Battery cell structure and battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cell structure and a battery, the battery cell structure comprises a shell module, the shell module comprises a shell body and a sealing plate, the shell body comprises a top wall and a side wall, the side wall is formed by extending the peripheral edge of the top wall along a first direction towards a direction far away from the top wall, the side wall and the top wall jointly define a containing cavity, and the sealing plate is arranged in the containing cavity; the containing cavity is suitable for containing a pole group module; the sealing plate is welded with the top wall; a liquid injection hole is formed in the sealing plate and communicates with the containing cavity. The bottom plate module and the top wall are oppositely arranged in the first direction, the bottom plate module comprises a plate body, and the plate body is suitable for being welded to the side, away from the top wall, of the side wall in the first direction; an anti-explosion opening is formed in the plate body, and the anti-explosion opening is communicated with the containing cavity; the bottom plate module further comprises an anti-explosion valve, the anti-explosion valve is welded to the plate body, and the anti-explosion valve is suitable for sealing the anti-explosion opening. According to the battery cell structure provided by the utility model, the pollution of electrolyte to the explosion-proof valve during liquid injection is avoided, and the safety performance of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a cell structure and a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries, as power batteries, are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0003] In the existing lithium-ion battery, the electrolyte is easy to contaminate the explosion-proof valve during liquid injection, which affects the safety performance of the battery. Summary of the Utility Model

[0004] In view of this, the utility model provides a cell structure and a battery to solve the problem that the electrolyte is easy to contaminate the explosion-proof valve during liquid injection of the existing lithium-ion battery.

[0005] In a first aspect, the utility model provides a cell structure, including:

[0006] A housing module, including a housing body and a sealing plate, the housing body includes a top wall and a side wall extending from the peripheral edge of the top wall in a first direction away from the top wall, the side wall and the top wall jointly enclose a receiving cavity, and a pole group module is adapted to be received in the receiving cavity;

[0007] The sealing plate is welded to the top wall; a liquid injection hole is formed in the sealing plate, and the liquid injection hole is communicated with the receiving cavity;

[0008] A bottom plate module, disposed opposite to the top wall in the first direction, the bottom plate module includes a plate body, and the plate body is adapted to be welded to the side of the side wall away from the top wall in the first direction; an explosion-proof port is formed in the plate body, and the explosion-proof port is communicated with the receiving cavity;

[0009] The bottom plate module further includes an explosion-proof valve, the explosion-proof valve is welded to the plate body, and the explosion-proof valve is adapted to close the explosion-proof port.

[0010] Beneficial effects: In the cell structure provided by the utility model, by providing a sealing plate on the top wall of the housing body, the sealing plate is welded to the top wall, and a liquid injection hole is formed in the sealing plate, so that the electrolyte is injected into the cell through the liquid injection hole; the bottom plate module is disposed opposite to the top wall in the first direction, and by providing an explosion-proof valve on the plate body of the bottom plate module, the explosion-proof valve and the liquid injection hole are respectively disposed on two sides of the cell housing in the first direction, avoiding the contamination of the explosion-proof valve by the electrolyte during liquid injection, and improving the safety performance of the cell.

[0011] In an optional embodiment, the housing module further includes a pole column, an insulating component and a connecting piece, the pole column is riveted and fixed to the top wall, and an insulating component is disposed between the pole column and the top wall for insulation;

[0012] A pole lug unit is provided on one side of the pole group module facing the top wall along the first direction, and the pole lug unit is staggered and aligned with the pole along the first direction;

[0013] The connecting piece is arranged on one side of the top wall facing the pole group module, and one end of the connecting piece in the third direction is suitable for being welded and fixed to the pole column, and the other end is suitable for being welded to the pole lug unit.

[0014] Beneficial effects: the pole is fixed to the top wall by riveting, an insulating component is arranged between the pole and the top wall for insulation, and one end of the connecting piece in the third direction is welded and fixed to the pole, so that the shell module forms an integral structural module, which is convenient for the overall supply and assembly of the shell module and improves the production efficiency; the sealing plate is arranged independently of the shell body before the battery cell is assembled, and when the pole group module is completed into the shell and the connecting piece and the pole ear unit are welded, the sealing plate is welded to the shell body, so that the welding channel is closed by the sealing plate.

[0015] In an optional embodiment, the pole lug unit has a first state of being vertically arranged along a first direction and a second state of being arranged at an angle to the first direction after being bent; the pole group module is suitable for being put into the shell in the first state, and the pole lug unit is suitable for extending along the first direction to the side of the connecting piece away from the pole group module in the first state; the pole lug unit is suitable for being welded with the connecting piece in the second state;

[0016] A welding channel is formed on the top wall, and the welding channel is suitable for providing an avoidance space for the bending of the pole lug unit and the welding of the pole lug unit and the connecting sheet;

[0017] The sealing plate closes the welding channel.

[0018] Beneficial effects: By opening a welding channel on the top wall, on the one hand, an operating space is provided for the bending of the pole ear unit, and on the other hand, a welding space is provided for the welding of the pole ear unit and the connecting piece, which reduces the space occupied by the pole ear unit and the connecting piece in the first direction, saves the bending process of the connecting piece, improves the internal space utilization of the battery, and improves the production efficiency; after the pole ear unit and the connecting piece are welded, the sealing plate is welded to the top wall, so that the welding channel is closed by the sealing plate to achieve the sealing of the top wall. At the same time, by setting the explosion-proof valve on the plate body of the bottom plate module, not only can the contamination of the explosion-proof valve by the electrolyte during injection be avoided, but also a welding channel with a sufficient area can be opened on the top wall to ensure a sufficient welding area between the connecting piece and the pole ear unit, thereby improving the flow capacity of the battery; the injection hole is opened on the sealing plate instead of directly on the top wall, which can make the setting of the injection hole more flexible, avoid affecting or compressing the area of ​​the welding channel, and avoid affecting the welding space between the connecting piece and the pole ear unit.

[0019] In an alternative embodiment, the insulating assembly includes a first insulating member disposed on one side of the top wall facing the electrode group module in the first direction, and the first insulating member is adapted to insulate between the top wall and the tab unit.

[0020] A first through hole is formed in the first insulating member, and the first through hole is disposed opposite to the welding channel in the first direction, and the first through hole is adapted to avoid the tab unit.

[0021] Beneficial effects: By providing the first insulating member on one side of the top wall facing the electrode group module in the first direction, the first insulating member is used to insulate between the top wall and the tab unit, thereby avoiding internal short circuit of the battery caused by contact between the top wall and the tab unit; by forming the first through hole in the first insulating member, when the electrode group module is inserted into the housing, the tab unit can pass through the first through hole and extend along the first direction to the side of the connecting piece away from the electrode group module, thereby realizing the welding of the tab unit and the connecting piece; after the tab unit and the connecting piece are welded, at least part of the tab unit is built into the first through hole, thereby reducing the space occupied by the tab unit and the connecting piece in the first direction and improving the space utilization rate inside the battery.

[0022] In an alternative embodiment, a second through hole is further formed in the first insulating member, and the second through hole is adapted to communicate the liquid injection hole with the accommodating cavity.

[0023] Beneficial effects: Thus, the electrolyte can be injected into the core through the liquid injection hole and the second through hole.

[0024] In an alternative embodiment, the housing module further includes a second insulating member disposed on one side of the sealing plate facing the electrode group module in the first direction, and the second insulating member is adapted to insulate between the sealing plate and the tab unit.

[0025] Beneficial effects: Thus, internal short circuit of the battery caused by contact between the sealing plate and the tab unit is avoided.

[0026] In an alternative embodiment, the top wall includes a first boss portion circumferentially disposed around the inner peripheral wall of the welding channel, and the first boss portion is adapted to support the sealing plate.

[0027] Beneficial effects: By providing the first boss portion on the top wall, the first boss portion is used to support the sealing plate, thereby avoiding the sealing plate from shifting, ensuring the welding yield between the sealing plate and the top wall, and thus ensuring the connection strength and sealing performance between the sealing plate and the top wall.

[0028] In an alternative embodiment, a sink is formed on one side of the plate body facing the electrode group module in the first direction, and the explosion-proof valve is adapted to be received in the sink.

[0029] The plate body includes a second boss portion, and the second boss portion is adapted to support the explosion-proof valve.

[0030] Advantageous effects: By providing a counterbore on one side of the plate body facing the electrode group module in the first direction, the explosion-proof valve is installed in the counterbore, reducing the space occupied by the explosion-proof valve in the first direction and improving the space utilization rate inside the battery; by providing a second boss portion on the plate body, the explosion-proof valve is supported by the second boss portion to prevent the explosion-proof valve from shifting, ensuring the welding yield between the explosion-proof valve and the plate body, thereby guaranteeing the connection strength and sealing performance between the explosion-proof valve and the plate body.

[0031] In an optional embodiment, the bottom plate module further includes a sealing sheet, and the sealing sheet is disposed on the side of the plate body away from the electrode group module, and the sealing sheet is adapted to seal the explosion-proof port.

[0032] Advantageous effects: By sealing the explosion-proof port with the sealing sheet, foreign matter contamination and / or damage to the explosion-proof valve are avoided, ensuring the normal working performance of the explosion-proof valve and improving the safety of the battery.

[0033] In a second aspect, the present invention also provides a battery, including: an electrode group module, and the cell structure as described above.

[0034] Advantageous effects: The battery in the second aspect includes the cell structure in the first aspect. Therefore, the battery in the second aspect includes all the advantageous effects of the cell structure in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 is a perspective view of a cell structure according to an embodiment of the present invention;

[0037] Figure 2 is Figure 1 a top view of the cell structure shown;

[0038] Figure 3 is Figure 2 a cross-sectional view taken along the A-A section in ;

[0039] Figure 4 is Figure 3 a partially enlarged schematic view at B in ;

[0040] Figure 5 is Figure 3Partial enlarged schematic diagram at position C in

[0041] Figure 6 is Figure 3 Partial enlarged schematic diagram at position D in

[0042] Figure 7 is Figure 1 Stereogram of the housing module of the battery cell structure shown in

[0043] Figure 8 is Figure 7 Top view of the housing module shown in

[0044] Figure 9 is Figure 8 Cross-sectional view of the E-E section in

[0045] Figure 10 is Figure 9 Partial enlarged schematic diagram at position F in

[0046] Figure 11 is Figure 1 Stereogram of the bottom plate module of the battery cell structure shown in

[0047] Figure 12 is Figure 3 Cross-sectional view of the bottom plate module of the battery cell structure shown in

[0048] Figure 13 is Figure 12 Partial enlarged schematic diagram of the plate body at position G in

[0049] Figure 14 Stereogram of the electrode group module and the housing module in the first state;

[0050] Figure 15 Cross-sectional view of the electrode group module and the housing module in the first state along the third direction;

[0051] Figure 16 is Figure 14 Stereogram of the tab unit and the connecting piece in the first state in

[0052] Figure 17 Stereogram of the electrode group module and the housing module in the second state;

[0053] Figure 18 Cross-sectional view of the electrode group module and the housing module in the second state along the third direction;

[0054] Figure 19 is Figure 17 Stereogram of the tab unit and the connecting piece in the second state in

[0055] Explanation of reference numerals:

[0056] 10. Housing module;

[0057] 11. Housing body; 111. Top wall; 1111. Welding channel; 1112. First boss portion; 112. Side wall;

[0058] 12. Terminal post;

[0059] 13. Insulating assembly; 131. First insulating member; 1311. First through hole; 1312. Second through hole; 132. Third insulating member; 133. Sealing ring;

[0060] 14. Connecting piece;

[0061] 15. Sealing plate; 151. Liquid injection hole;

[0062] 16. Second insulating member;

[0063] 20. Electrode group module; 21. Tab unit;

[0064] 30. Bottom plate module; 31. Plate body; 311. Explosion-proof port; 312. Sunk groove; 313. Second boss portion; 32. Explosion-proof valve; 33. Sealing piece. Detailed implementation manner

[0065] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0066] The following will be combined with Figures 1 to 19 , to describe the embodiments of the present utility model.

[0067] According to an embodiment of the present utility model, on the one hand, a battery cell structure is provided, including:

[0068] Housing module 10, please refer to Figure 1 as shown. The housing module 10 includes a housing body 11 and a sealing plate 15. The housing body 11 includes a top wall 111 and a side wall 112 extending from the peripheral edge of the top wall 111 in a first direction away from the top wall 111. The top wall 111 and the side wall 112 are integrally formed. Please refer to Figure 3 as shown. The side wall 112 and the top wall 111 together enclose a receiving cavity, and the receiving cavity is adapted to receive the electrode group module 20;

[0069] Please also combine Figure 1 and Figure 3As shown, the sealing plate 15 is welded to the top wall 111; a liquid injection hole 151 is formed in the sealing plate 15, and the liquid injection hole 151 communicates with the accommodation cavity;

[0070] Please refer to Figure 3 As shown, the bottom plate module 30 and the housing module 10 are independently arranged. The bottom plate module 30 and the top wall 111 are arranged opposite to each other in the first direction. The bottom plate module 30 includes a plate body 31. The plate body 31 is adapted to be welded to the side of the side wall 112 away from the top wall 111 in the first direction; an explosion-proof port 311 is formed in the plate body 31, and the explosion-proof port 311 communicates with the accommodation cavity;

[0071] The bottom plate module 30 further includes an explosion-proof valve 32. The explosion-proof valve 32 is welded to the plate body 31, and the explosion-proof valve 32 is adapted to close the explosion-proof port 311.

[0072] In the battery cell structure provided by the present utility model, by arranging a sealing plate 15 on the top wall 111 of the shell body 11, the sealing plate 15 is welded to the top wall 111, and a liquid injection hole 151 is formed in the sealing plate 15, so that electrolyte is injected into the battery cell through the liquid injection hole 151; the bottom plate module 30 and the top wall 111 are arranged opposite to each other in the first direction. By arranging an explosion-proof valve 32 on the plate body 31 of the bottom plate module 30, the explosion-proof valve 32 and the liquid injection hole 151 are respectively arranged on two sides of the battery cell housing in the first direction, avoiding the pollution of the explosion-proof valve 32 by the electrolyte during liquid injection, and improving the safety performance of the battery cell.

[0073] In some embodiments, please refer to Figure 3 As shown, the housing module 10 further includes a pole column 12, an insulating component 13 and a connecting piece 14. The pole column 12 is riveted and fixed to the top wall 111, and an insulating component 13 is arranged between the pole column 12 and the top wall 111 for insulation;

[0074] The pole group module 20 is provided with a tab unit 21 on the side facing the top wall 111 in the first direction. The tab unit 21 and the pole column 12 are staggered in the first direction, avoiding the stacking of the tab unit 21 and the pole column 12 in the first direction, reducing the space occupation of the tab unit 21 and the pole column 12 in the first direction, and improving the space utilization rate inside the battery;

[0075] The connecting piece 14 is arranged on the side of the top wall 111 facing the pole group module 20. One end of the connecting piece 14 in the third direction is adapted to be welded and fixed to the pole column 12, and the other end is adapted to be welded to the tab unit 21.

[0076] It should be noted that the housing module 10 includes a housing body 11, a terminal post 12, an insulating component 13 and a connecting piece 14. The terminal post 12 is riveted and fixed to the top wall 111. An insulating component 13 is arranged between the terminal post 12 and the top wall 111 for insulation. One end of the connecting piece 14 in the third direction is welded and fixed to the terminal post 12, so that the housing module 10 forms an integral structural module, which is convenient for the overall supply and assembly of the housing module 10 and improves the production efficiency. The sealing plate 15 is independently arranged from the housing body 11 before the battery cell is assembled. After the pole group module 20 is placed into the housing and the connecting piece 14 is welded to the tab unit 21, the sealing plate 15 is then welded to the housing body 11 to seal the welding channel 1111 through the sealing plate 15.

[0077] In some embodiments, the tab unit 21 has a first state vertically arranged in the first direction and a second state arranged at an angle to the first direction after being bent. The pole group module 20 is adapted to be placed into the housing in the first state, and the tab unit 21 is adapted to penetrate to the side of the connecting piece 14 away from the pole group module 20 in the first direction. The tab unit 21 is adapted to be welded to the connecting piece 14 in the second state.

[0078] A welding channel 1111 is formed by opening on the top wall 111. The welding channel 1111 is adapted to provide a clearance space for the bending of the tab unit 21 and the welding of the tab unit 21 to the connecting piece 14.

[0079] The sealing plate 15 seals the welding channel 1111.

[0080] It should be noted that, as shown in Figures 14 - 16 When the tab unit 21 is in the first state, the tab unit 21 is vertically arranged in the first direction, which is the initial state of the tab unit 21. As shown in Figures 17 - 19 After the pole group module 20 is placed into the housing, the tab unit 21 penetrates to the side of the connecting piece 14 away from the pole group module 20 in the first direction, and then the tab unit 21 is bent by an angle of about 90°, so that the tab unit 21 is arranged at an angle to the first direction. At this time, the tab unit 21 is in the second state, and the tab unit 21 is arranged in contact with the side of the connecting piece 14 away from the pole group module 20 in the first direction. Then, the tab unit 21 and the connecting piece 14 are welded through penetration, so that electric energy is led out of the battery through the connecting piece 14.

[0081] By forming a welding channel 1111 on the top wall 111, on the one hand, it provides an operating space for the bending of the tab unit 21, and on the other hand, it provides a welding space for the welding of the tab unit 21 and the connecting piece 14, reducing the space occupied by the tab unit 21 and the connecting piece 14 in the first direction, eliminating the bending process of the connecting piece 14, improving the internal space utilization rate of the battery, and enhancing the production efficiency; after the tab unit 21 and the connecting piece 14 are welded, the sealing plate 15 is then welded to the top wall 111, thereby closing the welding channel 1111 through the sealing plate 15 to achieve the sealing of the top wall 111. At the same time, by arranging the explosion-proof valve 32 on the plate body 31 of the bottom plate module 30, it can not only avoid the pollution of the explosion-proof valve 32 by the electrolyte during liquid injection, but also form a welding channel 1111 with a sufficient area on the top wall 111 to ensure a sufficient welding area between the connecting piece 14 and the tab unit 21, thereby improving the overcurrent capacity of the battery; the liquid injection hole 151 is opened on the sealing plate 15 instead of directly on the top wall 111, which can make the setting of the liquid injection hole 151 more flexible, avoiding affecting or compressing the area of the welding channel 1111 and avoiding affecting the welding space between the connecting piece 14 and the tab unit 21.

[0082] In some embodiments, please refer to Figure 5 As shown, the insulating assembly 13 includes a first insulating member 131. The first insulating member 131 is disposed on one side of the top wall 111 facing the electrode group module 20 in the first direction, and the first insulating member 131 is adapted to insulate between the top wall 111 and the tab unit 21;

[0083] Please also refer to Figure 10 As shown, a first through hole 1311 is formed on the first insulating member 131. The first through hole 1311 and the welding channel 1111 are disposed opposite to each other in the first direction, and the first through hole 1311 is adapted to avoid the tab unit 21.

[0084] By disposing the first insulating member 131 on one side of the top wall 111 facing the electrode group module 20 in the first direction to insulate between the top wall 111 and the tab unit 21 through the first insulating member 131, thereby avoiding internal short circuit of the battery caused by the contact between the top wall 111 and the tab unit 21; by forming a first through hole 1311 on the first insulating member 131, so that when the electrode group module 20 is put into the shell, the tab unit 21 can pass through the first through hole 1311 and extend in the first direction to the side of the connecting piece 14 away from the electrode group module 20, and then the tab unit 21 is bent, thereby realizing the welding of the tab unit 21 and the connecting piece 14; please refer to Figure 5 As shown, after the tab unit 21 and the connecting piece 14 are welded, at least a part of the tab unit 21 is built in the first through hole 1311, thereby reducing the space occupied by the tab unit 21 and the connecting piece 14 in the first direction and improving the internal space utilization rate of the battery.

[0085] Further, please refer to Figure 5 As shown, the insulation assembly 13 further includes a third insulation member 132 and a sealing ring 133. The third insulation member 132 is disposed between the riveting rib of the pole column 12 and the top wall 111, and the third insulation member 132 is adapted to insulate between the pole column 12 and the top wall 111; the sealing ring 133 is coaxially disposed with the pole column 12, and the sealing ring 133 is compressed between the pole column 12 and the top wall 111, and the sealing ring 133 is adapted to seal between the pole column 12 and the top wall 111.

[0086] In some embodiments, please refer to Figure 7 As shown, a second through hole 1312 is further formed in the first insulation member 131. The second through hole 1312 is adapted to communicate the liquid injection hole 151 with the accommodation cavity, so as to inject electrolyte into the battery cell through the liquid injection hole 151 and the second through hole 1312.

[0087] In some embodiments, please refer to Figure 5 As shown, the housing module 10 further includes a second insulation member 16. The second insulation member 16 is disposed on one side of the sealing plate 15 facing the pole group module 20 along the first direction, and the second insulation member 16 is adapted to insulate between the sealing plate 15 and the pole ear unit 21, so as to avoid internal short circuit of the battery caused by contact between the sealing plate 15 and the pole ear unit 21.

[0088] In some embodiments, please refer to Figure 5 and Figure 10 As shown, the top wall 111 includes a first boss portion 1112. The first boss portion 1112 is circumferentially disposed around the inner peripheral wall of the welding channel 1111, and the first boss portion 1112 is adapted to support the sealing plate 15.

[0089] In this embodiment, by providing the first boss portion 1112 on the top wall 111, the sealing plate 15 is supported by the first boss portion 1112, so as to avoid the displacement of the sealing plate 15, ensure the welding yield between the sealing plate 15 and the top wall 111, and thus ensure the connection strength and sealing performance between the sealing plate 15 and the top wall 111.

[0090] In some embodiments, please refer to Figure 12 and Figure 13 As shown, a sinking groove 312 is formed on one side of the plate body 31 facing the pole group module 20 along the first direction, and the explosion-proof valve 32 is adapted to be received in the sinking groove 312;

[0091] The plate body 31 includes a second boss portion 313, and the second boss portion 313 is adapted to support the explosion-proof valve 32.

[0092] In this embodiment, by forming a counterbore 312 on one side of the plate body 31 facing the electrode group module 20 along the first direction, the explosion-proof valve 32 is installed in the counterbore 312, reducing the space occupied by the explosion-proof valve 32 in the first direction and improving the space utilization rate inside the battery; by providing a second boss portion 313 on the plate body 31, the explosion-proof valve 32 is supported by the second boss portion 313 to prevent the explosion-proof valve 32 from shifting, ensuring the welding yield between the explosion-proof valve 32 and the plate body 31, and thus guaranteeing the connection strength and sealing performance between the explosion-proof valve 32 and the plate body 31.

[0093] In some embodiments, referring to Figure 3 and Figure 6 as shown, the bottom plate module 30 further includes a sealing sheet 33. The sealing sheet 33 is disposed on the side of the plate body 31 away from the electrode group module 20 along the first direction. The sealing sheet 33 is adapted to seal the explosion-proof port 311, thereby preventing foreign matter from contaminating and / or damaging the explosion-proof valve 32, ensuring the normal working performance of the explosion-proof valve 32, and improving the safety of the battery.

[0094] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: an electrode group module 20, and the cell structure as described above.

[0095] The battery in this embodiment includes the cell structure as described above. Therefore, the battery in this embodiment includes all the beneficial effects of the cell structure as described above.

[0096] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell structure, characterized in that: include: The housing module comprises a housing body and a sealing plate, wherein the housing body comprises a top wall and a side wall extending from a peripheral side edge of the top wall in a first direction away from the top wall, wherein the side wall and the top wall together enclose a receiving cavity, and the receiving cavity is suitable for receiving a pole group module; The sealing plate is welded to the top wall; a liquid injection hole is provided on the sealing plate, and the liquid injection hole is communicated with the accommodating cavity; A bottom plate module is arranged opposite to the top wall along a first direction, and the bottom plate module includes a plate body, and the plate body is suitable for being welded to a side of the side wall away from the top wall along the first direction; an explosion-proof opening is opened on the plate body, and the explosion-proof opening is connected to the accommodating cavity; The base plate module further comprises an explosion-proof valve, which is welded to the plate body and is suitable for closing the explosion-proof opening.

2. The battery cell structure according to claim 1, characterized in that: The housing module further comprises a pole, an insulating assembly and a connecting sheet, the pole is fixed to the top wall by riveting, and the insulating assembly is arranged between the pole and the top wall for insulation; The pole group module is provided with a pole ear unit on one side facing the top wall along the first direction, and the pole ear unit is staggered and aligned with the pole along the first direction; The connecting piece is arranged on a side of the top wall facing the pole group module, and one end of the connecting piece in the third direction is suitable for being welded and fixed to the pole column, and the other end is suitable for being welded to the pole lug unit.

3. The battery cell structure according to claim 2, characterized in that: The pole lug unit has a first state in which it is vertically arranged along a first direction and a second state in which it is arranged at an angle to the first direction after being bent; the pole group module is suitable for being put into the shell in the first state, and the pole lug unit is suitable for extending along the first direction to the side of the connecting piece away from the pole group module in the first state; the pole lug unit is suitable for being welded with the connecting piece in the second state; A welding channel is formed on the top wall, and the welding channel is suitable for providing an escape space for the bending of the tab unit and the welding of the tab unit and the connecting sheet; The sealing plate closes the welding channel.

4. The battery cell structure according to claim 3, characterized in that: The insulating assembly comprises a first insulating member, which is arranged on a side of the top wall facing the pole group module along a first direction, and is suitable for insulating the top wall from the pole lug unit; The first insulating member is provided with a first through hole, the first through hole and the welding channel are arranged opposite to each other along a first direction, and the first through hole is suitable for avoiding the tab unit.

5. The battery cell structure according to claim 4, characterized in that: The first insulating member is also provided with a second through hole, and the second through hole is suitable for connecting the injection hole with the accommodating cavity.

6. The battery cell structure according to claim 4, characterized in that: The housing module further comprises a second insulating member, which is arranged on a side of the sealing plate facing the pole group module along the first direction, and is suitable for insulating the sealing plate from the pole lug unit.

7. The battery cell structure according to claim 4, characterized in that: The top wall includes a first boss portion, which is circumferentially arranged around the inner peripheral wall of the welding channel, and the first boss portion is suitable for supporting the sealing plate.

8. The battery core structure according to any one of claims 1 to 7, characterized in that: A sink groove is formed on one side of the plate body along the first direction toward the pole group module, and the sink groove is suitable for accommodating the explosion-proof valve; The plate body includes a second boss portion, and the second boss portion is suitable for supporting the explosion-proof valve.

9. The battery cell structure according to claim 8, characterized in that: The base plate module further comprises a sealing sheet, which is arranged on a side of the plate body away from the pole group module, and is suitable for sealing the explosion-proof opening.

10. A battery, characterized in that: include: A pole group module, and a battery cell structure as claimed in any one of claims 1 to 9.

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