Cylindrical battery cover plate assembly

Abstract

The utility model discloses a cylindrical battery cover plate assembly. The cylindrical battery cover plate assembly can be applied to the technical field of battery protection, the cylindrical battery cover plate assembly comprises a confluence disc and a cover plate, the confluence disc is arranged to be of a circular structure with a sunken interior and a turned-over edge on the outer side, and the turned-over edge on the outer side is welded to the circumference of the cover plate and used for increasing the overcurrent sectional area of the confluence disc and the cover plate so as to improve the overcurrent capacity. According to the scheme, the stability of the cylindrical battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery protection technology, and in particular to a cylindrical battery cover assembly. Background Art

[0002] Cylindrical lithium battery is a lithium battery with an overall cylindrical shape. Cylindrical lithium battery is a battery type that has been studied, analyzed, and discussed technically. Cylindrical lithium battery is mainly composed of positive electrode, negative electrode, diaphragm, positive and negative collector, valve, overcurrent protection device, insulation and shell. Cylindrical lithium battery mainly includes lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary material lithium battery. Each cylindrical lithium battery has different advantages. The battery is commonly used in laptops, digital cameras, lighting equipment, children's toy products, pneumatic tools, new energy vehicles, portable mobile energy and other fields.

[0003] Cylindrical batteries are relatively stable under normal circumstances, but when they are charged and discharged at high rates, the overcurrent cross-sectional area limitation of the busbar and cover causes the temperature rise of the battery cells to increase, thereby increasing the possibility of thermal runaway of the battery, resulting in reduced battery stability. Utility Model Content

[0004] Based on this, it is necessary to provide a cylindrical battery cover assembly that can improve the stability of cylindrical batteries in response to the above technical problems.

[0005] In a first aspect, the present application provides a cylindrical battery cover plate assembly, comprising a busbar and a cover plate;

[0006] The busbar is configured as a circular structure with an inner depression and an outer flange, and the outer flange is welded to the circumference of the cover plate to increase the flow cross-sectional area of ​​the busbar and the cover plate to increase the flow capacity.

[0007] In one of the embodiments, the cover plate is provided with explosion-proof holes;

[0008] The explosion-proof holes are used to control the directional ejection of splashes inside the cylindrical battery when thermal runaway occurs.

[0009] In one of the embodiments, the cylindrical battery cover assembly is provided with two steps at the location of the explosion-proof hole.

[0010] In one embodiment, the lower step of the two steps is used to place the explosion-proof valve plate;

[0011] The explosion-proof valve sheet is welded on the cover plate and is used for directional splashing of splashing materials in the cylindrical battery when thermal runaway occurs in the cylindrical battery.

[0012] In one embodiment, the upper step of the two steps is used to place the explosion-proof valve guard;

[0013] The explosion-proof valve guard plate is connected to the cover plate by interference fit, which is used to protect the explosion-proof valve plate from being damaged during transportation and assembly.

[0014] In one embodiment, the cylindrical battery cover plate assembly is provided with two steps on the outer side of the cover plate;

[0015] The upper step of the two steps is welded to the busbar, and the lower step of the two steps is welded to the outer shell of the cylindrical battery.

[0016] In one embodiment, a liquid injection hole is provided at the center of the cover plate, and a circular hole is provided at the center of the manifold;

[0017] The injection hole and the center of the circular hole are located on a straight line and are used for injecting electrolyte.

[0018] In one embodiment, a preset number of evenly distributed through grooves are disposed on the outer side of the busbar.

[0019] The cylindrical battery cover assembly includes a busbar and a cover; the busbar is configured as a circular structure with an internal depression and a flange on the outside, and the flange on the outside is welded to the circumference of the cover, which is used to increase the flow cross-sectional area of ​​the busbar and the cover to increase the flow capacity. Compared with the existing cylindrical battery cover assembly, the cylindrical battery cover assembly of the present application greatly increases the flow cross-sectional area of ​​the busbar and the cover in the connection method and respective settings of the busbar and the cover, reduces the heat generation power of the cylindrical battery, and achieves the technical effect of improving the stability of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional front view of a cylindrical battery cover assembly in one embodiment;

[0021] Figure 2 A front top view of a cover plate in one embodiment;

[0022] Figure 3 A top view of a busbar in one embodiment;

[0023] Figure 4 A front top view of an explosion-proof valve disc in one embodiment;

[0024] Figure 5 It is a front top view of an explosion-proof valve guard plate in one embodiment.

[0025] Marking instructions: 1-cover plate; 2-manifold; 3-explosion-proof valve plate; 4-explosion-proof valve guard plate; 11-explosion-proof hole; 12-liquid injection hole; 21-round hole; 22-through groove. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] Cylindrical lithium battery is a lithium battery with an overall cylindrical shape. Cylindrical lithium battery is a battery type that has been studied, analyzed, and discussed technically. Cylindrical lithium battery is mainly composed of positive electrode, negative electrode, diaphragm, positive and negative collector, valve, overcurrent protection device, insulation and shell. Cylindrical lithium battery mainly includes lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary material lithium battery. Each cylindrical lithium battery has different advantages. The battery is commonly used in laptops, digital cameras, lighting equipment, children's toy products, pneumatic tools, new energy vehicles, portable mobile energy and other fields.

[0028] Cylindrical batteries are relatively stable under normal circumstances, but when they are charged and discharged at a high rate, the overcurrent cross-sectional area of ​​the busbar and the cover plate increases the temperature rise of the battery cell, thereby increasing the possibility of thermal runaway of the battery, resulting in reduced stability of the battery. Based on this, the embodiment of the present application provides a cylindrical battery cover plate assembly to improve the above technical problems.

[0029] In one embodiment, Figure 1 is a front cross-sectional view of a cylindrical battery cover assembly provided according to an embodiment of the present application, Figure 2 A top view of a cover plate in one embodiment is shown. Figure 3 A top view of a busbar in one embodiment is shown. Figure 4 A front top view of an explosion-proof valve disc in one embodiment, Figure 5 A front top view of an explosion-proof valve guard in one embodiment, combined with Figure 1-Figure 5 The cylindrical battery cover assembly includes a cover 1 and a busbar 2. The busbar 2 is configured as a circular structure with an internal depression and an outer flange, and the outer flange is welded to the circumference of the cover 1 to increase the current cross-sectional area of ​​the busbar 2 and the cover 1 to increase the overcurrent capacity.

[0030] It should be noted that the busbar 2 is circular in shape and is made of metal materials such as copper, aluminum, etc. The embodiment of the present application does not limit the type of material of the busbar 2. The cover plate 1 and the outer flange of the busbar 2 are welded. This design can increase the flow cross-sectional area between the cover plate 1 and the busbar 2, greatly increasing the welding strength. It also reduces the heat generation power of the cylindrical battery and improves the stability of the cylindrical battery.

[0031] Optionally, the cylindrical battery cover plate assembly is provided with two steps at the location of the explosion-proof hole. The lower step of the two steps is used to place the explosion-proof valve plate 3; the explosion-proof valve plate 3 is welded to the cover plate, and is used for directional splashing of splashes in the cylindrical battery when thermal runaway occurs in the cylindrical battery. The upper step of the two steps is used to place the explosion-proof valve guard plate 4; the explosion-proof valve guard plate 4 is connected to the cover plate 1 by interference fit, and is used to protect the explosion-proof valve plate 3 from being damaged during transportation and assembly.

[0032] It should be noted that the explosion-proof valve plate 3 and the explosion-proof valve guard plate 4 can be made of stainless steel or copper alloy, and the embodiment of the present application does not limit the type of material of the explosion-proof valve plate 3 and the explosion-proof valve guard plate 4. The combination of the explosion-proof valve plate 3 and the explosion-proof valve guard plate 4 is used to protect the cylindrical battery to prevent the splashing of the splashing material in the cylindrical battery when the cylindrical battery has thermal runaway, thereby protecting personal safety.

[0033] Optionally, the cover plate 1 is provided with an explosion-proof hole 11, which is used to control the splashes in the battery to be ejected in a directional manner when thermal runaway occurs in the cylindrical battery.

[0034] Optionally, the cylindrical battery cover plate assembly is provided with two steps on the outer side of the cover plate 1, the upper step of the two steps is welded to the busbar 2, and the lower step of the two steps is welded to the outer shell of the cylindrical battery (not shown in the figure).

[0035] It should be noted that the outer shell 3 is made of metal, such as steel, aluminum, etc. The embodiment of the present application does not limit the type of material of the inner side of the cover plate 1 and the inner step and the outer shell 3.

[0036] Optionally, a liquid injection hole 12 is provided at the center of the cover plate 1, and a circular hole 21 is provided at the center of the busbar 2. The centers of the liquid injection hole 12 and the circular hole 21 are located in a straight line for injecting electrolyte. The circular hole in the center of the busbar can also make the splashing channel of the battery smooth when thermal runaway occurs. In addition, the circular hole 21 and the liquid injection hole 12 can also release the heat released inside the cylindrical battery to prevent the splashing of the splashing material inside the cylindrical battery when the cylindrical battery has thermal runaway.

[0037] Optionally, a preset number of evenly distributed through grooves 22 are provided on the outer side of the busbar 2 .

[0038] It should be noted that the busbar is a circular structure with a depression inside, and a through groove 22 is provided on the plane of the circular structure to buffer the stress generated when it is subjected to external impact or when its winding core part expands due to heat.

[0039] The cylindrical battery cover assembly includes a busbar and a cover. The busbar is configured as a circular structure with an internal depression and a flange on the outside, and the flange on the outside is welded to the circumference of the cover to increase the flow cross-sectional area of ​​the busbar and the cover to increase the flow capacity. Compared with the existing cylindrical battery cover assemblies, the cylindrical battery cover assembly of the present application greatly increases the flow cross-sectional area of ​​the busbar and the cover by the connection method and respective settings of the busbar and the cover, reduces the heat generation power of the cylindrical battery, and achieves the technical effect of improving the stability of the cylindrical battery.

[0040] It should be noted that the information involved in this application (including but not limited to the information related to the cylindrical battery cover assembly in this application, etc.) are all information or data fully authorized by all parties.

[0041] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A cylindrical battery cover assembly, characterized in that: The cylindrical battery cover plate assembly comprises a busbar and a cover plate; The busbar is configured as a circular structure with an inner depression and an outer flange, and the outer flange is welded to the circumference of the cover plate to increase the flow cross-sectional area of ​​the busbar and the cover plate to increase the flow capacity.

2. The cylindrical battery cover assembly according to claim 1, characterized in that: The cover plate is provided with explosion-proof holes; The explosion-proof hole is used to control the splashing material in the cylindrical battery to be ejected in a directional manner when thermal runaway occurs.

3. The cylindrical battery cover assembly according to claim 2, characterized in that: The cylindrical battery cover plate assembly is provided with two steps at the position of the explosion-proof hole.

4. The cylindrical battery cover assembly according to claim 3, characterized in that: The lower step of the two steps is used for placing the explosion-proof valve plate; The explosion-proof valve sheet is welded on the cover plate and is used for directional splashing of splashes in the cylindrical battery when thermal runaway occurs in the cylindrical battery.

5. The cylindrical battery cover assembly according to claim 3, characterized in that: The upper step of the two steps is used for placing the explosion-proof valve guard plate; The explosion-proof valve guard plate is connected to the cover plate by interference fit, and is used to protect the explosion-proof valve plate from being damaged during transportation and assembly.

6. The cylindrical battery cover assembly according to claim 1, characterized in that: The cylindrical battery cover plate assembly is provided with two steps on the outer side of the cover plate; The upper step of the two steps is welded to the busbar, and the lower step of the two steps is welded to the outer shell of the cylindrical battery.

7. The cylindrical battery cover assembly according to claim 1, characterized in that: The center position of the cover plate is provided with a liquid injection hole, and the center position of the manifold is provided with a circular hole; The injection hole and the center of the circular hole are located on a straight line and are used for injecting electrolyte.

8. The cylindrical battery cover assembly according to claim 1, characterized in that: The outer side of the busbar is provided with a preset number of evenly distributed through grooves.

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