Novel new energy battery cell flame-retardant sheet

Abstract

The utility model discloses a novel new energy battery cell flame-retardant sheet which comprises a heat insulation layer, the two flame-retardant layers are fixedly connected to the two sides of the heat insulation layer respectively; the two phase change layers are fixedly connected to the sides, away from each other, of the two flame-retardant layers respectively, each phase change layer comprises a first heat conduction plate, one side of each first heat conduction plate is fixedly connected with the corresponding flame-retardant layer, the other side of each first heat conduction plate is provided with a containing groove, and the containing grooves are filled with phase change microcapsules; and the second heat conducting plate is fixedly connected to the side, provided with the containing groove, of the first heat conducting plate. The utility model can prevent thermal runaway and restrain flame spread.

Description

Technical Field

[0001] The utility model relates to the technical field of flame retardant sheets, in particular to a novel flame retardant sheet for new energy battery cells. Background Art

[0002] Due to environmental degradation and energy shortages, developing a green economy and reducing carbon emissions have become a global consensus. The electrification of automobiles has become an important part of achieving carbon neutrality, and the development of new energy vehicles, led by electric vehicles, is unstoppable. As the core component and energy source of electric vehicles, power battery packs affect the safety and performance of electric vehicles. The battery pack of an electric vehicle is composed of multiple battery packs. A single power battery pack usually has multiple cells connected in series or in a hybrid manner to provide energy for the whole. When the battery cell outputs electricity for a long time, the chemical reaction in the battery cell for a long time will cause the battery cell to heat up significantly, and there is a risk of combustion and explosion. Utility Model Content

[0003] The utility model aims to provide a novel flame retardant sheet for new energy battery cells, which can prevent thermal runaway and inhibit the spread of flames.

[0004] A new type of flame retardant sheet for new energy battery cells, comprising:

[0005] Insulation layer;

[0006] Two flame retardant layers, the two flame retardant layers are respectively fixedly connected to two sides of the heat insulation layer;

[0007] Two phase change layers, the two phase change layers are respectively fixedly connected to the sides of the two flame retardant layers away from each other, and the phase change layers include:

[0008] A first heat conducting plate, wherein one side of the first heat conducting plate is fixedly connected to the flame retardant layer, and the other side of the first heat conducting plate is provided with a containing groove, and the containing groove is filled with phase change microcapsules;

[0009] The second heat conducting plate is fixedly connected to a side of the first heat conducting plate where the accommodating groove is provided.

[0010] Furthermore, the accommodating grooves are provided in plurality.

[0011] Furthermore, a heat conducting block is provided in each of the accommodating grooves, and a side of the heat conducting block away from the heat insulating layer is in contact with the second heat conducting plate.

[0012] Furthermore, the first heat conducting plate, the second heat conducting plate and the heat conducting block are all made of heat conducting silicone.

[0013] Furthermore, the thermal insulation layer comprises:

[0014] Mounting frame;

[0015] A heat insulation sheet, wherein the heat insulation sheet is arranged in the installation frame;

[0016] Two protective films are respectively fixed on two sides of the installation frame, and the two protective films are respectively attached to the two heat insulation sheets.

[0017] Furthermore, the thermal insulation sheet is made of aerogel felt.

[0018] Furthermore, the protective film is a PET film.

[0019] Furthermore, the flame retardant layer is a mica sheet.

[0020] Furthermore, a groove matching with the heat conducting block is provided on one side of the second heat conducting plate close to the heat conducting block, and one end of the heat conducting block close to the second heat conducting plate extends into the groove and contacts with the inner wall of the groove.

[0021] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] 1. The utility model is provided with a phase change layer. When the temperature of the battery core is too high, the heat of the battery core is transferred to the phase change microcapsule in the first heat conduction plate through the second heat conduction plate. The phase change microcapsule can absorb part of the heat to prevent the battery core from overheating. The heat that is not absorbed can be blocked by the heat insulation layer, reducing the heat transfer to the surrounding single battery cells, preventing thermal runaway, reducing the risk of battery core combustion, and improving the safety and reliability of the new energy vehicle battery pack during operation; and the flame retardant layer can suppress the spread of flames when the battery core burns.

[0024] 2. The utility model is provided with a plurality of grooves and heat-conducting blocks. The second heat-conducting plate can transfer heat to the heat-conducting block and transfer heat to the first heat-conducting plate through the heat-conducting block, thereby increasing the heat-conducting area with the phase-change microcapsules and improving the heat-conducting efficiency.

[0025] 3. The material of the second heat-conducting plate of the utility model is heat-conducting silica gel, which can play a buffering role when the car is bumped or collided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 for Figure 1 A magnified image of point A;

[0028] Figure 3 It is a schematic diagram of the explosion structure of the utility model;

[0029] Figure 4 is a schematic structural diagram of a first heat conducting plate;

[0030] Figure 5 is a schematic structural diagram of a second heat conducting plate;

[0031] Figure 6 is a cross-sectional schematic diagram of the phase change layer;

[0032] Figure 7 is a schematic diagram of the structure of the thermal insulation layer;

[0033] Figure 8 for Figure 7 Enlarged view of point B.

[0034] In the figure: 1. thermal insulation layer; 11. mounting frame; 12. thermal insulation sheet; 13. protective film; 21. first heat conducting plate; 211. receiving groove; 212. heat conducting block; 22. second heat conducting plate; 221. groove; 23. phase change microcapsule; 3. flame retardant layer. DETAILED DESCRIPTION

[0035] 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.

[0036] See also Figure 1-8 , an embodiment provided by the utility model:

[0037] A novel flame-retardant sheet for new energy battery cells comprises: a heat-insulating layer 1, two flame-retardant layers 3, and two phase-change layers; the two flame-retardant layers 3 are respectively fixedly connected to the two sides of the heat-insulating layer 1, and the flame-retardant layers 3 are fixedly connected to the heat-insulating layer 1 through an adhesive; the two phase-change layers are respectively fixedly connected to the sides of the two flame-retardant layers 3 away from each other, and the phase-change layers comprise: a first heat-conducting plate 21 and a second heat-conducting plate 22; one side of the first heat-conducting plate 21 is fixedly connected to the flame-retardant layer 3 through an adhesive, and the other side of the first heat-conducting plate 21 is provided with a receiving groove 211, and the receiving groove 211 is filled with phase-change microcapsules 23; the second heat-conducting plate 22 is fixedly connected to the side of the first heat-conducting plate 21 provided with the receiving groove 211 through an adhesive.

[0038] When the temperature of the battery cell is too high, the heat of the battery cell is transferred to the phase change microcapsule 23 in the first heat conduction plate 21 through the second heat conduction plate 22. The phase change microcapsule 23 can absorb part of the heat to prevent the battery cell from overheating. The heat that is not absorbed can be blocked by the heat insulation layer 1, reducing the heat transfer to the surrounding single battery cells, preventing thermal runaway, reducing the risk of battery cell combustion, and improving the safety and reliability of the new energy vehicle battery pack during operation; on the other hand, the flame retardant layer 3 can suppress the spread of flames when the battery cell burns. Among them, the phase change microcapsule 23 is a core-shell structure composed of a core material and a wall material. The wall material can be polystyrene and the core material can be paraffin. This part is the prior art and will not be repeated here. The core material as a phase change material is coated with a wall material, and it will not flow or leak during the solid-liquid phase change process, and has a longer service life.

[0039] Specifically, a plurality of accommodating grooves 211 are provided.

[0040] Specifically, each accommodating groove 211 is provided with a heat conducting block 212, and the side of the heat conducting block 212 away from the heat insulating layer 1 is in contact with the second heat conducting plate 22. The second heat conducting plate 22 can transfer heat to the heat conducting block 212 and transfer heat to the first heat conducting plate 21 through the heat conducting block 212, thereby increasing the heat conducting area with the phase change microcapsule 23 and improving the heat conducting efficiency.

[0041] Specifically, the first heat conducting plate 21, the second heat conducting plate 22, and the heat conducting block 212 are all made of heat conducting silicone. When the car bumps or collides, the battery box will be impacted by inertia, and the battery cells of the battery box may also be impacted. The second heat conducting plate 22 is made of heat conducting silicone, which can play a buffering role.

[0042] Specifically, the heat insulation layer 1 includes: an installation frame 11, a heat insulation sheet 12, and two protective films 13; the heat insulation sheet 12 is arranged in the installation frame 11; the two protective films 13 are respectively fixed on both sides of the installation frame 11, and the two protective films 13 are respectively attached to the two heat insulation sheets 12. The material of the installation frame 11 is silica gel, and the installation frame 11, the heat insulation sheet 12 and the two protective films 13 are connected by vacuum hot pressing, which is a prior art and will not be described in detail here.

[0043] Specifically, the material of the heat insulation sheet 12 is aerogel felt.

[0044] Specifically, the protective film 13 is a PET film.

[0045] Specifically, the flame retardant layer 3 is a mica sheet.

[0046] Specifically, a groove 221 matching with the heat conducting block 212 is provided on one side of the second heat conducting plate 22 close to the heat conducting block 212 , and one end of the heat conducting block 212 close to the second heat conducting plate 22 extends into the groove 221 and contacts the inner wall of the groove 221 .

[0047] Working principle: When in use, the utility model is sandwiched between two battery cells. When the temperature of the battery cell is too high, the heat of the battery cell is transferred to the phase change microcapsule 23 in the first heat conducting plate 21 through the second heat conducting plate 22. At the same time, the second heat conducting plate 22 can transfer the heat to the heat conducting block 212 and transfer the heat to the first heat conducting plate 21 through the heat conducting block 212, thereby increasing the heat conduction area with the phase change microcapsule 23 and improving the heat conduction efficiency; the phase change microcapsule 23 can absorb part of the heat to prevent the battery cell from overheating, and the heat that is not absorbed can be blocked by the heat insulation layer 1 to reduce the heat transfer to the surrounding single battery cells; since the material of the second heat conducting plate 22 is thermally conductive silicone, it can play a buffering role when the car is bumpy or collides; on the other hand, the flame retardant layer 3 can suppress the spread of flames when the battery cell burns.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A new type of flame retardant sheet for new energy batteries, characterized in that: include: Insulation layer; Two flame retardant layers, the two flame retardant layers are respectively fixedly connected to two sides of the heat insulation layer; Two phase change layers, the two phase change layers are respectively fixedly connected to the sides of the two flame retardant layers away from each other, and the phase change layers include: A first heat conducting plate, wherein one side of the first heat conducting plate is fixedly connected to the flame retardant layer, and the other side of the first heat conducting plate is provided with a containing groove, and the containing groove is filled with phase change microcapsules; The second heat conducting plate is fixedly connected to a side of the first heat conducting plate where the accommodating groove is provided.

2. The novel flame retardant sheet for new energy battery cells according to claim 1, characterized in that: There are multiple accommodating grooves.

3. The novel flame retardant sheet for new energy battery cells according to claim 2, characterized in that: A heat conducting block is arranged in each of the accommodating grooves, and a side of the heat conducting block away from the heat insulating layer is in contact with the second heat conducting plate.

4. The novel flame retardant sheet for new energy battery cells according to claim 3, characterized in that: The first heat conducting plate, the second heat conducting plate and the heat conducting block are all made of heat conducting silicone.

5. The novel flame retardant sheet for new energy battery cells according to claim 1, characterized in that: The thermal insulation layer comprises: Mounting frame; A heat insulation sheet, wherein the heat insulation sheet is arranged in the installation frame; Two protective films are respectively fixed on two sides of the installation frame, and the two protective films are respectively attached to the two heat insulation sheets.

6. The novel flame retardant sheet for new energy battery cells according to claim 5, characterized in that: The material of the heat insulation sheet is aerogel felt.

7. The novel flame retardant sheet for new energy battery cells according to claim 5, characterized in that: The protective film is a PET film.

8. The novel flame retardant sheet for new energy battery cells according to claim 1, characterized in that: The flame retardant layer is a mica sheet.

9. The novel flame retardant sheet for new energy battery cells according to claim 3, characterized in that: A groove matching with the heat conducting block is provided on one side of the second heat conducting plate close to the heat conducting block, and one end of the heat conducting block close to the second heat conducting plate extends into the groove and contacts with the inner wall of the groove.

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