Heat insulation pad, battery pack and vehicle

Abstract

The utility model discloses a heat insulation pad, a battery pack and a vehicle, the heat insulation pad comprises a heat insulation elastic sheet and a heat insulation sheet, the heat insulation elastic sheet can generate elastic deformation in the thickness direction so as to provide a buffer function for the heat insulation pad, the heat insulation sheet is attached to at least one side of the heat insulation elastic sheet in the thickness direction, and the heat insulation sheet is attached to the other side of the heat insulation elastic sheet in the thickness direction. Therefore, a heat insulation function is provided for the heat insulation pad. Due to the fact that the heat insulation sheet is attached to the heat insulation elastic sheet, and the heat insulation elastic sheet has a certain heat insulation effect, when the battery cell is in thermal runaway, heat generated by the battery cell can be subjected to primary heat insulation through the heat insulation elastic sheet, and the heat insulation sheet can be subjected to secondary heat insulation, and therefore the heat insulation pad has a two-stage heat insulation effect. Compared with the prior art that one-stage heat insulation is carried out only through a heat insulation core, heat transfer between two adjacent battery cells can be greatly reduced or even avoided, and the heat insulation effect of the heat insulation pad is improved.

Description

Technical Field

[0001] The present application relates to the field of thermal insulation technology, and in particular to a battery cell thermal insulation pad, a battery pack and a vehicle. Background Art

[0002] For new energy vehicles, the safety of the battery pack is of paramount importance. At present, in order to improve the thermal safety of the battery pack, thermal insulation pads are installed between adjacent battery cells to delay the spread of heat during thermal runaway of the battery cells. In addition, since the battery cells will expand and contract during the charge and discharge cycle, the thermal insulation pads must also have a buffering function.

[0003] In the related art, a rubber frame is arranged in the circumferential direction of the thermal insulation sheet to enable the thermal insulation pad to be elastically deformed in the thickness direction. The two opposite surfaces of two adjacent battery cells need to reserve a certain extrusion area for the rubber frame. This results in the thermal insulation sheet only covering a part of the two opposite surfaces of the two adjacent battery cells, resulting in poor thermal insulation effect of the thermal insulation pad. Utility Model Content

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present disclosure provides a thermal insulation pad with good thermal insulation effect, the present disclosure also provides a battery pack to improve the thermal insulation effect of the thermal insulation pad of the battery cell, and the present disclosure also provides a vehicle to improve the thermal insulation effect of the thermal insulation pad of the battery cell in the battery pack.

[0005] The thermal insulation pad disclosed in the present invention comprises a thermal insulation elastic sheet and a thermal insulation sheet, wherein the thermal insulation elastic sheet can undergo elastic deformation in the thickness direction thereof to provide a buffering function for the thermal insulation pad; the thermal insulation sheet is attached to at least one side of the thermal insulation elastic sheet in the thickness direction thereof to provide a thermal insulation function for the thermal insulation pad.

[0006] In some embodiments, a support sheet is provided between the thermal insulation elastic sheet and the thermal insulation sheet, and the support sheet is respectively attached to the thermal insulation elastic sheet and the thermal insulation sheet, and the support sheet is used to support the thermal insulation sheet and the thermal insulation elastic sheet.

[0007] In some embodiments, the thermal insulation sheet is made of mica or ceramic silicone rubber.

[0008] In some embodiments, the thickness of the thermal insulation sheet is less than or equal to 0.2 mm.

[0009] In some embodiments, the support sheet is made of fiber material.

[0010] In some embodiments, the thickness of the support sheet is 0.1 mm-0.2 mm.

[0011] In some embodiments, the heat insulating elastic sheet is made by foaming foam.

[0012] In some embodiments, the thickness of the thermal insulation elastic sheet is 3 mm-4 mm.

[0013] The battery pack disclosed herein comprises a thermal insulation pad and a plurality of battery cells, wherein the thermal insulation pad is the thermal insulation pad described in any of the above embodiments; and the thermal insulation pad is arranged between two adjacent battery cells.

[0014] The vehicle disclosed herein comprises the battery pack described in any one of the above embodiments.

[0015] When the thermal insulation pad of the present invention is in use, since the thermal insulation sheet is fitted on the thermal insulation elastic sheet, when the thermal insulation pad is installed between the two opposite surfaces of two battery cells, the thermal insulation sheet can completely cover the two opposite surfaces of two adjacent battery cells, thereby improving the thermal insulation effect of the thermal insulation pad. In addition, the thermal insulation elastic sheet also has a certain thermal insulation effect, and the thermal insulation pad can be used for secondary thermal insulation through the thermal insulation elastic sheet and the thermal insulation sheet, so that the thermal insulation pad of the embodiment of the utility model has a two-stage thermal insulation effect, further improving the thermal insulation effect of the thermal insulation pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the installation of the thermal insulation pad of the embodiment of the utility model.

[0017] Figure 2 It is a schematic structural diagram of a heat insulation pad according to an embodiment of the utility model.

[0018] Reference numerals:

[0019] 100. thermal insulation pad; 200. battery cell; 1. thermal insulation elastic sheet; 2. thermal insulation sheet; 3. supporting sheet. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0021] The battery pack of the embodiment of the utility model comprises a heat insulating pad 100 and a plurality of battery cells 200, wherein a heat insulating pad 100 is arranged between two adjacent battery cells 200. The technical solution of the heat insulating pad 100 of the present application is described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 As shown, the thermal insulation pad 100 of the embodiment of the utility model comprises a thermal insulation elastic sheet 1 and a thermal insulation sheet 2. The thermal insulation elastic sheet 1 can undergo elastic deformation in the thickness direction, and the thermal insulation elastic sheet 1 is used to provide a buffer function for the thermal insulation pad 100; the thermal insulation sheet 2 is attached to at least one side of the thermal insulation elastic sheet 1 in the thickness direction, and the thermal insulation sheet 2 is used to provide a thermal insulation function for the thermal insulation pad 100.

[0023] The heat insulating sheet 2 is attached to at least one side of the heat insulating elastic sheet 1 in the thickness direction. It can be understood that the heat insulating elastic sheet 1 is provided with the heat insulating sheet 2 on one side in the thickness direction, or the heat insulating elastic sheet 1 is provided with the heat insulating sheet 2 on both sides in the thickness direction (such as Figure 2 As shown), the heat insulating sheet 2 can be bonded, hot pressed or cold pressed on the heat insulating elastic sheet 1.

[0024] When the thermal insulation pad 100 of the embodiment of the utility model is used, the thermal insulation pad 100 is arranged between two opposite surfaces of two adjacent battery cells 200. Since the thermal insulation elastic sheet 1 can undergo elastic deformation in the thickness direction, the thermal insulation pad 10 has a buffering function, providing a buffer space for the battery cells 200 during the charge and discharge cycle to facilitate the expansion and contraction of the battery cells 200. When the battery cells 200 are in thermal runaway, the heat between the two adjacent battery cells 200 is insulated by the thermal insulation sheet 2 to avoid heat transfer between the battery cells 200, resulting in further diffusion of the heat of the battery cells 200, thereby ensuring the thermal safety of the battery pack.

[0025] Since the heat insulating sheet 2 is fitted on the heat insulating elastic sheet 1, when the heat insulating pad 100 is installed between the two opposite surfaces of two battery cells, the heat insulating sheet 2 can completely cover the two opposite surfaces of two adjacent battery cells, thereby improving the heat insulating effect of the heat insulating pad 100. In addition, the heat insulating elastic sheet 1 also has a certain heat insulating effect, and the heat insulating pad 100 can perform secondary heat insulation through the heat insulating elastic sheet 1 and the heat insulating sheet 2, so that the heat insulating pad 100 of the embodiment of the utility model has a two-stage heat insulating effect, further improving the heat insulating effect of the heat insulating pad 100.

[0026] Therefore, the thermal insulation pad 100 of the embodiment of the utility model has the advantages of good thermal insulation effect and the like.

[0027] Therefore, the battery pack of the embodiment of the utility model has the advantage of high thermal safety performance.

[0028] In some embodiments, a support sheet 3 is provided between the thermal insulation elastic sheet 1 and the thermal insulation sheet 2, and the support sheet 3 is respectively attached to the thermal insulation elastic sheet 1 and the thermal insulation sheet 2, and the support sheet 3 is used to support the thermal insulation sheet 2 and the thermal insulation elastic sheet 1 to enhance the overall strength of the thermal insulation pad 100. When the battery cell 200 expands due to thermal runaway, the strength of the support sheet 3 can ensure that the thermal insulation elastic sheet 1 and the thermal insulation sheet 2 will not be damaged under the impact of heat and expansion pressure, thereby ensuring the integrity of the thermal insulation pad 100.

[0029] Optionally, the heat insulating sheet 2 is made of mica or ceramic silicone rubber. It is understandable that the temperature resistance of mica or ceramic silicone rubber exceeds 1000°C. When the battery cell 200 has thermal runaway, the heat insulating sheet 2 can directly face the heat source and play a role in isolating part of the heat, reducing the maximum temperature of the hot surface of the battery cell 200 of 700°C to 800°C to a range that the heat insulating elastic sheet 1 can withstand.

[0030] Optionally, the thickness of the thermal insulation sheet 2 is less than or equal to 0.2 mm, for example, 0.2 mm or 0.1 mm, and the thickness of the thermal insulation sheet 2 is set as thin as possible while ensuring that the thermal insulation sheet 2 can meet the thermal insulation function, so as to reduce the overall thickness of the thermal insulation pad 100 and improve the space utilization of the battery pack.

[0031] In some embodiments, the support sheet 3 is made of fiber material. For example, the support sheet 3 can be made of continuous fiber material, such as glass fiber, basalt fiber, etc., which has high strength and plays a role in enhancing the overall strength.

[0032] Optionally, the thickness of the support sheet 3 is 0.1 mm-0.2 mm. For example, the thickness of the support sheet 3 is 0.1 mm, 0.15 mm or 0.2 mm. While ensuring that the support sheet 3 can meet the supporting function, the thickness of the support sheet 3 is set as thin as possible to reduce the overall thickness of the thermal insulation pad 100 and improve the space utilization of the battery pack.

[0033] In some embodiments, the heat insulating elastic sheet 1 is made of foam. For example, the heat insulating elastic sheet 1 is made of polyurethane foam or polypropylene foam. The foam density and compression rebound curve can be adjusted by adjusting the foam components and foaming process to match the preload force required for grouping the battery cells 200 and the expansion force of the battery cells 200 after charge and discharge cycles. The foam also has good heat insulation performance, especially ceramic silicon foam with added ceramic fibers.

[0034] Optionally, the thickness of the thermal insulation elastic sheet 1 is 3mm-4mm. For example, the thickness of the thermal insulation elastic sheet 1 is 3mm, 3.5mm or 4mm. While ensuring that the elasticity of the thermal insulation elastic sheet 1 can meet the expansion function of the battery cell 200, the thickness of the thermal insulation elastic sheet 1 is set as thin as possible to reduce the overall thickness of the thermal insulation pad 100 and improve the space utilization of the battery pack.

[0035] In terms of production process, the constituent materials of the thermal insulation pad 100 of the embodiment of the utility model are all commonly used materials. The thermal insulation sheet 2 and the support sheet 3 can be composited, and the thermal insulation elastic sheet 1 uses the composite-molded thermal insulation sheet 2 and the support sheet 3 as a base material for foaming during the foaming process. They are directly composited into one during the foaming process, saving subsequent bonding and assembly steps. The overall production does not require complex and high-energy consumption steps such as sol-gel and hot pressing with relatively expensive material costs, so as to reduce the manufacturing cost of the thermal insulation pad 100.

[0036] Therefore, the thermal insulation pad 100 of the embodiment of the utility model is composited with three types of materials, namely, a thermal insulation elastic sheet 1, a thermal insulation sheet 2 and a support sheet 3. It not only has good thermal insulation effect, but also is easy to prepare materials, and has lower raw material costs than silicone rubber and aerogel. In addition, the production process of the thermal insulation pad 100 consumes less energy than traditional silicone rubber return frames and aerogel processes. Therefore, under the same thermal insulation performance conditions, the processing and manufacturing cost of the thermal insulation pad 100 of the embodiment of the utility model is lower, which can bring low-cost benefits.

[0037] The vehicle of the embodiment of the utility model includes the battery pack described in any of the above embodiments.

[0038] Therefore, the vehicle of the embodiment of the utility model has the advantage of high thermal safety performance of the battery pack.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A thermal insulation pad, characterized in that: include: A heat-insulating elastic sheet, which can be elastically deformed in the thickness direction to provide a buffering function for the heat-insulating pad; and A heat insulation sheet is attached to at least one side of the heat insulation elastic sheet in the thickness direction to provide a heat insulation function for the heat insulation pad.

2. The thermal insulation pad according to claim 1, characterized in that: A support sheet is provided between the thermal insulation elastic sheet and the thermal insulation sheet. The support sheet is respectively attached to the thermal insulation elastic sheet and the thermal insulation sheet, and is used to support the thermal insulation sheet and the thermal insulation elastic sheet.

3. The thermal insulation pad according to claim 1, characterized in that: The heat insulation sheet is made of mica or ceramic silicone rubber.

4. The thermal insulation pad according to claim 3, characterized in that: The thickness of the heat insulation sheet is less than or equal to 0.2 mm.

5. The thermal insulation pad according to claim 2, characterized in that: The supporting sheet is made of fiber material.

6. The thermal insulation pad according to claim 5, characterized in that: The thickness of the support sheet is 0.1 mm-0.2 mm.

7. The thermal insulation pad according to claim 1, characterized in that: The heat-insulating elastic sheet is made by foaming foam.

8. The thermal insulation pad according to claim 7, characterized in that: The thickness of the heat-insulating elastic sheet is 3mm-4mm.

9. A battery pack, characterized in that: include: A thermal insulation pad, wherein the thermal insulation pad is the thermal insulation pad according to any one of claims 1 to 8; and A plurality of battery cells, wherein the heat insulating pad is arranged between two adjacent battery cells.

10. A vehicle, characterized in that: Comprising the battery pack described in claim 9.

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