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CN-121546244-B - Cover plate structure, cover plate assembly and battery cell

CN121546244BCN 121546244 BCN121546244 BCN 121546244BCN-121546244-B

Abstract

The invention relates to the technical field of batteries and discloses a cover plate structure, a cover plate assembly and an electric core. The cover plate structure comprises a cover plate body, a plurality of reinforcing structures, a plurality of sinking grooves or convex hulls, wherein the cover plate body is provided with a plurality of mounting through holes, the thickness of the cover plate body along the Z direction is T, the reinforcing structures are constructed on the cover plate body, the reinforcing structures are arranged at intervals, the reinforcing structures and the mounting through holes are arranged at intervals, the reinforcing structures are sinking grooves or convex hulls, the sinking grooves are formed by sinking at least part of the surface of the cover plate body along the Z direction, the depth of the sinking grooves along the Z direction is T, the relation between T and T is 0<t/T less than or equal to 0.4, the convex hulls protrude from the surface of the cover plate body along the Z direction, the protruding heights are h, and the relation between h and T is 0<h/T less than or equal to 3. The structure strength of the cover plate body can be enhanced without increasing the thickness of the cover plate body, so that the cover plate structure is ensured to have enough structure strength, the weight is reduced, and the material cost is reduced.

Inventors

  • LIU JIE
  • MA YONGGUI
  • YUAN YUE

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260115

Claims (6)

  1. 1. A cover plate structure, comprising: the cover plate body is provided with a plurality of mounting through holes, and the thickness of the cover plate body along the Z direction is T; The reinforcing structures are constructed on the cover plate body, the reinforcing structures are arranged at intervals, the reinforcing structures and the mounting through holes are arranged at intervals, and the reinforcing structures are sink grooves; Globally disposing the reinforcing structure on the cover plate body except for the mounting through hole; the sinking groove is formed by sinking at least part of the area of the surface of the cover plate body along the Z direction, the depth of the sinking groove along the Z direction is T, and the T and the T meet the relational expression that 0<t/T is less than or equal to 0.4; the cover plate body is provided with two first side edges which are oppositely arranged along the Y direction and two second side edges which are oppositely arranged along the X direction; The sinking groove comprises a first rectangular groove, wherein the first rectangular groove is arranged between the mounting through hole and the first side edge and between two adjacent mounting through holes, the first rectangular groove is provided with two first long edges which are oppositely arranged along the Y direction and two first wide edges which are oppositely arranged along the X direction, the dimension of the first long edge along the X direction is L1, the dimension of the first wide edge along the Y direction is W1, wherein L1 is more than or equal to W1, and L1/W1 is more than or equal to 1 and less than or equal to 4; The sinking groove comprises a second rectangular groove, wherein the second rectangular groove is arranged between the mounting through hole and the second side edge and between two adjacent mounting through holes, the second rectangular groove is provided with two second long edges which are oppositely arranged along the X direction and two second wide edges which are oppositely arranged along the Y direction, the dimension of the second long edge along the Y direction is L2, the dimension of the second wide edge along the X direction is W2, wherein L2 is more than or equal to W2, and L2/W2 is more than or equal to 1 and less than or equal to 4; The value range of L1 is 0.5 mm-40 mm, the value range of W1 is 0.5-mm-40 mm, the value range of L2 is 0.5-mm-40 mm, and the value range of W2 is 0.5-mm-40 mm.
  2. 2. The cover plate structure according to claim 1, wherein the thickness T of the cover plate body along the Z direction is in a range of 0.5 mm-10 mm; And/or the value range of the groove depth t of the sinking groove along the Z direction is 0<t-4 mm.
  3. 3. The cover plate structure according to claim 1, wherein the reinforcing structure is a sink groove, the distance between two adjacent sink grooves along the X direction and/or the Y direction is g1, and the relation between g1 and t is 0.5-10 g 1/t-20 mm g 1-0.5 mm.
  4. 4. A cover structure according to any one of claims 1 to 3, wherein the edge distance between the reinforcing structure and the edge of the cover body in the X-direction and/or Y-direction is E, wherein 2 mm-E-30 mm.
  5. 5. A cover plate assembly, comprising: the cover structure of any one of claims 1 to 4, the mounting through holes in the cover structure comprising post holes; and the pole is penetrated in the pole hole.
  6. 6. A kind of electric core, characterized by comprising the following steps: A housing having an open end; the pole group is arranged in the inner cavity of the shell; the cover assembly of claim 5, wherein a cover is provided at the open end of the housing.

Description

Cover plate structure, cover plate assembly and battery cell Technical Field The invention relates to the technical field of batteries, in particular to a cover plate structure, a cover plate assembly and an electric core. Background The cover plate body is an important component part of a cover plate assembly, and the cover plate assembly comprises a cover plate body, and a pole column, an explosion-proof valve and other structures integrated on the cover plate body. The cover plate assembly is used for being assembled and welded with the shell so as to encapsulate the pole group inside the shell. When the electric core is in jolt vibration environment, the apron subassembly position can receive great shearing force impact, if apron body intensity is not enough, can lead to the weak areas such as cap welding position to appear damaging the inefficacy. The apron body among the prior art is the platy in general, and structural strength is relatively poor, if through increasing the thickness of apron body and improving its structural strength, can increase the material cost and the weight of apron body, and then increase the cost and the weight of electric core, is unfavorable for realizing electric core lightweight. Disclosure of Invention In view of the above, the present invention provides a cover structure, a cover assembly and a battery cell, so as to solve the problems of poor structural strength, high cost and heavy weight of the cover body. The invention provides a cover plate structure, which comprises a cover plate body, a plurality of reinforcing structures and a convex hull, wherein the cover plate body is provided with a plurality of mounting through holes, the thickness of the cover plate body along the Z direction is T, the reinforcing structures are constructed on the cover plate body, the reinforcing structures are arranged at intervals and are arranged at intervals with the mounting through holes, the reinforcing structures are sunken grooves or convex hulls, the sunken grooves are formed by recessing at least partial areas of the surface of the cover plate body along the Z direction, the groove depth of the sunken grooves along the Z direction is T, the relation between T and T is 0<t/T less than or equal to 0.4, the convex hulls protrude out of the surface of the cover plate body along the Z direction, the protruding height is h, and the relation between h and T is 0<h/T less than or equal to 3. The cover plate structure has the advantages that the cover plate body is provided with the plurality of mutually-spaced sinking grooves or convex hulls, so that the surface of the cover plate body forms a concave-convex alternate structural form, the structural strength of the cover plate body can be enhanced, when the reinforcing structure is the sinking groove, the ratio T/T between the groove depth of the sinking groove and the thickness of the cover plate body is larger than 0 and smaller than or equal to 0.4, the groove depth of the sinking groove is designed in a reasonable range, the structural reinforcing effect is prevented from being lost due to overlarge groove depth relative to the thickness of the cover plate body, the sinking groove is formed on the cover plate body, the structural strength of the cover plate body can be effectively enhanced, when the reinforcing structure is the convex hull, the ratio h/T between the height of the convex hull relative to the surface of the cover plate body and the thickness of the cover plate body is larger than 0 and smaller than or equal to 3, the convex hull can be formed on the cover plate body smoothly, the forming yield of the cover plate structure is ensured, the structural strength of the cover plate body is effectively enhanced, the cover plate structure can be enhanced under the condition that the thickness of the cover plate body is not required to be increased, the cover plate structure is ensured to have enough structural strength, and light weight is reduced. In an alternative embodiment, the thickness T of the cover plate body along the Z direction is in the range of 0.5 mm-10 mm; And/or the value range of the groove depth t of the sinking groove along the Z direction is 0<t-4 mm; And/or the value range of the height h of the convex hull protruding out of the surface of the cover plate body along the Z direction is 0<h-30 mm. The cover plate body has reasonable thickness by limiting the value of T between 0.5 mm and 10 mm, so that the cover plate body has enough structural strength, the reliability of the cover plate body and the safety of the battery cell are ensured, the waste of materials is avoided, the weight of the cover plate body is reduced, and the weight of the battery cell is reduced; And/or, through limiting the groove depth t of the sinking groove to be more than 0 and less than or equal to 4mm, the sinking groove is ensured to have reasonable groove depth, not only can the sinking groove formed on the cover plate body be