Square-shell battery cell structure

Abstract

The utility model discloses a square shell battery cell structure which comprises a steel shell, a roll core is arranged in the steel shell, a top cover is fixedly connected to the top end of the steel shell, and the square shell battery cell structure is characterized in that a connecting piece is arranged at the top end of the roll core, bending positions are arranged at the two ends of the connecting piece, cushion blocks are arranged on the inner sides of the bending positions, and the cushion blocks are located at the bottom end of the connecting piece; the gaskets are arranged between the connecting pieces in the single cells and the roll cores, the connecting pieces and the roll cores are clamped by the cushion blocks, the connecting pieces are not prone to falling off due to heat and gas production in the cells after long-time use, the single cells are not prone to being scrapped, potential safety hazards are not prone to being caused, and practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion batteries, and in particular to a square-shell cell structure. Background Technology

[0002] A battery module is a group of batteries composed of several individual cells and related mounting components. A standard battery module structure has multiple individual cells, and different battery modules use different numbers and sizes of individual cells. The individual cell is a crucial component of the battery module. In existing technologies, the connecting tabs within the individual cell are usually directly connected to the core. After prolonged use, these connecting tabs are prone to detachment due to heat and gas generation inside the cell, rendering the individual cell unusable, posing a safety hazard, and resulting in poor practicality. To address these issues, we propose a prismatic cell structure. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a square-shell battery cell structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A square-shell battery cell structure includes a steel shell, a core inside the steel shell, a top cover fixedly connected to the top of the steel shell, a connecting piece at the top of the core, bends at both ends of the connecting piece, pads inside the bends, and the pads located at the bottom of the connecting piece.

[0006] Preferably, a pole is provided in the middle of the top cover, the pole extends out of the top cover through the pole hole, and the pole and the connecting piece are welded and fixed.

[0007] Preferably, a sealing ring is provided at the bottom end of the pole post, and the sealing ring is arranged around the outside of the pole post.

[0008] Preferably, the top end of the pad is connected to the connecting piece, and the bottom end of the pad is connected to the winding core. Preferably, both ends of the connecting piece are connected to the steel shell, and the top end of the connecting piece contacts the pole post and the top cover.

[0009] Preferably, the bends are arranged symmetrically with respect to the pad block.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] By placing a gasket between the connecting piece and the core inside the individual battery cell, and using the gasket to hold the connecting piece and the core in place, the connecting piece is less likely to fall off due to heat and gas generated inside the battery cell after long-term use, thus preventing the individual battery cell from being scrapped. This reduces the risk of safety hazards and is highly practical. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of a square-shell battery cell structure proposed in this utility model.

[0013] In the diagram: 1. Steel shell; 2. Core; 3. Pole post; 4. Connecting piece; 5. Bending point; 6. Pad; 7. Top cover; 8. Sealing ring. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Reference Figure 1 A square-shell battery cell structure includes a steel shell 1, with a core 2 inside the steel shell 1. The core 2 is placed into the steel shell 1 after being wound externally. A top cover 7 is fixedly connected to the top of the steel shell 1. After the core 2 is placed into the steel shell 1, and other components are installed, the top cover 7 and the steel shell 1 are fixed by welding to complete the assembly of a single battery cell.

[0016] The top cover 7 has a pole post 3 in the middle, and a connecting piece 4 at the bottom of the pole post 3. The pole post 3 and the connecting piece 4 are welded and fixed. The bottom of the pole post 3 contacts the connecting piece 4. The connecting piece 4 and the core 2 are electrically connected. The connecting piece 4 has bends at both ends. The bends are machined. The connecting piece 4 connects the pole post 3 and the core 2, and has current input and output functions.

[0017] A pad 6 is provided on the inner side of the bend. The pad 6 is located at the bottom of the connecting piece 4. By placing the pad between the connecting piece 4 and the core 2 inside the individual battery cell, the pad 6 is used to hold the connecting piece 4 and the core 2 in place. After long-term use, the connecting piece 4 is not easy to fall off due to heat and gas generated inside the battery cell, thus preventing the individual battery cell from being scrapped. It is not easy to cause safety hazards and is highly practical.

[0018] A sealing ring 8 is provided at the bottom of the electrode post 3. The sealing ring 8 is arranged around the outside of the electrode post 3. The sealing ring 8 can seal the electrode post 3, effectively preventing electrolyte leakage and short circuit of individual cells, thus improving safety.

[0019] The top of the pad 6 connects to the connecting piece 4, and the bottom of the pad 6 connects to the core 2. The pad 6 secures the connecting piece 4 and the core 2, preventing the connecting piece 4 from easily detaching due to heat or gas generation inside the battery cell even after prolonged use. Both ends of the connecting piece 4 connect to the steel shell 1, and the top of the connecting piece 4 contacts the terminal post 3 and the top cover 7. The steel shell 1 and the top cover 7 limit the connection piece 4, preventing it from easily detaching due to heat or gas generation inside the battery cell even after prolonged use, thus avoiding the scrapping of a single battery cell and minimizing safety hazards. This design is highly practical.

Claims

1. A square-shell battery cell structure, comprising a steel shell, a wound core disposed inside the steel shell, and a top cover fixedly connected to the top of the steel shell, characterized in that, The core is provided with a connecting piece at the top, and the connecting piece has bends at both ends. A pad is provided on the inner side of the bend, and the pad is located at the bottom end of the connecting piece.

2. The prismatic battery cell structure according to claim 1, characterized in that, The top cover has a pole at the middle position, the pole extends out of the top cover through the pole hole, and the pole and the connecting piece are welded and fixed.

3. The prismatic battery cell structure according to claim 2, characterized in that, The bottom end of the pole post is provided with a sealing ring, which is arranged around the outside of the pole post.

4. The prismatic battery cell structure according to claim 1, characterized in that, The top of the pad is connected to the connecting piece, and the bottom of the pad is connected to the core.

5. The prismatic battery cell structure according to claim 1, characterized in that, The two ends of the connecting piece are connected to the steel shell, and the top of the connecting piece is in contact with the pole and the top cover.

6. The prismatic cell structure according to claim 1, characterized in that, The bends are arranged symmetrically with the pad as the center.

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