Housing assembly and battery cell having same

Abstract

The utility model discloses a shell assembly and a battery monomer with the shell assembly, the shell assembly is used for accommodating a pole group, the shell assembly comprises a shell body, a cover plate, an insulating end plate and an adhesive tape, the pole group is arranged in the shell body, and openings are formed in the two ends of the shell body in the length direction; the two cover plates cover the two ends, provided with the openings, of the shell body, and at least one cover plate is provided with an anti-explosion valve; the insulating end plate is arranged between the pole group and the cover plate, a first through hole is formed in the insulating end plate, and the first through hole is opposite to the anti-explosion valve; a cavity is formed between the insulating end plate and the cover plate, at least part of the adhesive tape is arranged in the cavity, the adhesive tape is attached to the side, close to the cover plate, of the insulating end plate in the thickness direction, and the adhesive tape corresponds to the first through hole. According to the shell assembly disclosed by the utility model, the shell assembly can better block the shaking of electrolyte, reduce the impact of the electrolyte on the explosion-proof valve and avoid the damage of the explosion-proof valve.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a shell assembly and a battery cell having the same. Background Art

[0002] When the explosion-proof valve on the cover of the blade battery cell is located at the bottom of the battery pack, a cavity is formed between the end plate and the explosion-proof valve inside the battery cell, and the electrolyte will accumulate in the cavity; when the battery cell is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve, causing the explosion-proof valve to be damaged, the battery cell to leak, and the explosion-proof valve to open prematurely. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a housing assembly that can effectively prevent the sloshing of the electrolyte, reduce the electrolyte impact on the explosion-proof valve, and avoid damage to the explosion-proof valve.

[0004] The present utility model also provides a battery cell, which includes the above-mentioned housing assembly.

[0005] According to an embodiment of the present invention, a shell assembly is used to accommodate a pole group. The shell assembly includes a shell body, a cover plate, an insulating end plate and a tape. The pole group is placed in the shell body, and openings are provided at both ends of the shell body in the length direction; the two cover plates are provided on the two ends of the shell body with the openings, and at least one of the cover plates is provided with an explosion-proof valve; the insulating end plate is provided between the pole group and the cover plate, and a first through hole is provided on the insulating end plate, and the first through hole is arranged opposite to the explosion-proof valve; a cavity is formed between the insulating end plate and the cover plate, at least part of the tape is provided in the cavity and the tape is attached to the side of the insulating end plate close to the cover plate in the thickness direction, and the tape is arranged corresponding to the first through hole.

[0006] According to the housing assembly of the embodiment of the present invention, the electrode group is placed in the housing body, two cover plates are provided on both ends of the housing body with openings, an insulating end plate is provided between the electrode group and the cover plates, a first through-hole of the insulating end plate is arranged opposite to the explosion-proof valve on the cover plate, at least a portion of the adhesive tape is provided in the cavity and the adhesive tape is attached to the side of the insulating end plate in the thickness direction close to the cover plate, and the adhesive tape is provided corresponding to the first through-hole. The adhesive tape can block the electrolyte flowing out of the first through-hole, preventing the electrolyte flowing out of the first through-hole from directly impacting the explosion-proof valve, thereby preventing damage to the explosion-proof valve, leakage of battery cells, and premature opening of the explosion-proof valve. A gap is provided between the adhesive tape and the insulating end plate, so that in the event of thermal runaway, gas in the housing assembly can smoothly pass through the gap between the adhesive tape and the insulating end plate and rush out of the explosion-proof valve.

[0007] In some embodiments of the present invention, the thickness of the tape is 25 μm-150 μm.

[0008] In some embodiments of the present invention, a plurality of the first through holes are provided, and the plurality of the first through holes are arranged in multiple rows and columns.

[0009] In some embodiments of the present invention, the adhesive tape is one piece; or, the adhesive tape is multiple pieces, and the multiple pieces of adhesive tape are respectively arranged corresponding to the first through holes.

[0010] In some embodiments of the present invention, a ventilation groove is provided on one side of the insulating end plate close to the explosion-proof valve, and the first through hole is provided at the bottom of the ventilation groove.

[0011] In some embodiments of the present invention, reinforcing ribs are provided in the ventilation groove.

[0012] In some embodiments of the present invention, the shell assembly also includes an insulating part, which is arranged on the side of the cover plate in the thickness direction where the insulating end plate is provided, and the insulating part is arranged between the cover plate and the insulating end plate. The insulating part is provided with an avoidance hole, and the avoidance hole is arranged corresponding to the explosion-proof valve.

[0013] In some embodiments of the present invention, along the thickness direction of the insulating end plate, the surface of the insulating end plate close to the explosion-proof valve is in contact with the insulating member; and / or, the side of the insulating end plate close to the pole group is in contact with the pole group.

[0014] In some embodiments of the present invention, a second through hole is provided on the insulating end plate, a pole ear is provided on the side of the pole group close to the insulating end plate, a pole is provided on the cover plate, and the pole ear and the pole are connected at the second through hole.

[0015] A battery cell according to an embodiment of the present invention includes a pole group and the above-mentioned shell assembly, wherein the pole group is disposed in the shell assembly.

[0016] According to the battery cell of the embodiment of the present invention, the electrode group is placed in the shell body, two cover plates are arranged on the two ends of the shell body with openings, an insulating end plate is arranged between the electrode group and the cover plates, a first through hole of the insulating end plate is arranged opposite to the explosion-proof valve on the cover plate, at least a portion of the adhesive tape is arranged in the cavity and the adhesive tape is attached to the side of the insulating end plate in the thickness direction close to the cover plate, and the adhesive tape is arranged corresponding to the first through hole. The adhesive tape can block the electrolyte flowing out of the first through hole, preventing the electrolyte flowing out of the first through hole from directly impacting the explosion-proof valve, thereby avoiding damage to the explosion-proof valve, and preventing leakage of the battery cell and premature opening of the explosion-proof valve. A gap is provided between the adhesive tape and the insulating end plate, so that in the event of thermal runaway, gas in the shell assembly can smoothly pass through the gap between the adhesive tape and the insulating end plate and rush out of the explosion-proof valve.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a cross-sectional view of a portion of the structure of a battery cell according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 is an exploded view of an insulating end plate and an adhesive tape according to an embodiment of the present invention;

[0022] Figure 4 is a perspective view of an insulating end plate and an adhesive tape according to an embodiment of the present utility model;

[0023] Figure 5 is a top view of an insulating end plate and an adhesive tape according to an embodiment of the present utility model;

[0024] Figure 6 It is a top view of the insulating end plate according to an embodiment of the present utility model.

[0025] Reference numerals:

[0026] 100. Battery cell;

[0027] 10. Shell assembly;

[0028] 1. Shell body; 11. Opening;

[0029] 2. Cover plate; 21. Explosion-proof valve; 22. Pole;

[0030] 3. Insulating end plate; 31. First through hole; 32. Cavity; 33. Ventilation groove; 331. Reinforcement rib; 34. Second through hole; 35. Fourth through hole;

[0031] 4. Adhesive tape;

[0032] 5. Insulation; 51. Avoidance hole;

[0033] 20. Electrode group; 30. Electrolyte. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] Reference below Figures 1-6 An embodiment of a housing assembly 10 according to the present invention is described.

[0038] like Figure 1 As shown, the housing assembly 10 according to an embodiment of the present invention includes a housing body 1 , a cover plate 2 , an insulating end plate 3 and an adhesive tape 4 .

[0039] Specifically, if Figure 1 As shown, the shell assembly 10 is used for the battery cell 100, and the shell assembly 10 is used to accommodate the electrode group 20. The shell assembly 10 can protect the electrode group 20 and prevent the electrode group 20 from being damaged by external impact. The electrode group 20 is placed in the shell body 1. The length direction of the shell body 1 (such as Figure 1 Openings 11 are provided at both ends of the housing (in the direction b shown), and the pole group 20 can enter the interior of the housing body 1 through the openings 11, making the assembly of the pole group 20 more convenient.

[0040] Two cover plates 2 are provided at both ends of the housing 1, where openings 11 are located. The cover plates 2 protect the openings 11, preventing foreign matter from entering the electrode assembly 20 through the openings 11 and damaging it. The cover plates 2 and the housing 1 form a mechanically strong, enclosed space that protects the electrode assembly 20 and prevents damage to the electrode assembly 20 from external impacts. At least one cover plate 2 is provided with an explosion-proof valve 21. This allows high-temperature gases generated by thermal runaway in the electrode assembly 20 to break through the valve and release pressure to the outside, preventing the danger of explosions caused by excessive pressure within the battery cell 100. The valve also promptly reduces the temperature within the battery cell 100, minimizing the risk of thermal runaway from spreading to adjacent cells 100.

[0041] like Figure 1 As shown, the insulating end plate 3 is disposed between the electrode assembly 20 and the cover plate 2 to provide insulation between the electrode assembly 20 and the cover plate 2, preventing current puncture or detachment between the electrode assembly 20 and the cover plate 2, effectively reducing the occurrence of short circuits. A first through-hole 31 is provided on the insulating end plate 3, which is disposed opposite the explosion-proof valve 21. The first through-hole 31 connects the electrode assembly 20 and the explosion-proof valve 21, allowing gas within the housing assembly 10 to pass smoothly through the first through-hole 31 on the insulating end plate 3 and escape through the explosion-proof valve 21 in the event of thermal runaway.

[0042] like Figure 1 and Figure 2 As shown, a cavity 32 is formed between the insulating end plate 3 and the cover plate 2. The electrolyte 30 inside the battery cell 100 will accumulate in the cavity 32. When the battery cell 100 is shaken, the electrolyte 30 will shake back and forth, continuously impacting the explosion-proof valve 21, causing damage to the explosion-proof valve 21, leakage of the battery cell 100, and premature opening of the explosion-proof valve 21.

[0043] In addition, if Figure 6 As shown, the electrolyte 30 enters the interior of the battery cell 100 through the injection hole on the cover plate 2, and a fourth through hole 35 is provided at a position corresponding to the injection hole on the insulating end plate 3. After the electrolyte 30 enters the shell assembly 10 from the injection hole, it enters the position of the electrode group 20 through the fourth through hole 35, making the process of injecting the electrolyte 30 more reliable.

[0044] like Figure 2 and Figure 3 As shown, at least part of the tape 4 is disposed in the cavity 32 and the tape 4 is attached to the thickness direction of the insulating end plate 3 (eg, Figure 1On the side of the cover plate 2 (in the direction a shown in the figure), the tape 4 is arranged corresponding to the first through hole 31. The tape can separate the explosion-proof valve 21 from the cavity 32 on the bottom surface of the insulating end plate 3. The tape 4 can block the electrolyte flowing out of the first through hole 31, preventing the electrolyte flowing out of the first through hole 31 from directly impacting the explosion-proof valve 21. The tape 4 can effectively prevent the swaying of the electrolyte 30, reduce the impact of the electrolyte 30 on the explosion-proof valve 21, avoid damage to the explosion-proof valve 21, prevent leakage of the battery cell 100, and prevent the explosion-proof valve 21 from opening prematurely. There is also a gap between the tape 4 and the insulating end plate 3, so that in the event of thermal runaway, the gas in the housing assembly 10 can smoothly pass through the gap between the tape 4 and the insulating end plate 3 and rush out of the explosion-proof valve 21.

[0045] According to the housing assembly 10 of the present invention, the electrode group 20 is placed within the housing body 1, two cover plates 2 are provided at both ends of the housing body 1 having an opening 11, an insulating end plate 3 is provided between the electrode group 20 and the cover plate 2, a first through hole 31 of the insulating end plate 3 is arranged opposite the explosion-proof valve 21 on the cover plate 2, at least a portion of the adhesive tape 4 is provided within the cavity 32, and the adhesive tape 4 is attached to the side of the insulating end plate 3 in the thickness direction near the cover plate 2. The adhesive tape 4 is provided corresponding to the first through hole 31. The adhesive tape 4 can block the electrolyte flowing out of the first through hole 31, preventing the electrolyte flowing out of the first through hole 31 from directly impacting the explosion-proof valve 21, thereby preventing damage to the explosion-proof valve 21, preventing leakage of the battery cell 100, and preventing premature opening of the explosion-proof valve 21. A gap is provided between the adhesive tape 4 and the insulating end plate 3, so that in the event of thermal runaway, gas within the housing assembly 10 can smoothly pass through the gap between the adhesive tape 4 and the insulating end plate 3 and rush out of the explosion-proof valve 21.

[0046] In this embodiment, the material of the tape 4 can be PEI\PI\PP\PE, etc. Preferably, the material of the tape 4 is PET. PET plastic has high heat resistance and can maintain stable performance under a certain high temperature environment.

[0047] In some embodiments of the present invention, the thickness of the adhesive tape 4 is 25 μm-150 μm. It is understood that the thickness of the adhesive tape 4 can be 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm or 150 μm. The thickness of the tape 4 is not less than 25 μm, which can ensure the strength of the tape 4 and prevent the tape 4 from breaking when subjected to electrolyte impact; the thickness of the tape 4 is not greater than 150 μm, which can prevent the thickness of the tape 4 from being too large and prevent the tape 4 from occupying too much space inside the shell assembly 10.

[0048] In some embodiments of the present invention, Figure 3 and Figure 6 As shown, a plurality of first through holes 31 are provided, and the plurality of first through holes 31 are arranged in multiple rows and columns. Exemplarily, the first through holes 31 are provided in a waist shape, and there are sixteen of them, and the sixteen waist-shaped first through holes 31 are arranged in a 4×4 matrix, and the layout of the plurality of first through holes 31 is relatively regular.

[0049] In some embodiments of the present invention, the tape 4 is a single strip, and there is a gap between the tape 4 and the edge of the insulating end plate 3, so that when thermal runaway occurs, the gas in the shell assembly 10 can smoothly pass through the gap between the tape 4 and the edge of the insulating end plate 3 and rush out from the explosion-proof valve 21, thereby increasing thermal safety.

[0050] In some embodiments of the present invention, Figure 3-Figure 5 As shown, there are multiple tapes 4, and the multiple tapes 4 are respectively arranged corresponding to the first through holes 31. There are gaps between the tapes 4 and the edges of the insulating end plates 3 and between two adjacent tapes 4, so that when thermal runaway occurs, the gas in the shell assembly 10 can smoothly pass through the gaps between the tapes 4 and the edges of the insulating end plates 3 and between two adjacent tapes 4, and rush out from the explosion-proof valve 21, thereby increasing thermal safety.

[0051] In some embodiments of the present invention, Figure 3 As shown, a vent groove 33 is provided on one side of the insulating end plate 3 near the explosion-proof valve 21, and a first through hole 31 is provided at the bottom of the vent groove 33. During thermal runaway, the gas within the housing assembly 10 can first pass through the first through hole 31 of the insulating end plate 3, then enter the vent groove 33, and then pass through the gap between the adhesive tape 4 and the edge of the insulating end plate 3 and between two adjacent adhesive tapes 4, finally breaking through the explosion-proof valve 21 and discharging the battery cell 100. The adhesive tape can also block some of the electrolyte 30 that enters the vent groove 33, thereby preventing damage to the explosion-proof valve 21, preventing leakage of the battery cell 100, and preventing premature opening of the explosion-proof valve 21.

[0052] Furthermore, if Figure 4 and Figure 6 As shown, a reinforcing rib 331 is provided in the ventilation groove 33. For example, there is one reinforcing rib 331, which is placed in the middle of the first through holes 31 arranged in a 4×4 matrix, ensuring the strength of the ventilation groove 33 without affecting the ventilation of the first through holes 31.

[0053] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the housing assembly 10 further includes an insulating member 5, which is disposed on the side of the cover plate 2 in the thickness direction where the insulating end plate 3 is disposed. The insulating member 5 is disposed between the cover plate 2 and the insulating end plate 3. The insulating member 5 can enhance the insulation effect between the cover plate 2 and the electrode group 20, thereby preventing the cover plate 2 from being energized and thus preventing the battery cell 100 from short-circuiting. A relief hole 51 is provided on the insulating member 5, which is disposed correspondingly to the explosion-proof valve 21. In the event of thermal runaway, the gas within the housing assembly 10 can first pass through the first through hole 31 of the insulating end plate 3, then enter the vent groove 33, and then pass through the gap between the tape 4 and the edge of the insulating end plate 3 and between two adjacent tapes 4, and finally pass through the relief hole 51 on the insulating member 5, finally breaking through the explosion-proof valve 21 and discharging the battery cell 100, thereby increasing the thermal safety of the battery cell 100.

[0054] In some embodiments of the present invention, along the thickness direction of the insulating end plate 3, the surface of the insulating end plate 3 close to the explosion-proof valve 21 is in contact with the insulating member 5. When the battery cell 100 is assembled, the insulating member 5 can squeeze the insulating end plate 3, thereby increasing the reliability of the position of the insulating end plate 3.

[0055] In some embodiments of the present invention, along the thickness direction of the insulating end plate 3, the side of the insulating end plate 3 close to the pole group 20 is in contact with the pole group 20. When thermal runaway occurs, the gas in the shell assembly 10 can first pass through the first through hole 31 of the insulating end plate 3 more smoothly, so that the thermal runaway gas enters the vent groove 33, and then passes through the gap between the tape 4 and the edge of the insulating end plate 3 and between two adjacent tapes 4, and finally passes through the avoidance hole 51 on the insulating part 5, and finally breaks through the explosion-proof valve 21 to be discharged from the battery cell 100, thereby increasing the thermal safety of the battery cell 100.

[0056] In some embodiments of the present invention, the insulating end plate 3 is a plastic part. The insulating end plate 3 has good insulation properties, and the plastic part can be processed by injection molding or other methods. The manufacturing process of the insulating end plate 3 is relatively simple.

[0057] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the insulating end plate 3 is provided with a second through hole 34, the electrode group 20 is provided with a tab on the side near the insulating end plate 3, and the cover plate 2 is provided with a terminal post 22. The tab and the terminal post 22 are connected at the second through hole 34. This not only ensures electrical continuity between the electrode group 20 and the terminal post 22 on the cover plate 2, but also prevents puncture or detachment between the electrode group 20 and the cover plate 2, ensuring the normal use and service life of the battery cell 100.

[0058] According to an embodiment of the present invention, the battery cell 100 includes a pole group 20 and a housing assembly 10 , wherein the pole group 20 is disposed in the housing assembly 10 .

[0059] Specifically, the battery cell 100 also includes side plates and bare cell insulating sheets, which are welded and fixed and then wrapped around the outside of the electrode group 20; in addition, the bare cell insulating sheet and the insulating part 5 and other plastic parts on the cover plate 2 are melted and fixed, so that the electrode group 20 is well fixed in the shell assembly 10 to prevent the electrode group 20 from short-circuiting.

[0060] According to the battery cell 100 of the present invention, the electrode group 20 is placed within the shell body 1, two cover plates 2 are provided at both ends of the shell body 1 having an opening 11, an insulating end plate 3 is provided between the electrode group 20 and the cover plate 2, a first through hole 31 of the insulating end plate 3 is arranged opposite the explosion-proof valve 21 on the cover plate 2, at least a portion of the adhesive tape 4 is provided within the cavity 32, and the adhesive tape 4 is attached to the side of the insulating end plate 3 in the thickness direction near the cover plate 2. The adhesive tape 4 is provided corresponding to the first through hole 31. The adhesive tape 4 can block the electrolyte flowing out of the first through hole 31, preventing the electrolyte flowing out of the first through hole 31 from directly impacting the explosion-proof valve 21, thereby preventing damage to the explosion-proof valve 21, and preventing leakage of the battery cell 100 and premature opening of the explosion-proof valve 21. A gap is provided between the adhesive tape 4 and the insulating end plate 3, allowing gas within the shell assembly 10 to smoothly pass through the gap between the adhesive tape 4 and the insulating end plate 3 and escape through the explosion-proof valve 21 during thermal runaway.

[0061] Other structures and operations of the housing assembly 10 and the battery cell 100 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0062] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does 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 any one or more embodiments or examples.

[0063] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A housing assembly for accommodating a pole group, characterized in that: include: A shell body, wherein the electrode group is placed in the shell body, and openings are provided at both ends of the shell body in the longitudinal direction; Cover plates, two of which are provided on both ends of the shell body where the opening is provided, and at least one of which is provided with an explosion-proof valve; an insulating end plate, the insulating end plate being disposed between the pole group and the cover plate, the insulating end plate being provided with a first through hole, the first through hole being disposed opposite to the explosion-proof valve; The adhesive tape forms a cavity between the insulating end plate and the cover plate, at least a portion of the adhesive tape is disposed in the cavity and the adhesive tape is attached to a side of the insulating end plate close to the cover plate in the thickness direction, and the adhesive tape is disposed corresponding to the first through hole.

2. The housing assembly according to claim 1, wherein: The thickness of the adhesive tape is 25 μm-150 μm.

3. The housing assembly according to claim 1, wherein: A plurality of the first through holes are provided, and the plurality of the first through holes are arranged in multiple rows and columns.

4. The housing assembly according to claim 1, wherein: The adhesive tape is one piece; Alternatively, there are multiple strips of adhesive tape, and the multiple strips of adhesive tape are respectively arranged corresponding to the first through holes.

5. The housing assembly according to claim 1, wherein: A ventilation groove is provided on one side of the insulating end plate close to the explosion-proof valve, and the first through hole is provided at the bottom of the ventilation groove.

6. The housing assembly according to claim 5, wherein: Reinforcing ribs are arranged in the ventilation groove.

7. The housing assembly according to claim 1, wherein: The housing assembly further comprises: An insulating member is provided on a side of the cover plate in a thickness direction where the insulating end plate is provided, the insulating member is provided between the cover plate and the insulating end plate, and an avoidance hole is provided on the insulating member, and the avoidance hole is provided corresponding to the explosion-proof valve.

8. The housing assembly according to claim 7, wherein: Along the thickness direction of the insulating end plate, The surface of the insulating end plate close to the explosion-proof valve is in contact with the insulating member; And / or, a side of the insulating end plate close to the pole group is in contact with the pole group.

9. The housing assembly according to claim 1, wherein: A second through hole is provided on the insulating end plate, a pole lug is provided on one side of the pole group close to the insulating end plate, a pole post is provided on the cover plate, and the pole lug and the pole post are connected at the second through hole.

10. A battery cell, characterized in that: include: Pole group; According to the shell assembly according to any one of claims 1 to 9, the pole group is arranged in the shell assembly.

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