Housing assembly and battery cell

Abstract

The utility model discloses a shell assembly and a battery monomer, the shell assembly is used for the battery monomer, and the shell assembly comprises a shell body provided with an anti-explosion valve; the end plate is arranged in the shell body and located on one side, facing the anti-explosion valve, of the pole group of the battery monomer, a groove is formed in one side of the end plate in the thickness direction, the groove is opposite to the anti-explosion valve, and a plurality of through holes are formed in the bottom wall of the groove; and the shielding piece is located in the groove and is in interference fit with the groove side wall of the groove, and the projections, facing the shielding piece, of the multiple through holes all fall into the outline of the shielding piece. According to the shell assembly, the explosion-proof valve can be prevented from being damaged easily due to the fact that electrolyte directly impacts on the explosion-proof valve, and reliable connection between the shielding piece and the end plate is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a housing assembly and a battery cell. Background Art

[0002] In the related art, when the battery cell is placed, if the explosion-proof valve is located below the housing assembly, the electrolyte of the battery cell will accumulate at the explosion-proof valve. When the battery cell shakes, the electrolyte will shake back and forth, causing the electrolyte to continuously impact the explosion-proof valve, which is likely to cause damage to the explosion-proof valve and lead to problems such as leakage of the battery cell, and is also likely to cause the explosion-proof valve to open in advance, affecting the normal use of the battery cell. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the utility model is to provide a housing assembly, which can prevent the electrolyte from directly impacting the explosion-proof valve and causing damage to the explosion-proof valve, and ensure reliable connection between the shielding member and the end plate.

[0004] Another object of the utility model is to provide a battery cell having the above housing assembly.

[0005] The housing assembly according to an embodiment of the utility model is used for a battery cell and includes: a housing body, on which an explosion-proof valve is provided; an end plate, which is arranged inside the housing body and on the side of the electrode group of the battery cell facing the explosion-proof valve, a groove is formed on one side in the thickness direction of the end plate, the groove faces the explosion-proof valve, and a plurality of through holes are provided on the bottom wall of the groove; a shielding member, which is located in the groove and is in interference fit with the side wall of the groove, and the projections of the plurality of through holes facing the shielding member all fall within the contour of the shielding member.

[0006] The housing assembly according to an embodiment of the utility model, by arranging the end plate on the side of the electrode group of the battery cell facing the explosion-proof valve, the shielding member is located in the groove of the end plate and is in interference fit with the side wall of the groove, and the projections of the plurality of through holes on the bottom wall of the groove facing the shielding member all fall within the contour of the shielding member, so that the shielding member can block the electrolyte, prevent the electrolyte from directly impacting the explosion-proof valve and causing damage to the explosion-proof valve, ensure the normal use of the battery cell, and the structure of the shielding member is simple and it is fixed reliably in the groove, avoiding the shielding member from coming out of the groove.

[0007] In addition, the housing assembly according to the above embodiment of the utility model may further have the following additional technical features:

[0008] In the housing assembly according to some embodiments of the utility model, convex ribs are provided on the outer peripheral wall of the shielding member, and the convex ribs are in interference fit with the side wall of the groove.

[0009] According to some embodiments of the present utility model, the convex ribs are multiple and are arranged at intervals along the circumferential direction or the thickness direction of the shielding member.

[0010] According to some embodiments of the present utility model, the convex ribs extend along the thickness direction of the shielding member; alternatively, the convex ribs extend along the circumferential direction of the shielding member; alternatively, in the thickness direction of the shielding member, the convex ribs extend obliquely towards one side in the circumferential direction of the shielding member; alternatively, in the thickness direction of the shielding member, the convex ribs extend in a bent manner.

[0011] According to some embodiments of the present utility model, the interference amount between the shielding member and the groove side wall of the groove is 0.05 mm - 0.2 mm.

[0012] According to some embodiments of the present utility model, the distance between the groove bottom wall of the groove and the side of the shielding member facing the through hole is 0.5 mm - 10 mm.

[0013] According to some embodiments of the present utility model, an exhaust groove for exhausting gas is formed on the shielding member.

[0014] According to some embodiments of the present utility model, the shielding member includes a plurality of sub-shielding members, and the plurality of sub-shielding members are arranged at intervals along the length direction and / or the width direction of the end plate, and the projections of the plurality of through holes facing the sub-shielding members fall within the contours of the plurality of sub-shielding members.

[0015] According to some embodiments of the present utility model, the shielding member is an epoxy resin member, a metal member or a plastic member.

[0016] The battery cell according to an embodiment of the present utility model includes the housing assembly according to the embodiment of the present utility model.

[0017] For the battery cell according to an embodiment of the present utility model, the end plate is located on one side of the electrode group of the battery cell facing the explosion-proof valve, the shielding member is located in the groove of the end plate and is in interference fit with the groove side wall of the groove, and the projections of the plurality of through holes on the groove bottom wall facing the shielding member all fall within the contour of the shielding member, so that the shielding member can block the electrolyte, prevent the electrolyte from directly impacting on the explosion-proof valve and easily causing damage to the explosion-proof valve, ensure the normal use of the battery cell, and the structure of the shielding member is simple, and it is fixed reliably in the groove, avoiding the shielding member from coming out of the groove.

[0018] Some additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0020] Figure 1 is a partial cross-sectional view of a battery cell according to an embodiment of the present utility model;

[0021] Figure 2 is an exploded view of an end plate and a shielding member according to an embodiment of the present utility model;

[0022] Figure 3 is a schematic structural view of the cooperation between the end plate and the shielding member according to an embodiment of the present utility model;

[0023] Figure 4 is Figure 3 an enlarged structural view of the circled area A in

[0024] Figure 5 is a left view of the cooperation between the end plate and the shielding member according to an embodiment of the present utility model;

[0025] Figure 6 is Figure 5 a cross-sectional view along the direction shown by the line B-B.

[0026] Reference numerals:

[0027] 100, housing assembly; 200, battery cell;

[0028] 10, housing body; 11, explosion-proof valve;

[0029] 20, end plate; 21, through hole; 22, avoidance portion; 23, flow portion; 221, avoidance hole; 222, body portion; 223, limiting portion; 231, groove;

[0030] 30, shielding member; 31, exhaust groove; 35, rib;

[0031] 40, electrode group;

[0032] 50, insulating member. Detailed implementation manners

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where 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 by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, 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 therefore should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features. The meaning of "a plurality" is two or more. 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 additional features therebetween. The first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0036] The housing assembly 100 according to an embodiment of the present utility model will be described below with reference to the drawings.

[0037] Refer to Figure 1 As shown, the housing assembly 100 according to an embodiment of the present utility model is for a battery cell 200 and may include: a housing body 10 and an end plate 20. Among them, the battery cell 200 may be a blade battery.

[0038] Specifically, an explosion-proof valve 11 is provided on the housing body 10. The end plate 20 is disposed inside the housing body 10, and the end plate 20 is located on the side of the electrode group 40 of the battery cell 200 facing the explosion-proof valve 11 (for example, Figure 1 the left side shown in the figure). The housing body 10 can protect the electrode group 40 to prevent the electrode group 40 from being exposed and damaged. At the same time, the end plate 20 can support and insulate the electrode group 40, meet the support and insulation requirements of the electrode group 40, and can prevent the electrode group 40 from contacting the explosion-proof valve 11 and causing potential safety hazards and other problems, ensuring the safety of the battery cell 200.

[0039] As Figures 2 - 5 shown, one side in the thickness direction of the end plate 20 (for example, Figure 1On the left side shown in the figure, a groove 231 is formed. The groove 231 faces the explosion-proof valve 11. A plurality of (greater than or equal to two) through holes 21 are provided on the bottom wall of the groove 231, so that the plurality of through holes 21 can communicate the electrode group 40 and the explosion-proof valve 11. When the battery cell 200 undergoes thermal runaway, the gas in the housing assembly 100 can smoothly pass through the plurality of through holes 21 and rush out from the explosion-proof valve 11, realizing pressure relief and exhaust, releasing the internal pressure of the battery cell 200, and ensuring the use safety of the battery cell 200.

[0040] In the related art, when the battery cell is placed, if the explosion-proof valve is located below the housing assembly, the electrolyte of the battery cell will accumulate at the explosion-proof valve. When the battery cell shakes, the electrolyte will shake back and forth, causing the electrolyte to continuously impact the explosion-proof valve, easily damaging the explosion-proof valve and resulting in problems such as battery cell leakage, and easily causing the explosion-proof valve to open in advance, affecting the normal use of the battery cell.

[0041] Therefore, in the present utility model, as Figures 2 - 5 shown, the housing assembly 100 further includes a shielding member 30. The shielding member 30 is located in the groove 231, and the shielding member 30 is in interference fit with the side wall of the groove 231. The groove 231 can provide a stable installation space for the shielding member 30, making the shielding member 30 fixed reliably in the groove 231 and preventing the shielding member 30 from disengaging from the groove 231. The structure of the shielding member 30 is simple, facilitating processing and manufacturing, and the projections of the plurality of through holes 21 towards the shielding member 30 all fall within the contour of the shielding member 30. Thus, when the battery cell 200 vibrates, the shielding member 30 can block the electrolyte flowing from the plurality of through holes 21 to the explosion-proof valve 11, preventing the electrolyte from directly impacting the explosion-proof valve 11 and easily damaging the explosion-proof valve 11, thereby avoiding problems such as battery cell 200 leakage and premature opening of the explosion-proof valve 11, and ensuring the normal use of the battery cell 200.

[0042] In an embodiment of the present utility model, the specific structure of the shielding member 30 can be set according to actual conditions. For example, the shielding member 30 can be formed into a square shape, a cross shape, an I shape, a circular shape, a racetrack shape, etc., all of which can achieve the shielding of the through holes 21 and prevent the electrolyte from directly impacting the explosion-proof valve 11 and easily damaging the explosion-proof valve 11.

[0043] In some embodiments, reinforcing ribs are provided in the groove 231. The reinforcing ribs extend along the length direction or the width direction of the end plate 20 (for example Figure 4 the front-back direction shown in the figure), and the structural strength inside the groove 231 can be improved through the reinforcing ribs, avoiding problems such as deformation of the groove 231.

[0044] It should be noted that, for the convenience of description, the orientations such as "front - rear direction", "left - right direction", and "up - down direction" in the present utility model are based on the orientation relationship shown in the drawings, rather than the limitation of the orientation in the actual application process.

[0045] According to the housing assembly 100 of the embodiment of the present utility model, the end plate 20 is located on the side of the electrode group 40 of the battery cell 200 facing the explosion - proof valve 11, the shielding member 30 is located in the groove 231 of the end plate 20 and is in interference fit with the groove side wall of the groove 231. The projections of the multiple through - holes 21 on the groove bottom wall of the groove 231 all fall within the contour of the shielding member 30, so that the shielding member 30 can block the electrolyte, prevent the electrolyte from directly impacting on the explosion - proof valve 11 and easily causing damage to the explosion - proof valve 11, ensure the normal use of the battery cell 200, and the structure of the shielding member 30 is simple, and it is fixed reliably in the groove 231, avoiding the shielding member 30 from coming out of the groove 231.

[0046] In some embodiments of the present utility model, as Figures 4 - 6 shown, the outer peripheral wall of the shielding member 30 is provided with convex ribs 35, and the convex ribs 35 are in interference fit with the groove side wall of the groove 231, so that the shielding member 30 is not easy to fall off or loosen in the groove 231, ensuring that the shielding member 30 is fixed reliably in the groove 231, ensuring the reliable interference fit between the shielding member 30 and the groove side wall of the groove 231, and can reduce the contact area between the shielding member 30 and the groove side wall of the groove 231, facilitating the assembly of the shielding member 30 and being beneficial to improving the assembly efficiency.

[0047] According to some embodiments of the present utility model, as Figure 4 shown in Figure 6 and Figure 2 shown, the convex ribs 35 are multiple (greater than or equal to two), and the multiple convex ribs 35 are arranged at intervals along the circumferential direction or the thickness direction of the shielding member 30 (such as the left - right direction shown in

[0048] In some embodiments, as Figure 4 shown in Figure 6 and

[0049] shown, at least one side of the opposite sides of the shielding member 30 is provided with convex ribs 35, that is, the convex ribs 35 can be arranged on one side of the opposite sides of the shielding member 30, or the convex ribs 35 can be arranged on both opposite sides of the shielding member 30, which can be set according to the actual situation to meet different use requirements. Figure 4As shown, the cross-sectional area of the rib 35 can be formed into a circle, a triangle, a square, or the like.

[0050] In some embodiments of the present invention, as Figure 6 shown, the rib 35 can extend along the thickness direction of the shielding member 30; or the rib 35 can extend along the circumferential direction of the shielding member 30; or, in the thickness direction of the shielding member 30, the rib 35 extends obliquely toward one side in the circumferential direction of the shielding member 30; or, in the thickness direction of the shielding member 30, the rib 35 extends in a bent manner, which can all meet the requirement of the interference fit between the rib 35 and the groove side wall of the groove 231, so as to ensure the interference fit between the shielding member 30 and the groove side wall of the groove 231, make the shielding member 30 fixed reliably in the groove 231, and the structure of the rib 35 is simple, which is convenient for processing and manufacturing, and at the same time, the rib 35 can be set according to the actual situation to meet different usage requirements.

[0051] According to some embodiments of the present invention, as Figure 6 shown, the interference amount between the shielding member 30 and the groove side wall of the groove 231 is 0.05 mm - 0.2 mm, that is, the interference amount between the shielding member 30 and the groove side wall of the groove 231 is t and satisfies 0.05 mm ≤ t ≤ 0.2 mm. Thus, it can ensure that the shielding member 30 is fixed reliably in the groove 231, and avoid problems such as difficult installation or deformation of the shielding member 30 caused by too large an interference amount, which is beneficial to improving the assembly efficiency. For example, in some specific embodiments, the interference amount between the shielding member 30 and the groove side wall of the groove 231 can be 0.05 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, etc.

[0052] In some embodiments, as Figure 2 、 Figure 3 and Figure 5 shown, the end plate 20 includes an avoidance portion 22 and a circulation portion 23. An avoidance hole 221 is provided on the avoidance portion 22, and through the avoidance hole 221, space can be provided for other components (such as tab ears, etc.) inside the battery cell 200 to avoid structural interference.

[0053] In addition, as Figure 2 、 Figure 3 and Figure 5 shown, the circulation portion 23 is connected to one end of the avoidance portion 22 in the length direction (such as Figure 1 the up and down direction shown in Figure 1On the left side shown in [figure], a plurality of through holes 21 are provided on the bottom wall of the groove 231, which can enhance the structural strength at the through holes 21, avoid problems such as damage to the flow-through portion 23, and when thermal runaway occurs in the battery cell 200, the electrolyte flowing out from the plurality of through holes 21 can be guided through the wall of the groove 231, facilitating the flow of the electrolyte towards the explosion-proof valve 11, ensuring reliable exhaust of the battery cell 200, and ensuring the use safety.

[0054] In some embodiments, as Figure 2 , Figure 3 and Figure 5 shown, the avoidance portion 22 includes a main body portion 222 and a limiting portion 223. One end of the main body portion 222 in the length direction (such as Figure 1 the up-and-down direction shown in [figure]) is connected to the flow-through portion 23, which can realize the connection between the avoidance portion 22 and the flow-through portion 23.

[0055] In addition, as Figure 3 and Figure 5 shown, an avoidance hole 221 is provided on the main body portion 222. The avoidance hole 221 extends along the length direction of the main body portion 222. The limiting portion 223 is located in the avoidance hole 221 and extends along the length direction of the main body portion 222. In the direction from the electrode group 40 to the explosion-proof valve 11 (such as Figure 1 the direction from right to left shown in [figure]), the limiting portion 223 extends obliquely towards the direction close to the explosion-proof valve 11. Thus, when other components (such as pole ears) are inserted into the avoidance hole 221, the limiting portion 223 can guide the assembly of other components, facilitating accurate positioning, reducing the assembly difficulty, being beneficial to improving the assembly efficiency, and ensuring reliable limitation of other structures.

[0056] In some embodiments, the included angle between the limiting portion 223 and the arrangement direction of the electrode group 40 and the explosion-proof valve 11 (such as Figure 1 the left-right direction shown in [figure]) is 30° - 85°, which can ensure the limitation of other components by the limiting portion 223 while avoiding the problem of difficult assembly caused by too large an angle, and is convenient for processing and manufacturing the end plate 20, being beneficial to reducing the production cost. For example, in some specific embodiments, the included angle between the limiting portion 223 and the arrangement direction of the electrode group 40 and the explosion-proof valve 11 can be 30°, 40°, 50°, 60°, 70°, 80°, 85°, etc.

[0057] According to some embodiments of the present invention, as Figure 6 shown, the bottom wall of the groove 231 and the side of the shielding member 30 facing the through hole 21 (such as Figure 1The distance between the right side shown in [figure] (the side of the bottom wall of the groove 231 facing the through hole 21 of the shielding member 30) is 0.5 mm - 10 mm, that is, the distance between the bottom wall of the groove 231 and the side of the shielding member 30 facing the through hole 21 is h and satisfies 0.5 mm ≤ h ≤ 10 mm. Thus, when the battery cell 200 undergoes thermal runaway, it is convenient for gas to flow from the through hole 21 to the shielding member 30 and then be discharged from the explosion-proof valve 11, avoiding the shielding member 30 from blocking the exhaust, being able to meet the exhaust requirements of the battery cell 200, and being able to avoid the problem of large occupied space of the housing assembly 100 caused by the long distance between the bottom wall of the groove 231 and the side of the shielding member 30 facing the through hole 21, thereby being able to reduce the occupied space of the battery cell 200. For example, in some specific embodiments, the distance between the bottom wall of the groove 231 and the side of the shielding member 30 facing the through hole 21 can be 0.5 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, etc.

[0058] In some embodiments of the present utility model, as Figures 2 - 5 shown, an exhaust groove 31 is formed on the shielding member 30, and the exhaust groove 31 can exhaust gas. Thus, through the exhaust groove 31, it can be avoided that the shielding member 30 completely blocks the explosion-proof valve 11 and affects the exhaust of the explosion-proof valve 11. When the battery cell 200 undergoes thermal runaway, it ensures reliable exhaust of the battery cell 200 and ensures the use safety.

[0059] According to some embodiments of the present utility model, the shielding member 30 may include a plurality of (greater than or equal to two) sub-shielding members, and the plurality of sub-shielding members are arranged at intervals along the length direction and / or width direction of the end plate 20, that is, the plurality of sub-shielding members may be arranged at intervals along the length direction of the end plate 20 (such as Figure 1 the up and down direction shown in [figure]), or the plurality of sub-shielding members may be arranged at intervals along the width direction of the end plate 20 (such as Figure 1 the front and back direction shown in [figure]), or the plurality of sub-shielding members may be arranged at intervals along the length direction and width direction of the end plate 20, and the projections of the plurality of through holes 21 facing the sub-shielding members fall within the contours of the plurality of sub-shielding members, so that the plurality of shielding members 30 can block the electrolyte, effectively preventing the electrolyte from directly impacting on the explosion-proof valve 11 and easily causing damage to the explosion-proof valve 11, ensuring the normal use of the battery cell 200, and making the setting of the shielding member 30 more flexible and able to meet different use requirements.

[0060] In some embodiments of the present utility model, the shielding member 30 may be an epoxy resin part, a metal part or a plastic part. The epoxy resin part has good insulation and corrosion resistance, the metal part has high strength and stiffness, and the plastic part has the advantages of light weight and low cost, and all can meet the blocking requirements of the shielding member 30 for the electrolyte, and can be selected according to the actual situation to meet different use requirements.

[0061] In some embodiments, the shielding member 30 may be a polypropylene (PP) member. The PP member has high heat resistance and corrosion resistance, which is beneficial to extending the service life of the shielding member 30 and is convenient for processing and forming.

[0062] In some embodiments, the shielding member 30 may be a polyethylene terephthalate (PET) member. The PET member has good heat resistance for stability, which is beneficial to extending the service life of the shielding member 30.

[0063] In some embodiments, the shielding member 30 may be a polyethylene (PE) member. The PE member has good toughness and flexibility, and has good low temperature resistance and stability, which is beneficial to extending the service life of the shielding member 30.

[0064] In some embodiments, as Figure 1 shown, the housing assembly 100 further includes an insulating member 50. The insulating member 50 is disposed between the housing body 10 and the end plate 20. By means of the insulating member 50, the insulation effect between the housing body 10 and the electrode group 40 can be increased, and problems such as short circuit of the battery cell 200 caused by the energization of the housing body 10 can be avoided.

[0065] In addition, the insulating member 50 is provided with a through hole, and the through hole is opposite to the explosion-proof valve 11. The shielding member 30 is located on the side of the through hole away from the explosion-proof valve 11 (for example, Figure 1 the right side shown in). When the battery cell 200 undergoes thermal runaway, the gas in the housing assembly 100 can flow from the through hole to the explosion-proof valve 11 through the through hole 21 and be discharged from the battery cell 200, avoiding the insulating member 50 from blocking the exhaust gas and ensuring the safety of the battery cell 200. For example, the insulating member 50 is a plastic member.

[0066] The battery cell 200 according to an embodiment of the present invention includes the housing assembly 100 according to an embodiment of the present invention. Since the housing assembly 100 according to an embodiment of the present invention has the above-mentioned beneficial technical effects, for the battery cell 200 according to an embodiment of the present invention, through the end plate 20 being located on the side of the electrode group 40 of the battery cell 200 facing the explosion-proof valve 11, the shielding member 30 is located in the groove 231 of the end plate 20 and is in interference fit with the groove side wall of the groove 231, and the projections of the plurality of through holes 21 on the groove bottom wall of the groove 231 all fall within the contour of the shielding member 30, so that the shielding member 30 can block the electrolyte and prevent the electrolyte from directly impacting on the explosion-proof valve 11 and easily causing damage to the explosion-proof valve 11, ensuring the normal use of the battery cell 200, and the structure of the shielding member 30 is simple and is fixed reliably in the groove 231, avoiding the shielding member 30 from coming out of the groove 231.

[0067] The other configurations and operations of the housing assembly 100 and the battery cell 200 according to the embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

[0068] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be construed broadly. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0069] In the description of this specification, the descriptions with reference to the terms "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A housing assembly, characterized in that, For a battery cell, and comprising: A housing body, on which an explosion-proof valve is provided; An end plate, which is arranged inside the housing body and on the side of the electrode group of the battery cell facing the explosion-proof valve. A groove is formed on one side in the thickness direction of the end plate. The groove faces the explosion-proof valve, and a plurality of through holes are provided on the bottom wall of the groove; A shielding member, which is located in the groove and is in interference fit with the side wall of the groove. The projections of the plurality of through holes towards the shielding member all fall within the contour of the shielding member.

2. The housing assembly according to claim 1, wherein, Convex ribs are provided on the outer peripheral wall of the shielding member, and the convex ribs are in interference fit with the side wall of the groove.

3. The housing assembly according to claim 2, wherein The convex ribs are a plurality of spaced apart along the circumferential direction or the thickness direction of the shielding member.

4. The housing assembly according to claim 2, wherein The convex ribs extend along the thickness direction of the shielding member; Or, the convex ribs extend along the circumferential direction of the shielding member; Or, in the thickness direction of the shielding member, the convex ribs extend obliquely towards one side in the circumferential direction of the shielding member; Or, in the thickness direction of the shielding member, the convex ribs extend in a bent manner.

5. The housing assembly according to claim 1, characterized in that The interference amount between the shielding member and the side wall of the groove is 0.05 mm - 0.2 mm.

6. The housing assembly according to claim 1, wherein, The distance between the bottom wall of the groove and the side of the shielding member facing the through holes is 0.5 mm - 10 mm.

7. The housing assembly according to claim 1, wherein, An exhaust groove for exhausting gas is formed on the shielding member.

8. The housing assembly according to claim 1, characterized in that, The shielding member includes a plurality of sub-shielding members, and the plurality of sub-shielding members are spaced apart along the length direction and / or the width direction of the end plate. The projections of the plurality of through holes towards the sub-shielding members fall within the contours of the plurality of sub-shielding members.

9. The housing assembly according to claim 1, wherein The shielding member is an epoxy resin member, a metal member or a plastic member.

10. A battery cell, characterized in that, Comprising a housing assembly according to any one of claims 1-9.

Images