Shell structure, battery monomer, battery module and battery pack

Abstract

The invention belongs to the technical field of batteries, and discloses a shell structure, a single battery, a battery module and a battery pack, the shell structure comprises a shell and an anti-explosion valve, an anti-explosion hole is formed in the wall body of the shell, the anti-explosion valve comprises a valve body, the valve body penetrates through the anti-explosion hole, a first protruding part and a second protruding part are arranged on the outer wall of the valve body, and the first protruding part and the second protruding part are arranged in the shell. The first protruding part and the second protruding part extend in the circumferential direction of the valve body and are connected end to end, and the first protruding part and the second protruding part are matched to clamp the wall body corresponding to the anti-explosion hole so as to achieve fixed connection of the anti-explosion valve and the shell. Therefore, the problem of deformation of the wall body and the valve body corresponding to the explosion-proof hole in the welding process can be avoided, the process yield of the battery monomers can be improved, and batch production of the battery monomers can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a housing structure, a battery cell, a battery module and a battery pack. Background Art

[0002] The explosion-proof valve is an important component of the battery cell. When the battery cell has an abnormality, a large amount of gas will be generated inside the battery case, causing the internal pressure of the battery case to increase sharply. At this time, the explosion-proof valve opens, and the gas inside the battery case is discharged through the opened explosion-proof valve to ensure the safety of using the battery cell.

[0003] The existing explosion-proof valve is welded at the explosion-proof hole of the battery case. Since the structural strength of the battery case near the explosion-proof hole is relatively low, the battery case in this area is prone to deformation during the welding process, and the heat generated by welding cannot be quickly dissipated, which will aggravate the deformation of the battery case. In addition, the valve body of the explosion-proof valve is usually made of relatively soft pure aluminum material and is prone to deformation during the welding process.

[0004] The deformation of the above-mentioned battery case and valve body will reduce the process yield and is not conducive to the mass production of battery cells. Summary of the Invention

[0005] The first object of the present invention is to provide a housing structure that can reduce the probability of deformation of the wall body corresponding to the explosion-proof hole and the valve body.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A housing structure, comprising:

[0008] A housing, with an explosion-proof hole provided on the wall body of the housing;

[0009] An explosion-proof valve, the explosion-proof valve includes a valve body, the valve body passes through the explosion-proof hole, and the outer wall of the valve body is provided with a first protruding portion and a second protruding portion. Both the first protruding portion and the second protruding portion extend along the circumferential direction of the valve body and are connected end to end. The first protruding portion and the second protruding portion cooperate to clamp the wall body corresponding to the explosion-proof hole.

[0010] Optionally, at least one of the space between the first protruding portion and the wall body corresponding to the explosion-proof hole, the space between the second protruding portion and the wall body corresponding to the explosion-proof hole, and the space between the outer wall of the valve body and the hole wall of the explosion-proof hole is clamped with a sealing ring.

[0011] Optionally, the sealing ring is clamped between the second protruding portion and the wall body corresponding to the explosion-proof hole.

[0012] Optionally, the thickness of the first protruding portion is T 1 , the thickness of the second protruding portion is T 2 , and the thickness of the sealing ring is T 3 ;

[0013] 1≤T1 / (T 2 +T 3 ) ≤ 1.25;

[0014] And / or, T 2 ≥ 0.8 mm.

[0015] Optionally, in a direction away from the axis of the explosion-proof hole, the dimension by which the first protrusion protrudes from the outer wall of the valve body is W 1 , and the dimension by which the second protrusion protrudes from the outer wall of the valve body is W 2 . When the sealing ring is in a natural state, the inner diameter of the sealing ring is r, and the outer diameter of the sealing ring is R, and W 3 = (R - r) / 2;

[0016] W 1 ≥ 1.3 mm;

[0017] And / or, W 2 ≥ W 1 ;

[0018] And / or, W 2 -W 3 ≥ 0.3 mm.

[0019] Optionally, the second protrusion is located inside the housing, and the first protrusion is located outside the housing.

[0020] Optionally, both the first protrusion and the second protrusion are formed by a riveting process.

[0021] The second object of the present invention is to provide a battery cell with a high process yield.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] A battery cell, comprising a pole group and the above-mentioned housing structure, and the pole group is arranged inside the housing.

[0024] The third object of the present invention is to provide a battery module with a high process yield.

[0025] To achieve this purpose, the present invention adopts the following technical solutions:

[0026] A battery module, comprising at least two of the above-mentioned battery cells.

[0027] The fourth object of the present invention is to provide a battery pack with a high process yield.

[0028] To achieve this purpose, the present invention adopts the following technical solutions:

[0029] A battery pack, comprising a battery box and the above-mentioned battery module, and the battery module is arranged inside the battery box.

[0030] Advantages of the present invention:

[0031] For the housing structure provided by the present invention, the valve body of the explosion-proof valve passes through the explosion-proof hole, and the outer wall of the valve body is provided with a first protruding portion and a second protruding portion. Both the first protruding portion and the second protruding portion extend along the circumferential direction of the valve body and are connected end to end. The first protruding portion and the second protruding portion cooperate to clamp the wall body corresponding to the explosion-proof hole, so as to realize the fixed connection between the explosion-proof valve and the housing. It can be seen that this housing structure omits the welding process between the explosion-proof valve and the housing, and thus can avoid the problem of deformation of the wall body corresponding to the explosion-proof hole and the valve body during the welding process, which is beneficial to improving the manufacturing yield of the battery cell and realizing the mass production of the battery cell. Description of the drawings

[0032] Figure 1 is the first schematic structural diagram of the housing structure provided by the present invention;

[0033] Figure 2 is the exploded structural diagram of the housing structure provided by the present invention;

[0034] Figure 3 is the second schematic structural diagram of the housing structure provided by the present invention;

[0035] Figure 4 is Figure 3 the sectional view taken along the E-E direction in;

[0036] Figure 5 is Figure 4 the partial enlarged view at A in;

[0037] Figure 6 is the first schematic structural diagram of the explosion-proof valve provided by the present invention;

[0038] Figure 7 is the second schematic structural diagram of the explosion-proof valve provided by the present invention;

[0039] Figure 8 is Figure 7 the sectional view taken along the F-F direction in;

[0040] Figure 9 is the schematic structural diagram of the sealing ring provided by the present invention;

[0041] Figure 10 is the exploded structural diagram of the battery cell provided by the present invention.

[0042] In the figure:

[0043] 100, housing; 110, explosion-proof hole; 120, opening; 200, explosion-proof valve; 210, valve body; 211, first protrusion; 212, second protrusion; 213, exhaust hole; 220, valve disc; 300, sealing ring; 400, cover plate; 10, electrode group. Detailed implementation manner

[0044] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0045] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "above and over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] This embodiment provides a housing structure that can reduce the probability of deformation of the wall corresponding to the explosion-proof hole and the valve body.

[0049] Specifically, as Figures 1 to 6As shown in the figure, the housing structure includes a housing 100 and an explosion-proof valve 200. Among them, an explosion-proof hole 110 is provided on the wall of the housing 100. The explosion-proof valve 200 includes a valve body 210 and a valve plate 220. The valve body 210 is inserted through the explosion-proof hole 110. The valve body 210 is provided with an exhaust hole 213. The valve plate 220 is arranged in the exhaust hole 213 and blocks the exhaust hole 213. There is a notch (not shown in the figure) on the valve plate 220. When the pressure inside the housing 100 reaches the bursting value, the notch breaks to discharge the high-pressure gas inside the housing 100. The outer wall of the valve body 210 is provided with a first protrusion 211 and a second protrusion 212. The first protrusion 211 and the second protrusion 212 are respectively located at opposite ends of the exhaust hole 213. The first protrusion 211 and the second protrusion 212 both extend along the circumferential direction of the valve body 210 and are connected end to end. The first protrusion 211 and the second protrusion 212 cooperate to clamp the corresponding wall of the explosion-proof hole 110.

[0050] Based on the above design, the valve body 210 of the explosion-proof valve 200 is inserted through the explosion-proof hole 110, and the outer wall of the valve body 210 is provided with a first protrusion 211 and a second protrusion 212. The first protrusion 211 and the second protrusion 212 both extend along the circumferential direction of the valve body 210 and are connected end to end. The first protrusion 211 and the second protrusion 212 cooperate to clamp the corresponding wall of the explosion-proof hole 110 to realize the fixed connection between the explosion-proof valve 200 and the housing 100. It can be seen that this housing structure omits the welding process between the explosion-proof valve 200 and the housing 100, and thus can avoid the problem of deformation of the corresponding wall of the explosion-proof hole 110 and the valve body 210 during the welding process, which is beneficial to improving the manufacturing yield of the battery cell and realizing the mass production of the battery cell.

[0051] In this embodiment, both the first protrusion 211 and the second protrusion 212 are formed by a riveting process. When assembling the explosion-proof valve 200 and the housing 100, first insert the valve body 210 into the explosion-proof hole 110 to make the exhaust hole 213 coaxial with the explosion-proof hole 110, and then perform riveting at both ends of the exhaust hole 213. A first protrusion 211 is formed at the edge of one end of the exhaust hole 213, and a second protrusion 212 is formed at the edge of the other end of the exhaust hole 213, so that the first protrusion 211 and the second protrusion 212 cooperate to clamp the corresponding wall of the explosion-proof hole 110, completing the fixed connection between the valve body 210 and the housing 100. The riveting process is a relatively mature production process in the field, with simple operation and high efficiency, which is beneficial to improving production efficiency and reducing production costs.

[0052] It should be noted that the housing structure provided in this embodiment is applicable to various shaped battery cells such as square battery cells, cylindrical battery cells, and irregularly shaped battery cells.

[0053] Such as Figure 1 and Figure 10As shown, in this embodiment, the battery cell has a rectangular structure, that is, the housing 100 is rectangular. The housing structure further includes a cover plate 400. An opening 120 is provided at an end of the housing 100 in the length direction ( Figure 1 the x-direction in it), and the cover plate 400 seals the opening 120. The explosion-proof hole 110 in this embodiment is opened on the housing 100, that is, the explosion-proof valve 200 is arranged on the housing 100. Compared with arranging the explosion-proof valve 200 on the cover plate 400, the design of arranging the explosion-proof valve 200 on the housing 100 can shorten the exhaust path of the high-pressure gas in the housing 100 during thermal runaway, which is beneficial to improving the use safety of the battery cell.

[0054] Furthermore, the explosion-proof hole 110 is opened at the middle position of the housing 100 along its length direction ( Figure 1 the x-direction in it), that is, the explosion-proof valve 200 is located at the middle position of the housing 100 along its length direction ( Figure 1 the x-direction in it), so that the high-pressure gas in different regions of the housing 100 can be quickly discharged from the housing 100 during thermal runaway, achieving the effect of further improving the use safety of the battery cell.

[0055] Optionally, at least one of the spaces between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110, and between the outer wall of the valve body 210 and the hole wall of the explosion-proof hole 110 is clamped with a sealing ring 300 to achieve the seal between the valve body 210 and the housing 100, prevent the high-pressure gas in the housing 100 from leaking through the gap between the explosion-proof hole 110 and the valve body 210 when the notch is not disconnected, and at the same time prevent the electrolyte in the housing 100 from overflowing.

[0056] In this embodiment, the sealing ring 300 is clamped between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110. In another embodiment, the sealing ring 300 is clamped between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, or the sealing ring 300 is clamped between the outer wall of the valve body 210 and the hole wall of the explosion-proof hole 110. In yet another embodiment, the number of the sealing rings 300 is two, one of the sealing rings 300 is clamped between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, and the other sealing ring 300 is clamped between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110. In still another embodiment, along the axial direction of the sealing ring 300, the sealing ring 300 is divided into a first sealing section and a second sealing section. The first sealing section is clamped between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, and the second sealing section is clamped between the outer wall of the valve body 210 and the hole wall of the explosion-proof hole 110; or, the first sealing section is clamped between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110, and the second sealing section is clamped between the outer wall of the valve body 210 and the hole wall of the explosion-proof hole 110; or, along the axial direction of the sealing ring 300, the sealing ring 300 is divided into a first sealing section, a second sealing section and a third sealing section. The first sealing section is clamped between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, the second sealing section is clamped between the outer wall of the valve body 210 and the hole wall of the explosion-proof hole 110, and the third sealing section is clamped between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110.

[0057] Further, the second protruding portion 212 is located inside the housing 100, and the first protruding portion 211 is located outside the housing 100. That is to say, in this embodiment, the sealing ring 300 clamped between the second protruding portion 212 and the edge of the explosion-proof hole 110 is located inside the housing 100. Furthermore, the sealing between the valve body 210 and the housing 100 is achieved on the inner wall of the housing 100, which can maximally avoid the electrolyte in the housing 100 from overflowing.

[0058] Optionally, as Figure 7 and Figure 8 shown, the thickness of the second protruding portion 212 (i.e., the dimension of the second protruding portion 212 along the axis direction of the explosion-proof hole 110) is T 2 , T 2 ≥0.8 mm. Exemplarily, T 2It can be 0.8 mm, 0.9 mm, 1.2 mm, etc., so that the second protruding portion 212 has relatively high structural strength. Further, the second protruding portion 212 can tightly press the sealing ring 300 against the wall body corresponding to the explosion-proof hole 110, achieving the effect of improving the sealing performance between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110. Secondly, the second protruding portion 212 having relatively high structural strength is beneficial to improving the sealing consistency between the second protruding portion 212 and the wall body corresponding to the explosion-proof hole 110 in the circumferential direction of the explosion-proof hole 110. Thirdly, when the second protruding portion 212 has relatively high structural strength, the probability of the second protruding portion 212 cracking and deforming due to riveting is relatively low, providing further guarantee for the sealing reliability between the valve body 210 and the housing 100, and also improving the initiation yield of the explosion-proof valve 200. Finally, when the second protruding portion 212 has relatively high structural strength, the reliability of the second protruding portion 212 and the first protruding portion 211 cooperating to clamp the wall body corresponding to the explosion-proof hole 110 is relatively high. Further, the reliability of the connection between the valve body 210 and the housing 100 can be improved, making the explosion-proof valve 200 have relatively high torsion resistance and thrust resistance.

[0059] Optionally, the thickness of the first protruding portion 211 (i.e., the dimension of the first protruding portion 211 along the axis direction of the explosion-proof hole 110) is T 1 , and the thickness of the sealing ring 300 (i.e., the dimension of the sealing ring 300 along the axis direction of the explosion-proof hole 110) is T 3 , 1 ≤ T 1 / (T 2 + T 3 ) ≤ 1.25. Exemplarily, T 1 / (T 2 + T 3 ) can be 1, 1.08, 1.2, 1.25, etc. If T 1 / (T 2 + T 3 ) < 1, the structural strength of the first protruding portion 211 is relatively low, which will reduce the sealing performance between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, also reduce the sealing consistency between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110 in the circumferential direction of the explosion-proof hole 110, and reduce the reliability of the first protruding portion 211 and the second protruding portion 212 cooperating to clamp the wall body corresponding to the explosion-proof hole 110. Further, the reliability of the connection between the valve body 210 and the housing 100 is reduced, making the torsion resistance and thrust resistance of the explosion-proof valve 200 on the housing 100 unable to be guaranteed. In addition, if the structural strength of the first protruding portion 211 is relatively low, the first protruding portion 211 is prone to cracking and deformation problems during the riveting process, which will not only reduce the sealing performance between the first protruding portion 211 and the wall body corresponding to the explosion-proof hole 110, but also reduce the initiation yield of the explosion-proof valve 200. If T 1 / (T 2 + T3 ) > 1.25, the thickness of the first protruding portion 211 is too large, which will increase the weight and volume of the housing structure and is not conducive to improving the energy density of the battery cell.

[0060] Optionally, along the direction away from the axis of the explosion-proof hole 110, the dimension by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 is W 1 , W 1 ≥ 1.3 mm. Exemplarily, W 1 can be 1.3 mm, 1.5 mm, 2.3 mm, etc. If W 1 is less than 1.3 mm, the structural strength of the first protruding portion 211 is relatively low, which will reduce the sealing performance between the first protruding portion 211 and the wall corresponding to the explosion-proof hole 110, and also reduce the sealing consistency between the first protruding portion 211 and the wall corresponding to the explosion-proof hole 110 in the circumferential direction of the explosion-proof hole 110; secondly, if the structural strength of the first protruding portion 211 is relatively low, the first protruding portion 211 is prone to cracking and deformation problems during the riveting process, which will not only reduce the sealing performance between the first protruding portion 211 and the wall corresponding to the explosion-proof hole 110, but also reduce the initiation yield rate of the explosion-proof valve 200; thirdly, when W 1 is less than 1.3 mm, the dimension by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 is relatively small, which will reduce the area where the first protruding portion 211 is in contact with the wall corresponding to the explosion-proof hole 110, and further reduce the reliability of the cooperation between the first protruding portion 211 and the second protruding portion 212 to clamp the wall corresponding to the explosion-proof hole 110, reducing the reliability of the connection between the valve body 210 and the housing 100, and making it impossible to guarantee the torsional resistance and pushing resistance of the explosion-proof valve 200 on the housing 100.

[0061] Optionally, along the direction away from the axis of the explosion-proof hole 110, the dimension by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 is W 2 , W 2 ≥ W 1 , when W 2 is equal to W 1 , the area where the second protruding portion 212 is in contact with the wall corresponding to the explosion-proof hole 110 is equal to the area where the first protruding portion 211 is in contact with the edge of the explosion-proof hole 110. This structure can not only improve the reliability of the cooperation between the first protruding portion 211 and the second protruding portion 212 to clamp the wall corresponding to the explosion-proof hole 110, but also improve the sealing consistency between the first protruding portion 211 and the second protruding portion 212 and the wall corresponding to the explosion-proof hole 110 respectively, playing a role in guaranteeing the reliability and sealing performance of the connection between the valve body 210 and the housing 100. When W 2 is greater than W 1When the second protruding portion 212 is in close contact with the wall corresponding to the explosion-proof hole 110, the area of contact is larger than that of the first protruding portion 211 in contact with the wall corresponding to the explosion-proof hole 110. This makes the sealing performance between the first protruding portion 211 and the wall corresponding to the explosion-proof hole 110 slightly better than that between the second protruding portion 212 and the wall corresponding to the explosion-proof hole 110. Since the second protruding portion 212 is inside the housing 100 and the first protruding portion 211 is outside the housing 100, the sealing performance between the valve body 210 and the inner side of the housing 100 is greater than that between the valve body 210 and the outer side of the housing 100, which further reduces the probability of electrolyte leakage from inside the housing 100.

[0062] Optionally, when the sealing ring 300 is in its natural state, the inner diameter of the sealing ring 300 is r, and the outer diameter is R, and W 3 =(R - r) / 2, and W 2 -W 3 ≥0.3 mm. Exemplarily, W 2 -W 3 can be 0.3 mm, 0.35 mm, or 0.4 mm, etc. This structural design can prevent the part of the sealing ring 300 far from the axis from protruding beyond the second protruding portion 212, ensuring that the entire sealing ring 300 is pressed tightly between the second protruding portion 212 and the wall corresponding to the explosion-proof valve 200, thus providing a guarantee for the sealing performance between the second protruding portion 212 and the wall corresponding to the explosion-proof valve 200.

[0063] It should be noted that the housing structure provided in this embodiment is applicable to explosion-proof holes 110 in shapes such as circular, oval, or square. Of course, the shapes of the sealing ring 300, the valve body 210, and the valve plate 220 are adapted to the shape of the explosion-proof hole 110. As Figure 2 、 Figure 7 and Figure 9 shown, the explosion-proof hole 110, the sealing ring 300, the valve body 210, and the valve plate 220 in this embodiment are all in an oval structure.

[0064]

[0065] Table 1 provides six groups of examples and six groups of comparative examples. The material of the housing 100 in the six groups of examples and six groups of comparative examples is imported aluminum alloy MXF2, the valve body 210 is made of aluminum, and the sealing ring 300 is made of modified fluororubber with good high-temperature resistance.

[0066] In Example 1, the thickness T 1 of the first protruding portion 211 is 1.2 mm, the thickness T 2 of the second protruding portion 212 is 0.8 mm, and the thickness T 3is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 1. The dimension W by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3.3 mm, W 2 -W 3 is 0.3 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform, and both the anti-pushing ability and anti-twisting ability of the explosion-proof valve 200 meet the requirements, and the explosion-proof valve 200 can pass the sealed helium detection test and the burst value test.

[0067] In Embodiment 2, the thickness T of the first protruding portion 211 1 is 1.3 mm, and the thickness T of the second protruding portion 212 2 is 0.85 mm. The thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 1.04. The dimension W by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3.3 mm, W 2 -W 3 is 0.3 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform, and both the anti-pushing ability and anti-twisting ability of the explosion-proof valve 200 meet the requirements, and the explosion-proof valve 200 can pass the sealed helium detection test and the burst value test.

[0068] In Embodiment 3, the thickness T of the first protruding portion 211 1 is 1.4 mm, and the thickness T of the second protruding portion 212 2 is 0.9 mm. The thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 1.08. The dimension W by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W2 -W 3 is 0.6 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform, and both the anti-pushing ability and anti-twisting ability of the explosion-proof valve 200 meet the requirements, and the explosion-proof valve 200 can pass the sealed helium detection test and the burst value test.

[0069] In Embodiment 4, the thickness T of the first protruding portion 211 1 is 1.5 mm, the thickness T of the second protruding portion 212 2 is 0.95 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W of the first protruding portion 211 protruding from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 1.11, the dimension W of the second protruding portion 212 protruding from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W 2 -W 3 is 0.6 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform, and both the anti-pushing ability and anti-twisting ability of the explosion-proof valve 200 meet the requirements, and the explosion-proof valve 200 can pass the sealed helium detection test and the burst value test.

[0070] In Embodiment 5, the thickness T of the first protruding portion 211 1 is 1.6 mm, the thickness T of the second protruding portion 212 2 is 1.00 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W of the first protruding portion 211 protruding from the outer wall of the valve body 210 1 is 1.3 mm, T 1 / (T 2 +T 3 ) = 1.14, the dimension W of the second protruding portion 212 protruding from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 2.9 mm, W 2 -W 3 is 0.7 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform, and both the anti-pushing ability and anti-twisting ability of the explosion-proof valve 200 meet the requirements, and the explosion-proof valve 200 can pass the sealed helium detection test and the burst value test.

[0071] In Embodiment 6, the thickness T of the first protruding portion 211 1is 1.8 mm, the thickness T of the second protruding portion 212 2 is 1.05 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W of the first protruding portion 211 protruding from the outer wall of the valve body 210 1 is 1.4 mm, T 1 / (T 2 +T 3 ) = 1.24, the dimension W of the second protruding portion 212 protruding from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 2.9 mm, W 2 -W 3 is 0.7 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform. The anti-pushing ability and anti-twisting ability of the explosion-proof valve 200 both meet the requirements, and the explosion-proof valve 200 can pass the helium seal test and the burst value test.

[0072] In Comparative Example 1, the thickness T of the first protruding portion 211 1 is 1.2 mm, the thickness T of the second protruding portion 212 2 is 0.75 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W of the first protruding portion 211 protruding from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 1.04, the dimension W of the second protruding portion 212 protruding from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W 2 -W 3 is 0.6 mm. After the explosion-proof valve 200 is assembled with the housing 100, due to the relatively thin thickness of the second protruding portion 212, the structural strength of the second protruding portion 212 is low. Therefore, the sealing performance between the explosion-proof valve 200 and the housing 100 is poor. Especially in the circumferential direction of the explosion-proof hole 110, the sealing consistency between the explosion-proof valve 200 and the housing 100 is poor, resulting in the qualified rate of the housing structure being less than 98%. It should be noted that the qualified rate of the housing structure here considers the sealing performance between the explosion-proof valve 200 and the housing 100 and the anti-pushing ability of the explosion-proof valve 200. That is, when the explosion-proof valve 200 cannot pass the helium seal test, and / or when the explosion-proof valve 200 cannot pass the anti-pushing ability test, the housing structure is regarded as unqualified.

[0073] In Comparative Example 2, the thickness T of the first protruding portion 211 1 is 1.1 mm, the thickness T of the second protruding portion 2122 is 0.8 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 0.92. The dimension W by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W 2 -W 3 is 0.6 mm. After the explosion-proof valve 200 and the housing 100 are assembled, due to the relatively thin thickness of the first protruding portion 211, the structural strength of the first protruding portion 211 is low. Therefore, the sealing performance between the explosion-proof valve 200 and the housing 100 is poor. Especially in the circumferential direction of the explosion-proof hole 110, the sealing consistency between the explosion-proof valve 200 and the housing 100 is poor, resulting in the qualification rate of the housing structure being less than 98%. It should be noted that the qualification rate of the housing structure here considers the sealing performance between the explosion-proof valve 200 and the housing 100 and the anti-pushing ability of the explosion-proof valve 200. That is, when the explosion-proof valve 200 cannot pass the sealing helium detection test, and / or when the explosion-proof valve 200 cannot pass the anti-pushing ability test, the housing structure is regarded as unqualified.

[0074] In Comparative Example 3, the thickness T of the first protruding portion 211 1 is 1.2 mm, the thickness T of the second protruding portion 212 2 is 0.85 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 0.96. The dimension W by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W 2 -W 3is 0.6 mm. After the explosion-proof valve 200 is assembled with the housing 100, due to the relatively thin thickness of the first protruding portion 211, the structural strength of the first protruding portion 211 is low. Therefore, the sealing performance between the explosion-proof valve 200 and the housing 100 is poor. Especially in the circumferential direction of the explosion-proof hole 110, the sealing consistency between the explosion-proof valve 200 and the housing 100 is poor, resulting in the qualification rate of the housing structure being less than 98%. It should be noted that the qualification rate of the housing structure here considers the sealing performance between the explosion-proof valve 200 and the housing 100 and the anti-pushing ability of the explosion-proof valve 200. That is, when the explosion-proof valve 200 fails the helium leak detection test and / or the explosion-proof valve 200 fails the anti-pushing ability test, the housing structure is regarded as unqualified.

[0075] In Comparative Example 4, the thickness T of the first protruding portion 211 1 is 1.25 mm, the thickness T of the second protruding portion 212 2 is 0.9 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 0.96, the dimension W by which the second protruding portion 212 protrudes from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W 2 -W 3 is 0.6 mm. After the explosion-proof valve 200 is assembled with the housing 100, due to the relatively thin thickness of the first protruding portion 211, the structural strength of the first protruding portion 211 is low. Therefore, the sealing performance between the explosion-proof valve 200 and the housing 100 is poor. Especially in the circumferential direction of the explosion-proof hole 110, the sealing consistency between the explosion-proof valve 200 and the housing 100 is poor, resulting in the qualification rate of the housing structure being less than 98%. It should be noted that the qualification rate of the housing structure here considers the sealing performance between the explosion-proof valve 200 and the housing 100 and the anti-pushing ability of the explosion-proof valve 200. That is, when the explosion-proof valve 200 fails the helium leak detection test and / or the explosion-proof valve 200 fails the anti-pushing ability test, the housing structure is regarded as unqualified.

[0076] In Comparative Example 5, the thickness T of the first protruding portion 211 1 is 1.5 mm, the thickness T of the second protruding portion 212 2 is 0.95 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. Along the direction away from the axis of the explosion-proof hole 110, the dimension W by which the first protruding portion 211 protrudes from the outer wall of the valve body 210 1 is 1.2 mm, T1 / (T 2 +T 3 ) = 1.11, the dimension W of the second protruding portion 212 protruding from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3 mm, W 2 -W 3 is 0.6 mm. After the explosion-proof valve 200 and the housing 100 are assembled, due to the fact that in the direction away from the axis of the explosion-proof hole 110, the dimension of the first protruding portion 211 protruding from the outer wall of the valve body 210 is small, the structural strength of the first protruding portion 211 is low, and the pressing area between the first protruding portion 211 and the edge of the explosion-proof hole 110 is small. Therefore, the sealing performance between the explosion-proof valve 200 and the housing 100 is poor. Especially in the circumferential direction of the explosion-proof hole 110, the sealing consistency between the explosion-proof valve 200 and the housing 100 is poor, resulting in the qualified rate of the housing structure being less than 98%. It should be noted that the qualified rate of the housing structure here considers the sealing performance between the explosion-proof valve 200 and the housing 100 and the anti-pushing ability of the explosion-proof valve 200. That is, when the explosion-proof valve 200 fails to pass the helium leak detection test, and / or when the explosion-proof valve 200 fails to pass the anti-pushing ability test, the housing structure is regarded as unqualified.

[0077] In Comparative Example 6, the thickness T of the first protruding portion 211 1 is 1.3 mm, the thickness T of the second protruding portion 212 2 is 0.85 mm, the thickness T of the sealing ring 300 3 is 0.4 mm. In the direction away from the axis of the explosion-proof hole 110, the dimension W of the first protruding portion 211 protruding from the outer wall of the valve body 210 1 is 1.5 mm, T 1 / (T 2 +T 3 ) = 1.04, the dimension W of the second protruding portion 212 protruding from the outer wall of the valve body 210 2 is 3.6 mm, W 3 is 3.4 mm, W 2 -W 3is 0.2 mm. After the explosion-proof valve 200 is assembled with the housing 100, the valve body 210 does not deform. The anti-pushing ability and anti-torsion ability of the explosion-proof valve 200 both meet the requirements. However, due to the small distance between the outer wall of the sealing ring 300 and the side wall of the second protrusion 212, when the first protrusion 211 and the second protrusion 212 are formed by riveting, due to part processing tolerances and process fluctuations, it is easy for the sealing ring 300 to exceed the second protrusion 212 after compression. Moreover, the amount by which the sealing ring 300 exceeds the second protrusion 212 is not uniform, that is, the compression amount of the sealing ring 300 is different, which in turn leads to non-uniform sealing between the wall of the second protrusion 212 corresponding to the explosion-proof hole 110, and finally results in the helium leak detection pass rate of the explosion-proof valve being <97%.

[0078] In summary, when T 2 ≥0.8 mm, 1 ≤ T 1 / (T 2 +T 3 ) ≤ 1.25, W 1 ≥ 1.3 mm, and W 2 -W 3 ≥ 0.3 mm, the explosion-proof valve 200 is fixed on the housing 100 through the riveting process. The probability of deformation of the valve body 210 of the explosion-proof valve 200 is relatively low, and the probabilities of the explosion-proof valve 200 passing the thrust test, torsion test, sealed helium leak detection test, and burst value test are relatively high.

[0079] This embodiment also provides a battery cell. As Figure 10 shown, the battery cell includes a pole group 10 and the above-mentioned housing structure. The pole group 10 is arranged in the housing 100. The battery cell adopts the above-mentioned housing structure, and the connection between the explosion-proof valve 200 and the housing 100 can be realized without welding, thereby avoiding the problem of deformation of the wall corresponding to the explosion-proof hole 110 and the valve body 210 during the welding process, having the effect of improving the process yield of the battery cell, and being conducive to realizing the mass production of the battery cell.

[0080] This embodiment also provides a battery module. The battery module includes at least two of the above-mentioned battery cells. The battery module adopts the above-mentioned battery cells and has a relatively high process yield.

[0081] This embodiment also provides a battery pack. The battery pack includes a battery box and the above-mentioned battery module. The battery module is arranged in the battery box. The battery pack adopts the above-mentioned battery module and has a relatively high process yield.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Shell structure, characterized in that, include: A shell (100), wherein an explosion-proof hole (110) is provided on a wall of the shell (100); An explosion-proof valve (200), the explosion-proof valve (200) comprising a valve body (210), the valve body (210) being inserted into the explosion-proof hole (110), the outer wall of the valve body (210) being provided with a first protrusion (211) and a second protrusion (212), the first protrusion (211) and the second protrusion (212) both extending along the circumference of the valve body (210) and being connected end to end, the first protrusion (211) and the second protrusion (212) cooperating to clamp the wall body corresponding to the explosion-proof hole (110).

2. The housing structure according to claim 1, characterized in that: A sealing ring (300) is provided between at least one of the first protrusion (211) and the wall corresponding to the explosion-proof hole (110), between the second protrusion (212) and the wall corresponding to the explosion-proof hole (110), and between the outer wall of the valve body (210) and the hole wall of the explosion-proof hole (110).

3. The housing structure according to claim 2, characterized in that: The sealing ring (300) is sandwiched between the second protruding portion (212) and the wall corresponding to the explosion-proof hole (110).

4. The housing structure according to claim 3, characterized in that: The thickness of the first protruding portion (211) is T1, the thickness of the second protruding portion (212) is T2, and the thickness of the sealing ring (300) is T3; 1≤T1 / (T2+T3)≤1.25; And / or, T2 ≥ 0.8 mm.

5. The housing structure according to claim 3, characterized in that: Along the direction away from the axis of the explosion-proof hole (110), the first protrusion (211) protrudes from the outer wall of the valve body (210) by a dimension W1, and the second protrusion (212) protrudes from the outer wall of the valve body (210) by a dimension W2, when the sealing ring (300) is in a natural state, the inner diameter of the sealing ring (300) is r, and the outer diameter of the sealing ring (300) is R, and W3=(Rr) / 2; W1≥1.3mm; and / or, W2 ≥ W1; And / or, W2-W3≥0.3mm.

6. The housing structure according to any one of claims 3 to 5, characterized in that: The second protruding portion (212) is located inside the housing (100), and the first protruding portion (211) is located outside the housing (100).

7. The housing structure according to any one of claims 1 to 5, characterized in that: The first protruding portion (211) and the second protruding portion (212) are both formed by a riveting process.

8. A battery cell, characterized in that: It comprises a pole group (10) and a shell structure according to any one of claims 1 to 7, wherein the pole group (10) is arranged in the shell (100).

9. A battery module, characterized in that: The battery comprises at least two battery cells according to claim 8.

10. A battery pack, characterized in that: It comprises a battery box and the battery module as claimed in claim 9, wherein the battery module is arranged in the battery box.

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