CN-121507293-B - Battery device and electricity utilization device

Abstract

The application belongs to the technical field of batteries, and particularly relates to a battery device and an electric device, wherein the battery device comprises a box body and a battery unit group arranged in an accommodating space of the box body, a connecting part fixed in the box body is also arranged in the accommodating space, the battery unit group comprises a plurality of bag-type battery units, each bag-type battery unit comprises a packaging bag and an electrode leading-out part, the electrode leading-out part is arranged on a first side wall of the packaging bag, the packaging bag is further provided with a second side wall connected with the first side wall, the connecting part faces the second side wall of the packaging bag, a limiting part is arranged opposite to the connecting part in an extending manner, part or all of the limiting part is inserted into the connecting part, the limiting part can be in plug-in fit with the connecting part and limit, so that the bag-type battery unit can be fixedly connected with the box body more reliably, the shaking risk of the battery unit group is reduced, the mounting firmness and the stability of the battery unit group in the box body are improved, and the integral strength and the shock resistance of the battery device are improved.

Inventors

• WANG ZHI
• Wu Guangdang
• HUANG HAIYANG
• SHI WEIGANG
• HUANG FUYONG

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20260113

Claims (20)

1. 1. A battery device, characterized by comprising: a case having an accommodation space; the battery cell group comprises a plurality of bag-type battery cells, the bag-type battery cells comprise a packaging bag and electrode lead-out parts led out from the packaging bag, the packaging bag comprises a circumferential side wall and two main walls which are oppositely arranged, the circumferential side wall surrounds the main walls and is connected with the two main walls from the circumferential edge of the main walls, the circumferential side wall comprises a first side wall and a second side wall connected with the first side wall, and the electrode lead-out parts are arranged on the first side wall; The accommodating space is internally provided with a connecting part fixed to the box body, at least part of the second side wall is arranged opposite to the connecting part, the second side wall is provided with a limiting part in an extending mode relative to the connecting part, and at least part of the limiting part is inserted into the connecting part.
2. 2. The battery device according to claim 1, wherein an end portion of the stopper portion remote from the package bag is buried in the connecting portion.
3. 3. The battery device of claim 1, wherein the second side wall includes two first edge sealing portions disposed at opposite intervals along a first direction, the first side wall is connected between the two first edge sealing portions, and at least one of the two first edge sealing portions is provided with the limiting portion.
4. 4. The battery device according to claim 3, wherein the limiting portions are provided in both of the first edge sealing portions.
5. 5. The battery device of claim 3, wherein the second side wall further comprises a second edge sealing portion, the second edge sealing portion is connected between the two first edge sealing portions and is arranged at an interval relative to the first side wall along a second direction, the second edge sealing portion is provided with the limiting portion, and the second direction is perpendicular to the first direction.
6. 6. The battery device according to claim 5, wherein the limiting portion provided at the first edge sealing portion is a bar portion extending in the second direction, and opposite ends of the limiting portion are connected to the first side wall and the second edge sealing portion, respectively; And/or the limiting part arranged on the second edge sealing part is a strip-shaped part extending along the first direction, and two opposite ends of the limiting part are respectively connected with the two first edge sealing parts.
7. 7. The battery device of claim 5, wherein the connecting portion includes a plurality of first sub-portions spaced apart along the first direction, the battery cell stack is disposed between two adjacent first sub-portions, and the limiting portion disposed at the first edge sealing portion is inserted into the corresponding first sub-portion.
8. 8. The battery device according to claim 7, wherein the battery device comprises a plurality of groups of the battery cell groups sequentially arranged along the first direction, the first sub-parts are arranged in gaps between two adjacent groups of the battery cell groups along the first direction, and the limiting parts arranged on two adjacent first edge sealing parts of two adjacent bag-shaped battery cells along the first direction are inserted into the same first sub-part.
9. 9. The battery device according to claim 7, wherein the connecting portion further includes a second sub-portion provided on a side portion of the second edge sealing portion in the second direction, the second sub-portion being connected to the first sub-portion, and the stopper portion provided on the second edge sealing portion being inserted into the second sub-portion.
10. 10. The battery device according to claim 9, wherein the battery device comprises two groups of the battery cell groups arranged at intervals along a second direction, the connecting part comprises one second sub-part, the second sub-part is arranged between the two groups of the battery cell groups, and the second edge sealing parts of the packaging bags of the bag-type battery cells of the two groups of the battery cell groups are arranged oppositely.
11. 11. The battery device of claim 9, wherein the second sub-portion and the first sub-portion are integrally formed.
12. 12. The battery device according to claim 1, wherein the portion of the stopper portion inserted into the connecting portion is provided with a cavity, and the portion of the connecting portion is embedded in the cavity.
13. 13. The battery device of claim 12, wherein the cavity includes a through hole provided in the limiting portion, and a portion of the connecting portion is disposed through the through hole.
14. 14. The battery device according to claim 12, wherein the portion of the stopper portion inserted into the connecting portion is provided with a concave-convex folded structure, and the cavity includes a concave portion of the folded structure.
15. 15. The battery device according to claim 14, wherein the package pouch further comprises two main walls connected between the first side wall and the second side wall, a plurality of pouch-type battery cells of the same group of battery cells are stacked in order, the main walls of two pouch-type battery cells adjacent in the layout direction are disposed opposite to each other, and the folded structure is disposed protruding in a direction intersecting the main walls.
16. 16. The battery device of claim 14, wherein the hem structure has a wavy or zigzag profile.
17. 17. The battery device of claim 14, wherein the cavity further comprises a through hole, the through hole is formed in the flange structure, and/or the through hole is formed in the limit portion at a position between the flange structure and the second side wall.
18. 18. The battery device according to any one of claims 1 to 17, wherein the connection portion is a concrete structure portion.
19. 19. The battery device according to claim 18, wherein at least a surface of the connecting portion opposite to the second side wall is provided with a first insulating layer.
20. 20. The battery device according to claim 18, wherein at least a portion of the stopper portion inserted into the connecting portion is an insulating portion, or a surface of at least a portion of the stopper portion inserted into the connecting portion is provided with a second insulating layer.

Description

Battery device and electricity utilization device Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery device and an electricity utilization device. Background With the rise of new energy devices typified by new energy automobiles, a battery device has become a key power source. In the related art, the battery device generally includes a box and a plurality of battery monomers disposed in the box, for example, including a plurality of square shell battery monomers or bag type battery monomers, the battery monomers are stacked according to a certain order to form a battery monomer group, the battery monomer group is then integrally installed in the box, in order to reduce the shaking risk of the battery monomer group in the box, gaps between adjacent battery monomer groups and gaps between the battery monomer groups and the walls of the box are filled with connecting materials such as structural adhesive, so as to connect adjacent battery monomer groups and the box. However, the outer surface of the current battery monomer is smooth, the connection reliability between the current battery monomer and the filled structure is not high, and the connection interface between the outer surface of the battery monomer and the filled structure is easy to separate, so that the battery monomer group and the filled structure are separated, the filled structure is difficult to exert an effective connection effect, the battery monomer group is loosely connected, and the overall performance of the battery device is difficult to improve. The statements made above merely serve to provide background information related to the present disclosure and may not necessarily constitute prior art. Disclosure of Invention The embodiment of the application aims to provide a battery device and an electricity utilization device so as to improve the installation stability and firmness of battery cells of the battery device in a box body. The technical scheme adopted by the embodiment of the application is as follows: in a first aspect, there is provided a battery device comprising: a case having an accommodation space; The battery unit group comprises a plurality of bag-type battery units, each bag-type battery unit comprises a packaging bag and an electrode lead-out part led out from the packaging bag, each packaging bag comprises a first side wall and a second side wall connected with the first side wall, and the electrode lead-out part is arranged on the first side wall; Wherein, still be equipped with the connecting portion that is fixed in the box in the accommodation space, the second lateral wall at least part sets up with connecting portion relatively, and the relative connecting portion of second lateral wall extends and is provided with spacing portion, and in the connecting portion was inserted to at least part of spacing portion. The battery device comprises a box body and at least one group of battery unit groups, wherein the battery unit groups are arranged in an accommodating space of the box body, a connecting part fixed to the box body is further arranged in the accommodating space, the battery unit groups comprise a plurality of bag-type battery units, each bag-type battery unit comprises a packaging bag and an electrode leading-out part led out from the side part of each packaging bag, the electrode leading-out part is arranged on a first side wall of each packaging bag, each packaging bag is further provided with a second side wall connected to the corresponding first side wall, the connecting part faces to the corresponding second side wall of each packaging bag, a limiting part is arranged in an extending mode relative to the corresponding connecting part, and part or all of each limiting part is inserted into the corresponding connecting part. In some embodiments, the end of the stop portion remote from the envelope is embedded within the connecting portion. Through adopting the technical scheme of this embodiment, the inside of connecting portion adjacent with it is buried in the tip of spacing portion, and the setting of spacing portion can not additionally occupy the inner space of box to can reduce the risk that leads to battery device's energy density to reduce because of setting up spacing portion. In some embodiments, the second side wall includes two first edge sealing portions disposed at opposite intervals along the first direction, the first side wall is connected between the two first edge sealing portions, and at least one of the two first edge sealing portions is provided with a limiting portion. Through adopting the technical scheme of this embodiment, set up spacing portion at the side of the heat-seal banding of encapsulation bag, spacing portion can integrated into one piece in the side position of plastic-aluminum membrane before the preparation encapsulation bag, when banding, with spacing portion as outside extending the structure keep