottom of the charge / discharge protection main board.

[0009] Furthermore, a charging interface is also installed on the charging and discharging protection motherboard.

[0010] Furthermore, the rechargeable lithium battery also includes a plastic body, which is fixed to a conductive shell. The charge / discharge protection main board is fixed to the plastic body, and a positive electrode post is also installed on the plastic body. The positive electrode post is electrically connected to the charge / discharge protection main board. A negative electrode portion is also provided at the bottom of the conductive shell.

[0011] The advantage of this invention is that, compared with the prior art, it achieves contact-type electrical connection between the battery cell and the charge / discharge protection mainboard through conductive components and a conductive shell, eliminating the need for welding and fixing, resulting in a simple structure, convenient production, and easy automation of product manufacturing. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a rechargeable lithium battery.

[0013] Figure 2 This is an exploded view of a rechargeable lithium battery.

[0014] Figure 3 This is a cross-sectional view of a rechargeable lithium battery.

[0015] In the diagram: 1. Conductive shell; 2. Charge / discharge protection main board; 3. Soft-pack battery cell; 31. Battery cell body; 32. Positive electrode tab; 33. Negative electrode tab; 4. Conductive component; 5. Main board negative electrode spring; 6. Charging interface; 7. Plastic body; 8. Positive electrode post; 9. Negative electrode section. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] To achieve the above objectives, the technical solution of this utility model is as follows:

[0018] See Figure 1-3 As shown, this embodiment provides a rechargeable lithium battery with a built-in soft-pack cell, including: a conductive casing 1, a charge / discharge protection main board 2, a soft-pack cell 3, and a conductive component 4. The soft-pack cell 3 includes a cell body 31, on which a positive electrode tab 32 and a negative electrode tab 33 are disposed. The positive electrode tab 32 is electrically connected to the charge / discharge protection main board 2 through the conductive component 4, and the negative electrode tab 33 is electrically connected to the charge / discharge protection main board 2 through the conductive casing 1.

[0019] In this embodiment, the conductive housing 1 is a metal housing with conductive function. The positive electrode tab of the soft-pack battery cell 3 conducts electricity through the contact between the conductive component 4 and the charge-discharge protection main board 2, and the negative electrode tab 33 conducts electricity through the contact between the conductive housing 1 and the charge-discharge protection main board 2. This eliminates the need for welding to fix the soft-pack battery cell 3 and the charge-discharge protection main board 2. The structure is simple, and production and assembly are relatively convenient, which facilitates the automated production of the product.

[0020] Furthermore, the conductive component 4 includes, but is not limited to, a conductive spring, a conductive spring sheet, and conductive adhesive. In this embodiment, the conductive component is preferably a conductive spring, with both ends of the conductive spring abutting against the soft-pack battery cell 3 and the charge / discharge protection mainboard 2, respectively. This enables a soft connection between the soft-pack battery cell and the charge / discharge protection mainboard 2, providing a buffer space to prevent the connection from breaking when the battery is impacted, thereby ensuring the stability of the battery cell structure. When there are errors in the assembly dimensions of the soft-pack battery cell 3 and the charge / discharge protection mainboard 2, the conductive spring can also use elastic deformation to offset the dimensional errors, thereby ensuring the stability of the conductive structure.

[0021] Furthermore, the pouch cell 3 adopts a polymer pouch cell 3.

[0022] Furthermore, the negative electrode tab 33 is an L-shaped spring piece, one side of which is attached to the inner wall of the conductive housing 1, and the other side is attached to the bottom of the battery cell body 31.

[0023] Furthermore, a conductive negative electrode spring 5 is provided between the charge / discharge protection main board 2 and the conductive shell 1. The negative electrode spring 5 has an "L" shaped structure, with one side of the negative electrode spring 5 attached to the inner wall of the conductive shell 1 and the other side attached to the bottom of the charge / discharge protection main board 2.

[0024] Furthermore, a charging interface 6 is also installed on the charging and discharging protection motherboard 2.

[0025] Furthermore, the rechargeable lithium battery also includes a plastic body 7, which is fixed to the conductive housing 1. The charge / discharge protection main board 2 is fixed to the plastic body 7. A positive electrode post 8 is also installed on the plastic body 7. The positive electrode post 8 is electrically connected to the charge / discharge protection main board 2. A negative electrode part 9 is also provided at the bottom of the conductive housing 1.

[0026] The working principle of the rechargeable lithium battery in this embodiment is as follows: the positive terminal 8 serves as the positive terminal of the battery, the negative terminal 9 serves as the negative terminal of the battery, and the external load is powered. The charging interface 6 can be a TYPE-C interface or a USB interface to charge the battery.

[0027] In this embodiment, during the assembly of the rechargeable lithium battery, the positive electrode tab 32 and the negative electrode tab 33 are first installed onto the soft-pack cell 3, and then the soft-pack cell 3 is installed into the conductive housing 1. Then, the conductive component 4, the injection-molded plastic body 7, and the charge / discharge protection main board 2 are installed into the conductive housing 1, so that the conductive component 4 is connected to the charge / discharge protection main board 2 and the positive electrode tab 32.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements 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 rechargeable lithium battery with an embedded jelly-roll cell, characterized in that, include: The battery includes a conductive shell, a charge / discharge protection main board, a soft-pack battery cell, and conductive components. The soft-pack battery cell includes a cell body with a positive electrode tab and a negative electrode tab. The positive electrode tab is electrically connected to the charge / discharge protection main board via a conductive component, and the negative electrode tab is electrically connected to the charge / discharge protection main board via a conductive shell.

2. The rechargeable lithium battery with built-in soft-pack battery cell of claim 1, wherein, The conductive component includes one of a conductive spring, a conductive sheet, and conductive adhesive.

3. The rechargeable lithium battery with an embedded jelly-roll cell of claim 1, wherein, The negative electrode tab is an "L"-shaped spring piece, with one side of the spring piece attached to the inner wall of the conductive shell and the other side attached to the bottom of the battery cell body.

4. The rechargeable lithium battery with an embedded jelly-roll cell of claim 1, wherein, A conductive negative electrode spring is also provided between the charge / discharge protection main board and the conductive shell. The negative electrode spring has an "L" shaped structure, with one side of the negative electrode spring fitting against the inner wall of the conductive shell and the other side fitting against the bottom of the charge / discharge protection main board.

5. The rechargeable lithium battery with an embedded jelly-roll cell of claim 1, wherein, The charging and discharging protection motherboard is also equipped with a charging interface.

6. The rechargeable lithium battery with an embedded jelly-roll cell of claim 1, wherein, The rechargeable lithium battery also includes a plastic body, which is fixed to a conductive shell. The charge / discharge protection main board is fixed to the plastic body. A positive electrode post is also installed on the plastic body and is electrically connected to the charge / discharge protection main board. A negative electrode portion is also provided at the bottom of the conductive shell.

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