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EP-4738556-A1 - SNAP-FIT STRUCTURE FOR COVER PLATE AND CELL BRACKET, AND BATTERY MODULE

EP4738556A1EP 4738556 A1EP4738556 A1EP 4738556A1EP-4738556-A1

Abstract

Provided are a snap-fit structure for a cover plate and a cell bracket, and a battery module, which relate to the technical field of batteries. The snap-fit structure includes a first member (1) and a second member (2). The first member (1) has a clamping hole (11). The clamping hole (11) includes a first hole portion (111), a connecting portion (113) and a second hole portion (112) that are disposed and connected in sequence. The clamping hole (11) is contracted at the connecting portion (113). The second member (2) includes a base (21) and a first snap (22) and a second snap (23) that are disposed on a surface of the base (21). The first snap (22) is engaged with the first hole portion (111), and the second snap (23) is engaged with the second hole portion (112).

Inventors

  • XIONG, Fengsheng

Assignees

  • Eve Energy Co., Ltd.

Dates

Publication Date
20260506
Application Date
20251030

Claims (10)

  1. A snap-fit structure for a cover plate and a cell bracket, comprising: a first member (1) with a clamping hole (11), wherein the clamping hole (11) comprises a first hole portion (111), a connecting portion (113) and a second hole portion (112) that are disposed and connected in sequence, and the clamping hole (11) is contracted at the connecting portion (113); and a second member (2) comprising a base (21) and a first snap (22) and a second snap (23) that are disposed on a surface of the base (21), wherein the first snap (22) is engaged with the first hole portion (111), and the second snap (23) is engaged with the second hole portion (112).
  2. The snap-fit structure for the cover plate and the cell bracket according to claim 1, wherein the first hole portion (111) and the second hole portion (112) are both rectangular holes, the first hole portion (111) and the second hole portion (112) are disposed at intervals in parallel along a first direction and are arranged in a staggered manner along a second direction, and the first direction is perpendicular to the second direction.
  3. The snap-fit structure for the cover plate and the cell bracket according to claim 2, wherein the first snap (22) and the second snap (23) are disposed at intervals along the first direction, and along the first direction, an interval between the first snap (22) and the second snap (23) is greater than an interval between the first hole portion (111) and the second hole portion (112).
  4. The snap-fit structure for the cover plate and the cell bracket according to claim 3, wherein the first snap (22) has a first connecting portion (221) and a first snap-fit protrusion portion (222) vertically connected to an end of the first connecting portion (221), and the first snap-fit protrusion portion (222) is capable of passing through the first hole portion (111) and abutting against the first member (1); and the second snap (23) has a second connecting portion (231) and a second snap-fit protrusion portion (232) vertically connected to an end of the second connecting portion (231), and the second snap-fit protrusion portion (232) is capable of passing through the second hole portion (112) and abutting against the first member (1).
  5. The snap-fit structure for the cover plate and the cell bracket according to claim 4, wherein the first connecting portion (221) and the second connecting portion (231) are parallel and face each other, and wherein the first snap-fit protrusion portion (222) and the second snap-fit protrusion portion (232) are parallel and face away from each other.
  6. The snap-fit structure for the cover plate and the cell bracket according to claim 5, wherein the second member (2) further comprises two support bodies (24) disposed on the surface of the base (21), the two support bodies (24) are disposed at intervals along the second direction, the first snap (22) and the second snap (23) are located between the two support bodies (24), and the two support bodies (24) are capable of abutting against the first member (1).
  7. The snap-fit structure for the cover plate and the cell bracket according to claim 6, wherein a distance between each of the two support bodies (24) and the surface of the base (21) is H1, and both a minimum distance between the first snap-fit protrusion portion (222) and the surface of the base (21) and a minimum distance between the second snap-fit protrusion portion (232) and the surface of the base (21) are H2, wherein 0.2 mm ≤ H1-H2 ≤ 0.4 mm.
  8. The snap-fit structure for the cover plate and the cell bracket according to any one of claims 2 to 7, wherein the connecting portion (113) is a rectangular hole, and for two sides of the connecting portion (113) that are disposed oppositely, one side coincides with one side of the first hole portion (111), and the other side coincides with one side of the second hole portion (112).
  9. The snap-fit structure for the cover plate and the cell bracket according to claim 8, wherein a length of the connecting portion (113) along the first direction is L1, and an interval between the first snap (22) and the second snap (23) along the first direction is L2, wherein 0.15 mm ≤ L2-L1 ≤ 0.25 mm.
  10. A battery module, comprising: a box body (300), a cover plate (100), a cell bracket (200) and a cell group (400), wherein both the cell bracket (200) and the cell group (400) are installed in the box body (300), and the cover plate (100) is engaged with the cell bracket (200) via the snap-fit structure for the cover plate and the cell bracket according to any one of claims 1 to 9.

Description

TECHNICAL FIELD The present application relates to the technical field of batteries, for example, a snap-fit structure for a cover plate and a cell bracket, and a battery module. BACKGROUND A battery module mainly includes a battery box, a cell bracket and a cell group. The cell bracket is used for fixing the cell group, and both the cell bracket and the cell group are installed in the battery box. For the assembly of the cell group, the battery box is generally designed as a detachable split assembly structure. For example, the battery box includes a box body and a cover plate. After the cell bracket and the cell group are installed in the box body, the cover plate is assembled. In the related art, in order to reduce costs and increase efficiency, a polycarbonate (PC) plate is generally selected as a cover plate, and the cover plate is engaged with a cell bracket via circular snap-fits. Owing to a snap head on the cell bracket larger than the corresponding clamping hole on the cover plate and the inherently low mechanical strength of the PC plate, it renders the clamping hole susceptible to being split open during the engagement process. This causes the PC plate to be scrapped, thereby increasing production costs.. However, an increase in the dimension of the clamping hole, intended as a preventative measure against damage to the PC plate, introduces a propensity for an insubstantial engagement. This, in turn, leads to installation failures, degradation in product quality, and an elevated product defect rate. SUMMARY The present application provides a snap-fit structure for a cover plate and a cell bracket, and a battery module so that a damage rate of the cover plate during assembly can also be reduced even if a PC plate is selected as the cover plate, thereby reducing a cost and improving the yield rate of the product. In a first aspect, the present application provides a snap-fit structure for a cover plate and a cell bracket. The snap-fit structure for the cover plate and the cell bracket includes a first member and a second member. The first member has a clamping hole, where the clamping hole includes a first hole portion, a connecting portion and a second hole portion that are disposed and connected in sequence, and the clamping hole is contracted at the connecting portion. The second member includes a base and a first snap and a second snap that are disposed on a surface of the base, where the first snap is engaged with the first hole portion, and the second snap is engaged with the second hole portion. In a second aspect, the present application provides a battery module. The battery module includes a box body, a cover plate, a cell bracket and a cell group, where both the cell bracket and the cell group are installed in the box body, and the cover plate is engaged with the cell bracket via the snap-fit structure for the cover plate and the cell bracket provided in the first aspect. The present application has the beneficial effects below. The snap-fit structure provided in the present application includes a first member and a second member. For a clamping hole of the first member, a connecting portion can share acting forces in a process of snapping a first snap into a first hole portion and snapping a second snap into a second hole portion, thereby avoiding the tearing of the clamping hole due to an excessive snap force. In addition, since the clamping hole is contracted at the connecting portion, the snap strength between the first snap and the first hole portion and the snap strength between the second snap and the second hole portion can be ensured, and a defect of loose engagement caused by a manufacturing tolerance and a reserved gap can be eliminated, thereby improving the connection strength. A snap-fit structure is applied to the battery module of the present application so that a damage rate of a cover plate during assembly can also be reduced even if a PC plate is selected as the cover plate of the battery module, thereby reducing a cost and improving the yield rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating a structure of a cover plate and a cell bracket after assembly according to some embodiments of the present application.FIG. 2 is a schematic diagram illustrating a structure of a cover plate and a cell bracket before assembly according to some embodiments of the present application.FIG. 3 is a schematic diagram illustrating a structure of a snap-fit structure after assembly according to some embodiments of the present application is assembled.FIG. 4 is a schematic diagram illustrating a structure of a snap-fit structure before assembly according to some embodiments of the present application.FIG. 5 is a schematic diagram illustrating a structure of a battery module according to some embodiments of the present application. Reference list 100cover plate200cell bracket300box body400cell group1first member11clamping hole111first hole po