Short-circuit-proof battery cell structure

Abstract

The utility model discloses an anti-short-circuit cell structure, which relates to the technical field of lithium ion batteries and comprises a cell bag, an aluminum shell sleeved outside the cell bag, an inner insulating film arranged between the cell bag and the aluminum shell, first isolation insulating layers arranged between the front surface and the back surface of the cell bag and the inner insulating film, and a top cover mounted at the top of the aluminum shell, top cover pins are arranged at the two ends of the top cover and connected to the positive electrode lug and the negative electrode lug of the core package, and a second isolation insulating layer is arranged between the top cover pins and the inner insulating film. According to the utility model, the first isolation insulating layers are arranged on the front surface and the back surface of the core package, so that laser leaked from a gap between the top cover and the core package is blocked when the top cover and the aluminum shell are subjected to laser welding, and short circuit caused by burning a battery cell by the leaked laser is avoided. And the second isolation insulating layer is arranged at the joint of the top cover pin and the positive and negative tabs of the core package, so that welding burrs or bulges formed by the pin and the positive and negative tabs which are conducted by laser welding are attached, and the phenomenon that the welding burrs or bulges pierce an inner insulating film to cause short circuit of the battery core is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically to a short-circuit-proof cell structure. Background Technology

[0002] As a core component of modern energy technology, battery cells have a wide range of applications. Among them, hard-shell battery cells are mainly used in electric vehicles, hybrid vehicles, and energy storage systems, while soft-pack battery cells are mainly used in portable electronic devices such as smartphones, tablets, and Bluetooth headsets.

[0003] As market demand for battery cells continues to grow, people are also demanding higher performance from them. Short circuits are a major cause of problems affecting battery cell performance, and short circuits are divided into internal short circuits and external short circuits.

[0004] Regarding internal short circuits, existing hard-shell battery cells lack sufficient internal protection, leading to short circuits or micro-short circuits within the cells. Short circuits accelerate battery aging and degradation, shorten battery life, and reduce the overall performance of the battery pack. Furthermore, internal short circuits cause excessive discharge of the cell current, generating a large amount of heat and forming a large amount of gas inside. This excessive internal pressure can cause the battery pack to spontaneously combust, and in severe cases, it can lead to an explosion, posing a safety risk. Utility Model Content

[0005] To address the problems of existing hard-shell battery cells having internal short circuits or micro-short circuits, which lead to battery aging, degradation, and a decline in the overall performance of the battery pack, as well as the risk of battery pack spontaneous combustion and other safety hazards, this utility model provides a short-circuit resistant battery cell structure.

[0006] The technical solution adopted by this utility model is as follows: a short-circuit resistant battery cell structure, including a core package, an aluminum shell covering the core package, an inner insulating film between the core package and the aluminum shell, a first insulating layer between the front and back of the core package and the inner insulating film, a top cover installed on the top of the aluminum shell, top cover pins at both ends of the top cover, the two top cover pins being connected to the positive and negative tabs of the core package respectively, and a second insulating layer between the two top cover pins and the inner insulating film.

[0007] Furthermore, the first insulating layer is made of insulating black tape, with one end attached to the side of the top cover and the other end attached to the outer surface of the core package.

[0008] Furthermore, the second insulating layer is also made of insulating black tape, which is attached to the connection between the top cover pin and the corresponding positive or negative tab.

[0009] Furthermore, a top insulating sheet is installed on the top of the top cover.

[0010] Furthermore, the top cover is provided with an explosion-proof valve for pressure relief, and the top insulating sheet is provided with an explosion-proof valve clearance hole.

[0011] Furthermore, an outer insulating film is installed on the outer surface of the aluminum shell.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0013] This short-circuit protection cell structure employs a first insulating layer on both the front and back of the cell package. This layer blocks laser light leaking from the gap between the top cover and the cell package during laser welding of the top cover and aluminum shell, preventing the leaked laser from burning the cell and causing a short circuit. A second insulating layer is then placed at the connection points between the top cover pins and the positive and negative tabs of the cell package. This layer adheres to any welding burrs or protrusions formed during laser welding of the pins and tabs, preventing these burrs or protrusions from piercing the inner insulating film and causing a short circuit. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A three-dimensional structural schematic diagram provided for an embodiment of this utility model;

[0016] Figure 2 for Figure 1 Exploded view.

[0017] Figure description: 1. Core package; 2. Inner insulating film; 3. Aluminum shell; 4. Top cover; 5. Top cover pins; 6. First insulating layer; 7. Second insulating layer; 8. Top insulating sheet; 9. Outer insulating film. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] The following is combined with Figures 1-2 This utility model will be described in detail.

[0022] Example

[0023] like Figure 1 and Figure 2 As shown, a short-circuit resistant battery cell structure includes a cell pack 1, which is composed of multiple individual battery cells, such as... Figure 2 As shown in the diagram, a core package 1 with two individual battery cells is used as an example. The core package 1 is encased in an aluminum shell 3. The aluminum shell 3 protects the internal core package 1 from external impacts and mechanical damage, prevents cell leakage, and has good thermal conductivity, effectively improving the heat dissipation performance of the battery cell, helping to cool the cell and maintain its stable performance. An inner insulating film 2 is provided between the core package 1 and the aluminum shell 3, serving as an insulating barrier between the two to prevent short circuits that could damage the battery cell.

[0024] A top cover 4 is installed on the top of the aluminum shell 3. The top cover 4 is laser-welded to the aluminum shell 3 to wrap and fix the battery cell and achieve a sealing function. However, during the laser welding of the top cover 4 and the aluminum shell 3, the laser can pass through the gap between the top cover 4 and the aluminum shell 3, burning the battery cell and causing a short circuit.

[0025] Therefore, this utility model provides a first insulating layer 6 between the front and back of the core package 1 and the inner insulating film 2 to block the laser that leaks through the gap between the two, so as to prevent the leaked laser from burning the battery cell and causing a short circuit.

[0026] The first insulating layer 6 is preferably made of insulating black tape. One end is attached to the side of the top cover 4 and the other end is attached to the outer surface of the core package 1, thereby covering the gap between the top cover 4 and the aluminum shell 3 more comprehensively, so that the leakage laser during the laser welding will not burn the battery cell and cause a short circuit.

[0027] like Figure 2 As shown, both ends of the top cover 4 are provided with top cover pins 5, which are connected to the positive and negative tabs of the core package 1, respectively. The top cover pins 5 of the top cover 4 are welded to the tabs of the battery cell to ensure the conduction of the charging and discharging current of the battery cell. However, because the top cover pins 5 are welded to the tabs of the battery cell, the welding burrs or protrusions generated after welding can easily pierce the inner insulating film 2, causing a short circuit.

[0028] Therefore, this utility model provides a second insulating layer 7 between the two top cover pins 5 and the inner insulating film 2. The welding burrs or protrusions generated by welding are attached by the second insulating layer 7 to prevent them from piercing the inner insulating film 2 and contacting the aluminum shell 3, causing a short circuit and damaging the battery cell.

[0029] The second insulating layer 7 is preferably made of insulating black tape and is attached to the connection between the top cover pin 5 and the corresponding positive or negative tab. This prevents welding burrs or protrusions generated after the top cover pin 5 is soldered to the positive or negative tab of the battery cell from piercing the inner insulating film 2, thereby avoiding short circuits.

[0030] like Figure 1 As shown, a top insulating sheet 8 is installed on the top of the top cover 4. The top insulating sheet 8 also serves as insulation and protection, preventing the top cover 4 from coming into contact with external wiring and causing a short circuit.

[0031] In addition, an explosion-proof valve can be installed on the top cover 4. When an abnormality occurs in the internal battery cell and the internal air pressure increases to a certain value, the explosion-proof valve on the top cover 4 will open to release pressure and prevent excessive internal pressure from causing an explosion. An explosion-proof valve clearance hole is provided on the top insulating sheet 8.

[0032] like Figure 1 As shown, an outer insulating film 9 is installed on the outer surface of the aluminum shell 3. The outer insulating film 9 can ensure the isolation of the battery cell from the external environment and prevent short circuit problems caused by the influence of the external environment.

[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A short-circuit resistant battery cell structure, comprising a core package (1), characterized in that: The core package (1) is covered with an aluminum shell (3). An inner insulating film (2) is provided between the core package (1) and the aluminum shell (3). A first insulating layer (6) is provided between the front and back of the core package (1) and the inner insulating film (2). A top cover (4) is installed on the top of the aluminum shell (3). Top cover pins (5) are provided at both ends of the top cover (4). The two top cover pins (5) are respectively connected to the positive and negative tabs of the core package (1). A second insulating layer (7) is provided between the two top cover pins (5) and the inner insulating film (2).

2. The short-circuit resistant cell structure according to claim 1, characterized in that: The first insulating layer (6) is made of insulating black tape, with one end attached to the side of the top cover (4) and the other end attached to the outer surface of the core package (1).

3. The short-circuit resistant cell structure according to claim 1, characterized in that: The second insulating layer (7) is also made of insulating black tape and is attached to the connection between the top cover pin (5) and the corresponding positive or negative tab.

4. The short-circuit resistant cell structure according to claim 1, characterized in that: A top insulating sheet (8) is installed on the top of the top cover (4).

5. The short-circuit resistant cell structure according to claim 4, characterized in that: The top cover (4) is provided with an explosion-proof valve for pressure relief, and the top insulating sheet (8) is provided with an explosion-proof valve clearance hole.

6. The short-circuit resistant cell structure according to claim 1, characterized in that: An outer insulating film (9) is installed on the outer surface of the aluminum shell (3).

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