Heat insulation structure for battery, battery module and battery pack

Abstract

The utility model relates to a heat insulation structure for a battery, a battery module and a battery pack, the heat insulation structure is arranged between adjacent battery cells and / or between adjacent battery modules, the heat insulation layer comprises a honeycomb hole-shaped structure, and heat storage pieces are accommodated in honeycomb holes of the honeycomb hole-shaped structure; the heat absorption protection layer is arranged on the heat insulation layer and comprises a heat conduction part used for conducting heat, and the heat conduction part is connected with the heat insulation layer in a heat conduction mode; the packaging film layer is packaged on the heat absorption protection layer in an insulation mode, the heat insulation structure has better impact resistance and heat insulation performance, and heat spreading is prevented for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field especially relates to a heat insulation structure for battery, battery module and battery pack. BACKGROUND

[0002] In the prior art, in order to prevent heat spread between battery pack electric cores, heat insulation material is generally used between electric cores to prevent heat conduction of thermal runaway electric core to adjacent electric core and prevent thermal runaway of adjacent electric core, and heat insulation between electric cores is generally selected from foam, silica gel back frame or aerogel as heat insulation material.When electric core thermal runaway occurs, the surface temperature of electric core can reach 800-1000 DEG C, and high temperature can quickly cause thermal runaway of adjacent electric core and even all electric cores in module;When all electric cores in module are thermal runaway, the module will be deformed and expanded, and the surface temperature of the module will also reach 800-1000 DEG C, and because the gap between modules is usually only 4mm, the expanded module will contact the adjacent module and cause heat conduction, and because there is usually no heat insulation material between modules, high temperature can quickly transfer to adjacent module and cause thermal runaway of adjacent module. Because the high temperature generated by continuous thermal runaway of a large number of electric cores and modules can aggravate the heat spread of battery pack, it can cause greater harm to the vehicle and personnel. In order to prevent heat spread between electric cores, heat insulation materials such as foam, silica gel back frame or aerogel are generally added between electric cores. However, the thermal runaway protection performance of such heat insulation materials is quite different, such as foam and silica gel back frame which will melt at 300-500 DEG C and have poor heat insulation performance and cannot completely prevent heat spread between electric cores, and although aerogel has good high temperature resistance and heat insulation performance, its impact resistance and heat insulation performance still cannot prevent heat spread between ternary soft package electric cores for a long time.

[0003] The above information disclosed in the background section is only used to enhance the understanding of the background of the utility model, and therefore can contain information that is not prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a heat insulation structure for battery, battery module and battery pack, which has better impact resistance and heat insulation performance and can prevent heat spread for a long time.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] The heat insulation structure for battery of the utility model is arranged between adjacent electric cores and / or arranged between adjacent battery modules, and the heat insulation structure comprises,

[0007] The heat insulation layer comprises a honeycomb hole structure, and the honeycomb hole structure contains heat storage members in the honeycomb holes;

[0008] A heat absorption protection layer is arranged on the heat insulation layer, and the heat absorption protection layer comprises a heat conduction part for heat conduction, which is in heat conduction connection with the heat insulation layer.

[0009] A packaging film layer is insulatively arranged on the heat absorption protection layer.

[0010] The heat storage member comprises liquid crystallization water.

[0011] The honeycomb hole structure is a multi-layer three-dimensional honeycomb structure.

[0012] The honeycomb hole structure comprises arrayed hexagonal honeycomb units.

[0013] The packaging film layer comprises an aluminum plastic film structure for insulation protection.

[0014] The heat conduction part comprises a foil strip.

[0015] A pair of heat absorption protection layers are respectively arranged on both sides of the heat insulation layer.

[0016] The heat absorption protection layer is arranged on the outer surface of the heat insulation layer.

[0017] A battery module comprises a heat insulation structure for a battery, which is arranged between adjacent battery cells and extends outward.

[0018] A battery pack comprises a box body and the battery module arranged in the box body.

[0019] In the above technical solution, the heat insulation structure for a battery prolongs the heat runaway propagation time between the minimum units of the battery cells, blocks the heat propagation between the second-level units of the modules, and thus realizes that only one module in the whole pack is in heat runaway; the heat insulation structure is used between the battery cells and the modules of the ternary soft pack, and finally achieves the purpose that only one module in the whole pack is in heat runaway, thereby avoiding more serious heat runaway of the whole pack and further ensuring the safety of the whole vehicle and the passenger cabin. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0021] Figure 1 The structural diagram of the heat insulation layer of the heat insulation structure for the battery of the utility model.

[0022] Figure 2 The structural diagram of the heat insulation layer of the heat insulation structure for the battery of the utility model.

[0023] Figure 3 The structural diagram of the heat insulation layer of the heat insulation structure for the battery of the utility model. Figure 2 The sectional structure schematic diagram of A_A of the heat insulation layer.

[0024] Figure 4 The structural diagram of the battery module of the utility model.

[0025] Figure 5 The structural diagram of the battery pack of the utility model.

[0026] The marks in the drawing are: heat insulation layer 1, honeycomb hole structure 2, heat absorption protection layer 3, encapsulation film layer 4, heat storage piece 5, heat insulation structure 6, electric core 7, box 8, battery module 9. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In order to make those skilled in the art better understand the technical scheme of the utility model, the utility model will be further described in detail below in combination with the drawings.

[0031] As Figures 1-5As shown, in one embodiment, the heat insulation structure for battery of the utility model is arranged between adjacent battery cells 7 and / or between adjacent battery modules 9, the heat insulation structure 6 comprises,

[0032] The heat insulation layer 1 comprises a honeycomb hole structure 2, and the honeycomb hole structure 2 comprises a heat storage element 5 in the honeycomb hole;

[0033] The heat absorption protection layer 3 is arranged on the heat insulation layer 1, and the heat absorption protection layer 3 comprises a heat conduction part for heat conduction, and the heat conduction part is in heat conduction connection with the heat insulation layer 1;

[0034] The encapsulation film layer 4 is encapsulated on the heat absorption protection layer 3 in an insulating manner.

[0035] In the preferred embodiment of the heat insulation structure for battery, the heat storage element 5 comprises liquid crystallization water.

[0036] In the preferred embodiment of the heat insulation structure for battery, the honeycomb hole structure 2 is a multi-layer three-dimensional honeycomb structure.

[0037] In the preferred embodiment of the heat insulation structure for battery, the honeycomb hole structure 2 comprises an array of hexagonal honeycomb units.

[0038] In the preferred embodiment of the heat insulation structure for battery, the encapsulation film layer 4 comprises an aluminum plastic film structure for insulation protection.

[0039] In the preferred embodiment of the heat insulation structure for battery, the heat conduction part comprises a foil strip.

[0040] In the preferred embodiment of the heat insulation structure for battery, a pair of heat absorption protection layers 3 are respectively laminated on both sides of the heat insulation layer 1.

[0041] In the preferred embodiment of the heat insulation structure for battery, the heat absorption protection layer 3 is coated on the outer surface of the heat insulation layer 1.

[0042] A battery module comprises a heat insulation structure 6 for battery, and the heat insulation structure 6 is arranged between adjacent battery cells 7 and extends outward.

[0043] A battery pack comprises a box 8 and the battery module 9 arranged in the box 8.

[0044] In one embodiment, as Figures 1-3As shown, the encapsulation film layer 4 is an aluminum-plastic film, and the material of the further encapsulation film layer 4 is consistent with the outer layer material of the ternary soft package, which plays an insulation protection role when no thermal runaway occurs, and when the battery cell 7 generates thermal runaway, the high temperature generated by the battery cell 7 can quickly melt the encapsulation film layer 4, and the 0.06mm thick high-thermal-conductivity metal steel foil of the heat absorption protection layer 3 can quickly absorb the heat generated by the encapsulation film layer 4. At this time, the heat storage member 5 is crystalline water which can quickly store the heat generated by thermal runaway, and the crystalline water absorbs heat and evaporates into gas at 150-300℃, and the evaporated crystalline water gas is discharged to the air domain above the module through the honeycomb hole structure 2 of the heat insulation layer 1, and when the crystalline water evaporates, the honeycomb hole structure 2 can also play a good heat insulation effect, so as to achieve the purpose of prolonging the heat spreading time. Figure 4 As shown, when the battery cell 7 generates thermal runaway, the adjacent battery cell 7 will also generate thermal runaway, and when the battery cell 7 continuously generates thermal runaway and spreads to the heat insulation structure 6 position, the heat insulation structure 6 quickly absorbs heat, stores heat and then discharges heat to the air domain above the battery module 9, thereby delaying the thermal runaway of the battery cell 7 on the other side for a long time, and finally realizing the purpose of delaying the thermal runaway of the whole module for a long time. Figure 5 As shown, the modules are uniformly arranged in the box 8 of the battery pack, and the 2mm thick heat insulation structure 6 is arranged between the adjacent battery modules 9, and when one of the battery modules 9 completely generates thermal runaway, the heat insulation structure 6 on both sides of the battery module 9 can prevent the adjacent battery module 9 from generating thermal runaway, thereby preventing the whole pack from generating more serious heat spreading.

[0045] In one embodiment, the heat absorption protection layer 3 is a double-sided ultra-thin structure, which has heat absorption and structural protection effects, the crystalline water of the heat insulation layer 1 evaporates into gas at 150-300℃, and the heat insulation layer 1 adopts a three-dimensional honeycomb structure formed by ceramic fiber or other low-thermal-conductivity materials.

[0046] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A thermal insulation structure for a battery, characterized by, The heat insulation structure is arranged between adjacent battery cells and / or between adjacent battery modules, and comprises, a heat insulation layer comprising a honeycomb structure, a honeycomb hole of the honeycomb structure containing a heat storage member; a heat absorption protective layer arranged on the heat insulation layer, the heat absorption protective layer comprising a heat conduction part for heat conduction, the heat conduction part being in heat conduction connection with the heat insulation layer; an encapsulation film layer encapsulated on the heat absorption protective layer in an insulating manner.

2. The thermal insulation structure for a battery according to claim 1, wherein The heat storage member comprises liquid crystallization water.

3. The thermal insulation structure for a battery according to claim 1, wherein The honeycomb structure is a multi-layer three-dimensional honeycomb structure.

4. The thermal insulation structure for a battery according to claim 1, wherein The honeycomb structure comprises arrayed hexagonal honeycomb units.

5. The insulation structure for a battery according to claim 1, wherein The encapsulation film layer comprises an aluminum plastic film structure for insulation protection.

6. The insulation structure for a battery according to claim 1, wherein The heat conduction part comprises a foil strip.

7. The insulation structure for a battery according to claim 1, wherein A pair of heat absorption protective layers are respectively laminated on both sides of the heat insulation layer.

8. The insulation structure for a battery according to claim 1, wherein The heat absorption protective layer is wrapped on the outer surface of the heat insulation layer.

9. A battery module, characterized by The battery module comprises a box body and a plurality of heat insulation structures arranged in the box body.

10. A battery pack, characterized by, The battery module comprises a box body and a plurality of heat insulation structures arranged in the box body.

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