CN-121216015-B - Battery device and electricity utilization device

Abstract

The application provides a battery device and an electricity utilization device. The battery device comprises a box body and a battery unit, the box body is provided with a containing cavity, the box body comprises a bottom plate and a bottom guard plate, the bottom plate is arranged on one side of the containing cavity along the first direction, and the bottom guard plate is arranged on one side of the bottom plate back to the containing cavity. The battery monomer sets up in holding the chamber and connects in the bottom plate, and the battery monomer is provided with pressure release mechanism, and pressure release mechanism is towards the bottom plate. The bottom guard plate comprises a first part and a second part, the first part and the second part are arranged and connected along the direction intersecting with the first direction, the rigidity of the first part is larger than that of the second part, the first part comprises a plate main body and a reinforcing piece, the reinforcing piece and the plate main body are arranged and connected along the first direction, and in the same plane vertical to the first direction, the orthographic projection of the reinforcing piece and the orthographic projection of the pressure relief mechanism are at least partially overlapped. The application can achieve both reliability and cost of the battery device.

Inventors

• WU GUOWEI

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20251121

Claims (20)

1. 1. A battery device, characterized by comprising: The box body is provided with a containing cavity and comprises a bottom plate and a bottom guard plate, wherein the bottom plate is arranged on one side of the containing cavity along a first direction, and the bottom guard plate is arranged on one side of the bottom plate, which is opposite to the containing cavity; the battery unit is arranged in the accommodating cavity and connected with the bottom plate, and is provided with a pressure release mechanism which faces the bottom plate; The bottom guard plate comprises a first part and a second part, the first part and the second part are arranged and connected along the direction intersecting with the first direction, the rigidity of the first part is larger than that of the second part, the first part comprises a plate main body and a reinforcing piece, the reinforcing piece and the plate main body are arranged and connected along the first direction, in the same plane vertical to the first direction, the orthographic projection of the reinforcing piece and the orthographic projection of the pressure relief mechanism are at least partially overlapped, and the first part and the bottom plate are arranged at intervals along the first direction.
2. 2. The battery device of claim 1, wherein a dimension of the first portion along the first direction is greater than a dimension of the second portion along the first direction.
3. 3. The battery device according to claim 1, wherein the reinforcement is attached to a side of the plate body facing the bottom plate.
4. 4. The battery device of claim 1, wherein the second portion is of unitary construction with the plate body.
5. 5. The battery device according to claim 1, wherein the reinforcement member includes a first reinforcement portion and a second reinforcement portion, the second reinforcement portion being connected between the first reinforcement portion and the plate main body, the second reinforcement portion having an elastic modulus smaller than that of the first reinforcement portion.
6. 6. The battery device according to claim 5, wherein the second reinforcing portion includes a glue layer, and the first reinforcing portion is adhesively connected to the plate main body through the glue layer.
7. 7. The battery device according to claim 6, wherein the first reinforcing portion is welded to the plate main body and forms a welded portion, the welded portion being disposed with the adhesive layer in a direction intersecting the first direction.
8. 8. The battery device of claim 7, wherein the weld is disposed around the glue layer.
9. 9. The battery device according to claim 1, wherein the number of the battery cells is plural, and the number of the first portions is plural; at least one first part is arranged corresponding to the pressure release mechanisms of the battery cells, or the first parts are arranged corresponding to the pressure release mechanisms of the battery cells one by one.
10. 10. The battery device of claim 1, wherein a cavity is provided between the bottom plate and the bottom plate.
11. 11. The battery device according to claim 1, wherein the bottom plate includes a third portion and a fourth portion, the third portion and the fourth portion being disposed and connected in a direction intersecting the first direction, the third portion having a stiffness less than a stiffness of the fourth portion, the third portion being disposed adjacent to the pressure release mechanism; The orthographic projection of the first portion at least partially overlaps the orthographic projection of the third portion in the same plane perpendicular to the first direction.
12. 12. The battery device of claim 11, wherein the base plate comprises a first plate body and a second plate body, the first plate body and the second plate body being welded and forming a first weld, the third portion comprising the first weld.
13. 13. The battery device of claim 12, wherein the first weld extends in a second direction, the pressure relief mechanisms are disposed on both sides of the first weld in a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.
14. 14. The battery device of claim 12, wherein at least one of two sides of the bottom plate opposite in the first direction is provided with a recess, at least a portion of the first weld being received in the recess.
15. 15. The battery device of claim 1, wherein a cavity is provided within the base plate, and wherein an orthographic projection of the cavity at least partially overlaps an orthographic projection of the pressure relief mechanism in a same plane perpendicular to the first direction.
16. 16. The battery device of claim 15, wherein the housing further comprises a stiffener disposed within the cavity and connected between two side surfaces of the bottom plate facing the cavity in the first direction.
17. 17. The battery device of claim 16, wherein the stiffener includes a first end connected to one of the two side surfaces of the base plate facing the cavity in the first direction and a second end connected to the other of the two side surfaces of the base plate facing the cavity in the first direction; The orthographic projection of the first end and the orthographic projection of the second end are arranged at intervals in the same plane perpendicular to the first direction.
18. 18. The battery device of claim 15, wherein the housing further comprises a buffer disposed within the cavity, the buffer having a modulus of elasticity that is less than a modulus of elasticity of the base plate.
19. 19. The battery device of any one of claims 1-18, wherein an area S1 of the orthographic projection of the first portion and an area S2 of the orthographic projection of the bottom plate satisfy a relationship of 0.002+.s1/s2+.0.05 in the same plane perpendicular to the first direction.
20. 20. An electrical device comprising a battery device according to any one of claims 1 to 19 for storing or providing electrical energy.

Description

Battery device and electricity utilization device Technical Field The present application relates to the field of battery technologies, and in particular, to a battery device and an electric device. Background With the development of new energy technology, the battery is increasingly widely applied, for example, to mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like. In the development of battery technology, how to consider the reliability and cost of a battery device is a continuous research direction in battery technology. Disclosure of Invention In view of the above, the present application provides a battery device and an electric device, which can achieve both reliability and cost of the battery device. In a first aspect, an embodiment of the present application provides a battery device, where the battery device includes a case and a battery unit, the case has a housing cavity, the case includes a bottom plate and a bottom protection plate, the bottom plate is disposed on a side of the housing cavity along a first direction, and the bottom protection plate is disposed on a side of the bottom plate opposite to the housing cavity. The battery monomer sets up in holding the chamber and connects in the bottom plate, and the battery monomer is provided with pressure release mechanism, and pressure release mechanism is towards the bottom plate. The bottom guard plate comprises a first part and a second part, the first part and the second part are arranged and connected along the direction intersecting with the first direction, the rigidity of the first part is larger than that of the second part, the first part comprises a plate main body and a reinforcing piece, the reinforcing piece and the plate main body are arranged and connected along the first direction, and in the same plane vertical to the first direction, the orthographic projection of the reinforcing piece and the orthographic projection of the pressure relief mechanism are at least partially overlapped. Through carrying out the subregion design to the backplate at the bottom, set up the higher first part of rigidity to relief mechanism corresponds the region, and adopt the second part of lower rigidity relatively in other regions, when battery device suffered external impact, first part can form key protection to relief mechanism, effectively reduces the risk of relief mechanism damage or inefficacy. Meanwhile, the local area of the bottom guard plate is reinforced, so that the problem of cost rise caused by the reinforced design of the whole bottom guard plate is avoided, and the reliability and the cost of the battery device can be considered. In addition, through the mode that adopts add the reinforcement spare on the board main part in order to improve the rigidity of first part, not only possess lower preparation degree of difficulty, can also set up the reinforcement spare in a flexible way according to different demands to improve the holistic design flexibility of backplate. In some embodiments of the first aspect, the first portion has a dimension in the first direction that is greater than a dimension of the second portion in the first direction. By differently designing the structural dimensions of the first portion and the second portion, the rigidity of the first portion is improved in a manner of increasing the thickness of the first portion, so that the processing complexity can be reduced, and the cost can be reduced. In some embodiments of the first aspect, the reinforcement is attached to a side of the plate body facing the bottom plate. The uniformity of the appearance of the bottom guard plate can be improved, thereby improving the appearance quality of the battery device. In some embodiments of the first aspect, the second portion is of unitary construction with the plate body. On the one hand, the second part and the plate main body are not required to be connected through an additional connecting process, so that the manufacturing process flow is simplified. Meanwhile, compared with the mode that the second part is connected with the plate main body through an additional connecting process, the second part and the plate main body which are in an integrated structure have higher structural strength. In some embodiments of the first aspect, the reinforcement comprises a first reinforcement portion and a second reinforcement portion, the second reinforcement portion being connected between the first reinforcement portion and the plate body, the second reinforcement portion having a modulus of elasticity that is less than a modulus of elasticity of the first reinforcement portion. The second reinforcement portion has a smaller elastic modulus, is relatively soft in texture, and can form deformation buffer between the first reinforcement piece and the plate main body when the b