Shell assembly and battery cell

Abstract

The utility model discloses a shell assembly and a battery monomer, the shell assembly comprises a shell body, a shell cover, a shell cover and a shell cover, the shell body is provided with an anti-explosion valve of the battery monomer; the end plate is arranged in the shell body and is positioned on one side, facing the anti-explosion valve, of the pole group of the single battery, a groove is formed in one side of the end plate in the thickness direction, an opening of 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 covers the opening and is connected with the end plate in a bonding mode, 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 disclosed by the utility model, the shielding piece can block the electrolyte, so that the electrolyte is prevented from directly impacting on the anti-explosion valve to easily damage the anti-explosion valve, and the normal use of the single battery is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular 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, easily resulting in damage to the explosion-proof valve and leakage of the battery cell, and easily causing 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 at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a housing assembly and a battery cell, wherein the shielding member of the housing assembly can block the electrolyte, prevent the electrolyte from directly impacting on the explosion-proof valve and easily causing damage to the explosion-proof valve, and ensure the normal use of the battery cell.

[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 for a battery cell and includes: a housing body, on which an explosion-proof valve of the battery cell is provided; an end plate, which is arranged in 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 open end of 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 covers the open end and is adhesively connected to the end plate, and the projections of the plurality of through holes towards the shielding member all fall within the contour of the shielding member.

[0006] For the housing assembly according to an embodiment of the utility model, an explosion-proof valve of the battery cell is provided on the housing body, the end plate is arranged in 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 open end of the groove faces the explosion-proof valve, and a plurality of through holes are provided on the bottom wall of the groove. Since the projections of the plurality of through holes towards the shielding member all fall within the contour of the shielding member, 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, and ensure the normal use of the battery cell. At the same time, the shielding member covers the open end and is adhesively connected to the end plate, thereby realizing the connection between the shielding member and the end plate, further ensuring the shielding effect of the shielding member, improving the reliability of the housing assembly, and having a low assembly difficulty for the adhesive connection, effectively improving the assembly efficiency.

[0007] In some embodiments of the present utility model, the shielding member has exhaust holes penetrating through the shielding member in the thickness direction of the shielding member, and the exhaust holes are used for exhausting gas.

[0008] In some embodiments of the present utility model, the shielding member further includes a baffle plate, the baffle plate is located in the exhaust hole and is connected to the inner wall of the exhaust hole, and the middle area of the baffle plate protrudes towards the pole group or the explosion-proof valve.

[0009] In some embodiments of the present utility model, the number of the exhaust holes is one or more.

[0010] In some embodiments of the present utility model, the shielding member covers a part of the open mouth.

[0011] In some embodiments of the present utility model, the shielding member includes: a diaphragm assembly, projections of the plurality of through holes towards the shielding member all fall within the contour of the diaphragm assembly; a first adhesive layer, the first adhesive layer is located between the diaphragm assembly and the end plate and is respectively connected to the diaphragm assembly and the end plate.

[0012] In some embodiments of the present utility model, the diaphragm assembly includes a plurality of diaphragms stacked in the thickness direction of the shielding member, and a second adhesive layer is provided between any two adjacent diaphragms.

[0013] In some embodiments of the present utility model, the thickness of the diaphragm is 20 μm - 150 μm; and / or, the thickness of the first adhesive layer is 10 μm - 100 μm; and / or, the thickness of the second adhesive layer is 10 μm - 100 μm.

[0014] In some embodiments of the present utility model, the diaphragm is a PP part, a PET part or a PE part.

[0015] The housing assembly according to the embodiment of the present utility model includes the above-mentioned battery cell.

[0016] For the battery cell according to the embodiment of the present utility model, a housing assembly is provided. An explosion-proof valve of the battery cell is provided on the housing body. The end plate is arranged in the housing body and is located on the side of the pole 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 open mouth of the groove faces the explosion-proof valve. A plurality of through holes are provided on the bottom wall of the groove. Projections of the plurality of through holes towards the shielding member all fall within the contour of the shielding member, so that the shielding member can block the electrolyte and prevent the electrolyte from directly impacting on the explosion-proof valve and easily causing damage to the explosion-proof valve, ensuring the normal use of the battery cell. At the same time, the shielding member is covered at the open mouth and is adhesively connected to the end plate, thereby realizing the connection between the shielding member and the end plate, further ensuring the shielding effect of the shielding member, improving the reliability of the housing assembly, and having a low assembly difficulty for the adhesive connection, effectively improving the assembly efficiency.

[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 following description of embodiments in conjunction with the accompanying drawings, wherein:

[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 a perspective view of an end plate and a shielding member according to an embodiment of the present utility model;

[0022] Figure 4 is an exploded view of an end plate and a shielding member according to an embodiment of the present utility model;

[0023] Figure 5 is Figure 4 an enlarged view of part B in

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

[0025] Figure 7 is a bottom view of an end plate and a shielding member according to an embodiment of the present utility model;

[0026] Figure 8 is a top view of a shielding member according to another embodiment of the present utility model;

[0027] Figure 9 is a top view of a shielding member according to still another embodiment of the present utility model;

[0028] Figure 10 is Figure 9 a side view of

[0029] Figure 11 is a schematic view of a shielding member according to an embodiment of the present utility model;

[0030] Figure 12 is a schematic view of a shielding member according to yet another embodiment of the present utility model.

[0031] REFERENCE NUMERALS:

[0032] 1000, battery cell;

[0033] 100, housing assembly;

[0034] 1. Housing body

[0035] 2. End plate; 21. Groove; 211. Bottom wall of the groove; 2111. Through hole; 212. Open end

[0036] 3. Shielding member; 31. Exhaust hole; 32. Flap; 33. Diaphragm assembly; 331. Diaphragm; 332. Second adhesive layer; 34. First adhesive layer

[0037] 4. Insulating member; 41. Avoidance hole

[0038] 200. Explosion-proof valve

[0039] 300. Electrode group

[0040] 400. Electrolyte Detailed implementation manners

[0041] 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 by referring 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.

[0042] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0043] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" 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 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 can be understood according to specific situations.

[0044] The housing assembly 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0045] As Figures 1-7 shown, the housing assembly 100 according to an embodiment of the present invention is for a battery cell 1000 and includes a housing body 1, an end plate 2, and a shielding member 3. Among them, the battery cell 1000 can be a blade battery.

[0046] Specifically, an explosion-proof valve 200 of the battery cell 1000 is provided on the housing body 1. The end plate 2 is disposed inside the housing body 1, and the end plate 2 is located on the side of the electrode group 300 of the battery cell 1000 facing the explosion-proof valve 200. The housing body 1 can protect the electrode group 300 to prevent the electrode group 300 from being exposed and damaged. At the same time, the end plate 2 can support and insulate the electrode group 300, meet the support and insulation requirements of the electrode group 300, and can prevent the electrode group 300 from contacting the explosion-proof valve 200 to cause safety hazards and other problems, ensuring the safety of the battery cell 1000.

[0047] A groove 21 is formed on one side in the thickness direction of the end plate 2. The open end 212 of the groove 21 faces the explosion-proof valve 200. A plurality of (greater than or equal to two) through holes 2111 are provided on the bottom wall 211 of the groove 21, so that the plurality of through holes 2111 can communicate the electrode group 300 and the explosion-proof valve 200. When the battery cell 1000 undergoes thermal runaway, the gas in the housing assembly 100 can smoothly pass through the plurality of through holes 2111 and rush out from the explosion-proof valve 200 to realize pressure relief and exhaust, release the internal pressure of the battery cell 1000, and ensure the use safety of the battery cell 1000.

[0048] In the related art, when the battery cell 1000 is placed, if the explosion-proof valve 200 is located below the housing assembly 100, the electrolyte 400 inside the battery cell 1000 will accumulate in the groove 21. When the battery cell 1000 shakes, the electrolyte 400 will shake back and forth, causing the electrolyte 400 to continuously impact the explosion-proof valve 200, easily causing damage to the explosion-proof valve 200 and resulting in problems such as leakage of the battery cell 1000, and easily causing the explosion-proof valve 200 to open in advance, affecting the normal use of the battery cell 1000.

[0049] Therefore, in the present utility model, the housing assembly 100 further includes a shielding member 3, and the projections of the plurality of through holes 2111 toward the shielding member 3 all fall within the contour of the shielding member 3. Thus, when the battery cell 1000 vibrates, the electrolyte 400 can be blocked by the shielding member 3. For example, the shielding member 3 can block the electrolyte 400 flowing from the plurality of through holes 2111 to the explosion-proof valve 200 or prevent the electrolyte 400 from flowing to the plurality of through holes 2111, preventing the electrolyte 400 from directly impacting on the explosion-proof valve 200 and easily causing damage to the explosion-proof valve 200, thereby avoiding problems such as leakage of the battery cell 1000 and premature opening of the explosion-proof valve 200, and ensuring the normal use of the battery cell 1000. At the same time, the shielding member 3 covers the open end 212 and is adhesively connected to the end plate 2, thereby realizing the connection between the shielding member 3 and the end plate 2, further ensuring the shielding effect of the shielding member 3, improving the reliability of the housing assembly 100, and having a low assembly difficulty for adhesive connection, effectively improving the assembly efficiency.

[0050] In an embodiment of the present utility model, the specific structure of the shielding member 3 can be set according to actual situations. For example, the shielding member 3 can be formed into a square shape, a cross shape, an I-shaped shape, a circular shape, a racetrack shape, etc., all of which can achieve the shielding of the through holes 2111 and prevent the electrolyte 400 from directly impacting on the explosion-proof valve 200 and easily causing damage to the explosion-proof valve 200.

[0051] According to the housing assembly 100 of the embodiment of the present utility model, an explosion-proof valve 200 of the battery cell 1000 is provided on the housing body 1, the end plate 2 is disposed inside the housing body 1 and on the side of the electrode group 300 of the battery cell 1000 facing the explosion-proof valve 200. A groove 21 is formed on one side in the thickness direction of the end plate 2. The open end 212 of the groove 21 faces the explosion-proof valve 200. A plurality of through holes 2111 are provided on the bottom wall 211 of the groove 21. The projections of the plurality of through holes 2111 toward the shielding member 3 all fall within the contour of the shielding member 3, so that the shielding member 3 can block the electrolyte 400, preventing the electrolyte 400 from directly impacting on the explosion-proof valve 200 and easily causing damage to the explosion-proof valve 200, and ensuring the normal use of the battery cell 1000. At the same time, the shielding member 3 covers the open end 212 and is adhesively connected to the end plate 2, thereby realizing the connection between the shielding member 3 and the end plate 2, further ensuring the shielding effect of the shielding member 3, improving the reliability of the housing assembly 100, and having a low assembly difficulty for adhesive connection, effectively improving the assembly efficiency.

[0052] In some embodiments of the present utility model, such as Figure 8 and Figure 9As shown, the shielding member 3 has exhaust holes 31 that penetrate through the shielding member 3 in the thickness direction of the shielding member 3. The exhaust holes 31 are used for exhausting gas. Thus, through the exhaust holes 31, it is avoided that the shielding member 3 completely shields the open mouth 212 and affects the exhaust of the explosion-proof valve 200. When the battery cell 1000 has a thermal runaway, the gas can smoothly exhaust through the exhaust holes 31, ensuring the safety of use.

[0053] In some embodiments of the present invention, such as Figure 9 and Figure 10 As shown, the shielding member 3 further includes a baffle 32. The baffle 32 is located in the exhaust hole 31 and is connected to the inner wall of the exhaust hole 31. The middle area of the baffle 32 protrudes towards the electrode group 300 or the explosion-proof valve 200. Thus, during the process of the gas exhausting through the exhaust hole 31, the baffle 32 plays a certain role in guiding the flow, further facilitating the exhaust of the gas, and improving the safety and reliability of the battery cell 1000.

[0054] Furthermore, the baffle 32 and the shielding member 3 are an integral part. Thus, the connection strength between the two is ensured, and the overall reliability is improved. It should be noted that a penetrating line can be opened on the shielding member 3, such that the baffle 32 is the self-structure of the shielding member 3, further simplifying the process.

[0055] In some embodiments of the present invention, the exhaust holes 31 are one or more. Specifically, as Figure 8 shown, the exhaust hole 31 is one, or, as Figure 9 shown, the exhaust holes 31 are multiple. Thus, while ensuring that the exhaust holes 31 enable the gas to be discharged from the explosion-proof valve 200, different numbers of exhaust holes 31 can be set according to different battery cells 1000, improving the versatility of the shielding member 3.

[0056] In some embodiments of the present invention, the shielding member 3 covers a part of the open mouth 212. Thus, through such a setting, it is avoided that the shielding member 3 completely shields the open mouth 212 and affects the exhaust of the explosion-proof valve 200. When the battery cell 1000 has a thermal runaway, the gas can smoothly exhaust through the gap between the shielding member 3 and the open mouth 212, ensuring the safety of use.

[0057] In some embodiments of the present invention, such as Figure 11As shown, the shielding member 3 includes a diaphragm assembly 33 and a first adhesive layer 34. Among them, the projections of the plurality of through holes 2111 towards the shielding member 3 all fall within the contour of the diaphragm assembly 33. The first adhesive layer 34 is located between the diaphragm assembly 33 and the end plate 2 and is connected to the diaphragm assembly 33 and the end plate 2 respectively. Thus, the bonding connection between the diaphragm assembly 33 and the end plate 2 is realized through the first adhesive layer 34, ensuring that the projections of the plurality of through holes 2111 towards the shielding member 3 always fall within the contour of the diaphragm assembly 33, so that the diaphragm assembly 33 can block the electrolyte 400 and prevent the electrolyte 400 from directly impacting the explosion-proof valve 200 and easily damaging the explosion-proof valve 200, ensuring the normal use of the battery cell 1000.

[0058] In some embodiments of the present utility model, as Figure 12 shown, the diaphragm assembly 33 includes a plurality of diaphragms 331 stacked along the thickness direction of the shielding member 3, and there is a second adhesive layer 332 between any two adjacent diaphragms 331. Thus, through such a setting, the structural strength of the diaphragm assembly 33 is enhanced, avoiding the diaphragm assembly 33 from cracking when being impacted by the electrolyte 400, further ensuring that the diaphragm assembly 33 blocks the electrolyte 400 and improving the reliability of the shielding member 3. It should be noted that the diaphragm assembly 33 may also have only one layer of diaphragm 331.

[0059] Optionally, the thickness of the diaphragm assembly 33 is 20μm - 150μm. It can be understood that the thickness of the diaphragm assembly 33 can be 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, or 150μm. Thus, by the thickness of the diaphragm assembly 33 being not less than 20μm, the strength of the diaphragm assembly 33 can be ensured, avoiding the diaphragm assembly 33 from cracking when being impacted by the electrolyte 400; by the thickness of the diaphragm assembly 33 being not greater than 150μm, the thickness dimension of the diaphragm assembly 33 can be avoided from being too large, and the space occupied by the diaphragm assembly 33 inside the housing assembly 100 can be avoided from being too large.

[0060] In some embodiments of the present utility model, the thickness of the diaphragm 331 is 20μm - 150μm. It can be understood that the thickness of the diaphragm 331 can be 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, or 150μm. Thus, by the thickness of the diaphragm 331 being not less than 20μm, the strength of the diaphragm 331 can be ensured, avoiding the diaphragm assembly 33 from cracking when being impacted by the electrolyte 400; by the thickness of the diaphragm 331 being not greater than 150μm, the thickness dimension of the diaphragm assembly 33 can be avoided from being too large, and the space occupied by the diaphragm assembly 33 inside the housing assembly 100 can be avoided from being too large.

[0061] In some embodiments of the present utility model, the thickness of the first adhesive layer 34 is 10 μm - 100 μm. It can be understood that the thickness of the first adhesive layer 34 can be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm. Thus, by ensuring that the thickness of the first adhesive layer 34 is not less than 10 μm, the connection strength between the diaphragm assembly 33 and the end plate 2 can be guaranteed, and the diaphragm assembly 33 can be prevented from cracking when subjected to the impact of the electrolyte 400; by ensuring that the thickness of the first adhesive layer 34 is not greater than 100 μm, the excessive thickness dimension of the first adhesive layer 34 can be avoided, and the excessive space occupied by the shielding member 3 inside the housing assembly 100 can be avoided.

[0062] In some embodiments of the present utility model, the thickness of the second adhesive layer 332 is 10 μm - 100 μm. It can be understood that the thickness of the second adhesive layer 332 can be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm. Thus, by ensuring that the thickness of the second adhesive layer 332 is not less than 10 μm, the connection strength between adjacent diaphragms 331 can be guaranteed, and the diaphragm assembly 33 can be prevented from cracking when subjected to the impact of the electrolyte 400; by ensuring that the thickness of the second adhesive layer 332 is not greater than 100 μm, the excessive thickness dimension of the second adhesive layer 332 can be avoided, and the excessive space occupied by the shielding member 3 inside the housing assembly 100 can be avoided.

[0063] In some embodiments of the present utility model, the diaphragm 331 is a PP (polypropylene) member, a PET (polyethylene glycol terephthalate) member or a PE (polyethylene) member. Thus, through such a setting, the diaphragm 331 can select different materials according to different battery cells 1000, improving the versatility of the shielding member 3.

[0064] In some embodiments, such as Figure 1 and Figure 2 shown, the housing assembly 100 further includes an insulating member 4. The insulating member 4 is disposed between the end plate 2 and the explosion-proof valve 200. The insulating member 4 can increase the insulation effect between the housing body 1 and the electrode group 300, preventing the battery cell 1000 from being short-circuited. The insulating member 4 is provided with an avoidance hole 41, and the avoidance hole 41 is correspondingly arranged with the explosion-proof valve 200. When thermal runaway occurs, the gas inside the housing assembly 100 can first pass through the through hole 2111, then enter the groove 21, and then pass through the gap between the shielding member 3 and the open port 212 or the exhaust hole 31, and then pass through the avoidance hole 41 on the insulating member 4, and finally break through the explosion-proof valve 200 to discharge from the battery cell 1000, increasing the thermal safety of the battery cell 1000.

[0065] In some embodiments of the present utility model, the end plate 2 is a plastic part, which has good insulation, and the plastic part can be processed by injection molding or other methods, and the manufacturing process of the end plate 2 is relatively simple.

[0066] The battery cell 1000 of the embodiments of the present utility model will be described below.

[0067] The battery cell 1000 according to the embodiments of the present utility model includes a housing assembly 100.

[0068] For the battery cell 1000 according to the embodiments of the present utility model, a housing assembly 100 is provided. An explosion-proof valve 200 of the battery cell 1000 is provided on the housing body 1. The end plate 2 is arranged inside the housing body 1 and on the side of the electrode group 300 of the battery cell 1000 facing the explosion-proof valve 200. A groove 21 is formed on one side in the thickness direction of the end plate 2. The open end 212 of the groove 21 faces the explosion-proof valve 200. A plurality of through holes 2111 are provided on the bottom wall 211 of the groove 21. The projections of the plurality of through holes 2111 towards the shielding member 3 all fall within the contour of the shielding member 3, so that the shielding member 3 can block the electrolytic solution 400 and prevent the electrolytic solution 400 from directly impacting on the explosion-proof valve 200 and easily causing damage to the explosion-proof valve 200, ensuring the normal use of the battery cell 1000. At the same time, the shielding member 3 covers the open end 212 and is adhesively connected to the end plate 2, thereby realizing the connection between the shielding member 3 and the end plate 2, further ensuring the shielding effect of the shielding member 3, improving the reliability of the housing assembly 100, and having a low assembly difficulty for the adhesive connection, effectively improving the assembly efficiency.

[0069] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" 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 a suitable manner in any one or more embodiments or examples.

[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 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 a battery cell, characterized in that, and comprising: a housing body, on which an explosion-proof valve of the battery cell is provided; an end plate, which is arranged in the housing body and is located on a 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 open mouth of 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 covers the open mouth and is adhesively connected to the end plate. 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, The shielding member has an exhaust hole penetrating through the shielding member in the thickness direction of the shielding member, and the exhaust hole is used for exhausting gas.

3. The housing assembly according to claim 2, wherein, The shielding member further includes a baffle, which is located in the exhaust hole and is connected to the inner wall of the exhaust hole. The middle area of the baffle bulges towards the electrode group or the explosion-proof valve.

4. The housing assembly according to claim 2, characterized in that, The exhaust hole is one or more.

5. The housing assembly according to claim 1, characterized in that The shielding member covers a part of the open mouth.

6. The housing assembly according to claim 1, wherein, The shielding member includes: a diaphragm assembly, and the projections of the plurality of through holes towards the shielding member all fall within the contour of the diaphragm assembly; a first adhesive layer, which is located between the diaphragm assembly and the end plate and is respectively connected to the diaphragm assembly and the end plate.

7. The housing assembly according to claim 6, wherein The diaphragm assembly includes a plurality of diaphragms stacked along the thickness direction of the shielding member, and a second adhesive layer is provided between any two adjacent diaphragms.

8. The housing assembly according to claim 7, wherein, The thickness of the diaphragm is 20μm - 150μm; and / or, the thickness of the first adhesive layer is 10μm - 100μm; and / or, the thickness of the second adhesive layer is 10μm - 100μm.

9. The housing assembly according to claim 7, wherein The diaphragm is a PP part, a PET part or a PE part.

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

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