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WO-2026092101-A1 - COVER PLATE STRUCTURE, BATTERY CELL, BATTERY AND ELECTRICAL DEVICE

WO2026092101A1WO 2026092101 A1WO2026092101 A1WO 2026092101A1WO-2026092101-A1

Abstract

The present application relates to the technical field of batteries. Provided in the embodiments of the present application are a cover plate structure, a battery cell, a battery and an electrical device. The cover plate structure comprises a cover plate, a connecting member and a measurement member; the cover plate is used for covering a housing of a battery cell, and the cover plate is provided with a communication hole, the communication hole being in communication with an inner cavity of the housing; the connecting member is connected to the cover plate and is suitable for forming a chamber, the chamber being in communication with the communication hole; and the measurement member is used for measuring gas parameters in the chamber. The cover plate structure, the battery cell, the battery and the electrical device provided in the embodiments of the present application can reduce damage to the cover plate structure, and prolong the service life of the cover plate structure.

Inventors

  • ZHAN, Yingxin
  • WAN, Liyang
  • WANG, PENG
  • RONG, LIANGBIN
  • YUAN, Wansong
  • KANG, Junhui
  • TAN, Weilin

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260507
Application Date
20251011
Priority Date
20241031

Claims (20)

  1. A cover plate structure (100), comprising: A cover plate (110) is used to cover the housing (200) of a battery cell; the cover plate (110) has a connecting hole (111) that communicates with the inner cavity of the housing (200); A connector (120) is connected to the cover plate (110) and adapted to form a chamber (130); the chamber (130) communicates with the connecting hole (111); The detection element (140) is used to detect gas parameters in the chamber (130).
  2. According to claim 1, the cover plate structure (100) wherein the connector (120) and the cover plate (110) enclose the chamber (130).
  3. According to claim 1 or 2, the cover plate structure (100) wherein the connector (120) has a through cavity that extends through the connector (120) along the thickness direction of the cover plate (110) and is adapted to form the chamber (130).
  4. According to any one of claims 1-3, the cover structure (100) is provided on the connector (120) and covers the chamber (130).
  5. According to any one of claims 1-4, the cover structure (100) wherein the connector (120) includes a recessed area (121) recessed toward the cover (110), the recessed area (121) exposing at least a portion of the chamber (130); The detection element (140) is disposed within the recessed area (121).
  6. The cover plate structure (100) according to any one of claims 1-5, wherein the cover plate structure (100) further includes a barrier (150), the barrier (150) being disposed on the connector (120) and sealing the chamber (130); The detection element (140) is disposed on the barrier element (150) and located on the side of the barrier element (150) opposite to the connector (120).
  7. According to claim 6, the cover structure (100) wherein the barrier (150) covers the top surface of the connector (120) and seals the chamber (130); Alternatively, the side surface and at least part of the top surface of the barrier (150).
  8. According to the cover plate structure (100) of claim 6, the barrier (150) includes a first barrier (151) and a second barrier (152), wherein the materials of the first barrier (151) and the second barrier (152) are different. The first barrier (151) is connected to the end of the connector (120) away from the cover plate (110); the second barrier (152) is disposed on the first barrier (151); The detection element (140) is disposed on the second barrier element (152).
  9. According to claim 8, the cover plate structure (100) is wherein the first barrier (151) is a polyimide film and the second barrier (152) is an aluminum-plastic film.
  10. The cover plate structure (100) according to any one of claims 1-9, wherein the cover plate structure (100) further includes a circuit board (170) disposed on the cover plate (110); The circuit board (170) is connected to the detection element (140) and is used to process the detection signal of the detection element (140).
  11. According to the cover structure (100) of claim 10, the circuit board (170) is further covered over the detection element (140).
  12. According to claim 10 or 11, the cover plate structure (100) is wherein the circuit board (170) is connected to the cover plate (110) by fasteners (180).
  13. According to the cover plate structure (100) of claim 12, the fastener (180) includes a first fastener (181) and/or a second fastener (182). The first fastener (181) includes a connecting post and a screw. The connecting post is disposed on the cover plate (110) and has a threaded hole. One end of the screw passes through the circuit board (170) and is screwed into the threaded hole. One end of the second fastener (182) is connected to the cover plate (110) and the other end is engaged with the circuit board (170).
  14. According to claim 10 or 11, the cover plate structure (100) wherein the circuit board (170) is further sealed to the connector (120) by a seal (190).
  15. According to claim 14, the cover plate structure (100) wherein the sealing element (190) includes a sealing frame (191) and a sealing ring (192), the sealing ring (192) is disposed on the barrier element (150), and the sealing frame (191) is disposed on the sealing ring (192); The sealing frame (191), the sealing ring (192), the connector (120), and the circuit board (170) form a mounting cavity for accommodating the detection component (140).
  16. According to claim 14, the cover structure (100) wherein the seal (190) includes a sealing ring.
  17. The cover structure (100) according to any one of claims 1-16, wherein the detection element (140) includes a pressure sensor or a gas sensor.
  18. A battery cell (1000) includes a housing (200) and a cover structure (100) as described in any one of claims 1-17; The cover structure (100) is disposed at the opening of the housing (200) and covers the opening.
  19. According to claim 18, the battery cell (1000) further includes a hollow flange (210) disposed on the housing (200) and surrounding the opening; The cover plate structure (100) is located within the area enclosed by the flange (210).
  20. A battery comprising a housing and a plurality of battery cells (1000) as described in claim 18 or 19, wherein the plurality of battery cells (1000) are disposed within the housing.

Description

Cover structure, battery cells, batteries and electrical equipment [Priority Information and Cross-Referencing] This application claims priority to Chinese Patent Application No. 202411554335.8, filed on October 31, 2024, entitled “Cover Structure, Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field This application relates to the field of battery technology, and in particular to a cover plate structure, a battery cell, a battery, and an electrical device. Background Technology A battery is a device that converts chemical energy into electrical energy and is widely used in new energy vehicles, energy storage power stations, and other fields. A battery typically consists of multiple battery cells, each of which includes a casing, electrode components, and a cover. The electrode components are housed inside the casing, and the cover is connected to the casing and seals the outside. When a battery cell is in operation, it generates a large amount of gas, and the accumulation of this gas inside the casing causes changes in gas pressure. In related technologies, a detection element is typically installed on the cover plate to detect pressure changes inside the housing. However, the detection element can easily damage the cover plate, reducing its service life. Summary of the Invention In view of the above problems, embodiments of this application provide a cover plate structure, a battery cell, a battery, and an electrical device, which can reduce damage to the cover plate structure and improve the service life of the cover plate structure. To achieve the above objectives, the embodiments of this application provide the following technical solutions: A first aspect of this application provides a cover plate structure, which includes: A cover plate for sealing the housing of a battery cell; the cover plate has a connecting hole that communicates with the inner cavity of the housing; A connector, which is attached to the cover plate and adapted to form a chamber; the chamber communicates with the communicating hole; A detection element, used to detect gas parameters within the chamber. In one possible implementation, the connector and the cover plate enclose the cavity. In one possible implementation, the connector has a through cavity that extends through the connector along the thickness direction of the cover plate and is adapted to form the chamber. In one possible implementation, the detection element is disposed on the connector and covers the chamber. In one possible implementation, the connector includes a recessed area recessed toward the cover plate, the recessed area exposing at least a portion of the chamber; The detection element is disposed within the recessed area. In one possible implementation, the cover structure further includes a barrier element disposed on the connector and sealing the chamber; The detection element is disposed on the barrier element and located on the side of the barrier element opposite to the connector. In one possible implementation, the barrier covers the top surface of the connector and seals the chamber; Alternatively, the barrier may cover the sides and part of the top surface. In one possible implementation, the barrier includes a first barrier and a second barrier, wherein the materials of the first barrier and the second barrier are different. The first barrier is connected to the end of the connector that faces away from the cover plate; the second barrier is disposed on the first barrier; The detection element is disposed on the second barrier element. In one possible implementation, the first barrier is a polyimide film and the second barrier is an aluminum-plastic film. In one possible implementation, the cover structure further includes a circuit board disposed on the cover. The circuit board is connected to the detection device and is used to process the detection signal of the detection device. In one possible implementation, the circuit board is also covered over the detection element. In one possible implementation, the circuit board is connected to the cover plate via a connector. In one possible implementation, the connector includes a first fastener and a second fastener. The first fastener includes a connecting post and a screw. The connecting post is disposed on the cover plate and has a threaded hole. One end of the screw passes through the circuit board and is screwed into the threaded hole. One end of the second fastener is connected to the cover plate, and the other end is engaged with the circuit board. In one possible implementation, the circuit board is also sealed to the connector via a seal. In one possible implementation, the seal includes a sealing frame and a sealing ring, the sealing ring being disposed on the barrier and the sealing frame being disposed on the sealing ring; The sealing frame, the sealing ring, the connector, and the circuit board form a mounting