Thermal protection sheet between battery cells of energy storage battery

Abstract

The utility model discloses a thermal protection sheet between battery cells of an energy storage battery. The thermal protection sheet comprises a thermal insulation radiating fin, the heat-insulating and heat-radiating fin comprises a middle heat-insulating and heat-insulating layer and heat-conducting and heat-radiating layers arranged on two sides of the heat-insulating and heat-insulating layer The heat insulation layer adopts a nano silicon composite heat insulation sheet; the heat conduction and heat dissipation layer is made of graphite flakes. The heat insulation radiating fin can resist the temperature of 1200 DEG C, can effectively prevent thermal runaway between battery cells and prolong the burn-through time, and has excellent temperature resistance, heat insulation, flame retardance and buffering functions; after the heat insulation radiating fins are adopted, the thickness of the whole protective sheet is reduced, space is saved, and the heat conductivity coefficient is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage battery technical field, concretely relates to a kind of energy storage battery cell inter thermal protection sheet. BACKGROUND

[0002] Energy storage battery pack is usually composed of multiple cells in series and parallel, and the cells will generate heat during operation due to charging and discharging. Local overheating may lead to thermal runaway, and even cause fire or explosion. Traditional thermal insulation sheets are mostly made of single material (such as ceramic fiber or mica sheet). Although they have thermal insulation performance, they cannot meet the requirements of thermal insulation and heat dissipation due to the limitations of single material. Therefore, there is an urgent need for a cell inter thermal insulation sheet that has high-efficiency thermal insulation and optimized heat dissipation. SUMMARY

[0003] To solve the above problems, the utility model provides a kind of energy storage battery cell inter thermal protection sheet, can effectively prevent cell inter thermal runaway, prolong burn-through time, with superior temperature resistance, thermal insulation, flame retardant and buffering function.

[0004] The technical scheme of the utility model is as follows: a kind of energy storage battery cell inter thermal protection sheet, including heat insulation and heat dissipation sheet;The heat insulation and heat dissipation sheet includes middle layer's heat insulation layer and the heat insulation layer both sides' heat conduction and heat dissipation layer;The heat insulation layer adopts nanometer silicon composite thermal insulation sheet;The heat conduction and heat dissipation layer adopts graphite sheet.

[0005] Further, the surface of the heat conduction and heat dissipation layer is distributed with several protrusions and grooves.

[0006] Further, the thickness of the heat insulation layer is 1-3mm.

[0007] Further, a porous elastic support pad is arranged between the heat insulation layer and the heat conduction and heat dissipation layer.

[0008] Further, the thickness of the heat conduction and heat dissipation layer is 1-3mm, and the surface is provided with heat dissipation grooves. The cross-sectional shape of the heat dissipation grooves is V-shaped, U-shaped or trapezoidal, and the groove width is 0.1-0.5mm.

[0009] Further, the heat dissipation grooves are filled with heat-conducting silicone.

[0010] Further, a flexible temperature sensor is arranged between the heat insulation layer and the heat conduction and heat dissipation layer. The flexible temperature sensor is connected to a micro wireless transmitter.

[0011] Further, it also includes an insulating support;The insulating support includes four protective corners and telescopic spacers;Two adjacent four protective corners are connected to form a rectangular frame by telescopic spacers;The heat insulation and heat dissipation sheet is provided with a slot for the insertion of telescopic spacers around.

[0012] Further, the protection angle is an L-shaped structure with a width of 1-2 cm; the telescopic partition includes fixed partitions on both sides and a movable partition in the middle which is in sliding connection with the fixed partitions; both ends of the movable partition are connected with the fixed partitions through locking elastic sheets.

[0013] The utility model discloses the beneficial effect is:

[0014] 1) the heat insulation and radiating fin of the utility model, the temperature resistance is 1200 DEG C, can effectively prevent the thermal runaway between electric core, prolongs the burning time, has superior temperature resistance, heat insulation, flame retardant and buffering function;After adopting heat insulation and radiating fin, the thickness of overall protection piece is thin, saves the space, and the heat conductivity coefficient is low.

[0015] 2) the setting of the radiating groove of the utility model increases the contact area of graphite sheet and air, improves the convection heat dissipation efficiency, can guide heat to diffuse along the specific direction, avoids local heat accumulation, and has more excellent heat dissipation effect.

[0016] 3) the continuous distribution of the convex and the groove is formed on the graphite sheet matrix, improves the adhesion with the surface of electric core, and reduces the contact thermal resistance caused by the gap.

[0017] 4) the flexible temperature sensor directly contacts heat source, and the surface temperature of electric core is collected in real time, avoids the measurement lag or error caused by the distance or fixed mode of traditional sensor.

[0018] 5) the telescopic partition of insulating support can be slightly adjusted, and the adaptability is stronger. DRAWINGS

[0019] The utility model will be further described below in combination with the drawings and examples.

[0020] Figure 1 It is the structural schematic diagram of example 1.

[0021] Figure 2 It is the structural schematic diagram of the heat conduction and radiating layer of example 2.

[0022] Figure 3 It is the structural schematic diagram of example 3.

[0023] Figure 4 It is the structural schematic diagram of example 4.

[0024] Figure 5 It is the structural schematic diagram of example 5.

[0025] Figure 6 It is the schematic diagram of telescopic partition. CONCRETE EMBODIMENT

[0026] The technical scheme of the utility model will be clearly and completely described below through concrete embodiment.

[0027] Reference Figure 1 The heat protection sheet between energy storage battery cells comprises a heat insulation and dissipation sheet 1, the heat insulation and dissipation sheet 1 comprises a middle heat insulation layer 11 and heat conduction and dissipation layers 12 arranged on both sides of the heat insulation layer, the heat insulation layer 11 is made of nano-silicon composite heat insulation sheet, and the thickness of the heat insulation layer 11 is 1-3 mm.

[0028] The heat insulation layer 11 and the heat conduction and dissipation layer 12 can be connected through inorganic adhesive.

[0029] The nano-silicon composite heat insulation sheet of the embodiment is composed of a reinforcing net and heat insulation layers arranged on both sides of the reinforcing net, the reinforcing net is composed of glass fiber, high-silica fiber or carbon fiber laying,

[0030] The heat insulation layer is prepared as follows: the raw materials (nano-silicon, heat radiation shielding micro powder, high-temperature inhibitor, etc.) are weighed according to the proportion, mixed and laid flat.

[0031] After the heat insulation layer is laid, the inorganic adhesive is sprayed, the reinforcing net is laid, the inorganic adhesive is sprayed on the reinforcing net, and then a layer of heat insulation layer raw material is laid; after compression molding, the nano-silicon composite heat insulation sheet is obtained.

[0032] The net-like skeleton in the laid heat insulation layer prolongs the path of heat transfer, makes heat conduction very difficult, forms a long and loose path effect, and the nano-pore structure forms numerous gas-solid interfaces, so that the heat conduction is reduced to close to the minimum limit.

[0033] The heat radiation shielding micro powder and the high-temperature inhibitor in the nano-silicon composite heat insulation sheet make the heat radiation reach the minimum.

[0034] In the embodiment, a plurality of protrusions and grooves are distributed on the surface of the heat conduction and dissipation layer 12, the protrusions and grooves are continuously distributed, the adhesion with the surface of the cell is improved, and the contact thermal resistance caused by the gap is reduced.

[0035] The heat insulation and dissipation sheet structure has the advantages of temperature resistance of 1200 DEG C, effective prevention of thermal runaway between cells, prolongation of burning time, excellent temperature resistance, heat insulation, flame retardation and buffering functions, thin thickness of the overall protection sheet after the heat insulation and dissipation sheet is used, space saving and low thermal conductivity.

[0036] Embodiment 2

[0037] Participation Figure 2 On the basis of the embodiment 1, the surface of the heat conduction and dissipation layer 12 is provided with heat dissipation grooves 14, the cross-sectional shape of the heat dissipation grooves 14 is V-shaped, U-shaped or trapezoidal, the groove width is 0.1-0.5 mm, and the heat dissipation grooves are filled with heat conduction silica gel 15.

[0038] The setting of the heat dissipation groove increases the contact area of the graphite sheet and air, improves the convection heat dissipation efficiency, can guide heat to spread along a specific direction, avoids local heat accumulation, and has more excellent heat dissipation effect.

[0039] Embodiment 3

[0040] Participate Figure 3 The porous elastic supporting pad 13 is arranged between the heat insulation layer 11 and the heat conduction and dissipation layer 12.

[0041] The porous elastic supporting pad 13 can play a better buffering function, absorbs thermal expansion pressure through its own deformation, avoids mutual extrusion deformation between the battery cells, and thus prevents internal short circuit or performance attenuation.

[0042] Embodiment 4

[0043] Participate Figure 4 A flexible temperature sensor 16 is arranged between the heat insulation layer 11 and the heat conduction and dissipation layer 12; and the flexible temperature sensor 16 is connected with a micro wireless transmitter 17.

[0044] The flexible temperature sensor of the embodiment directly contacts the heat source, collects the surface temperature of the battery cell in real time, and avoids measurement lag or error caused by distance or fixed mode of the traditional sensor.

[0045] Embodiment 5

[0046] Participate Figures 5-6 The protective sheet further comprises an insulating support 2; the insulating support 2 comprises four protective corners 21 and an elastic partition 22; two adjacent four protective corners 21 are connected to form a rectangular frame through the elastic partition 22; and the heat insulation and dissipation sheet 1 is provided with a slot for inserting the elastic partition 22.

[0047] The protective corner has an L-shaped structure and a width of 1-2 cm; the elastic partition 22 comprises fixed partitions 221 on both sides and movable partitions 222 arranged in the middle and in sliding connection with the fixed partitions; and the movable partitions 222 are connected with the fixed partitions 221 through locking elastic sheets 223 at both ends.

[0048] The elastic partition 22 of the insulating support 2 of the embodiment can be adjusted in size, avoids extrusion deformation or fracture of the insulating support, and thus improves the safety and service life of the battery pack.

[0049] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and those skilled in the art can make various modifications or equivalent replacements to the utility model within the essence and protection scope of the utility model, and the modification or equivalent replacement should also be regarded as falling within the protection scope of the technical scheme of the utility model.

Claims

1. An energy storage battery cell-to-cell thermal protection sheet, characterized by: The application relates to a heat-insulating and radiating sheet (1), which comprises a middle heat-insulating layer (11) and heat-conducting radiating layers (12) arranged on both sides of the heat-insulating layer; the heat-insulating layer (11) is made of nano-silicon composite heat-insulating sheet; and the heat-conducting radiating layer (12) is made of graphite sheet.

2. An energy storage battery cell-to-cell thermal protection sheet according to claim 1, wherein: The heat-conducting radiating layer (12) is provided with a plurality of protrusions and grooves on the surface.

3. An energy storage battery cell-to-cell thermal protection sheet according to claim 1, wherein: The thickness of the heat-insulating layer (11) is 1-3 mm.

4. The thermal protection sheet between energy storage battery cells of claim 1, wherein: A porous elastic supporting pad (13) is arranged between the heat-insulating layer (11) and the heat-conducting radiating layer (12).

5. An energy storage battery cell-to-cell thermal protection sheet according to claim 1, wherein: The thickness of the heat-conducting radiating layer (12) is 1-3 mm, the surface of the heat-conducting radiating layer (12) is provided with radiating grooves (14), the cross section shape of the radiating grooves (14) is V-shaped, U-shaped or trapezoidal, the groove width is 0.1-0.5 mm.

6. An energy storage battery cell-to-cell thermal protection sheet according to claim 5, wherein: The radiating grooves are filled with heat-conducting silica gel (15).

7. An energy storage battery cell-to-cell thermal protection sheet according to claim 1, wherein: A flexible temperature sensor (16) is arranged between the heat-insulating layer (11) and the heat-conducting radiating layer (12); and the flexible temperature sensor (16) is connected with a micro wireless transmitter (17).

8. An energy storage battery cell-to-cell thermal protection sheet according to claim 1, wherein: The application further relates to an insulating support (2), which comprises four protective corners (21) and telescopic partitions (22); two adjacent protective corners (21) are connected through the telescopic partitions (22) to form a rectangular frame; and the heat-insulating and radiating sheet (1) is provided with slot grooves for inserting the telescopic partitions (22) around the periphery.

9. An energy storage battery cell-to-cell thermal protection sheet according to claim 8, wherein: The protective corner is in L-shaped structure and has a width of 1-2 cm; the telescopic partition (22) comprises fixed partitions (221) on both sides and movable partitions (222) arranged in the middle and connected with the fixed partitions through sliding connection; and the both ends of the movable partition (222) are connected with the fixed partitions (221) through locking elastic sheets (223).

Images