Explosion-proof cap of battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery pack anti-explosion cover cap which comprises a battery cell shell, a cover cap body is welded to the top of the battery cell shell, a limiting rod is fixedly installed on the top wall of the inner side of the cover cap body, a warning shell is fixedly installed on the inner side of the cover cap body, and the warning shell is fixedly installed on the top wall of the inner side of the cover cap body. The outer side of the limiting rod is slidably connected with a sealing pushing plate which forms sealing with the warning shell, spraying holes communicating with the warning shell are formed in the outer portion of the cap body, a communicating hole located above the sealing pushing plate is formed in the inner side of the warning shell, and the warning shell is filled with warning paint. The top of the sealing push plate is fixedly connected with a welding unit which extends to the top of the cap body and is connected with the cap body, and the welding unit comprises a connecting rod which is fixed to the top of the sealing push plate and extends out of the cap body. The explosion-proof cap of the battery pack has the advantage of being capable of effectively performing pressure relief and prompting on a battery cell with a problem.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and particularly relates to an explosion-proof cap for a battery pack. Background Art

[0002] A battery pack refers to series and parallel connections. For a parallel-connected battery pack, it is required that each battery has the same voltage, and the output voltage is equal to the voltage of one battery. A parallel-connected battery pack can provide a stronger current. For a series-connected battery pack, there are not many requirements. In new energy products, the application of battery packs is relatively large, and the corresponding safety requirements are also higher.

[0003] Existing battery pack cells usually use methods such as heat monitoring for explosion-proof or overheat warning, and do not optimize the explosion-proof performance itself. When a problem occurs in the cell itself, a large amount of heat accumulates inside while gas is also generated, causing the cell to expand itself and easily leading to an explosion. If not dealt with in time, it is likely to cause a major safety accident. Therefore, an explosion-proof cap for a battery pack is proposed to solve the above problems. Summary of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides an explosion-proof cap for a battery pack, which has the advantages of being able to effectively relieve pressure and give a warning to a problematic cell, and solves the problems that existing battery pack cells usually use methods such as heat monitoring for explosion-proof or overheat warning, and do not optimize the explosion-proof performance itself. When a problem occurs in the cell itself, a large amount of heat accumulates inside while gas is also generated, causing the cell to expand itself and easily leading to an explosion. If not dealt with in time, it is likely to cause a major safety accident.

[0006] (2) Technical Solutions

[0007] The technical solution for the utility model to solve the above technical problems is as follows: An explosion-proof cap for a battery pack includes a cell housing, the top of the cell housing is welded with a cap body, a limiting rod is fixedly installed on the inner top wall of the cap body, a warning shell is fixedly installed inside the cap body, on the outside of the limiting rod, a sealing push plate that forms a seal with the warning shell is slidably connected, a spraying hole communicating with the warning shell is opened on the outside of the cap body, a communication hole is opened inside the warning shell above the sealing push plate, warning paint is filled inside the warning shell, and a welding unit extending to the top of the cap body and connected thereto is fixedly connected to the top of the sealing push plate.

[0008] The beneficial effects of the utility model are as follows:

[0009] The explosion-proof cap of the battery pack has the advantages of effectively relieving pressure and giving a warning for the problematic battery cells.

[0010] Based on the above technical solutions, the present utility model can be further improved as follows.

[0011] Furthermore, the welding unit includes a connecting rod fixed to the top of the sealing push plate and extending outside the cap body. The top of the connecting rod is fixedly connected with a welding piece bonded to the cap body, and the bottom of the welding piece is fixedly connected with a U-shaped elastic piece contacting the cap body.

[0012] The beneficial effect of adopting the above further solution is that the setting of the welding unit can enable the current battery cell to stop power supply in time in case of emergency to ensure removing the load of the battery cell.

[0013] Furthermore, the number of the U-shaped elastic pieces is multiple, and the multiple U-shaped elastic pieces are distributed in an annular array between the welding piece and the cap body.

[0014] The beneficial effect of adopting the above further solution is that the setting of the multiple U-shaped elastic pieces 83 provides a better contact effect to ensure better passage of current.

[0015] Furthermore, the connection between the welding piece and the cap body is by bonding with hot melt adhesive.

[0016] The beneficial effect of adopting the above further solution is that this setting enables the welding piece to automatically separate when the temperature exceeds the reasonable working temperature of the battery, preventing heat explosion caused by continuous power supply.

[0017] Furthermore, a welding groove is formed at the top of the welding piece, and the welding groove is cross-shaped.

[0018] The beneficial effect of adopting the above further solution is that the setting of the welding groove facilitates the connection of multiple battery cells to form a battery pack. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] Figure 2 is an enlarged view of part A in the figure of the present utility model;

[0021] Figure 3 is a connection diagram of the welding piece and the U-shaped elastic piece of the present utility model.

[0022] In the figure: 1, battery cell housing; 2, cap body; 3, limiting rod; 4, warning shell; 5, sealing push plate; 6, spraying hole; 7, communication hole; 8, welding unit; 81, connecting rod; 82, welding piece; 83, U-shaped elastic piece. Detailed Embodiment

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] In the embodiment, it is given by Figures 1-3 A battery pack explosion-proof cap, the present utility model includes a battery cell housing 1, a cap body 2 is welded to the top of the battery cell housing 1, a limiting rod 3 is fixedly installed on the inner top wall of the cap body 2, a warning shell 4 is fixedly installed inside the cap body 2, a sealing push plate 5 that forms a seal with the warning shell 4 is slidably connected to the outside of the warning shell 4 and the limiting rod 3, a spraying hole 6 communicating with the warning shell 4 is opened on the outside of the cap body 2, a communication hole 7 located above the sealing push plate 5 is opened inside the warning shell 4, warning paint is filled inside the warning shell 4, and a welding unit 8 extending to the top of the cap body 2 and connected thereto is fixedly connected to the top of the sealing push plate 5.

[0025] Furthermore, the welding unit 8 includes a connecting rod 81 fixed to the top of the sealing push plate 5 and extending to the outside of the cap body 2, a welding piece 82 adhesively connected to the cap body 2 is fixedly connected to the top of the connecting rod 81, and a U-shaped elastic piece 83 contacting the cap body 2 is fixedly connected to the bottom of the welding piece 82.

[0026] Furthermore, the number of the U-shaped elastic pieces 83 is multiple, and the multiple U-shaped elastic pieces 83 are distributed in a circular array between the welding piece 82 and the cap body 2.

[0027] Furthermore, the connection between the welding piece 82 and the cap body 2 is adhesively connected by hot melt adhesive.

[0028] Furthermore, a welding groove is opened on the top of the welding piece 82, and the welding groove is cross-shaped.

[0029] Working principle:

[0030] When a fault occurs in the battery cell, high heat begins to be generated inside it, and the heat is transferred to the welding piece 82 through the sealing push plate 5, thereby melting the hot melt adhesive. At this time, the connection between the welding piece 82 and the cap body 2 is released. At this time, the battery cell can no longer be connected to the welding piece 82 through the U-shaped elastic piece 83, so that its connection with the battery pack is disconnected;

[0031] Meanwhile, the high pressure inside the battery cell can push the sealing push plate 5 to start moving upward. When the sealing push plate 5 moves to the communication hole 7, the high pressure inside it is discharged through the communication hole 7 and the spraying hole 6, and at the same time, the warning paint in its warning shell 4 is sprayed out, so as to achieve pressure relief and identify itself at the same time.

[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack explosion-proof cap, comprising a battery cell housing (1), characterized in that: A cap body (2) is welded to the top of the battery cell housing (1); a limiting rod (3) is fixedly mounted on the inner top wall of the cap body (2); a warning shell (4) is fixedly mounted on the inner side of the cap body (2); a sealing push plate (5) is slidably connected to the outer side of the warning shell (4) and the limiting rod (3) and forms a seal with the warning shell (4); a spray hole (6) connected to the warning shell (4) is provided on the outside of the cap body (2); a connecting hole (7) located above the sealing push plate (5) is provided on the inside of the warning shell (4); the interior of the warning shell (4) is filled with warning paint; and a welding unit (8) extending to and connected to the top of the cap body (2) is fixedly connected to the top of the sealing push plate (5).

2. The explosion-proof cap for a battery pack according to claim 1, characterized in that: The welding unit (8) comprises a connecting rod (81) fixed to the top of the sealing push plate (5) and extending to the outside of the cap body (2); the top of the connecting rod (81) is fixedly connected to a welding sheet (82) bonded to the cap body (2); the bottom of the welding sheet (82) is fixedly connected to a U-shaped elastic sheet (83) in contact with the cap body (2).

3. The explosion-proof cap of a battery pack according to claim 2, characterized in that: There are multiple U-shaped elastic sheets (83), and the multiple U-shaped elastic sheets (83) are distributed in a ring array between the welding sheet (82) and the cap body (2).

4. The explosion-proof cap of a battery pack according to claim 2, characterized in that: The welding sheet (82) and the cap body (2) are connected by bonding with low-temperature hot-melt adhesive.

5. The explosion-proof cap of a battery pack according to claim 2, characterized in that: A welding groove is provided on the top of the welding sheet (82), and the welding groove is in a cross shape.

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