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 a baffle plate, 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 in the side, facing the cover plate, of the insulating end plate, the baffle is arranged in the cavity, the baffle is connected with the bottom wall of the cavity through a fastener, and the baffle corresponds to the first through hole. According to the shell assembly provided 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, and the connection between the baffle and the insulating end plate is simpler and more reliable.

Description

Technical Field

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

[0002] When the explosion-proof valve on the cover plate 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 in the battery cell, and the electrolyte will accumulate in the cavity; when the battery cell is shaken, the electrolyte will slosh back and forth, continuously impacting the explosion-proof valve, causing damage to the explosion-proof valve and leakage of the battery cell, and premature opening of the explosion-proof valve. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a housing assembly, which can preferably block the sloshing of the electrolyte, reduce the impact of the electrolyte on the explosion-proof valve, avoid damage to the explosion-proof valve, and the baffle is connected to the bottom wall of the cavity through fasteners, and the connection between the baffle and the insulating end plate is relatively simple and reliable.

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

[0005] The housing assembly according to an embodiment of the utility model is used to accommodate a pole group. The housing assembly includes a housing body, a cover plate, an insulating end plate and a baffle. The pole group is placed in the housing body, and both ends of the housing body in the length direction are provided with openings; two cover plates are covered on both ends of the housing body provided with the openings, and at least one cover plate is provided with an explosion-proof valve; the insulating end plate is arranged between the pole group and the cover plate, and a first through hole is arranged on the insulating end plate, and the first through hole is arranged opposite to the explosion-proof valve; a cavity is formed on the side of the insulating end plate facing the cover plate, the baffle is arranged in the cavity, the baffle is connected to the bottom wall of the cavity through fasteners, and the baffle is arranged corresponding to the first through hole.

[0006] The housing assembly according to an embodiment of the utility model places the pole group in the housing body, covers two cover plates on both ends of the housing body provided with openings, arranges the insulating end plate between the pole group and the cover plate, makes the first through hole of the insulating end plate arranged opposite to the explosion-proof valve on the cover plate, forms a cavity on the side of the insulating end plate facing the cover plate, arranges the baffle in the cavity, the baffle can block the electrolyte flowing out from the first through hole, avoid the electrolyte flowing out from the first through hole directly impacting the explosion-proof valve, the baffle can preferably block the sloshing of the electrolyte, reduce the impact of the electrolyte on the explosion-proof valve, avoid damage to the explosion-proof valve, avoid leakage of the battery cell and premature opening of the explosion-proof valve. And the baffle is connected to the bottom wall of the cavity through fasteners, and the connection between the baffle and the insulating end plate is relatively simple and reliable.

[0007] In some embodiments of the present utility model, there is a gap between the baffle and the peripheral wall of the cavity.

[0008] In some embodiments of the present utility model, the bottom wall of the cavity is provided with a protrusion, and the baffle abuts against the free end surface of the protrusion.

[0009] In some embodiments of the present utility model, along the thickness direction of the insulating end plate, the distance H1 between the free end surface of the protrusion and the bottom wall of the cavity is not less than 1 mm; and / or, along the thickness direction of the insulating end plate, the distance H2 between the end surface of the baffle away from the protrusion and the open mouth of the cavity is not less than 0.

[0010] In some embodiments of the present utility model, a plurality of first through holes are provided, and the plurality of first through holes are arranged in multiple rows and multiple columns.

[0011] In some embodiments of the present utility model, the baffle is a metal part; or, the baffle is a plastic part; or, the baffle is a resin part.

[0012] In some embodiments of the present utility model, the housing assembly further includes an insulating part, the insulating part is arranged on the side of the cover plate where the insulating end plate is provided in the thickness direction, the insulating part is arranged between the cover plate and the insulating end plate, and 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 utility model, along the thickness direction of the insulating end plate, the surface of the insulating end plate close to the explosion-proof valve is attached to the insulating part; and / or, the side of the insulating end plate close to the electrode group is attached to the electrode group.

[0014] In some embodiments of the present utility model, the insulating end plate is provided with a second through hole, one side of the electrode group close to the insulating end plate is provided with a tab, the cover plate is provided with a terminal post, and the tab and the terminal post are connected at the second through hole.

[0015] The battery cell according to the embodiment of the present utility model includes an electrode group and the above-mentioned housing assembly, and the electrode group is arranged in the housing assembly.

[0016] According to the battery cell of the embodiment of the present utility model, by placing the electrode group in the housing body, two cover plates are covered on both ends of the housing body provided with openings, an insulating end plate is arranged between the electrode group and the cover plate, the first through hole of the insulating end plate is arranged opposite to the explosion-proof valve on the cover plate, a cavity is formed on the side of the insulating end plate facing the cover plate, a baffle is arranged in the cavity, the baffle can block the electrolyte flowing out from the first through hole, avoid the electrolyte flowing out from the first through hole directly impacting the explosion-proof valve, the baffle can better block the shaking of the electrolyte, reduce the impact of the electrolyte on the explosion-proof valve, avoid damage to the explosion-proof valve, and avoid liquid leakage of the battery cell and premature opening of the explosion-proof valve. And the baffle is connected to the bottom wall of the cavity through fasteners, and the connection between the baffle and the insulating end plate is relatively simple and reliable.

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

[0018] The above and / or additional aspects and advantages of the present utility model will become apparent and be 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 partial structure of a battery cell according to an embodiment of the present utility model;

[0020] Figure 2 is Figure 1 an enlarged view of part A in

[0021] Figure 3 is an exploded view of an insulating end plate and a baffle according to an embodiment of the present utility model;

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

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

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

[0025] Figure 7 is a cross-sectional view of an insulating end plate and a baffle according to an embodiment of the present utility model.

[0026] REFERENCE SIGNS:

[0027] 100, battery cell;

[0028] 10, housing assembly;

[0029] 1, housing body; 11, opening;

[0030] 2. Cover plate; 21. Explosion-proof valve; 22. Terminal post

[0031] 3. Insulating end plate; 31. First through hole; 32. Cavity; 33. Venting groove; 34. Second through hole; 35. Fourth through hole; 36. Protrusion

[0032] 4. Baffle plate

[0033] 5. Insulating part; 51. Avoidance hole

[0034] 6. Fastener

[0035] 20. Electrode group; 30. Electrolyte Detailed implementation manners

[0036] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the 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 with reference to the 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.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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 thus should not be construed as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. 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 directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] Next, refer to Figures 1 - 7 to describe the housing assembly 10 according to the embodiments of the present utility model.

[0040] As Figure 1 shown, the housing assembly 10 according to an embodiment of the present utility model includes a housing body 1, a cover plate 2, an insulating end plate 3, and a baffle 4.

[0041] Specifically, as Figure 1 shown, the housing assembly 10 is for a battery cell 100. The housing assembly 10 is used to accommodate the electrode group 20, and the housing assembly 10 can protect the electrode group 20 from being damaged by external impacts. The electrode group 20 is placed inside the housing body 1. Openings 11 are provided at both ends of the housing body 1 in the length direction (such as the a direction shown Figure 1 ). The electrode group 20 can enter the inside of the housing body 1 through the openings 11, making the assembly of the electrode group 20 more convenient.

[0042] Two cover plates 2 are covered on both ends of the housing body 1 where the openings 11 are provided. The cover plates 2 can protect the openings 11, prevent foreign objects from entering the electrode group 20 through the openings 11, and prevent foreign objects from damaging the electrode group 20. The cover plates 2 and the housing body 1 form a closed space with a certain mechanical strength to protect the electrode group 20 from being damaged by external impacts. At least one cover plate 2 is provided with an explosion-proof valve 21, so that the high-temperature gas generated when the electrode group 20 has a thermal runaway can break through the explosion-proof valve 21 and release pressure to the outside, avoiding dangers such as explosion caused by excessive air pressure inside the battery cell 100, and can also reduce the temperature inside the battery cell 100 in time, and try to prevent the thermal runaway of the battery cell 100 from spreading to adjacent battery cells 100.

[0043] As Figure 1 shown, the insulating end plate 3 is provided between the electrode group 20 and the cover plate 2 to achieve insulation between the electrode group 20 and the cover plate 2, prevent current piercing or falling off between the electrode group 20 and the cover plate 2, and effectively reduce the occurrence of short circuits. A first through hole 31 is provided on the insulating end plate 3, and the first through hole 31 is arranged opposite to the explosion-proof valve 21. The first through hole 31 can communicate the electrode group 20 and the explosion-proof valve 21, so that the gas in the housing assembly 10 during thermal runaway can smoothly pass through the first through hole 31 on the insulating end plate 3 and rush out from the explosion-proof valve 21.

[0044] As Figure 1 and Figure 2 shown, a cavity is formed on the side of the insulating end plate 3 facing the cover plate 2. The electrolyte 30 inside the battery cell 100 will gather 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.

[0045] In addition, as Figure 6As shown, the electrolyte 30 enters the interior of the battery cell 100 through the liquid injection hole on the cover plate 2. A fourth through-hole 35 is provided at the position of the insulating end plate 3 corresponding to the liquid injection hole. The electrolyte 30 enters the housing assembly 10 through the liquid injection hole and then enters the position where the electrode group 20 is located through the fourth through-hole 35, making the process of injecting the electrolyte 30 more reliable.

[0046] As Figure 2 , Figure 3 and Figure 7 As shown, the baffle 4 is arranged in the cavity 32. The baffle 4 is connected to the bottom wall of the cavity 32 through a fastener 6. The connection between the baffle 4 and the insulating end plate 3 is relatively simple and reliable. The baffle 4 is arranged corresponding to the first through-hole 31. The baffle 4 can block the electrolyte flowing out from the first through-hole 31, avoiding the electrolyte flowing out from the first through-hole 31 directly impacting the explosion-proof valve 21. The baffle 4 can preferably block the shaking 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, and prevent the battery cell 100 from leaking liquid and the explosion-proof valve 21 from opening in advance.

[0047] According to the housing assembly 10 of the present utility model embodiment, by placing the electrode group 20 in the housing body 1, two cover plates 2 are covered on both ends of the housing body 1 provided with an opening 11, the insulating end plate 3 is arranged between the electrode group 20 and the cover plate 2, the first through-hole 31 of the insulating end plate 3 is arranged opposite to the explosion-proof valve 21 on the cover plate 2, a cavity 32 is formed on the side of the insulating end plate 3 facing the cover plate 2, the baffle 4 is arranged in the cavity 32, the baffle 4 can block the electrolyte flowing out from the first through-hole 31, avoiding the electrolyte flowing out from the first through-hole 31 directly impacting the explosion-proof valve 21. The baffle 4 can preferably block the shaking 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, and prevent the battery cell 100 from leaking liquid and the explosion-proof valve 21 from opening in advance. And the baffle 4 is connected to the bottom wall of the cavity 32 through a fastener 6, and the connection between the baffle 4 and the insulating end plate 3 is relatively simple and reliable.

[0048] In this embodiment, the fastener 6 can be a metal part or a non-metal part, and the material of the fastener 6 can be selected according to requirements, increasing the adaptability of the fastener 6.

[0049] In some embodiments of the present utility model, as Figure 1 and Figure 4 As shown, there is a gap between the baffle 4 and the peripheral wall of the cavity 32, enabling the gas in the housing assembly 10 during thermal runaway to smoothly pass through the gap between the baffle 4 and the peripheral wall of the cavity 32 and rush out from the explosion-proof valve 21, increasing the thermal safety of the battery cell 100.

[0050] In some embodiments of the present utility model, a protrusion 36 is provided on the bottom wall of the cavity 32, and the baffle 4 abuts against the free end face of the protrusion 36, so as to prevent the baffle 4 from fitting against the bottom wall of the cavity 32. When thermal runaway occurs, the gas in the housing assembly 10 can smoothly pass through the gap between the baffle 4 and the bottom wall of the cavity 32 and rush out from the explosion-proof valve 21, thereby increasing the thermal safety of the battery cell 100.

[0051] In some embodiments of the present utility model, along the thickness direction of the insulating end plate 3 (such as Figure 1 the a direction shown), the distance H1 between the free end face of the protrusion 36 and the bottom wall of the cavity 32 is not less than 1 mm. It can be understood that the distance H1 between the free end face of the protrusion 36 and the bottom wall of the cavity 32 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc., which can ensure that there is a certain gap between the free end face of the protrusion 36 and the bottom wall of the cavity 32, facilitating the gas in the housing assembly 10 to smoothly pass through the gap between the baffle 4 and the bottom wall of the cavity 32 and rush out from the explosion-proof valve 21, thereby increasing the thermal safety of the battery cell 100.

[0052] In some embodiments of the present utility model, along the thickness direction of the insulating end plate 3, the distance H2 between the end face of the baffle 4 away from the protrusion 36 and the open mouth of the cavity 32 is not less than 0. It can be understood that the distance H2 between the end face of the baffle 4 away from the protrusion 36 and the open mouth of the cavity 32 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc., which can prevent the baffle 4 from protruding from the open mouth of the insulating end plate 3 and avoid affecting the assembly of the insulating end plate 3 with other components.

[0053] In some embodiments of the present utility model, as Figure 3 and Figure 6 shown, a plurality of first through holes 31 are provided, and the plurality of first through holes 31 are arranged in multiple rows and multiple columns. Exemplarily, the first through holes 31 are set to be waist-shaped, and there are sixteen of them. 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.

[0054] In some embodiments of the present utility model, the baffle 4 may be provided with a plurality of third through-holes, and the plurality of third through-holes are spaced apart. Exemplarily, the third through-holes are provided in a kidney shape, and there are sixteen of them. The sixteen kidney-shaped third through-holes are arranged in a 2×8 matrix, and the layout of the plurality of third through-holes is relatively regular.

[0055] In some embodiments of the present utility model, the baffle 4 is a metal part; or, the baffle 4 is a plastic part; or, the baffle 4 is a resin part. The material of the baffle 4 can be selected according to requirements to increase the adaptability of the baffle 4.

[0056] For example, the baffle 4 is made of materials such as PP, PET, PE, etc. in metal parts, and can be selected according to requirements.

[0057] In some embodiments of the present utility model, as Figure 3 shown, a ventilation groove 33 is provided on one side of the insulating end plate 3 close to the explosion-proof valve 21, and the first through-hole 31 is provided at the bottom of the ventilation groove 33. When thermal runaway occurs, the gas in the housing assembly 10 can first pass through the first through-hole 31 of the insulating end plate 3, then enter the ventilation groove 33, and finally break through the explosion-proof valve 21 and discharge from the battery cell 100. Moreover, the baffle 4 can block part of the electrolyte 30 entering the ventilation groove 33, avoiding damage to the explosion-proof valve 21 and preventing the battery cell 100 from leaking liquid and the explosion-proof valve 21 from opening in advance.

[0058] Furthermore, a reinforcing rib is provided in the ventilation groove 33. Exemplarily, there is one reinforcing rib, 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.

[0059] In some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the housing assembly 10 further includes an insulating member 5. The insulating member 5 is provided on one side of the cover plate 2 in the thickness direction where the insulating end plate 3 is located. The insulating member 5 is provided between the cover plate 2 and the insulating end plate 3. The insulating member 5 can increase the insulation effect between the cover plate 2 and the electrode group 20, avoiding the cover plate 2 from being electrified and preventing the battery cell 100 from being short-circuited. An avoidance hole 51 is provided on the insulating member 5, and the avoidance hole 51 is correspondingly arranged with the explosion-proof valve 21. When thermal runaway occurs, the gas in the housing assembly 10 can first pass through the first through-hole 31 of the insulating end plate 3, then enter the ventilation groove 33, pass through the avoidance hole 51 on the insulating member 5, and finally break through the explosion-proof valve 21 and discharge from the battery cell 100, increasing the thermal safety of the battery cell 100.

[0060] In some embodiments of the present utility model, 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 attached to the insulating member 5. When the battery cell 100 is assembled, the insulating member 5 can extrude the insulating end plate 3, which can increase the reliability of the positions of the insulating end plate 3 and the baffle 4.

[0061] In some embodiments of the present utility model, along the thickness direction of the insulating end plate 3, one side of the insulating end plate 3 close to the electrode group 20 is attached to the electrode group 20. When thermal runaway occurs, the gas in the housing assembly 10 can smoothly pass through the first through hole 31 of the insulating end plate 3 first, so that the thermal runaway gas can enter the ventilation groove 33, then pass through the avoidance hole 51 on the insulating member 5, and finally break through the explosion-proof valve 21 and discharge from the battery cell 100, increasing the thermal safety of the battery cell 100.

[0062] In some embodiments of the present utility model, the insulating end plate 3 is a plastic part, the insulating end plate 3 has good insulation, and the plastic part can be processed by injection molding and other methods, and the manufacturing process of the insulating end plate 3 is relatively simple.

[0063] In some embodiments of the present utility model, as Figure 4 and Figure 5 shown, the insulating end plate 3 is provided with a second through hole 34, one side of the electrode group 20 close to the insulating end plate 3 is provided with a tab, and the cover plate 2 is provided with a terminal 22. The tab and the terminal 22 are connected at the second through hole 34. It not only realizes the conduction of connecting the electrode group 20 and the terminal 22 on the cover plate 2, but also can avoid the piercing or falling off phenomenon between the electrode group 20 and the cover plate 2, ensuring the normal use and service life of the battery cell 100.

[0064] The battery cell 100 according to the embodiment of the present utility model includes an electrode group 20 and a housing assembly 10, and the electrode group 20 is arranged in the housing assembly 10.

[0065] Specifically, the battery cell 100 further includes a side plate and a bare cell insulating sheet. After the side plate and the bare cell insulating sheet are welded and fixed, they are wrapped outside the electrode group 20; in addition, the bare cell insulating sheet and plastic parts such as the insulating member 5 on the cover plate 2 are melt-fixed, so that the electrode group 20 is well fixed in the housing assembly 10, avoiding short circuit of the electrode group 20.

[0066] According to the battery cell 100 of an embodiment of the present utility model, by placing the electrode group 20 in the housing body 1, two cover plates 2 are covered on both ends of the housing body 1 provided with an opening 11, an insulating end plate 3 is arranged between the electrode group 20 and the cover plate 2, a first through hole 31 of the insulating end plate 3 is arranged opposite to the explosion-proof valve 21 on the cover plate 2, a cavity 32 is formed on the side of the insulating end plate 3 facing the cover plate 2, a baffle 4 is arranged in the cavity 32, the baffle 4 can block the electrolyte flowing out from the first through hole 31, avoid the electrolyte flowing out from the first through hole 31 directly impacting the explosion-proof valve 21, the baffle 4 can preferably block the shaking 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, and avoid liquid leakage of the battery cell 100 and premature opening of the explosion-proof valve 21. Moreover, the baffle 4 and the bottom wall of the cavity 32 are connected by fasteners, and the connection between the baffle 4 and the insulating end plate 3 is relatively simple and reliable.

[0067] The other constitutions and operations of the housing assembly 10 and the battery cell 100 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 here.

[0068] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0069] 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 purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A housing assembly for accommodating a pole group, characterized in that, Comprising: A shell body, within which the electrode group is disposed, and openings are provided at both ends of the shell body in the length direction; Cover plates, two of the cover plates are covered on both ends of the shell body where the openings are provided, and at least one of the cover plates is provided with an explosion-proof valve; Insulating end plates, the insulating end plates are disposed between the electrode group and the cover plates, and first through holes are provided on the insulating end plates, and the first through holes are disposed opposite to the explosion-proof valves; A baffle plate, a cavity is formed on the side of the insulating end plate facing the cover plate, the baffle plate is disposed within the cavity, the baffle plate and the bottom wall of the cavity are connected by fasteners, and the baffle plate is disposed corresponding to the first through hole.

2. The housing assembly according to claim 1, characterized in that, There is a gap between the baffle plate and the peripheral wall of the cavity.

3. The housing assembly according to claim 1, wherein, The bottom wall of the cavity is provided with a protrusion, and the baffle plate abuts against the free end surface of the protrusion.

4. The housing assembly according to claim 3, wherein, In the thickness direction of the insulating end plate, the distance H1 between the free end surface of the protrusion and the bottom wall of the cavity is not less than 1 mm; And / or, in the thickness direction of the insulating end plate, the distance H2 between the end surface of the baffle plate away from the protrusion and the open end of the cavity is not less than 0.

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

6. The housing assembly according to claim 1, characterized in that, The baffle plate is a metal part; Or, the baffle plate is a plastic part; Or, the baffle plate is a resin part.

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

8. The housing assembly according to claim 7, characterized in that, In 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 part; And / or, the side of the insulating end plate close to the electrode group is in contact with the electrode group.

9. The housing assembly according to claim 1, wherein Second through holes are provided on the insulating end plates, electrode tabs are provided on the side of the electrode group close to the insulating end plates, and electrode posts are provided on the cover plates, and the electrode tabs and the electrode posts are connected at the second through holes.

10. A battery cell, characterized in that, Comprising: An electrode group; The housing assembly according to any one of claims 1-9, wherein the electrode group is disposed within the housing assembly.

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