CN209641720U - battery box - Google Patents

Abstract

The utility model discloses a battery box. The battery box comprises: a battery pack, two or more battery packs are arranged side by side, and each battery pack includes two or more single cells stacked along a first direction; a first heat insulation pad, which clamps Set between two adjacent battery packs, the first heat insulation pad includes two opposite surfaces, wherein at least one surface is provided with a limit structure raised on the opposite surface, and the limit structure is inserted in the battery pack adjacent to the between the single cells. According to the battery box of the embodiment of the present invention, when a thermal runaway phenomenon occurs in one of the single cells, the speed at which the thermal runaway spreads to other single cells can be reduced. The limiting structure makes the position of the first heat insulating pad and the single battery more stable, and prevents the first heat insulating pad from being displaced to form a protection loophole in the process of vibration and impact.

Description

battery box

technical field

The utility model relates to the field of batteries, in particular to a battery box.

Background technique

With the enhancement of environmental awareness and the development of low-carbon economy, more and more electronic fields use rechargeable and dischargeable lithium-ion batteries as power sources, such as mobile phones, notebook computers, power tools and electric vehicles.

Take lithium-ion batteries used in electric vehicles as an example, they are mainly used as power batteries for electric vehicles. In order to improve the endurance performance of electric vehicles, the power battery and the single cell in the power battery are gradually developing towards a system with high energy density, and the volume of the single cell is also increasing.

However, at the same time, in order to obtain higher energy density, the group structure of single cells is becoming more and more compact. Single cells with high energy density and high energy density have problems of large heat release, long duration, and high degree of harm during thermal failure. Heat spread, thereby affecting the quality of the entire battery box.

Utility model content

The embodiment of the present invention provides a battery box, which improves the thermal insulation performance between the single cells.

An embodiment of the present invention provides a battery box, which includes: a battery pack, two or more battery packs are arranged side by side, each battery pack includes two or more single cells stacked along a first direction; a first heat insulation pad sandwiched between Between two adjacent battery packs, the first heat insulation pad includes two opposite surfaces, wherein at least one surface is provided with a limiting structure protruding from the opposite surface, and the limiting structure is inserted in the adjacent battery packs. between single cells.

According to an aspect of the embodiment of the present invention, the battery box further includes: a second heat insulating pad, sandwiched between adjacent single cells in the battery pack, and the second heat insulating pad is connected to the limiting structure in a one-to-one correspondence.

According to an aspect of the embodiments of the present invention, the limiting structure is a limiting bar extending continuously along the second direction, or the limiting structure includes two or more limiting blocks arranged along the second direction.

According to an aspect of the embodiment of the present invention, the second heat insulating pad and the limiting structure are bonded to each other.

According to an aspect of the embodiment of the present invention, the size of the second heat insulating pad in the first direction is the same as the size of the corresponding limiting structure in the first direction.

According to an aspect of the embodiments of the present invention, the size of each limiting structure in the first direction is 1 mm to 10 mm.

According to an aspect of the embodiments of the present invention, the size of each limiting structure in the first direction is 2 mm to 3 mm.

According to an aspect of the embodiment of the present invention, the size of each limiting structure relative to the surface protrusion is 1 mm to 5 mm.

According to an aspect of the embodiment of the present invention, the size of the relative surface protrusion of each limiting structure is 2 mm to 3 mm.

According to an aspect of the embodiment of the present invention, the battery box further includes: a box body, including an accommodating space, and two or more battery packs are arranged in the accommodating space of the box body.

According to the battery box of the embodiment of the present invention, the first heat insulating pad is sandwiched between two adjacent battery packs. At least one surface of the first heat insulating pad is provided with a limit structure, and the limit structure is inserted between the adjacent single cells in the battery pack, so that the adjacent single cells in the battery pack are spaced from each other, and the single cells are improved. The thermal insulation performance between adjacent cells reduces the heat exchange between adjacent single cells. When thermal runaway occurs in one of the single cells, the speed at which the thermal runaway spreads to other single cells can be reduced. The limiting structure makes the position of the first heat insulating pad and the single battery more stable, and prevents the first heat insulating pad from being displaced to form a protection loophole in the process of vibration and impact.

In some optional embodiments, the battery box further includes a second heat insulation pad, wherein the second heat insulation pad is sandwiched between adjacent single cells in the battery pack, and is connected to the limiting structure in a one-to-one correspondence, so that The first thermal insulation pad and the second thermal insulation pad form a grid-shaped thermal insulation structure, and each single cell is in a relatively independent thermal insulation space. When a single cell is thermally out of control, the grid-shaped thermal insulation The structure can inhibit the spread of heat to the surrounding of the single battery, and effectively prevent the spread of thermal runaway.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent upon reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar features.

1 shows a perspective view of a battery box according to an embodiment of the present invention;

2 shows an exploded perspective view of a battery box according to an embodiment of the present invention;

3 shows a side view of a battery box according to an embodiment of the present invention;

Figure 4 shows a cross-sectional view along the A-A direction in Figure 3;

5 shows a perspective view of a first thermal insulation pad in a battery box according to an embodiment of the present invention;

6 shows a side view of a first thermal insulation pad in a battery box according to an embodiment of the present invention;

FIG. 7 shows a top view of a first thermal insulation pad in a battery box according to an embodiment of the present invention;

FIG. 8 shows a partial enlarged view of area B in FIG. 7 .

In the picture:

100-battery box;

110a-battery pack; 110-single cell;

120-the first thermal insulation pad; 121-surface; 122-limiting structure;

130-Second thermal pad;

140-box;

X-first direction; Y-second direction;

W - the size of the limiting structure in the first direction;

H - the size of the protrusion of the limiting structure relative to the surface.

Detailed ways

The features and exemplary embodiments of various aspects of the present utility model will be described in detail below. In order to make the purpose, technical solutions and advantages of the present utility model more clear, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. . It should be understood that the specific embodiments described herein are only configured to explain the present invention, and are not configured to limit the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present invention by illustrating examples of the present invention.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprises" does not preclude the presence of additional identical elements in a process, method, article, or device that includes the element.

It will be understood that, in describing the structure of a component, when a layer or region is referred to as being "on" or "over" another layer or region, it can be directly on the other layer or region, or Other layers or regions are also included between it and another layer, another region. And, if the part is turned over, that layer, one area, will be "below" or "beneath" another layer, another area.

An embodiment of the present invention provides a battery box. Figures 1, 2, and 3 respectively show a perspective view, an exploded perspective view, and a side view of a battery box according to an embodiment of the present invention. Figure 4 shows the direction A-A in Figure 3. sectional view.

The battery box 100 may include a box body 140 and a battery pack 110a, the box body 140 includes a accommodating space, and two or more battery packs 110a are disposed in the accommodating space of the box body 140 . In order to clearly show the internal structure of the battery box 100 , FIGS. 1 to 3 only show the bottom plate structure in the box body 140 . In some embodiments, the box body 140 may also have a top plate structure and a side wall structure, so that the two The above battery pack 110a is covered and provided with certain protection.

The battery case 100 may include two or more battery packs 110a, wherein the two or more battery packs 110a are arranged side by side. Each battery pack 110a includes two or more unit cells 110 stacked along the first direction X. In some embodiments, the single cell 110 may be a prismatic cell including a plurality of substantially rectangular surfaces, wherein the first direction X is, for example, a direction perpendicular to the largest surface of the single cell 110 .

5 , 6 , and 7 respectively show a perspective view, a side view, and a top view of the first thermal insulation pad 120 in the battery box according to the embodiment of the present invention, and FIG. 8 shows a partial enlarged view of area B in FIG. 7 .

The first thermal insulation pad 120 can be made of at least any one of aerogel composite material, inorganic fiber cotton, mica and its composite materials, thermosetting resin foam, inorganic foam, etc. In this embodiment, the first thermal insulation pad 120 For aerogel composite pads.

The first heat insulating pad 120 is sandwiched between two adjacent battery packs 110 . The first heat insulation pad 120 includes two opposite surfaces 121 , wherein at least one surface 121 is provided with a limiting structure 122 protruding from the opposite surface 121 . In the battery box 100, the limiting structure 122 is inserted between the adjacent single cells 110 in the battery pack 110a.

According to the battery box 100 of the embodiment of the present invention, the first heat insulating pad 120 is sandwiched between two adjacent battery packs 110a. At least one surface of the first heat insulating pad 120 is provided with a limiting structure 122, and the limiting structure 122 is inserted between the adjacent single cells 110 in the battery pack 110a, so that the adjacent single cells 110 in the battery pack 110a are mutually The spaced arrangement improves the thermal insulation performance between the single cells 110 and reduces the heat exchange between the adjacent single cells 110 . When a thermal runaway phenomenon occurs in one of the single cells 110 , the speed at which the thermal runaway spreads to other single cells 110 can be reduced.

According to the battery box 100 of the embodiment of the present invention, the limiting structure 122 makes the position of the first heat insulating pad 120 and the single battery 110 more stable, and prevents the first heat insulating pad 120 from being displaced during vibration and shock to form a protection leak.

In some embodiments, the battery case 100 further includes a second thermal pad 130 . The second thermal insulation pad 130 can be made of at least any one of aerogel composite materials, inorganic fiber cotton, mica and its composite materials, thermosetting resin foam, inorganic foam, etc. In this embodiment, the second thermal insulation pad 130 For aerogel composite pads.

The second heat insulating pads 130 are sandwiched between adjacent single cells 110 in the battery pack 110a, and the second heat insulating pads 130 are connected to the limiting structures 122 in a one-to-one correspondence, so that the first heat insulating pads 120 and the second heat insulating pads 120 are connected to each other. The pad 130 forms a grid-like thermal insulation structure, and each unit cell 110 is located in a relatively independent thermally insulated space. When a single unit cell 110 is thermally out of control, the grid-like thermal insulation structure can restrain the heat from entering the unit. spread around the bulk battery 110, effectively preventing the spread of thermal runaway.

In some embodiments, the second heat insulating pad 130 and the limiting structure 122 are in physical contact with and connected to each other. In some embodiments, the second heat insulating pad 130 and the limiting structure 122 are bonded to each other. Specifically, the second heat insulating pad 130 and the limiting structure 122 can be bonded to each other by materials such as structural adhesive, double-sided tape, sealant, etc., so that the connection between the second heat insulating pad 130 and the limiting structure 122 is more stable, so as to make the connection with the limiting structure 122 more stable. The first heat insulating pad 120 is assembled into a grid-like heat insulating structure with a more stable structure, so as to reduce the protection loopholes caused by displacement.

As shown in FIG. 5 and FIG. 6 , in some embodiments, the limiting structure 122 is a limiting bar extending continuously along the second direction Y. The second direction Y intersects the first direction X, and in some embodiments, the second direction Y is perpendicular to the first direction X. In some embodiments, the second direction Y is a direction perpendicular to the surface of the bottom plate in the box 140 .

In some other embodiments, the limiting structure 122 may not be limited to the above-mentioned continuously extending limiting bar structure, for example, the limiting structure 122 may also include more than two limiting blocks arranged along the second direction Y.

In this embodiment, the two opposite surfaces 121 of each first heat insulating pad 120 are provided with a plurality of limiting structures 122 . Wherein, on each surface 121, a plurality of limiting structures 122 are arranged at equal intervals, and the limiting structures 122 on the two surfaces 121 are arranged symmetrically with each other. Correspondingly, both sides of the first thermal insulation pad 120 can be connected to the second thermal insulation pads 130, and the second thermal insulation pads 130 are arranged at equal intervals, so that the plurality of single cells 110 of the battery box 100 are protected by the first thermal insulation pads 120. The second thermal insulation pads 130 are evenly spaced to provide stable performance of slowing down the spread of thermal runaway.

The material of the limiting structure 122 includes, but is not limited to, rubber, plastic, resin, fiber paper, mica sheet, foam, and the like. In this embodiment, the limiting structure 122 is made of rubber or foam, for example. The limiting structure 122 may be integrally formed on the surface 121 of the first thermal insulation pad 120 or bonded to the surface 121 of the first thermal insulation pad 120 .

In some embodiments, the spacing between adjacent limiting structures 122 on the same surface 121 of the first thermal pad 120 may match the thickness of the single cell 110 or be configured according to the thickness of the single cell 110 . The thickness of the single cell 110 is the distance between two opposite surfaces of the single cell 110 in the first direction X. As shown in FIG. The position of the limiting structure 122 is set according to the thickness of the unit cells 110 and the spacing coordinates of the unit cells 110 .

In some embodiments, the thickness of the second heat insulation pad 130 , that is, the dimension of the second heat insulation pad 130 in the first direction X, is the same as the dimension of the corresponding limiting structure 122 in the first direction X, so as to further realize the battery The unit cells 110 in the group 110a are arranged at equal intervals from each other.

As shown in FIG. 8 , in some embodiments, the dimension W of each limiting structure 122 in the first direction X is 1 mm to 10 mm, so that the interval between adjacent single cells 110 in the battery pack 110 a is within a reasonable range , to achieve effective thermal insulation performance and slow the spread of thermal runaway.

In some embodiments, the dimension W of each limiting structure 122 in the first direction X is 2 millimeters to 3 millimeters, so that the interval between adjacent single cells 110 in the battery pack 110 a can achieve effective spacing between the single cells 110 . While improving the thermal insulation performance and slowing down the spread of thermal runaway, it ensures that the single cells 110 of the battery pack 110a are more compactly arranged, so that the battery box 100 can maintain a high energy density.

As shown in FIG. 8 , in some embodiments, the protruding dimension H of each limiting structure 122 relative to the surface 121 is 1 mm to 5 mm. By reasonably configuring the dimension H of the limiting structure 122 relative to the surface 121, the limiting structure 122 can stably separate the adjacent single cells 110 in the battery pack 110a from each other, and at the same time facilitate the limiting structure 122 and the second heat insulation The pads 130 are connected to each other.

In some embodiments, the protruding dimension H of each limiting structure 122 relative to the surface 121 is 2 mm to 3 mm, so that the limiting structure 122 can be more stably connected with the second heat insulation pad 130 and at the same time, the The arrangement area of the second thermal insulation pads 130 between the adjacent single cells 110 in the battery pack 110a is configured to improve the thermal insulation performance and slow down the thermal runaway spreading performance.

In the battery box 100 of the embodiment of the present invention, a first heat insulation pad 120 is disposed between two adjacent battery packs 110a, and at least one surface of the first heat insulation pad 120 is provided with a limiting structure 122, so that the battery pack 110a is placed in the battery pack 110a. Adjacent unit cells 110 are spaced apart from each other. In the above structure, the unit cells 110 are spaced apart from each other to improve the thermal insulation performance between the unit cells 110 and reduce the heat exchange between the adjacent unit cells 110 .

According to the battery box 100 of the embodiment of the utility model, when a thermal runaway phenomenon occurs in one of the single cells 110 , the speed at which the thermal runaway spreads to other single cells 110 can be reduced. The limiting structure 122 is formed on the surface of the first heat insulation pad 120 , so that the position of the first heat insulation pad 120 and the single battery 110 is more stable, and the displacement of the first heat insulation pad 120 during vibration and shock is prevented to form a protection leak.

According to the above-mentioned embodiments of the present invention, these embodiments do not describe all the details in detail, nor do they limit the present invention to only the described specific embodiments. Obviously, many modifications and variations are possible in light of the above description. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can make good use of the present utility model and modifications based on the present utility model. . The present invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. a kind of battery case (100) characterized by comprising

Battery pack (110a), more than two battery packs (110a) are arranged side by side, and each battery pack (110a) includes along the More than two single batteries (110) that one direction (X) stacks；

First heat insulating mattress (120) is folded between the two neighboring battery pack (110a), the first heat insulating mattress (120) packet Include two opposite surfaces (121), wherein at least one described surface (121) is equipped with the limit of relatively described surface (121) protrusion Bit architecture (122),

The position limiting structure (122) is inserted between the single battery (110) adjacent in the battery pack (110a).

2. battery case (100) according to claim 1, which is characterized in that further include:

Second heat insulating mattress (130) is folded in the battery pack (110a) between the adjacent single battery (110), and described Two heat insulating mattress (130) connect one to one with the position limiting structure (122).

3. battery case (100) according to claim 2, which is characterized in that the position limiting structure (122) is in a second direction (Y) positive stop strip or the position limiting structure (122) being extended continuously include more than two limits of (Y) setting in a second direction Position block.

4. battery case (100) according to claim 2, which is characterized in that second heat insulating mattress (130) and the limit Structure (122) is mutually bonded.

5. battery case (100) according to claim 2, which is characterized in that second heat insulating mattress (130) is described first Size on direction (X) is identical as size of the corresponding position limiting structure (122) on the first direction (X).

6. battery case (100) according to claim 1, which is characterized in that each position limiting structure (122) is described Size on one direction (X) is 1 millimeter to 10 millimeters.

7. battery case (100) according to claim 6, which is characterized in that each position limiting structure (122) is described Size on one direction (X) is 2 millimeters to 3 millimeters.

8. battery case (100) according to claim 1, which is characterized in that each position limiting structure (122) is relatively described The size of surface (121) protrusion is 1 millimeter to 5 millimeters.

9. battery case (100) according to claim 8, which is characterized in that each position limiting structure (122) is relatively described The size of surface (121) protrusion is 2 millimeters to 3 millimeters.

10. battery case (100) according to claim 1, which is characterized in that further include:

Cabinet (140), including accommodation space, more than two battery packs (110a) are set to the appearance of the cabinet (140) It receives in space.