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EP-4510363-B1 - BATTERY

EP4510363B1EP 4510363 B1EP4510363 B1EP 4510363B1EP-4510363-B1

Inventors

  • WEI, Zhida
  • XIE, Jichun
  • LI, XILONG

Dates

Publication Date
20260506
Application Date
20230908

Claims (12)

  1. A battery (10), comprising: a cell (100) comprising a tab (110); a post assembly (200) connected to the tab (110); a connecting sheet assembly (300) connecting the tab (110) and the post assembly (200), wherein the connecting sheet assembly (300) comprises a first connecting sheet (310) and a second connecting sheet (320); one of the first connecting sheet (310) and the second connecting sheet (320) is connected to the tab (110), and the other of the first connecting sheet (310) and the second connecting sheet (320) is connected to the post assembly (200); the first connecting sheet (310) is snapped with the second connecting sheet (320); wherein the first connecting sheet (310) comprises a connecting portion (311) and a plug-in portion (312); the connecting portion (311) is connected to the tab (110), and the plug-in portion (312) is plugged into the second connecting sheet (320); wherein the second connecting sheet (320) comprises a first plate body (321) and a second plate body (322); the first plate body (321) is connected to the post assembly (200), the first plate body (321) and the second plate body (322) are connected to form a slot (320a) with an opening (320b), and the plug-in portion (312) is plugged into the slot (320a) through the opening (320b); characterized in that the first connecting sheet (310) is disposed on a side of the tab (110) facing away from the cell (100); the plug-in portion (312) extends beyond an outer side of the tab (110) along a width direction of the cell (100) and is disposed corresponding to the second plate body (322).
  2. The battery (10) according to claim 1, wherein the second connecting sheet (320) comprises an elastic sheet (323); the elastic sheet (323) is disposed in the second plate body (322), protrudes from a surface of the second plate body (322) facing the first plate body (321), and abuts against the plug-in portion (312).
  3. The battery (10) according to claim 2, wherein the first connecting sheet (310) and the second connecting sheet (320) are located between the tab (110) and the post assembly (200), the second plate body (322) is located on a side of the first plate body (321) facing the cell (100), and a side of the first plate body (321) facing away from the cell (100) is connected to the post assembly (200), along a length direction of the cell (100).
  4. The battery (10) according to claim 2, wherein the opening (320b) of the slot (320a) is disposed along a thickness direction of the cell (100), and the plug-in portion (312) is plugged into the slot (320a) along the thickness direction; and the elastic sheet (323) comprises a fixed end (323a), an abutment portion (3231) and a movable end (323b) along the thickness direction, the fixed end (323a) is connected to the second plate body (322), the movable end (323b) is slidably connected to the second plate body (322), and the abutment portion (3231) abuts against the plug-in portion (312).
  5. The battery (10) according to claim 4, wherein the abutment portion (3231) is slidable along the thickness direction, and the abutment portion (3231) approaches a direction in which the second plate body (322) is located; the abutment portion (3231) abuts against the plug-in portion (312) on a surface of the first plate body (321) facing the second plate body (322).
  6. The battery (10) according to claim 4, wherein the first connecting sheet (310) is a strip-shaped plate; a plurality of elastic sheets (323) are present, and the plurality of elastic sheets (323) are disposed along a length direction of the first connecting sheet (310).
  7. The battery (10) according to claim 6, wherein the first connecting sheet (310) comprises at least one snap-fit protrusion, the snap-fit protrusion is disposed on a surface of the plug-in portion (312) facing the cell (100); the second connecting sheet (320) comprises a snap-fit hole (320c), the snap-fit hole (320c) is disposed in the second plate body (322); the snap-fit hole (320c) is disposed corresponding to the snap-fit protrusion, and the snap-fit hole (320c) is disposed between two adjacent elastic sheets (323); wherein the second plate body (322) is provided with an avoidance hole (322a), the elastic sheet (323) is provided corresponding to the avoidance hole (322a), and the snap-fit hole (320c) is provided between two adjacent avoidance holes (322a); wherein a plurality of snap-fit holes (320c) are present, and the avoidance hole (322a) and the snap-fit hole (320c) are disposed alternatively.
  8. The battery (10) according to claim 7, wherein along the length direction of the first connecting sheet (310), the plurality of elastic sheets (323) are correspondingly disposed in one of the plurality of avoidance holes (322a) close to an edge area of the second plate body (322); and along the thickness direction of the cell (100), the movable end (323b) of part of the elastic sheets (323) is close to the opening (320b) and the movable end (323b) of remaining part of the elastic sheets (323) is far away from the opening (320b); wherein along the thickness direction, a height difference is present between the abutment portion (3231) of the elastic sheet (323) with an movable end (323b) close to the opening (320b) and the abutment portion (3231) of the elastic sheet (323) with an movable end (323b) far from the opening (320b).
  9. The battery (10) according to any one of claims 4-8, wherein the elastic sheet (323) further comprises a first elastic sheet (3232) and a second elastic sheet (3233); along the thickness direction, one end of the abutment portion (3231) is connected to the first elastic sheet (3232) and the other end of the abutment portion (3231) is connected to the second elastic sheet (3233); wherein the second connecting sheet (320) further comprises a sliding guide portion (324); the sliding guide portion (324) is connected to the second plate body (322); one of the first elastic sheet (3232) and the second elastic sheet (3233) forms the movable end (323b) at one end away from the abutment portion (3231), and the other of the first elastic sheet (3232) and the second elastic sheet (3233) forms the fixed end (323a) at one end away from the abutment portion (3231); the movable end (323b) is slidably connected to the sliding guide portion (324); wherein an end of the first elastic sheet (3232) away from the abutment portion (3231) forms the fixed end (323a), an end of the second elastic sheet (3233) away from the abutment portion (3231) forms the movable end (323b), and the movable end (323b) is slidably connected to the sliding guide portion (324).
  10. The battery (10) according to any one of claims 4-8, wherein the first plate body (321) further includes a riveting portion (3211), the riveting portion (3211) is connected to the post assembly (200), and along the length direction of the cell (100), an orthographic projection of the connecting portion (311) on a side surface of the second connecting sheet (320) facing the first connecting sheet (310) is misaligned with the riveting portion (3211).
  11. The battery (10) according to any one of claims 4-8, wherein the abutment portion (3231) of the elastic sheet (323) has a largest distance protruding from the second plate body (322).
  12. The battery (10) according to any one of claims 4-8, wherein when the elastic sheet (323) is in a free state, a distance between the abutment portion (3231) and the first plate body (321) is less than or equal to half of a thickness of the first connecting sheet (310).

Description

This application claims priority to Chinese patent application No. 202222892894.2, entitled "Battery", and filed with the China National Intellectual Property Administration on October 31, 2022 TECHNICAL FIELD This application relates to the technical field of batteries, and in particular to a battery. BACKGROUND With the progress of economic globalization and the extensive use of fossil fuels, the problems of environmental pollution and energy shortage have received increasing attention. Searching a new energy-storage device has become a research hot-topic in the new energy-related field. Batteries have rapidly developed into a new generation of the energy storage device depending on their advantages of high energy density, low self-discharge, good cycle performance, no memory effect and the like. They are used as power support in information technology, electric vehicle, aerospace and other fields. A battery may include a shell, a cell and a post assembly. The cell is located inside the shell. A tab can be extended from one end of the cell. Generally, the tab and the post assembly are connected via a connecting sheet. In the prior art, the tab is connected to a connecting sheet. The post assembly is connected to the other connecting sheet. The two connecting sheets can be connected by a welding process to achieve the connection between the tab and the post assembly. The two connecting sheets are located between the tab and the shell. However, in order to ensure the energy density of the battery, a space between the tab and the shell is usually set smaller, so that a welding space configured between the two connecting sheets is smaller, which easily leads to inconvenience in welding and affects the assembly efficiency of the battery. WO2017194411A1 discloses an electrochemical cell having a prismatic cell housing and an electrode assembly disposed in the cell housing. The cell housing is six-sided and includes a first end, a second end, and a sidewall that extends between the first and second ends. The sidewall includes a pair of major sides joined by a pair of minor sides, where each side of the pair of major sides is larger in area than each side of the pair of minor sides. The electrode assembly includes positive electrode plates alternating with negative electrode plates and separated by at least one separator to form an electrode stack. The electrode stack is oriented within the cell housing such that a stack axis that extends parallel to a stacking direction of the positive and negative electrode plates is normal to, and passes through, each side of the pair of minor sides. CN112290167A relates to the field of batteries, in particular to a single battery, a manufacturing method of the single battery, a battery and an electric device. Specifically, the single battery includes: a shell, which is equipped with a first opening; an end cover, which is used for sealing the first opening, and is provided with an electrode terminal; an electrode assembly, which is accommodated in the shell, is provided with a tab facing the first opening; a switching assembly, which is located between the end cover and the electrode assembly and used for electrically connecting the electrode terminal and the tab, and comprises a first switching piece and a second switching piece; wherein the first switching piece is fixed with the electrode terminal, the second switching piece is fixed with the tab, and the first switching piece is configured to be rotationally clamped with the second switching piece, so that the electrode terminal is electrically connected with the tab. SUMMARY This application provides a battery, which can solve the problem that the relatively complicated welding process affects the assembling efficiency of the battery since a connecting sheet on the tab and a connecting sheet on the post assembly are connected via the welding process. The invention is set out in the appended set of claims. This application provides a battery, including: a cell including a tab;a post assembly connected to the tab;a connecting sheet assembly connecting the tab and the post assembly, where the connecting sheet assembly includes a first connecting sheet and a second connecting sheet; one of the first connecting sheet and the second connecting sheet is connected to the tab, and the other of the first connecting sheet and the second connecting sheet is connected to the post assembly; the first connecting sheet is snapped with the second connecting sheet. The first connecting sheet can be connected to the tab in the battery provided in this application. The second connecting sheet can be connected to the post assembly. The first connecting sheet and the second connecting sheet can be connected by a snap-fit manner in an embodiment of this application. The connection between the first connecting sheet and the second connecting sheet can be achieved manually or through a simple operating tool by a worker, thereby reducing a possib