Thermal insulation structure at end part of battery module, battery pack and energy storage device

Abstract

The utility model provides a battery module end part heat preservation structure, a battery pack and an energy storage device, the battery module end part heat preservation structure comprises a hard insulation plate and a heat insulation plate which are arranged on a battery core at the end part of the battery module, the hard insulation plate is made of polypropylene or polycarbonate, and the heat insulation plate is made of a heat insulation material. The heat insulation plate is made of micro-porous foamed polypropylene, melamine foam, silicon foam or polyurethane foam, and the hard insulation plate is connected with the heat insulation plate in a bonding manner. The heat preservation structure at the end part of the battery module disclosed by the utility model not only can effectively preserve heat of the battery cells at the end part, but also can reduce the cost, and has a very good use effect.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a heat preservation structure at the end of a battery module. The utility model also relates to a battery pack and an energy storage device provided with the heat preservation structure at the end of the battery module. Background Art

[0002] In the current related technologies, the insulation of the module end is mostly achieved by filling the outer side of the end battery cell with a material with low thermal conductivity to reduce the heat exchange between the end battery cell and the outside. At present, materials with low thermal conductivity such as epoxy boards, aerogels, and injection molded end plates are often used. However, the problems with the above materials are mainly that: the thermal conductivity of the epoxy board will increase after a certain period of aging, that is, the thermal conductivity will increase; the aerogel has a low hardness and high compressibility, which cannot meet the requirements of the end battery cell for expansion space; and the molding process of the injection molded end plate is complicated, the mold opening cost is expensive, and its thermal conductivity is greatly affected by the material. Moreover, the above-mentioned solutions all have the problem of high cost. Utility Model Content

[0003] In view of this, the utility model aims to provide a thermal insulation structure for the end of a battery module, so as to effectively insulate the end battery cells and reduce the cost at the same time.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A heat preservation structure at the end of a battery module, comprising a hard insulating plate and a heat insulation plate arranged on a battery cell at the end of the battery module;

[0006] The rigid insulating board is made of polypropylene or polycarbonate, the heat insulation board is made of microporous foamed polypropylene, melamine foam, silicon foam or polyurethane foam, and the rigid insulating board and the heat insulation board are bonded and connected.

[0007] Furthermore, the thickness of the rigid insulating board is between 0.8 mm and 1.2 mm.

[0008] Furthermore, the thickness of the heat insulation board is between 2 mm and 4 mm.

[0009] Furthermore, the heat insulation board is located between the hard insulating board and the battery cell at the end of the battery module, and an adhesive for bonding to the battery cell at the end of the battery module is provided on the heat insulation board.

[0010] Furthermore, the adhesive member is a double-sided adhesive strip.

[0011] Furthermore, the double-sided adhesive strips are multiple and are arranged at intervals on the insulation board.

[0012] Furthermore, the rigid insulating board and the heat insulation board are connected by bonding with double-sided adhesive.

[0013] Furthermore, the hard insulating plate and the heat insulating plate have the same area, and the area of ​​the heat insulating plate accounts for more than 90% of the large surface area of ​​the battery cell at the end of the battery module.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The heat preservation structure at the end of the battery module described in the utility model is provided with a hard insulating plate and a heat insulating plate on the end battery cell, and the hard insulating plate is made of polypropylene or polycarbonate, and the heat insulating plate is made of microporous foamed polypropylene, melamine foam, silicon foam or polyurethane foam, thereby utilizing the heat insulating properties of the heat insulating member to effectively insulate the end battery cell and also reduce costs. Moreover, the provision of the hard insulating plate can prevent the heat insulating plate from being scratched, dropped or scraped due to friction during the process of packing or transporting the battery module, and thus play a certain protective role on the heat insulating plate.

[0016] In addition, the thickness of the rigid insulating board can not only ensure sufficient structural strength, but also help to ensure the size of the two ends of the battery module. The thickness of the heat insulation board can further improve the insulation effect of the battery cells at the end of the module. The adhesive provided on the heat insulation board is conducive to the bonding and connection of the heat insulation board to the battery cells at the end of the battery module, and the structure is simple, which is easy to design and implement.

[0017] In addition, the adhesive member adopts double-sided adhesive strips, which have the characteristics of simple structure and low cost. The double-sided adhesive strips are arranged in multiple intervals, which can further ensure the reliability of the bonding between the insulation board and the end cells of the battery module. The area limitation of the hard insulation board and the insulation board, as well as the area limitation between the insulation board and the large surface of the end cells of the battery module, can further improve the insulation effect of the end cells.

[0018] Another object of the present invention is to provide a battery pack, in which the thermal insulation structure at the end of the battery module as described above is provided.

[0019] Another object of the present invention is to provide an energy storage device, wherein the energy storage device is provided with the thermal insulation structure at the end of the battery module as described above.

[0020] The battery pack and energy storage device of the present invention can effectively insulate the battery cells at the end of the battery module by adopting the thermal insulation structure at the end of the battery module as described above, and can also reduce costs, thereby helping to improve the performance of the battery pack and the energy storage device and also helping to reduce the manufacturing cost of the battery pack and the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0022] Figure 1 The heat preservation structure of the end of the battery module described in the embodiment of the utility model;

[0023] Description of reference numerals:

[0024] 1. Hard insulation board; 2. Heat insulation board; 3. Adhesive parts; 4. Double-sided tape. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] Embodiment 1

[0030] The present embodiment relates to a thermal insulation structure at the end of a battery module, which can effectively insulate the battery cells at the end and also reduce costs.

[0031] In terms of overall structure, the thermal insulation structure at the end of the battery module of this embodiment is as follows: Figure 1As shown, the heat preservation structure includes a hard insulating board 1 and a heat insulation board 2 arranged on the battery cell at the end of the battery module. The hard insulating board 1 is made of polypropylene or polycarbonate, and the heat insulation board 2 is made of microporous foamed polypropylene, melamine foam, silicon foam or polyurethane foam, and the hard insulating board 1 and the heat insulation board 2 are bonded and connected.

[0032] At this time, the hard insulating board 1 made of polypropylene or polycarbonate has sufficient strength and low cost, and the heat insulation board 2 made of microporous foamed polypropylene, melamine foam, silicone foam or polyurethane foam has low thermal conductivity and low cost. Therefore, the heat insulation performance of the heat insulation component can be used to effectively insulate the end battery cells and reduce costs. In addition, during the process of packing or transporting the battery module, the hard insulating board 1 can prevent the heat insulation board 2 from being scratched, dropped or scraped due to friction, and can play a certain protective role on the heat insulation board 2.

[0033] Based on the above overall structure, in detail, in this embodiment, the hard insulating board 1 and the heat insulation board 2 are bonded together, and the heat insulation board 2 is connected to the end cell of the battery module, and the hard insulating board 1 is located on the side of the heat insulation board 2 away from the end cell of the battery module.

[0034] In this embodiment, the thickness of the rigid insulating plate 1 is between 0.8 mm and 1.2 mm. This arrangement can ensure sufficient structural strength and is also conducive to ensuring the size of both ends of the battery module. In specific implementation, the thickness of the rigid insulating plate 1 can be set to 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm or 1.2 mm, etc., and is preferably set to 1.0 mm.

[0035] Moreover, in this embodiment, the thickness of the heat insulation board 2 is between 2 mm and 4 mm. The limitation of the thickness of the heat insulation board 2 can further improve the insulation effect of the battery cells at the end of the battery module. In specific implementation, the thickness of the heat insulation board 2 can be set to 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm, and is preferably set to 3 mm.

[0036] In this embodiment, as a preference, the rigid insulating board 1 is made of polypropylene, and the heat insulating board 2 is preferably made of microporous foamed polypropylene. In specific implementation, the microporous foamed polypropylene is selected to have a foaming ratio of 10 times, and its thermal conductivity is ≤0.1W / mk, which can have a good heat preservation effect on the battery cells at the end of the module when used.

[0037] It should be noted that the thickness of the heat insulation board 2, that is, the thickness of the microporous foamed polypropylene board, can be selected according to the expansion space requirements of the battery cell. Moreover, it can be understood that by adjusting the foaming ratio or thickness of the hollow foamed polypropylene board, it can be applied to the expansion space requirements of different battery cells, thereby having a wide range of applicability while having cost advantages.

[0038] As a preferred embodiment, in this embodiment, the heat insulation board 2 is specifically located between the hard insulating board 1 and the battery cell at the end of the battery module, and an adhesive 3 for bonding to the battery cell at the end of the battery module is provided on the heat insulation board 2. At this time, the provision of the adhesive 3 is conducive to the bonding of the heat insulation board 2 to the battery cell at the end of the battery module, and can ensure the reliability of the connection between the heat insulation board 2 and the battery cell at the end of the battery module.

[0039] Specifically, the adhesive member 3 is a double-sided adhesive strip. Moreover, as a preference, the double-sided adhesive strip is a plurality of strips arranged at intervals on the heat insulation board 2. This can further ensure the reliability of the connection between the heat insulation board 2 and the battery cells at the end of the battery module. Among them, in a specific implementation, the double-sided adhesive strip can be a plurality of strips arranged at intervals along the length direction of the heat insulation board 2, or can be set to a plurality of strips arranged at intervals along the width direction of the heat insulation board 2.

[0040] It should be noted that, in addition to the double-sided adhesive strip, the adhesive member 3 may also be made of glue, that is, the heat insulation board 2 is bonded and connected to the battery cell at the end of the battery module by glue. This is also feasible.

[0041] In this embodiment, the rigid insulating board 1 and the heat insulating board 2 are connected by double-sided adhesive. The structure is simple, easy to operate, and low in cost. As a preferred embodiment, in this embodiment, the rigid insulating board 1 and the heat insulating board 2 have the same area, and the area of ​​the heat insulating board 2 accounts for more than 90% of the large surface area of ​​the battery cell at the end of the battery module. Such a setting can further improve the insulation effect of the battery cell at the end of the battery module.

[0042] In addition, it is worth noting that when a module end plate is provided at the end of the battery module, glue needs to be applied on the side of the rigid insulating plate 1 facing the module end plate and fixed to the module end plate by gluing. Of course, it is understandable that the rigid insulating plate 1 can also be bonded to the module end plate by double-sided adhesive 4, which is also feasible.

[0043] The thermal insulation structure at the end of the battery module of this embodiment not only has a good thermal insulation effect, but also has a certain protective effect on the end of the battery module. It is also low in cost and has wide applicability, thus having a good use effect.

[0044] Embodiment 2

[0045] The present embodiment relates to a battery pack, in which the thermal insulation structure at the end of the battery module described in the first embodiment is provided.

[0046] At the same time, this embodiment also relates to an energy storage device, which is also provided with the thermal insulation structure at the end of the battery module of embodiment 1. The energy storage device has multiple battery modules, and at least one of the battery modules is provided with the thermal insulation structure of embodiment 1 at its end.

[0047] The battery pack and energy storage device of this embodiment can effectively insulate the battery cells at the end of the battery module by adopting the insulation structure at the end of the battery module as described above, and can also reduce costs, thereby helping to improve the performance of the battery pack and the energy storage device and also helping to reduce the manufacturing cost of the battery pack and the energy storage device.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal insulation structure for the end of a battery module, characterized in that: It includes a hard insulating plate and a heat insulating plate arranged on the battery cells at the end of the battery module; The rigid insulating board is made of polypropylene or polycarbonate, the heat insulation board is made of microporous foamed polypropylene, melamine foam, silicon foam or polyurethane foam, and the rigid insulating board and the heat insulation board are bonded and connected.

2. The heat preservation structure at the end of the battery module according to claim 1, characterized in that: The thickness of the rigid insulating board is between 0.8 mm and 1.2 mm.

3. The heat preservation structure at the end of the battery module according to claim 1, characterized in that: The thickness of the heat insulation board is between 2mm and 4mm.

4. The heat preservation structure at the end of the battery module according to claim 1, characterized in that: The heat insulation board is located between the hard insulating board and the battery cell at the end of the battery module, and an adhesive member for bonding to the battery cell at the end of the battery module is provided on the heat insulation board.

5. The heat preservation structure at the end of the battery module according to claim 4, characterized in that: The adhesive member adopts a double-sided adhesive strip.

6. The heat preservation structure at the end of the battery module according to claim 5, characterized in that: The double-sided adhesive strips are multiple and are arranged on the insulation board at intervals.

7. The heat preservation structure at the end of the battery module according to claim 1, characterized in that: The hard insulating board and the heat insulation board are connected by bonding with double-sided adhesive.

8. The heat preservation structure at the end of the battery module according to any one of claims 1 to 7, characterized in that: The hard insulating plate and the heat insulating plate have the same area, and the area of ​​the heat insulating plate accounts for more than 90% of the large surface area of ​​the battery cell at the end of the battery module.

9. A battery pack, characterized in that: The battery pack is provided with a heat preservation structure at the end of the battery module as claimed in any one of claims 1 to 8.

10. An energy storage device, characterized in that: The energy storage device is provided with a heat preservation structure at the end of the battery module as described in any one of claims 1-8.

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