A stable explosion-proof battery shell

Abstract

The utility model discloses a stable type explosion -proof battery case, this battery case includes shell, pressure -relief piece, welding groove, the shell is hollow topless cylinder structure, pressure -relief piece, welding groove is provided with a plurality of, and both are through the stamping forming on the bottom end face of shell, pressure -relief piece, welding groove whole all recess towards the inside of shell, wherein, pressure -relief piece, welding groove staggered distribution on the bottom end face of shell with equal angle, through the design of the utility model, in the shell bottom end face circumferential uniform arrangement multiple pressure -relief piece, form three -dimensional pressure -relief network, compared with traditional single point formula layout, this design through increasing the number of pressure -relief passage, when the battery inside abnormal gas production can release from multiple directions synchronously, effectively shorten the gas diffusion path, ensure that each area pressure gradient is balanced, simultaneously, equal angle distribution structure makes the shell form symmetrical stress system when bearing internal pressure, avoided local stress concentration phenomenon.

Description

Technical Field

[0001] This utility model belongs to the field of explosion-proof battery technology, specifically relating to a stable explosion-proof battery casing. Background Technology

[0002] Explosion-proof battery casings are key components developed in response to the increasing demands for battery safety. During battery operation, factors such as internal short circuits, overcharging, overheating, or external mechanical impacts can cause electrolyte leakage, gas expansion, or even explosion, seriously threatening personnel lives and equipment safety. Explosion-proof casings, through the use of high-strength flame-retardant materials, optimized structural strength design, and the addition of pressure relief and explosion-proof valves, can quickly release internal pressure and block the flame propagation path in the event of battery thermal runaway, thereby preventing chain explosion accidents.

[0003] Currently, mainstream explosion-proof battery casings on the market primarily rely on built-in pressure relief plates as the core pressure relief element to achieve safety protection. However, existing technical solutions generally adopt a single-point pressure relief plate layout design, that is, a single pressure relief channel is set only in a local area of ​​the casing. This structure has obvious limitations in dealing with abnormal gas generation inside the battery: on the one hand, single-point pressure relief is difficult to achieve uniform pressure distribution. When the local gas pressure rises suddenly, the single-point pressure relief plate may experience excessive stress in the local area of ​​the casing due to response lag or opening pressure deviation, thus affecting the overall structural integrity; on the other hand, due to the fixed position of the pressure relief channel, the gas release path is long in the internal areas of the battery far from the pressure relief point, making it difficult to ensure synchronous and balanced pressure release in all parts, which may lead to the risk of local deflagration, especially under extreme conditions. The above defects directly restrict the reliability and response speed of the explosion-proof casing, becoming a key technical bottleneck in improving the intrinsic safety of the battery system. At the same time, the overall strength of the casing is low, and it is prone to deformation under pressure. Utility Model Content

[0004] The purpose of this invention is to provide a stable explosion-proof battery casing to solve the problems of insufficient explosion-proof stability and low strength of existing battery casings mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a stable explosion-proof battery housing, which includes an outer shell, a pressure relief plate, and a welding groove;

[0006] The outer shell is a hollow, open-top cylindrical structure;

[0007] Multiple pressure relief plates and welding grooves are provided, and both are formed by stamping on the bottom surface of the outer shell; the pressure relief plates and welding grooves are all recessed towards the interior of the outer shell;

[0008] The pressure relief plates and welding grooves are distributed at equal angles on the bottom surface of the outer casing.

[0009] A pressure ring groove is formed between the periphery of the pressure relief sheet and the bottom end face of the housing. When the internal pressure of the housing is excessively high, the pressure ring groove will be squeezed and fractured by the pressure, so that the pressure relief sheet is separated from the bottom end of the housing, thereby releasing the internal pressure of the housing to achieve the purpose of pressure relief and explosion protection.

[0010] Preferably, a reinforcing protrusion is formed on the inner bottom end face of the housing, and the height difference between the reinforcing protrusion and the inner end face of the housing is 0.3mm to 0.7mm.

[0011] Preferably, the cross section of the reinforcing protrusion is in a herringbone shape, and the vertical projection of the welding groove falls on the reinforcing protrusion.

[0012] Preferably, the height difference between the raised end face of the pressure relief sheet and the reinforcing protrusion is 0.1mm to 0.4mm.

[0013] Preferably, the pressure relief sheets are distributed in each corner of the reinforcing protrusion, and the pressure relief sheets and the reinforcing protrusion are not in contact with each other.

[0014] Preferably, a connecting component is formed at the top open end of the housing, and the connecting component includes a deformable portion inclined toward the inside of the housing, and a pressing portion bent toward the outside of the housing at the top of the deformable portion, and a placement area is formed between the deformable portion and the top end face of the housing.

[0015] Preferably, a cover sheet is further disposed on the top of the housing, the cover sheet is placed in the placement area. During assembly, the cover sheet is placed into the placement area, and then the pressing portion is pressed by external stamping. At this time, the pressing portion will drive the deformable portion to deform and bend toward the inner direction of the housing, until the deformable portion limits and fits the top of the cover sheet, so as to realize the assembly of the cover sheet, and the pressing portion and the deformable portion can reach a state with no protrusion on the plane under impact.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] This invention utilizes a design that evenly distributes multiple pressure relief plates around the bottom surface of the casing, forming a three-dimensional pressure relief network. Compared to the traditional single-point layout, this design increases the number of pressure relief channels, allowing for simultaneous release of gas from multiple directions when abnormal gas generation occurs inside the battery. This effectively shortens the gas diffusion path and ensures a balanced pressure gradient across different areas. Simultaneously, the equiangular distribution structure creates a symmetrical stress system when the casing is subjected to internal pressure, preventing localized stress concentration and significantly improving structural stability. This layout reduces pressure relief response time and casing deformation, fundamentally solving the problems of pressure relief lag and localized overload inherent in traditional designs. This provides a more reliable safety guarantee for the battery system. Combined with reinforcing protrusions inside the casing, the strength of the battery casing is further enhanced. The designed connecting components enable rapid assembly of the cover plate later on. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a bottom view of the present invention;

[0020] Figure 3 This is an enlarged schematic diagram of the pressure ring groove location of this utility model;

[0021] Figure 4 This is a cross-sectional view of the outer casing of this utility model;

[0022] Figure 5 This utility model Figure 4 An enlarged schematic diagram of region A in the middle.

[0023] In the picture:

[0024] 100, outer casing; 100a, placement area; 100b, deformable part; 100c, pressing part;

[0025] 101. Pressure relief plate; 101a. Pressure ring groove;

[0026] 102. Welding groove; 103. Reinforcing protrusion;

[0027] 200. Cover plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 5 This utility model provides a technical solution: a stable explosion-proof battery housing, which includes an outer shell 100, a pressure relief plate 101, and a welding groove 102;

[0030] The outer shell 100 is a hollow, open-top cylindrical structure;

[0031] Multiple pressure relief plates 101 and welding grooves 102 are provided, and both are formed by stamping on the bottom surface of the outer shell 100; the pressure relief plates 101 and welding grooves 102 are recessed towards the inside of the outer shell 100.

[0032] Among them, the pressure relief plate 101 and the welding groove 102 are distributed at equal angles on the bottom end surface of the outer shell 100;

[0033] A pressure ring groove 101a is formed between the periphery of the pressure relief plate 101 and the bottom surface of the outer shell 100. When the internal pressure of the outer shell 100 is too high, the pressure ring groove 101a will be squeezed and broken by the pressure, thereby separating the pressure relief plate 101 from the bottom of the outer shell 100, thereby releasing the internal pressure of the outer shell 100 and achieving the purpose of pressure relief and explosion prevention.

[0034] In this embodiment, preferably, a reinforcing protrusion 103 is formed on the inner bottom surface of the outer casing 100, and the height difference between the reinforcing protrusion 103 and the inner end surface of the outer casing 100 is 0.3mm to 0.7mm.

[0035] In this embodiment, preferably, the cross-section of the reinforcing protrusion 103 is "human" shaped, and the vertical projection of the welding groove 102 falls on the reinforcing protrusion 103.

[0036] In this embodiment, preferably, the height difference between the raised end face of the pressure relief plate 101 and the reinforcing protrusion 103 is 0.1mm to 0.4mm.

[0037] In this embodiment, preferably, the pressure relief plates 101 are distributed in each corner of the reinforcing protrusion 103, and the pressure relief plates 101 and the reinforcing protrusion 103 do not contact each other.

[0038] In this embodiment, preferably, a connecting member is formed at the top opening end of the outer casing 100. The connecting member includes a deformable portion 100b that is inclined toward the inside of the outer casing 100, and a pressing portion 100c that is bent toward the outside of the outer casing 100 at the top of the deformable portion 100b. A placement area 100a is formed between the deformable portion 100b and the top surface of the outer casing 100.

[0039] In this embodiment, preferably, the top of the outer shell 100 is also provided with a cover plate 200. The cover plate 200 is placed in the placement area 100a. During assembly, the cover plate 200 is placed in the placement area 100a, and then the external pressing part 100c is used. At this time, the pressing part 100c will drive the deformation part 100b to deform and bend towards the inside of the outer shell 100 until the deformation part 100b limits and fits the top of the cover plate 200, thereby realizing the assembly of the cover plate 200. Under impact, the pressing part 100c and the deformation part 100b can achieve a flat and non-protruding state.

[0040] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stable explosion-proof battery casing, characterized in that: The battery housing comprises an outer case (100), a pressure relief sheet (101), and a welding groove (102); The outer case (100) is a hollow, topless cylindrical structure; A plurality of the pressure relief sheets (101) and the welding grooves (102) are provided, both of which are formed by stamping on the bottom end face of the outer case (100); the entirety of each of the pressure relief sheet (101) and the welding groove (102) is recessed toward the interior of the outer case (100); Wherein, the pressure relief sheets (101) and the welding grooves (102) are distributed on the bottom end face of the outer case (100) in an equally spaced, interleaved arrangement at equal angles; A press ring groove (101a) is formed between the periphery of the pressure relief sheet (101) and the bottom end face of the outer case (100).

2. The stable explosion-proof battery casing according to claim 1, characterized in that: A reinforcing protrusion (103) is formed on the inner bottom end face of the outer case (100), and the height difference between the reinforcing protrusion (103) and the inner end face of the outer case (100) is 0.3mm to 0.7mm.

3. The stable explosion-proof battery casing according to claim 2, characterized in that: The cross section of the reinforcing protrusion (103) is in a herringbone shape, and the vertical projection of the welding groove (102) falls on the reinforcing protrusion (103).

4. A stable explosion-proof battery casing according to claim 2, characterized in that: The height difference between the raised end face of the pressure relief sheet (101) and the reinforcing protrusion (103) is 0.1mm to 0.4mm.

5. A stable explosion-proof battery casing according to claim 4, characterized in that: The pressure relief sheets (101) are distributed in respective corners of the reinforcing protrusion (103), and the pressure relief sheets (101) and the reinforcing protrusion (103) are not in contact with each other.

6. The stable explosion-proof battery casing according to claim 1, characterized in that: A connecting component is formed at the top open end of the outer case (100), the connecting component comprises a deformable portion (100b) inclined toward the interior of the outer case (100), and a pressing portion (100c) bent toward the exterior of the outer case (100) at the top of the deformable portion (100b), and a placement region (100a) is formed between the deformable portion (100b) and the top end face of the outer case (100).

7. A stable explosion-proof battery casing according to claim 6, characterized in that: A cover sheet (200) is further arranged at the top of the outer case (100), and the cover sheet (200) is placed in the placement region (100a).

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