Shell structure and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a shell structure and a battery cell, the shell structure comprises a cover plate body, an anti-explosion valve, a lower plastic part and a flow blocking diaphragm, the cover plate body is provided with a first air outlet penetrating through the cover plate body in the first direction, the anti-explosion valve is arranged at the first air outlet, and the lower plastic part is attached to the inner side of the part of the cover plate body; the lower plastic part is provided with a second air outlet penetrating through the lower plastic part in the first direction, and at least part of the second air outlet is aligned with the first air outlet in the first direction. The flow blocking membrane is attached to the lower plastic part, and the flow blocking membrane can cover at least part of the second air outlet. According to the shell structure and the battery cell provided by the invention, the exhaust smoothness of the shell structure and the effectiveness of the explosion-proof valve are ensured, and the occurrence probability that the explosion-proof valve is impacted by electrolyte is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a shell structure and an electric core. Background Art

[0002] With the development of battery technology, the energy storage capacity of batteries has gradually increased, and the capacity of the electrolyte loaded inside the electric core has gradually increased. And nowadays, an explosion-proof valve is usually provided on the battery top cover for the electric core. In order to ensure the safety during the use of the battery, a thinning area that is easy for high-pressure gas to break through is usually provided on the explosion-proof valve.

[0003] Currently, a cavity is formed between the inner end plate of the electric core and the explosion-proof valve. In order to ensure the exhaust effectiveness of the explosion-proof valve, the cavity needs to have an exhaust hole communicating with the inside of the electric core. This makes the electrolyte inside the electric core easily accumulate in the cavity through the exhaust hole. Once the battery faces vibrations, shakes, collisions, drops and other situations, the excess electrolyte inside the electric core and / or the electrolyte accumulated in the cavity will impact the electric core shell from the inside. Once it impacts the thinning area of the explosion-proof valve, it is extremely easy to break through the explosion-proof valve, resulting in problems such as premature opening failure of the explosion-proof valve and leakage of the electric core. Summary of the Utility Model

[0004] The purpose of the present application is to provide a shell structure and an electric core, so as to solve to a certain extent the technical problem in the prior art that once the battery faces vibrations, shakes, collisions, drops and other situations, the excess electrolyte inside the electric core and / or the electrolyte accumulated in the cavity will impact the electric core shell from the inside. Once it impacts the thinning area of the explosion-proof valve, it is extremely easy to break through the explosion-proof valve, resulting in premature opening failure of the explosion-proof valve, leakage of the electric core, etc.

[0005] According to the first aspect of the present application, a shell structure is provided, including a cover plate body, an explosion-proof valve, a lower plastic part and a flow-blocking diaphragm. The cover plate body is provided with a first air outlet penetrating through the cover plate body along a first direction. The explosion-proof valve is arranged at the first air outlet. The lower plastic part is attached to the inner side of the part of the cover plate body. The lower plastic part is provided with a second air outlet penetrating through the lower plastic part along the first direction. At least part of the second air outlet is arranged to be aligned with the first air outlet in the first direction;

[0006] The flow-blocking diaphragm is attached to the lower plastic part, and the flow-blocking diaphragm can cover at least part of the second air outlet;

[0007] A breathable structure communicating with both the inside of the shell structure and the first air outlet is provided between the flow-blocking diaphragm and the second air outlet and / or on the flow-blocking diaphragm.

[0008] Preferably, the flow-blocking diaphragm is attached to the side of the lower plastic part facing the cover plate body;

[0009] And / or, the baffle diaphragm is attached to the side of the lower plastic part facing away from the cover body.

[0010] Preferably, the baffle diaphragm is a single-layer film structure;

[0011] And / or, the baffle diaphragm is a multi-layer film structure, and the multi-layer film structures are stacked in the first direction.

[0012] Preferably, the size of the film structure in the first direction is 20μm to 150μm;

[0013] And / or, the shell structure further includes a bonding part, and the baffle diaphragm is bonded and fixed to the lower plastic part via the bonding part;

[0014] When the baffle diaphragm is the multi-layer film structure, the bonding part is provided between adjacent two layers of the film structures to bond and fix adjacent two layers of the film structures via the bonding part.

[0015] Preferably, the size of the bonding part in the first direction is 10μm to 100μm.

[0016] Preferably, the second air outlet extends in the second direction, the baffle diaphragm includes a plurality of film bodies, the film bodies are arranged at intervals in the second direction, the ventilation structure includes a ventilation gap formed between adjacent two of the film bodies, and the second direction is perpendicular to the first direction;

[0017] And / or, the ventilation structure includes a ventilation part provided on the baffle diaphragm, and the ventilation part penetrates through the baffle diaphragm in the first direction.

[0018] Preferably, it further includes an end plate, the end plate is arranged on the side of the lower plastic part facing away from the cover body, the end plate is provided with an exhaust part, and in the first direction, at least part of the exhaust part is aligned with the first air outlet.

[0019] Preferably, the exhaust part is provided with a plurality of communication holes penetrating through the exhaust part in the first direction, and in the first direction, the communication holes are staggered from the ventilation structure.

[0020] Preferably, it further includes an enclosure wall, the enclosure wall encloses to form a cylindrical space extending in the first direction, and the cover body covers the end of the cylindrical space in the first direction;

[0021] The lower plastic part is attached to the inner side of the cover body.

[0022] According to the second aspect of the present application, a battery cell is provided, comprising the shell structure described in any of the above technical solutions, and thus having all the beneficial technical effects of the shell structure, which will not be described in detail herein.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The shell structure provided by the present application is characterized in that a baffle film is attached to the second air outlet on the lower plastic part of the cover body and is aligned with the explosion-proof valve, so that the baffle film covers at least a portion of the second air outlet to block the electrolyte inside the shell structure from flowing into the second air outlet, thereby effectively reducing the probability of the electrolyte impacting the explosion-proof valve; and at least a portion of the second air outlet is aligned with the first air outlet in the first direction, and a breathable structure connecting the interior of the shell structure and the first air outlet is provided between the baffle film and the second air outlet and / or on the baffle film, thereby effectively ensuring the smoothness of the exhaust of the shell structure and the effectiveness of the explosion-proof valve.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the exploded structure of the shell structure provided in Example 1 of the present application;

[0028] Figure 2 A schematic diagram of another exploded structure of the shell structure provided in Example 1 of the present application;

[0029] Figure 3 A schematic diagram of a cross-sectional structure obtained by cross-sectioning a shell structure provided in Embodiment 1 of the present application along a plane determined in a first direction and a second direction;

[0030] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the shell structure provided at A;

[0031] Figure 5 A schematic diagram of a cross-sectional structure obtained by cross-sectioning the shell structure provided in the first embodiment of the present application along a plane determined in a first direction and a third direction;

[0032] Figure 6Explosion structure schematic diagram of the battery cell provided by the embodiment of the present application;

[0033] Figure 7 Explosion structure schematic diagram of the shell structure provided by the second embodiment of the present application;

[0034] Figure 8 Another explosion structure schematic diagram of the shell structure provided by the second embodiment of the present application;

[0035] Figure 9 Explosion structure schematic diagram of the shell structure provided by the third embodiment of the present application;

[0036] Figure 10 Another explosion structure schematic diagram of the shell structure provided by the third embodiment of the present application.

[0037] Reference numerals:

[0038] 1 - Cover body; 11 - First air outlet; 2 - Lower plastic part; 21 - Second air outlet; 3 - End plate; 31 - Exhaust part; 32 - Communication hole; 4 - Baffle diaphragm; 40 - Diaphragm body; 41 - Ventilation gap; 42 - Ventilation hole structure; 43 - Ventilation tangent; 5 - Terminal; 6 - Explosion-proof valve; 61 - Patch; 7 - Enclosure wall.

[0039] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed implementation manners

[0040] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0041] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0042] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0043] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] Next, refer to Figures 1 to 10 Describe the shell structure and the battery cell according to some embodiments of the present application.

[0046] See Figures 1 to 10 As shown, an embodiment of the first aspect of the present application provides a shell structure, including a cover plate body 1, an explosion-proof valve 6, a lower plastic part 2, and a baffle diaphragm 4. The cover plate body 1 is provided with a first air outlet 11 penetrating the cover plate body 1 along a first direction F1. The explosion-proof valve 6 is arranged at the first air outlet 11. The lower plastic part 2 is attached to the inner side of the part of the cover plate body 1. The lower plastic part 2 is provided with a second air outlet 21 penetrating the lower plastic part 2 along the first direction F1. At least part of the second air outlet 21 is arranged to be aligned with the first air outlet 11 in the first direction F1. The baffle diaphragm 4 is attached to the lower plastic part 2, and the baffle diaphragm 4 can cover at least part of the second air outlet 21. A breathable structure communicating both the inside of the shell structure and the first air outlet 11 is provided between the baffle diaphragm 4 and the second air outlet 21 and / or on the baffle diaphragm 4.

[0047] According to the shell structure provided by the above technical features, by attaching a baffle diaphragm 4 at the second air outlet 21 aligned with the explosion-proof valve 6 on the lower plastic part 2 of the cover body 1, the baffle diaphragm 4 covers at least part of the second air outlet 21 to block the electrolyte inside the cover body 1 from flowing into the second air outlet 21, effectively reducing the probability of electrolyte impacting the explosion-proof valve 6; and by aligning at least part of the second air outlet 21 with the first air outlet 11 in the first direction F1, and providing a breathable structure communicating with both the inside of the shell structure and the first air outlet 11 between the baffle diaphragm 4 and the second air outlet 21 and / or on the baffle diaphragm 4, in this way, the exhaust smoothness of the shell structure and the effectiveness of the explosion-proof valve 6 can be effectively ensured.

[0048] As Figures 1 to 10 shown, F1 shown in the figure can be an example of the above-mentioned first direction F1, and F2 shown in the figure can be an example of the following second direction F2, wherein the first direction F1 and the second direction F2 are cross-set. Preferably, as Figures 1 to 10 shown, the first direction F1 and the second direction F2 can be perpendicular to each other to adapt to the existing battery cell structure. For the convenience of description, the direction perpendicular to the plane determined by both the first direction F1 and the second direction F2 is defined as the third direction F3, and F3 shown in the figure can be an example of the above-mentioned third direction F3.

[0049] Optionally, the above-mentioned first direction F1 can be the length direction of the battery cell, the above-mentioned second direction F2 can be the width direction of the battery cell, and the above-mentioned third direction F3 can be the thickness direction of the battery cell.

[0050] Preferably, as Figures 1 to 10 shown, the shell structure can further include a surrounding wall 7, and the surrounding wall 7 encloses a cylindrical space extending along the first direction F1, and the cover body 1 is covered on the end of the cylindrical space in the first direction F1. The lower plastic part 2 is attached to the inner side of the cover body.

[0051] Preferably, as Figure 1 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 9 shown, the above-mentioned explosion-proof valve 6 can be covered on the first exhaust port from the inner side of the cover body 1 to improve the connection stability between the explosion-proof valve 6 and the cover body 1.

[0052] Optionally, as Figure 1 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 9As shown, the above shell structure may further include a patch 61, which can be attached to the first exhaust port from the outside of the cover body 1 to cover the first exhaust port, thereby ensuring the aesthetics and flatness of the outside of the cover body 1.

[0053] It should be noted that the above explosion-proof valve 6 and patch 61 are both existing technologies in the art, and their specific structures will not be elaborated here.

[0054] Optionally, as Figure 6 illustrates an example where the surrounding wall 7 encloses to form a tubular space in the shape of a square tube. However, it is not limited to this. The above tubular space is not limited to the above square tube shape, and can also be a cylindrical shape, a polygon tube, or other irregular tube shapes.

[0055] Preferably, the above explosion-proof valve 6 can also be provided on the above cover body 1, and the lower plastic part 2 can be attached to the inner side of the cover body 1 to achieve insulation of the cover body 1.

[0056] However, it is not limited to this. The above explosion-proof valve 6 can also be provided on the surrounding wall 7. Correspondingly, the above lower plastic part 2 can be attached to the inner side of the surrounding wall 7 where the explosion-proof valve 6 is located.

[0057] Preferably, as Figures 1 to 5 shown, the above baffle diaphragm 4 can be attached to the side of the above lower plastic part 2 facing the cover body 1 to facilitate the assembly of the baffle diaphragm 4.

[0058] Optionally, not shown in the figure, the above baffle diaphragm 4 is attached to the side of the lower plastic part 2 facing away from the cover body 1 to increase the space between the baffle diaphragm 4 and the explosion-proof valve 6, thereby preventing interference between the baffle diaphragm 4 and the explosion-proof valve 6.

[0059] Optionally, the above baffle diaphragm 4 can be a single-layer film structure.

[0060] Preferably, the above baffle diaphragm 4 can also be a multi-layer film structure, and the multi-layer film structure is stacked along the first direction F1 to improve the strength of the baffle diaphragm 4 and prevent the baffle diaphragm 4 from being broken by the electrolyte or air flow.

[0061] Optionally, the above film structure can be a plastic film material such as PP film, PET film, or PE film.

[0062] Preferably, the size of the above film structure in the first direction F1 can be 20μm - 150μm to ensure the strength of the film structure.

[0063] Preferably, the above shell structure may further include a bonding part.

[0064] Preferably, the bonding part may include a first adhesive layer, and the above baffle diaphragm 4 can be bonded and fixed to the lower plastic part 2 via the first adhesive layer.

[0065] Optionally, the first adhesive layer may be fully spread over the portion of the baffle membrane 4 that overlaps with the lower plastic part 2 in the first direction. In other words, the first adhesive layer used for bonding the baffle membrane and the lower plastic part 2 may be applied only to the portion of the baffle membrane 4 that overlaps with the lower plastic part 2 in the first direction F1, and the portion of the first adhesive layer that is exposed by the first air outlet 11 in the first direction F1 is hollowed out to save the coverage area of ​​the first adhesive layer.

[0066] Preferably, the bonding portion may further include a second adhesive layer. When the baffle membrane 4 is a multi-layer membrane structure, a second adhesive layer is provided between two adjacent membrane structures to bond and fix the two adjacent membrane structures via the second adhesive layer to achieve fixation between the multi-layer membrane structures.

[0067] Preferably, the size of the adhesive layer in the first direction F1 is 10 μm to 100 μm to ensure the bonding strength of the adhesive layer.

[0068] In an embodiment, Figures 1 to 10 As shown, the shell structure may further include an end plate 3, which is disposed on a side of the lower plastic part 2 facing away from the cover plate body 1 to limit the position of the pole group in the shell structure.

[0069] Preferably, if Figures 1 to 4 As shown, the end plate 3 may be provided with an exhaust portion 31. In the first direction F1, the exhaust portion 31 is aligned with at least a portion of the first gas outlet 11 to facilitate the exhaust of the gas in the shell structure, thereby ensuring the smooth exhaust of the shell structure and the effectiveness of the explosion-proof valve 6.

[0070] Preferably, if Figure 2 , Figure 4 , Figure 8 and Figure 10 As shown, the exhaust portion 31 is provided with a plurality of connecting holes 32 penetrating the exhaust portion 31 along the first direction F1 to further facilitate the exhaust of the gas in the shell structure, thereby ensuring the smooth exhaust of the shell structure and the effectiveness of the explosion-proof valve 6.

[0071] Preferably, if Figure 2 , Figure 4 , Figure 8 and Figure 10 As shown, there may be a plurality of the communicating holes 32 , and the plurality of communicating holes 32 may be evenly distributed in the exhaust portion 31 .

[0072] Preferably, if Figure 2 , Figure 8 and Figure 10 As shown, the plurality of communication holes 32 may be distributed in the exhaust portion 31 in a matrix manner.

[0073] Preferably, if Figure 4As shown, in the first direction F1 , the connecting hole 32 and the air-permeable structure are staggered to further prevent the electrolyte inside the shell structure from impacting the explosion-proof valve 6 .

[0074] like Figures 1 to 5 and Figures 7 to 10 Three different forms of air permeability structures of the baffle membrane 4 are shown, and the three different forms of air permeability structures of the baffle membrane 4 are described in detail below.

[0075] Embodiment 1:

[0076] like Figures 1 to 5 The baffle membrane 4 may include a plurality of membrane bodies 40 , and the membrane bodies 40 may be arranged at intervals along a predetermined direction. The air-permeable structure may include an air-permeable gap 41 formed between two adjacent membrane bodies 40 .

[0077] Optionally, not shown in the figure, the sum of the dimensions of the above-mentioned baffle diaphragm 4 in the predetermined direction (i.e., the sum of the dimensions of the multiple membrane bodies 40 and the multiple air-permeable gaps 41 in the predetermined direction) can be smaller than the dimension of the second air outlet 21 in the predetermined direction, so that an air gap is formed between at least one side of the baffle diaphragm 4 in the predetermined direction and the lower plastic part 2, so as to further improve the exhaust capacity of the baffle diaphragm 4.

[0078] like Figures 1 to 5 An example is shown in which the second air outlet 21 extends along the second direction F2 . Correspondingly, the predetermined direction may coincide with the second direction F2 , so that the plurality of membrane bodies 40 included in the baffle membrane 4 are sequentially spaced apart along the extending direction of the second air outlet 21 .

[0079] like Figures 1 to 5 An example is shown in which the number of the membrane bodies 40 is three, but the invention is not limited thereto, and the number of the membrane bodies 40 may be adaptively adjusted according to the sizes of both the second exhaust port and the membrane body 40 .

[0080] It should be noted that if Figure 4 As shown, the connecting holes 32 and the ventilation structure are staggered in the first direction F1. It can be understood that the portion between two adjacent columns (rows) of the connecting holes 32 of the exhaust portion 31 and the ventilation gap 41 are both arranged opposite to each other in the first direction F1.

[0081] In an embodiment, Figures 7 to 10 As shown, the above-mentioned air permeable structure may further include a vent portion disposed on the baffle film 4, the vent portion penetrating the baffle film 4 along the first direction F1, so that the baffle film 4 can achieve smooth exhaust of the second exhaust port through the vent portion.

[0082] Embodiment 2:

[0083] like Figure 7 andFigure 8 As shown, the above-mentioned ventilation part can form a ventilation hole structure 42 that penetrates the baffle diaphragm 4 along the first direction F1. In the figure, the ventilation hole structure 42 is shown in the form of a round hole, however, it is not limited thereto. As long as the air permeability of the baffle diaphragm 4 can be achieved, the above-mentioned ventilation hole structure 42 can also be a square hole, a polygonal hole, an oval hole, a spiral hole, a strip-shaped hole or other special-shaped holes.

[0084] Figure 7 and Figure 8 An example where the number of the above-mentioned ventilation hole structures 42 is 1 is shown. However, it is not limited thereto. As long as the air permeability of the baffle diaphragm 4 can be achieved, the number of the above-mentioned ventilation hole structures 42 can also be multiple.

[0085] It should be noted that the communication hole 32 and the ventilation structure are staggeredly arranged in the first direction F1. It can be understood that the part between two adjacent columns (rows) of the communication holes 32 in the exhaust part 31 and the ventilation hole structure 42 are arranged opposite to each other in the first direction F1.

[0086] Embodiment 3:

[0087] As Figure 9 and Figure 10 shown, the above-mentioned ventilation part can form a ventilation tangent line 43 that penetrates the baffle diaphragm 4 along the first direction F1. It should be noted that the ventilation tangent line 43 can be understood as a cutting line formed on the baffle diaphragm 4 that penetrates the baffle diaphragm 4, that is, the parts of the baffle diaphragm 4 on both sides of the ventilation tangent line 43 are not connected at the position of the ventilation tangent line 43. In this way, the exposed area of the ventilation part is further reduced, and the completeness of the baffle diaphragm 4 to block the electrolyte is further improved.

[0088] Figure 7 and Figure 8 An example where the ventilation tangent line 43 is in the form of a straight line is shown. However, it is not limited thereto. As long as the air permeability of the baffle diaphragm 4 can be achieved, the above-mentioned ventilation tangent line 43 can also be an arc, a wavy line, a spiral line, a broken line or other special-shaped lines.

[0089] Figure 7 and Figure 8 An example where the above-mentioned ventilation tangent line 43 extends along the second direction F2 is shown. However, it is not limited thereto. The above-mentioned ventilation tangent line 43 can also extend in any direction in the plane determined by the second direction F2 and the third direction F3, for example, the third direction F3.

[0090] Figure 7 and Figure 8 An example where the number of the above-mentioned ventilation tangent lines 43 is 2 is shown. However, it is not limited thereto. As long as the air permeability of the baffle diaphragm 4 can be achieved, the number of the above-mentioned ventilation tangent lines 43 can also be 1 or multiple.

[0091] An embodiment of the second aspect of the present application further provides an electric core, including the shell structure described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this shell structure and will not be elaborated here.

[0092] Preferably, the electric core may further include the above-mentioned electrode group, and the electrode group is arranged inside the above-mentioned shell structure.

[0093] Optionally, the electric core may further include a terminal 5, and the terminal 5 may be fixedly arranged on the above-mentioned cover plate body 1.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A shell structure, characterized in that: The invention comprises a cover body, an explosion-proof valve, a lower plastic part and a baffle film, wherein the cover body is provided with a first air outlet penetrating the cover body along a first direction, the explosion-proof valve is provided at the first air outlet, the lower plastic part is attached to the inner side of a part of the cover body, the lower plastic part is provided with a second air outlet penetrating the lower plastic part along the first direction, and at least a part of the second air outlet is aligned with the first air outlet in the first direction; The baffle film is attached to the lower plastic part, and the baffle film can cover at least a portion of the second air outlet; A ventilating structure communicating the interior of the shell structure and the first air outlet is provided between the baffle membrane and the second air outlet and / or on the baffle membrane.

2. The shell structure according to claim 1, characterized in that The baffle film is attached to the side surface of the lower plastic part facing the cover plate body; And / or, the baffle film is attached to the side surface of the lower plastic part facing away from the cover plate body.

3. The shell structure according to claim 1, characterized in that The baffle membrane is a single-layer membrane structure; And / or, the baffle film is a multi-layer film structure, and the multi-layer film structure is stacked along the first direction.

4. The shell structure according to claim 3, characterized in that The size of the membrane structure in the first direction is 20 μm to 150 μm; And / or, the shell structure further includes a bonding portion, and the baffle membrane is bonded and fixed to the lower plastic part via the bonding portion; When the baffle film is the multi-layer film structure, the bonding portion is provided between two adjacent layers of the film structure, so that the two adjacent layers of the film structure are bonded and fixed via the bonding portion.

5. The shell structure according to claim 4, characterized in that The size of the bonding portion in the first direction is 10 μm to 100 μm.

6. The shell structure according to any one of claims 1 to 5, characterized in that The second air outlet extends along a second direction, the baffle membrane comprises a plurality of membrane bodies, the membrane bodies are arranged at intervals along the second direction, the air permeable structure comprises an air permeable gap formed between two adjacent membrane bodies, and the second direction is perpendicular to the first direction; And / or, the air-permeable structure includes a vent portion provided on the baffle membrane, and the vent portion penetrates the baffle membrane along the first direction.

7. The shell structure according to claim 1, characterized in that It also includes an end plate, which is arranged on a side of the lower plastic part facing away from the cover plate body, and the end plate is provided with an exhaust portion, and in the first direction, the exhaust portion is aligned with at least a portion of the first air outlet.

8. The shell structure according to claim 7, characterized in that The exhaust portion is provided with a plurality of communication holes penetrating the exhaust portion along the first direction. In the first direction, at least part of the communication holes are staggered with the air-permeable structure.

9. The shell structure according to claim 1, characterized in that It also includes a surrounding wall, the surrounding wall is arranged to form a cylindrical space extending along the first direction, and the cover body is arranged to cover an end of the cylindrical space in the first direction; The lower plastic part is attached to the inner side of the cover body.

10. A battery cell, characterized in that: A shell structure comprising any one of claims 1 to 9.

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