Battery shell and battery cell

Abstract

The utility model provides a battery shell and a battery cell, and relates to the technical field of lithium batteries, the battery shell comprises a battery cell body, the battery cell body comprises a plurality of anode plates and cathode plates, and the anode plates and the cathode plates are distributed and overlapped together in a staggered manner; the diaphragm is arranged between the anode plate and the cathode plate, the two ends of the diaphragm extend, the two port parts, extending out of the anode plate and the cathode plate, of the plurality of diaphragms are overlapped with each other, the overlapped parts at the two ends of the diaphragms are provided with lock marks, and the plurality of diaphragms are compounded together by the lock marks. The energy density of the battery cell can be effectively improved by 0.3%-6%, meanwhile, the problem that the diaphragm falls on the sealing edge when the battery cell enters the shell is effectively solved, the problems that the battery cell enters the shell badly due to the fact that the diaphragm falls on the sealing edge and short circuit is caused due to mutual contact of cathode prototypes are almost completely eradicated, the battery cell entering-shell optimal rate of the battery cell body is improved, and the battery cell entering-shell quality is improved. And the practicability of the lithium battery is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a battery casing and a battery cell. Background Technology

[0002] Lithium batteries are widely used in laptops, digital products, and mobile communications due to their advantages such as high operating voltage, high energy density, long cycle life, and no memory effect. At the same time, with the rapid development of electronic devices, people's demand for the energy density of lithium batteries is increasing.

[0003] In pursuit of high energy density in battery cells, existing bare battery cells feature a wrapping design. However, the main purpose of wrapping is to prevent the diaphragm from shrinking during heat generation. Diaphragm shrinkage can lead to short circuits at the cathode and anode, posing a safety hazard. Furthermore, the partial wrapping of the diaphragm with wrapping cannot prevent unwrapped diaphragms from falling onto the sealing edge when the battery cell is installed, affecting the sealing reliability of the battery cell. Utility Model Content

[0004] This utility model addresses the problem that using a bare cell with a rubber-wrapped design to improve the high energy density of the cell can lead to a short circuit between the anode and cathode when the separator shrinks, posing a safety hazard. Furthermore, it cannot prevent the unwrapped separator from falling onto the sealing edge when the cell is inserted into the casing, which affects the sealing reliability of the cell. Therefore, this utility model proposes a battery casing and a cell.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a battery cell, comprising a battery cell body, wherein the battery cell body includes a plurality of anodes and cathodes, wherein the anodes and cathodes are alternately distributed and stacked together;

[0006] It also includes a diaphragm: the diaphragm is disposed between the anode and the cathode and extends to both ends, and multiple diaphragms extending to the two ends of the anode and the cathode overlap each other, and the overlapping portions of the diaphragms are provided with locking marks, wherein the locking marks combine multiple diaphragms together.

[0007] By replacing the traditional rubber-wrapped design with a diaphragm, the energy density of the battery cell can be effectively improved by 0.3%-6%. At the same time, it effectively solves the problem of the diaphragm falling on the sealing edge during the battery cell installation process, and almost eliminates the possibility of the diaphragm falling on the sealing edge and causing poor battery cell installation.

[0008] Preferably, the number of locks located on the same side is at least 1.

[0009] The locking seal mainly serves to replace the wrapping rubber to limit multiple diaphragms, which helps to prevent the diaphragm from shrinking during heat generation in the diaphragm cell, and at the same time can prevent the anode and cathode from coming into contact with each other and causing a short circuit.

[0010] Preferably, the two ends of the stacked anode extend out of the cathode by a distance of 0.1-1 mm, and the two ends of the diaphragm extend beyond the two ends of the anode by 0.3-20 mm.

[0011] Meanwhile, both ends of the diaphragm are longer than the ends of the anode, in order to better cover the anode and cathode within the diaphragm, ensuring that electron ionization occurs entirely within the diaphragm, thereby improving energy conversion efficiency.

[0012] Preferably, the locking mark is formed by thermal melting of the overlapping parts of the diaphragm.

[0013] Preferably, the interval between two adjacent lock marks in the same group is 0.1-10 mm.

[0014] Preferably, the diaphragms are stacked together and the port is cut to form a distance of 0.2-10 mm from the anode port.

[0015] Preferably, the distance between the diaphragm port and the lock is 0.1-5mm.

[0016] Preferably, the diaphragm port is bent upward from the locking position and overlapped on the diaphragm surface to form a locking edge structure, wherein the vertical distance between the uppermost end of the overlapping part of the diaphragm and the uppermost end of the anode is greater than 0.

[0017] A battery casing, wherein the battery cell body is disposed inside the casing body.

[0018] In this invention, by replacing the traditional rubber wrapping design with a separator, the energy density of the battery cell can be effectively improved by 0.3%-6%. At the same time, it effectively solves the problem of the separator falling on the sealing edge during the battery cell insertion process, almost eliminating the problem of poor battery cell insertion caused by the separator falling on the sealing edge, as well as the problem of short circuit caused by the cathode prototypes coming into contact with each other. This improves the battery cell insertion yield and thus effectively enhances the practicality of the lithium battery. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the main body of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the battery cell of this utility model;

[0021] Figure 3 This is a top view of the locking diaphragm structure of this utility model;

[0022] Figure 4 This is a cross-sectional view of the battery cell after it has been cut according to this utility model.

[0023] Figure 5 This is a cross-sectional view of the shaped battery cell of this utility model.

[0024] Legend: 1. Battery cell body; 11. Anode; 12. Cathode; 13. Diaphragm; 14. Locking seal; 2. Housing body. Detailed Implementation

[0025] Example 1, referring to Figures 1-4 As shown, this embodiment discloses a battery cell, including a battery cell body 1. The battery cell body 1 includes multiple anodes 11 and cathodes 12, which are staggered and stacked together. It also includes a separator 13: by replacing the traditional rubber-wrapped design with a separator 13, the energy density of the battery cell can be effectively improved by 0.3%-0.6%, while effectively solving the problem of the separator 13 falling onto the sealing edge during battery cell installation. This almost eliminates the possibility of the separator 13 falling onto the sealing edge and causing poor battery cell installation. The separator 13 is positioned between the anodes 11 and cathodes 12 and extends to both ends. Both ends of the separator 13 are longer than the ends of the anodes 11 to better cover the anodes 11 and cathodes 12 within the separator 13, ensuring that electron ionization occurs entirely within the separator 13, thereby improving energy conversion efficiency. Multiple separators 13 extend beyond the two ends of the anodes 11 and cathodes 12 and overlap each other. Each overlapping portion of the separator 13 is provided with a locking mark 14, which mainly serves to… The multiple diaphragms 13 are bound together by a locking mechanism instead of a rubber wrapping, which helps prevent the diaphragms 13 from shrinking during heat generation in the battery cell. It also prevents the anode 11 and cathode 12 from coming into contact and causing a short circuit. The locking mechanism 14 binds the multiple diaphragms 13 together, with at least one locking mechanism 14 on the same side. The two ends of the stacked anode 11 extend beyond the cathode 12 by 0.1-1 mm, and the two ends of the diaphragms 13 extend beyond the anode 11 by 0.3-20 mm. The locking mark 14 is formed by hot melting of the overlapping part of the diaphragm 13. The interval between two adjacent locking marks 14 in the same group is 0.1-10mm. The port of the diaphragm 13 is cut to form a distance of 0.2-10mm from the port of the anode 11. The distance between the port of the diaphragm 13 and the locking mark 14 is 0.1-5mm. The port of the diaphragm 13 is bent upward from the position of the locking mark 14 and overlapped on the surface of the diaphragm 13 to form a locking edge structure. The vertical distance between the uppermost part of the overlapping part of the diaphragm 13 and the uppermost part of the anode 11 is greater than 0.

[0026] A battery casing, wherein the battery cell body 1 is disposed inside the casing body 2.

[0027] Working principle: By replacing the traditional adhesive wrapping design with a diaphragm 13, the energy density of the battery cell can be effectively improved by 0.3%-0.6%. It also effectively solves the problem of the diaphragm 13 falling onto the sealing edge during cell assembly, virtually eliminating the possibility of poor cell assembly caused by the diaphragm 13 falling onto the sealing edge. Furthermore, both ends of the diaphragm 13 are longer than the ends of the anode 11, allowing for better coverage of the anode 11 and cathode 12 within the diaphragm 13, ensuring that electron ionization occurs entirely within the diaphragm 13, thereby improving energy conversion efficiency. The locking seal 14 primarily serves to replace the adhesive wrapping in defining the multiple diaphragms 13, which is beneficial... To prevent the diaphragm 13 from shrinking during heat generation and to prevent the anode 11 and cathode 12 from coming into contact and causing a short circuit; cutting the diaphragm 13 further limits the distance between the two ends of the anode 11 and the two ends of the diaphragm 13, further reducing the possibility of a short circuit between the anode 11 and the cathode 12; shaping the diaphragm 13 so that the distance between one side of the diaphragm 13 and the anode 11 is greater than 0, which helps to prevent the untangled diaphragm 13 from falling on the sealing edge of the housing body 2 when the cell body 1 is placed in the housing body 2, thus affecting the sealing reliability of the cell.

Claims

1. An electric cell comprising an electric cell body (1), characterized in that: The electric core body (1) comprises a plurality of anodes (11) and cathodes (12), wherein the anodes (11) and the cathodes (12) are alternately arranged and stacked together; Further comprising a diaphragm (13): the diaphragm (13) is arranged between the anode (11) and the cathode (12) and extends at both ends, a plurality of diaphragms (13) extend out of the two end port parts of the anode (11) and the cathode (12) and are stacked together, and the two end stacked parts of the diaphragm (13) are provided with a locking mark (14), wherein the locking mark (14) composites a plurality of diaphragms (13) together; the number of locking marks (14) on the same side is at least 1; the distance between the two ends of the anode (11) extending out of the cathode (12) stacked together is 0.1-1mm, and the size of the diaphragm (13) exceeding the two ends of the anode (11) by 0.3-20mm at both ends; the locking mark (14) is formed by heat melting at the stacked part of the diaphragm (13); the interval between the two adjacent locking marks (14) in the same group is 0.1-10mm; the diaphragm (13) is cut at the port to form a distance of 0.2-10mm from the anode (11) port; the distance between the diaphragm (13) port and the locking mark (14) is 0.1-5mm.

2. The cell of claim 1, wherein: The diaphragm (13) port is bent upwards from the locking mark (14) position and is laminated on the surface of the diaphragm (13) to form a locking edge structure, wherein the vertical distance between the uppermost end of the diaphragm (13) laminated part and the uppermost end of the anode (11) is greater than 0.

3. A battery case characterized by: The electric core body (1) is arranged in the inside of the shell body (2).

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