CN215184223U

CN215184223U - Battery pack

Info

Publication number: CN215184223U
Application number: CN202120982791.8U
Authority: CN
Inventors: 牛力; 李新建; 张轩; 候爱生; 李周礼; 孙国华; 郭其鑫
Original assignee: China Aviation Lithium Battery Co Ltd; CALB Technology Co Ltd
Current assignee: Avic Innovation Technology Research Institute Jiangsu Co ltd; China Aviation Lithium Battery Co Ltd; China Lithium Battery Technology Co Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-12-14
Anticipated expiration: 2031-05-10

Abstract

The present application provides a battery pack. The battery pack includes: the battery comprises a plurality of batteries, a plurality of connecting rods and a plurality of connecting rods, wherein the batteries are arranged along a set direction, each battery is provided with a battery cell accommodated in a battery shell, and each battery cell is provided with a battery cell body and a lug extending from the battery cell body; a heat insulating mat disposed between at least one pair of two batteries adjacent in the set direction; wherein orthographic projections of the lugs of the two batteries adjacent to the heat insulation pad in a reference plane and orthographic projections of the heat insulation pad in the reference plane are at least partially overlapped, and the reference plane is a plane perpendicular to the set direction. The battery pack of the present application has good thermal stability.

Description

Battery pack

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery pack.

Background

The battery pack is, for example, a battery module or a battery pack. A battery module generally has a housing and a row of batteries disposed in the housing. When one of the batteries is thermally out of control, the other batteries should be prevented from being affected.

In the related art, a rectangular heat insulating mat is disposed between adjacent cells, and a rectangular buffer frame is disposed to surround four sides of the heat insulating mat. The buffer frame is used for relieving mutual extrusion between adjacent batteries. The role of the insulating mat is to reduce the thermal conduction between adjacent cells. The heat insulation effect of the buffer frame is generally inferior to that of the heat insulation pad, and the buffer frame is generally opposite to the tab inside the battery due to the tight structural design requirement of the battery module, which is disadvantageous to inhibit the conduction of heat of the battery.

SUMMERY OF THE UTILITY MODEL

The purpose of this application is to prior art's weak point, provides a group battery.

In order to solve the technical problem, the following technical scheme is adopted in the application: a battery pack, comprising: the battery comprises a plurality of batteries, a plurality of connecting rods and a plurality of connecting rods, wherein the batteries are arranged along a set direction, each battery is provided with a battery cell accommodated in a battery shell, and each battery cell is provided with a battery cell body and a lug extending from the battery cell body; a heat insulating mat disposed between at least one pair of two batteries adjacent in the set direction; wherein orthographic projections of the lugs of the two batteries adjacent to the heat insulation pad in a reference plane and orthographic projections of the heat insulation pad in the reference plane are at least partially overlapped, and the reference plane is a plane perpendicular to the set direction.

Compared with the prior art, the beneficial effect of this application is: in the embodiment of the present application, the heat insulation pad is disposed opposite to the tab, rather than using the buffer frame opposite to the tab as in the prior art, and the heat conduction from the tab of one battery to the tab of the other battery is more effectively suppressed. This structure reduces the risk of thermal diffusion when a certain thermal runaway of the cell occurs.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is an exploded view of a battery pack according to an embodiment of the present application.

Fig. 2 is an orthographic projection of a part of the structure in the battery pack shown in fig. 1 in a reference plane.

Fig. 3 is an exploded view of a battery pack according to another embodiment of the present application.

Fig. 4 is an orthographic projection of a part of the structure in the battery pack shown in fig. 3 in a reference plane.

Wherein, 1, a battery; 11. a tab; 2. a heat insulating pad; 3. a buffer frame; 4. an end plate; 5. a side plate; 6. a cover plate; 7. wire harness board assembly.

Detailed Description

In this application, it will be understood that terms such as "including" or "having," are intended to indicate the presence of the disclosed features, integers, steps, acts, components, groups or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, acts, components, groups or groups thereof, plural of which is at least 2 or more.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The application is further described with reference to examples of embodiments shown in the drawings.

Referring to fig. 1 to 4, an embodiment of the present application provides a battery pack including:

a plurality of batteries 1, the plurality of batteries 1 being arranged in a set direction, the batteries 1 having a cell (not shown) accommodated in a battery case, the cell having a cell body and a tab 11 extending from the cell body;

a heat insulating mat 2, the heat insulating mat 2 being disposed between at least one pair of adjacent two batteries 1;

wherein, the orthographic projection of the lug 11 of the two batteries 1 adjacent to the heat insulation pad 2 in a reference plane and the orthographic projection of the heat insulation pad 2 in the reference plane are at least partially overlapped, and the reference plane is a plane perpendicular to the set direction (namely, the plane where the heat insulation pad 2 is located).

In the embodiment shown in fig. 1 and 3, the battery 1 is flat, and the battery 1 is arranged in the thickness direction thereof.

Specifically, referring to fig. 1 and 3, the battery pack is a battery module in which the batteries 1 are arranged in a row in the thickness direction thereof, the display panel assembly 7 realizes series and parallel connection between the batteries 1, and the periphery of the batteries 1 is surrounded by a pair of side plates 5, a pair of end plates 4, a cover plate 6, and a bottom plate (not shown) opposite to the cover plate 6. The battery 1 is provided with tabs 11 therein.

The battery pack may also be a battery pack. In some embodiments, a plurality of battery modules are assembled into one battery pack. While in other embodiments a battery pack is assembled directly from a plurality of batteries 1.

The application does not limit the internal structure of the battery 1 and the external structure of the whole row of batteries 1 in the battery pack, and can be designed according to the prior art. For example, the structure of the cell body inside the battery 1 and the tab 11 extending from the cell body may be designed according to the prior art.

The main function of the insulation mat 2 is insulation. The heat insulating pad 2 is disposed to be opposed to the tab 11 so that the tab 11 of the adjacent battery 1 is separated by the heat insulating pad 2, rather than using the buffer frame 3 to be opposed to the tab 11 as in the prior art, the heat conduction from the tab 11 of one battery 1 to the tab 11 of the other battery 1 is more effectively suppressed. This structure reduces the risk of thermal diffusion when thermal runaway of a certain cell 1 occurs.

Referring to fig. 1, when the tabs 11 of the cells 1 are pushed out (i.e., the tabs 11 extend upward in a normal state of the battery pack), the heat insulating mats 2 should extend upward as much as possible to better insulate the tabs 11 of the adjacent cells 1.

Referring to fig. 3, when the tabs 11 of the cells 1 are laterally out (i.e., the tabs 11 extend toward the two side plates 5 in the normal placement state of the battery pack), the heat insulating mat 2 should extend toward the side plates 5 as much as possible to better insulate the tabs 11 of the adjacent cells 1.

Thus, in some embodiments, referring to fig. 2 and 4, the orthographic projection of the tab 11 of the cell 1 adjacent to the insulation mat 2 in the reference plane is located within the orthographic projection of the insulation mat 2 in the reference plane.

I.e., the heat insulating mat 2 completely separates the tabs 11 of the adjacent cells 1. Of course, the heat insulating mat 2 may be opposite to only a partial region of the tab 11, if there are other constraints limited to the structural design of the battery pack.

In some embodiments, the boundary of the side of the heat insulating mat 2 opposite to the tab 11 is flush with the boundary of the battery 1.

For example, referring to fig. 1, the upper boundary of the heat insulating mat 2 is flush with the upper boundary of the battery 1.

For another example, referring to fig. 3, the boundary of the heat insulating mat 2 facing the side plate 5 is flush with the boundary of the battery 1 facing the side plate 5.

In this way, the area of the heat insulating mat 2 between the batteries 1 and 1 is as large as possible, resulting in a better heat insulating effect.

In some embodiments, referring to fig. 1 to 4, the battery pack further includes a buffer frame 3 disposed on a side of the heat insulation mat 2.

The buffer frame 3 is stronger in mechanical strength than the heat insulating mat 2, and relatively poor in heat insulating effect. The buffer frame 3 functions to support the heat insulating mat 2 and to relieve the expansion and compression of the adjacent cells 1 with each other.

Referring to fig. 1 and 2, the tab 11 of the battery 1 extends upward (also called tab ejection), and the buffer frames 3 are disposed on both sides of the heat insulating mat 2 in horizontally opposite directions and on the bottom side.

In this manner, the upper boundary of the heat insulating mat 2 can be extended upward to better insulate heat conduction between the tabs 11 of the adjacent cells 1.

According to the current view of fig. 2, the upper surface of the heat insulating mat 2 is flush with the upper surface of the cushion frame 3. In other embodiments, the heat insulating mat 2 may extend upward beyond the upper surface of the cushion frame 3 and the portions beyond extend to the left and right, thereby covering the upper surface of the cushion frame 3.

In some embodiments, referring to fig. 3 and 4, the tabs 11 of the battery 1 extend in two opposite directions in the lateral direction (also called tab-out), and the buffer frames 3 are disposed on the top and bottom sides of the thermal insulation mat 2.

In this way, according to the current view of fig. 4, the heat insulating mat 2 can be extended to the left and right as much as possible, thereby better isolating the tabs 11 of the batteries 1 on both sides of the heat insulating mat 2.

According to the current view of fig. 4, the left and right boundaries of the heat insulating mat 2 are flush with the left and right boundaries of the cushion frame 3, but of course, the heat insulating mat 2 may also be beyond the cushion frame 3 in the left and right direction.

The tab 11 is provided inside the case of the battery 1. Note that the tab 11 is labeled in fig. 2 and 4 as an orthographic projection of the tab on a reference plane.

In some embodiments, the material of the buffer frame 3 includes: silicone, metal, plastic, or hard rubber.

In some embodiments, the material of the insulation mat 2 comprises: thermal insulation cotton, soft rubber, foam or aerogel.

The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The protective scope of the present application is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present application by those skilled in the art without departing from the scope and spirit of the present application. It is intended that the present application also include such modifications and variations as come within the scope of the appended claims and their equivalents.

Claims

1. A battery pack, comprising:

the battery pack comprises a plurality of batteries (1), wherein the batteries (1) are arranged along a set direction, the batteries (1) are provided with battery cells accommodated in a battery shell, and the battery cells are provided with battery cell bodies and lug lugs extending from the battery cell bodies;

a heat insulating mat (2), the heat insulating mat (2) being disposed between at least one pair of two batteries (1) adjacent in the set direction;

wherein orthographic projections of the lugs of the two batteries (1) adjacent to the heat insulation pad (2) in a reference plane and orthographic projections of the heat insulation pad (2) in the reference plane are at least partially overlapped, and the reference plane is a plane perpendicular to the set direction.

2. Battery pack according to claim 1, characterized in that the orthographic projection of the tabs of the cells (1) adjacent to the insulation mat (2) in the reference plane is located within the orthographic projection of the insulation mat (2) in the reference plane.

3. The battery pack according to claim 2, wherein the boundary of the side of the heat insulating mat (2) opposite to the tab is flush with the boundary of the battery (1).

4. The battery pack according to claim 1, further comprising a buffer frame (3) provided on a side of the heat insulating mat (2).

5. Battery pack according to claim 4, characterised in that the tabs of the cells (1) extend upwards and the buffer frame (3) is arranged on the two horizontally opposite sides and on the bottom side of the insulation mat (2).

6. Battery pack according to claim 4, characterised in that the tabs of the cells (1) extend in two opposite directions in the transverse direction, the cushioning frame (3) being provided on the top and bottom sides of the insulating mat (2).

7. The battery pack according to claim 4, wherein the material of the buffer frame (3) comprises: silicone, metal, plastic, or hard rubber.

8. Battery pack according to claim 1, characterized in that the material of the insulating mat (2) comprises: thermal insulation cotton, soft rubber, foam or aerogel.

9. The battery pack according to claim 1, wherein the battery pack is a battery module or a battery pack.