Aerogel packaging heat insulation structure for cylindrical battery cell

Abstract

The utility model discloses an aerogel packaging heat insulation structure for a cylindrical battery cell, which comprises at least one bendable heat insulation sheet, the bendable heat insulation sheet is bent and spliced into a heat insulation barrel, and a double faced adhesive tape is arranged on the inner end face of the heat insulation barrel; the bendable heat insulation sheet comprises a bendable aerogel heat insulation core material and a thermoplastic elastomer packaging film, and the bendable aerogel heat insulation core material is packaged by the thermoplastic elastomer packaging film. The bendable heat-insulating sheet is bent and spliced into a heat-insulating cylinder according to the size of the cylindrical battery cell, the heat-insulating cylinder is sleeved on the battery cell to insulate heat of the battery cell, and the double faced adhesive tape can ensure that the heat-insulating cylinder is in close contact with the battery cell. The safety performance is high, a solution is provided for improving the energy density of the subsequent cylindrical battery cell, and the risk caused by thermal runaway of the cylindrical battery cell is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery core thermal insulation, and in particular relates to an aerogel packaging thermal insulation structure for a cylindrical battery core. Background Art

[0002] With the continuous development of the new energy industry, there are more and more types of battery cells, including square battery cells, blade battery cells, soft-pack battery cells, and cylindrical battery cells. Regardless of the battery cell structure, thermal runaway management of the battery cell is an issue that needs to be focused on and solved, affecting personal and property safety. At present, aerogel encapsulation insulation pads are mainly used between square battery cells and blade battery cells, and in actual cases and market feedback information, it can be clearly shown that aerogel materials play a very important role in thermal runaway management of battery cells.

[0003] Cylindrical cells also occupy a certain market share in some leading new energy vehicle companies, such as the mainstream 2170 cylindrical cells and the 4680 and 4690 large cylindrical cells that are gradually put into mass production. The energy density of small cylindrical cells is relatively low, and the mass-produced cell PACKs on the market basically use a simple water cooling system to prevent thermal runaway. However, as the size of cylindrical cells continues to expand, the 4680 / 4690 large cylindrical cells have been gradually put into mass production and put into the market. As the size of cylindrical cells continues to increase, the energy density of the single cells gradually increases, so the improvement of battery PACK thermal runaway management technology is crucial. Utility Model Content

[0004] The utility model provides an aerogel packaging heat insulation structure for cylindrical battery cores. Aerogel heat insulation material is used to sheath heat insulation on a single cylindrical battery core, and the utility model can be applicable to cylindrical battery cores with different energy densities.

[0005] The technical solution adopted by the utility model is:

[0006] An aerogel encapsulation heat insulation structure for cylindrical battery cores includes at least one bendable heat insulation sheet, which is bent and assembled into a heat insulation tube, and a double-sided adhesive tape is provided on the inner end surface of the heat insulation tube; the bendable heat insulation sheet includes a bendable aerogel heat insulation core material and a thermoplastic elastomer encapsulation film, and the thermoplastic elastomer encapsulation film encapsulates the bendable aerogel heat insulation core material. The bendable heat insulation sheet is bent and assembled into a heat insulation tube according to the size of the cylindrical battery core, and is sleeved on the battery core to insulate the battery core, and the double-sided adhesive tape can ensure that the heat insulation tube is in close contact with the battery core.

[0007] As a preferred solution of the utility model, the heat-insulating tube comprises a bendable heat-insulating sheet, and two spliced ​​side edges of the bendable heat-insulating sheet are spliced ​​and connected.

[0008] As a preferred solution of the utility model, the heat-insulating tube comprises at least two bendable heat-insulating sheets, and the spliced ​​sides of the bendable heat-insulating sheets are spliced ​​and connected in sequence.

[0009] As a preferred solution of the utility model, whether it is a one-piece or multi-piece structure, the two spliced ​​sides overlap and the overlapping parts of the spliced ​​sides are connected by an adhesive layer. Glue is applied to the overlapping area to prevent warping at the spliced ​​part.

[0010] As a preferred solution of the utility model, the two joining sides are aligned and joined, and a single-sided adhesive tape is provided at the joining position.

[0011] As a preferred solution of the utility model, the spliced ​​side is provided with a concave-convex interface, the two spliced ​​side edges are spliced ​​together by concave-convex bite, and a single-sided adhesive is set at the splicing position. The staggered concave-convex splicing can perfectly seam the edges of the spliced ​​side, better avoid warping, improve the stability of the insulation tube shape, and maximize the original design of the battery PACK.

[0012] As a preferred solution of the utility model, a buffer is provided around the bendable aerogel insulation core material, and the bendable aerogel insulation core material and the buffer are encapsulated by a thermoplastic elastomer packaging film.

[0013] As a preferred embodiment of the present invention, the buffer is a highly elastic foam buffer, and the buffer is a buffer frame or a buffer strip. The buffer has good bendability, ensuring that the product as a whole has excellent bendability, and can be a buffer frame or a buffer strip, and the buffer strip is placed along the periphery of the bendable aerogel insulation core material. Generally, it is made of materials such as MPP, PU foam, TPEE foam, and XPP.

[0014] As a preferred embodiment of the utility model, the thermoplastic elastomer packaging film is any one of TPU film, TPO film, TPS film, TPEE film and TPA film. The thermoplastic elastomer packaging film has good tensile strength and excellent elongation at break, which can ensure the flexibility of the bendable aerogel insulation core material, so that the product has good anti-bending performance and meets the use scenario of cylindrical battery cells.

[0015] The bendable aerogel insulation core material is a composite aerogel material with a bendable substrate. The advantage is that it has good bending resistance and can meet the circular usage of cylindrical batteries. The aerogel can be silica aerogel or polyimide aerogel, and the bendable substrate can be ceramic fiber, polyacrylonitrile, melamine foam, CR foam, BR foam, EVA foam and other substrates.

[0016] As a preferred solution of the utility model, the minimum peel strength of the interface between the double-sided adhesive and the blue film is ≥20N / 25mm, and the use width is between 5mm-10mm, so that the product has sufficient adhesion to ensure that the thermal insulation structure can fit tightly on the cylindrical battery core.

[0017] The thermal insulation tubes of the utility model are elastic, so that the thermal insulation structure has excellent bendability and can be well adapted to cylindrical battery cells, providing a better solution for the thermal runaway management of cylindrical battery cells, having high safety performance, and also providing a solution for improving the energy density of subsequent cylindrical battery cells, thereby reducing the risk of thermal runaway of cylindrical battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The present invention is a schematic structural diagram of a bendable heat-insulating sheet provided with a concave-convex interface.

[0020] Figure 2 for Figure 1 AA section view.

[0021] Figure 3 for Figure 2 A partial enlarged view of part B.

[0022] Figure 4 The present invention is a schematic structural diagram of a bendable heat-insulating sheet provided with another concave-convex interface. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1:

[0025] An aerogel packaging insulation structure for cylindrical battery cores, such as Figure 1As shown, it includes a bendable insulation sheet 1, which is bent and assembled into an insulation tube, and a double-sided tape 2 is provided on the inner end surface of the insulation tube; the double-sided tape is a high-performance double-sided tape, and the minimum peeling strength of the interface between the double-sided tape and the blue film is ≥20N / 25mm, and the use width is between 5mm-10mm, so that the product can have sufficient adhesion to ensure that the insulation structure can fit tightly on the cylindrical battery cell.

[0026] The bendable thermal insulation sheet comprises a bendable aerogel thermal insulation core material 3 and a thermoplastic elastomer packaging film 4, and the thermoplastic elastomer packaging film encapsulates the bendable aerogel thermal insulation core material. The bendable thermal insulation sheet is bent and assembled into a thermal insulation tube according to the size of the cylindrical battery cell, and is sleeved on the battery cell to insulate the battery cell. The double-sided adhesive tape can ensure that the thermal insulation tube is in close contact with the battery cell.

[0027] In order to improve the overall buffer elastic performance, a buffer 5 is provided around the bendable aerogel insulation core material, and the thermoplastic elastomer packaging film encapsulates the bendable aerogel insulation core material and the buffer. The buffer is a high elastic foam buffer, and the buffer is a buffer frame or a buffer strip. When the buffer frame is used, the bendable aerogel insulation core material is placed in the core material placement cavity of the buffer frame, and then encapsulated with a thermoplastic elastomer packaging film; when the buffer strip is used, it is placed around the bendable aerogel insulation core material, and then encapsulated with a thermoplastic elastomer packaging film.

[0028] In addition, the buffer parts used have good bendability to ensure that the product as a whole has excellent bendability. They are generally made of MPP, PU foam, TPEE foam, XPP and other materials.

[0029] The thermoplastic elastomer packaging film has good tensile strength and excellent elongation at break, which can ensure the flexibility of the bendable aerogel insulation core material, so that the product has good bending resistance and meets the use scenarios of cylindrical batteries. It is usually any one of TPU film, TPO film, TPS film, TPEE film and TPA film.

[0030] The bendable aerogel insulation core material is a composite aerogel material with a bendable substrate. Its advantage is that it has good bending resistance and can meet the circular usage of cylindrical batteries. The aerogel can be silica aerogel or polyimide aerogel, and the bendable substrate can be ceramic fiber, polyacrylonitrile, melamine foam, CR foam, BR foam, EVA foam and other substrates.

[0031] For the spliced ​​insulation tube, two spliced ​​sides of a bendable insulation sheet are spliced ​​and connected, and the position of the splicing can be either overlapping splicing or aligned jointing. When overlapping splicing, glue is applied to the overlapping area to ensure that the splicing will not warp; when aligned jointing, concave and convex interfaces of different shapes can be set on the splicing sides, and the two splicing sides are bitten and aligned through matching concave and convex interfaces, and then single-sided tape 6 is used to bond at the splicing to ensure that the appearance of the insulation tube is stable.

[0032] This embodiment is demonstrated by taking the concave-convex structure of the spliced ​​side as an example. Figure 1-3 As shown, a protrusion is set in the middle of one spliced ​​side, and a groove is correspondingly set in the middle of the other spliced ​​side. When splicing, the protrusion is transferred to the groove, and the splicing side outside the protrusion is aligned one by one with the splicing side outside the groove; then a single-sided tape is set at the protrusion and outside the groove, and the single-sided tape is used to stick them together after splicing.

[0033] like Figure 4 As shown, a protrusion is set at the lower part of one spliced ​​side, and a protrusion is set at the upper part of the other spliced ​​side, so that each spliced ​​side has a convex and concave structure, the splicing concave and convex of the two spliced ​​sides correspond to each other, and single-sided tape is used to bond them at the splicing position.

[0034] Embodiment 2:

[0035] A thermal insulation structure for aerogel packaging of cylindrical battery cores, wherein the thermal insulation tube comprises at least two bendable thermal insulation sheets, and the spliced ​​sides of the bendable thermal insulation sheets are spliced ​​and connected in sequence, and the rest are the same as in Example 1.

[0036] In the description of this specification, the description of reference terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An aerogel packaging insulation structure for cylindrical battery core, characterized in that: It comprises at least one bendable thermal insulation sheet, which is bent and assembled into a thermal insulation tube, and a double-sided adhesive is provided on the inner end surface of the thermal insulation tube; the bendable thermal insulation sheet comprises a bendable aerogel thermal insulation core material and a thermoplastic elastomer packaging film, and the thermoplastic elastomer packaging film packages the bendable aerogel thermal insulation core material.

2. The aerogel packaging insulation structure for cylindrical battery cells according to claim 1, characterized in that: The heat-insulating cylinder comprises a bendable heat-insulating sheet, and two spliced ​​side edges of the bendable heat-insulating sheet are spliced ​​and connected.

3. The aerogel packaging and heat insulation structure for cylindrical battery core according to claim 1, characterized in that: The heat-insulating cylinder comprises at least two bendable heat-insulating sheets, and the spliced ​​sides of the bendable heat-insulating sheets are spliced ​​and connected in sequence.

4. The aerogel packaging insulation structure for cylindrical battery core according to claim 2 or 3, characterized in that: The two joined sides are overlapped and joined, and the overlapping parts of the joined sides are connected by an adhesive layer.

5. The aerogel packaging insulation structure for cylindrical battery core according to claim 2 or 3, characterized in that: The two joint sides are aligned and jointed and a single-sided tape is set on the joint.

6. The aerogel packaging and heat insulation structure for cylindrical battery core according to claim 5, characterized in that: The splicing side is provided with a concave-convex interface, the two splicing side edges are spliced ​​together by concave-convex bite, and a single-sided adhesive tape is arranged at the splicing position.

7. The aerogel packaging insulation structure for cylindrical battery core according to any one of claims 1 to 3, characterized in that: A buffer is arranged around the bendable aerogel heat-insulating core material, and a thermoplastic elastomer packaging film packages the bendable aerogel heat-insulating core material and the buffer.

8. The aerogel packaging and heat insulation structure for cylindrical battery core according to claim 7, characterized in that: The buffer component is a high-elasticity foam buffer component, and the buffer component is a buffer frame or a buffer strip.

9. The aerogel packaging insulation structure for cylindrical battery core according to any one of claims 1 to 3, characterized in that: The thermoplastic elastomer packaging film is any one of a TPU film, a TPO film, a TPS film, a TPEE film and a TPA film.

10. The aerogel packaging insulation structure for cylindrical battery core according to any one of claims 1 to 3, characterized in that: The minimum peeling strength of the interface between the double-sided adhesive tape and the blue film is ≥20N / 25mm, and the use width is between 5mm-10mm.

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