CN218334170U

CN218334170U - Battery device

Info

Publication number: CN218334170U
Application number: CN202222324673.5U
Authority: CN
Inventors: 杨绪龙; 王帅锋; 曹智娟
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-01-17
Anticipated expiration: 2032-08-31

Abstract

The utility model relates to a battery technology field discloses a battery device for reduce the risk that causes thermal runaway to stretch when thermal runaway appears in certain battery. The battery device comprises a bottom plate and a plurality of batteries arranged above the bottom plate, wherein the batteries are stacked along a first direction, each battery comprises a battery main body, a bottom flange is arranged at the bottom of each battery main body, the bottom flange extends along a second direction, the second direction is perpendicular to the first direction and parallel to the bottom surface of each battery main body, the bottom flanges are separated in a gap between each battery main body and the bottom plate to form a plurality of pressure relief channels, and the pressure relief channels are in one-to-one correspondence with the batteries; the bottom of the battery main body is also provided with a weak part which is positioned in the pressure relief channel.

Description

Battery device

Technical Field

The utility model relates to a battery technology field especially relates to a battery device.

Background

One of unsafe factors of the batteries in the using process is thermal runaway, when a certain battery is in thermal runaway, the released heat is transferred to the periphery to cause thermal diffusion, and other adjacent batteries are easily caused to have thermal runaway, so that serious safety accidents such as fire and explosion can be caused, and how to reduce the risk of spreading the thermal runaway is an important means for guaranteeing the safe use of the batteries.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery device for reduce and take place the risk that thermal runaway caused thermal runaway to stretch when certain battery easily.

The embodiment of the utility model provides a battery device, this battery device includes the bottom plate and sets up a plurality of batteries above the bottom plate, and a plurality of the battery is along first direction stack setting, the battery includes the battery main part, the bottom of battery main part is provided with the bottom flange, the bottom flange extends along the second direction, the second direction is perpendicular to the first direction and is on a parallel with the bottom surface of battery main part, the bottom flange separates in the clearance between battery main part and the bottom plate and forms a plurality of pressure release passageways, pressure release passageway with the battery one-to-one;

the bottom of the battery main body is also provided with a weak part, and the weak part is positioned in the pressure relief channel.

The utility model discloses beneficial effect as follows:

in the battery device, batteries are stacked along a first direction, and the bottom of each battery main body is provided with a bottom flange and a weak part, wherein the bottom flange lifts the battery main body away from the surface of the bottom plate, the bottom flange is separated in a gap between the battery main body and the bottom plate to form a plurality of pressure relief channels, the pressure relief channels correspond to the batteries one to one, the weak parts of the batteries are located in the corresponding pressure relief channels, when the batteries are out of control due to heat, the weak parts are exploded under larger pressure, substances such as gas and electrolyte in the batteries enter the pressure relief channels, and the bottom flange can prevent the high-temperature substances from flowing to other batteries, so that the heat diffusion is reduced, and the risk of out of control due to heat of other batteries is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of the battery shown in fig. 1, perpendicular to a second direction (X-axis direction);

fig. 3 is a cross-sectional view perpendicular to a second direction (X-axis direction) after the battery shown in fig. 1 is assembled with a base plate;

fig. 4 is a cross-sectional view perpendicular to the second direction (X-axis direction) after the battery according to the embodiment of the present invention is assembled with the bottom plate;

fig. 5 is an exploded view of a battery and a frame formed by a bottom bracket, a top bracket, and two side brackets according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of the framed battery shown in fig. 5, perpendicular to the second direction (X-axis direction).

Reference numerals:

10-a base plate; 20-a battery; 21-a battery body; 22-bottom flange; 23-a top flange; 24-side flanges; 25-a weakening; 210-a bottom surface; 211 — a first surface; 212-a second surface; 30-a pressure relief channel; 40-a bottom support; 401-grooves; 50-a top support; 60-side support; 70-end insulating plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a battery device for reduce the risk that causes thermal runaway to stretch easily when certain battery takes place the thermal runaway.

As shown in fig. 1, 2, 3, and 4, the battery device includes a base plate 10 and a plurality of batteries 20 disposed above the base plate 10, the plurality of batteries 20 are stacked in a first direction, each battery 20 includes a battery body 21, a bottom flange 22 is disposed at a bottom of the battery body 21, the bottom flange 22 extends in a second direction, the second direction is perpendicular to the first direction and is parallel to a bottom surface of the battery body 21, the bottom flange 22 is partitioned into a plurality of pressure relief channels 30 in a gap between the battery body 21 and the base plate 10, and the pressure relief channels 30 correspond to the batteries 20 one to one;

the bottom of the battery body 21 is also provided with a weak portion 25, and the weak portion 25 is located in the pressure relief channel 30.

Specifically, the first direction is a Y-axis direction in fig. 3 and 4, the plurality of batteries 20 are stacked in the direction, each battery 20 includes a battery body 21, the battery body 21 includes a cell and the like, generally, the battery body 21 is a rectangular parallelepiped structure, a bottom flange 22 is provided at a bottom of the battery body 21, the bottom flange 22 is a portion protruding out of the battery body 21, the bottom flange 22 extends in a second direction, the second direction is an X-axis direction in fig. 1 and 2, the second direction is perpendicular to the first direction, the bottom flange 22 lifts the battery body 21 away from a surface of the bottom plate 10, so that a gap is generated between the battery body 21 and the bottom plate 10, when the plurality of batteries 20 are stacked in the first direction, the bottom flange 22 may form a plurality of pressure relief channels 30 in the gap between the bottom plate 10 and the battery body 21, the pressure relief channels 30 correspond to the batteries 20 one-to-one, the pressure relief channels 30 are located at a bottom of the corresponding battery 20, and adjacent pressure relief channels 30 are separated by the bottom flange 22.

The bottom of the battery main body 21 is further provided with the weak part 25, the weak part 25 is located in the corresponding pressure relief channel 30, when the battery 20 is in thermal runaway, the weak part 25 will deform and explode under the influence of high temperature and high pressure, so that substances such as gas and electrolyte inside the battery 20 enter the pressure relief channel 30, and the bottom flange 22 can prevent the high temperature substances from flowing to other batteries 20, so that the thermal diffusion is reduced, and the risk of thermal runaway of other batteries 20 is reduced.

Specifically, the weakened portion 25 may be formed by performing thinning processing on a local region of the case of the battery 20 to weaken the strength of the local region, or the weakened portion 25 may be formed by providing a notch on the local region of the case of the battery 20 to weaken the strength of the local region, or the weakened portion 25 may be formed by other methods, which are not listed here.

It is to be noted that the bottom surface 210 of the battery main body 21 refers to a surface disposed toward the bottom plate 10 with reference to the use state of the battery 20.

Alternatively, as shown in fig. 3 and 4, the bottom plate 10 has a planar structure at a portion directly below the battery 20.

In other words, the bottom plate 10 is not provided with the recess or the protrusion directly below the battery 20, on one hand, the planar structure is favorable for the bottom plate 10 to support the battery 20, and on the other hand, if the bottom plate 10 is provided with the recess directly below the battery 20 and the recess is located below the bottom flange 22, a larger gap is formed between the bottom flange 22 and the surface of the bottom plate 10 in the recessed region, and when the battery 20 is in thermal runaway, more high-temperature substances can flow to the bottom of other batteries 20 through the gap, so as to increase the risk of thermal runaway of other batteries 20, and therefore, the recess should be avoided being provided in the portion of the bottom plate 10 directly below the battery 20; if the bottom plate 10 is provided with the protrusions directly under the batteries 20, the protrusions will occupy the pressure relief space between the bottom plate 10 and the batteries 20, and will not facilitate the discharge of high temperature substances, so the protrusions should also be avoided on the portion of the bottom plate 10 directly under the batteries 20.

The bottom flange 22 may contact the surface of the bottom plate 10, or may have a smaller gap, and optionally, the bottom flange 22 abuts against the surface of the bottom plate 10, so that there is no gap between the bottom flange 22 and the surface of the bottom plate 10, and the bottom flange 22 may perform a better separation function, so that the pressure relief channels 30 are independent from each other and no communication occurs.

Optionally, bottom flange 22 is located at the edge of bottom surface 210 of cell body 21, which widens pressure relief channel 30 as much as possible and allows pressure relief channel 30 to be located just at the bottom of cell 20.

As shown in fig. 1, the battery main body 21 is a rectangular parallelepiped structure, and includes a first surface 211, the first surface 211 is perpendicular to the first direction and perpendicular to the bottom surface 210, and the bottom flange 22 is located at an edge of the bottom surface 210 and is flush with the first surface 211, where the first surface 211 is a surface with the largest surface area in the battery main body 21, and it can also be understood that the bottom flange 22 is a portion protruding out of the battery main body 21 and formed by extending the first surface 211 toward the bottom plate 10.

As shown in fig. 3, each of the cells 20 is provided with a bottom flange 22, the bottom flange 22 is positioned at the edge of the bottom surface 210 of the cell body 21, and after a plurality of cells 20 are stacked, the pressure relief channel 30 is formed by the bottom flanges 22 of two adjacent cells 20, or the pressure relief channel 30 is formed by the bottom flanges 22 and the end insulating plates 70.

When the bottom flange 22 of each cell 20 is located at the edge of the bottom surface 210 of the cell body 21, the pressure relief channel 30 formed by the bottom flanges 22 of two adjacent cells 20 is located at the bottom of the cell body 21 of exactly one of the cells 20, and since the bottom flanges 22 form barriers at both sides of the pressure relief channel 30, the flow of high-temperature substances to the adjacent cells 20 can be reduced.

As shown in fig. 4, the bottom of the battery main body 21 may be further provided with two bottom flanges 22, and the two bottom flanges 22 are respectively located at two side edges of the bottom surface 210 of the battery main body 21, which are oppositely disposed. The battery body 21 has a rectangular parallelepiped structure, and includes a first surface 211 and a second surface 212, the first surface 211 and the second surface 212 are disposed opposite to each other and perpendicular to the first direction, the number of the bottom flanges 22 is two, one of the two bottom flanges 22 is flush with the first surface 211, and the other is flush with the second surface 212.

In the case that two bottom flanges 22 are provided at the bottom of the battery 20, the pressure relief channel 30 is formed by the two bottom flanges 22 of the same battery 20, the pressure relief channel 30 is located at the bottom of the battery 20, and the weak portion 25 is interposed between the two bottom flanges 22, at this time, the two adjacent pressure relief channels 30 are spaced apart by the two bottom flanges 22, and when thermal runaway occurs in the battery 20, the high-temperature substance is blocked by the two bottom flanges 22, so that the flow of the high-temperature substance to the bottoms of other batteries 20 can be further reduced, and the diffusion of heat can be reduced.

Optionally, the height of the bottom flange 22 is not less than 2.0mm and not more than 8.0mm, for example, the height of the bottom flange 22 may be 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm.

In some embodiments, as shown in fig. 5, the bottom of the battery 20 is provided with a bottom bracket 40, the bottom bracket 40 is used to support the battery 20, and the bottom bracket 40 exposes the weak portion 25.

The bottom bracket 40 has a hollow structure, which can expose the weak portion 25 of the battery 20, and the hollow structure can reduce the space in the occupied pressure relief channel 30.

The bottom bracket 40 is free of the bottom flange 22. As shown in fig. 6, the bottom bracket 40 is provided with a recess 401, the bottom flange 22 is received in the recess 401, and the recess 401 may be provided on the solid structure of the bottom bracket 40. In addition, the bottom bracket 40 may be disposed below the battery body 21 and entirely located at one side of the bottom flange 22 to avoid the bottom flange 22.

The top of the battery main body 21 is provided with a top flange 23 except the bottom flange 22, the top flange 23 extends along the second direction, and two sides of the battery main body 21 oppositely arranged along the second direction are respectively provided with a side flange 24, and the side flanges 24 extend along the third direction; the third direction is perpendicular to the first direction and the second direction, and the third direction is a Z-axis direction in fig. 1.

That is to say, the bottom, the top and both sides of the battery 20 are respectively provided with a flange, the flange is formed by extending the first surface 211 of the battery main body 21 to the periphery, structurally, the flange is a part of the casing of the battery 20, the casing of the battery 20 is composed of two parts, namely a first casing and a second casing, the first casing is provided with a cavity, so as to form an accommodating space for accommodating the electric core, the opening of the cavity is circumferentially provided with a flange edge, the second casing is of a plane structure, the second casing is covered on the first casing and is fixedly connected with the flange edge, and the part of the second casing, which is formed after being fixed with the flange edge and protrudes out of the main body structure, is the flange.

The flange edge is in surface-to-surface contact with the second shell, so that the fixing effect of the first shell and the second shell can be improved.

Further, as shown in fig. 5, a top bracket 50 is disposed on the top of the battery 20, and the top bracket 50 is separated from the top flange 23; the battery 20 is provided at both sides thereof with side brackets 60, respectively, and the side brackets 60 are spaced apart from the side flanges 24.

Bottom support 40, top support 50 and two lateral part supports 60 are the insulating material preparation and form, and these supports can form the protection to the flange that sets up in corresponding side on the one hand, avoid the flange to receive the damage, and on the other hand can also be convenient for fix battery 20, improve battery 20's stability.

The four brackets can be of an integral structure and can also be mutually independent, and two adjacent brackets are connected through a buckle in the assembling process.

Can see through the above description, the embodiment of the utility model provides an among the battery device, bottom flange is set up through the bottom at the battery, thereby lift the battery main part of battery from the surface of bottom plate, and simultaneously, the bottom of battery is provided with the weak part, form pressure release channel between battery and bottom plate at two bottom flanges of weak part both sides, pressure release channel and battery one-to-one, when one of them battery takes place the thermal runaway, the weak part of battery bottom explodes, make among the high temperature material such as the inside gas of battery or electrolyte gets into the pressure release channel who corresponds, the bottom flange can prevent these high temperature materials to flow to other batteries, thermal diffusion has been avoided, thereby avoid causing other batteries to take place the thermal runaway.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A battery device is characterized by comprising a bottom plate and a plurality of batteries arranged above the bottom plate, wherein the batteries are stacked along a first direction and comprise a battery main body, a bottom flange is arranged at the bottom of the battery main body and extends along a second direction, the second direction is perpendicular to the first direction and is parallel to the bottom surface of the battery main body, the bottom flange is separated in a gap between the battery main body and the bottom plate to form a plurality of pressure relief channels, and the pressure relief channels are in one-to-one correspondence with the batteries;

2. The battery device of claim 1, wherein a portion of the bottom plate directly below the battery is a planar structure.

3. The battery device of claim 1 or 2, wherein the bottom flange abuts the bottom plate surface.

4. The battery device according to claim 1 or 2, wherein the bottom flange is located at an edge of a bottom surface of the battery body.

5. The battery device according to claim 4, wherein the number of the bottom flanges is two, and the two bottom flanges are respectively located at two side edges of the bottom surface of the battery main body that are oppositely disposed.

6. The battery device according to claim 1 or 2, wherein the height of the bottom flange is not less than 2.0mm and not more than 8.0mm.

7. The battery device according to claim 1 or 2, wherein a bottom bracket is provided to a bottom of the battery for supporting the battery, and the bottom bracket exposes the weak portion.

8. The battery device of claim 7, wherein the bottom bracket is provided with a recess, the bottom flange being received in the recess.

9. The battery device according to claim 7, wherein a top flange is provided on a top of the battery body, the top flange extending in the second direction, and side flanges are provided on opposite sides of the battery body in the second direction, the side flanges extending in a third direction;

the third direction is perpendicular to the first direction and the second direction.

10. The battery device of claim 9, wherein a top bracket is provided on top of the battery, the top bracket avoiding the top flange;

and the two sides of the battery are respectively provided with a side support, and the side supports avoid the side flanges.