CN216563345U

CN216563345U - Heat insulation structure and battery pack

Info

Publication number: CN216563345U
Application number: CN202122928217.7U
Authority: CN
Inventors: 候爱生; 李新建; 张轩; 牛力; 孙国华; 郭其鑫
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-05-17
Anticipated expiration: 2031-11-26

Abstract

The utility model relates to the technical field of batteries, and provides a heat insulation structure and a battery pack. The heat insulation structure includes: the heat insulation piece comprises a first surface and a second surface which are oppositely arranged; the first buffer piece is arranged on the first surface, so that when the heat insulation structure is used for assembling a battery pack, pretightening force can be provided for the battery by the heat insulation piece and the first buffer piece together, the installation effect is ensured, and enough battery expansion space can be reserved by the compressibility of the heat insulation piece and the first buffer piece.

Description

Heat insulation structure and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a heat insulation structure and a battery pack.

Background

In the related art, a heat insulation structure may be provided between the cells of the battery pack to insulate heat. However, due to the limitation of the heat insulation structure, the pretightening force between the batteries is not easy to guarantee when the battery pack is assembled, so that the assembling effect of the battery pack is affected.

SUMMERY OF THE UTILITY MODEL

The utility model provides a heat insulation structure and a battery pack, which are used for improving the performance of the heat insulation structure.

According to a first aspect of the present invention, there is provided a heat insulating structure comprising:

the heat insulation piece comprises a first surface and a second surface which are oppositely arranged;

the first buffer piece is arranged on the first surface.

The heat insulation structure comprises the heat insulation piece and the first buffer piece, wherein the first buffer piece is arranged on the first surface of the heat insulation piece, so that when the heat insulation structure is used for assembling a battery pack, the heat insulation piece and the first buffer piece can jointly provide pretightening force for a battery, the installation effect is ensured, and enough battery expansion space can be reserved due to the compressibility of the heat insulation piece and the first buffer piece.

According to a second aspect of the present invention, there is provided a battery pack including the above-described heat insulating structure and at least two cells, each of which has a stacking direction perpendicular to the first surface.

The battery pack comprises the heat insulation structure and at least two batteries, wherein the heat insulation structure comprises a heat insulation piece and a first buffer piece, and the first buffer piece is arranged on the first surface of the heat insulation piece, so that when the heat insulation structure is used for assembling the battery pack, the heat insulation piece and the first buffer piece can jointly provide pretightening force for the batteries, the installation effect is ensured, and enough battery expansion space can be reserved due to the compressibility of the heat insulation piece and the first buffer piece.

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 a schematic structural view of an insulation structure according to a first exemplary embodiment;

FIG. 2 is a schematic structural view of an insulation structure according to a second exemplary embodiment;

FIG. 3 is a schematic structural view of an insulation structure according to a third exemplary embodiment;

FIG. 4 is a schematic structural view of an insulation structure according to a fourth exemplary embodiment;

fig. 5 is a schematic structural view showing an insulation structure according to a fifth exemplary embodiment.

The reference numerals are explained below:

1. reserving a buffer space; 10. a thermal insulation member; 11. a first surface; 12. a second surface; 13. a recessed portion; 20. a first buffer member; 21. a through hole; 30. a second buffer.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a heat insulation structure, referring to fig. 1 to 5, the heat insulation structure including: an insulation element 10, the insulation element 10 comprising a first surface 11 and a second surface 12 arranged oppositely; the first buffering member 20 is arranged on the first surface 11, and the first buffering member 20 is arranged on the first surface 11.

The heat insulation structure of one embodiment of the utility model comprises a heat insulation element 10 and a first buffer element 20, wherein the first buffer element 20 is arranged on the first surface 11 of the heat insulation element 10, so that when the heat insulation structure is used for assembling a battery pack, the heat insulation element 10 and the first buffer element 20 can jointly provide pretightening force for a battery, thereby ensuring the installation effect, and enough battery expansion space can be reserved for the compressibility of the heat insulation element 10 and the first buffer element 20.

It should be noted that, the battery pack may include at least two batteries, the heat insulation structure may be disposed between two adjacent batteries, that is, the first surface 11 and the second surface 12 of the heat insulation member 10 may face the two adjacent batteries, respectively, during the assembly of the battery pack, one of the two adjacent batteries contacts the first buffer member 20, and the heat insulation structure is pressed by the two batteries, so that at least one of the heat insulation member 10 and the first buffer member 20 is compressed, thereby ensuring the assembly pre-tightening force of the battery pack, eliminating the manufacturing error and the installation error of the batteries, and facilitating the assembly of the battery pack.

During the use of the battery pack, the cells may expand, and at least one of the thermal insulating member 10 and the first buffer member 20 may be compressed to correspond to the expansion of the cells, thereby ensuring a reliable expansion space between the adjacent cells.

In one embodiment, the thermal insulation element 10 may have a hardness greater than that of the first cushioning element 20, such that the thermal insulation element 10 will be compressed first when the thermal insulation structure is compressed. In some embodiments, it is not excluded that the stiffness of the thermal insulation element 10 may be less than or equal to the stiffness of the first cushioning element 20.

In one embodiment, the heat insulating member 10 may have a plate-shaped structure, and the first buffer member 20 may have a bar-shaped structure.

In one embodiment, the material of the thermal insulation member 10 includes, but is not limited to, ceramic fiber aerogel, glass fiber aerogel, pre-oxidized fiber aerogel, etc., and the material of the first buffer member 20 includes, but is not limited to, silica gel, ceramic silica gel, MPP (modified polypropylene), aerogel, etc.

In one embodiment, as shown in fig. 2, a reserved buffering space 1 is provided between a circumferential outer edge of the first buffering member 20 and a circumferential outer edge of the heat insulating member 10, so that when the first buffering member 20 is connected to the heat insulating member 10, the outer edge of the first buffering member 20 may not be aligned with the heat insulating member 10, which not only facilitates installation of the first buffering member 20, but also improves the manufacturing efficiency and installation efficiency of the first buffering member 20 because the manufacturing accuracy of the first buffering member 20 may be relatively low.

It should be noted that, as shown in fig. 2, a reserved buffer space 1 is provided between the circumferential outer edge of the first buffer member 20 and the circumferential outer edge of the heat insulating member 10, that is, a certain distance is provided between the portion of the first buffer member 20 close to the circumferential outer edge of the heat insulating member 10 and the circumferential outer edge of the heat insulating member 10, when the heat insulating structure is subjected to an extrusion force and the first buffer member 20 is compressed, and when the first buffer member 20 extends in a direction away from the center of the first surface 11, a portion of the first buffer member 20 can be accommodated in the reserved buffer space 1, so that the compressed first buffer member 20 can be prevented from protruding out of the circumferential outer edge of the heat insulating member 10, and the flatness of the battery pack can be ensured. The first cushion 20 may extend away from the center of the first surface 11 when compressed, may extend toward the center of the first surface 11, or may extend toward both the center of the first surface 11 and the center of the first cushion 20 when compressed.

The center of the first surface 11 can be regarded as the center position of the first surface 11, for example, when the first surface 11 is a rectangular surface, the intersection point between two butt lines of the rectangular surface can be regarded as the center of the first surface 11.

In one embodiment, at least a part of the width of the reserved buffer space 1 is a, and a is greater than or equal to 0.5mm and less than or equal to 3mm, so that not only can the reserved buffer space 1 be ensured to have enough fault-tolerant installation space, but also the first buffer member 20 can be prevented from being too close to the center of the first surface 11 to affect the installation effect. a may be 0.5mm, 0.55mm, 0.6mm, 0.7mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 2.95mm, 3mm, or the like.

Referring to fig. 2, the heat insulation member 10 may have a first rectangular structure, and the first buffer member 20 may have a second rectangular structure, in which case the reserved buffer space 1 may form a U-shaped structure, and thus, the width of the reserved buffer space 1 has a1, a2, and a3, in which case at least one of a1, a2, and a3 may be a, i.e., 0.5mm ≦ a1 ≦ 3mm, and/or 0.5mm ≦ a2 ≦ 3mm, and/or 0.5mm ≦ a3 ≦ 3 mm. It is sufficient that one of a1, a2, and a3 satisfies the above condition, i.e., it is not excluded that one or two of a1, a2, and a3 may be equal to 0.

In some embodiments, at least a portion of the outer circumferential edge of the first cushion 20 coincides with the outer circumferential edge of the thermal shield 10, for example, the thermal shield 10 may have a first rectangular configuration and the first cushion 20 may have a configuration disposed around the outer circumferential edge of the first rectangular configuration, in which case the four outer edges of the first cushion 20 may be aligned with the four outer edges of the first rectangular configuration. Alternatively, as shown in fig. 2, the thermal insulation element 10 may have a first rectangular configuration, and the first cushion element 20 may have a second rectangular configuration, in which case, a1, a2, and a3 in fig. 2 may all be 0.

In one embodiment, the heat insulating member 10 may be a flat plate, and the first buffer member 20 may be directly attached to the flat plate, which not only has a low manufacturing cost, but also is convenient for operation.

In one embodiment, as shown in fig. 5, the first surface 11 is provided with the recess 13, and the first buffer member 20 is located in the recess 13, so that not only can the first buffer member 20 be conveniently located, but also the gap between adjacent batteries can be fully utilized, and the heat insulation structure is prevented from occupying too much space.

In some embodiments, the recess 13 may be a groove, for example, a groove formed by stamping or material removal on the thermal insulation element 10, such that the first buffer element 20 is disposed in the groove, in which case the groove may have circumferentially closed sidewalls, or the groove may have at least two opposing sidewalls, and so on.

In some embodiments, the thermal insulation member 10 is a bent member to form the recess 13, that is, the recess 13 is formed by bending a flat plate structure so that the first surface 11 and the second surface 12 each have one plane changed into a combination of a plurality of planes, for example, the recess 13 shown in fig. 5, in which case the recess 13 may be located at an edge position of the thermal insulation member 10, and the recess 13 may have one side wall. Considering that the heat insulating element 10 is a bent element, when the first buffer member 20 is compressed, the heat insulating element 10 can be unfolded, so as to prevent the heat insulating element 10 from cracking due to compression deformation. The specific structure of the recess 13 may be adapted according to the structure of the first buffer 20, and is not limited herein.

It should be noted that the first buffering member 20 may protrude out of the recess 13, that is, the thickness of the first buffering member 20 may be greater than the depth of the recess 13, or the thickness of the first buffering member 20 may be equal to the depth of the recess 13, and the thickness of the first buffering member 20 may be less than the depth of the recess 13, so that the battery can contact the heat insulating member 10 when the battery presses the first buffering member 20 to a certain extent.

In one embodiment, as shown in fig. 1, the surface of the first buffering member 20 facing away from the thermal insulation member 10 has an area S1, and the surface of the first surface 11 has an area S2, wherein S2 is 5% to S1, so that it is avoided that the area of the first buffering member 20 is too small, and when the battery pack is assembled, the pre-tightening force may be insufficient, and the first buffering member is easily squeezed to be excessively deformed while ensuring the sufficient pre-tightening force. Or S1 is not more than S2 × 30%, the problem that the area of the first buffer member 20 is too large can be avoided, and when the battery pack is assembled, the first buffer member 20 excessively extrudes the heat insulation member 10, so that the performance of the heat insulation member 10 is poor. Or S2 is more than or equal to 5% and more than or equal to S1 is more than or equal to S2 is more than or equal to 30%, and the first buffer piece 20 can provide enough pretightening force to avoid excessive extrusion of the heat insulation piece 10 when the battery pack is assembled. S1 may be equal to S2 × 5%, S2 × 5.1%, S2 × 5.5%, S2 × 6%, S2 × 8%, S2 × 10%, S2 × 15%, S2 × 20%, S2 × 25%, S2 × 26%, S2 × 27%, S2 × 28%, S2 × 28.5%, S2 × 29%, S2 × 29.2%, S382 × 29.5%, S2 × 29.6%, S2 × 29.7%, S2 × 29.8%, S2 × 29.85%, S2 × 29.9%, S2 × 29.91%, S68529.6854 × 29.68529.6%, S2 × 2%, S68529.97%, and so on.

In one embodiment, as shown in fig. 1, the first buffer member 20 is disposed around the circumferential outer edge of the heat insulating member 10 to form the through hole 21, that is, the first buffer member 20 is formed at the circumferential edge of the heat insulating member 10, so that sufficient pre-tightening force can be provided to the battery and structural strength can be ensured.

The heat insulating member 10 may have a first rectangular structure, and in this case, the first buffer member 20 may include 4 strip-shaped structures, and three strip-shaped structures are sequentially spliced along four edges of the first rectangular structure, thereby forming a rectangular through hole 21 therein, as shown in fig. 1 and 3. The 4 strip-like structures may be integrally formed as shown in fig. 3. The 4 strip structures may also be spliced by independent structures, which is not limited herein.

In one embodiment, the first buffer 20 may include two strip structures, and the two strip structures may be oppositely disposed, so that a structure as shown in fig. 2 may be formed.

In some embodiments, two strip-like structures may be provided on both the upper and lower sides of the insulation member 10 as shown in fig. 2.

In some embodiments, the first buffer member 20 may include four bar structures, and the four bar structures are disposed on the upper, lower, left and right sides of the heat insulating member 10 as shown in fig. 2, in this case, the four bar structures may be spaced apart.

In some embodiments, the first buffer 20 may include three strip structures, and the three strip structures may form a U-shaped structure, as shown in fig. 4. The opening of the U-shaped structure may be located on either the upper side, the lower side, or the left and right sides of the thermal insulation member 10 as shown in fig. 2.

In one embodiment, as shown in FIG. 1, the insulation structure further comprises: the second buffer member 30 and the second buffer member 30 are disposed on the second surface 12, so that the heat insulation structure can provide pre-tightening force to the battery through the heat insulation member 10, the first buffer member 20 and the second buffer member 30, the installation effect is ensured, and the expansion space of the battery can be further improved.

In one embodiment, as shown in fig. 1, the thickness of the first buffer member 20 is d1, the thickness of the heat insulating member 10 is d2, and the thickness of the second buffer member 30 is d3, wherein d1 is not less than 0 and not more than 2 × d2, and d3 is not less than 0 and not more than 2 × d2, so that after the battery pack is stacked, a certain distance can be provided between the battery and the heat insulating member 10, and the distance and the compressibility of the heat insulating member 10 provide an expansion space for the battery to circulate, thereby ensuring the cycle life of the battery.

In one embodiment, d2 is larger than or equal to 2mm and smaller than or equal to 4mm, which not only can make the heat insulation element 10 have enough heat insulation function, but also can avoid the problem that the heat insulation element 10 is too thick and occupies a large space. d2 may be 2mm, 2.05mm, 2.1mm, 2.3mm, 2.5mm, 3mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.8mm, 3.9mm, 3.95mm, or 4mm, and so forth.

In one embodiment, the material of the second buffer 30 includes, but is not limited to, silicone, ceramic silicone, MPP (modified polypropylene), or aerogel strip, among others.

It is noted that, for the above-described embodiment, the thermal insulation member 10 may be a first rectangular structure, which may include two large surfaces and four small surfaces opposite to each other, and the first surface 11 and the second surface 12 in the above-described embodiment may be two large surfaces.

It should be noted that the structure and the arrangement of the second buffer member 30 may be the same as the first buffer member 20, and are not described herein again. In some embodiments, it is not excluded that the second dampener 30 is not configured and arranged in a manner consistent with the first dampener 20.

In some embodiments, the thermal insulation element 10 includes a first surface 11 and a second surface 12 disposed opposite to each other, and the first buffer element 20 is disposed on the first surface 11. The stacking direction of each battery may be parallel to the first surface 11 and the second surface 12, that is, the first surface 11 and the second surface 12 may not be disposed opposite to the battery, the thickness of the first buffer member 20 in this embodiment may be smaller than that of the heat insulating member 10, and two adjacent batteries may first press the heat insulating member 10 and start to contact with the first buffer member 20 after being pressed to a certain extent during the assembly of the battery pack, thereby forming buffering. The first and

second surfaces

11, 12 in this embodiment may be the circumferential outer surfaces of the insulation 10, for example, the insulation 10 may be a first rectangular structure that may include two opposing major surfaces and four minor surfaces, while the first and

second surfaces

11, 12 in this embodiment may be two of the four minor surfaces.

An embodiment of the present invention also provides a battery pack including the above-described heat insulating structure and at least two cells, each of which has a stacking direction perpendicular to the first surface 11.

The battery pack of one embodiment of the utility model comprises a heat insulation structure and at least two batteries, wherein the heat insulation structure comprises a heat insulation piece 10 and a first buffer piece 20, and the first buffer piece 20 is arranged on the first surface 11 of the heat insulation piece 10, so that when the heat insulation structure is used for assembling the battery pack, the heat insulation piece 10 and the first buffer piece 20 can jointly provide pretightening force for the batteries, the installation effect is ensured, and enough battery expansion space can be reserved for the compressibility of the heat insulation piece 10 and the first buffer piece 20.

And a heat insulation structure can be arranged between two adjacent batteries. The direction in which the respective cells are sequentially arranged forms the stacking direction of the battery pack, i.e., the stacking direction of the respective cells. The stacking direction of each cell is perpendicular to the first surface 11 and the second surface 12, so that the first surface 11 and the second surface 12 of the thermal insulation member 10 can correspond to two adjacent cells, respectively. When the thermal insulation structure includes the first cushion member 20, one battery may be in direct contact with the first cushion member 20, and the other battery may be in direct contact with the thermal insulation member 10. When the heat insulation structure comprises the first buffer member 20 and the second buffer member 30, one battery is directly contacted with the first buffer member 20, the other battery is directly contacted with the second buffer member 30, after the first buffer member 20 and the second buffer member 30 are extruded to a certain compression amount, the two adjacent batteries can be directly contacted with the heat insulation member 10, of course, when the concave part 13 is arranged on the heat insulation member 10, the condition that the batteries do not compress the heat insulation structure is not excluded, the two adjacent batteries can be directly contacted with the heat insulation member 10, and the limitation is not made here.

The battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode can be interchanged. The battery core is arranged in the battery shell, and a certain gap can be formed between the battery core and the battery shell.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixing a plurality of batteries. An insulating structure may be provided between the cells and the end plates.

The battery pack includes a plurality of batteries and a case for fixing the plurality of batteries.

It should be noted that, the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the box body. Wherein, a plurality of batteries can form and install in the box behind the battery module, and at this moment, the battery module can be including the end plate and the curb plate of fixed a plurality of batteries. Or, a plurality of batteries can directly set up in the box, need not to carry out in groups a plurality of batteries promptly, utilize the box to fix a plurality of batteries, at this moment, can get rid of end plate and curb plate.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An insulating structure, comprising:

an insulation (10), the insulation (10) comprising a first surface (11) and a second surface (12) arranged opposite;

a first buffer member (20), wherein the first buffer member (20) is arranged on the first surface (11), and a reserved buffer space (1) is arranged between the circumferential outer edge of the first buffer member (20) and the circumferential outer edge of the heat insulation member (10);

wherein a part of the first buffer (20) can be accommodated in the reserved buffer space (1) when the first buffer (20) extends towards a direction away from the center of the first surface (11).

2. Insulation construction according to claim 1, characterised in that the width of at least a part of the head space (1) is a, 0.5mm ≦ a ≦ 3 mm.

3. -insulating structure according to claim 1, characterized in that said first surface (11) is provided with a recess (13), said first buffer (20) being located inside said recess (13).

4. Insulation structure according to claim 3, characterized in that the insulation element (10) is a bent element to form the recess (13).

5. Insulation construction according to any of claims 1 to 4, characterized in that the surface of the first cushioning element (20) facing away from the insulation element (10) has an area S1 and the first surface (11) has an area S2, wherein S2 is 5% S1 or S1 is 30% S2 or S2 is 5% S1 is 30% S2.

6. The thermal insulation structure according to any one of claims 1 to 4, characterized in that the first cushion member (20) is provided around a circumferential outer edge of the thermal insulation member (10) to be formed with a through hole (21).

7. The insulation structure according to any one of claims 1 to 4, further comprising:

a second cushioning member (30), said second cushioning member (30) being disposed on said second surface (12).

8. The thermal insulation structure according to claim 7, wherein the first cushion member (20) has a thickness of d1, the thermal insulation member (10) has a thickness of d2, and the second cushion member (30) has a thickness of d3, wherein d1 is 0 or more and 2 x d2 is 0 or less and d3 is 2 or more and 2 x d2 is 0 or less.

9. The thermal insulation structure of claim 8, wherein d2 is 2mm or more and 4mm or less.

10. A battery pack, characterized by comprising the thermal insulation structure of any one of claims 1 to 9 and at least two cells, the stacking direction of each of the cells being perpendicular to the first surface (11).