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EP-4583296-B1 - CELLS CONTACT SHEETS, CELLS CONTACT SYSTEMS, AND BATTERY PACKS

EP4583296B1EP 4583296 B1EP4583296 B1EP 4583296B1EP-4583296-B1

Inventors

  • LIAO, Hulong

Dates

Publication Date
20260513
Application Date
20241216

Claims (14)

  1. A cells contact sheet (011) being integrally-formed and applicable to a battery module comprising a plurality of cell groups, wherein the cells contact sheet (011) comprises: a plurality of cells contact sub-sheets (111) configured to acquire work signals of the plurality of cell groups, respectively; and at least one connecting sheet (112) being flexible and electrically conductive, wherein each of the at least one connecting sheet (112) is arranged between every two adjacent ones of the cells contact sub-sheets (111) to connect the every two adjacent ones of the cells contact sub-sheets (111) to each other; the each of the at least one connecting sheet (112) is provided with a first bending structure (1121) configured to deform when two of the cell groups respectively corresponding to the every two adjacent ones of the cells contact sub-sheets (111) move away from each other or close to each other, characterised by the fact that each of the cells contact sub-sheets has a voltage acquisition area (1113) comprising an acquisition notch (1114); an acquisition terminal sheet (1115) is arranged in the acquisition notch (1114) to acquire a voltage signal of one of the cell groups corresponding to the each of the cells contact sub-sheets; the acquisition terminal sheet (1115) has a first end connected with a first side surface of the acquisition notch (1114), and a second end being opposite to the first end and connected with a second side surface of the acquisition notch (1114); and a gap (1116) extending in a direction from the first end to the second end is formed between the acquisition terminal sheet (1115) and the acquisition notch (1114).
  2. The cells contact sheet of claim 1, characterized in that the each of the at least one connecting sheet further comprises a sheet body, and the first bending structure protrudes, relatively to the sheet body, toward the two of the cell groups.
  3. The cells contact sheet of claim 2, characterized in that the first bending structure has a first surface (11211), and the first surface (11211) is in a middle of the first bending structure and faces the two of the cell groups; and the first surface (11211) is parallel to each of the cells contact sub-sheets.
  4. The cells contact sheet of claim 3, characterized in that each corner of the first bending structure is rounded.
  5. The cells contact sheet of any one of claims 1-4, characterized in that one of the cells contact sub-sheets is provided with a first signal output terminal (1111) and a second bending structure (1112) close to the first signal output terminal (1111); and the second bending structure (1112) is configured to deform when the first signal output terminal (1111) and two of the cell groups corresponding to the one of the cells contact sub-sheets move away from each other or close to each other.
  6. The cells contact sheet of claim 5, characterized in that the second bending structure comprises an arc-shaped structure having a concave side away from the first signal output terminal.
  7. The cells contact sheet of claim 1, characterized in that the second end of the acquisition terminal sheet is connected with the second side surface of the acquisition notch through a connection structure, and the connection structure is configured to break when the each of the cells contact sub-sheets is pulled.
  8. The cells contact sheet of claim 7, characterized in that the connection structure comprise a connection strip (1117) having two ends respectively connected with the second end of the acquisition terminal sheet and the second side surface of the acquisition notch; and a cutting notch (11171) is provided in a middle of the connection strip (1117) and configured to cause the connection strip (1117) to break when the each of the cells contact sub-sheets is pulled.
  9. The cells contact sheet of claim 1, characterized in that the acquisition terminal sheet is provided with a buffer notch (11151) between the first end and the second end.
  10. The cells contact sheet of any one of claims 1-4, characterized in that each of the cells contact sub-sheets has an edge connected with a bent terminal sheet (113) configured to acquire a temperature signal of one of the cell groups corresponding to the each of the cells contact sub-sheets.
  11. A cells contact system (001), characterized by comprising: a holder (012); a plurality of busbars (013) arranged in parallel on the holder (012) and configured to be respectively connected with a plurality of cell groups of a battery module; and a cells contact sheet of any one of claims 1-10, wherein the plurality of cells contact sub-sheets are opposite to and connected with the plurality of busbars (013), respectively.
  12. A battery pack, characterized by comprising: a housing (002) having a first accommodating cavity (021) and a second accommodating cavity (022) arranged in a longitudinal direction; at least one battery module (008) arranged in the first accommodating cavity (021), the battery module (008) comprising a plurality of cell groups (081) arranged in the longitudinal direction; a battery management system board arranged in the second accommodating cavity (022); and at least one cells contact system of claim 11 arranged in the first accommodating cavity (021), wherein one of the cells contact sub-sheets is provided with a first signal output terminal connected to the battery management system board.
  13. The battery pack of claim 12, characterized in that the at least one battery module comprises a plurality of battery modules, and the at least one cells contact system comprises a plurality of cells contact systems respectively corresponding to the plurality of battery modules; and the plurality of battery modules are sequentially arranged in a transverse direction perpendicular to the longitudinal direction.
  14. The battery pack of claim 13, characterized in that a longitudinal beam (024) is arranged between every two adjacent ones of the plurality of battery modules and connected to an inner wall of the housing.

Description

TECHNICAL FIELD The present application relates to battery technologies, in particular to cells contact sheets, cells contact systems and battery packs. BACKGROUND Generally, a battery pack includes a housing, a battery module, a battery management system (BMS) board, and a cells contact system (CCS) that electrically connects the battery module with the BMS board. The battery module, the BMS board and the CCS are arranged in the housing. The CCS includes a busbar electrically connected to cells of the battery module and a cells contact sheet electrically connected to the busbar and the cells. The cells contact sheet is usually a flexible printed circuit board (FPCB). The cells contact sheet is used to transmit temperature signals and voltage signals of the cells to the BMS board through a harness and a connector in sequence. US 2012/328920 A1 discloses s battery module. The battery module includes: a plurality of connecting members electrically connecting electric terminals of adjacent electric cells; and a flexible flat cable formed by flatly encapsulating an outer circumference of a flat conductor with an insulating resin and joining the plurality of connecting members. Portions of the flexible flat cable to be disposed between adjacent connecting members are provided with folded portions formed by folding the flexible flat cable at folded lines. The folded lines extend in a direction crossing a longitudinal direction of the flexible flat cable. DE 10 2019 134469 A1 discloses a battery connection module including a plurality of busbars, two bridge busbars, an elastic printed circuit board, an electrode unit and a power connection bar. Each bridge busbar has a first collecting section for electrically connecting a first battery pack, a second collecting section for electrically connecting a second battery pack, and a bridge section connected between the two aforementioned. The elastic printed circuit board comprises a cantilever arm and a temperature sensor attached to the cantilever arm, a cutout suitable for receiving the temperature sensor being formed on the busbars. The electrode unit comprises a plate electrode connected to the busbars by an overlap connection, a plate electrode holding part holding the plate electrode, and a current connection base attached to the plate electrode. The power connector has a power connector coupled to the power connector via a buckle connection structure, an alignment structure, a fastener and a socket. US 2022/255141 A1 discloses a battery connection module adapted to connect a plurality of batteries, the battery connection module includes busbars, a circuit board and bridging pieces. The busbars are used to be connected to the batteries. The bridging pieces are connected between the corresponding busbars and the circuit board, each bridging piece has a circuit board connection segment and a busbar connection segment which are arranged along a straight direction and are respectively connected to the circuit board and the corresponding busbar and a buffering segment which is positioned between the circuit board connection segment and the busbar connection segment, the buffering segment includes at least two buffering strips, the at least two buffering strips are constructed as symmetry in a transverse direction with respect to a central line extending along the straight direction, each buffering strip has at least one curving portion. EP 4 195 371 A2 discloses a battery pack for a vehicle. The battery pack includes a battery unit with overlapped battery cells; unit busbars respectively coupled to electrodes at opposite ends of the battery cells and extended upward from the battery unit; unit busbar support bodies located at opposite ends of the battery unit and supporting the unit busbars and the battery cells; a lower tray on which overlapped battery units are loaded and supporting lower surfaces and side surfaces of the battery units; a pressing plate disposed between each of side walls of the lower tray and the battery units and configured to press the battery units in an overlapped direction of the battery units; and a top cover forcibly coupled to the overlapped battery units in a downward direction to cover upper portions of the battery units and configured to supply pressure for the pressing plate to press the battery units. When the battery module includes multiple cell groups, in order to reduce the number of electrical parts and the difficulty of wiring, a cells contact sheet is usually used to acquire the temperature signals and voltage signals of the multiple cell groups. However, during the use of the battery module, a cell may expand due to rising temperature and thus produce tension on the cells contact sheet welded to the cell, so that the weld between the cells contact sheet and the cell may be broken and even the cells contact sheet may be torn. Therefore, the reliability of the acquisition result may be reduced. SUMMARY The invention is set out in