Explosion-proof shell assembly and battery

Abstract

The utility model relates to an explosion-proof shell assembly and a battery. The explosion-proof shell assembly comprises a shell and a cover plate, the interior of the shell is used for accommodating a battery cell, and the shell is provided with at least one opening end; the cover plate seals the open end; wherein the cover plate and the shell are welded through a welding mark part, the welding mark part is provided with a notch, the notch is sealed through a sealing colloid, and the sealing colloid is configured to be broken to form a pressure relief opening when the internal pressure of the shell reaches a first pressure. The utility model also discloses a battery. According to the utility model, the reliability of pressure relief is effectively ensured, meanwhile, the pressure relief structure is more convenient to process, the processing cost is greatly reduced, and the use safety of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an explosion-proof housing component and a battery. Background Technology

[0002] Lithium-ion batteries boast advantages such as high energy density and long cycle life. As a highly efficient and environmentally friendly energy storage technology, they are widely used in electric vehicles, smartphones, aerospace, and medical devices. Existing lithium-ion batteries generally consist of a casing and a cover plate, with the cover plate connected to the casing opening to seal it. When a lithium-ion battery experiences overcharging, over-discharging, short circuits, or compression, it is prone to internal gas production, fire, or even explosion. To prevent these problems, an explosion-proof valve is typically installed on the cover plate. When the internal gas pressure of the lithium-ion battery becomes too high, the explosion-proof valve opens, allowing the gas inside the battery to escape, thus achieving pressure relief and explosion prevention. However, existing explosion-proof valves are difficult to manufacture and have high processing costs, failing to meet production requirements. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defects of the explosion-proof valve in the prior art, which is difficult to process and has a high processing cost.

[0004] To solve the above-mentioned technical problems, this utility model provides an explosion-proof housing assembly, comprising,

[0005] A housing, the interior of which is used to house the battery cell, the housing having at least one open end;

[0006] Cover plate, the cover plate closing the opening end;

[0007] The cover plate and the housing are welded together by a weld mark, which has a notch. The notch is sealed by a sealant, which is configured to rupture and form a pressure relief port when the internal pressure of the housing reaches a first pressure.

[0008] In one embodiment of this utility model, the housing is provided with open ends at both ends, and each open end is closed by a corresponding cover plate.

[0009] In one embodiment of this utility model, the shell is rectangular, and the weld mark portion is rectangular frame-shaped and has the notch.

[0010] In one embodiment of the present invention, the weld mark has at least two notches, each of which is sealed by the sealant.

[0011] In one embodiment of the present invention, at least two of the notches in each weld mark portion are oriented differently.

[0012] In one embodiment of this utility model, the explosion-proof housing assembly further includes a positive electrode and a negative electrode. The housing is a conductive element. The positive electrode is thermally fused to the housing through an insulating sheet, and the negative electrode is welded to the outer wall of the housing.

[0013] In one embodiment of this utility model, the housing is provided with a mounting hole, and the positive electrode includes a cylindrical part that extends through the insulating sheet into the mounting hole.

[0014] In one embodiment of the present invention, the explosion-proof housing assembly further includes a liquid-blocking plug, wherein the housing is provided with a liquid injection hole, and the liquid-blocking plug is connected to the housing and blocks the liquid injection hole.

[0015] This utility model also discloses a battery, including the explosion-proof housing assembly described in any of the above claims, wherein a battery cell is disposed inside the housing.

[0016] In one embodiment of this utility model, the battery cell is rectangular.

[0017] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0018] The explosion-proof housing assembly and battery described in this utility model achieve pressure relief by forming a pressure relief port with sealant. While effectively ensuring the reliability of pressure relief, it also makes the processing of the pressure relief structure more convenient, greatly reduces processing costs, and improves the safety of battery use. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the battery structure of this utility model;

[0021] Figure 2 yes Figure 1 Top view of the battery structure shown;

[0022] Figure 3 yes Figure 2 Right view of the battery structure shown;

[0023] Figure 4 yes Figure 2 Sectional view at point AA;

[0024] Figure 5 yes Figure 4 A magnified view of a section at point M;

[0025] Figure 6 yes Figure 4A magnified view of a portion of point N in the middle;

[0026] Figure 7 yes Figure 1 Exploded view of the battery structure shown;

[0027] Explanation of reference numerals on the accompanying drawings:

[0028] 10. Shell; 101. Open end; 102. Mounting hole; 103. Liquid injection hole;

[0029] 20. Cover plate;

[0030] 30. Weld mark; 301. Notch; 40. Sealing compound; 50. Positive electrode; 501. Column part; 60. Negative electrode; 70. Liquid plug; 80. Insulating sheet; 90. Gasket; 100. Battery cell. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure or its application or use.

[0032] In the description of this utility model, it should be understood that the terms "vertical," "upper," "lower," "top," "side," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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 the utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Example 1

[0035] See Figures 1-7 This embodiment discloses an explosion-proof housing assembly, including a housing 10 and a cover plate 20;

[0036] The housing 10 is used to accommodate the battery cell 100. The housing 10 has at least one open end 101, which has an opening to facilitate the placement of the battery cell 100.

[0037] The cover plate 20 closes the opening end 101 to keep the entire battery in a sealed state;

[0038] Among them, such as Figures 5-7 As shown, the cover plate 20 and the housing 10 are welded together by a weld mark 30. The weld mark 30 has a notch 301, which is sealed by a sealing compound 40. The sealing compound 40 is configured to rupture when the internal pressure of the housing 10 reaches a first pressure to form a pressure relief port.

[0039] When the battery experiences abnormal conditions such as overcharging, over-discharging, short circuit, or compression, a large amount of gas is generated inside the battery casing 10, causing the internal pressure of the casing 10 to increase rapidly. Since the strength of the sealing colloid 40 is relatively weak compared to the surrounding area, when the pressure increases to the first pressure, the pressure will cause the sealing colloid 40 to tear, thereby forming a pressure relief port and achieving pressure relief. Moreover, when the battery experiences the above-mentioned abnormal phenomena, in addition to the generation of a large amount of gas inside the casing 10, a large amount of heat is usually released, causing the battery temperature to rise rapidly. This temperature will also make it easier for the sealing colloid 40 to tear or melt and form the aforementioned pressure relief port, thereby achieving the purpose of pressure relief and explosion prevention.

[0040] The outer shell assembly of the above structure does not require grooves to be cut on the cover plate 20 to prepare the explosion-proof valve. Instead, pressure relief is achieved by forming a pressure relief port with sealant. The structure is simpler and the manufacturing process is simplified. This not only ensures the reliability of pressure relief but also makes the processing of the pressure relief structure more convenient and greatly reduces the processing cost.

[0041] The cover plate 20 and the housing 10 are welded together by penetration welding, and the weld mark 30 is formed between the cover plate 20 and the housing 10 after welding.

[0042] Penetration welding is a welding method that completely melts two or more workpieces using a welding heat source, forming them into a single unit. During penetration welding, the weld metal completely penetrates the workpieces, achieving a bent connection. Penetration welding does not require filler material; instead, it directly melts the base material using a high-energy heat source to achieve the weld.

[0043] In some embodiments, the opening 101 may be provided only at one end of the housing 10, or as follows: Figure 1 As shown, an opening end 101 is provided at both ends of the housing 10, and each opening end 101 is closed by a corresponding cover plate 20. Each cover plate 20 and the housing 10 are welded together through a weld mark 30.

[0044] Furthermore, such as Figure 7 As shown, the housing 10 is rectangular, and the weld mark portion 30 is rectangular and has a notch 301. During welding, welding can be performed around the edge of the housing 10 to form a rectangular weld mark portion 30. The welding path is not closed to leave the aforementioned notch 301.

[0045] In some embodiments, the explosion-proof housing assembly further includes a positive electrode 50 and a negative electrode 60, the housing 10 is a conductive element, the positive electrode 50 is thermally fused to the housing 10 via an insulating sheet 80, and the negative electrode 60 is welded to the outer wall of the housing 10.

[0046] In the above structure, the shell 10 and the negative electrode plate are used as a whole as the negative electrode, and the positive electrode plate and the shell 10 are insulated and isolated by the insulating sheet 80.

[0047] The housing 10 can be made of stainless steel.

[0048] The aforementioned insulating sheet 80 can be made of non-metallic materials. To further ensure the heat-fusion effect, the insulating sheet 80 can be made of polypropylene (PP plastic).

[0049] The positive electrode 50 is thermally connected to the casing 10 via the insulating sheet 80, which simplifies the battery assembly process. On the other hand, it can also effectively avoid gaps between the positive electrode 50, the insulating sheet 80 and the casing 10, thereby effectively improving the overall sealing performance of the battery.

[0050] Among them, the negative electrode 60 can be made of nickel sheet, and the positive electrode 50 can be made of aluminum.

[0051] Furthermore, such as Figure 7 As shown, the housing 10 is provided with a mounting hole 102, and the positive electrode 50 includes a column portion 501. The column portion 501 passes through the insulating sheet 80 and extends into the mounting hole 102 to facilitate electrical connection with the positive electrode of the battery cell 100.

[0052] In some embodiments, the explosion-proof housing assembly further includes a liquid-blocking plug 70, and the housing 10 is provided with a liquid injection hole 103 to facilitate the injection of electrolyte into the housing 10. The liquid-blocking plug 70 is welded to the housing 10 and seals the liquid injection hole 103.

[0053] Furthermore, the plug 70 is connected to the housing 10 via a gasket 90; both the plug 70 and the gasket 90 can be made of steel.

[0054] In some implementations, the cover plate 20 is made of stainless steel.

[0055] In some embodiments, the sealant 40 is made of polypropylene (PP plastic).

[0056] This embodiment also discloses a battery, including the aforementioned explosion-proof housing assembly, such as... Figure 4 and Figure 7 As shown, a battery cell 100 is disposed inside the housing 10.

[0057] In this battery cell 100, the positive electrode is electrically connected to the positive electrode component 50, and the negative electrode is electrically connected to the negative electrode component 60.

[0058] Furthermore, the aforementioned battery cell 100 is rectangular, which is more conducive to heat dissipation and has a higher energy density.

[0059] The battery in the above embodiment uses a sealant to form a pressure relief port to achieve pressure relief. The structure is simple and the manufacturing process is simplified. While effectively ensuring the reliability of pressure relief, it also makes the processing of the pressure relief structure more convenient, greatly reducing the processing cost and improving the safety of battery use.

[0060] Example 2

[0061] The main difference between this embodiment and Embodiment 1 is that each weld mark 30 has at least two notches 301 (not shown in the figure), and each notch 301 is sealed by a sealing compound 40 to achieve multi-point pressure relief.

[0062] The above structure can form a pressure relief port at the sealing colloid 40 of multiple notches 301 when the internal pressure of the housing 10 reaches the first pressure, which is more conducive to improving the pressure relief speed.

[0063] In some embodiments, at least two notches 301 in each weld mark 30 have different orientations. For example, when the housing 10 is rectangular and the weld mark 30 is rectangular frame-shaped, one notch 301 is located on one side of the left side of the rectangular weld mark 30, and the other notch 301 is located on the other side of the front side. That is, notches 301 can be provided in different orientations of the weld mark 30 to form multiple pressure relief ports in different orientations, realize multi-directional pressure relief, and improve the pressure relief speed and pressure relief balance.

[0064] All the above-mentioned optional technical solutions can be combined in any way to form optional embodiments of this utility model. That is, any number of embodiments can be combined to meet the needs of different application scenarios. All of these are within the protection scope of this application and will not be described in detail here.

[0065] It should be noted that the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An explosion-proof housing assembly, characterized in that: include, A housing, the interior of which is used to house the battery cell, the housing having at least one open end; Cover plate, the cover plate closing the opening end; The cover plate and the housing are welded together by a weld mark, which has a notch. The notch is sealed by a sealant, which is configured to rupture and form a pressure relief port when the internal pressure of the housing reaches a first pressure.

2. The explosion-proof housing assembly according to claim 1, characterized in that: The housing has openings at both ends, and each opening is closed by a corresponding cover plate.

3. The explosion-proof housing assembly according to claim 1, characterized in that: The shell is rectangular, and the weld mark portion is rectangular and has the notch.

4. The explosion-proof housing assembly according to claim 1, characterized in that: The weld mark has at least two notches, each of which is sealed by the sealant.

5. The explosion-proof housing assembly according to claim 4, characterized in that: At least two of the notches in each weld area are oriented differently.

6. The explosion-proof housing assembly according to claim 1, characterized in that, It also includes a positive electrode and a negative electrode. The housing is a conductive element. The positive electrode is thermally fused to the housing through an insulating sheet, and the negative electrode is welded to the outer wall of the housing.

7. The explosion-proof housing assembly according to claim 6, characterized in that, The housing is provided with a mounting hole, and the positive electrode includes a cylindrical part that extends through the insulating sheet into the mounting hole.

8. The explosion-proof housing assembly according to claim 1, characterized in that: It also includes a liquid-blocking plug, wherein the housing is provided with a liquid injection hole, and the liquid-blocking plug is connected to the housing and blocks the liquid injection hole.

9. A battery, characterized in that: The explosion-proof housing assembly as described in any one of claims 1-8 is provided with a battery cell inside the housing.

10. The battery according to claim 9, characterized in that: The battery cell is rectangular.

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