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 cover plate module, the cover plate module comprises a cover plate body, a pole and an insulation assembly, the pole is riveted and fixed with the cover plate body, and the insulation assembly is arranged between the pole and the cover plate body for insulation; a pole lug unit is arranged on one side of the pole group module in the first direction, and the pole lug unit and the pole column are staggered and aligned in the first direction; the tab unit has a first state in which the tab unit is vertically arranged along the first direction and a second state in which an angle is formed between the tab unit and the first direction after the tab unit is bent; the cover plate module further comprises a connecting piece, the connecting piece is arranged on the side, facing the pole group module, of the cover plate body, the connecting piece comprises a first connecting part and a second connecting part, and the first connecting part is suitable for being welded and fixed to the pole column; and the tab unit is suitable for being welded with the second connecting part in the second state. According to the battery cell structure provided by the utility model, not only is the space utilization rate in the battery improved, but also the production efficiency is improved.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries 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 electrical energy is led out to the outside of the battery through a connecting piece between the electrode assembly and the cover plate. After the connecting piece is welded to the tab of the electrode assembly, the connecting piece needs to be bent, which not only reduces the space utilization rate inside the battery, but also reduces the production efficiency. 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 in the existing lithium-ion battery, the connecting piece needs to be bent during the manufacturing process, which not only reduces the space utilization rate inside the battery, but also reduces the production efficiency.

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

[0006] A cover plate module, including a cover plate body, a pole column and an insulating component. The pole column is riveted and fixed to the cover plate body, and an insulating component is arranged between the pole column and the cover plate body for insulation;

[0007] An electrode assembly module, on one side in a first direction, there is a tab unit, and the tab unit is offset and aligned with the pole column in the first direction; the tab unit has a first state vertically arranged in the first direction and a second state arranged at an angle with the first direction after being bent;

[0008] The cover plate module further includes a connecting piece, the connecting piece is arranged on the side of the cover plate body facing the electrode assembly module, the connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is adapted to be welded and fixed to the pole column; the second connecting portion extends from the first connecting portion in a third direction towards the tab unit, and the tab unit is adapted to be welded to the second connecting portion in the second state.

[0009] Beneficial effects: For the battery cell structure provided by the present utility model, on the one hand, the connecting piece, the cover plate body, the pole column and the insulating component pre-form a cover plate module with an integral structure, and the cover plate module is supplied as a whole, which is convenient for assembly, avoids the welding of the connecting piece and the pole column in the subsequent manufacturing process, and is beneficial to improving production efficiency; on the other hand, the tab unit and the pole column are offset in alignment along the first direction. By providing a connecting piece, the first connecting portion of the connecting piece is welded and fixed to the pole column, and the tab unit is welded to the second connecting portion of the connecting piece in the second state, reducing the space occupied by the tab unit and the pole column in the first direction; on the further hand, in the above manufacturing process, there is no need to bend the connecting piece, which not only improves the space utilization rate inside the battery, but also improves production efficiency.

[0010] In an alternative embodiment, a welding channel is formed on the cover plate body, and the welding channel is adapted to provide an assembly avoidance space for the tab unit and the second connecting portion;

[0011] The cover plate module further includes a sealing plate, the sealing plate is welded to the cover plate body, and the sealing plate is adapted to close the welding channel.

[0012] Beneficial effects: By forming a welding channel on the cover plate body, on the one hand, it provides an operating space for the bending of the tab unit, and on the other hand, it provides a welding space for the welding of the tab unit and the connecting piece, reducing the space occupied by the tab unit and the connecting piece in the first direction, eliminating the bending process of the connecting piece, improving the space utilization rate inside the battery, and improving production efficiency; after the tab unit and the connecting piece are welded, the sealing plate is then welded to the cover plate body, thereby closing the welding channel through the sealing plate to achieve cover plate sealing.

[0013] In an alternative embodiment, the cover plate body includes a first boss portion, the first boss portion is circumferentially arranged around the inner peripheral wall of the welding channel, and the first boss portion is adapted to support the sealing plate.

[0014] Beneficial effects: The sealing plate is supported by the first boss portion to prevent the sealing plate from shifting, ensuring the welding yield between the sealing plate and the cover plate body, thereby guaranteeing the connection strength and sealing performance between the sealing plate and the cover plate body.

[0015] In an alternative embodiment, an explosion-proof port is formed on the sealing plate; the cover plate module further includes an explosion-proof valve, the explosion-proof valve is welded to the sealing plate, and the explosion-proof valve is adapted to close the explosion-proof port;

[0016] A liquid injection hole is further formed on the sealing plate, and the liquid injection hole and the explosion-proof port are spaced apart along the third direction.

[0017] Beneficial effects: By arranging the explosion-proof port and the liquid injection hole on the sealing plate at the same time, the arrangement of the explosion-proof port and the liquid injection hole is more flexible, avoiding affecting or compressing the area of the welding channel due to opening the explosion-proof port and / or the liquid injection hole on the cover plate body, thereby ensuring sufficient welding space between the tab unit and the connecting piece and sufficient current-carrying area between the tab unit and the connecting piece.

[0018] In an alternative embodiment, the insulating assembly includes a first insulating member disposed on one side of the cover plate body facing the electrode group module along the first direction, and the first insulating member is adapted to insulate between the cover plate body and the tab unit.

[0019] An avoidance through-hole is formed in the first insulating member, and the avoidance through-hole is disposed opposite to the welding channel along the first direction, and the avoidance through-hole is adapted to avoid the tab unit.

[0020] Beneficial effects: The first insulating member insulates between the cover plate body and the tab unit, thereby avoiding internal short circuit of the battery caused by contact between the cover plate body and the tab unit; by forming an avoidance through-hole in the first insulating member, it is convenient for the tab unit to pass through the avoidance through-hole when the electrode group module is put into the shell and extend along the first direction to the side of the connecting piece away from the electrode group module, so as to realize the welding of the tab unit and the connecting piece.

[0021] In an alternative embodiment, the tab unit includes a first tab and a second tab, the first tab and the second tab are spaced apart from each other along the second direction, and the first tab and the second tab are adapted to pass through the avoidance through-hole and the welding channel along the first direction in the first state.

[0022] A second connecting portion is disposed between the first tab and the second tab, and the second connecting portion includes a first welding area and a second welding area; the first tab is adapted to be welded to the first welding area in the second state, and the second tab is adapted to be welded to the second welding area in the second state.

[0023] Beneficial effects: The connecting piece includes a first connecting portion and a second connecting portion. The connecting piece is fixedly welded to the pole column through the first connecting portion. After the electrode group module is put into the shell, the first tab and the second tab extend along the first direction to the side of the second connecting portion away from the electrode group module. The second connecting portion is located between the first tab and the second tab. Then, the first tab and the second tab are bent to the second state, and finally the first tab is welded to the first welding area and the second tab is welded to the second welding area, without bending the connecting piece, which not only improves the space utilization rate inside the battery, but also improves the production efficiency.

[0024] In an alternative embodiment, the first insulating member includes a first recessed portion, which is recessed from the first insulating member along the first direction away from the cover plate body, and the first recessed portion is spaced apart from the sealing plate along the first direction to form an exhaust channel.

[0025] The first recess is provided with an exhaust through hole, and the exhaust through hole is disposed opposite to the explosion-proof port along the first direction.

[0026] Advantageous effects: An exhaust passage is formed by spacing the first recess from the sealing plate to ensure sufficient exhaust space near the explosion-proof port; by providing an exhaust through hole in the first recess, the thermal runaway gas inside the battery is guided to the explosion-proof port through the exhaust through hole, so that the explosion-proof valve can detonate in time when the internal pressure of the battery is abnormal.

[0027] In an alternative embodiment, the cover body further includes a second boss portion, and the second boss portion is disposed on one side of the cover body facing the first insulating member along the first direction;

[0028] The first insulating member further includes a second recess, and the second recess is disposed opposite to the second boss portion; a groove is formed by enclosing the side of the second recess facing the cover body along the first direction, and the second boss portion is adapted to be installed in the groove.

[0029] Advantageous effects: By matching the second boss portion with the groove, it is convenient to position the first insulating member and the cover body.

[0030] In an alternative embodiment, the cell structure further includes a second insulating member, and the second insulating member is disposed on one side of the sealing plate facing the electrode group module along the first direction, and the second insulating member is adapted to insulate between the sealing plate and the tab unit.

[0031] Advantageous effects: Thus, it is avoided that the internal short circuit of the battery is caused by the contact between the sealing plate and the tab unit.

[0032] In a second aspect, the present invention further provides a battery, including: a housing, and the cell structure as described above.

[0033] 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

[0034] 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.

[0035] Figure 1 A perspective view of a cell structure according to an embodiment of the present invention;

[0036] Figure 2 For Figure 1Top view of the shown battery cell structure;

[0037] Figure 3 is Figure 2 a cross-sectional view of the A-A section in;

[0038] Figure 4 a partial enlarged schematic view at position B in 3;

[0039] Figure 5 a partial enlarged schematic view at position C in 3;

[0040] Figure 6 a perspective view of the cover module of a battery cell structure according to an embodiment of the present invention;

[0041] Figure 7 is Figure 3 a cross-sectional view of the cover module in;

[0042] Figure 8 is Figure 7 a partial enlarged schematic view at position D in;

[0043] Figure 9 a perspective view of the battery cell structure with the housing hidden in the first state;

[0044] Figure 10 a cross-sectional view of the battery cell structure in the first state along the third direction;

[0045] Figure 11 a perspective view of the tab unit and the connecting piece of the battery cell structure in the first state;

[0046] Figure 12 a perspective view of the battery cell structure with the housing hidden in the second state;

[0047] Figure 13 a cross-sectional view of the battery cell structure in the second state along the third direction;

[0048] Figure 14 a perspective view of the tab unit and the connecting piece of the battery cell structure in the second state.

[0049] Explanation of reference numerals:

[0050] 10. Cover module;

[0051] 11. Cover body; 111. Welding channel; 112. First boss part; 113. Second boss part;

[0052] 12. Terminal;

[0053] 13. Insulating component; 131. First insulating part; 1311. Avoidance through-hole; 1312. First recess; 1313. Exhaust passage; 1314. Exhaust through-hole; 1315. Second recess; 1316. Groove; 132. Third insulating part; 133. Sealing ring;

[0054] 14. Connecting piece; 141. First connecting part; 142. Second connecting part; 1421. First welding area; 1422. Second welding area;

[0055] 15. Sealing plate; 151. Explosion-proof port; 152. Liquid injection hole;

[0056] 16. Explosion-proof valve;

[0057] 17. Second insulating part;

[0058] 18. Sealing piece;

[0059] 20. Electrode group module; 21. Tab unit; 211. First tab; 212. Second tab;

[0060] 30. Housing. Detailed implementation manners

[0061] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0062] The following combines Figures 1 to 14 , and describes the embodiments of the present utility model.

[0063] According to an embodiment of the present utility model, on the one hand, a battery cell structure is provided, including:

[0064] Cover plate module 10, as shown in Figure 3 , includes a cover plate body 11, two pole columns 12, and an insulating component 13. The pole columns 12 are riveted and fixed to the cover plate body 11, and an insulating component 13 is provided between the pole columns 12 and the cover plate body 11 for insulation;

[0065] Electrode group module 20, on one side in the first direction, there is a tab unit 21, still referring to Figure 3As shown, the tab unit 21 is offset from the terminal post 12 in the first direction, avoiding the stacking of the tab unit 21 and the terminal post 12 in the first direction, reducing the space occupied by the tab unit 21 and the terminal post 12 in the first direction, and improving the space utilization rate inside the battery; the tab unit 21 has a first state vertically arranged in the first direction and a second state arranged at an angle with the first direction after being bent.

[0066] The cover plate module 10 further includes a connecting piece 14, please refer to Figure 10 As shown, the connecting piece 14 is arranged on the side of the cover plate body 11 facing the electrode group module 20. The connecting piece 14 includes a first connecting portion 141 and a second connecting portion 142. The first connecting portion 141 is suitable for being welded and fixed to the terminal post 12; the second connecting portion 142 extends from the first connecting portion 141 in the third direction towards the tab unit 21, and the tab unit 21 is suitable for being welded to the second connecting portion 142 in the second state.

[0067] It should be noted that, please refer to Figure 7 As shown, the cover plate module 10 includes a cover plate body 11, two terminal posts 12, an insulating component 13 and a connecting piece 14. The terminal posts 12 are riveted and fixed to the cover plate body 11, and an insulating component 13 is arranged between the terminal posts 12 and the cover plate body 11 for insulation. The first connecting portion 141 of the connecting piece 14 is welded and fixed to the terminal post 12, so that the cover plate module 10 forms an integral structural module, which is convenient for the overall supply and assembly of the cover plate module 10 and improves the production efficiency. Please refer to Figures 9 - 11 As shown, 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; please refer to Figures 12 - 14 As shown, after the electrode group module 20 is put into the shell, the cover plate body 11 is assembled with the shell 30 and welded. At the same time, the tab unit 21 has penetrated to the side of the connecting piece 14 far from the electrode group module 20 in the first direction. At this time, after the tab unit 21 is bent by about 90°, the tab unit 21 is arranged at an angle with the first direction. At this time, the tab unit 21 is in the second state, and the tab unit 21 is attached to the side of the connecting piece 14 far from the electrode group module 20 in the first direction. Then the tab unit 21 and the connecting piece 14 are penetrated and welded, so as to lead the electric energy out of the battery through the connecting piece 14.

[0068] The cell structure provided by the present utility model, on the one hand, the connecting piece 14, the cover body 11, the pole column 12 and the insulating component 13 form a cover module 10 with an integral structure in advance, and the cover module 10 is supplied as a whole, which is convenient for assembly, avoids the welding of the connecting piece 14 and the pole column 12 in the subsequent process, and is beneficial to improving the production efficiency; on the other hand, the tab unit 21 and the pole column 12 are offset in alignment along the first direction. By providing the connecting piece 14, the first connecting portion 141 of the connecting piece 14 is welded and fixed to the pole column 12, and the tab unit 21 is welded to the second connecting portion 142 of the connecting piece 14 in the second state, reducing the space occupied by the tab unit 21 and the pole column 12 in the first direction; on the other hand, in the above process, there is no need to bend the connecting piece 14, which not only improves the space utilization rate inside the battery, but also improves the production efficiency.

[0069] In some embodiments, please refer to Figure 6 and Figure 7 As shown, a welding channel 111 is formed on the cover body 11, and the welding channel 111 is adapted to provide an assembly avoidance space for the tab unit 21 and the second connecting portion 142;

[0070] Please also refer to Figures 1 - 3 As shown, the cover module 10 further includes a sealing plate 15, the sealing plate 15 is welded to the cover body 11, and the sealing plate 15 is adapted to seal the welding channel 111.

[0071] By forming the welding channel 111 on the cover body 11, 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 space utilization rate inside the battery, and improving the production efficiency; after the tab unit 21 and the connecting piece 14 are welded, the sealing plate 15 is then welded to the cover body 11, so as to seal the welding channel 111 through the sealing plate 15 to achieve cover sealing.

[0072] Furthermore, laser welding or ultrasonic welding can be adopted between the tab unit 21 and the connecting piece 14.

[0073] In some embodiments, please refer to Figure 8 As shown, the cover body 11 includes a first boss portion 112, and the first boss portion 112 is circumferentially arranged around the inner peripheral wall of the welding channel 111. Please also refer to Figure 5 As shown, the first boss portion 112 is adapted to support the sealing plate 15.

[0074] In this embodiment, by providing a first boss portion 112 on the cover body 11, the sealing plate 15 is supported by the first boss portion 112 to prevent the sealing plate 15 from shifting, ensuring the welding yield between the sealing plate 15 and the cover body 11, and thus guaranteeing the connection strength and sealing performance between the sealing plate 15 and the cover body 11.

[0075] In some embodiments, please refer to Figure 4 As shown, an explosion-proof port 151 is provided on the sealing plate 15; the cover module 10 further includes an explosion-proof valve 16, the explosion-proof valve 16 is welded to the sealing plate 15, and the explosion-proof valve 16 is adapted to close the explosion-proof port 151;

[0076] Please also refer to Figure 1 and Figure 2 As shown, a liquid injection hole 152 is further provided on the sealing plate 15, and the liquid injection hole 152 and the explosion-proof port 151 are arranged at intervals in the third direction.

[0077] In this embodiment, by providing the explosion-proof port 151 and the liquid injection hole 152 on the sealing plate 15 at the same time, the arrangement of the explosion-proof port 151 and the liquid injection hole 152 is more flexible, avoiding affecting or compressing the area of the welding channel 111 due to providing the explosion-proof port 151 and / or the liquid injection hole 152 on the cover body 11, thus ensuring sufficient welding space between the tab unit 21 and the connecting piece 14, ensuring sufficient welding area between the tab unit 21 and the connecting piece 14, and further ensuring sufficient current-carrying area between the tab unit 21 and the connecting piece 14.

[0078] Further, the explosion-proof valve 16 is arranged on one side of the sealing plate 15 facing the electrode group module 20 along the first direction.

[0079] Further, the cover module 10 further includes a sealing piece 18, the sealing piece 18 is arranged on one side of the sealing plate 15 away from the electrode group module 20 along the first direction, the sealing piece 18 and the explosion-proof valve 16 are arranged opposite to each other along the first direction, and the sealing piece 18 is adapted to seal the explosion-proof port 151, thereby isolating the explosion-proof valve 16 from the outside through the sealing piece 18 to prevent foreign matter from contaminating or damaging the explosion-proof valve 16.

[0080] 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 arranged on one side of the cover body 11 facing the electrode group module 20 along the first direction, and the first insulating member 131 is adapted to insulate between the cover body 11 and the tab unit 21;

[0081] Please refer to Figure 4 and Figure 8As shown, an avoidance through-hole 1311 is formed in the first insulating member 131. The avoidance through-hole 1311 and the welding channel 111 are arranged opposite to each other in the first direction. The avoidance through-hole 1311 is adapted to avoid the tab unit 21.

[0082] By providing the first insulating member 131 on one side of the cover body 11 facing the electrode group module 20 in the first direction, the first insulating member 131 is used to insulate between the cover body 11 and the tab unit 21, thereby avoiding internal short circuit of the battery caused by contact between the cover body 11 and the tab unit 21. By forming the avoidance through-hole 1311 in the first insulating member 131, when the electrode group module 20 is inserted into the housing, the tab unit 21 can pass through the avoidance through-hole 1311 and extend in the first direction to the side of the connecting piece 14 away from the electrode group module 20, thereby realizing the welding of the tab unit 21 and the connecting piece 14.

[0083] Further, please refer to Figure 5 As shown, the insulating assembly 13 further includes a third insulating member 132 and a sealing ring 133. The third insulating member 132 is disposed between the riveting rib of the pole column 12 and the cover body 11. The third insulating member 132 is adapted to insulate between the pole column 12 and the cover body 11. The sealing ring 133 is coaxially arranged with the pole column 12. The sealing ring 133 is compressed between the pole column 12 and the cover body 11. The sealing ring 133 is adapted to seal between the pole column 12 and the cover body 11.

[0084] In some embodiments, please also refer to Figure 10 and Figure 11 As shown, the tab unit 21 includes a first tab 211 and a second tab 212. The first tab 211 and the second tab 212 are spaced apart from each other in the second direction. The first tab 211 and the second tab 212 are adapted to pass through the avoidance through-hole 1311 and the welding channel 111 in the first direction in the first state.

[0085] Please refer to Figure 11 As shown, the second connecting portion 142 is disposed between the first tab 211 and the second tab 212. The second connecting portion 142 includes a first welding area 1421 and a second welding area 1422. Please also refer to Figure 14 As shown, the first tab 211 is adapted to be welded to the first welding area 1421 in the second state, and the second tab 212 is adapted to be welded to the second welding area 1422 in the second state.

[0086] It should be noted that, please refer to Figure 11 and Figure 14As shown, the electrode group module 20 may be composed of two electrode group monomers. The two electrode group monomers are arranged oppositely along the second direction. A first tab 211 is provided on one of the electrode group monomers, and a second tab 212 is provided on the other electrode group monomer. The first tab 211 and the second tab 212 together form a tab unit 21.

[0087] In this embodiment, the connecting piece 14 includes a first connecting portion 141 and a second connecting portion 142. The connecting piece 14 is fixedly welded to the pole column 12 through the first connecting portion 141. After the electrode group module 20 is put into the shell, the first tab 211 and the second tab 212 extend along the first direction to the side of the second connecting portion 142 away from the electrode group module 20. The second connecting portion 142 is located between the first tab 211 and the second tab 212. Then, the first tab 211 and the second tab 212 are bent to the second state. Finally, the first tab 211 is welded to the first welding area 1421, and the second tab 212 is welded to the second welding area 1422. There is no need to bend the connecting piece 14, which not only improves the space utilization rate inside the battery, but also improves the production efficiency.

[0088] In some embodiments, please refer to Figure 4 As shown, the first insulating member 131 includes a first recessed portion 1312. The first recessed portion 1312 is formed by the first insulating member 131 recessing along the first direction away from the cover plate body 11. The first recessed portion 1312 and the sealing plate 15 are spaced apart along the first direction and form an exhaust passage 1313.

[0089] Please refer to Figure 6 As shown, the first recessed portion 1312 is provided with an exhaust through hole 1314. The exhaust through hole 1314 is arranged oppositely to the explosion-proof port 151 along the first direction.

[0090] In this embodiment, by providing the first recessed portion 1312 on the first insulating member 131, the first recessed portion 1312 and the sealing plate 15 are spaced apart to form an exhaust passage 1313 to ensure sufficient exhaust space near the explosion-proof port 151. By providing the exhaust through hole 1314 in the first recessed portion 1312, the thermal runaway gas inside the battery is guided to the explosion-proof port 151 through the exhaust through hole 1314, so that the explosion-proof valve 16 can be detonated in time when the internal pressure of the battery is abnormal.

[0091] In some embodiments, please refer to Figure 5 As shown, the cover plate body 11 further includes a second boss portion 113. The second boss portion 113 is provided on the side of the cover plate body 11 along the first direction facing the first insulating member 131.

[0092] The first insulating member 131 further includes a second recessed portion 1315 which is disposed opposite to the second boss portion 113; the second recessed portion 1315 encloses a groove 1316 along one side of the cover plate body 11 in the first direction, and the second boss portion 113 is adapted to be installed in the groove 1316.

[0093] In this embodiment, by the cooperation of the second boss portion 113 and the groove 1316, it is convenient to position the first insulating member 131 and the cover plate body 11.

[0094] In some embodiments, please also refer to Figure 3 and Figure 4 As shown, the battery cell structure further includes a second insulating member 17 which is disposed on one side of the sealing plate 15 facing the electrode group module 20 in the first direction. The second insulating member 17 is adapted to insulate between the sealing plate 15 and the tab unit 21, so as to avoid internal short circuit of the battery caused by the contact between the sealing plate 15 and the tab unit 21.

[0095] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: a housing 30, and the battery cell structure as described above.

[0096] The battery in this embodiment includes the battery cell structure as described above. Therefore, the battery in this embodiment includes all the beneficial effects of the battery cell structure as described above.

[0097] Furthermore, the bottom wall and the side wall of the housing 30 jointly enclose a receiving cavity for receiving the electrode group module 20, and the housing 30 is welded to the cover plate body 11.

[0098] Although the embodiments of the present invention are 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 all fall within the scope defined by the appended claims.

Claims

1. A battery cell structure, characterized in that: include: The cover plate module comprises a cover plate body, a pole and an insulating component, wherein the pole is fixed to the cover plate body by riveting, and the insulating component is arranged between the pole and the cover plate body for insulation; The pole group module has a pole lug unit disposed on one side in the first direction, the pole lug unit and the pole column are offset and aligned along the first direction; the pole lug unit has a first state of being vertically disposed along the first direction and a second state of being bent and disposed at an angle to the first direction; The cover plate module also includes a connecting piece, which is arranged on the side of the cover plate body facing the pole group module, and the connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is suitable for being welded and fixed to the pole; the second connecting portion is formed by extending the first connecting portion along a third direction toward the pole ear unit, and the pole ear unit is suitable for being welded to the second connecting portion in the second state.

2. The battery cell structure according to claim 1, characterized in that: A welding channel is provided on the cover plate body, and the welding channel is suitable for providing an escape space for assembling the tab unit and the second connecting portion; The cover plate module further comprises a sealing plate, wherein the sealing plate is welded to the cover plate body and is suitable for sealing the welding channel.

3. The battery cell structure according to claim 2, characterized in that: The cover plate body 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.

4. The battery cell structure according to claim 2, characterized in that: The sealing plate is provided with an explosion-proof opening; the cover plate module further comprises an explosion-proof valve, the explosion-proof valve is welded to the sealing plate, and the explosion-proof valve is suitable for closing the explosion-proof opening; The sealing plate is also provided with a liquid injection hole, and the liquid injection hole and the explosion-proof opening are spaced apart along the third direction.

5. The battery cell structure according to claim 4, characterized in that: The insulating assembly comprises a first insulating member, which is arranged on a side of the cover body along a first direction toward the pole group module, and is suitable for insulating the cover body from the pole lug unit; The first insulating member is provided with an avoidance through hole, the avoidance through hole is arranged opposite to the welding channel along a first direction, and the avoidance through hole is suitable for avoiding the tab unit.

6. The battery cell structure according to claim 5, characterized in that: The pole lug unit comprises a first pole lug and a second pole lug, the first pole lug and the second pole lug are arranged oppositely and spaced apart along a second direction, and the first pole lug and the second pole lug are suitable for passing through the avoidance through hole and the welding channel along the first direction in the first state; The second connection portion is arranged between the first pole tab and the second pole tab, and the second connection portion includes a first welding area and a second welding area; the first pole tab is suitable for welding with the first welding area in the second state, and the second pole tab is suitable for welding with the second welding area in the second state.

7. The battery cell structure according to claim 5, characterized in that: The first insulating member includes a first recessed portion, the first recessed portion is formed by the first insulating member being recessed along a first direction away from the cover plate body, the first recessed portion and the sealing plate are spaced apart along the first direction and form an exhaust channel; The first recessed portion is provided with an exhaust through hole, and the exhaust through hole and the explosion-proof opening are arranged opposite to each other along a first direction.

8. The battery cell structure according to claim 5, characterized in that: The cover body further includes a second boss portion, and the second boss portion is arranged on one side of the cover body along the first direction toward the first insulating member; The first insulating member further includes a second recessed portion, which is arranged opposite to the second boss portion; the second recessed portion is enclosed along the first direction toward one side of the cover body to form a groove, and the groove is suitable for installing the second boss portion.

9. The battery core structure according to any one of claims 2 to 8, characterized in that: The cell structure further includes a second insulating member, which is disposed on a side of the sealing plate along the first direction toward the pole group module, and is suitable for insulating the sealing plate from the pole lug unit.

10. A battery, characterized in that: The invention comprises: a shell, and a battery core structure as claimed in any one of claims 1 to 9.

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