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CN-122000568-A - Battery cell cover plate assembly and battery cell

CN122000568ACN 122000568 ACN122000568 ACN 122000568ACN-122000568-A

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell cover plate assembly and a battery cell. The battery core cover plate assembly comprises a cover plate, a lower plastic, a connecting sheet and a second plastic injection hole, wherein a groove is formed in the lower surface of the cover plate along the Z direction, the lower plastic is positioned on the lower surface of the cover plate, a first plastic injection hole communicated with a groove opening of the groove is formed in the lower plastic, the connecting sheet is positioned on one side of the lower surface of the lower plastic along the Z direction, the second plastic injection hole is communicated with the first plastic injection hole, and insulating glue layers are filled in the groove, the first plastic injection hole and the second plastic injection hole. According to the invention, the grooves are formed in the lower surface of the cover plate, the first glue injection hole of the lower plastic and the second glue injection hole of the connecting sheet are communicated with the grooves, and the insulating glue layer is filled in the grooves, so that the insulating glue layer can stably support and limit the connecting sheet, the traction stress of the electrode group or the electrode lug to the connecting sheet when the battery cell is subjected to external force is effectively dispersed, the connecting sheet is prevented from deforming, and gaps or cracks are prevented from occurring at welding positions of the connecting sheet, the electrode post and the electrode lug.

Inventors

  • Xu tongli

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (10)

  1. 1. A battery cell cover assembly, comprising: the cover plate is provided with a groove along the Z direction on the lower surface; the lower plastic is positioned on the lower surface of the cover plate, and a first glue injection hole communicated with the groove opening of the groove is formed in the lower plastic; the connecting piece is located lower plastic is in lower surface one side of Z direction to be equipped with the second injecting glue hole that is linked together of first injecting glue hole, the recess first injecting glue hole and the downthehole insulating glue layer that has filled of second injecting glue.
  2. 2. The cell cover assembly of claim 1, wherein the cross-sectional area of the groove in the X-Y plane becomes progressively larger from the mouth of the groove to the bottom of the groove.
  3. 3. The cell cover plate assembly according to claim 2, wherein the groove is in a shape of a truncated cone, an included angle between a groove wall of the groove and a central axis of the groove is A, and a value of A is more than or equal to 10 degrees and less than or equal to 45 degrees.
  4. 4. The cell cover assembly according to claim 1, wherein the cover has a thickness a in the Z direction, a has a value of 1mm or less and a or less and 3mm or less, and the recess has a depth b having a value of 0.5mm or less and b or less and 0.75 x a or less.
  5. 5. The cell cover plate assembly according to claim 1, wherein the second glue injection hole comprises a first through hole and a second through hole which are communicated, the cross-sectional area of the first through hole is larger than that of the second through hole in an X-Y plane, a step surface is arranged at the joint of the first through hole and the second through hole, and the second through hole is positioned on one side of the second glue injection hole close to the cover plate.
  6. 6. The battery cell cover plate assembly according to claim 1, wherein the upper surface of the cover plate protrudes in a direction away from the lower plastic to form a convex hull, the convex hull forms a containing groove on the lower surface side of the cover plate, the lower plastic is provided with an avoidance hole, and the battery cell cover plate assembly further comprises a heat conducting pad, at least part of which penetrates through the avoidance hole and is clamped between the groove bottom of the containing groove and the upper surface of the connecting sheet.
  7. 7. The cell cover assembly of claim 6, wherein a space c is left between the outer side wall of the heat conducting pad and the wall of the avoidance hole in the X-Y plane, and the value range of c is more than or equal to 0.5mm and less than or equal to 3mm.
  8. 8. The battery cell cover plate assembly according to claim 6, wherein the thickness of the heat conducting pad is d in the Z direction, d is greater than or equal to 1mm and less than or equal to 3mm, and the thickness of the heat conducting pad is greater than the thickness corresponding to the portion of the lower plastic sandwiched between the cover plate and the connecting sheet.
  9. 9. A kind of electric core, characterized by comprising the following steps: a housing having an opening at one end thereof in a Z direction; the electrode group is arranged in the shell, and one end of the electrode group, which is close to the opening, is provided with a tab; The cell cover assembly of any one of claims 1 to 8, the cover being disposed over the opening, the lower plastic being located within the housing; A pole, one end of which is positioned in the shell, and the other end of which passes through the cover plate and is positioned outside the shell; one end of the connecting sheet is electrically connected with the part of the pole column positioned in the shell, and the other end of the connecting sheet is electrically connected with the pole lug.
  10. 10. The battery cell according to claim 9, wherein the electrode posts comprise positive electrode posts and negative electrode posts which are arranged at intervals along the X direction, the electrode lugs are positioned between the positive electrode posts and the negative electrode posts, the electrode lugs comprise positive electrode lugs and negative electrode lugs which are arranged at intervals along the X direction, one connecting piece is connected with the positive electrode posts and the other connecting piece is connected with the negative electrode posts, avoidance holes which are arranged in one-to-one correspondence with the pair of connecting pieces are formed in the lower plastic, and the battery cell further comprises a pair of heat conducting pads which are arranged in one-to-one correspondence with the pair of connecting pieces and are clamped between the upper surfaces of the corresponding connecting pieces and the lower surfaces of the cover plates through the corresponding avoidance holes.

Description

Battery cell cover plate assembly and battery cell Technical Field The invention relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell. Background In the cell structure, the connecting sheet is used as an electric connecting part of the pole post and the pole lug, and plays a role in realizing electric conduction of the pole post and the pole lug and guaranteeing stable transmission of current in the cell. However, in the actual use stage of the battery cell, if the battery cell is subjected to the action of external force, the connecting sheet is easy to deform due to the traction action of the pole group or the pole lug, so that gaps and even cracks occur at the welding positions of the connecting sheet, the pole post and the pole lug, and the use safety and the service life of the battery cell are adversely affected. Disclosure of Invention The invention provides a battery cell cover plate assembly and a battery cell, which are used for solving the problem that a connecting sheet is easy to deform under the traction action of a pole group or a pole lug. In a first aspect, the present invention provides a cell cover assembly comprising: the cover plate is provided with a groove along the Z direction on the lower surface; the lower plastic is positioned on the lower surface of the cover plate, and a first glue injection hole communicated with the groove opening of the groove is formed in the lower plastic; the connecting piece is located lower plastic is in lower surface one side of Z direction to be equipped with the second injecting glue hole that is linked together of first injecting glue hole, the recess first injecting glue hole and the downthehole insulating glue layer that has filled of second injecting glue. The integrated fixing structure of the cover plate, the lower plastic and the connecting sheet has the beneficial effects that the grooves are formed in the lower surface of the cover plate, the first glue injection hole of the lower plastic and the second glue injection hole of the connecting sheet are communicated with the grooves, and the insulating glue layers are filled in the grooves, so that the integrated fixing structure of the cover plate, the lower plastic and the connecting sheet is formed. On one hand, the insulating adhesive layer can play a firm supporting and limiting role on the connecting sheet, effectively disperses the traction stress of the electrode group or the electrode lug on the connecting sheet when the battery cell is subjected to external force, avoids deformation of the connecting sheet, and prevents gaps or cracks from occurring at welding positions of the connecting sheet, the electrode post and the electrode lug, on the other hand, the integrated adhesive structure can enhance the integral structural strength of the battery cell cover plate assembly, improve the connection reliability of the connecting sheet and the cover plate assembly, further ensure the stability of current transmission of the battery cell, prolong the service life of the battery cell and improve the use safety of the battery cell. In an alternative embodiment, the cross-sectional area of the groove in the X-Y plane becomes progressively larger from the mouth of the groove to the bottom of the groove. The electric core has the advantages that on one hand, a sufficient and gradual accommodating space can be provided for injecting the connecting glue, the problems of overflowing and not filling of glue solution due to space limitation in the glue injection process are avoided, the continuous compact insulating glue layer is formed in the groove, the first glue injection hole and the second glue injection hole, on the other hand, an anchoring shape similar to an inverted table shape can be formed by the gradual change structure, the contact area between the insulating glue layer and the inner wall of the groove is increased, the bonding strength of the glue layer and the cover plate is enhanced by utilizing the mechanical engagement effect, the glue layer is prevented from being peeled off from the groove when being pulled by external force, meanwhile, the stress under the action of the external force is guided to be evenly dispersed along the side wall of the groove, the stable limiting effect of the insulating glue layer on the connecting sheet is further improved, the risk of deformation of the connecting sheet due to pulling is avoided, and the structural reliability and the service life of the electric core are ensured. In an alternative embodiment, the shape of the groove is in a truncated cone shape, an included angle between the wall of the groove and the central axis of the groove is A, and the value range of A is 10 DEG mm less than or equal to A less than or equal to 45 deg. The electric core cover plate assembly has the advantages that the circular truncated cone-shaped groove structure is matched with an included angle d