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CN-224232750-U - Battery cell, battery device and electricity utilization device

CN224232750UCN 224232750 UCN224232750 UCN 224232750UCN-224232750-U

Abstract

The application belongs to the technical field of battery production, and provides a battery unit, a battery device and an electric device, wherein the battery unit comprises a shell, an explosion-proof valve, an electrode assembly and an insulating piece; the explosion-proof valve is arranged on the shell, the electrode assembly is arranged in the accommodating cavity and provided with a first end face and a lug protruding on the first end face, the lug is arranged on the first side of the first end face and provided with a lug edge far away from the first side, the insulating piece is arranged in the accommodating cavity and arranged between the first end face and the shell and comprises an insulating pad and a boss, the insulating pad is provided with a first surface opposite to the first end face, the boss is protruding on the first surface towards the first end face, the boss is provided with a flow guide channel, the flow guide channel is communicated with the accommodating cavity and the explosion-proof valve, and the boss is arranged with the lug edge along the first direction and provided with a first interval distance so that the lug and the boss are arranged in a dodging mode. The application aims to reduce the risk of interference with the boss caused by dislocation of the tab.

Inventors

  • CHEN SHOUBO
  • XIE YONGFENG
  • XING CHENGYOU

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250325

Claims (18)

  1. 1. A battery cell (1110), comprising: a housing (1111) having a receiving chamber (11111); An explosion-proof valve (1113) mounted on the casing (1111); An electrode assembly (1115) accommodated in the accommodating cavity (11111), wherein the electrode assembly (1115) is provided with a first end surface (11151) and a tab (11152) protruding on the first end surface (11151), the first end surface (11151) is provided with a first side (11154), the tab (11152) is configured on the first side (11154) and is provided with a tab edge (11153) far away from the first side (11154) along a first direction (X); The insulation piece (1114) is accommodated in the accommodating cavity (11111) and is configured between the first end face (11151) and the shell (1111), the insulation piece (1114) comprises an insulation pad (11141) and a boss (11142), the insulation pad (11141) is provided with a first surface (111411) opposite to the first end face (11151), the boss (11142) protrudes towards the first end face (11151) and is arranged on the first surface (111411), a diversion channel (11143) is formed in the boss (11142), the diversion channel (11143) is communicated with the accommodating cavity (11111) and the explosion-proof valve (1113), and the boss (11142) is configured to be provided with a first separation distance (L1) with a lug edge (11153) along the first direction (X), so that the lug (11152) is configured to be avoided from the boss (11142).
  2. 2. The battery cell (1110) of claim 1 wherein, along the first direction (X), the boss (11142) is configured to have a second separation distance (L2) from the first side (11154), the second separation distance (L2) being greater than a width of the tab (11152) along the first direction (X).
  3. 3. The battery cell (1110) of claim 1 or 2, wherein in a first direction (X), the first end face (11151) further has a second side (11159) opposite the first side (11154), the tab (11152) comprises a first ear (11155) and a second ear (11156), the first ear (11155) is disposed on the first side (11154) and has a first tab edge remote from the first side (11154), the second ear (11156) is disposed on the second side (11159) and has a second tab edge remote from the second side (11159), and the boss (11142) is disposed at the first separation distance (L1) from both the first tab edge and the second tab edge.
  4. 4. The battery cell (1110) of claim 3 wherein, along the first direction (X), the boss (11142) is configured to have a second spacing distance (L2) from the first side (11154), the second spacing distance (L2) being greater than a width of the first ear (11155) along the first direction (X), and wherein, along the first direction (X), the boss (11142) is configured to have a second spacing distance (L2) from the second side (11159), the second spacing distance (L2) being greater than a width of the second ear (11156) along the first direction (X).
  5. 5. The battery cell (1110) of claim 1 or 2, wherein the first separation distance (L1) ranges from 0mm to 5mm.
  6. 6. The battery cell (1110) of claim 1 or 2, wherein a projection plane is provided perpendicular to a first direction (X), and wherein projections of the boss (11142) and the tab (11152) on the projection plane are arranged at intervals along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X).
  7. 7. The battery cell (1110) of claim 1 or 2, wherein a projection plane is provided perpendicular to the first direction (X), wherein projections of the boss (11142) and the tab (11152) on the projection plane have overlapping portions, and wherein the first separation distance (L1) is greater than 0mm.
  8. 8. The battery cell (1110) of claim 1 or 2, wherein the boss (11142) has a first length in a second direction (Y) in a plane parallel to the first end face (11151), the boss (11142) having a second length in the first direction (X), the first length being greater than the second length, the second direction (Y) being perpendicular to the first direction (X).
  9. 9. The battery cell (1110) of claim 1 or 2, wherein the boss (11142) has a central region (111421) and end regions (111422) connected to the central region (111421) in a plane parallel to the first end face (11151), the end regions (111422) being disposed adjacent to the tab (11152), in a second direction (Y) in which the width of the end regions (111422) is less than the width of the central region (111421), the second direction (Y) being perpendicular to the first direction (X).
  10. 10. The battery cell (1110) of claim 9 wherein, in the second direction (Y), the width of the boss (11142) tapers from the middle region (111421) toward a direction away from the middle region (111421).
  11. 11. The battery cell (1110) of claim 1, wherein the tab (11152) includes a positive tab (11157) and a negative tab (11158) each protruding from the first end surface (11151), the insulator (1114) further includes a partition member (1116) connected to the insulating pad (11141), and the partition member (1116) is protruding from the first surface (111411) and disposed between the positive tab (11157) and the negative tab (11158).
  12. 12. The battery cell (1110) of claim 11 wherein the boss (11142) is disposed flush with the partition member (1116) at the protruding end of the boss (11142).
  13. 13. The battery cell (1110) of claim 1 or 2, wherein the flow guide channel (11143) includes a flow guide groove (11144) and a plurality of flow guide holes (11145) in communication with the flow guide groove (11144), the insulating pad (11141) has a second surface (111412) opposite to the first surface (111411), corresponding to the boss (11142), the flow guide groove (11144) is opened on the second surface (111412) and extends into the boss (11142) so that the boss (11142) forms a flow guide wall (11146) at a bottom of the flow guide groove (11144), and a plurality of the flow guide holes (11145) are arranged on the flow guide wall (11146) at intervals.
  14. 14. The battery cell (1110) of claim 13 wherein the insulating pad (11141) further has a second surface (111412) opposite the first surface (111411), and wherein the insulating member (1114) further defines a drainage channel (11147) extending through the first surface (111411) and the second surface (111412) such that the drainage channel (11147) communicates with the cavity (11111) and the explosion-proof valve (1113), and wherein the drainage channel (11147) is disposed opposite the explosion-proof valve (1113) and is configured to clear the boss (11142).
  15. 15. The battery cell (1110) of claim 14, wherein the second surface (111412) is further provided with a containing groove (11148), the explosion-proof valve (1113) is contained in the containing groove (11148), the diversion groove (11144) is formed in a groove bottom of the containing groove (11148), a region, which is away from the diversion groove (11144), on a groove bottom wall of the containing groove (11148) is provided with the diversion channel (11147), and the diversion channel (11147) penetrates through a groove bottom wall of the containing groove (11148) and the first surface (111411).
  16. 16. The battery cell (1110) of claim 1, wherein the battery cell (1110) further comprises an electrode terminal (1112) connected to the housing (1111), and the insulator (1114) further comprises a terminal insulator (11149) connected to the insulator pad (11141), the terminal insulator (11149) being opposite to and connected to the electrode terminal (1112).
  17. 17. A battery device (1100), characterized in that the battery device (1100) comprises a battery cell (1110) according to any one of claims 1-16.
  18. 18. An electrical device comprising a battery cell (1110) according to any one of claims 1-16 or a battery device (1100) according to claim 17, said battery device (1100) being adapted to store or provide electrical energy.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of battery production, in particular to a battery cell, a battery device and an electric device. Background In the technical field of batteries, the design and optimization of the internal structure of a battery cell are always one of the key directions of research. Inside the battery cell, an insulator, referred to in the industry as lower plastic, is typically disposed between the electrode assembly and the top cover of the housing. The insulating member is generally formed with a flow guiding structure opposite to and communicating with the explosion-proof valve, and the flow guiding structure is generally protruded toward the electrode assembly to form a boss in order to save space inside the battery cell. In the wound electrode assembly or the bare cell, tabs are generally arranged at both ends in the longitudinal direction of the electrode assembly in the winding process. However, due to various complex factors such as equipment precision and production process, the dislocation phenomenon of the tab is very easy to occur in the actual production process, and the dislocation problem becomes more remarkable as the number of layers of the tab is increased. In the related art, the layout form between the lug boss and the lug is extremely easy to cause interference between the misplaced lug and the lug boss, so that the problems of limited assembly of an insulating part, extruded and damaged lug and the like are caused, the assembly of the battery cell is influenced, and the reliability of the battery cell in the use process is influenced. Disclosure of utility model The application aims to provide a battery monomer, a battery device and an electricity utilization device, and aims to solve the technical problem that when a tab is misplaced, interference is easy to occur with a boss. In a first aspect, the present application provides a battery cell comprising: A housing having a receiving cavity; the explosion-proof valve is arranged on the shell; The electrode assembly is accommodated in the accommodating cavity and provided with a first end face and a tab protruding on the first end face, the first end face is provided with a first side, the tab is arranged on the first side and provided with a tab edge far away from the first side along a first direction; The insulation piece is accommodated in the accommodating cavity and is configured between the first end face and the shell, the insulation piece comprises an insulation pad and a boss, the insulation pad is provided with a first surface opposite to the first end face, the boss is convexly arranged on the first surface towards the first end face, a flow guide channel is formed in the boss and is communicated with the accommodating cavity and the explosion-proof valve, and the boss is configured to have a first interval distance with the edge of the tab along the first direction so that the tab and the boss are configured in an avoidance mode. In this embodiment, through making the first interval distance of formation between boss and the tab limit, then at electrode assembly coiling shaping's in-process, even the tab has taken place dislocation or aversion in perpendicular to stacking direction, the tab also is difficult for taking place to contact between the boss, produces the interference to be convenient for assemble between insulating pad and the electrode assembly, make the tab be difficult for taking place to extrude with the boss between, thereby make the tab be difficult for damaging, be favorable to promoting the reliability of battery monomer in the use. In one embodiment, the boss is configured to have a second separation distance from the first side in the first direction, the second separation distance being greater than a width of the tab in the first direction. In this embodiment, the distance between the boss and the first side of the electrode assembly is controlled to form an interval between the boss and the edge of the tab in the first direction, so that the tab is not easy to contact with the boss and interfere with the boss, thereby facilitating assembly and improving reliability of the battery cell. In one embodiment, along the first direction, the first end face further has a second side opposite to the first side, the tab includes a first ear and a second ear, the first ear is configured at the first side and has a first tab edge away from the first side, the second ear is configured at the second side and has a second tab edge away from the second side, and the boss is configured to have a first separation distance from both the first tab edge and the second tab edge. In this embodiment, the first tab portion and the second tab portion are displaced or displaced in the direction perpendicular to the stacking direction, and the first tab portion and the second tab portion are not easily contacted with