Explosion-proof structure of lithium ion battery

Abstract

The utility model discloses a lithium battery anti-explosion structure and belongs to the technical field of battery anti-explosion. The interior of the anti-explosion valve body is fixedly connected with the pressure relief area. A concave second nick is formed in the connecting area of the pressure relief area and the anti-explosion valve body; a first nick is formed in the upper surface of the pressure relief area, the two ends of the first nick communicate with the second nick, and the outer side of the anti-explosion valve body is fixedly connected with the welding edge; and a plurality of reinforcing ribs are fixed between the lower surfaces of the two straight line parts of the welding edge and the side surfaces of the corresponding straight line parts of the anti-explosion valve body. Limiting strips are fixed between the lower surfaces of the two arc-shaped parts of the welding edge and the side faces of the corresponding arc-shaped parts of the anti-explosion valve body. According to the explosion-proof valve, the welding edge is sleeved outside the explosion-proof valve body and is matched with the reinforcing rib and the limiting strip for use, so that the explosion-proof valve body and the lithium ion battery cover plate are welded and connected more firmly and stably, the welding precision is improved, the explosion-proof valve can be ensured to play a role reliably, and safety accidents such as battery explosion are effectively prevented.

Description

Technical Field

[0001] The utility model relates to a lithium ion battery explosion-proof structure, belonging to the technical field of battery explosion-proof. Background Art

[0002] Lithium-ion batteries mainly use notches, welded explosion-proof membranes and other methods as explosion-proof devices. When the battery heats up, the gas inside the battery expands and the pressure increases to a certain level, the notches or explosion-proof membrane will become unsoldered or rupture, releasing gas and pressure, thereby preventing the battery from exploding.

[0003] The Chinese invention patent application number 202410167182.5, filed on February 6, 2024, and titled “Explosion-proof Valve and Battery,” has the following problems:

[0004] The explosion-proof valve is directly welded to the battery cover, which makes it difficult to ensure the precise positioning between the explosion-proof valve body and the battery cover, and there are deficiencies in welding accuracy and stability. At the same time, the strength of the edge of the explosion-proof valve is insufficient. When the battery cell experiences vibration, it is easy to crack and deform or break and fall off under the impact of high-pressure gas, which in turn causes the battery cell to leak. Utility Model Content

[0005] In order to solve the problems existing in the background technology, the utility model provides a lithium ion battery explosion-proof structure.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a lithium-ion battery explosion-proof structure, comprising an explosion-proof valve body, a welding edge, a pressure relief zone and reinforcing ribs; the explosion-proof valve body is a waist-shaped structure, and the interior of the explosion-proof valve body is fixedly connected to the pressure relief zone; a recessed second notch is provided in the connection area between the pressure relief zone and the explosion-proof valve body; an arc-shaped first notch is provided on the upper surface of the pressure relief zone, and both ends of the first notch are connected to the second notch, and the circumferential edge of the outer ring of the explosion-proof valve body is fixedly connected to the welding edge; a plurality of reinforcing ribs are fixed between the lower surface of the two straight portions of the welding edge and the side surfaces of the corresponding straight portions of the explosion-proof valve body.

[0007] There are two first notches, which are symmetrically arranged and both communicate with the second notch.

[0008] The two first notches are arranged to intersect and communicate with each other.

[0009] The depths of the two first notches are both greater than the depth of the second notch.

[0010] A gap is reserved between the outer side surface of the reinforcing rib and the outer side surface of the welding edge.

[0011] A limiting strip is fixed between the lower surfaces of the two arc-shaped portions of the welding edge and the side surfaces of the corresponding arc-shaped portions of the explosion-proof valve body.

[0012] The material of the limiting strip is elastic rubber.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model realizes a stronger and more stable welding connection between the explosion-proof valve body and the lithium-ion battery cover by fitting a welding edge on the outside of the explosion-proof valve body and cooperating with reinforcing ribs and limit strips, thereby improving the welding accuracy and ensuring that the explosion-proof valve can function reliably when the internal pressure of the battery rises abnormally, thereby effectively preventing the occurrence of safety accidents such as battery explosion.

[0015] 2. This new design utilizes reinforcing ribs for positioning, and after fitting, the stop bar engages the groove to achieve initial positioning, simplifying the installation process and enhancing the strength of the explosion-proof valve edge. Under the impact of high-pressure gas, the explosion-proof valve maintains structural integrity and is less susceptible to deformation or rupture, effectively controlling the pressure relief range and ensuring that the internal pressure of the battery fluctuates within a safe range.

[0016] 3. This utility model achieves sensitive gas release and pressure relief of the battery's internal gas through the coordinated use of the pressure relief area and notches. This enables the explosion-proof valve to quickly respond to changes in the battery's internal pressure and promptly release excess gas, thereby reducing the battery's internal pressure and improving explosion-proof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 yes Figure 1 Bottom view of

[0019] Figure 3 yes Figure 1 The main view;

[0020] Figure 4 yes Figure 3 A top view of

[0021] Figure 5 yes Figure 3 Bottom view of . DETAILED DESCRIPTION

[0022] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] A lithium-ion battery explosion-proof structure includes an explosion-proof valve body 1, a welding edge 2, a pressure relief area 3, and a reinforcing rib 6; the explosion-proof valve body 1 is a waist-shaped structure, and the interior of the explosion-proof valve body 1 is fixedly connected to the pressure relief area 3; the connection area between the pressure relief area 3 and the explosion-proof valve body 1 is provided with a concave second notch 5; the upper surface of the pressure relief area 3 is provided with an arc-shaped first notch 4, which is easy to break after impact, and both ends of the first notch 4 are connected to the second notch 5, so that the impact force required for rupture deflection is smaller and more sensitive, ensuring the explosion-proof structure of the lithium-ion battery The explosion-proof performance of the structure; the circumferential edge of the outer ring of the explosion-proof valve body 1 is fixedly connected to the welding edge 2; the welding edge 2 matches the lithium-ion battery cover, the explosion-proof valve body 1 and the welding edge 2 are assembled and connected to the cover of the lithium-ion battery, and a plurality of uniformly distributed reinforcing ribs 6 are fixed between the lower surfaces of the two straight portions of the welding edge 2 and the side surfaces of the corresponding straight portions of the explosion-proof valve body 1. The explosion-proof valve body 1 and the welding edge 2 are positioned by the reinforcing ribs 6, which are used to enhance the strength at the edge of the welding edge 2 and control the pressure relief range to the inner side of the explosion-proof valve body 1.

[0024] There are two first notches 4 , which are symmetrically arranged and both communicate with the second notch 5 , forming an opening on the pressure relief area 3 for relieving air pressure.

[0025] The two first notches 4 are arranged to intersect and communicate with each other, which facilitates the formation of an opening.

[0026] The depths of the two first notches 4 are both greater than the depth of the second notch 5 , which facilitates the breaking of the first notches 4 , and provides conditions for the deflection of the pressure relief zone 3 after the first notch 4 breaks through the second notch 5 .

[0027] A gap is reserved between the outer side surface of the reinforcing rib 6 and the outer side surface of the welding edge 2. The gap is a reserved welding position to facilitate welding work.

[0028] A limiting strip 7 is fixed between the lower surface of the two arc-shaped portions of the welding edge 2 and the side surface of the corresponding arc-shaped portion of the explosion-proof valve body 1 , and the limiting strip 7 is used to preliminarily limit the explosion-proof valve body 1 and the welding edge 2 .

[0029] The material of the limiting strip 7 is elastic rubber, which has a certain deformation ability, so as to facilitate the docking and limiting of the limiting strip 7 and the groove.

[0030] When using the utility model, first preset grooves that match the reinforcing ribs 6 and the limiting strips 7 on the lithium-ion battery cover, and assemble the explosion-proof valve body 1 and the welding edge 2 on the lithium-ion battery cover. During the sleeve connection process, the explosion-proof valve body 1 and the welding edge 2 are positioned by the reinforcing ribs 6. After the sleeve connection is completed, the limiting strips 7 are engaged with the grooves to preliminarily limit the explosion-proof valve body 1 and the welding edge 2, and the welding edge 2 is welded to the lithium-ion battery cover, and the cover is assembled as a whole on the lithium-ion battery.

[0031] When the battery heats up and the gas inside the battery expands, the pressure relief area 3 breaks at the first notch 4 and deflects and opens around the first notch 4 and the second notch 5, thereby releasing gas and pressure inside the lithium-ion battery and realizing the function of the explosion-proof structure of the entire lithium-ion battery.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0033] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lithium-ion battery explosion-proof structure, characterized by: The explosion-proof valve comprises an explosion-proof valve body (1), a welding edge (2), a pressure relief zone (3) and a reinforcing rib (6); the explosion-proof valve body (1) is a waist-shaped structure, and the interior of the explosion-proof valve body (1) is fixedly connected to the pressure relief zone (3); a concave second notch (5) is provided in the connection area between the pressure relief zone (3) and the explosion-proof valve body (1); an arc-shaped first notch (4) is provided on the upper surface of the pressure relief zone (3), and both ends of the first notch (4) are connected to the second notch (5); the outer ring of the explosion-proof valve body (1) has a circumferential edge fixedly connected to the welding edge (2); a plurality of reinforcing ribs (6) are fixed between the lower surface of the two straight portions of the welding edge (2) and the side surface of the corresponding straight portion of the explosion-proof valve body (1).

2. The lithium-ion battery explosion-proof structure according to claim 1, characterized in that: The number of the first notches (4) is two, and the two first notches (4) are symmetrically arranged and both are connected to the second notch (5).

3. The lithium-ion battery explosion-proof structure according to claim 2, characterized in that: The two first notches (4) are arranged to intersect and communicate with each other.

4. The lithium-ion battery explosion-proof structure according to claim 3, characterized in that: The depths of the two first notches (4) are both greater than the depth of the second notch (5).

5. The lithium-ion battery explosion-proof structure according to claim 1, characterized in that: A gap is reserved between the outer side surface of the reinforcing rib (6) and the outer side surface of the welding edge (2).

6. The lithium-ion battery explosion-proof structure according to claim 1, characterized in that: A limiting strip (7) is fixed between the lower surfaces of the two arc-shaped portions of the welding edge (2) and the side surfaces of the corresponding arc-shaped portions of the explosion-proof valve body (1).

7. The lithium-ion battery explosion-proof structure according to claim 6, characterized in that: The material of the limiting strip (7) is elastic rubber.

Images