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EP-4742433-A1 - BATTERY CELL, BATTERY, AND ELECTRIC DEVICE

EP4742433A1EP 4742433 A1EP4742433 A1EP 4742433A1EP-4742433-A1

Abstract

A battery cell, a battery, and an electric device are provided. The battery cell includes a main body portion, a first tab, a first insulating adhesive, and a second insulating adhesive. The first tab is formed at an axial end of the main body portion. The first insulating adhesive is adhered to an outer periphery of the main body portion. The second insulating adhesive is adhered to the first tab. In an axial direction of the main body portion, a gap is provided between the first insulating adhesive and the second insulating adhesive. The battery includes the battery cell. The electric device includes the battery cell or the battery.

Inventors

  • WU, KAI
  • YANG, Zhenfei
  • ZHU, LINLIN
  • YU, QI

Assignees

  • Contemporary Amperex Technology Co., Limited

Dates

Publication Date
20260513
Application Date
20230906

Claims (20)

  1. A battery cell (20), comprising: a main body portion (1); a first tab (2), formed at an axial end of the main body portion (1); a first insulating adhesive (3), adhered to an outer periphery of the main body portion (1); and a second insulating adhesive (4), adhered to the first tab (2); wherein, in an axial direction of the main body portion (1), a gap (5) is provided between the first insulating adhesive (3) and the second insulating adhesive (4).
  2. The battery cell (20) according to claim 1, wherein the gap (5) extends in a circumferential direction of the main body portion (1).
  3. The battery cell (20) according to claim 1 or 2, wherein, in the axial direction of the main body portion (1), a width of the gap (5) is 1 mm to 2 mm.
  4. The battery cell (20) according to any one of claims 1 to 3, wherein, in the axial direction of the main body portion (1), the width of the gap (5) is fixed or variable along the circumferential direction.
  5. The battery cell (20) according to any one of claims 1 to 4, wherein a puncture resistance of the second insulating adhesive (4) is greater than a puncture resistance of the first insulating adhesive (3).
  6. The battery cell (20) according to any one of claims 1 to 5, wherein, in a circumferential direction of the first tab (2), a head portion and a tail portion of the second insulating adhesive (4) have an overlapping portion (43).
  7. The battery cell (20) according to claim 6, wherein, in the circumferential direction of the first tab (2), a length of the overlapping portion (43) is 5 mm to 10 mm.
  8. The battery cell (20) according to claim 6 or 7, wherein an upper layer of the overlapping portion (43) is misaligned relative to a lower layer.
  9. The battery cell (20) according to any one of claims 1 to 8, wherein, in the circumferential direction of the first tab (2), a head edge line and a tail edge line of the second insulating adhesive (4) are parallel.
  10. The battery cell (20) according to any one of claims 1 to 9, wherein, in the circumferential direction of the first tab (2), the head edge line and/or the tail edge line of the second insulating adhesive (4) is inclined relative to an axis of the main body portion (1).
  11. The battery cell (20) according to any one of claims 1 to 10, wherein the second insulating adhesive (4) comprises a first adhesive portion (41) and a second adhesive portion (42), the first adhesive portion (41) being circumferentially adhered to an outer periphery of the first tab (2), and the second adhesive portion (42) being adhered to an end face of the first tab (2) away from the main body portion (1).
  12. The battery cell (20) according to claim 11, further comprising a first current collector disc (6) disposed on the end face of the first tab (2) away from the main body portion (1), wherein the second adhesive portion (42) is adhered to the first current collector disc (6).
  13. The battery cell (20) according to claim 11 or 12, wherein the first adhesive portion (41) and the second adhesive portion (42) are connected or integrally formed.
  14. The battery cell (20) according to any one of claims 11 to 13, wherein a viscosity of the second adhesive portion (42) is greater than a viscosity of the first adhesive portion (41).
  15. The battery cell (20) according to any one of claims 11 to 14, wherein a ratio of a width of the first adhesive portion (41) in the axial direction of the main body portion (1) to a width of the second adhesive portion (42) in a direction perpendicular to the axis of the main body portion (1) is from 1:1 to 2:1.
  16. The battery cell (20) according to any one of claims 11 to 15, wherein the second insulating adhesive (4) is provided with an indication line (44), and the indication line (44) divides the second insulating adhesive (4) into the first adhesive portion (41) and the second adhesive portion (42).
  17. The battery cell (20) according to claim 16, wherein a color of the indication line (44) is different from a color of the second insulating adhesive (4).
  18. The battery cell (20) according to any one of claims 11 to 17, wherein the second adhesive portion (42) comprises a substrate and adhesive backing disposed on the substrate, and a color of at least one of the substrate and the adhesive backing is set to prevent reflection from occurring when detecting the width of the second adhesive portion (42).
  19. The battery cell (20) according to any one of claims 11 to 18, further comprising a housing (9), wherein the housing (9) has an accommodating cavity, the main body portion (1) and the first tab (2) are disposed in the accommodating cavity, and a material of the housing (9) is configured to prevent corrosion from occurring due to contact between the housing (9) and a negative electrode of the battery cell (20).
  20. A battery (100), comprising a box and the battery cell (20) according to any one of claims 1 to 19, wherein the battery cell (20) is disposed within the box, and the battery cell (20) is configured to provide electrical energy.

Description

The present application is based on and claims priority to Chinese Patent Application No. 202310970192.8, filed on August 3, 2023, and the content disclosed in this Chinese application is incorporated herein by reference in its entirety. TECHNICAL FIELD The present invention relates to the field of battery technologies, and in particular, to a battery cell, a battery, and an electric device. BACKGROUND Energy conservation and emission reduction are crucial to the sustainable development of the automobile industry. Electric vehicles, with their advantages in energy conservation and emission reduction, have become an important part of the sustainable development of the automobile industry. For electric vehicles, battery technologies are an important factor in connection with their development. During use, batteries undergo continuous charging or discharging, making insulation an important aspect for batteries. Generally, an insulating adhesive is applied to the exterior of a cell, and the method of applying the insulating adhesive affects the overall performance of the battery. The description above merely provides background information related to the present application and does not necessarily constitute the prior art. SUMMARY The present application provides a battery cell, a battery, and an electric device. According to a first aspect, the present application provides a battery cell including a main body portion, a first tab, a first insulating adhesive, and a second insulating adhesive. The first tab is formed at an axial end of the main body portion, the first insulating adhesive is adhered to an outer periphery of the main body portion, and the second insulating adhesive is adhered to the first tab, where, in an axial direction of the main body portion, a gap is provided between the first insulating adhesive and the second insulating adhesive. In the embodiments provided by the present application, by providing a gap between the first insulating adhesive and the second insulating adhesive in the axial direction of the main body portion, the formation of a step between the first insulating adhesive and the second insulating adhesive can be reduced, thereby reducing stress concentration points when the battery cell swells, mitigating issues such as electrode plate breakage, which is conducive to improving the safety of the battery. In some embodiments, the gap extends in a circumferential direction of the main body portion. This arrangement ensures that, in the circumferential direction of the main body portion, there is no overlap between the first insulating adhesive and the second insulating adhesive, and therefore, there are no lap portions between the first insulating adhesive and the second insulating adhesive, preventing the formation of any step, and significantly reducing stress concentration points during the swelling of the battery cell, preventing issues such as electrode plate breakage in the battery cell from occurring. In some embodiments, in the axial direction of the main body portion, a width of the gap is 1 mm to 2 mm. Setting the width of the gap to be from 1 mm to 2 mm can both reduce stress concentration points during the swelling of the battery cell, preventing issues such as electrode plate breakage in the battery cell from occurring, and allow the electrode assembly to have as large an insulation coverage range as possible, improving insulation performance. In some embodiments, in the axial direction of the main body portion, the width of the gap is fixed or variable along the circumferential direction. Setting the width of the gap to be fixed along the circumferential direction can ensure uniformity in the width of gap, enhancing the aesthetic appearance and overall integrity of the product. Alternatively, setting the width of gap to vary along the circumferential direction can reduce the difficulty of adhering the first insulating adhesive and the second insulating adhesive, improving adhesion efficiency. In some embodiments, a puncture resistance of the second insulating adhesive is greater than a puncture resistance of the first insulating adhesive. The first tab is generally made of aluminum foil, which is more fragile compared to the main body portion. Therefore, setting the puncture resistance of the second insulating adhesive to be greater than the puncture resistance of the first insulating adhesive can more effectively protect the first tab, and the first tab is prevented from being damaged. In some embodiments, in a circumferential direction of the first tab, a head portion and a tail portion of the second insulating adhesive have an overlapping portion. By providing an overlapping portion, the head portion and tail portion of the second insulating adhesive can be bonded together, such that the second insulating adhesive forms a closed loop in the circumferential direction, providing ° comprehensive insulation protection for the first tab. This also effectively improv