Battery housing and battery

Abstract

The utility model relates to a battery shell and battery, wherein the battery shell comprises a plastic main casing with a cavity, a plastic cover plate with an opening and an alumina fiber shell, the main casing is provided with an opening towards one side, the plastic cover plate can be connected to the opening of the main casing through hot melting, and the alumina fiber shell is arranged around the plastic main casing. The main casing is in a cylindrical shape, and the opening of the main casing is arranged at the end position of one side of the main casing; the alumina fiber shell is arranged around the cylindrical surface of the main casing; wherein the battery comprises the above battery shell, an electric core, a positive electrode current collector and a negative electrode current collector. The battery shell and battery disclosed by the utility model have high safety performance.

Description

Technical Field

[0001] This utility model relates to a battery casing and a battery, and more particularly to a battery casing and a battery with high safety. Background Technology

[0002] Cylindrical batteries typically use metal casings such as steel or aluminum, and the top cover is usually sealed to the main casing using peripheral welding. However, peripheral welding requires high precision in the assembly of structural components, which can easily lead to incomplete or missing welds, resulting in poor sealing and posing safety hazards in battery manufacturing and use. Furthermore, the high cost of welding equipment increases battery production costs and reduces the product's market competitiveness.

[0003] Therefore, improvements to existing batteries are needed. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a battery casing and a battery.

[0005] One objective of this invention is to provide a battery casing, comprising a hollow plastic main casing, an open plastic cover, and an alumina fiber shell. The main casing has an opening on one side, and the plastic cover can be heat-fused to the opening of the main casing. The alumina fiber shell surrounds the plastic main casing. The main casing is cylindrical, and the opening is located at one end of the main casing; the alumina fiber shell surrounds the cylindrical surface of the main casing.

[0006] Compared to existing battery casing technologies, this solution replaces the casing material with plastic. Therefore, the plastic cover and the main plastic casing can be fixed together via ultrasonic heat fusion, eliminating and reducing the risk of welding slag. Simultaneously, the addition of alumina fiber wrapping to the plastic casing allows it to withstand short-term temperatures up to 1800℃, improving the battery casing's resistance to acids and alkalis, oxidation, and stability in highly corrosive environments. Furthermore, the alumina fiber shell also features low thermal conductivity and a low coefficient of thermal expansion, contributing to improved battery casing performance.

[0007] A second objective of this invention is to provide a battery comprising the aforementioned battery casing, a battery cell, a positive current collector, and a negative current collector. The positive current collector is connected to the positive tab of the battery cell, and the negative current collector is connected to the negative tab of the battery cell. The battery cell, the positive current collector, and the negative current collector are placed in the cavity of the main casing, with the positive protrusion of the positive current collector and the negative protrusion of the negative current collector extending out of the main casing. The negative current collector includes a negative base plate and a negative protrusion fixed to the surface of the negative base plate, the negative base plate and the negative protrusion being integrally formed. The positive current collector includes a positive base plate and a positive protrusion fixed to the surface of the positive base plate. The positive base plate is provided with an injection port for injecting electrolyte into the battery cell. The positive base plate and the positive protrusion are designed separately, and after the electrolyte is injected into the battery cell, the positive base plate and the positive protrusion are fixed together by welding.

[0008] Referring to the attached diagram, the positive base of the positive current collector and the negative base of the negative current collector are provided with arc-shaped connecting grooves. The positive electrode tab of the battery cell is inserted into the connecting groove of the positive base and then fixed by welding. The negative electrode tab of the battery cell is inserted into the connecting groove of the negative base and then fixed by welding. In this way, the contact area between the battery cell tab and the current collector is increased, thereby increasing the current carrying capacity.

[0009] The cylindrical surfaces of the positive electrode protrusion and the negative electrode protrusion are respectively provided with threads. The positive electrode protrusion is screwed with a first nut, and the negative electrode protrusion is screwed with a second nut.

[0010] To ensure insulation between the various components, a first insulating sealing sheet, a second insulating sealing sheet, a third insulating sealing sheet, and a fourth insulating sealing gasket should be installed. The first insulating sealing sheet is installed at the positive electrode protrusion to insulate the positive electrode protrusion and the plastic cover plate; the second insulating sealing sheet is installed at the negative electrode protrusion to insulate the negative electrode protrusion and the main housing; the third insulating sealing sheet is fitted onto the positive electrode protrusion and fixed by the first nut; and the fourth insulating sealing sheet is fitted onto the negative electrode protrusion and fixed by the second nut.

[0011] This utility model has the following technical effects:

[0012] (1) Compared with the existing battery casing, the metal material is replaced with plastic material, so the main casing and the cover plate can be connected by ultrasonic heat fusion, eliminating the risk of welding slag falling into the battery, which reduces the battery cost and improves the battery safety at the same time.

[0013] (2) While changing the material, an alumina fiber shell was added, which can withstand high temperature in the short term, improve the stability of performance in a strong corrosive environment, and improve the battery strength. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the plastic cover plate and the plastic main shell;

[0015] Figure 2 This is a schematic diagram of the alumina fiber shell structure;

[0016] Figure 3 This is a schematic diagram of the positive electrode protrusion.

[0017] Figure 4 This is a schematic diagram of the positive electrode chassis structure;

[0018] Figure 5 This is a schematic diagram of the negative electrode current collector.

[0019] Figure 6 This is an exploded view of the battery structure.

[0020] In the diagram, 00 is the battery; 100 is the battery casing; 101 is the main casing; 102 is the plastic cover; 103 is the alumina fiber shell; 200 is the battery cell; 300 is the positive current collector; 301 is the positive electrode protrusion; 302 is the positive electrode base; 400 is the negative current collector; 401 is the negative electrode protrusion; 402 is the negative electrode base; 501 is the first insulating sealing sheet; 502 is the second insulating sealing sheet; 503 is the third insulating sealing sheet; 504 is the fourth insulating sealing sheet; 601 is the first nut; and 602 is the second nut. Detailed Implementation

[0021] The principles and features of this utility model are described below with reference to the embodiments; the examples given are only for explaining this utility model and are not intended to limit the scope of this utility model. Example

[0022] A battery casing 100 includes a plastic main casing 101, a plastic cover plate 102, and an alumina fiber shell 103. In this embodiment, the main casing 101 is cylindrical, with an opening on one end face. A cavity is provided inside the main casing 101, through which the battery cell 200 can enter the cavity. The plastic cover plate 102 covers the opening of the main casing 101, sealing the cavity. The plastic cover plate 102 may have an opening for the positive electrode protrusion 301 of the positive electrode current collector 300 to pass through. The plastic cover plate 102 is fixed to the main casing 101 by ultrasonic melting. The alumina fiber shell 103 surrounds the cylindrical surface of the main casing 101. Example

[0023] A battery 00 includes a battery casing 100, a battery cell 200, a positive current collector 300, and a negative current collector 400, as described in Embodiment 1. Referring to the accompanying drawings, both the positive current collector 300 and the negative current collector 400 are composed of two parts. The positive current collector 300 is a separate design, including a positive base 302 and a positive protrusion 301 fixed to the surface of the positive base 302. The negative current collector 400 is a one-piece design, including a negative base 402 and a negative protrusion 401 fixed to the surface of the negative base 402. The positive current collector 300 is designed as a separate unit because it is used to inject electrolyte into the battery cell 200. As shown in the accompanying drawings, the positive base 302 has an injection port 303. After the electrolyte injection is completed, the positive protrusion 301 is welded to the positive base 302 to seal the injection port 303. In common battery cell designs, the tabs are fixed to the positive and negative current collectors by spot welding. In this design, to increase the contact area between the tabs and the positive and negative current collectors 300 and 400, circular grooves are provided on both the positive and negative current collectors. The positive tab passes through the groove in the positive current collector 300 and is welded in place; similarly, the negative tab passes through the groove in the negative current collector 400 and is welded in place. External threads are provided on the outer cylindrical surfaces of the positive and negative protrusions 301 and 401, respectively. A first nut 601 is screwed onto the positive protrusion 301, and a second nut 602 is screwed onto the negative protrusion 401. Meanwhile, to meet insulation requirements, the battery 00 also includes a first insulating sealing sheet 501, a second insulating sealing sheet 502, a third insulating sealing sheet 503, and a fourth insulating sealing sheet 504. The first and second insulating sealing sheets 501 and 502 are stepped, while the third and fourth insulating sealing sheets 503 and 504 are flat gaskets. The first insulating sealing sheet 501 is located at the positive electrode protrusion 301 to insulate the positive electrode protrusion 301 from the plastic cover plate 102. The second insulating sealing sheet 502 is located at the negative electrode protrusion 401 to insulate the negative electrode protrusion 401 from the main housing 101. The third insulating sealing sheet 503 is fitted onto the positive electrode protrusion 301 and fixed by a first nut 601, and the fourth insulating sealing sheet 504 is fitted onto the negative electrode protrusion 401 and fixed by a second nut 602.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., 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 battery casing, characterized in that, include: A hollow plastic main housing (101) has an opening on one side; A plastic cover (102) with an opening, the plastic cover (102) being heat-fused to the opening of the main housing (101); An alumina fiber shell (103) is arranged around the plastic main shell (101).

2. The battery casing according to claim 1, characterized in that, The main shell (101) is cylindrical, and the opening of the main shell (101) is located at the end of one side of the main shell (101); the alumina fiber shell (103) is arranged around the cylindrical surface of the main shell (101).

3. A battery, the battery (00) comprising the battery casing (100) as described in claim 1 or 2.

4. The battery according to claim 3, characterized in that, It also includes a battery cell (200), a positive current collector (300) and a negative current collector (400). The positive current collector (300) is connected to the positive tab of the battery cell (200), and the negative current collector (400) is connected to the negative tab of the battery cell (200). The battery cell (200), the positive current collector (300) and the negative current collector (400) are placed in the cavity of the main housing (101). The positive protrusion (301) of the positive current collector (300) and the negative protrusion (401) of the negative current collector (400) extend out of the main housing (101).

5. The battery according to claim 4, characterized in that, The negative electrode current collector (400) includes a negative electrode base plate (402) and a negative electrode protrusion (401) fixed on the surface of the negative electrode base plate (402), and the negative electrode base plate (402) and the negative electrode protrusion (401) are integrally formed.

6. The battery according to claim 5, characterized in that, The positive electrode current collector (300) includes a positive electrode base plate (302) and a positive electrode protrusion (301) fixed on the surface of the positive electrode base plate (302). The positive electrode base plate (302) is provided with an injection port (303) for injecting liquid into the cell (200). The positive electrode base plate (302) and the positive electrode protrusion (301) are designed separately.

7. The battery according to claim 6, characterized in that, It also includes a first insulating sealing sheet (501) and a second insulating sealing sheet (502); the first insulating sealing sheet (501) is disposed at the positive electrode protrusion (301) and is used to insulate the positive electrode protrusion (301) and the plastic cover plate (102); the second insulating sealing sheet (502) is disposed at the negative electrode protrusion (401) and is used to insulate the negative electrode protrusion (401) and the main housing (101).

8. The battery according to claim 7, characterized in that, It also includes a first nut (601) and a second nut (602), the first nut (601) being screwed to the positive electrode protrusion (301) and the second nut (602) being screwed to the negative electrode protrusion (401).

9. The battery according to claim 8, characterized in that, It also includes a third insulating sealing sheet (503) and a fourth insulating sealing sheet (504). The third insulating sealing sheet (503) is sleeved on the positive electrode protrusion (301) and fixed by the first nut (601). The fourth insulating sealing sheet (504) is sleeved on the negative electrode protrusion (401) and fixed by the second nut (602).

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