CN-122025724-A - Battery monomer, battery device and electric equipment

Abstract

The application discloses a battery monomer, a battery device and electric equipment. The battery cell includes a housing and an electrode assembly including at least one electrode unit including a plurality of electrode tab bodies and separators. The pole piece bodies comprise at least one first pole piece body, a second pole piece body and a third pole piece body, and the at least one first pole piece body is arranged between the second pole piece body and the third pole piece body. The first pole piece main body comprises a first current collecting main body, a first film layer and a second film layer, wherein the first current collecting main body comprises a first insulating base layer, a first conductive layer and a second conductive layer, the first conductive layer is electrically connected with the second conductive layer, the second pole piece main body comprises a second current collecting main body and a third film layer, the third pole piece main body comprises a third current collecting main body and a fourth film layer, the polarities of the first film layer and the second film layer are opposite, the polarities of the third film layer and the second film layer are the same, and the polarities of the fourth film layer and the first film layer are the same.

Inventors

• WU KAI
• LUO HONGSI
• WU YICHEN
• HUANG FAJUN
• Ye guangzhou
• YANG LEI
• CHEN JIAN

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (15)

1. 1. A battery cell, characterized by comprising a housing and an electrode assembly accommodated in the housing, the electrode assembly comprising at least one electrode unit, the electrode unit comprising a plurality of electrode sheet bodies stacked in a thickness direction of the electrode sheet bodies and a separator separating adjacent electrode sheet bodies; The pole piece bodies comprise at least one first pole piece body, a second pole piece body and a third pole piece body, and the at least one first pole piece body is arranged between the second pole piece body and the third pole piece body; The first pole piece main body comprises a first current collecting main body, a first film layer and a second film layer, the first current collecting main body comprises a first insulating base layer, a first conducting layer and a second conducting layer, the first conducting layer is arranged on one side of the first insulating base layer facing the second pole piece main body, the second conducting layer is arranged on one side of the first insulating base layer facing the third pole piece main body, the first film layer is arranged on one side of the first conducting layer facing away from the first insulating base layer, the second film layer is arranged on one side of the second conducting layer facing away from the first insulating base layer, and the first conducting layer is electrically connected with the second conducting layer; the second pole piece main body comprises a second current collecting main body and a third film layer, and the third film layer is arranged on one side of the second current collecting main body facing the first pole piece main body; the third pole piece main body comprises a third current collecting main body and a fourth film layer, and the fourth film layer is arranged on one side of the third current collecting main body facing the first pole piece main body; The polarities of the first film layer and the second film layer are opposite, the polarities of the third film layer and the second film layer are the same, and the polarities of the fourth film layer and the first film layer are the same.
2. 2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The second current collecting main body comprises a second insulating base layer and a third conductive layer, the third conductive layer is arranged on one side of the second insulating base layer facing the first pole piece main body, and the third film layer is arranged on one side of the third conductive layer facing away from the second insulating base layer; The third current collecting main body comprises a third insulating base layer and a fourth conductive layer, the fourth conductive layer is arranged on one side of the third insulating base layer facing the first pole piece main body, and the fourth film layer is arranged on one side of the fourth conductive layer facing away from the second insulating base layer.
3. 3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, The electrode unit comprises a plurality of bending parts, and two adjacent electrode plate main bodies are connected through the bending parts.
4. 4. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells, The first insulation base layer, the second insulation base layer, the third insulation base layer and the plurality of bending parts are integrally formed.
5. 5. The battery cell according to any one of claims 1 to 4, wherein, The electrode unit further comprises a first tab and a second tab, wherein the first tab is connected to the second current collecting body, and the second tab is connected to the third current collecting body.
6. 6. The battery cell of claim 5, wherein the battery cell comprises a plurality of cells, The first tab extends from an end of the second current collecting body along a first direction, and the second tab extends from an end of the third current collecting body along the first direction; The isolating piece is arranged on one side of the first film layer, which is opposite to the first conductive layer, the two ends of the first film layer along the second direction do not exceed the isolating piece, and the two ends of the isolating piece along the second direction exceed the second film layer; the first direction, the second direction and the thickness direction are perpendicular to each other.
7. 7. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells, The separator includes an electrolyte coating.
8. 8. The battery cell according to any one of claims 1 to 7, wherein, The electrode unit includes a conductive connection member through which the first conductive layer and the second conductive layer are electrically connected.
9. 9. The battery cell according to any one of claims 1 to 8, wherein, The electrode units are a plurality of, and the electrode units are stacked along the thickness direction.
10. 10. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells, The electrode unit further comprises a first tab and a second tab, wherein the first tab is connected with the second current collecting main body, and the second tab is connected with the third current collecting main body; the first tabs of the plurality of electrode units are laminated and connected in the thickness direction, and the second tabs of the plurality of electrode units are laminated and connected in the thickness direction.
11. 11. The battery cell according to claim 9 or 10, wherein, The electrode assembly comprises an insulating connecting layer, wherein the second current collecting body of one electrode unit and the third current collecting body of the other electrode unit are connected through the insulating connecting layer, and at least part of the insulating connecting layer is positioned between the two adjacent electrode units along the thickness direction.
12. 12. The battery cell of claim 11, wherein the battery cell comprises a plurality of cells, The second current collecting main body comprises a second insulating base layer and a third conductive layer, and the third conductive layer is arranged on one side of the second insulating base layer facing the first pole piece main body; The third current collecting main body comprises a third insulating base layer and a fourth conductive layer, and the fourth conductive layer is arranged on one side of the third insulating base layer facing the first pole piece main body; And in two adjacent electrode units, the second insulating base layer of one electrode unit, the third insulating base layer of the other electrode unit and the insulating connecting layer are of an integrated structure.
13. 13. The battery cell according to any one of claims 1-12, wherein, The electrode assembly includes an external insulating layer covering at least a portion of the at least one electrode unit from the outside.
14. 14. A battery device comprising a plurality of battery cells according to any one of claims 1-13.
15. 15. A powered device comprising a battery arrangement according to claim 14 for providing electrical energy.

Description

Battery monomer, battery device and electric equipment Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery device and electric equipment. Background With the continuous improvement of the living standard and environmental awareness of people, new energy industries are vigorously developed, and batteries are widely focused as an important ring in the new energy industries. Under the current situation that products containing batteries such as energy storage base stations, electric vehicles, unmanned aerial vehicles, mobile phones, electric tools and the like are very different, diversified and customized batteries need to be designed, and how to make the batteries compatible with multiple platforms becomes an industry problem. Disclosure of Invention The embodiment of the application provides a battery cell, a battery device and electric equipment, which can realize voltage regulation of a single battery cell, expand the capacity regulation range of the battery cell and improve compatibility. According to a first aspect of the present application, there is provided a battery cell including a case and an electrode assembly accommodated in the case, the electrode assembly including at least one electrode unit including a plurality of electrode tab bodies stacked in a thickness direction of the electrode tab bodies and a separator separating adjacent electrode tab bodies. The pole piece bodies comprise at least one first pole piece body, a second pole piece body and a third pole piece body, and the at least one first pole piece body is arranged between the second pole piece body and the third pole piece body. The first pole piece main body comprises a first current collecting main body, a first film layer and a second film layer, wherein the first current collecting main body comprises a first insulating base layer, a first conducting layer and a second conducting layer, the first conducting layer is arranged on one side of the first insulating base layer facing the second pole piece main body, the second conducting layer is arranged on one side of the first insulating base layer facing the third pole piece main body, the first film layer is arranged on one side of the first conducting layer, which is away from the first insulating base layer, the second film layer is arranged on one side of the second conducting layer, which is away from the first insulating base layer, and the first conducting layer is electrically connected with the second conducting layer. The second pole piece main body comprises a second current collecting main body and a third film layer, and the third film layer is arranged on one side of the second current collecting main body facing the first pole piece main body. The third pole piece main body comprises a third current collecting main body and a fourth film layer, and the fourth film layer is arranged on one side of the third current collecting main body facing the first pole piece main body. The polarities of the first film layer and the second film layer are opposite, the polarities of the third film layer and the second film layer are the same, and the polarities of the fourth film layer and the first film layer are the same. The battery cell provided by the embodiment of the application is provided with at least one electrode unit, and at least one first pole piece main body, a second pole piece main body and a third pole piece main body are arranged in the electrode unit to form a plurality of charging and discharging units. The first conductive layer of the first electrode tab body is electrically connected to the second conductive layer of the first electrode tab body, whereby a series connection of a plurality of charge and discharge cells can be achieved inside the electrode unit. The number of the first pole piece bodies is different, the voltage of the single electrode unit is also different, and the voltage adjustment of the single battery unit can be realized by reasonably selecting the number of the first pole piece bodies contained in the electrode unit. Meanwhile, the capacity of a single battery unit can be regulated by reasonably selecting the number of the electrode units, so that the dependence factors of capacity regulation are reduced, the capacity regulation range of the battery unit is enlarged, and the compatibility of the battery unit is improved. In some embodiments, the second current collecting body comprises a second insulating base layer and a third conductive layer, the third conductive layer is arranged on one side of the second insulating base layer facing the first pole piece body, the third film layer is arranged on one side of the third conductive layer facing away from the second insulating base layer, the third current collecting body comprises a third insulating base layer and a fourth conductive layer, the fourth conductive layer is arranged on one side of the th