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BR-112022014375-B1 - Battery cell, battery, electrical device, battery cell manufacturing method, and battery cell manufacturing system.

BR112022014375B1BR 112022014375 B1BR112022014375 B1BR 112022014375B1BR-112022014375-B1

Abstract

BATTERY CELL, BATTERY, ELECTRICAL APPARATUS, BATTERY CELL MANUFACTURING METHOD AND BATTERY CELL MANUFACTURING SYSTEM. The embodiments of this application provide a battery cell, a battery, an electrical apparatus, and a battery cell manufacturing method and system. The battery cell includes a casing, an electrode assembly, and an end cover assembly. The casing provides an opening. The electrode assembly is arranged in the casing. The electrode assembly includes a body portion, a tab, and an insulation portion. The tab extends from one end of the body portion to the opening. The insulation portion is arranged on a periphery of the tab. The end cover assembly is configured to close the opening. The end cover assembly includes an end cover and a first insulator. The end cover is configured to cover the opening and is connected to the casing. The first insulator is located on one side of the end cover closest to the inside of the enclosure. The first insulator has a concave portion. At least part of the flap is accommodated in the concave portion. The first insulator (...).

Inventors

  • Yuqun Zeng
  • Wenlong KANG
  • Chengyou Xing
  • Peng Wang
  • Quankun Li
  • Huasheng Su
  • Wenzhong Liu

Assignees

  • CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

Dates

Publication Date
20260310
Application Date
20200930

Claims (16)

  1. 1. BATTERY CELL (40), comprising: a casing (41), providing an opening (411); an electrode assembly (42), disposed in the casing (41), wherein the electrode assembly (42) comprises a body portion (421), a tab (422) and an insulating portion (423), the tab (422) extending from one end (421a) of the body portion (421) to the opening (411) and the insulating portion (423) being disposed on a periphery of the tab (422); an end cover assembly (43), configured to close the opening (411), wherein the end cover assembly (43) comprises an end cover (431) and a first insulator (432), the end cover (431) is configured to cover the opening (411) and is connected to the enclosure (41), the first insulator (432) is disposed on one side of the end cover (43) nearest to the interior of the enclosure (41), the first insulator (432) has a concave portion (432a), at least part of the tab (422) is accommodated in the concave portion (432a) and the first insulator (432) is configured to abut the insulator portion (423) to insulate the tab (422) from the enclosure (41); wherein the first insulator (432) comprises a body (4321) and an extension portion. (4322) which are interconnected, the body (4321) is configured to be connected to the end cover (431), the extension portion (4322) extends and projects from the body (4321) to the electrode assembly (42) to form the concave portion (432a), the extension portion (4322) is disposed on the periphery of the tab (422) and the extension portion (4322) abuts against the insulation portion (423); wherein the battery cell (40) is characterized by the electrode assembly (42) further comprising a second insulator (424) and the second insulator (424) encircling a contact area between the first insulator (432) and the insulation portion (423) to insulate the contact area from the casing (41), wherein the second insulator (424) abuts against an outer surface of the first insulator (432) facing towards the enclosure (41) and is in contact with the insulation portion (423).
  2. 2. BATTERY CELL (40), according to claim 1, characterized in that the extension portion (4322) is located on one side of the insulation portion (423) closest to the end cover (431) and the extension portion (4322) rests against the insulation portion (423) in a direction that comes out of the end cover (431).
  3. 3. BATTERY CELL (40), according to any one of claims 1 to 2, characterized in that the extension portion (4322) is of a continuously extending closed-circuit structure or an annular structure with a notch.
  4. 4. BATTERY CELL (40), according to any one of claims 1 to 3, characterized in that the insulation portion (423) is annular.
  5. 5. BATTERY CELL (40), according to any one of claims 1 to 3, characterized in that the battery cell (40) comprises a cylindrical structure and the flange (422) comprises a step portion (422a), the step portion (422a) comprising a first lateral surface (4221), a transition surface (4222) and a second lateral surface (4223), the first lateral surface (4221) is adjacent to the body portion (421), the transition surface (4222) connects the first lateral surface (4221) and the second lateral surface (4223), the transition surface (4222) faces the end cover (431), a minimum radial dimension of the first lateral surface (4221) is greater than a maximum radial dimension of the second lateral surface (4223) and at least part of an inner wall of the concave portion (432a) surrounds the second lateral surface. (4223).
  6. 6. BATTERY CELL (40), according to claim 5, characterized in that the extension portion (4322) surrounds the second lateral surface (4223) and the insulation portion (423) is disposed on the transition surface (4222).
  7. 7. BATTERY CELL (40), according to any one of claims 5 to 6, characterized in that the electrode assembly (42) comprises a first electrode plate (42a), a second electrode plate (42b) and a separator (42c), the first electrode plate (42a) and the second electrode plate (42b) each having a coated area and an uncoated area, a portion of the electrode assembly (42) corresponding to the coated areas of the first electrode plate (42a) and the second electrode plate (42b) is the body portion (421), the uncoated area of the first electrode plate (42a) or the second electrode plate (42b) forms the tab (422), the separator (42c) is configured to isolate the first electrode plate (42a) from the second electrode plate (42b) and the insulating portion (423) is a portion of the separator (42c) that extends beyond the portion of body (421) and located on the periphery of the flap (422).
  8. 8. BATTERY CELL (40), according to claim 7, characterized in that the insulating portion (423) is a part of the separator (42c) that extends beyond the first lateral surface (4221) and is located on a periphery of the second lateral surface (4223).
  9. 9. BATTERY CELL (40), according to claim 1, characterized in that the outer surface has a guide inclination and the guide inclination is inclined relative to the concave portion (432a) in a direction that comes out of the end cover (431).
  10. 10. BATTERY CELL (40), according to any one of claims 1 to 9, characterized in that the second insulator (424) is adhered to the outer surface.
  11. 11. BATTERY CELL (40), according to any one of claims 1 to 10, characterized in that an area of the second insulator (424) abutting the outer surface is closer to the end cover (431) than to the tab (422).
  12. 12. BATTERY CELL (40), according to any one of claims 1 to 11, characterized in that the end cover assembly (43) further comprises a connecting piece, the connecting piece being accommodated in the concave portion (432a), the connecting piece comprising a first connecting portion (441), the first connecting portion (441) being configured to be connected to the tab (422), and the first insulator (432) and the electrode assembly (42) pressing against the first connecting portion (441).
  13. 13. BATTERY, characterized by comprising the battery cell (40), as defined in any of claims 1 to 12.
  14. 14. ELECTRICAL APPARATUS, characterized by comprising the battery cell (40), as defined in any one of claims 1 to 12, wherein the battery cell (40) is configured to supply electrical energy.
  15. 15. METHOD OF MANUFACTURING A BATTERY CELL (40), comprising: placing an electrode assembly (42) having a body portion (421), a tab (422) and an insulation portion (423) in a housing (41) having an opening (411), wherein the tab (422) extends from one end of the body portion (421) to the opening (411) and the insulation portion (423) is disposed on a periphery of the tab (422); Assembling an end cover assembly (43) having an end cover (431) and a first insulator (432) with the enclosure (41), wherein the end cover (431) covers the opening (411) and is connected to the enclosure (41), the first insulator (432) is located on one side of the end cover (431) closer to the interior of the enclosure (41), the first insulator (432) has a concave portion (432a), at least part of the tab (422) is accommodated in the concave portion (432a) and the first insulator (432) rests against the insulating portion (423) to insulate the tab (422) from the enclosure (41), wherein the method is characterized by the electrode assembly (42) further comprising a second insulator (424) and the second insulator (424) encircling a contact area between the first insulator (432) and the insulation portion (423) to insulate the backing area of the enclosure (41), wherein the second insulator (424) rests against an external surface of the first insulator (432) facing the enclosure (41) and is in contact with the insulation portion (423).
  16. 16. BATTERY CELL MANUFACTURING SYSTEM (40), comprising: a first assembly apparatus, configured to place an electrode assembly (42) having a body portion (421), a tab (422) and an insulation portion (423) in a housing (41) having an opening (411), wherein the tab (422) extends from one end of the body portion (421) to the opening (411) and the insulation portion (423) is disposed on a periphery of the tab (422); a second mounting apparatus, configured for mounting an end cover assembly (43) having an end cover (431) and a first insulator (432) with the housing (41), wherein the end cover (431) covers the opening (411) and is connected to the housing (41), the first insulator (432) is located on one side of the end cover (431) closer to the inside of the housing (41), the first insulator (432) has a concave portion (432a), at least part of the tab (422) is accommodated in the concave portion (432a) and the first insulator (432) rests against the insulating portion (423) to insulate the tab (422) from the housing (41), wherein the system is characterized by the electrode assembly (42) further comprising a second insulator (424) and the second insulator (424) surrounds a backing area between the first insulator (432) and the insulation portion (423) to isolate the backing area from the enclosure (41), wherein the second insulator (424) rests against an external surface of the first insulator (432) facing the enclosure (41) and is in contact with the insulation portion (423).

Description

FIELD OF THE INVENTION [001] This application relates to the field of battery technologies and, in particular, to a battery cell, a battery, an electrical apparatus and a method of manufacturing and a battery cell system. BACKGROUND OF THE INVENTION [002] Rechargeable batteries have been widely used in electric vehicles, mobile devices, or power tools due to advantages such as high energy density, high power density, large cycle count, long storage time, and the like. A battery includes a battery cell. However, during the use of the battery cell, there is a problem of short-circuiting, which affects the safety of using the battery cell. BRIEF DESCRIPTION OF THE INVENTION [003] The embodiments of this application provide a battery cell, a battery, an electrical apparatus and a method of manufacturing and battery cell system, to deal with battery cell short circuits that affect safety in use. [004] One embodiment of this application provides a battery cell, including a casing, an electrode assembly, and an end cover assembly. The casing provides an opening. The electrode assembly is disposed within the casing. The electrode assembly includes a body portion, a tab, and an insulation portion. The tab extends from one end of the body portion to the opening. The insulation portion is disposed on a periphery of the tab. The end cover assembly is configured to close the opening. The end cover assembly includes an end cover and a first insulator. The end cover is configured to cover the opening and is connected to the casing. The first insulator is disposed on one side of the end cover closest to the inside of the casing. The first insulator has a concave portion. At least part of the tab is accommodated within the concave portion. The first insulator is configured to abut the insulation portion to insulate the tab from the casing. [005] In one embodiment of this application, the first insulator includes a body and an extension portion that are interconnected, the body is configured to be connected to the end cover, the extension portion extends and projects from the body to the electrode assembly to form the concave portion, the extension portion is disposed on the periphery of the tab and the extension portion rests against the insulator portion. Because the first insulator has the extension portion, during assembly, the extension portion of the first insulator can be inserted into a gap between the tab and the housing, so that the extension portion can guide the tab into the concave portion of the first insulator accurately. This reduces the possibility of the tab being deformed by the first insulator applying a pressure force to the tab during assembly and allows the extension portion to protect and limit the tab earlier during assembly. [006] In one embodiment of this application, the extension portion is located on one side of the insulation portion closest to the end cover, and the extension portion abuts the insulation portion in a direction that moves away from the end cover. The extension portion can limit and restrict the insulation portion, reducing the possibility of the insulation portion moving in a direction that approaches or moves away from the end cover, thus reducing the possibility of the extension portion and the insulation portion being out of contact due to the insulation portion moving in the direction of approach or leaving the end cover. Furthermore, the extension portion can also limit and restrict the electrode assembly, reducing the possibility of the electrode assembly moving in a direction that approaches or moves away from the end cover. [007] In one embodiment of this application, the extension portion is of a closed-loop structure that extends continuously. As an end surface of the extension portion furthest from the end cover is of a closed-loop structure, the extension portion can provide protective insulation for the flap around the entire periphery of the flap, further improving the insulation effect. Alternatively, the extension portion is of an annular structure with a notch. The notch in the extension can provide a prevention gap. [008] In one embodiment of this request, the insulating portion is annular. The insulating portion completely encloses the periphery of the flap, so that the insulating portion can form protection for the flap in an entire circumferential direction of the flap. [009] In one embodiment of this application, the tab includes a step portion, wherein the step portion includes a first side surface, a transition surface, and a second side surface; the first side surface is adjacent to the body portion; the transition surface connects the first side surface and the second side surface; the transition surface faces the end cover; a minimum radial dimension of the first side surface is greater than a maximum radial dimension of the second side surface; and at least part of an inner wall of the concave portion surrounds the second side surface. A portion of t