Explosion-proof valve battery core shell and battery

Abstract

The utility model provides an explosion-proof valve battery core shell and a battery, which belong to the technical field of batteries, and comprise a shell which is arranged in a frame-shaped structure, an explosion-proof valve mounting hole is arranged on the side surface of the shell, a reinforcing part which is integrally arranged with the side surface of the explosion-proof valve mounting hole is arranged along the edge of the explosion-proof valve mounting hole, and the explosion-proof valve mounting hole is arranged in the shell. The inner side surface of the reinforcing part is arranged in a step shape; and the anti-explosion valve is embedded in the anti-explosion valve mounting hole, and the anti-explosion valve is connected with the shell in a welding mode. According to the utility model, the reinforcing part is arranged at the edge of the explosion-proof valve mounting hole, so that the strength of the explosion-proof valve mounting area is improved, the thickness of the side surface on which the explosion-proof valve is positioned does not need to be integrally increased, and the processing difficulty and the material cost of the whole battery cell shell are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries and relates to a battery core shell, in particular to an explosion-proof valve battery core shell and a battery. Background Art

[0002] With the rapid development of lithium-ion battery technology, people have also put forward higher requirements for the safety performance of lithium-ion batteries. The pressure relief mechanism on the lithium-ion battery has a vital impact on the safety performance of the lithium-ion battery. For example, when the lithium-ion battery is short-circuited or overcharged, it may cause thermal runaway inside the lithium-ion battery and cause the internal air pressure to rise sharply. At this time, the pressure relief mechanism needs to be actuated to release the internal air pressure to the outside, thereby preventing the lithium-ion battery from exploding. As a key reliability structural unit, the explosion-proof valve has a vital role in the stability of the shell strength.

[0003] The existing battery explosion-proof valve is installed on the shell of the battery cell, especially the current blade battery. The battery cell is thin, and the explosion-proof valve installation hole is started on the narrow side of the battery cell shell, which will greatly reduce the rigidity of the narrow side of the battery cell shell. When the internal pressure of the battery cell increases, the battery cell will deform slightly. Due to the existence of the installation hole, the deformation resistance of the battery shell at the installation hole is reduced. Therefore, the battery cell shell is prone to tearing at the installation hole, which in turn causes damage to the battery cell shell and the fall-off of the explosion-proof valve, seriously affecting the safety of the battery cell.

[0004] In order to improve the strength of the side where the explosion-proof valve installation hole is located, the thickness of the side where the explosion-proof valve installation hole is located is generally increased. However, such a structural design will increase the difficulty of processing and increase the material cost of the battery cell shell. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the prior art and to propose a battery core shell which can improve the strength of the explosion-proof valve installation hole and avoid the increase of processing difficulty and material cost.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an explosion-proof valve battery core shell, comprising:

[0007] A shell, and an explosion-proof valve mounting hole is arranged on the side of the shell, wherein a reinforcement portion is arranged along the edge of the explosion-proof valve mounting hole and is integrally arranged with the side where the explosion-proof valve mounting hole is located, and the inner surface of the reinforcement portion is arranged in a stepped shape;

[0008] The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

[0009] In the above-mentioned explosion-proof valve battery core shell, the reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for supporting the explosion-proof valve, and a reinforcement boss is arranged between the first reinforcement platform and the second reinforcement platform, wherein the thickness of the first reinforcement platform is greater than the thickness of the second reinforcement platform.

[0010] In the above-mentioned explosion-proof valve battery core shell, the first reinforcement platform, the second reinforcement platform and the reinforcement boss are integrally arranged, or the first reinforcement platform, the second reinforcement platform, the reinforcement boss and the shell are integrally arranged.

[0011] In the above-mentioned explosion-proof valve battery core shell, the inner and outer side surfaces of the first reinforcement platform are respectively the first reinforcement inner plane and the first reinforcement outer plane, and the inner and outer side surfaces of the second reinforcement platform are respectively the second reinforcement inner plane and the second reinforcement outer plane, wherein there is a height difference between the first reinforcement inner plane and the second reinforcement inner plane.

[0012] In the above-mentioned explosion-proof valve battery core shell, a first beaded ring is arranged at the intersection of the reinforcement boss and the first reinforcement platform, and the first beaded ring is located on the first reinforcement outer side plane.

[0013] In the above-mentioned explosion-proof valve battery core shell, the inner and outer side surfaces of the reinforced boss are respectively the boss inner plane and the boss outer plane, and the two sides of the boss outer plane are respectively connected to the first reinforced outer plane and the second reinforced outer plane through the first boss connecting plane and the second boss connecting plane, wherein the intersection of the boss outer plane and the first boss connecting plane, and the intersection of the boss outer plane and the second boss connecting plane are both provided with chamfered corners R.

[0014] In the above-mentioned explosion-proof valve battery core shell, the intersection of the first reinforcement platform and the second reinforcement platform is concave to form a second rib ring.

[0015] In the above-mentioned explosion-proof valve battery core shell, the thickness H1 of the first reinforcement platform is between 0.2 mm and 0.8 mm, and the thickness H2 of the reinforcement boss is between 0.3 mm and 0.7 mm.

[0016] In the above-mentioned explosion-proof valve battery core shell, the depth of the first rib ring is H3, and the reinforcing boss is arranged in a U-shaped structure, wherein the minimum width W1 between the side of the second rib ring close to the second reinforcing platform and the connecting plane of the second boss is not less than the difference between H1 and H3.

[0017] The utility model also provides a battery, comprising the explosion-proof valve battery core shell.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1) The utility model provides an explosion-proof valve battery core shell, which improves the strength of the explosion-proof valve installation area by arranging a reinforcement portion at the edge of the explosion-proof valve installation hole without increasing the thickness of the side where the explosion-proof valve is located, thereby reducing the processing difficulty and material cost of the entire battery core shell.

[0020] (2) The first reinforced inner plane and the second reinforced inner plane are arranged to have a height difference in order to prevent scratches during the assembly of the internal battery cells, thereby improving the safety of the battery cell assembly.

[0021] (3) By arranging a first rib ring on the first reinforcement outer plane, the reinforcing boss is prevented from affecting the flatness of the first reinforcement outer plane during extrusion molding, thereby improving the processing accuracy of the entire reinforcement portion.

[0022] (4) By providing a second rib ring, the flatness of the outer surface of the boss is ensured during the extrusion molding of the reinforcement boss, and the angle of the chamfer is reduced as much as possible, thereby improving the welding quality between the explosion-proof valve and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a schematic structural diagram of an explosion-proof valve in an explosion-proof valve battery core shell in which an explosion-proof valve is placed upright.

[0024] Figure 2 yes Figure 1 A cross-sectional view of AA is shown.

[0025] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0026] Figure 4 The utility model is a schematic structural diagram of an explosion-proof valve in an explosion-proof valve battery core shell with an inverted explosion-proof valve.

[0027] Figure 5 yes Figure 4 A cross-sectional view of BB is shown.

[0028] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0029] Figure 7 It is a cross-sectional view of a reinforcement portion in a preferred embodiment of the utility model.

[0030] In the figure, 10, shell; 11, explosion-proof valve mounting hole; 20, reinforcement part; 21, first reinforcement platform; 211, first reinforcement outer plane; 212, first reinforcement inner plane; 213, first rib ring; 22, second reinforcement platform; 221, second reinforcement outer plane; 222, second reinforcement inner plane; 23, reinforcement boss; 231, boss outer plane; 232, boss inner plane; 233, first boss connecting plane; 234, second boss connecting plane; 235, second rib ring; 30, explosion-proof valve; 31, valve body; 32, skirt. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] like Figures 1 to 7 As shown, the utility model provides an explosion-proof valve battery core shell, comprising:

[0034] A housing 10 is provided in a frame-shaped structure, and an explosion-proof valve mounting hole 11 is provided on the side of the housing 10, wherein a reinforcing portion 20 is provided along the edge of the explosion-proof valve mounting hole 11 and is integrally provided with the side where the explosion-proof valve mounting hole 11 is located, and the inner surface of the reinforcing portion 20 is provided in a stepped shape;

[0035] The explosion-proof valve 30 is embedded in the explosion-proof valve installation hole 11, and the connection between the explosion-proof valve 30 and the housing 10 is completed by welding.

[0036] The utility model provides an explosion-proof valve battery core shell, which improves the strength of the explosion-proof valve 30 installation area by arranging a reinforcement portion 20 at the edge of the explosion-proof valve installation hole 11, without increasing the thickness of the side where the explosion-proof valve 30 is located as a whole, thereby reducing the processing difficulty and material cost of the entire battery core shell.

[0037] Further preferably, the reinforcement part 20 includes a first reinforcement platform 21 connected to the shell 10, and a second reinforcement platform 22 for supporting the explosion-proof valve 30, and a reinforcement boss 23 is arranged between the first reinforcement platform 21 and the second reinforcement platform 22, wherein the first reinforcement platform 21, the second reinforcement platform 22 and the reinforcement boss 23 are integrally arranged, and the thickness of the first reinforcement platform 21 is greater than the thickness of the second reinforcement platform 22.

[0038] Preferably, the inner and outer side surfaces of the first reinforcement platform 21 are respectively the first reinforcement outer plane 211 and the first reinforcement inner plane 212, and the inner and outer side surfaces of the second reinforcement platform 22 are respectively the second reinforcement outer plane 221 and the second reinforcement inner plane 222, and the first reinforcement outer plane 211 and the second reinforcement outer plane 221 are on the same horizontal plane, and there is a height difference between the first reinforcement inner plane 212 and the second reinforcement inner plane 222.

[0039] In this embodiment, the first reinforced inner plane 212 and the second reinforced inner plane 222 are arranged to have a height difference in order to prevent scratches when assembling the internal battery cells, thereby improving the safety of the battery cell assembly.

[0040] Preferably, a first beading ring 213 is provided at the intersection of the reinforcing boss 23 and the first reinforcing platform 21 , and the first beading ring 213 is located on the first reinforcing outer plane 211 .

[0041] In this embodiment, by providing the first embossing ring 213 on the first reinforced outer plane 211 , the reinforcing boss 23 is prevented from affecting the flatness of the first reinforced outer plane 211 during extrusion molding, thereby improving the processing accuracy of the entire reinforcement portion 20 .

[0042] It is worth mentioning that the first rib ring 213 is arranged in the form of an annular groove.

[0043] Preferably, the inner and outer side surfaces of the reinforcing boss 23 are respectively a boss outer plane 231 and a boss inner plane 232, and the two sides of the boss outer plane 231 are respectively connected to the first reinforcing outer plane 211 and the second reinforcing outer plane 221 through the first boss connecting plane 233 and the second boss connecting plane 234, wherein the intersection of the boss outer plane 231 and the first boss connecting plane 233, and the intersection of the boss outer plane 231 and the second boss connecting plane 234 are both provided with chamfers R.

[0044] Preferably, a second ribbed ring 235 is formed inwardly at the intersection of the first reinforcing platform 21 and the second reinforcing platform 22 .

[0045] In this embodiment, the second rib ring 235 is provided to ensure the flatness of the outer surface 231 of the reinforcing boss 23 during extrusion molding, while reducing the fillet angle as much as possible, thereby improving the welding quality between the explosion-proof valve 30 and the housing 10.

[0046] Preferably, the explosion-proof valve 30 includes a valve body 31 and a skirt 32 extending outwardly along the edge of the valve body 31, and the skirt 32 is connected to the second reinforcement platform 22, wherein the valve body 31 is convex or concave.

[0047] Further preferably, the surface of the explosion-proof valve 30 is provided with notches.

[0048] Preferably, the thickness H1 of the first reinforcing platform 21 is 0.2 mm-0.8 mm, preferably 0.4 mm-0.6 mm, so as to save material.

[0049] Preferably, the thickness H2 of the reinforcing boss 23 is between 0.3 mm and 0.7 mm, preferably between 0.5 mm and 0.6 mm, and the thickness of H2 is not less than the thickness of H1, so as to avoid breakdown during welding.

[0050] Preferably, the depth of the first rib ring 213 is H3, and the reinforcing boss 23 is arranged in a U-shaped structure, wherein the minimum width W1 between the side of the second rib ring 235 close to the second reinforcing platform 22 and the second boss connecting plane 234 is not less than the difference between H1 and H3, so as to avoid the product being damaged by welding stress during welding and improve the reliability of the product.

[0051] It should be noted that in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0052] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An explosion-proof valve battery core shell, characterized in that: include: A shell, and an explosion-proof valve mounting hole is arranged on the side of the shell, wherein a reinforcement portion is arranged along the edge of the explosion-proof valve mounting hole and is integrally arranged with the side where the explosion-proof valve mounting hole is located, and the inner surface of the reinforcement portion is arranged in a stepped shape; The explosion-proof valve is embedded in the installation hole of the explosion-proof valve, and the connection between the explosion-proof valve and the shell is completed by welding; The reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for carrying the explosion-proof valve, and a reinforcement boss is arranged between the first reinforcement platform and the second reinforcement platform, wherein the thickness of the first reinforcement platform is greater than the thickness of the second reinforcement platform.

2. The explosion-proof valve battery core shell according to claim 1, characterized in that: The first reinforcing platform, the second reinforcing platform and the reinforcing boss are integrally arranged, or the first reinforcing platform, the second reinforcing platform, the reinforcing boss and the shell are integrally arranged.

3. The explosion-proof valve battery core shell according to claim 1, characterized in that: The inner and outer side surfaces of the first reinforcement platform are respectively the first reinforcement inner plane and the first reinforcement outer plane, and the inner and outer side surfaces of the second reinforcement platform are respectively the second reinforcement inner plane and the second reinforcement outer plane, wherein there is a height difference between the first reinforcement inner plane and the second reinforcement inner plane.

4. The explosion-proof valve battery core shell according to claim 3, characterized in that: A first beading ring is arranged at the intersection of the reinforcing boss and the first reinforcing platform, and the first beading ring is located on the first reinforcing outer side plane.

5. The explosion-proof valve battery core shell according to claim 3, characterized in that: The inner and outer side surfaces of the reinforcing boss are respectively the boss inner plane and the boss outer plane, and the two sides of the boss outer plane are respectively connected to the first reinforcing outer plane and the second reinforcing outer plane through the first boss connecting plane and the second boss connecting plane, wherein the intersection line of the boss outer plane and the first boss connecting plane, and the intersection line of the boss outer plane and the second boss connecting plane are both provided with chamfered corners R.

6. The explosion-proof valve battery core shell according to claim 5, characterized in that: The intersection of the first reinforcement platform and the second reinforcement platform is concave to form a second ribbed ring.

7. The explosion-proof valve battery core shell according to claim 4, characterized in that: The thickness H1 of the first reinforcing platform is between 0.2 mm and 0.8 mm, and the thickness H2 of the reinforcing boss is between 0.3 mm and 0.7 mm.

8. The explosion-proof valve battery core shell according to claim 6, characterized in that: The depth of the first embossing ring is H3, and the reinforcing boss is arranged in a U-shaped structure, wherein the minimum width W1 between the side of the second embossing ring close to the second reinforcing platform and the connecting plane of the second boss is not less than the difference between H1 and H3.

9. A battery, characterized in that: An explosion-proof valve battery core shell comprising any one of claims 1 to 8.

Images