Battery cell shell with stepped anti-explosion valve and battery

Abstract

The utility model provides a battery core shell with a stepped anti-explosion valve and a battery, which belong to the technical field of batteries, and comprise a shell, an anti-explosion valve mounting hole is formed in the side surface of the shell; the explosion-proof valve comprises a valve body, a skirt edge is arranged along the edge of the valve body, a first step part is arranged on the skirt edge, and the skirt edge is in lap joint with the outer plane, where the explosion-proof valve mounting hole is located, of the shell through the first step part; or the inner plane, where the anti-explosion valve mounting hole is located, of the shell is in lap joint with the first step part of the skirt edge, and the first step part and the side face, where the anti-explosion valve mounting hole is located, of the shell are fixed through welding. According to the utility model, the skirt edge of the explosion-proof valve is arranged to be of the step-shaped structure, so that the strength of the joint of the explosion-proof valve and the shell is increased, the thickness of the side surface of the shell 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 a battery core shell with a stepped explosion-proof valve 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 utility model aims to solve the above problems in the prior art and proposes 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: A battery core shell with a stepped explosion-proof valve, comprising:

[0007] A shell, and an explosion-proof valve installation hole is arranged on the side of the shell, wherein the inner and outer side surfaces of one side of the shell where the explosion-proof valve installation hole is located are respectively an inner plane of the shell and an outer plane of the shell;

[0008] The explosion-proof valve comprises a valve body, a skirt is arranged along the edge of the valve body, and a first step portion is arranged on the skirt, wherein the skirt is overlapped on the outer plane of the shell where the explosion-proof valve mounting hole is located through the first step portion to realize the external placement of the first step portion on the skirt; or the inner plane of the shell where the explosion-proof valve mounting hole is located is overlapped on the first step portion of the skirt to realize the internal placement of the first step portion on the skirt, and the explosion-proof valve is fixed to the shell by welding.

[0009] In the above-mentioned battery cell shell with a stepped explosion-proof valve, the first step portion includes a first step and a second step, and the first step is connected to the valve body, and the second step is connected to the first step, wherein the explosion-proof valve is fixed by welding the second step to the shell.

[0010] In the above-mentioned battery cell shell with a stepped explosion-proof valve, the inner and outer side surfaces of the first step are respectively the first step inner plane and the first step outer plane, and the inner and outer side surfaces of the second step are respectively the second step inner plane and the second step outer plane, wherein when the first step portion on the skirt is externally placed, the second step inner plane contacts and abuts against the outer plane of the shell; when the first step portion on the skirt is internally placed, the first step outer plane contacts and abuts against the inner plane of the shell.

[0011] In the above-mentioned battery cell shell with a stepped explosion-proof valve, when the first step portion on the skirt is placed outside, the outer plane of the first step and the inner plane of the second step are staggered; when the first step portion on the skirt is placed inside, the outer plane of the first step and the inner plane of the second step coincide with each other.

[0012] In the above-mentioned battery cell shell with a stepped explosion-proof valve, the inner plane of the shell and the inner plane of the first step are on the same plane, or the distance between the inner plane of the shell and the outer plane of the shell is greater than the distance between the inner plane of the first step and the outer plane of the shell.

[0013] In the above-mentioned battery cell shell with a stepped explosion-proof valve, when the first step portion on the skirt is built in, a second step portion is further provided on one side of the shell where the explosion-proof valve mounting hole is located, and the second step portion and the first step portion are stacked up and down.

[0014] In the above-mentioned battery cell shell with a stepped explosion-proof valve, when the first step portion on the skirt is built-in, the outer plane of the second step and the outer plane of the shell are on the same plane, or the distance between the outer plane of the second step and the inner plane of the shell is smaller than the distance between the inner plane of the shell and the outer plane of the shell.

[0015] In the above-mentioned battery cell shell with a stepped explosion-proof valve, the thickness of the side surface of the shell where the explosion-proof valve mounting hole is located is 0.2 mm-0.8 mm.

[0016] In the above-mentioned battery cell shell with a stepped explosion-proof valve, the valve body is arranged in a convex surface or in a concave surface.

[0017] In the above-mentioned battery cell shell with a stepped explosion-proof valve, the valve body and the skirt are integrally arranged.

[0018] The utility model also provides a battery, comprising the battery core shell with the stepped explosion-proof valve.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a battery core shell with a stepped explosion-proof valve, in which the skirt of the explosion-proof valve is arranged in a stepped structure, thereby increasing the strength of the connection between the explosion-proof valve and the shell, without increasing the thickness of the side of the shell where the explosion-proof valve is located as a whole, thereby reducing the processing difficulty and material cost of the entire battery core shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a structural schematic diagram of a battery core shell with a stepped explosion-proof valve.

[0022] Figure 2 yes Figure 1 A cross-sectional view of AA is shown.

[0023] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Figure 4 It is a structural schematic diagram of another embodiment of a battery core shell with a stepped explosion-proof valve of the utility model.

[0025] Figure 5 yes Figure 4 A cross-sectional view of BB is shown.

[0026] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0027] In the figure, 10, shell; 11, explosion-proof valve mounting hole; 12, inner plane of shell; 13, outer plane of shell; 14, second step; 20, explosion-proof valve; 21, valve body; 22, skirt; 221, first step; 2211, outer plane of first step; 2212, inner plane of first step; 222, second step; 2221, outer plane of second step; 2222, inner plane of second step. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] Embodiment 1

[0031] like Figures 1 to 3 As shown, the utility model provides a battery core shell with a stepped explosion-proof valve, comprising:

[0032] A housing 10 is provided in a frame-shaped structure, and an explosion-proof valve installation hole 11 is provided on the side of the housing 10;

[0033] The explosion-proof valve 20 includes a valve body 21, a skirt 22 is arranged along the edge of the valve body 21, and a first step portion is arranged on the skirt 22, wherein the first step portion enables the skirt 22 to be placed on the side of the shell 10 where the explosion-proof valve mounting hole 11 is located, thereby forming an external placement of the first step portion on the skirt 22, and the connection between the explosion-proof valve 20 and the shell 10 is completed by welding.

[0034] The utility model provides a battery cell shell with a stepped explosion-proof valve, in which the skirt 22 of the explosion-proof valve 20 is arranged in a stepped structure, thereby increasing the strength of the connection between the explosion-proof valve 20 and the shell 10 without increasing the thickness of the side of the shell 10 where the explosion-proof valve 20 is located as a whole, thereby reducing the processing difficulty and material cost of the entire battery cell shell.

[0035] Further preferably, the first step portion includes a first step 221 and a second step 222, and the first step 221 is embedded in the explosion-proof valve mounting hole 11 and forms an abutment fit with the hole wall of the explosion-proof valve mounting hole 11, and the second step 222 is placed on the side of the explosion-proof valve mounting hole 11.

[0036] Further preferably, the inner and outer side surfaces of the first step 221 are respectively the first step outer plane 2211 and the first step inner plane 2212, and the inner and outer side surfaces of the second step 222 are respectively the second step outer plane 2221 and the second step inner plane 2222, wherein the inner and outer side surfaces of the side where the explosion-proof valve mounting hole 11 is located are respectively the shell inner plane 12 and the shell outer plane 13, and the shell outer plane 13 contacts and abuts against the second step inner plane 2222, serving as the welding position of the shell 10 and the explosion-proof valve 20.

[0037] Further preferably, the shell inner plane 12 and the first step inner plane 2212 are on the same horizontal plane, or the distance between the shell inner plane 12 and the side opposite to the side where the explosion-proof valve installation hole 11 is located is smaller than the distance between the first step inner plane 2212 and the side opposite to the side where the explosion-proof valve installation hole 11 is located. This prevents scratches on the internal battery cells during assembly, thereby improving the safety of battery cell assembly.

[0038] Further preferably, the first step outer plane 2211 and the second step inner plane 2222 are on the same plane, and the first step outer plane 2211 and the second step inner plane 2222 are separately arranged.

[0039] Further preferably, the first step outer plane 2211 and the shell outer plane 13 are on the same horizontal plane.

[0040] Further preferably, the thickness of the side surface of the shell 10 on the side where the explosion-proof valve mounting hole 11 is located is 0.2 mm-0.8 mm, preferably 0.4 mm-0.6 mm, so as to achieve material saving.

[0041] Preferably, the valve body 21 is arranged in a convex surface or a concave surface.

[0042] Further preferably, the surface of the explosion-proof valve 20 is provided with notches.

[0043] Embodiment 2

[0044] like Figures 4 to 6 As shown, compared with the first embodiment, the difference between this embodiment and the first embodiment is that, in this embodiment, the side surface of the shell 10 where the explosion-proof valve mounting hole 11 is located overlaps the first step portion of the skirt 22 to form a built-in first step portion on the skirt 22.

[0045] It is further pointed out that in the first embodiment, the second step 222 and the side surface of the shell 10 where the explosion-proof valve installation hole 11 is located form an upper and lower stacking arrangement; while in this embodiment, the first step 221 and the side surface of the shell 10 where the explosion-proof valve installation hole 11 is located form an upper and lower stacking arrangement.

[0046] In addition, in the first embodiment, the second step inner plane 2212 is in contact with and abuts against the shell outer plane 13 , while in this embodiment, the first step outer plane 2211 is in contact with and abuts against the shell inner plane 12 .

[0047] Further preferably, the first step outer plane 2211 and the second step inner plane 2212 are on the same plane, and the first step outer plane 2211 and the second step inner plane 2212 coincide with each other.

[0048] Further preferably, the second step outer plane 2221 is on the same plane as the shell outer plane 13 .

[0049] Preferably, a second step portion 14 is further provided on the side of the housing 10 where the explosion-proof valve mounting hole 11 is located, and the second step portion 14 is superimposed on the first step portion.

[0050] 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.

[0051] 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.

[0052] 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. A battery cell shell with a stepped explosion-proof valve, characterized in that: include: A shell, and an explosion-proof valve installation hole is arranged on the side of the shell, wherein the inner and outer side surfaces of one side of the shell where the explosion-proof valve installation hole is located are respectively an inner plane of the shell and an outer plane of the shell; The explosion-proof valve comprises a valve body, a skirt is arranged along the edge of the valve body, and a first step portion is arranged on the skirt, wherein the skirt is overlapped on the outer plane of the shell where the explosion-proof valve mounting hole is located through the first step portion to realize the external placement of the first step portion on the skirt; or the inner plane of the shell where the explosion-proof valve mounting hole is located is overlapped on the first step portion of the skirt to realize the internal placement of the first step portion on the skirt, and the explosion-proof valve is fixed to the shell by welding.

2. The battery cell shell with a stepped explosion-proof valve according to claim 1, characterized in that: The first step portion includes a first step and a second step, and the first step is connected to the valve body, and the second step is connected to the first step, wherein the explosion-proof valve is fixed by welding the second step to the shell.

3. The battery cell shell with a stepped explosion-proof valve according to claim 2, characterized in that: The inner and outer side surfaces of the first step are respectively the inner plane of the first step and the outer plane of the first step, and the inner and outer side surfaces of the second step are respectively the inner plane of the second step and the outer plane of the second step, wherein when the first step portion on the skirt is placed outside, the inner plane of the second step contacts and abuts against the outer plane of the shell; when the first step portion on the skirt is placed inside, the outer plane of the first step contacts and abuts against the inner plane of the shell.

4. The battery cell shell with a stepped explosion-proof valve according to claim 3, characterized in that: When the first step portion on the skirt is external, the outer plane of the first step and the inner plane of the second step are offset; when the first step portion on the skirt is internal, the outer plane of the first step and the inner plane of the second step coincide with each other.

5. The battery cell shell with a stepped explosion-proof valve according to claim 3, characterized in that: The inner plane of the shell and the inner plane of the first step are in the same plane, or the distance between the inner plane of the shell and the outer plane of the shell is greater than the distance between the inner plane of the first step and the outer plane of the shell.

6. The battery cell shell with a stepped explosion-proof valve according to claim 3, characterized in that: When the first step portion on the skirt is built in, a second step portion is further provided on one side of the shell where the explosion-proof valve mounting hole is located, and the second step portion and the first step portion are stacked up and down.

7. The battery cell shell with a stepped explosion-proof valve according to claim 3, characterized in that: When the first step on the skirt is built in, the outer plane of the second step is in the same plane as the outer plane of the shell, or the distance between the outer plane of the second step and the inner plane of the shell is smaller than the distance between the inner plane of the shell and the outer plane of the shell.

8. The battery cell shell with a stepped explosion-proof valve according to claim 1, characterized in that: The thickness of the side of the shell where the explosion-proof valve installation hole is located is 0.2mm-0.8mm.

9. The battery cell shell with a stepped explosion-proof valve according to claim 1, characterized in that: The valve body is arranged in a convex surface or a concave surface.

10. The battery cell shell with a stepped explosion-proof valve according to claim 1, characterized in that: The valve body and the skirt are integrally arranged.

11. A battery, characterized in that: A battery cell shell with a stepped explosion-proof valve as described in any one of claims 1 to 10.

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