Heat insulation device and battery pack

Abstract

The utility model provides a heat insulation device and a battery pack, the heat insulation device is used for being arranged between two battery cells which are sequentially stacked along the Y direction, the Y direction is the thickness or width direction of the heat insulation device, the heat insulation device comprises a heat insulation mechanism, and the heat insulation mechanism comprises a liquid storage part and a heat insulation structure; the heat insulation structure comprises a water absorption part, and the water absorption part is used for being arranged opposite to the battery cell in the Y direction; the liquid storage part is connected to one side of the heat insulation structure in the Z direction, the liquid storage part is provided with a liquid storage cavity used for containing flame retardant liquid, and the Z direction is the height direction of the heat insulation device; in the Z direction, at least one side, facing the water absorption part, of the liquid storage part is provided with a weak area, and the weak area is at least used for being broken through when the battery cell is subjected to thermal runaway, so that the flame-retardant liquid flows out of the liquid storage cavity to infiltrate at least part of the water absorption part, and the heat insulation effect of the heat insulation device can be improved to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a heat insulation device and a battery pack. Background Technology

[0002] A battery pack typically includes battery cells, with at least two cells stacked sequentially along the Y direction.

[0003] During use, if one battery cell experiences thermal runaway, it can easily spread to other cells, leading to battery explosions and fires. To prevent this, a thermal insulation device is typically installed between connected cells. However, the thermal insulation performance of these devices is often poor. Utility Model Content

[0004] In view of this, the present invention aims to provide a heat insulation device and a battery pack to improve the heat insulation effect of the heat insulation device to a certain extent.

[0005] In a first aspect, the present invention provides a heat insulation device for being disposed between two battery cells stacked sequentially along the Y direction, wherein the Y direction is the thickness or width direction of the heat insulation device, and the heat insulation device includes a heat insulation mechanism, wherein the heat insulation mechanism includes a liquid storage component and a heat insulation structure;

[0006] The heat insulation structure includes a water-absorbing element, which is disposed opposite to the battery cell along the Y direction; along the Z direction, a liquid storage element is connected to one side of the heat insulation structure, and the liquid storage element has a liquid storage cavity for containing flame retardant liquid, wherein the Z direction is the height direction of the heat insulation device;

[0007] Along the Z direction, the liquid storage element has a weak area on at least one side facing the absorbent element, the weak area being at least designed to be ruptured in the event of thermal runaway of the battery cell, allowing the flame retardant liquid to flow out of the liquid storage cavity to wet at least a portion of the absorbent element.

[0008] Optionally, the liquid storage component has a liquid outlet on the side facing the water absorption component along the Z direction;

[0009] A sealing element is provided at the liquid outlet, which can be ruptured when the battery cell experiences thermal runaway, so that the flame retardant liquid can flow out of the storage chamber through the liquid outlet; the sealing element forms the weak area.

[0010] Optionally, the water-absorbing element is provided with a first guide groove extending along the Z direction and penetrating the water-absorbing element;

[0011] The opening of the first flow guide groove is oriented towards the battery cell;

[0012] And / or, a second guide channel with its opening facing the liquid storage cavity is provided on the cavity wall of the liquid storage cavity, and the end of the second guide channel near the weak area is open;

[0013] And / or, the absorbent element is elastic;

[0014] And / or, the absorbent element includes absorbent foam.

[0015] Optionally, the heat insulation structure further includes a heat insulation element located on one side of the water-absorbing element along the Y direction;

[0016] The thermal insulation component includes thermal insulation aerogel;

[0017] And / or, the absorbent element is at least two, and the at least two absorbent elements are arranged at intervals along the Y direction between two adjacent cells; the liquid storage element has at least one weak area at the position of each absorbent element.

[0018] Optionally, the liquid storage device has a first positioning groove, and the edge of the heat insulation structure facing the liquid storage device extends into the first positioning groove to position the heat insulation structure.

[0019] And / or, the liquid reservoir is elastic;

[0020] And / or, the reservoir includes a reservoir silicone.

[0021] Optionally, a reinforcing section is provided inside the liquid storage cavity;

[0022] The reinforcing part includes a reinforcing rib disposed in the liquid storage cavity and extending along the Z direction; and / or, the reinforcing part is disposed in the middle of the liquid storage cavity along the X direction, the X direction being the length direction of the heat insulation device; and / or, the liquid storage component has an injection hole communicating with the liquid storage cavity, the reinforcing part is disposed at the injection hole, and there is a liquid passage gap between the reinforcing part and the cavity wall of the liquid storage cavity located at the outer edge of the injection hole.

[0023] Optionally, the heat insulation mechanism further includes a connector, which is connected to the liquid storage component and together encloses a central empty frame area, and the heat insulation structure is located within the central empty frame area;

[0024] The connector is provided with a second positioning groove, which is at least used for a portion of the liquid storage component to extend into in order to connect the connector and the liquid storage component.

[0025] The second positioning groove is interference-fitted with the liquid storage component; and / or, an adhesive is provided between the second positioning groove and the liquid storage component; and / or, the heat insulation structure extends into the second positioning groove; and / or, the connector is elastic.

[0026] Optionally, the heat insulation device may further include a protective film covering the outside of the heat insulation mechanism;

[0027] The protective film includes a heat-shrinkable protective film; and / or, after the protective film covers the outside of the heat insulation mechanism, the interior of the protective film has a vacuum structure.

[0028] Secondly, this utility model provides a battery pack, including a battery cell and a heat insulation device as described above;

[0029] The battery cell is at least two and is stacked sequentially along the Y direction. Among all the battery cells, at least some of the adjacent two battery cells are provided with the heat insulation device.

[0030] Optionally, in a plane perpendicular to the Y direction, the dimensions of the heat insulation device are adapted to the dimensions of the battery cell;

[0031] The dimension of the absorbent element along the Z direction is not less than 5 / 6 of the height dimension of the battery cell along the Z direction.

[0032] The present invention provides a heat insulation device and a battery pack. The heat insulation device is disposed between two battery cells stacked sequentially along the Y direction. The heat insulation device includes a heat insulation mechanism, which includes a liquid storage component and a heat insulation structure. The heat insulation structure includes a water-absorbing component, which is disposed opposite to the battery cells along the Y direction. Along the Z direction, the liquid storage component is connected to one side of the heat insulation structure, so that the liquid storage component has a liquid storage cavity for containing flame retardant liquid. In the Z direction, at least one weak area is provided on the side of the liquid storage component facing the water-absorbing component, so that the weak area is at least designed to be broken through when the battery cell experiences thermal runaway, allowing the flame retardant liquid to flow out from the liquid storage cavity to wet at least part of the water-absorbing component. For example, when the heat insulation device and battery cells are assembled into a battery pack, the liquid storage device can be located on the upper side of the heat insulation structure along the Z direction. In the event of thermal runaway of the battery cell, the weak area on the liquid storage device will be broken through, allowing the flame retardant liquid to flow from the storage chamber to the water absorption device and be absorbed and stored there. After the flame retardant liquid is absorbed by the water absorption device, a liquid protective layer can be formed between two adjacent battery cells. The heat absorption and cooling of the flame retardant liquid can reduce the temperature of the battery cell and the heat insulation device, thereby providing heat insulation and flame retardancy for the battery cell. This can, to a certain extent, prevent the spread of thermal runaway, improve the safety of the battery pack, and buy time for the user to escape. Moreover, compared to directly immersing the absorbent component in flame retardant liquid, this method allows for heat insulation and flame retardancy of the battery cell while maintaining a separate design between the flame retardant liquid and the absorbent component before thermal runaway. This design helps prevent the flame retardant liquid from settling at the bottom of the absorbent component due to gravity before thermal runaway, thus avoiding uneven distribution. It achieves uniform distribution of the flame retardant liquid on the absorbent component, thereby improving the heat insulation and flame retardant effect of the insulation device, further preventing the spread of thermal runaway, and buying more time for the user to escape. Attached Figure Description

[0033] Figure 1 This is a partial structural schematic diagram of a battery pack according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the heat insulation mechanism according to an embodiment of the present invention;

[0035] Figure 3 This is a partial exploded structural diagram of the heat insulation mechanism according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the liquid storage device according to an embodiment of the present invention. Figure 1 ;

[0037] Figure 5 This is a schematic diagram of the structure of the liquid storage device according to an embodiment of the present invention. Figure 2 ;

[0038] Figure 6 for Figure 5 Enlarged structural diagram at point I;

[0039] Figure 7 for Figure 5 A schematic diagram of the cross-sectional structure along line A in the middle;

[0040] Figure 8 This is a schematic diagram of the heat insulation structure according to an embodiment of the present invention;

[0041] Figure 9 for Figure 8 Enlarged structural diagram at point B;

[0042] Figure 10 This is a schematic diagram of the structure of the heat insulation device according to an embodiment of the present invention.

[0043] Among them, 100 is the heat insulation device; 10 is the heat insulation mechanism; 1 is the liquid storage component; 11 is the liquid storage chamber; 111 is the second guide channel; 12 is the liquid outlet; 121 is the weak area; 13 is the first positioning groove; 14 is the reinforcing part; 15 is the liquid injection hole; 16 is the liquid passage gap; 101 is the central empty frame area; 2 is the heat insulation structure; 21 is the water absorption component; 211 is the first guide channel; 22 is the heat insulation component; 3 is the connecting component; 31 is the second positioning groove; 20 is the protective film; and 200 is the battery cell. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0045] A battery pack typically consists of at least two cells, stacked sequentially along the Y-axis. During use, if one cell experiences thermal runaway, it can easily spread to other cells, potentially leading to explosions or fires. To prevent this, thermal insulation devices are usually installed between adjacent cells. However, the insulation performance of these devices in current technology is often poor.

[0046] Based on this, the present invention provides a heat insulation device and a battery pack. By setting a heat insulation device between two stacked battery cells, the heat insulation device includes a liquid storage component and a water absorption component. The liquid storage component contains flame retardant liquid. Along the Z-direction, the liquid storage component is set on one side of the water absorption component, and a weak area is set on the side of the liquid storage component facing the water absorption component along the Z-direction. This weak area is designed to be broken through at least when the battery cell experiences thermal runaway, so that the flame retardant liquid flows from the liquid storage component to the water absorption component and is absorbed and stored by the water absorption component. The heat absorption and cooling effect of the flame retardant liquid can reduce the temperature of the battery cell and the heat insulation device, thereby playing a role in heat insulation and flame retardancy of the battery cell. This can, to a certain extent, prevent the spread of thermal runaway and improve the safety of the battery pack.

[0047] The heat insulation device and battery pack provided by this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments:

[0048] Reference Figures 1 to 10 As shown, this embodiment provides a heat insulation device 100, which can be applied to a battery pack. The battery pack may include at least two battery cells 200, which are stacked sequentially along the Y direction. The heat insulation device 100 is disposed between the two battery cells 200 stacked sequentially along the Y direction. The Y direction can be specifically referred to... Figure 1 , Figure 2 and Figure 9 For example, it can be the thickness or width direction of the heat insulation device 100, or the thickness or width direction of the battery cell 200.

[0049] Specifically, the heat insulation device 100 includes a heat insulation mechanism 10, which includes a liquid storage component 1 and a heat insulation structure 2.

[0050] The heat insulation structure 2 includes a water-absorbing member 21, which is positioned opposite to the battery cell 200 in the Y direction. In the Z direction, a liquid storage member 1 is connected to one side of the heat insulation structure 2, and the liquid storage member 1 has a liquid storage cavity 11 for containing flame-retardant liquid. The Z direction can be specifically referred to... Figure 1 and Figure 2 For example, it can be the height direction of the heat insulation device 100, or the height direction of the battery cell 200.

[0051] Along the Z direction, the liquid storage component 1 has a weak area 121 on at least one side facing the water absorption component 21. The weak area 121 is designed to be broken through when the cell 200 experiences thermal runaway, so that the flame retardant liquid flows out from the liquid storage cavity 11 to wet at least part of the water absorption component 21.

[0052] For example, the weak area 121 can be broken by being melted by the high-temperature thermal runaway gas when the cell 200 experiences thermal runaway, or it can be broken by the expansion and compression of the cell 200 when the cell 200 experiences thermal runaway, so as to destroy the sealing of the liquid storage cavity 11 and achieve the gas pressure balance inside and outside the liquid storage cavity 11.

[0053] For example, the flame retardant liquid can be a synthetic ester insulating oil, or it can be a nitrogen compound, etc.

[0054] The heat insulation device provided in this embodiment is arranged between two battery cells 200 stacked sequentially along the Y direction. The heat insulation device 100 includes a heat insulation mechanism 10, which includes a liquid storage component 1 and a heat insulation structure 2. The heat insulation structure 2 includes a water-absorbing component 21, which is arranged opposite to the battery cell 200 along the Y direction. Along the Z direction, the liquid storage component 1 is connected to one side of the heat insulation structure 2, so that the liquid storage component 1 has a liquid storage cavity 11 for containing flame retardant liquid. In the Z direction, a weak area 121 is provided on at least one side of the liquid storage component 1 facing the water-absorbing component 21, so that the weak area 121 is at least used to be broken when the battery cell 200 experiences thermal runaway, so that the flame retardant liquid flows out from the liquid storage cavity 11 to wet at least part of the water-absorbing component 21. For example, when the heat insulation device 100 and the battery cell 200 are formed into a battery pack, the liquid storage device 1 can be located on the upper side of the heat insulation structure 2 along the Z direction. In the event of thermal runaway of the battery cell 200, the weak area 121 on the liquid storage device 1 will be broken through, allowing the flame retardant liquid to flow from the liquid storage chamber 11 to the water absorption device 21 and be absorbed and stored by the water absorption device 21. After the flame retardant liquid is absorbed by the water absorption device 21, a liquid protective layer can be formed between two adjacent battery cells 200. The heat absorption and cooling of the flame retardant liquid can reduce the temperature of the battery cell 200 and the heat insulation device 100, thereby providing heat insulation and flame retardancy for the battery cell 200. This can prevent the spread of thermal runaway to a certain extent, improve the safety of the battery pack, and buy time for the user to escape. Moreover, compared to directly impregnating the absorbent component with flame retardant liquid, this method allows for heat insulation and flame retardancy of the battery cell 200 while maintaining a separate design for the flame retardant liquid and the absorbent component 21 before thermal runaway. This design can, to some extent, prevent the flame retardant liquid from depositing at the bottom of the absorbent component 21 due to gravity before thermal runaway, thus avoiding uneven distribution of the flame retardant liquid on the absorbent component 21. This achieves uniform distribution of the flame retardant liquid on the absorbent component 21, thereby improving the heat insulation and flame retardant effect of the heat insulation device 100, further preventing the spread of thermal runaway, and buying more time for the user to escape.

[0055] In some embodiments, refer to Figures 2 to 6As shown, the liquid storage component 1 has a liquid outlet 12 on the side facing the water absorption component 21 along the Z direction. A sealing component is provided at the liquid outlet 12, which can be broken through in the event of thermal runaway of the battery cell 200, so that the flame retardant liquid can flow out from the liquid storage chamber 11 through the liquid outlet 12. The sealing component is formed as a weak area 121.

[0056] This design allows the seal at the outlet 12 to be broken when thermal runaway occurs in the battery cell 200, exposing at least part of the outlet 12. This enables the flame retardant liquid to flow through the outlet 12 to the absorbent component 21, achieving the effect of wetting the absorbent component 21 with the flame retardant liquid, thereby providing heat insulation and flame retardancy. Simultaneously, the outlet 12 guides the flame retardant liquid in the storage chamber 11 and can also collect the flowing flame retardant liquid into a straight spray, ensuring the spraying effect of the flame retardant liquid on the absorbent component 21 and improving the safety of the battery pack.

[0057] For example, the sealing component being punctured could mean that when the cell 200 experiences thermal runaway, the sealing component melts, causing the outlet 12 to be exposed. Alternatively, it could mean that when the cell 200 experiences thermal runaway, the cell 200 expands and squeezes the liquid storage component 1, causing the sealing component to be punctured.

[0058] For example, the sealing element can be at least one of a sealing film and a sealing wax. For example, the sealing film can be a polyvinyl chloride film (PVE film) or a polyvinyl chloride film (PVC film). The sealing film can be applied to the liquid outlet 12, for example, through a lamination process.

[0059] Of course, in other implementations, the thickness of the liquid storage component 1 at the weak area 121 can be less than the thickness of the liquid storage component 1 at other locations, so that the weak area 121 can be broken through when the cell 200 experiences thermal runaway.

[0060] In some embodiments, refer to Figure 3 and Figure 7 The liquid storage component 1 has an injection hole 15 that communicates with the liquid storage chamber 11. This allows the flame retardant liquid to be injected into the liquid storage chamber 11 through the injection hole 15, thereby filling the flame retardant liquid.

[0061] For example, a sealing element can be installed at the injection hole 15 to seal the flame retardant liquid in the storage chamber 11.

[0062] Reference Figure 3 and Figure 7 The injection hole 15 can be located on the top of the liquid storage component 1, away from the water absorption component 21. Of course, the injection hole 15 can also be located at other positions on the liquid storage component 1, as long as it can achieve the filling of flame retardant liquid.

[0063] In some embodiments, refer to Figure 2 , Figures 8 to 9 As shown, the water-absorbing component 21 is provided with a first guide groove 211 extending along the Z direction and penetrating the water-absorbing component 21. The opening of the first guide groove 211 is oriented towards the battery cell 200.

[0064] This design guides the flame-retardant liquid flowing from the storage chamber 11 to the absorbent component 21, ensuring effective flow of the liquid and maximizing its immersion in the absorbent component 21. This, in turn, guarantees the heat insulation and flame-retardant effect of the heat insulation device 100. Furthermore, the first guide channel 211 allows for storage and containment of the flame-retardant liquid, further increasing the amount of liquid on the absorbent component 21 and thus enhancing the heat insulation and flame-retardant effect.

[0065] For example, there can be at least two first guide channels 211, and at least two first guide channels 211 are along... Figure 1 , Figure 2 and Figure 9 The components are arranged at intervals along the X direction, where the X direction can be, for example, the length direction of the heat insulation device 100 or the length direction of the battery cell 200.

[0066] For example, the first guide groove 211 can be a strip-shaped groove, or the first guide groove 211 can also be a mesh-shaped groove or a root-shaped groove.

[0067] In some embodiments, refer to Figure 7 As shown, a second guide groove 111 with its opening facing the liquid storage chamber 11 is provided on the wall of the liquid storage chamber 11, and one end of the second guide groove 111 near the weak area 121 is open.

[0068] This design allows the second guide channel 111 to guide the flow of the flame retardant liquid from the storage chamber 11 through the weak zone 121 to the absorbent component 21, ensuring smooth flow and a high flow rate. This improves the wetting efficiency of the flame retardant liquid on the absorbent component 21, further enhancing the heat insulation and flame retardant effect. Furthermore, the second guide channel 111 can also store and contain the flame retardant liquid to a certain extent, ensuring the continuity of its flow to the absorbent component 21, thereby further improving the heat insulation and flame retardant effect.

[0069] For example, there can be at least two second guide channels 111, which are configured to correspond one-to-one with the first guide channel 211.

[0070] In some embodiments, the absorbent 21 is elastic, so that while absorbing the flame retardant liquid and ensuring the heat insulation and flame retardant effect, the absorbent 21 can also deform under the pressure of the battery cell 200 when the battery cell 200 expands due to thermal runaway, so as to provide a certain degree of buffer protection for the battery cell 200, thereby preventing the battery cell 200 from being damaged to a certain extent.

[0071] In some embodiments, the absorbent element 21 includes absorbent foam, which enables good absorption of flame retardant liquid and provides cushioning protection for the battery cell 200 when it expands.

[0072] The absorbent foam can be, for example, silicone foam, rubber foam, or other heat-resistant and absorbent elastic composite materials.

[0073] For example, the water-absorbing component 21 can be made to move along... Figure 9 The thickness in the Y direction is 1mm.

[0074] Of course, in other embodiments, the water-absorbing element 21 can also be an absorbent sponge, etc.

[0075] In some embodiments, refer to Figures 8 to 9 As shown, there are at least two absorbent elements 21, which are arranged at intervals along the Y direction between two adjacent cells 200. Each absorbent element 21 in the liquid storage device has at least one weak area 121 at its corresponding position.

[0076] This design can improve the heat insulation and flame retardant effect of cell 200 in the event of thermal runaway, further preventing the spread of thermal runaway and making the battery pack safer to use.

[0077] In some embodiments, refer to Figures 8 to 9 As shown, the heat insulation structure 2 also includes a heat insulation element 22 located on the Y-direction side of the water-absorbing element 21.

[0078] This configuration further enhances the heat insulation and flame retardant effect of the heat insulation structure 2 through the heat insulation component 22, further preventing the spread of thermal runaway and making the battery pack safer to use.

[0079] For example, the heat insulation element 22 can be arranged along... Figure 9 The thickness in the Y direction ranges from 0.5mm to 2mm, for example, the thickness can be 0.5mm, 0.7mm, 0.9mm, 1mm, 1.25mm, 1.5mm, 1.8mm, or 2mm. For example, the thermal conductivity of the insulation component 22 under the UL94 test is required to be V0, meaning that the insulation component 22 must not burn for more than 10 seconds after the flame is removed and must not drip, to ensure the flame-retardant and self-extinguishing properties of the insulation component 22.

[0080] Reference Figure 9 When there are at least two water-absorbing elements 21, the above-mentioned heat insulation element 22 can be provided between at least some of the two adjacent water-absorbing elements 21.

[0081] In some embodiments, the thermal insulation component 22 includes thermal insulation aerogel, thereby effectively blocking heat during thermal runaway of the battery cell 200 and reducing heat transfer between adjacent battery cells 200. Furthermore, the thermal insulation aerogel has a certain degree of elasticity, allowing the thermal insulation component 22 to buffer the expansion of the battery cell 200 while providing thermal insulation, thus acting as a shock absorber. Moreover, after reaching a certain high temperature, the internal structure of the thermal insulation aerogel transforms into a dense, flame-retardant structure, preventing the spread of high temperatures during thermal runaway of the battery cell 200 and buying more time for the user to escape.

[0082] For example, thermal insulation aerogels can be ceramic fiber aerogels, glass fiber aerogels, pre-oxidized fiber aerogels, etc.

[0083] Of course, in other implementations, the heat insulation component 22 can also be heat-insulating mica, etc.

[0084] In some embodiments, refer to Figure 4 As shown, the liquid storage component 1 has a first positioning groove 13, and the edge of the heat insulation structure 2 facing the liquid storage component 1 extends into the first positioning groove 13 to position the heat insulation structure 2.

[0085] In this way, the heat insulation structure 2 is positioned by the first positioning groove 13, thereby realizing the connection between the liquid storage component 1 and the heat insulation structure 2, ensuring that the flame retardant liquid in the liquid storage component 1 can flow to the water absorption component 21, realizing the absorption and storage of the flame retardant liquid by the water absorption component 21, thereby achieving a good heat insulation effect.

[0086] For example, the weak area 121 can be set at the bottom wall of the first positioning groove 13.

[0087] In some embodiments, the reservoir 1 is elastic, so that while containing the flame retardant liquid, the reservoir 1 can also deform under the pressure of the battery cell 200 when the battery cell 200 expands due to thermal runaway, so as to provide a certain degree of buffer protection for the battery cell 200 and the reservoir 1, thereby preventing damage to the battery cell 200 to a certain extent.

[0088] In some embodiments, the reservoir 1 includes a reservoir silicone, which allows the reservoir 1 to contain the flame retardant liquid and to deform when the cell 200 expands, thereby providing cushioning protection for the cell 200 and the reservoir 1.

[0089] Of course, in other embodiments, the liquid storage component 1 may also include liquid storage rubber or other elastic materials with insulating and high-temperature resistant properties.

[0090] In some embodiments, refer to Figure 7 As shown, a reinforcing part 14 is provided inside the liquid storage chamber 11, which can enhance the strength of the liquid storage component 1 to a certain extent, thereby avoiding the situation where the liquid storage component 1 is excessively squeezed and damaged when the battery cell 200 thermally runs away.

[0091] In some embodiments, refer to Figure 7 As shown, the reinforcing part 14 includes a reinforcing rib disposed in the liquid storage cavity 11 and extending in the Z direction, which can ensure the structural strength of the liquid storage component 1 and prevent the liquid storage component 1 from being damaged by compression.

[0092] Among them, reinforcing ribs can be reinforcing plates, reinforcing strips, etc.

[0093] Of course, in other embodiments, the reinforcing part 14 may also be a reinforcing protrusion, a reinforcing groove, etc.

[0094] In some embodiments, refer to Figure 7 As shown, the reinforcing part 14 is disposed in the middle of the liquid storage cavity 11 along the X direction. This further ensures the structural reinforcement effect of the reinforcing part 14 on the liquid storage cavity 11, and further ensures the structural strength of the liquid storage component 1. The X direction can be, for example, the length direction of the heat insulation device 100, or the length direction of the battery cell 200.

[0095] In some embodiments, refer to Figure 7 As shown, the reinforcing part 14 is provided at the above-mentioned injection hole 15, and there is a liquid passage gap 16 between it and the cavity wall of the storage cavity 11 located at the outer edge of the injection hole 15.

[0096] This design can, to some extent, prevent the reinforcement part 14 from blocking the injection hole 15, so that while structurally reinforcing the liquid storage component 1, the normal injection of flame retardant liquid can also be ensured.

[0097] In some embodiments, refer to Figures 2 to 3 As shown, the heat insulation mechanism 10 also includes a connector 3, which is connected to the liquid storage component 1 and together they enclose a central empty frame area 101, and the heat insulation structure 2 is located within the central empty frame area 101.

[0098] By connecting the connector 3 and the liquid storage component 1, the heat insulation structure 2 can be positioned. Moreover, the central empty frame area 101 allows the heat insulation structure 2 to be exposed on the outside of the connector 3 and the liquid storage component 1, facing the side of the battery cell 200. Compared with the solution where the connector and the liquid storage component are covered on the outside of the heat insulation structure, this can ensure the heat insulation and flame retardant effect of the heat insulation structure 2 on the battery cell 200 to a certain extent.

[0099] In some embodiments, refer to Figure 3 As shown, the connector 3 is provided with a second positioning groove 31, which is at least used for a portion of the liquid storage component 1 to extend into, so as to connect the connector 3 and the liquid storage component 1.

[0100] In this way, the connection between the connector 3 and the liquid storage component 1 can be achieved through the second positioning groove 31. The connection method is simple and convenient, and the connection between the two is stable and reliable.

[0101] In some embodiments, the second positioning groove 31 is interference-fitted with the liquid storage component 1, which can ensure the stability of the liquid storage component 1 in the second positioning groove 31, thereby ensuring the reliable connection between the connector 3 and the liquid storage component 1, and further improving the stability of the heat insulation structure 2 in the central empty frame area 101, thus ensuring the heat insulation and flame retardant effect of the heat insulation structure 2.

[0102] In some embodiments, an adhesive is provided between the second positioning groove 31 and the liquid storage component 1, which can ensure a reliable connection between the connector 3 and the liquid storage component 1, thereby improving the stability of the heat insulation structure 2 within the central empty frame area 101 and ensuring the heat insulation and flame retardant effect of the heat insulation structure 2.

[0103] In some embodiments, refer to Figures 2 to 3 As shown, the heat insulation structure 2 extends into the second positioning groove 31. In this way, the connection and positioning of the liquid storage component 1 can also be achieved simultaneously through the second positioning groove 31. The connection is simple and convenient, and the connection between the heat insulation structure 2 and the connector 3 is stable and reliable.

[0104] In some embodiments, the connector 3 is elastic, so that when the cell 200 expands due to thermal runaway, the connector 3 can deform under the compression of the cell 200 to provide a certain degree of buffer protection for the cell 200 and the connector 3, thereby preventing damage to the cell 200 to a certain extent.

[0105] For example, connector 3 can be silicone foam, rubber foam, or other elastic materials with insulating and high-temperature resistant properties.

[0106] In some embodiments, refer to Figure 10As shown, the heat insulation device 100 also includes a protective film 20 covering the outside of the heat insulation mechanism 10. This protective film 20 can at least fix the heat insulation mechanism 10 to ensure the heat insulation and flame retardant effect of the heat insulation structure 2, while also ensuring the airtightness of the heat insulation device 100 to a certain extent. This prevents the flame retardant liquid from being exposed on the outside of the heat insulation device 100, ensuring the safety of the battery pack. It also protects the flame retardant liquid, preventing its failure. Furthermore, the flexibility of the protective film 20 improves the ease of covering and fixing the heat insulation mechanism 10.

[0107] For example, the protective film 20 can be wrapped around the outside of the heat insulation mechanism 10. The thickness of the protective film 20 can be set to no more than 0.5 mm, such as 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm.

[0108] For example, the heat insulation device 100 can be connected to the battery cell 200 in... Figure 1 After the large surfaces formed by the X and Z directions are pressed together, they are connected and fixed by the friction of the contact surfaces.

[0109] In some embodiments, the protective film 20 includes a protective heat-shrink film, so that when the battery cell 200 experiences thermal runaway, the protective film 20 can shrink and adhere to the outside of the heat insulation mechanism 10 after encountering high temperature, ensuring the covering effect and sealing and fixing effect of the heat insulation mechanism 10.

[0110] In some embodiments, after the protective film 20 covers the outside of the heat insulation mechanism 10, the interior of the protective film 20 is a vacuum structure. This ensures the vacuum between the protective film 20 and the heat insulation mechanism 10, isolates oxygen and other substances inside the protective film 20, prevents the heat insulation device 100 from burning, and further improves the heat insulation and flame retardant effect in the event of thermal runaway of the battery cell 200.

[0111] This embodiment also provides a battery pack, which can be applied to vehicles, such as electric vehicles and electric bicycles.

[0112] The battery pack specifically includes battery cells 200 and heat insulation devices 100. There are at least two battery cells 200, which are stacked sequentially along the Y direction. At least some of the adjacent battery cells 200 are provided with heat insulation devices 100.

[0113] In this way, the heat insulation device 100 can provide a certain degree of heat insulation and flame retardancy for the battery cell 200, prevent the spread of thermal runaway of the battery cell 200, and ensure the safety of the battery pack.

[0114] The structure and implementation principle of the heat insulation device 100 are the same as those of the heat insulation device 100 provided in the above embodiments, and it can bring the same or similar technical effects. They will not be described in detail here, but can be referred to the description of the above embodiments.

[0115] In some embodiments, refer to Figure 1 As shown, in a plane perpendicular to the Y direction, the dimensions of the heat insulation device 100 are adapted to the dimensions of the battery cell 200. The plane perpendicular to the Y direction can be, for example, [missing information - likely a specific plane or configuration]. Figure 1 The plane formed by the X and Z directions.

[0116] This further ensures the heat insulation and flame retardant effect of the heat insulation device 100 on the battery cell 200, further preventing the spread of thermal runaway of the battery cell 200, and making the battery pack safer to use.

[0117] In some embodiments, refer to Figures 2 to 3 As shown, the dimension of the water-absorbing component 21 along the Z direction is not less than 5 / 6 of the height dimension of the battery cell 200 along the Z direction. This ensures the dimension of the water-absorbing component 21 along the Z direction, thereby ensuring the absorption and storage capacity of the flame retardant liquid by the water-absorbing component 21, and further ensuring the heat insulation and flame retardant effect of the heat insulation structure 2.

[0118] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, the terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0119] In this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0120] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat insulation device for use between two battery cells (200) stacked sequentially along a Y direction, wherein the Y direction is the thickness or width direction of the heat insulation device (100), characterized in that, The heat insulation device (100) includes a heat insulation mechanism (10), which includes a liquid storage component (1) and a heat insulation structure (2); The heat insulation structure (2) includes a water-absorbing member (21) which is disposed opposite to the battery cell (200) along the Y direction; along the Z direction, the liquid storage member (1) is connected to one side of the heat insulation structure (2) and has a liquid storage cavity (11) for containing flame retardant liquid, wherein the Z direction is the height direction of the heat insulation device (100); Along the Z direction, the liquid storage member (1) has a weak area (121) on at least one side facing the water absorption member (21), the weak area (121) being at least designed to be ruptured when the cell (200) experiences thermal runaway, so that the flame retardant liquid flows out from the liquid storage cavity (11) to wet at least part of the water absorption member (21).

2. The heat insulation device according to claim 1, characterized in that, The liquid storage component (1) has a liquid outlet (12) on the side facing the water absorption component (21) along the Z direction; A sealing element is provided at the liquid outlet (12), which can be broken when the battery cell (200) experiences thermal runaway, so that the flame retardant liquid can flow out of the liquid storage chamber (11) through the liquid outlet (12); the sealing element forms the weak area (121).

3. The heat insulation device according to claim 1, characterized in that, The water-absorbing component (21) is provided with a first guide groove (211) extending along the Z direction and penetrating the water-absorbing component (21); the opening of the first guide groove (211) is arranged facing the battery cell (200); And / or, the cavity wall of the liquid storage cavity (11) is provided with a second guide groove (111) with the groove facing the liquid storage cavity (11), and the end of the second guide groove (111) near the weak area (121) is open; And / or, the absorbent element (21) is elastic; And / or, the absorbent element (21) includes absorbent foam.

4. The heat insulation device according to claim 1, characterized in that, The heat insulation structure (2) also includes a heat insulation member (22) located on the side of the water-absorbing member (21) along the Y direction; The thermal insulation component (22) includes thermal insulation aerogel; And / or, the absorbent element (21) is at least two, and at least two absorbent elements (21) are arranged at intervals along the Y direction between two adjacent cells (200); the liquid storage element (1) has at least one weak area (121) at the position corresponding to each absorbent element (21).

5. The heat insulation device according to claim 1, characterized in that, The liquid storage component (1) has a first positioning groove (13), and the edge of the heat insulation structure (2) facing the liquid storage component (1) extends into the first positioning groove (13) to position the heat insulation structure (2). And / or, the liquid reservoir (1) is elastic; And / or, the reservoir (1) includes reservoir silicone.

6. The heat insulation device according to claim 1, characterized in that, A reinforcing part (14) is provided inside the liquid storage chamber (11); The reinforcing part (14) includes a reinforcing rib disposed in the liquid storage cavity (11) and extending along the Z direction; and / or, the reinforcing part (14) is disposed in the middle of the liquid storage cavity (11) along the X direction, the X direction being the length direction of the heat insulation device (100); and / or, the liquid storage member (1) is provided with an injection hole (15) communicating with the liquid storage cavity (11), the reinforcing part (14) is disposed at the injection hole (15), and there is a liquid passage gap (16) between it and the cavity wall of the liquid storage cavity (11) located at the outer edge of the injection hole (15).

7. The heat insulation device according to claim 1, characterized in that, The heat insulation mechanism (10) further includes a connector (3), which is connected to the liquid storage component (1) and together encloses a central empty frame area (101), and the heat insulation structure (2) is located within the central empty frame area (101); The connector (3) is provided with a second positioning groove (31), which is at least used for a portion of the liquid storage component (1) to extend into in order to connect the connector (3) and the liquid storage component (1); The second positioning groove (31) is interference-fitted with the liquid storage component (1); and / or, an adhesive is provided between the second positioning groove (31) and the liquid storage component (1); and / or, the heat insulation structure (2) extends into the second positioning groove (31); and / or, the connector (3) is elastic.

8. The heat insulation device according to claim 1, characterized in that, The heat insulation device (100) also includes a protective film (20) covering the outside of the heat insulation mechanism (10); The protective film (20) includes a protective heat-shrinkable film; and / or, after the protective film (20) covers the outside of the heat insulation mechanism (10), the interior of the protective film (20) has a vacuum structure.

9. A battery pack, characterized in that, Includes a battery cell (200) and a heat insulation device (100) as described in any one of claims 1 to 8; The battery cell (200) is at least two and is stacked sequentially along the Y direction. Among all the battery cells (200), at least some of the adjacent battery cells (200) are provided with the heat insulation device.

10. The battery pack according to claim 9, characterized in that, In a plane perpendicular to the Y direction, the dimensions of the heat insulation device (100) are adapted to the dimensions of the battery cell (200); The dimension of the absorbent (21) along the Z direction is not less than 5 / 6 of the height dimension of the battery cell (200) along the Z direction.

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