CN-119481316-B - Battery assembly method and battery

CN119481316BCN 119481316 BCN119481316 BCN 119481316BCN-119481316-B

Abstract

The invention belongs to the technical field of batteries, and discloses a battery assembling method and a battery, wherein the method comprises the following steps of S1, installing a protective end plate on a first surface and/or a second surface of a pole group; the method comprises the steps of S2, coating insulating films on the outer sides of a plurality of side surfaces of a pole group, and carrying out hot melting on the insulating films and a protective end plate to form a pole group unit, S3, loading the pole group unit into a cavity of a composite shell, S4, arranging a composite cover plate at an opening of the composite shell, S5, welding the composite cover plate and the composite shell, S6, welding a composite pole and the composite cover plate and welding a composite pole and the composite shell, and S7, conducting current between the composite pole and the pole lug. And finally, the electrode lugs are connected with the composite electrode posts to realize current conduction, so that the influence of other welding procedures on the connection quality of the electrode lugs and the composite electrode posts is avoided, and the electrode lugs are extended out of the composite shell to realize current conduction, so that the occupation of the inner space of the composite shell is reduced, and the utilization rate of the space is improved.

Inventors

LI JINCHENG
WANG ZHIYU
ZHOU JIE

Assignees

蜂巢能源科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241113

Claims (10)

1. The battery assembling method is characterized in that the battery assembled by the battery assembling method comprises a composite shell, a pole group, a composite cover plate, a composite pole column and a protective end plate; the battery assembly method comprises the following steps: S1, the pole group comprises a first surface and a second surface which are provided with pole lugs, and a plurality of side surfaces perpendicular to the first surface and the second surface, a first penetrating structure is arranged on the protective end plate, and the first surface and/or the second surface of the pole group are/is arranged in the protective end plate, so that the pole lugs penetrate through the first penetrating structure; S2, coating insulating films on the outer sides of the pole groups, enabling the insulating films to be coated on the outer sides of the side surfaces, and carrying out hot melting on the insulating films and the protective end plates to form pole group units; S3, the composite shell is of a single-side open structure with a cavity, a wall surface opposite to the open side is provided with a second penetrating structure for extending the lug, a first insulating layer for isolating the composite shell and the lug is injection-molded on the wall surface, the pole assembly unit is installed in the cavity of the composite shell, and the lug penetrating through the first penetrating structure penetrates through the second penetrating structure; S4, a third penetrating structure used for extending the lug and a second insulating layer used for isolating the composite cover plate from the lug are formed on the composite cover plate, the composite cover plate is arranged at the opening of the composite shell, and the lug penetrating through the first penetrating structure penetrates through the third penetrating structure; s5, welding the composite cover plate and the composite shell; S6, a first accommodating groove is formed in one side, away from the pole group, of the composite shell, a second accommodating groove is formed in one side, away from the pole group, of the composite cover plate, the composite pole is arranged in the first accommodating groove and the second accommodating groove, and the composite pole, the composite cover plate and the composite pole and the composite shell are welded; and S7, conducting current between the composite pole and the pole lug.
2. The battery assembling method according to claim 1, characterized by further comprising, in step S2, the steps of: s21, the battery further comprises at least one protection side plate, and at least one protection side plate is pre-fused at a set position of the insulating film; s22, wrapping the insulating film on a plurality of side surfaces of the pole group, and enabling at least one protection side plate to cover one side surface of the pole group; s23, carrying out hot melting on an overlapped area between the insulating film and the protective end plate.
3. The battery assembling method according to claim 2, characterized by further comprising, in step S21, the steps of: s211, forming a positioning hole at a set position of the insulating film; S212, a positioning structure matched with the positioning hole is arranged on the protective side plate, and the protective side plate is arranged at the set position of the insulating film and is aligned with the positioning hole; S213, the protective side plate and the insulating film after assembly are subjected to hot melting.
4. The battery assembling method according to claim 2, characterized by further comprising, in step S23, the steps of: s231, arranging the composite cover plate on one side of the protective end plate, which is away from the pole group, for preassembling, and enabling the pole lug passing through the first penetrating structure to pass through the third penetrating structure; S232, measuring the distance L1 between the nearest point between the composite cover plate and the insulating film, judging whether L1 meets 0.5mm or less and L1 is or less than or equal to 3mm, if yes, executing the step S233, and if no, executing the step S234; s233, after the preassembled composite cover plate is removed, carrying out hot melting on an overlapped area between the insulating film and the protective end plate to form the pole group unit; S234, after the preassembled composite cover plate is removed, cutting the insulating film, and after cutting is completed, executing a step S231.
5. The battery assembling method according to claim 2, wherein a plurality of thermal melting points are provided at intervals in the overlapping region between the insulating film and the protective end plate, and a distance dimension between a boundary of a side of each of the thermal melting points facing away from the pole group and a boundary of the overlapping region facing away from the pole group is L2, and satisfies 0.5mm ∈l2 ∈3mm; And/or, the distance dimension between the boundary of each thermal melting point towards the side of the pole group and the boundary of the overlapping region towards the side of the pole group is L3, and the dimension is more than or equal to 0.5mm and less than or equal to L3 and less than or equal to 3mm.
6. The battery assembling method according to claim 1, characterized by further comprising, in step S5, the steps of: s51, pre-welding positioning is carried out on the composite cover plate and the composite shell through a plurality of first pre-welding points which are arranged at intervals; s52, fully welding the composite cover plate and the composite shell.
7. The battery assembly method of claim 1, wherein the composite housing comprises a housing body and the first insulating layer; The shell body comprises a first wall surface and a plurality of second wall surfaces perpendicular to the first wall surface, the second wall surfaces are annularly arranged on the periphery side of the first wall surface and used for forming a hollow shell structure with an opening at one side, the first accommodating groove is formed in one side, away from the pole group, of the first wall surface, and a first inserting through hole formed in the first accommodating groove is further formed in the first wall surface; The first insulating layer is formed on the first wall surface in an injection mode and comprises a first upper insulating part, a first lower insulating part and a first inserting part, the first upper insulating part is arranged on one side, deviating from the pole group, of the first wall surface and is positioned in the first accommodating groove, the first lower insulating part is arranged on one side, facing the pole group, of the first wall surface, the first inserting part is inserted in the first inserting through hole and is used for connecting the first upper insulating part with the first lower insulating part, and the second penetrating structure penetrates through the first upper insulating part, the first inserting part and the first lower insulating part.
8. The battery assembly method of claim 7, wherein the composite cover plate comprises a cover plate body and the second insulating layer; The second accommodating groove is formed in the cover plate body, and a second inserting through hole is formed in the cover plate body and is formed in the second accommodating groove; The second insulating layer injection moulding in on the apron body, and include second upper insulator, second lower insulator and second grafting portion, second upper insulator is located the apron body deviates from one side of utmost point group, and is located in the second holding tank, second lower insulator is located the apron body orientation one side of utmost point group, second grafting portion is inserted and is located in the second grafting through-hole is used for connecting second upper insulator with second lower insulator, third throughout structure runs through second upper insulator second grafting portion with second lower insulator.
9. The battery assembling method according to claim 8, characterized by further comprising, in step S6, the steps of: S61, a first mounting groove is formed in one side, away from the shell body, of the first upper insulating part, a second mounting groove is formed in one side, away from the cover plate body, of the second upper insulating part, and the battery further comprises a connecting sheet which is arranged in the first mounting groove and the second mounting groove; S62, bending parts of the electrode lugs extending out of the second penetrating structure and the third penetrating structure, and welding the bent electrode lugs with the connecting sheet; s63, the battery further comprises sealing rings, and the sealing rings are arranged in the first accommodating groove and the second accommodating groove; s64, loading the composite pole into the first accommodating groove and the second accommodating groove; s65, welding the composite pole and the composite cover plate, and welding the composite pole and the composite shell.
10. A battery, characterized in that the battery is assembled by the battery assembling method according to any one of claims 1 to 9.

Description

Battery assembly method and battery Technical Field The invention relates to the technical field of batteries, in particular to a battery assembly method and a battery. Background The conventional assembly process of the blade battery is generally to assemble the pole into the battery shell, then weld the pole post with the pole lug with the corresponding polarity, then sequentially fill the lower plastic and the cover plate, make a part of the pole post pass through the lower plastic and the cover plate and extend out of the battery shell, after the cover plate is assembled, weld the cover plate with the battery shell, then sequentially fill the plastic, the sealing ring and the welding table on the outer side of the cover plate corresponding to the extending part of the pole post, and finish welding the welding table with the cover plate, and weld the welding table with the pole post extending out of the cover plate, thereby finishing the assembly of the blade battery. However, in the blade battery assembled by the method, on one hand, welding of the electrode lug and the electrode post is required to be completed, and then welding of the cover plate and the battery shell, welding of the welding table and the cover plate and welding of the welding table and the electrode post are completed, so that the welded electrode lug and the electrode post are influenced by bad factors such as high temperature and vibration when the cover plate and the battery shell are welded, the welding table and the cover plate are welded and the welding table and the electrode post are welded, the welding quality between the electrode post and the electrode lug is reduced, the yield of products is reduced, and on the other hand, the method also needs to ensure that the electrode post and the electrode lug are connected in the battery shell, so that the electrode lug and the electrode post occupy a larger space in the battery shell, the volume of the electrode group is limited, the energy density is lower, and a large number of welding operations are caused on the electrode lug side due to the welding of the cover plate and the welding table and the electrode post, so that the microstructure of the electrode lug material is influenced by bad change due to the high temperature generated by the large welding operation, so that the self-performance and the cycle performance of the blade battery are reduced, and the cycle performance of the blade is also influenced. Disclosure of Invention The invention aims to provide a battery assembly method and a battery, which have higher product yield and energy density. To achieve the purpose, the invention adopts the following technical scheme: in one aspect, a battery assembly method is provided, a battery assembled with the battery assembly method comprising a composite housing, a pole set, a composite cover plate, a composite pole post, and a protective end plate; the battery assembly method comprises the following steps: S1, the pole group comprises a first surface and a second surface which are provided with pole lugs, and a plurality of side surfaces perpendicular to the first surface and the second surface, a first penetrating structure is arranged on the protective end plate, and the first surface and/or the second surface of the pole group are/is arranged in the protective end plate, so that the pole lugs penetrate through the first penetrating structure; S2, coating insulating films on the outer sides of the pole groups, enabling the insulating films to be coated on the outer sides of the side surfaces, and carrying out hot melting on the insulating films and the protective end plates to form pole group units; S3, the composite shell is of a single-side open structure with a cavity, a wall surface opposite to the open side is provided with a second penetrating structure for extending the lug, a first insulating layer for isolating the composite shell and the lug is injection-molded on the wall surface, the pole assembly unit is installed in the cavity of the composite shell, and the lug penetrating through the first penetrating structure penetrates through the second penetrating structure; S4, a third penetrating structure used for extending the lug and a second insulating layer used for isolating the composite cover plate from the lug are formed on the composite cover plate, the composite cover plate is arranged at the opening of the composite shell, and the lug penetrating through the first penetrating structure penetrates through the third penetrating structure; s5, welding the composite cover plate and the composite shell; S6, a first accommodating groove is formed in one side, away from the pole group, of the composite shell, a second accommodating groove is formed in one side, away from the pole group, of the composite cover plate, the composite pole is arranged in the first accommodating groove and the second accommodating groove, and the composite pole, the composite cover