Thermal insulation assembly, battery module and battery pack

Abstract

Disclosed in the present application is a thermal insulation assembly, comprising: a cushioning forming frame, which is of an annular frame structure; an aerogel piece, which is embedded inside the cushioning forming frame; and a release film assembly, which comprises a first release film and a second release film, wherein the aerogel piece is clamped between the first release film and the second release film.

Description

Thermal insulation assembly, battery module and battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024211029746 filed on May 20, 2024 with the China Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of batteries, in particular to a thermal insulation assembly, a battery module and a battery pack. BACKGROUND

[0003] As an excellent thermal insulation material, aerogel is widely used in battery modules at present, and is usually used as a thermal insulation pad between battery cells to effectively reduce the temperature of the battery and improve the efficiency and stability of the energy storage system. TECHNICAL PROBLEM

[0004] The compressibility and resilience of aerogel are not as good as those of foam and silica gel, and some aerogels even have plastic deformation after compression, which cannot rebound, resulting in that the pre-tightening force of the battery module after assembly is too small, which affects the overall assembly size of the battery module and the cycle number of the battery cell. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a thermal insulation assembly, comprising:

[0006] a buffer shaping frame, the buffer shaping frame being a frame structure in a ring shape;

[0007] an aerogel body, the aerogel body being embedded in the interior of the buffer shaping frame;

[0008] a release film assembly, the release film assembly comprising a first release film and a second release film, the aerogel body being sandwiched between the first release film and the second release film.

[0009] In a second aspect, the present application provides a battery module, comprising one or more thermal insulation assemblies described above and one or more battery cell units, and each of two adjacent battery cell units is configured with one thermal insulation assembly.

[0010] In a third aspect, the present application provides a battery pack, comprising the battery module described above. ADVANTAGEOUS EFFECTS

[0011] The aerogel body part is ingeniously constrained in the buffer shaping frame, and is packaged by the first release film and the second release film, so that the aerogel body part can be stably combined into an integral whole with the buffer shaping frame, and under the action of the buffer shaping frame, the deformation amount of the aerogel body part is reduced, the problem that the existing aerogel is deformed after being compressed to cause the pre-tightening force of the battery module to be too small is solved, so that the assembly size of the whole battery module and the cycle number of the battery cell are ensured, the assembly yield of the battery module is improved, and the rework cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is an exploded structural schematic diagram of a heat insulation assembly according to the present application;

[0013] Fig. 2 is a whole structural schematic diagram of a heat insulation assembly according to the present application;

[0014] Fig. 3 is a split structural diagram of a buffer shaping frame and an aerogel body part according to the present application.

[0015] Fig. 1 is an exploded structural schematic diagram of a heat insulation assembly according to the present application; Embodiments of the present application

[0016] Specifically, please refer to Figs. 1 to 3, the present application discloses a heat insulation assembly 1, which comprises a buffer shaping frame 11 and an aerogel body part 12. The buffer shaping frame 11 is a frame structure in a ring shape. The ring shape can be a rectangular ring, or a circular ring, or a ring structure with a design pattern. The aerogel body part 12 is a cuboid. Specifically, the aerogel body part 12 has a first gel surface 121, a second gel surface 122, and a third gel surface 123. The first gel surface 121 is the largest side surface of the aerogel body part 12. The direction perpendicular to the first gel surface 121 is the thickness direction of the aerogel body part 12. The second gel surface 122 is connected to the first gel surface 121 perpendicularly. The first gel surface 121 and the second gel surface 122 are both connected to the third gel surface 123 perpendicularly.

[0017] It can be understood that when the side lengths of the four sides in the first colloid surface 121 are all the same, the area of the second colloid surface 122 is equal to the area of the third colloid surface 123. As shown in FIG. 3, when the first colloid surface 121 is rectangular, the second colloid surface 122 is arranged corresponding to the long side of the first colloid surface 121, and the third colloid surface 123 is arranged corresponding to the short side of the first colloid surface 121, then the area of the second colloid surface 122 is larger than the area of the third colloid surface 123.

[0018] In some embodiments, as shown in FIG. 3, the buffer and shaping frame 11 has a buffer contact surface 1, a shaping frame inner cavity 114, and a first inner abutting surface 111 and a second inner abutting surface 112 provided in the shaping frame inner cavity 114. Among them, the buffer contact surface 113 is the side surface of the buffer and shaping frame 11 in a zigzag shape, and the direction perpendicular to the buffer contact surface 113 is the thickness direction of the buffer and shaping frame 11. The first inner abutting surface 111 is used to abut and contact the third colloid surface 123, and the second inner abutting surface 112 is used to abut and contact the second colloid surface 122.

[0019] In some embodiments, the aerogel body member 12 is embedded in the shaping frame inner cavity 114 of the buffer and shaping frame 11. In some embodiments, the first inner abutting surface 111 of the buffer and shaping frame 11 abuts and contacts the third colloid surface 123 of the aerogel body member 12, and the second inner abutting surface 112 of the buffer and shaping frame 11 abuts and contacts the second colloid surface 122 of the aerogel body member 12. Of course, it can also be that only the first inner abutting surface 111 of the buffer and shaping frame 11 abuts and contacts the third colloid surface 123 of the aerogel body member 12, or it can also be that only the second inner abutting surface 112 of the buffer and shaping frame 11 abuts and contacts the second colloid surface 122 of the aerogel body member 12, and the aerogel body member 12 is embedded and fixed inside the buffer and shaping frame 11.

[0020] It should be noted that the first inner abutting surface 111 of the buffer and shaping frame 11 can also be adhesively fixed to the third colloid surface 123 of the aerogel body member 12 through a flame-retardant double-sided adhesive, and the second inner abutting surface 112 of the buffer and shaping frame 11 can also be adhesively fixed to the second colloid surface 122 of the aerogel body member 12 through a flame-retardant double-sided adhesive, so as to better ensure the stability of the assembly between the buffer and shaping frame 11 and the aerogel body member 12.

[0021] It should also be noted that the above-mentioned buffer and shaping frame 11 is a frame structure made of a buffer material. The buffer material can be selected as silica gel or foam. When the heat insulation component 1 is assembled between two adjacent battery cell components, the buffer and shaping frame 11 of the heat insulation component 1 can be stressed and buffer its acting force and / or impact force.

[0022] Unexpectedly, when the adjacent two battery cell elements both generate extrusion force on the thermal insulation assembly 1, the buffer shaping frame 11 can prevent the aerogel body 12 from generating excessive deformation by using the good resilience characteristics of the buffer shaping frame 11, and make the aerogel body 12 maintain a relatively small and relatively stable deformation. At the same time, part of the force of the battery cell element is applied to the buffer contact surface 113 of the buffer shaping frame 11, that is, during assembly, the large surface of the battery cell element mainly acts on the buffer contact surface 113 of the buffer shaping frame 11, thereby reducing the deformation of the aerogel body 12, so that the overall thermal insulation assembly 1 will not generate excessive deformation and plastic deformation, avoiding the problem that the pre-tightening force of the thermal insulation assembly 1 assembled in the battery module is too small, and ensuring the overall assembly size of the battery module and the cycle number of the battery cell.

[0023] In some embodiments, the first thickness of the aerogel body 12 in the original state is smaller than the shaping thickness of the buffer shaping frame 11 in the compressed deformation state. Here, the original state refers to the state of the aerogel body 12 under no force and maintaining the original shape, that is, after the thermal insulation assembly 1 is assembled into the battery module and the pre-tightening force is applied, the first thickness of the aerogel body 12 is thinner than the shaping thickness of the buffer shaping frame 11. At this time, the aerogel body 12 does not generate compression deformation, thereby further reducing the deformation amount of the aerogel body 12 under extrusion force, thereby ensuring that the aerogel body 12 does not affect the compression of the buffer shaping frame 11 during use of the thermal insulation assembly 1, effectively ensuring the use stability of the thermal insulation assembly 1.

[0024] In some embodiments, the second thickness of the aerogel body 12 in the original state is smaller than the original thickness of the buffer shaping frame 11 in the deformation recovery state. The original state refers to the state of the aerogel body 12 under no force and maintaining the original shape. That is, before the thermal insulation assembly 1 is assembled into the battery module, or when the thermal insulation assembly 1 is in a raw material state, the second thickness of the aerogel body 12 is smaller than the original thickness of the buffer shaping frame 11. In this way, the aerogel body 12 will not deform during assembly, and the use stability of the thermal insulation assembly 1 can also be ensured, that is, the aerogel body 12 does not affect the compression of the buffer shaping frame 11 during use of the thermal insulation assembly 1, effectively ensuring the use stability of the thermal insulation assembly 1.

[0025] In some embodiments, as shown in FIG. 1 and FIG. 2, the thermal insulation assembly 1 further comprises a release film assembly 13, wherein the release film assembly 13 comprises a first release film 131 and a second release film 132, and the aerogel body 12 is sandwiched between the first release film 131 and the second release film 132. That is, the first release film 131 and the second release film 132 are used to encapsulate the buffer shaping frame 11 and the aerogel body 12, and the air between the first release film 131 and the aerogel body 12, the air between the second release film 132 and the aerogel body 12, the air between the first release film 131 and the buffer shaping frame 11, and the air between the second release film 132 and the buffer shaping frame 11 are removed during the encapsulation process, so as to ensure that the buffer shaping frame 11 and the aerogel body 12 are more closely attached.

[0026] In some embodiments, as shown in FIG. 1 and FIG. 2, the thermal insulation assembly 1 further comprises a first fire-retardant adhesive 141 and a second fire-retardant adhesive 142, wherein the first fire-retardant adhesive 141 and the second fire-retardant adhesive 142 are fire-retardant double-sided adhesive layers. The first fire-retardant adhesive 141 covers the buffer shaping frame 11 and the aerogel body 12, and the buffer shaping frame 11 and the aerogel body 12 are adhered to the first release film 131 through the first fire-retardant adhesive 141. The second fire-retardant adhesive 142 covers the buffer shaping frame 11 and the aerogel body 12, and the buffer shaping frame 11 and the aerogel body 12 are adhered to the second release film 132 through the second fire-retardant adhesive 142.

[0027] In some embodiments, the first fire-retardant adhesive 141 only covers the buffer shaping frame 11, and the first release film 131 is adhered to the buffer shaping frame 11 through the first fire-retardant adhesive 141. The second fire-retardant adhesive 142 only covers the buffer shaping frame 11, and the second release film 132 is adhered to the buffer shaping frame 11 through the second fire-retardant adhesive 142.

[0028] In some embodiments, the first fire-retardant adhesive 141 only covers the aerogel body 12, and the first release film 131 is adhered to the aerogel body 12 through the first fire-retardant adhesive 141. The second fire-retardant adhesive 142 only covers the aerogel body 12, and the second release film 132 is adhered to the aerogel body 12 through the second fire-retardant adhesive 142.

[0029] In this way, when the first fire-retardant adhesive 141 is located within the coverage range of the first release film 131 and the second fire-retardant adhesive 142 is located within the coverage range of the second release film 132, the first release film 131 can ensure the effectiveness of the fire-retardant double-sided adhesive between the first fire-retardant adhesive 141, the buffer shaping frame 11 and the aerogel body 12, and can also ensure the cleanliness of the side of the buffer shaping frame 11 and the aerogel body 12 close to the first release film 131. The second release film 132 can ensure the effectiveness of the fire-retardant double-sided adhesive between the second fire-retardant adhesive 142, the buffer shaping frame 11 and the aerogel body 12, and can also ensure the cleanliness of the side of the buffer shaping frame 11 and the aerogel body 12 close to the second release film 132.

[0030] The unexpected effect is that the cooperation between the first release film 131 and the second release film 132 of the release film assembly 13 can further stably fix the aerogel body 12 inside the buffer shaping frame 11, avoid the problem of the aerogel body 12 from the buffer shaping frame 11, and shape the aerogel body 12 in the buffer shaping frame 11 to prevent the aerogel body 12 from deforming before or during the installation of the battery module. In addition, after the first release film 131 and the second release film 132 are torn off, the stable combination between the aerogel body 12 and the buffer shaping frame 11 can also be achieved under the action of the first fire-retardant glue 141 and the second fire-retardant glue 142.

[0031] In use, the release film assembly 13 needs to be peeled off from the buffer shaping frame 11 and the aerogel body 12, and the battery surface of the cell unit directly acts on the buffer shaping frame 11 and the aerogel body 12. Optionally, the first fire-retardant glue 141 of the thermal insulation assembly 1 is bonded with the battery surface of one cell unit, and the second fire-retardant glue 142 of the thermal insulation assembly 1 is bonded with the battery surface of another cell unit, so that the thermal insulation assembly 1 is not easy to be separated from the battery module, and the compactness of the battery module assembly is ensured, and the thermal spread of the cell unit in the thermal runaway state can also be effectively blocked.

[0032] In some embodiments, as shown in FIGS. 1 and 2, the first film ear 133 is protruded and formed on the first release film 131 towards the outside of the buffer shaping frame 11, and the second film ear 134 is protruded and formed on the second release film 132 towards the outside of the buffer shaping frame 11.

[0033] In some embodiments, the first film ear 133 is integrally formed with the first release film 131, and the first film ear 133 can also be attached to the first release film 131; in some embodiments, the second film ear 134 is preferably integrally formed with the second release film 132, and the second film ear 134 can also be attached to the second release film 132.

[0034] In this way, the first release film 131 is peeled off under the action of the first film ear 133. The second release film 132 is peeled off under the action of the second film ear 134.

[0035] Based on the structure and connection relationship of the heat insulation assembly 1, the inventor also discloses a battery module, which comprises one or more heat insulation assemblies 1 and one or more battery cell units, and each of the adjacent two battery cell units is provided with a heat insulation assembly 1. At this time, the aerogel body 12 of the heat insulation assembly 1 can effectively insulate the heat conduction between the adjacent two battery cell units, and the buffer shaping frame 11 of the heat insulation assembly 1 can accept the force of the adjacent two battery cell units during assembly and reduce the force of the aerogel body 12, thereby well ensuring the pre-tightening force of the whole battery module.

[0036] Among them, the heat insulation assembly 1 tears off the release film assembly 13 during assembly and use, so that the battery cell unit is bonded with the first fire-retardant glue 141 of the heat insulation assembly 1, and at the same time, the battery cell unit is bonded with the second fire-retardant glue 142 of the heat insulation assembly 1. By using the first fire-retardant glue 141 and the second fire-retardant glue 142 of the heat insulation assembly 1, not only the safety of the battery module can be effectively ensured, but also the firmness of the whole assembly of the battery module is improved.

[0037] In addition, based on the above-mentioned battery module, the inventor also discloses a battery pack comprising the above-mentioned battery module.

Claims

1. A thermal insulation assembly (1), comprising: a cushioning frame (11) which is a frame structure in a ring shape; an aerogel body (12) embedded in the interior of the cushioning frame (11); a release film assembly (13) comprising a first release film (131) and a second release film (132), the aerogel body (12) being sandwiched between the first release film (131) and the second release film (132).

2. The thermal insulation assembly (1) according to claim 1, further comprising a first fire-retardant glue (141) and a second fire-retardant glue (142), the cushioning frame (11) and / or the aerogel body (12) being adhered to the first release film (131) by the first fire-retardant glue (141), and the cushioning frame (11) and / or the aerogel body (12) being adhered to the second release film (132) by the second fire-retardant glue (142).

3. A thermal insulation assembly (1) according to claim 2, wherein: The first fire-retardant glue (141) is located within the coverage of the first release film (131), and the second fire-retardant glue (142) is located within the coverage of the second release film (132).

4. A thermal insulation assembly (1) according to claim 1 or 2 or 3, wherein: A first film lug (133) is protruded and formed on the first release film (131) towards the outside of the cushioning frame (11).

5. A thermal insulation assembly (1) according to claim 1 or 2 or 3, wherein: A second film lug (134) is protruded and formed on the second release film (132) towards the outside of the cushioning frame (11).

6. A thermal insulation assembly (1) according to claim 1, wherein: A first thickness of the aerogel body (12) in an original state is less than a set thickness of the cushioning frame (11) in a compressed deformed state, the original state being a state in which the aerogel body (12) is not under stress and keeps its original shape.

7. A thermal insulation assembly (1) according to claim 1, wherein: A second thickness of the aerogel body (12) in an original state is less than an original thickness of the cushioning frame (11) in a deformed recovery state, the original state being a state in which the aerogel body (12) is not under stress and keeps its original shape.

8. A thermal insulation assembly (1) according to claim 1 or 2 or 3 or 6 or 7, wherein: The cushioning frame (11) is a frame structure made of silica gel or foam.

9. A battery module, comprising: one or more thermal insulation assemblies (1) according to any one of claims 1 to 8; one or more cell unit elements, each of which is configured with one of the thermal insulation assemblies (1) between two adjacent cell unit elements.

10. A battery pack comprising the battery module according to claim 9.

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