Search

EP-4250439-B1 - BATTERY

EP4250439B1EP 4250439 B1EP4250439 B1EP 4250439B1EP-4250439-B1

Inventors

  • WEI, Zhida
  • LI, XILONG
  • WANG, ZHIFENG
  • PENG, NING

Dates

Publication Date
20260506
Application Date
20230314

Claims (15)

  1. A battery, comprising: a housing (1) enclosed to form a chamber and comprising a first side plate (11); a cell (2) located in the chamber and provided with a first tab (21); and a first adapter (31) electrically connected with the first tab (21), wherein the first adapter (31)is disposed between the first side plate (11) and the cell (2), and a projection of the first adapter (31) on the first side plate (11) does not overlap with a projection of the first tab (21) on the first side plate (11), and wherein the battery further comprises a first connector located between the cell (2) and the first side plate (11) and connected with the first tab (21) and the first adapter (31), respectively, and the first connector comprises a first connection sheet (51) connected with the first adapter (31) and a fourth connection sheet (54) connected with a side of the first tab (21) facing away from the cell (2).
  2. The battery according to claim 1, wherein the housing (1) comprises a second side plate (12) connected with the first side plate (11), and a projection of the first adapter (31) on the second side plate (12) at least partially overlaps with a projection of the first tab (21) on the second side plate (12); and/or, an end surface of a side of the cell (2) provided with the first tab (21) is parallel with a width direction of the cell (2); and/or, a distance from a side of the first tab (21) facing away from the cell (2) to a side of the first tab (21) connected with the cell (2) is not greater than a length of the first adapter (31) along a direction from the first side plate (11) to the first tab (21); and/or, along the direction from the first side plate (11) to the first tab (21), a length of the first adapter (31) is 1 mm-3 mm.
  3. The battery according to claim 1, wherein the battery further comprises an external connector (41) disposed on a side of the first side plate (11) facing away from the chamber, the external connector (41) comprises an outward-protruding post (42) and the first adapter (31) comprises a first through hole (310) corresponding to the post (42), and the post (42) penetrates through the first side plate (11) and is connected with the first adapter (31) through the first through hole (310).
  4. The battery according to claim 3, wherein the first through hole (310) of the first adapter (31) comprises a first hole section and a second hole section which are connected with each other, and the second hole section is located on a side of the first hole section close to the cell (2); and an end of the post (42) close to the cell (2) extends outward to form an extension part (43) corresponding to the second hole section; and/or, an end surface of the post (42) close to the cell (2) is flush with a side surface of the first adapter (31) close to the cell (2).
  5. The battery according to claim 3, wherein an end of the post (42) close to the cell (2) protrudes out of the first through hole (310) and extends outward along a circumferential direction of the first through hole (310) to form an extension part (43) connected with a side surface of the first adapter (31) close to the cell (2).
  6. The battery according to claim 3, wherein a first insulation sheet (6) is also disposed between the external connector (41) and the first side plate (11), and a second insulation sheet (7) is also disposed between the first adapter (31) and the first side plate (11), and the post (42) penetrates through the first insulation sheet (6) and the second insulation sheet (7); and/or, a first insulation layer (8) is disposed between the post (42) and the first side plate (11); and/or, a second insulation layer (82) is disposed between the first adapter (31) and the cell (2).
  7. The battery according to claim 6, wherein, a projection of the first insulation sheet (6) on the first side plate (11) covers a projection of the external connector (41) on the first side plate (11); and/or, a projection of the second insulation sheet (7) on the first side plate (11) covers a projection of the first adapter (31) on the first side plate (11); optionally, the battery comprises a plurality of electrode sheets arranged in a laminated manner, the cell (2) has a first face and a second face that are disposed opposite to each other, wherein the second insulation layer (82) extends to the first face of the cell (2) and is bonded to the electrode sheet located on the first face of the cell (2), and/or, the second insulation layer (82) extends to the second face of the cell (2) and is bonded to the electrode sheet located on the second face of the cell (2).
  8. The battery according to claim 1, wherein the first connector further comprises a connection component connected with the first connection sheet (51) and the fourth connection sheet (54), respectively; the connection component comprises a second connection sheet (52) and a third connection sheet (53); the second connection sheet (52) is located between the first adapter (31) and the cell (2); the third connection sheet (53) is located between the first tab (21) and the first adapter (31) in a direction from the first adapter (31) to the first tab (21); and the first connection sheet (51), the second connection sheet (52), the third connection sheet (53) and the fourth connection sheet (54) are sequentially connected; optionally, the first connection sheet (51) comprises a first connection part (511) connected with the first adapter (31) and a second connection part (512) extending in an extension direction of the first side plate (11), and the second connection part (512) is connected with the fourth connection sheet (54); optionally, a side of the first connection sheet (51) facing away from the first adapter (31) is further provided with a sixth insulation layer (86); and/or, a first included angle is formed between a surface of the first adapter (31) connected with the first connection sheet (51) and a surface of the fourth connection sheet (54) connected with the first tab (21), and the first included angle is in a range of 80°-120°; and/or, the first connection sheet (51) is welded with the first adapter (31); and/or, the cell (2) comprises a plurality of electrode sheets arranged in a laminated manner, and a surface of first connection sheet (51) connected with the first adapter (31) is parallel with a surface of the electrode sheet.
  9. The battery according to claim 1, wherein the battery further comprises a third insulation layer (83) located between the first connector and the first side plate (11).
  10. The battery according to claim 9, wherein the third insulation layer (83) comprises a first portion located on a surface of the fourth connection sheet (54) facing away from the first tab (21).
  11. The battery according to claim 10, wherein the cell (2) comprises a plurality of electrode sheets arranged in a laminated manner; the cell (2) has a first face and a second face that are disposed opposite to each other; the third insulation layer (83) further comprises a second portion formed by extending from an end of the first portion close to the first face of the cell (2) to a direction close to the cell (2) and a third portion formed by extending from an end of the first portion close to the second face of the cell (2) to the direction close to the cell (2).
  12. The battery according to claim 11, wherein a projection of the first tab (21) in a thickness direction of the cell (2) is located within a projection of the second portion of the third insulation layer (83) in the thickness direction of the cell (2); and/or, the projection of the first tab (21) in a thickness direction of the cell (2) is located within a projection of the third portion of the third insulation layer (83) in the thickness direction of the cell (2); and/or, a projection of the first tab (21) in a length direction of the cell (2) is located within a projection of the first portion of the third insulation layer (83) in the length direction of the cell (2); optionally, the second portion of the third insulation layer (83) extends to the first face of the cell (2) and is bonded to the electrode plate located on the first face of the cell (2); and/or, the third portion of the third insulation layer (83) extends to the second face of the cell (2) and is bonded to the electrode plate located on the second face of the cell (2).
  13. The battery according to claim 1, wherein the cell (2) comprises a plurality of electrode sheets arranged in a laminated manner, the electrode plate comprises a first current collector, and the first tab (21) is disposed on the first current collector; and a distance between the first adapter (31) and the first current collector is less than 1 mm in a direction from the first adapter (31) to the cell (2); optionally, the cell (2) is further provided with a second tab (22), the second tab (22) and the first tab (21) having opposite polarities; and the battery further comprises a second adapter (32) electrically connected with the second tab (22), and the second adapter (32) is disposed between the first side plate (11) and the cell (2), and a projection of the second adapter (32) on the first side plate (11) does not overlap with a projection of the second tab (22) on the first side plate (11).
  14. The battery according to claim 13, wherein the housing (1) comprises a second side plate (12) connected with the first side plate (11), and a projection of the first tab (21) on the second side plate (12) at least partially overlaps with a projection of the second tab (22) on the second side plate (12); and/or, a projection of the second adapter (32) on the second side plate (12) at least partially overlaps with the projection of the second tab (22) on the second side plate (12); and/or, the first tab (21) and the second tab (22) are located between the first adapter (31) and the second adapter (32); and/or, the second adapter (32) is welded with the first side plate (11); and/or, a distance between a side of the second tab (22) facing away from the cell (2) to a side of the second tab (22) connected with the cell (2) is not greater than a length of the second adapter (32) in a direction from the first side plate (11) to the second tab (22); and/or, the length of the second adapter (32) is 1 mm-4 mm in the direction from the first side plate (11) to the second tab (22); and/or, the length of the second adapter (32) is equal to or greater than a length of the first adapter (31) in the direction from the first side plate (11) to the second tab (22).
  15. The battery according to claim 1, wherein the housing (1) comprises a fifth side plate (15) connected with the first side plate (11), the fifth side plate (15) is provided with a thinning part (151), and a mechanical strength of the thinning part (151) is less than a mechanical strength of other portions of the housing (1) except for the thinning part (151), and/or the cell (2) comprises a plurality of electrode sheets arranged in a laminated manner, a surface of the fifth side plate (15) is parallel with a surface of the electrode sheet.

Description

TECHNICAL FIELD The present invention relates to the field of electrochemical energy storage devices, in particular, to batteries. BACKGROUND At present, electrochemical devices represented by batteries are widely used. For example, lithium-ion batteries have the advantages of large capacity, small size, light weight and environmental friendliness, and have been widely applied to digital electronic products and electric vehicles and other industries. With the development of science and technology, the requirements for battery performance such as energy density are getting higher and higher, therefore, it is urgent to improve the energy density of battery. EP2793294A1 describes a rechargeable battery (100) including an electrode assembly (10) that is adapted to perform a charge and discharge operation; a case (15) that houses the electrode assembly (10); a cap plate (20) coupled to and closing an opening of the case (15); an electrode terminal (21, 22); and a lead tab (51) that connects the electrode assembly (10) to the electrode terminal (21, 22), wherein the lead tab (51) includes a current collecting connection portion (511) that is connected to the electrode assembly (10); a terminal connection portion (512) that is bent from the current collecting connection portion (511) to be connected to the electrode terminal (10); and a synthetic material (514) that embeds the terminal connection portion (512) in which a fuse (513) is formed. CN113381104A describes a cover plate assembly for the battery including a top cover; a conductive structure arranged on the top cover, the conductive structures including at least one pole for conducting electricity; at least one connection structure, a first end of each connection structure being electrically connected to a corresponding pole, a second end of the each connection structure being electrically connected to a tab of a cell, and the second end of the each connection structure being provided with an installation hole; and a locking structure including at least one locking member. US2019/319295A1 describes a rechargeable battery, including: an electrode assembly formed by disposing an electrode having coated regions and uncoated tabs at opposite sides of a separator; a case configured to accommodate the electrode assembly therein; a cap plate coupled to an opening of the case; and electrode terminals insert-molded into terminal holes of the cap plate to be connected to the uncoated tabs, wherein the electrode terminal includes: an external terminal portion configured to protrude outside of the cap plate; an internal terminal portion disposed within the cap plate to be connected to the uncoated tabs; and a connector configured to connect the external terminal portion and the external portion, and disposed in the terminal hole to be insulated by a molding resin material. EP2575189A1 discloses a rechargeable battery comprising: a housing, an electrode assembly including a first electrode and a second electrode and situated within the housing; a first electrode terminal; and a first current collecting member; wherein the first current collecting member comprises a terminal connection portion that is electrically connected to the first electrode terminal and a current collecting piece that is electrically connected to the first electrode. SUMMARY The present invention is set out in the appended set of claims. The present invention provides a battery, which may improve the energy density of the battery. The present invention provides a battery including: a housing enclosed to form a chamber, the housing including a first side plate; a cell located in the chamber and provided with a first tab; and a first adapter electrically connected with the first tab, wherein the first adapter is disposed between the first side plate and the cell, and a projection of the first adapter on the first side plate does not overlap with a projection of the first tab on the first side plate. According to an implementation of the present invention, the housing includes a second side plate connected with the first side plate, and a projection of the first adapter on the second side plate at least partially overlaps with a projection of the first tab on the second side plate. According to an implementation of the present invention, an end surface of a side of the cell provided with the first tab is parallel with a width direction of the cell; and/or, a distance from a side of the first tab facing away from the cell to a side of the first tab connected with the cell is not more than a length of the first adapter along a direction from the first side plate to the first tab; and/or, along the direction from the first side plate to the first tab, a length of the first adapter is 1 mm-3 mm. According to an implementation of the present invention, the battery further includes an external connector disposed on a side of the first side plate facing away from the chamber, the external connector includes