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CN-122025937-A - Battery cell

CN122025937ACN 122025937 ACN122025937 ACN 122025937ACN-122025937-A

Abstract

The invention relates to the technical field of batteries and provides a battery core, which comprises a battery core shell, a battery core cover plate and a pole group, wherein the battery core cover plate is provided with an opening, the cover plate body is arranged in the opening and is surrounded with the battery core shell to form a containing cavity, a first supporting table, a mounting table and a second supporting table are arranged on the outer side face of the cover plate body, the mounting table is positioned between the first supporting table and the second supporting table, the pole group penetrates through the cover plate body and protrudes out of the mounting table, a first sinking groove, a third sinking groove and a second sinking groove are respectively formed in the inner side face of the battery core cover plate, corresponding to the first supporting table, the mounting table and the second supporting table, the pole group is arranged in the containing cavity, the pole lug is connected to the connecting end face of the pole group and is connected with the pole group, a first convex hull and a second convex hull which are arranged along the length direction are arranged on the connecting end face, the first convex hull is contained in the first sinking groove, the second convex hull is contained in the third sinking groove, and the pole lug is contained in the second sinking groove. The battery cell can improve the energy density of the battery pack and increase the capacity of the battery cell.

Inventors

  • XIN XUEQIAN

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. A kind of electric core, characterized by comprising the following steps: The battery cell shell is provided with an opening; The battery cell cover plate comprises a cover plate body and a pole, wherein the cover plate body is arranged in the opening and surrounds the battery cell shell to form a containing cavity, a first supporting table, a mounting table and a second supporting table which are arranged along the length direction of the cover plate body are convexly arranged on one side of the cover plate body, which is far away from the containing cavity, the mounting table is positioned between the first supporting table and the second supporting table, the pole penetrates through the cover plate body and protrudes out of the mounting table, and a first sink groove, a third sink groove and a second sink groove are respectively formed at the positions, corresponding to the first supporting table, the mounting table and the second supporting table, of one side of the battery cell cover plate, which faces the containing cavity; The pole group is arranged in the accommodating cavity and is provided with a connecting end face and a pole lug, the pole lug is connected to the connecting end face and is connected with the pole post, a first convex hull and a second convex hull which are distributed along the length direction are arranged on the connecting end face, the first convex hull is accommodated in the first sinking groove, the second convex hull is accommodated in the third sinking groove, and the pole lug is accommodated in the second sinking groove.
  2. 2. The battery cell according to claim 1, wherein the number of the mounting tables and the second supporting tables is two, the first supporting table is located between the two second supporting tables, the two mounting tables are respectively arranged on two sides of the first supporting table, each mounting table is provided with the pole in a penetrating mode, the number of the second convex hulls is two, and the two second convex hulls are respectively arranged on two sides of the first convex hulls.
  3. 3. The battery cell according to claim 1, wherein the cover plate body has a reference surface, the first support table, the mounting table and the second support table are convexly arranged on the reference surface, and the protruding height of the first support table and the second support table relative to the reference surface is larger than the protruding height of one end of the pole protruding from the mounting table relative to the reference surface.
  4. 4. A cell according to any one of claims 1 to 3, wherein the first support table, the mounting table and the second support table are connected to form an integral boss, the first sink, the third sink and the second sink are connected to form an integral sink, the first convex hull and the second convex hull are connected to form a stepped convex hull, the height of the first convex hull is greater than the height of the second convex hull, and the first convex hull is in limited fit with the first sink.
  5. 5. The battery cell according to claim 4, wherein the battery cell cover plate further comprises an insulating member, the insulating member is disposed on one side of the cover plate body close to the pole group, the pole is arranged on the insulating member in a penetrating manner, a groove is formed at a position, corresponding to the integrated boss, of one side of the cover plate body close to the pole group, the insulating member is in concave-convex fit with the groove, and the integral sink is formed at a position, corresponding to the groove, of one side of the insulating member away from the cover plate body.
  6. 6. The cell of claim 4, wherein the pole group comprises two pole group units, the pole group units have a first end face and a pole ear, the pole ear is connected to the first end face, the first end face is convexly provided with a convex part, each pole group unit has an inner side face and an outer side face which are opposite to each other in the width direction of the cover plate body, the convex part is flush with the inner side face, a space exists between the convex part and the outer side face in the width direction, the inner side faces of the two pole group units are jointed, and the two convex parts opposite to each other in the width direction are jointed to form the stepped convex hull.
  7. 7. The cell of claim 6, wherein a spacing between the convex portion and the outer side in the width direction is b, and b is 7mm or less and 15mm or less.
  8. 8. The cell of claim 4, wherein the cover plate body has a reference surface, the integral boss is convexly arranged on the reference surface, an included angle between a side wall of the integral boss and the reference surface is 90 ° +β, an included angle between a side surface of the first convex hull and the connecting end surface is 90 ° +θ,15 ° - β -25 °,15 ° - θ -3 °; And/or, the assembly gap between the top surface of the stepped convex hull and the integral sinking groove is c, c is more than or equal to 0.3mm and less than or equal to 0.8mm, and the assembly gap between the side surface of the first convex hull and the first sinking groove is d, wherein d is more than or equal to 1.5mm and less than or equal to 2.5mm; and/or the spacing between the two ends of the stepped convex hull in the length direction and the edge of the pole group is G1, and G1 is more than or equal to 35mm and less than or equal to 50mm.
  9. 9. The cell of claim 1, wherein the tab has a root section and a folded section, the root section is connected to the connection end face, the folded section is connected to an end of the root section away from the connection end face, a position where the root section and the folded section are connected is a folded position of the tab, and a distance between an outer side face of one side of the tab group in a width direction of the cover plate body and the folded position is a, and a is 1mm or less and 3mm or less.
  10. 10. The cell of claim 1, wherein in a thickness direction of the cover plate body, a height of the first convex hull relative to the connection end face is H1, and a height of the second convex hull relative to the connection end face is H2, and H1-H2 is 3.5mm or less and 5mm or less.

Description

Battery cell Technical Field The invention relates to the technical field of batteries, in particular to a battery cell. Background The battery pack comprises a box body and a battery module assembled in the box body, wherein the battery module consists of a plurality of electric cores, electric connection is realized between the poles of the electric cores through a bus bar, the box body provides physical support for the battery module, the battery module is protected from damage such as external collision and extrusion, and meanwhile, the battery module can prevent invasion of impurities such as moisture and dust. As the demand of users for battery endurance increases, current battery technologies face the contradiction that battery capacity increases lag market demand, resulting in user endurance anxiety. In the traditional battery pack structure, in order to avoid the case body to cause the extrusion to busbar and utmost point post when taking place to warp under the external impact effect, can leave great space between the box of busbar and battery pack, but this needs to reduce the volume of electric core, leads to the energy density of battery pack low and electric core capacity is lower. Disclosure of Invention The invention provides a battery cell which is used for solving the problems of low energy density and low capacity of the battery cell of the prior art. The invention provides a battery cell, comprising: The battery cell shell is provided with an opening; The battery cell cover plate comprises a cover plate body and a pole, wherein the cover plate body is arranged in the opening and surrounds the battery cell shell to form a containing cavity, a first supporting table, a mounting table and a second supporting table which are sequentially arranged along the length direction of the cover plate body are arranged on one side of the cover plate body away from the containing cavity, the pole penetrates through the cover plate body and protrudes out of the mounting table, and a first sink groove, a third sink groove and a second sink groove are respectively formed at positions, corresponding to the first supporting table, the mounting table and the second supporting table, of one side of the battery cell cover plate facing the containing cavity; The pole group is arranged in the accommodating cavity and is provided with a connecting end face and a pole lug, the pole lug is connected to the connecting end face and is connected with the pole post, a first convex hull and a second convex hull which are distributed along the length direction are arranged on the connecting end face, the first convex hull is accommodated in the first sinking groove, the second convex hull is accommodated in the third sinking groove, and the pole lug is accommodated in the second sinking groove. According to the battery cell provided by the invention, the number of the mounting tables and the number of the second supporting tables are two, the first supporting tables are positioned between the two second supporting tables, the two mounting tables are respectively arranged on two sides of the first supporting tables, each mounting table is provided with the pole in a penetrating way, the number of the second convex hulls is two, and the two second convex hulls are respectively arranged on two sides of the first convex hull. According to the battery cell provided by the invention, the cover plate body is provided with the datum plane, the first supporting table, the mounting table and the second supporting table are convexly arranged on the datum plane, and the convexly arranged height of the first supporting table and the second supporting table relative to the datum plane is larger than the convexly arranged height of one end of the pole, which is convexly arranged on the mounting table, relative to the datum plane. According to the battery cell provided by the invention, the first supporting table, the mounting table and the second supporting table are connected to form an integrated boss, the first sinking groove, the third sinking groove and the second sinking groove are connected to form an integrated sinking groove, the first convex hull and the second convex hull are connected to form a stepped convex hull, the protruding height of the first convex hull is larger than that of the second convex hull, and the first convex hull is in limit fit with the first sinking groove. According to the battery cell provided by the invention, the battery cell cover plate further comprises an insulating part, the insulating part is arranged on one side, close to the pole group, of the cover plate body, the pole is arranged on the insulating part in a penetrating mode, a groove is formed in the position, corresponding to the integrated boss, of one side, facing the accommodating cavity, of the cover plate body, the insulating part is in concave-convex fit with the groove, and the integral sink is formed in the position, corresponding