CN-122000596-A - Battery cell

CN122000596ACN 122000596 ACN122000596 ACN 122000596ACN-122000596-A

Abstract

The invention relates to the technical field of batteries and discloses an electric core, which comprises a shell, a first pole group and a second pole group, wherein the first pole group and the second pole group are arranged in the shell, the first pole group and the second pole group are sequentially arranged along the Y direction, the first pole group comprises a plurality of first positive pole pieces and a plurality of first negative pole pieces which are stacked, the second pole group comprises a plurality of second positive pole pieces and a plurality of second negative pole pieces which are stacked, one end of the plurality of first positive pole pieces, which face the second pole group along the Y direction, jointly form a first positive pole end face, one end of the plurality of first negative pole pieces, which face the second pole group, jointly form a second positive pole end face, one end of the plurality of first negative pole pieces, which face the first negative pole end face, along the Y direction, jointly form a second negative pole end face, wherein the first positive pole end face and the second positive pole end face, and the first negative pole end face are electrically connected through conductive coatings.

Inventors

LIU YOUJIAN
MA YONGGUI
ZHOU JIE
LI ZHAOHUA

Assignees

蜂巢能源科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. A kind of electric core, characterized by comprising the following steps: A housing; The first pole group comprises a plurality of first positive pole pieces and a plurality of first negative pole pieces which are stacked along the Z direction, wherein one end of each first positive pole piece, which faces the second pole group along the Y direction, jointly forms a first positive pole end face, and one end of each first negative pole piece, which faces the second pole group along the Y direction, jointly forms a first negative pole end face; The second electrode group comprises a plurality of second positive electrode plates and a plurality of second negative electrode plates which are stacked along the Z direction, wherein the plurality of second positive electrode plates jointly form a second positive electrode end face towards one end of the first electrode group along the Y direction, and the plurality of first negative electrode plates jointly form a second negative electrode end face towards one end of the first electrode group along the Y direction; The first positive end face and the second positive end face and the first negative end face and the second negative end face are electrically connected through conductive coatings.
2. The cell of claim 1, wherein, in the Y direction, a first protrusion and a second protrusion are formed at an end of the first electrode group facing the second electrode group, an end surface of the first protrusion in the Y direction is the first positive electrode end surface, and an end surface of the second protrusion in the Y direction is the first negative electrode end surface; The first protruding portions and the second protruding portions are arranged at intervals along the X direction, the interval space forms a first clearance through groove, and the first clearance through groove penetrates through the first pole group along the Z direction.
3. The cell according to claim 2, wherein in the Y direction, a third protrusion and a fourth protrusion are formed at an end of the second electrode group facing the first electrode group, an end face of the third protrusion in the Y direction is the second positive electrode end face, and an end face of the fourth protrusion in the Y direction is the second negative electrode end face; The third protruding portion and the fourth protruding portion are arranged at intervals along the X direction, the interval space forms a second clearance through groove, the second clearance through groove penetrates through the second pole group along the Z direction, and the second clearance through groove and the first clearance through groove are oppositely arranged along the Y direction.
4. The cell of claim 1, wherein in the X-direction, first bosses are formed on both sides of the first pole group, second bosses are formed on both sides of the second pole group, the first bosses are spaced apart from the second bosses in the Y-direction, and a space between the first bosses and the second bosses on the same side in the X-direction forms a liquid storage space; wherein, along the Y direction, the distance between the first boss and the end face of the first pole group facing the second pole group and the distance between the second boss and the end face of the second pole group facing the first pole group are W1, Wherein W1 is more than or equal to 18mm and less than or equal to 60mm.
5. The cell according to claim 4, wherein an explosion-proof valve is provided on the housing, the explosion-proof valve being provided in correspondence with the liquid storage space in the X direction and the explosion-proof valve being in communication with the liquid storage space, and/or, Along the X direction, the distance between the first bosses on two sides of the first pole group is A, and the distance between the two side surfaces of the first pole group is F, so that the distance between the first bosses on two sides of the first pole group is more than or equal to 6mm and less than or equal to 12mm.
6. The cell of claim 5, wherein the electrode is electrically connected to the electrode, The shell comprises a shell body, wherein two opposite first shell walls of the shell body along the X direction are respectively provided with a third groove and a fourth groove for accommodating the first boss and the second boss, the bottoms of the third groove and the fourth groove along the X direction are outwards protruded relative to the shell body, and the explosion-proof valve is positioned between the third groove and the fourth groove.
7. The cell of claim 4, wherein in the Y direction, end faces of the first pole group and the second pole group facing away from each other are each provided with a fifth boss and a sixth boss, the fifth boss and the sixth boss are arranged at intervals in the X direction, the housing comprises a shell and cover plates located at two ends of the shell in the Y direction, and the cover plates comprise a fifth groove and a sixth groove for accommodating the fifth boss and the sixth boss, respectively; along the Z direction, the distance between two side surfaces of the fifth boss is K, the distance between two side surfaces of the first pole group is B2, and K/B2 is more than or equal to 0.35 and less than or equal to 0.7.
8. The battery cell according to claim 7, wherein in the Y direction, the end face of the first electrode group facing away from the second electrode group comprises a plane and inclined planes located on two sides of the plane in the X direction, one ends of the two inclined planes, which are far away from the plane, are configured to be far away from each other in the X direction, in the Y direction, the end face of the first electrode group facing away from the second electrode group is provided with a positive electrode tab connected with a positive electrode tab and a negative electrode tab connected with a negative electrode tab, in the Z direction, the positive electrode tab and the negative electrode tab are located on two sides of the fifth boss and the sixth boss respectively, and two ends of the positive electrode tab and/or the negative electrode tab in the X direction extend to the two inclined planes respectively.
9. The cell of claim 8, wherein the cell comprises a plurality of conductive traces, Along the X direction, the length of the plane is L3, the distance between the two sides, away from the fifth boss and the sixth boss, is L2, and the distance is more than or equal to 0mm and less than or equal to L3-L2 and less than or equal to 16mm; and/or the number of the groups of groups, The included angle of the two inclined planes is N, and N is more than or equal to 50 degrees and less than or equal to 110 degrees.
10. The cell of claim 1, wherein the cell comprises a plurality of conductive traces, The surface of the second pole group along the Z direction is provided with a fourth boss, and the end face of the fourth boss, which is away from the first pole group, is coplanar with the end face of the second pole group, which is away from the first pole group, along the Y direction; the shell comprises a shell body, wherein a first groove for accommodating the third boss and a second groove for accommodating the fourth boss are formed in two opposite second shell walls of the shell body along the Z direction; The outer surface of the second shell wall far away from the first pole group along the Z direction is provided with a first bulge corresponding to the first groove and a second bulge corresponding to the second groove, the third bulge and the fourth bulge are arranged at intervals along the Y direction, the first bulge and the second bulge are arranged at intervals and form an interval space, the shell comprises a cooling plate, the cooling plate is arranged in the interval space, and a medium channel is formed in the cooling plate; Along the Y direction, the third boss is apart from first utmost point group towards second utmost point group terminal surface interval is W2, the length along the Y direction of first utmost point group is E, satisfies: 250mm≤E≤600mm,0.15≤W2/E≤0.33; Along the X direction, the distance between two side surfaces of the third boss is L1, and the distance between two side surfaces of the first pole group is A, so that L1/A is more than or equal to 0.33 and less than or equal to 0.7; Along the Z direction, the interval of the third boss that is located the first utmost point group both sides is B1, the interval between the two surfaces of first utmost point group along the Z direction is B2, satisfies: 20mm≤B1-B2≤60mm。

Description

Battery cell Technical Field The invention relates to the technical field of batteries, in particular to an electric core. Background Along with the continuous maturity of lithium ion battery technology, lithium ion batteries have been widely used as power batteries in the fields of electric automobiles, energy storage and the like, and the requirements on the use performance and the safety of the lithium ion batteries are continuously improved. The lithium battery cell is used as the most critical safety unit and assembly core component in the battery pack, and the structural design of the lithium battery cell directly relates to the overall safety and reliability of the battery. Therefore, there is a higher demand for energy density and safety performance of the battery. Disclosure of Invention The invention provides a battery cell to solve the technical problems. The invention provides an electric core, which comprises a shell, a first pole group and a second pole group, wherein the first pole group and the second pole group are arranged in the shell and sequentially distributed along the Y direction, the first pole group comprises a plurality of first positive pole pieces and a plurality of first negative pole pieces which are stacked along the Z direction, one end of each first positive pole piece, which faces the second pole group along the Y direction, jointly forms a first positive pole end face, one end of each first negative pole piece, which faces the second pole group, jointly forms a first negative pole end face, the second pole group comprises a plurality of second positive pole pieces and a plurality of second negative pole pieces, which are stacked along the Z direction, jointly form a second positive pole end face, one end of each second positive pole piece, which faces the first pole group along the Y direction, jointly forms a second negative pole end face, and the first positive pole end face and the second negative pole end face are electrically connected through conductive coatings. The beneficial effects are that: Therefore, the first pole group and the second pole group are sequentially arranged along the length direction of the battery core, and the positive pole end face and the negative pole end face for electrically connecting with other pole groups are formed at the end part of each pole group. And finally, the electric connection is realized through the conductive coating, so that the space utilization rate of the electrode group in the shell is improved, and the capacity of the battery cell is further improved. Optionally, along the Y direction, one end of the first pole group facing the second pole group is provided with a first convex part and a second convex part, the end face of the first convex part along the Y direction is a first positive pole end face, the end face of the second convex part along the Y direction is a first negative pole end face, wherein the first convex part and the second convex part are arranged at intervals along the X direction, the interval space forms a first clearance through groove, and the first clearance through groove penetrates through the first pole group along the Z direction. The beneficial effects are that: Based on the method, a local interval region is formed between the first pole group and the second pole group, so that a liquid storage space is provided for electrolyte, the collection and the supplementation of the electrolyte in the end region of the pole group are facilitated, and the infiltration and infiltration conditions of the electrolyte into the pole group can be improved, so that the overall infiltration consistency of pole pieces is improved, the risk of polarization increase or performance attenuation caused by insufficient infiltration is reduced, and the electrochemical performance stability and the use reliability of the battery core are improved. Optionally, along the Y direction, one end of the second pole group facing the first pole group is provided with a third convex part and a fourth convex part, the end face of the third convex part along the Y direction is a second positive end face, the end face of the fourth convex part along the Y direction is a second negative end face, wherein the third convex part and the fourth convex part are arranged at intervals along the X direction, the interval space forms a second clearance through groove, the second clearance through groove penetrates through the second pole group along the Z direction, and the second clearance through groove and the first clearance through groove are oppositely arranged along the Y direction. The beneficial effects are that: In the present invention, the end surfaces of the first and third protrusions and the end surfaces of the second and fourth protrusions are electrically connected to each other by the conductive coating, respectively, so that a stable and reliable electrical connection relationship between the first and second electrode