Box body and cell explosion-proof valve combined structure and battery pack

Abstract

The utility model relates to the technical field of energy storage systems, in particular to a box body and cell explosion-proof valve combined structure and a battery pack, the box body and cell explosion-proof valve combined structure comprises a box body, a cover plate, a cell and a cell outer explosion-proof valve, the cover plate covers the box body, and the cell outer explosion-proof valve is arranged on the cover plate. According to the utility model, the structure of the upper box body is optimally designed, the explosion-proof valve is fixedly arranged at the top of the box body, the lower surface of the explosion-proof valve is over against the explosion-proof valve in the battery cell, and the battery cell is directly discharged to the top from the box body after the valve is opened, so that combustible gas is quickly and effectively discharged, and the flammable and combustible gas is prevented from being accumulated to cause deflagration; the safety risk is reduced. The explosion-proof valve can solve the technical problem that combustible gas at the top of the battery box still cannot be discharged after the explosion-proof valve is opened.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and in particular to a combination structure of a housing and a cell explosion-proof valve and a battery pack. Background Technology

[0002] Explosion-proof valves play a crucial role in battery packs. When flammable gases are generated inside the battery due to overcharging, overheating, or short circuits, the explosion-proof valve automatically opens when the pressure reaches a preset threshold, rapidly releasing the gas and preventing the battery pack from rupturing or exploding due to pressure buildup. In the early stages of thermal runaway, timely pressure relief by the explosion-proof valve can slow down the vicious cycle of internal temperature and pressure, reducing the risk of heat spread between battery cells.

[0003] Currently, the explosion-proof valve in battery pack solutions is usually located on the side of the battery casing, which is sufficient for normal internal pressure balance. However, when a cell experiences thermal runaway, flammable gases typically accumulate at the top of the battery casing and gradually spread to the bottom. While the explosion-proof valve can release some of these gases when it opens, some hydrogen, carbon monoxide, and other flammable gases remain at the top of the casing, potentially causing a deflagration and further increasing the risk of explosion. Utility Model Content

[0004] The purpose of this utility model is to provide a combination structure of the enclosure and the cell explosion-proof valve, as well as a battery pack, which can solve the technical problem that combustible gas at the top of the battery enclosure cannot be discharged after the explosion-proof valve is opened.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model designs a combination structure of a housing and a battery cell explosion-proof valve, and a battery pack, including a housing, a cover plate, a battery cell, and an external explosion-proof valve for the battery cell. The housing has a hollow internal structure and an opening at the top. The battery cell is placed inside the housing with its upper end facing the opening. The cover plate covers the top of the housing, and the external explosion-proof valve for the battery cell is placed on the cover plate.

[0007] As a preferred embodiment, the cover plate is provided with a horizontal groove, and the external explosion-proof valve of the battery cell is disposed in the horizontal groove.

[0008] As a preferred embodiment, the combined structure of the housing and the cell explosion-proof valve further includes an internal cell explosion-proof valve, which is located at the upper end of the cell and below the external cell explosion-proof valve.

[0009] Furthermore, the combined structure of the housing and the cell explosion-proof valve also includes an explosion-proof valve protective film, which is disposed on the upper end of the cell's external explosion-proof valve.

[0010] As a preferred embodiment, the combination structure of the enclosure and the cell explosion-proof valve also includes a sealing ring, which is disposed between the upper end of the enclosure and the cover plate.

[0011] This utility model also designs a battery pack, including the above-mentioned housing and cell explosion-proof valve combination structure, and a battery module, wherein the battery module is disposed inside the combination structure.

[0012] The beneficial effects of this utility model are:

[0013] This invention provides a combined structure of a housing and a battery cell explosion-proof valve, as well as a battery pack. Through optimized design of the upper housing structure, the explosion-proof valve is fixedly installed on the top of the housing, with its lower part directly aligned with the explosion-proof valve inside the battery cell. After the battery cell's valve is opened, the gas is directly discharged to the top of the housing, allowing for rapid and effective discharge of flammable gas. This prevents the accumulation of flammable and explosive gases, thus avoiding deflagration and reducing safety risks. This invention solves the technical problem that flammable gas cannot be discharged from the top of the battery housing even after the explosion-proof valve is opened. Attached Figure Description

[0014] Figure 1 This is an exploded view of the present invention.

[0015] Figure 2 This is a schematic diagram of the explosion-proof valve and the protective film of the explosion-proof valve on the outside of the battery cell.

[0016] Figure 3 This is a plan view of the cover plate.

[0017] Figure 4 This is a top view of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Housing, 2. Blind rivet, 3. Sealing ring, 4. Cover plate, 5. Explosion-proof valve outside the battery cell, 6. Explosion-proof valve protective film, 7. Horizontal groove, 8. Rectangular hole, 9. Battery cell, 10. Explosion-proof valve inside the battery cell. Detailed Implementation

[0020] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this 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. Specifically, the terms "first position" and "second position" refer to two different positions.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] To address the problems mentioned in the background art, this utility model discloses a combination structure of a housing and a battery cell explosion-proof valve, as well as a battery pack. By optimizing the design of the upper housing structure, the explosion-proof valve is fixedly installed on the top of the housing, with the bottom of the explosion-proof valve directly facing the explosion-proof valve inside the battery cell. After the battery cell opens the valve, it directly discharges to the top of the housing, allowing flammable gas to be discharged quickly and effectively, avoiding the accumulation of flammable and explosive gases, thereby preventing deflagration and reducing safety risks.

[0024] This utility model provides a combined structure of a housing and a battery cell explosion-proof valve, and a battery pack, including a housing 1, a sealing ring 3, a cover plate 4, a battery cell 9, an external explosion-proof valve 5, an explosion-proof valve protective film 6, and an internal explosion-proof valve 10. The housing 1 has a hollow structure with an opening at its upper end. The battery cell is placed inside the housing 1 with its upper end facing the opening. The cover plate 4 covers the housing 1, and the external explosion-proof valve 5 is disposed on the cover plate 4. The cover plate 4 has a horizontal groove 7, and the external explosion-proof valve 5 is disposed in the horizontal groove 7. The internal explosion-proof valve 10 is disposed at the upper end of the battery cell and below the external explosion-proof valve 5. The explosion-proof valve protective film 6 is disposed at the upper end of the external explosion-proof valve 5. The sealing ring 3 is disposed between the upper end of the housing 1 and the cover plate 4.

[0025] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 , 4As shown, the combined structure of the enclosure and the battery cell explosion-proof valve mainly consists of enclosure 1, cover plate 4, sealing ring 3, battery cell external explosion-proof valve 5, explosion-proof valve protective film 6, and core-pulling rivets 2.

[0027] Two rectangular holes are designed on the top of the housing 1. A cover plate 4 is installed above the rectangular holes, and a battery module is installed inside the rectangular holes. An annular sealing ring 3 is installed between the cover plate 4 and the housing 1. The cover plate 4 is fixed to the housing 1 by a pop rivet 2 to ensure that the housing 1 can achieve an IP67 rating. Two rectangular holes 8 are made on the top of the housing 1. A battery module is installed inside the rectangular holes 8. The rectangular holes 8 are designed with folded edges around their perimeter, and a cover plate 4 is installed on the folded edges. To ensure the IP67 protection rating of the housing, a sealing ring 3 is installed between the folded edges and the cover plate 4. The cover plate 4, the sealing ring 3, and the housing 1 are firmly fixed by a pop rivet 2.

[0028] The battery module is installed inside the rectangular hole 8. The cover plate 4 can be made of aluminum plate, and four horizontal grooves 7 of the same size are machined on the cover plate 4. Figure 3 As shown, the external explosion-proof valve 5 for the battery cell is fixed to the horizontal groove 7 on the upper surface of the cover plate 4 by laser welding to meet airtightness requirements. The lower part of the external explosion-proof valve 5 corresponds precisely to the position of the explosion-proof valve inside the battery cell in the battery module. The horizontal groove 7 is designed to be directly above the explosion-proof valve of the module cell to ensure that flammable gases such as hydrogen and carbon monoxide appearing after the cell valve is opened are promptly discharged outside the PACK package. During processing, transfer, and transportation, to ensure the integrity of the external explosion-proof valve 5, a protective film 6 is specially installed on it. Figure 2 As shown in the diagram. This structural design ensures that after the battery cell opens its valve, the flammable gas emitted is immediately ejected from the explosion-proof valve 5 directly above the battery cell, promptly removing flammable gases such as hydrogen and carbon monoxide and reducing safety risks.

[0029] This utility model also provides a battery pack, including the above-mentioned housing and cell explosion-proof valve combination structure, and a battery module, wherein the battery module is disposed inside the combination structure.

[0030] This invention improves the installation method of the housing 1 and the external explosion-proof valve 5 of the battery cell by eliminating the side-mounted explosion-proof valve and instead installing the external explosion-proof valve 5 of the battery cell on the top of the housing 1, combining the housing 1 and the external explosion-proof valve 5 into one unit. This can completely remove flammable and explosive gases, such as hydrogen and carbon monoxide, from the PACK pack in a timely manner, effectively preventing the accumulation of gases inside the housing and thus reducing the risk of deflagration in the battery pack and the risk of explosion.

[0031] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A combined structure of a housing and a battery cell explosion-proof valve, characterized in that: The device includes a housing (1), a cover plate (4), a battery cell (9), and an external explosion-proof valve (5) for the battery cell. The housing (1) has a hollow structure inside and an opening at the top. The battery cell is placed inside the housing (1) with its upper end facing the opening. The cover plate (4) covers the top of the housing (1), and the external explosion-proof valve (5) for the battery cell is placed on the cover plate (4).

2. The combination structure of the housing and the battery cell explosion-proof valve according to claim 1, characterized in that: The cover plate (4) is provided with a horizontal groove (7), and the external explosion-proof valve (5) of the battery cell is installed in the horizontal groove (7).

3. The combination structure of the housing and the battery cell explosion-proof valve according to claim 1, characterized in that: The combined structure of the housing and the cell explosion-proof valve also includes an internal cell explosion-proof valve (10), which is located at the upper end of the cell and below the external cell explosion-proof valve (5).

4. The combination structure of the housing and the battery cell explosion-proof valve according to claim 3, characterized in that: The combined structure of the housing and the cell explosion-proof valve also includes an explosion-proof valve protective film (6), which is disposed on the upper end of the cell external explosion-proof valve (5).

5. The combination structure of the housing and the battery cell explosion-proof valve according to claim 1, characterized in that: The combined structure of the enclosure and the battery cell explosion-proof valve also includes a sealing ring (3), which is disposed between the upper end of the enclosure (1) and the cover plate (4).

6. A battery pack, characterized in that: The invention includes the enclosure and cell explosion-proof valve combination structure as described in any one of claims 1 to 5, and a battery module disposed inside the combination structure.

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