Case structure and battery

Abstract

The utility model discloses a kind of shell structure and battery, shell structure includes shell main body, pole, adapter, first insulating rubber block and second insulating rubber block, shell main body has mounting hole, pole includes end and column, end is located at the outside of shell main body, column is connected to the side of end towards shell main body, column passes through mounting hole, and gap exists between column and the hole wall of mounting hole;Adapter is located at the inside of shell main body;First insulating rubber block and second insulating rubber block are flexible piece, first insulating rubber block includes first insulating part and second insulating part, second insulating rubber block includes third insulating part and fourth insulating part.The utility model is extruded insulating rubber block by the force when pole and adapter are connected, so that first insulating part and third insulating part fill into gap and mutually abut, avoid the contact interface separation of first insulating part and third insulating part when end or adapter is stressed, reduce insulation failure risk.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a casing structure and a battery. Background Technology

[0002] In related technologies, the insulation design between the electrode and the housing typically employs a contour-mimicking nested insulation structure. This involves using a three-dimensional morphology matching design to ensure the insulating medium fully fills the interface gap between the electrode and the housing, creating a continuous physical barrier. However, traditional rigid insulation components are prone to cracking due to long-term thermo-oxidative aging of polymer materials, or the accumulation of tolerances can lead to localized electric field concentrations in the assembly gaps. These defects are similar to the electric field distortion and creepage risks caused by micropores in the resin coating layer during semiconductor molding processes, which may induce insulation failure under humid and hot environments or voltage surges. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a shell structure that can fill the space between the pole body and the mounting hole wall by deforming insulating rubber blocks, absorbing the processing errors of each component and the assembly errors between components, avoiding interface separation when the end or adapter is under stress, and reducing the risk of insulation failure.

[0004] This utility model also proposes a battery having the above-mentioned casing structure.

[0005] In a first aspect, embodiments of this application provide a shell structure, including:

[0006] The main body of the shell has mounting holes;

[0007] An adapter, located on the inner side of the housing body, is used to connect to the tabs of the electrode assembly;

[0008] The pole includes an end and a column. The end is located on the outside of the housing body, and the column is connected to the side of the end facing the housing body. The column passes through the mounting hole and is connected to the adapter, and there is a gap between the column and the wall of the mounting hole.

[0009] The first insulating block and the second insulating block are both flexible components. The first insulating block includes a first insulating portion and a second insulating portion. The first insulating portion fills the gap, and the second insulating portion is connected to the first insulating portion and disposed between the end and the shell body. The second insulating block includes a third insulating portion and a fourth insulating portion. The third insulating portion fills the gap and abuts against the first insulating portion. The fourth insulating portion is connected to the third insulating portion and disposed between the adapter and the shell body.

[0010] The housing structure according to the present utility model embodiment has at least the following beneficial effects: the force exerted when the pole is connected to the adapter causes the insulating block to be squeezed, so that the first insulating part and the third insulating part filling the gap between the pole and the hole wall of the mounting hole abut against each other, absorbing the processing error of each component and the assembly error between each component, avoiding interface separation when the end or adapter is under force, thereby reducing the risk of insulation failure.

[0011] According to the first aspect, in one possible implementation, both the first insulating block and the second insulating block have a natural state and a deformed state;

[0012] Both the first insulating block and the second insulating block are ring-shaped when in their natural state.

[0013] When the first insulating block is in the deformed state, it includes the first insulating part and the second insulating part; when the second insulating block is in the deformed state, it includes the third insulating part and the fourth insulating part.

[0014] The end of the column away from the end head is connected to the adapter so that the first insulating block and the second insulating block are deformed from the natural state to the deformed state.

[0015] According to the first aspect, in one possible implementation, the compression ratio of the first insulating block when it is in the deformed state is 35% to 55%; and / or,

[0016] The second insulating block has a compression ratio of 35% to 55% when it is in the deformed state.

[0017] According to the first aspect, in one possible implementation, the projection range of the end portion along the axial direction of the mounting hole onto the second insulating portion does not exceed the edge range of the second insulating portion; and / or,

[0018] The projection range of the adapter along the axial direction of the mounting hole onto the fourth insulating part does not exceed the edge range of the fourth insulating part.

[0019] According to the first aspect, in one possible implementation, a limiting groove is provided on the outer side of the shell body, the limiting groove is connected to the mounting hole, and when the first insulating block is in the deformed state, the second insulating part is limited to the limiting groove.

[0020] According to the first aspect, in one possible implementation, when the first insulating block is in the deformed state, the thickness of the second insulating portion is greater than or equal to the depth of the limiting groove; or,

[0021] When the first insulating block is in the deformed state, the thickness of the second insulating part is less than the depth of the limiting groove. The first insulating block also includes a fifth insulating part, which fills the space between the side wall of the end and the side wall of the limiting groove.

[0022] According to the first aspect, in one possible implementation, when the first insulating block and the second insulating block are in the natural state, the size of the hollow portion of the first insulating block and the second insulating block is greater than or equal to the size of the column, and the size of the hollow portion is less than or equal to the size of the mounting hole.

[0023] According to the first aspect, in one possible implementation, the housing structure further includes insulating tape, which is sleeved on the outside of the column.

[0024] According to the first aspect, in one possible implementation, one side of the adapter has a groove, the column extends into the groove, and the adapter is connected to at least the bottom wall of the groove.

[0025] Alternatively, the adapter may have a through hole extending axially along the mounting hole, the column extending into the through hole, and the column being connected to the sidewall of the through hole.

[0026] Secondly, embodiments of this application also provide a battery, the battery including an electrode assembly and the housing structure described in the first aspect, the electrode assembly having tabs, the housing body having a mounting cavity, the electrode assembly being disposed in the mounting cavity, and the tabs being connected to the adapter.

[0027] The battery according to the present utility model embodiment has at least the following beneficial effects: by applying the above-mentioned shell structure, when the pole and the adapter are connected, the force exerted on the insulating block causes the first insulating part and the third insulating part filling the gap between the pole and the hole wall of the mounting hole to abut against each other, absorbing the processing error of each component and the assembly error between each component, avoiding interface separation when the end or adapter is under force, thereby reducing the risk of insulation failure.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0030] Figure 1 This is a disassembly diagram of the shell structure in one embodiment of the present invention;

[0031] Figure 2This is a schematic diagram of the insulating adhesive in its natural state in one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the insulating adhesive in a deformed state in one embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the connection structure between the electrode lug and the adapter in one embodiment of the present invention;

[0034] Figure 5 This is a disassembly diagram of the shell structure in another embodiment of the present invention.

[0035] Figure label:

[0036] 100. Shell body; 110. Mounting hole; 120. Limiting groove; 130. Mounting cavity;

[0037] 200, pole; 210, end; 220, column;

[0038] 300. Adapter; 310. Groove;

[0039] 400, Insulating rubber block; 410, First insulating rubber block; 411, First insulating part; 412, Second insulating part; 413, Fifth insulating part; 420, Second insulating rubber block; 421, Third insulating part; 422, Fourth insulating part; 431, Hollow part;

[0040] 500. Insulating tape;

[0041] 600. Electrode assembly; 610. Tab. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0045] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0046] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] In existing technologies, the insulation design between the battery casing and the terminals often employs a contour-mimicking nested structure, using three-dimensional morphology matching to fill the interface gaps with insulating media. However, rigid insulating components are prone to cracking due to material aging, and the accumulation of tolerances leads to electric field concentration in the assembly gaps, similar to the creepage risk caused by micropores in semiconductor molding compounds. Under humid and hot conditions or voltage surges, traditional solutions pose a risk of insulation failure.

[0048] To address the aforementioned problems, this application proposes a shell structure. In some embodiments, such as Figures 1 to 4 As shown, the housing structure includes a housing body 100, an electrode post 200, an adapter 300, and two insulating blocks 400. A mounting cavity is formed within the housing body 100 to accommodate the electrode assembly 600. The housing body 100 has a mounting hole 110 communicating with the mounting cavity 130. The electrode post 200 includes an end 210 and a column 220. The end 210 is located outside the housing body 100, and the column 220 is connected to the side of the end 210 facing the housing body 100. The end of the end 210 connected to the column 220 has an annular surface surrounding the column 220. The end 210 is located outside the housing body 100, and the column 220 passes through the mounting hole 110 and connects to the adapter 300. The adapter 300 is located inside the housing body 100 and is used to connect to the tab 610 of the electrode assembly 600.

[0049] The two insulating blocks 400 are a first insulating block 410 and a second insulating block 420. The first insulating block 410 includes a first insulating portion 411 and a second insulating portion 412. The first insulating portion 411 fills the gap, and the second insulating portion 412 is connected to the outside of the first insulating portion 411 and is located between the end 210 and the shell body 100. The second insulating block 420 includes a third insulating portion 421 and a fourth insulating portion 422. The third insulating portion 421 fills the gap and abuts against the first insulating portion 411. The fourth insulating portion 422 is connected to the outside of the third insulating portion 421 and is located between the adapter 300 and the shell body 100. Both the first insulating block 410 and the second insulating block 420 are flexible parts, that is, both the first insulating block 410 and the second insulating block 420 have elastic deformation capabilities and can be made of silicone or fluororubber. When the pole post 200 is connected to the adapter 300, the force compresses the insulating block 400, causing the first insulating part 411 and the third insulating part 421, which fill the gap between the pole 220 and the hole wall of the mounting hole 110, to abut against each other. This absorbs the processing errors of each component and the assembly errors between the components, and avoids interface separation when the end 210 or the adapter 300 is under force, thereby reducing the risk of insulation failure.

[0050] The cross-sectional shape of the column 220 of the pole post 200 can be circular, rectangular, or other regular or irregular geometric shapes, and the cross-sectional shape of the end 210 can also be circular, rectangular, or other regular or irregular geometric shapes; this application does not limit this. The shapes of the insulating block 400, the mounting hole 110, and the adapter 300 are designed according to the shape of the pole post 200.

[0051] The insulating block 400 has a natural state and a deformed state. The natural state of the insulating block 400 refers to its initial form without external force. In the natural state, the insulating block 400 is annular. In the deformed state, the insulating block 400 is thinner and radially expanded after being compressed. In the deformed state, the first insulating block 410 includes a first insulating part 411 and a second insulating part 412, and the second insulating block 420 includes a third insulating part 421 and a fourth insulating part 422. The first insulating part 411 extends into the mounting hole 110 and fills the gap between the column 220 and the inner wall of the mounting hole 110. The third insulating part 421 extends into the mounting hole 110 and fills the gap between the column 220 and the inner wall of the mounting hole 110. The second insulating parts 412 of the first insulating block 410 and the second insulating parts 412 of the second insulating block 420 abut against each other to form an annular filling layer.

[0052] Specifically, when assembling the pole post 200, first install two insulating blocks 400 to the preset position, that is, the pole body 220 passes through the mounting hole 110, but the pole body 220 and the adapter 300 remain separated. The first insulating block 410 is located between the end 210 and the shell body 100, and the second insulating block 420 is located between the adapter 300 and the shell body 100. Both the first insulating block 410 and the second insulating block 420 are in a natural state. By applying pressure to the pole post 200 and the adapter 300, the pole body 220 comes into contact with the adapter 300. At the same time, the two insulating blocks 400 are compressed and deformed by axial pressure, and their thickness is reduced to form the second insulating part 412. Meanwhile, the side of the two insulating blocks 400 near the pole body 220 deforms towards the pole body 220 to form the first insulating part 411 and the third insulating part 421. The first insulating part 411 is blocked by the end 210, and the third insulating part 421 is blocked by the adapter 300. The first insulating part 411 and the third insulating part 421 enter the gap between the pole body 220 and the hole wall of the mounting hole 110 from both ends of the mounting hole 110, and contact each other in the middle area to form a continuous filling layer.

[0053] In this embodiment, the insulating block 400 does not need to be designed as a structure that covers the column 220. Instead, it is designed as a simple ring structure. The insulating block 400 is compressed by the force exerted when the pole 200 is connected to the adapter 300, causing the insulating block 400 to deform and fill the space between the column 220 and the hole wall of the mounting hole 110. This can absorb the processing errors of each component and the assembly errors between the components. The two insulating blocks 400 have elastic deformation capability, and the two first insulating parts 411 and the third insulating part 421 abut against each other, which can prevent the connection interface of the two first insulating parts 411 and the third insulating part 421 from separating when the end 210 or the adapter 300 is subjected to external force, thereby reducing the risk of insulation failure.

[0054] In some embodiments, such as Figure 1 and Figure 2 As shown, the thickness of the insulating block 400 in its natural state is B1; as Figure 1 and Figure 3As shown, in the deformed state, the thickness of the second insulating part 412 or the fourth insulating part 422 of the insulating block 400 is B2, where 0.45≤B2 / B1≤0.65, that is, the compression rate of the first insulating block 410 in the deformed state is 35% to 55%, and the compression rate of the second insulating block 420 in the deformed state is 35% to 55%. The thickness B1 in the natural state refers to the original thickness of the insulating block 400 when it is not subjected to external force. The thickness B2 of the second insulating part 412 or the fourth insulating part 422 in the deformed state refers to the thickness of the stable compression area formed after the insulating block 400 is assembled and compressed. Specifically, it can be achieved by controlling the distance between the end 210 and the adapter 300 when the pole 200 and the adapter 300 are connected together. By limiting the compression ratio range, it is ensured that the insulating block 400 can maintain sufficient rebound force after being compressed to compensate for the dimensional changes caused by thermal expansion and contraction, while avoiding excessive compression that would cause plastic deformation of the material and loss of sealing and insulation function.

[0055] like Figures 1 to 3 As shown, both the first insulating block 410 and the second insulating block 420 have a hollow portion 431. The column 220 of the pole post 200 passes through the hollow portion 431 of the first insulating block 410, the mounting hole 110, and the hollow portion 431 of the second insulating block 420 in sequence before connecting to the adapter 300.

[0056] The first insulating block 410 is described below. In its natural state, the projection range of the end 210 along the axial direction of the mounting hole 110 onto the first insulating block 410 does not exceed the edge range of the first insulating block 410. That is, the outer edge of the first insulating block 410 coincides with the outer edge of the end 210, or the outer edge of the first insulating block 410 is located outside the outer edge of the end 210. In this case, when the first insulating block 410 is subjected to axial force, it is compressed, and the outer edge of the first insulating block 410 will also overflow beyond the edge of the end 210, thereby reducing the risk of creepage and improving the insulation reliability between the end 210 and the housing body 100.

[0057] The size of the hollow portion 431 of the first insulating block 410 is greater than or equal to the size of the column 220, which facilitates the passage of the column 220; and the size of the hollow portion 431 of the first insulating block 410 is less than or equal to the size of the mounting hole 110, which helps to reduce the space that the first insulating portion 411 needs to fill.

[0058] The shape of the second insulating block 420 is similar to that of the first insulating block 410, the only difference being that the outer edge dimension of the second insulating block 420 is designed based on the edge dimension of the adapter 300. That is, in its natural state, the projection of the adapter 300 along the axial direction of the mounting hole 110 onto the second insulating block 420 does not exceed the edge range of the second insulating block 420; that is, the outer edge of the second insulating block 420 coincides with the outer edge of the adapter 300, or the outer edge of the second insulating block 420 is located outside the outer edge of the adapter 300. In this case, when the second insulating block 420 is subjected to axial force, it is compressed, and the edge of the second insulating block 420 overflows beyond the edge of the end 210, thereby ensuring the reliability of the insulation between the end 210 and the housing body 100.

[0059] In some embodiments, such as Figures 1 to 3 As shown, a limiting groove 120 is provided on the outer side of the shell body 100. The limiting groove 120 is connected to the mounting hole 110. The first insulating rubber block 410 is disposed in the limiting groove 120. The limiting groove 120 is used to constrain the position of the first insulating rubber block 410 so that the hollow part 431 of the first insulating rubber block 410 is aligned with the mounting hole 110, so as to maintain the gap between the post 220 and the hole wall of the mounting hole 110 when the pole post 200 is installed.

[0060] For example, when the edge of the first insulating block 410 contacts the groove wall of the limiting groove 120, the first insulating block 410 is completely limited; the size of the hollow part 431 of the first insulating block 410 is the same as the size of the column 220, and it can limit the installation position of the column 220, so that when the column 220 is installed, a gap can be naturally formed between the column 220 and the hole wall of the mounting hole 110, without the need to control the assembly accuracy of the column 220.

[0061] Understandably, the above example represents an extreme case. In practical applications, it is sufficient to control the difference between the edge dimension of the first insulating block 410 and the edge dimension of the limiting groove 120 to be less than the difference between the dimension of the hollow portion 431 of the first insulating block 410 and the dimension of the mounting hole 110. Furthermore, the dimension of the mounting hole 110 of the first insulating block 410 can be designed to be larger than the dimension of the column 220 to avoid frictional resistance caused by the first insulating block 410 during the installation of the pole post 200, thereby facilitating the assembly of the pole post 200.

[0062] Based on the above embodiments, in the deformed state, the thickness of the second insulating portion 412 of the first insulating block 410 can be greater than or equal to the depth of the limiting groove 120; in this case, the end 210 and the shell body 100 are spaced apart along the axial direction of the mounting hole 110, and the first insulating block 410 only needs to separate the end 210 and the shell body 100 along the axial direction of the mounting hole 110.

[0063] Furthermore, the first insulating block 410 deforms under axial force, and the outer edge of the first insulating block 410 will also have a certain amount of overflow adhesive. The overflow adhesive on the outer edge of the first insulating block 410 can play a certain role in covering the side wall of the end 210, reducing the risk of creepage.

[0064] In the deformed state, the thickness of the second insulating portion 412 of the first insulating block 410 can be less than the depth of the limiting groove 120. In this case, part of the end 210 is located in the limiting groove 120. The first insulating block 410 also includes a fifth insulating portion 413430, which fills the annular gap between the side wall of the end 210 and the side wall of the limiting groove 120. Under the compression of the axial force, the first insulating block 410 forms a structure that matches the shape of the pole post 200.

[0065] In some embodiments, such as Figure 5 As shown, the housing structure also includes insulating tape 500. Insulating tape 500 refers to a strip or sheet structure made of insulating material, specifically polyimide film, polyester film, or fluororubber. The insulating tape 500 is sleeved on the outside of the post 220, that is, the insulating tape 500 adopts a wrapping installation, which can be achieved by heat shrink fixing, adhesive bonding, or mechanical snap-fit. It isolates the metal contact between the post 220 and the inner wall of the mounting hole 110, blocks the conductive path, and further improves the insulation reliability between the pole 200 and the housing body 100.

[0066] During installation, the insulating tape 500 is pre-fitted onto the outside of the post 220 portion of the pole 200. When the pole 200 passes through the mounting hole 110, the insulating tape 500 is located between the pole 200 and the wall of the mounting hole 110. When the pole 200 is subjected to axial clamping force, the first insulating part 411 and the third insulating part 421 formed by the compressive deformation of the insulating block 400 actually fill the space between the insulating tape 500 and the wall of the mounting hole 110.

[0067] In some embodiments, such as Figures 1 to 3 As shown, one side of the adapter 300 has a groove 310, which can be achieved by machining or stamping. The column 220 extends into the groove 310. The column 220 can be connected to the bottom wall of the groove 310, or it can be connected to both the side wall and the bottom wall of the groove 310 at the same time. The end of the column 220 away from the end 210 is blocked by the bottom wall of the groove 310, which positions the column 220 and determines the distance between the end 210 and the adapter 300, thereby controlling the compression of the insulating block 400.

[0068] Furthermore, the groove 310 is equivalent to thinning the thickness at the connection between the adapter 300 and the pole post 200, which facilitates welding and improves welding quality.

[0069] In other embodiments, the adapter 300 has a through hole extending axially along the mounting hole 110, and the column 220 extends into the through hole and is connected to the side wall of the through hole. When installing the pole post 200, the column 220 is positioned by controlling the end of the column 220 away from the end 210 to be flush with the adapter 300, thereby determining the distance between the end 210 and the adapter 300, and thus controlling the compression of the insulating block 400.

[0070] like Figures 1 to 3 As shown, the cross-sectional shape of the column 220 and the cross-sectional shape of the end 210 are both quadrilaterals, which is used as an example for explanation. The shell body 100 is a metal shell with a width of 3 mm and a wall thickness of 0.2 mm to 1.0 mm.

[0071] The dimensional relationships of the various components and structures are as follows:

[0072] The width of end 210 is 87% to 92% of the width of the shell body 100, and the length of end 210 is 2 mm to 6 mm;

[0073] The width of the column 220 is 25% to 35% of the width of the end 210, and the length of the column 220 is 25% to 35% of the length of the end 210;

[0074] The depth of the limiting groove 120 on the shell body 100 is 0.1 to 0.5 mm, the width of the limiting groove 120 is 90% to 95% of the width of the shell body 100, and the length of the limiting groove 120 is 2.2 mm to 6.6 mm; and the width of the hollow part 431 is 35% to 45% of the width of the end 210, the length of the hollow part 431 on the insulating rubber block is equal to the length of the column 220, and the length of the hollow part 431 is 35% to 45% of the length of the end 210;

[0075] The width of the insulating rubber block is 87% to 92% of the width of the shell body 100, the length of the insulating rubber block is 2 mm to 6 mm, and the thickness of the insulating rubber block is 0.2 mm to 0.5 mm. The width of the hollow part 431 is equal to the width of the column 220, and the length of the hollow part 431 is equal to the length of the column 220.

[0076] The width of the adapter 300 is 87% to 92% of the width of the shell body 100, the length of the adapter 300 is 2 mm to 6 mm, and the thickness of the adapter 300 is 0.2 mm to 2.0 mm; the width of the column 220 is 95% to 99% of the width of the groove 310 on the adapter 300, and the length of the column 220 is 95% to 99% of the length of the groove 310 on the adapter 300.

[0077] Based on the above dimensional relationships, the achievable amount of adhesive overflow Y of the insulating adhesive block 400 and the amount of adhesive overflow M required to fill the gap between the column 220 and the mounting hole 110 are calculated.

[0078] The shell body 100 has a width of 3mm, a wall thickness of 1.0mm, and a depth of 0.2mm for the limiting groove 120.

[0079] The widths of the insulating rubber block 400, the adapter 300, and the end 210 are all equal, and are taken as 87% of the width of the shell body 100, i.e., 3mm * 87% = 2.6mm.

[0080] The lengths of the insulating rubber block 400, the adapter 300, and the end 210 are all equal, and are 2.7mm.

[0081] The thickness of the insulating rubber block is 0.2mm;

[0082] The width of column 220 is 25% of the width of end 210, i.e., 2.6mm * 25% = 0.650mm; the length of column 220 is 25% of the length of end 210, i.e., 2.7mm * 25% = 0.675mm;

[0083] The width of the mounting hole 110 is 35% of the width of the end 210, i.e., 2.6mm * 35% = 0.910mm; the length of the mounting hole 110 is 35% of the length of the end 210, i.e., 2.7mm * 35% = 0.945mm.

[0084] The amount of adhesive overflow required to fill the walls of the column 220 and the mounting hole 110 is M = (cross-sectional area of ​​mounting hole 110 - cross-sectional area of ​​column 220) * (wall thickness of shell body 100 - depth of limiting groove 120) = [(0.945 * 0.910) - (0.65 * 0.650)] * (1 - 0.2) = 0.337mm 3 .

[0085] The amount of adhesive overflow Y of insulating block 400 = volume of insulating block 400 in its natural state * compression amount; as described earlier, the compression amount of insulating block 400 in the deformed state is 35% to 55%; the minimum compression amount Ymin of insulating block 400 = [(2.7*2.6)-(0.945*0.910)]*(0.2+0.2)*35% = 0.862mm 3The above calculations show that when the wall thickness of the shell body 100 is the maximum value of 1.0 mm, M / Y = 0.337 / 0.862 = 39.10%, which is much less than 50%. This ensures that by controlling the distance between the end 210 and the adapter 300 when the pole post 200 is connected to the adapter 300, the first insulating part 411 and the third insulating part 421 of the two insulating blocks 400 in the compressed state can completely fill the gap between the column 220 and the hole wall of the mounting hole 110.

[0086] This application also provides a battery, such as Figure 3 and Figure 4 As shown, in some embodiments, the battery includes an electrode assembly 600 and a housing structure as described above. The electrode assembly 600 has tabs 610 and is disposed within the mounting cavity 130 of the housing body 100. The tabs 610 are connected to the adapter 300. Thanks to the improvements to the housing structure in the above embodiments, the battery of this application embodiment has the same technical effects as the housing structure in the above embodiments, which will not be repeated here.

[0087] The electrode assembly includes a positive electrode, a negative electrode, and a separator, and can be arranged in a manner commonly used in the art, which will not be described in detail in this application.

[0088] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A shell structure, characterized in that, include: The main body of the shell has mounting holes; An adapter, located on the inner side of the housing body, is used to connect to the tabs of the electrode assembly; The pole includes an end and a column. The end is located on the outside of the housing body, and the column is connected to the side of the end facing the housing body. The column passes through the mounting hole and is connected to the adapter, and there is a gap between the column and the wall of the mounting hole. The first insulating block and the second insulating block are both flexible components. The first insulating block includes a first insulating portion and a second insulating portion. The first insulating portion fills the gap, and the second insulating portion is connected to the first insulating portion and disposed between the end and the shell body. The second insulating block includes a third insulating portion and a fourth insulating portion. The third insulating portion fills the gap and abuts against the first insulating portion. The fourth insulating portion is connected to the third insulating portion and disposed between the adapter and the shell body.

2. The shell structure according to claim 1, characterized in that, Both the first insulating block and the second insulating block have a natural state and a deformed state; Both the first insulating block and the second insulating block are ring-shaped when in their natural state. When the first insulating block is in the deformed state, it includes the first insulating part and the second insulating part; when the second insulating block is in the deformed state, it includes the third insulating part and the fourth insulating part. The end of the column away from the end head is connected to the adapter so that the first insulating block and the second insulating block are deformed from the natural state to the deformed state.

3. The shell structure according to claim 2, characterized in that, The first insulating block has a compression ratio of 35% to 55% when it is in the deformed state; and / or, The second insulating block has a compression ratio of 35% to 55% when it is in the deformed state.

4. The shell structure according to claim 2, characterized in that, The projection of the end along the axial direction of the mounting hole onto the second insulating portion does not exceed the edge range of the second insulating portion; and / or, The projection range of the adapter along the axial direction of the mounting hole onto the fourth insulating part does not exceed the edge range of the fourth insulating part.

5. The shell structure according to claim 2, characterized in that, The outer side of the shell body is provided with a limiting groove, which is connected to the mounting hole. When the first insulating block is in the deformed state, the second insulating part is limited to the limiting groove.

6. The shell structure according to claim 5, characterized in that, When the first insulating block is in the deformed state, the thickness of the second insulating part is greater than or equal to the depth of the limiting groove; or, When the first insulating block is in the deformed state, the thickness of the second insulating part is less than the depth of the limiting groove. The first insulating block also includes a fifth insulating part, which fills the space between the side wall of the end and the side wall of the limiting groove.

7. The shell structure according to claim 2, characterized in that, When the first insulating block and the second insulating block are in the natural state, the size of the hollow portion of the first insulating block and the second insulating block is greater than or equal to the size of the column, and the size of the hollow portion is less than or equal to the size of the mounting hole.

8. The shell structure according to claim 1, characterized in that, The shell structure also includes insulating tape, which is sleeved on the outside of the column.

9. The shell structure according to claim 1, characterized in that, The adapter has a groove on one side, the column extends into the groove, and the adapter is connected to at least the bottom wall of the groove; Alternatively, the adapter may have a through hole extending axially along the mounting hole, the column extending into the through hole, and the column being connected to the sidewall of the through hole.

10. A battery, characterized in that, The battery includes: Electrode assembly, with tabs; According to any one of claims 1 to 9, the housing body has a mounting cavity, the electrode assembly is disposed in the mounting cavity, and the electrode tab is connected to the adapter.

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