Cooling device, battery pack and electric equipment

Abstract

The utility model discloses a cooling device, a battery pack and electric equipment, the cooling device comprises a phase change structure, the phase change structure comprises a plurality of phase change blocks, and the plurality of phase change blocks are arranged at intervals in an array shape; the phase change blocks are correspondingly coated with the packaging pieces; the packaging pieces are packaged outside the multiple packaging pieces, exhaust gaps are formed between the adjacent phase change blocks, and the phase change structures absorb heat through phase change so as to ensure the cooling rate of the cooling device on the battery cell; and each phase change block in the phase change structure is independently arranged through the packaging piece, so that the structural stability of the cooling device is improved, and the thermal management effect of the cooling device on the battery cell is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange. Specifically, the utility model relates to a cooling device, a battery pack and an electrical equipment. Background Art

[0002] The problem of heat generated during the charging and discharging process of the battery is becoming increasingly prominent. Especially when the battery is abnormally charged and discharged, the temperature rise is too high, which requires a heat dissipation structure to dissipate heat from the battery.

[0003] The heat dissipation efficiency of the traditional heat dissipation structure is low, and it is difficult to dissipate heat from a single cell with too high temperature rise in time, which not only affects the thermal management effect of the battery, but also may cause heat to spread to other cells, resulting in a reduction in the reliability of the battery. Summary of the Utility Model

[0004] An object of the utility model is to provide a new technical solution for a cooling device, a battery pack and an electrical equipment.

[0005] According to the first aspect of the utility model, a cooling device is provided, which is used to be arranged between adjacent cells and includes:

[0006] A phase change structure, the phase change structure includes a plurality of phase change blocks, and the plurality of phase change blocks are arranged at intervals in an array;

[0007] A plurality of packaging members, the packaging members correspondingly cover the phase change blocks;

[0008] An encapsulation member, the encapsulation member encapsulates outside the plurality of packaging members, and an exhaust gap is formed between adjacent phase change blocks.

[0009] Optionally, the plurality of phase change blocks are arranged at intervals in a direction parallel to the extension direction of the cells;

[0010] In the extension direction of the cells, the gap size range of the exhaust gap is 1-3 mm.

[0011] Optionally, the encapsulation member is provided with a deflation area, and the exhaust gap communicates with the deflation area;

[0012] When the air pressure in the exhaust gap is greater than or equal to the set pressure, the deflation area can be opened to realize the external communication of the exhaust gap.

[0013] Optionally, the phase change block includes a phase change part and an elastic part, the phase change part is adapted to undergo a phase change at a preset temperature, and the elastic part is embedded in the phase change part.

[0014] Optionally, the elastic part can deform following the temperature change.

[0015] Optionally, the elastic part can be deformed when the temperature increases for abutting between two adjacent battery cells.

[0016] Optionally, the elastic force of the elastic part increases as the temperature increases.

[0017] Optionally, the elastic part is a shape memory metal part, and the deformation temperature of the shape memory metal part is higher than the solidification point temperature of the phase change part.

[0018] Optionally, the difference between the deformation temperature of the shape memory metal part and the solidification point temperature of the phase change part ranges from 10°C to 30°C.

[0019] Optionally, the shape of the shape memory metal part is net-shaped, flat plate-shaped or spiral-shaped.

[0020] Optionally, the packaging is a breathable part.

[0021] Optionally, the packaging has ventilation holes. The diameter of the liquid droplets of the liquid phase of the phase change part is D, and the aperture range of the ventilation holes is 1 / 2D - 4 / 5D.

[0022] According to the second aspect of the present invention, a battery pack is provided. The battery pack includes a plurality of battery cells and the cooling device described in the first aspect;

[0023] The cooling device is arranged in the assembly gap between adjacent battery cells.

[0024] Optionally, in the arrangement direction of adjacent battery cells, the orthographic projection area of the cooling device on the battery cell is smaller than the area of the battery cell to form an exhaust channel on the periphery of the assembly gap.

[0025] Optionally, in the height direction of the battery pack, the ratio of the size of the exhaust channel to the size of the battery cell ranges from 0.01 to 0.03.

[0026] According to the third aspect of the present invention, an electrical equipment is provided. The electrical equipment includes the battery pack described in the second aspect.

[0027] One technical effect of the present invention is that:

[0028] An embodiment of the present utility model discloses a cooling device. The cooling device includes a phase change structure, which includes a plurality of phase change blocks. The plurality of phase change blocks are arranged at intervals in an array; a plurality of packaging members, one packaging member corresponding to and covering one phase change block; and a packaging component, which is packaged outside the plurality of packaging members. An exhaust gap is formed between adjacent phase change blocks. The phase change structure absorbs heat through phase change and quickly discharges the gas after phase change through the exhaust gap to ensure the cooling rate of the cooling device for the battery cell. Moreover, each phase change block in the phase change structure is independently arranged through the packaging member, improving the structural stability of the cooling device and ensuring the thermal management effect of the cooling device on the battery cell.

[0029] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0031] Figure 1 A partial schematic view of a battery pack provided by an embodiment of the present utility model;

[0032] Figure 2 A partial exploded view of a battery pack provided by an embodiment of the present utility model;

[0033] Figure 3 A schematic view of a cooling device provided by an embodiment of the present utility model;

[0034] Figure 4 A front view of a cooling device provided by an embodiment of the present utility model;

[0035] Figure 5 A front view of a cooling device provided by an embodiment of the present utility model (excluding the packaging component);

[0036] Figure 6 is Figure 5 an enlarged view of part A in

[0037] Figure 7 A schematic view of a phase change block of a cooling device provided by an embodiment of the present utility model;

[0038] Figure 8 A schematic view of a phase change block of another cooling device provided by an embodiment of the present utility model;

[0039] Figure 9 A schematic view of a phase change block of yet another cooling device provided by an embodiment of the present utility model;

[0040] Figure 10 Schematic diagram of the deformation of the phase change block of a cooling device provided by an embodiment of the present utility model;

[0041] Figure 11 Schematic diagram of the deformation of the phase change block of another cooling device provided by an embodiment of the present utility model;

[0042] Figure 12 Schematic diagram of the deformation of the phase change block of yet another cooling device provided by an embodiment of the present utility model.

[0043] Wherein:

[0044] 100, cooling device; 1, phase change structure; 11, phase change block; 111, phase change part; 112, elastic part; 2, packaging member; 3, encapsulation member; 31, air leakage area; 4, exhaust gap;

[0045] 200, battery cell; 201, exhaust passage. Detailed implementation manners

[0046] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model.

[0047] The following will describe the embodiments of the present application in detail. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0048] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally means that the related objects before and after are in an "or" relationship.

[0049] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0050] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0051] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0052] The embodiment of the present application provides a cooling device. The cooling device uses a phase change structure to cool the battery cells. On the basis of ensuring the efficiency of the cooling device for the battery cells, the phase change structure is coated by a packaging member, which improves the structural stability of the cooling device and ensures the thermal management effect and reliability of the battery cells.

[0053] Referring to Figures 1 to 3 , the cooling device provided by the present application is used to be arranged between adjacent battery cells, and the cooling device includes:

[0054] A phase change structure 1, the phase change structure 1 includes a plurality of phase change blocks 11, and the plurality of phase change blocks 11 are arranged at intervals in an array;

[0055] A plurality of packaging members 2, and the packaging members 2 correspondingly cover the phase change blocks 11;

[0056] An encapsulation member 3, the encapsulation member 3 encapsulates the outside of the plurality of packaging members 2, and an exhaust gap 4 is formed between adjacent phase change blocks.

[0057] In this embodiment, the plurality of phase change blocks 11 are arranged at intervals in an array. For example, the plurality of phase change blocks 11 are arranged in a rectangular array or a hexagonal array to ensure the heat absorption efficiency and liquid absorption balance of the plurality of phase change blocks 11 during the phase change process.

[0058] The cooling device is located between adjacent battery cells. When the battery cells generate heat or experience thermal runaway, the phase change structure 1 within the cooling device undergoes a phase change, and the gas after the phase change can be discharged through the exhaust gap 4 between the phase change blocks 11 to rapidly cool the overheated or thermally runaway battery cells, quickly reducing the temperature of the overheated or runaway area on the battery cells, thereby achieving the purpose of suppressing the thermal diffusion of the battery cells.

[0059] In this embodiment, the cooling device and the battery cells on both sides thereof form a "sandwich"-type multi-layer structure. The middle layer of the "sandwich"-type multi-layer structure is the cooling device including the phase change structure 1. The phase change structure 1 can be a hydrogel or an adsorbent structure, etc.; each phase change block 11 in the phase change structure 1 is coated with a packaging member 2. The material of the packaging member 2 can be expanded polytetrafluoroethylene (PTFE); the outside of the packaging member 2 is an encapsulation member 3, and the encapsulation member 3 can be made of polyethylene terephthalate (PET), polypropylene (PP) or an aluminum-plastic film.

[0060] In this embodiment, when multiple phase change blocks 11 in the phase change structure 1 are placed in zones and the packaging member 2 is correspondingly coated on the phase change blocks 11, the area of the packaging member 2 is increased, improving the steam discharge efficiency in the cooling device.

[0061] In this embodiment, multiple phase change blocks can also share a packaging member. For example, a large-area packaging member covers multiple phase change blocks, and the packaging member is partitioned between adjacent phase change blocks by hot pressing to achieve separate wrapping of each phase change block 11 by the partitioned packaging member. In other embodiments, a packaging member can also only coat one phase change block, which is beneficial to the protection of each phase change block and improves safety.

[0062] After the battery cell undergoes thermal runaway, the vaporization of the phase change blocks 11 in a local area will not push the non-vaporized phase change blocks 11 in other areas, thus realizing the spatial separation between the non-vaporized solid-phase, gel-phase and liquid-phase phase change blocks 11 and the gas-phase phase change blocks 11. When the gas-phase phase change blocks 11 are discharged, they will not push the non-vaporized phase change structure 1, ensuring that the non-vaporized phase change blocks 11 in the phase change structure 1 can still be distributed according to the initial layout manner after the thermal runaway of the battery cell.

[0063] The packaging member 2 realizes the spatial separation between the gas-phase phase change blocks 11 and the phase change blocks 11 in other phases. Specifically, multiple packaging members 2 are correspondingly coated on multiple phase change blocks 11. The packaging member 2 allows gas-phase particles to pass through, while liquid-phase or solid-phase particles cannot pass through. After the battery cell undergoes thermal runaway, the phase change blocks 11 are vaporized and enter the exhaust gap 4 through the packaging member 2, and then are discharged from the weak area of the encapsulation member 3. At this time, the non-vaporized phase change blocks 11 are still wrapped inside the packaging member 2 and can continue to play the role of cooling the battery cell.

[0064] Moreover, the vaporized phase change block 11 is discharged from between the package 3 and the package 2, and an air gap is formed between the package 3 and the package 2, which increases the heat transfer resistance between the cells and inhibits the heat transfer between the cells. It can dissipate heat in time for a single cell with excessive temperature rise, ensure the thermal management effect of the battery, and prevent the heat of a single thermal runaway cell from spreading to other cells.

[0065] In one embodiment, after the package 2 wraps the phase change block 11, the edges of the package 2 are hot pressed to ensure the integrity of the package 2 wrapping the phase change block 11; after the package 3 encapsulates multiple packages 2 wrapped with the phase change blocks 11, the edges of the package 3 are hot pressed to ensure the sealing of the cooling device.

[0066] In one embodiment, the cooling device includes two layers of packaging members 3. After a plurality of phase change blocks 11 are wrapped around the packaging member 2, they are first attached to a layer of packaging members 3 in an array, and then another layer of packaging member 3 is used to cover the plurality of phase change blocks 11 wrapped around the packaging member 2, and the edges of the two layers of packaging members 3 are hot pressed together.

[0067] In this embodiment, the phase change structure 1 absorbs heat through phase change after encountering heat to ensure the cooling rate of the cooling device on the battery cell; and the various phase change blocks 11 in the phase change structure 1 are independent of each other, which improves the structural stability of the cooling device and ensures the thermal management effect of the cooling device on the battery cell.

[0068] In one embodiment, see Figure 5 and Figure 6 , a plurality of phase change blocks 11 are arranged at intervals in a direction parallel to the extension direction of the battery cell;

[0069] In the extension direction of the battery cell, the gap size of the exhaust gap 4 is in the range of 1-3 mm. The extension direction of the battery cell may be one of the length direction of the battery cell, the width direction of the battery cell, and the height direction of the battery cell.

[0070] In this embodiment, after the phase change block 11 is heated and undergoes a phase change, the phase change gas can pass through the packaging and enter the exhaust gap 4. The phase change gas in the exhaust gap 4 stretches the packaging 2 and the packaging 3 to form an exhaust path from the exhaust gap 4 to the air leakage area on the packaging 3.

[0071] Specifically, when the phase change structure 1 encounters heat and absorbs the heat of the battery cell, the vaporized phase change block 11 is discharged from the exhaust gap 4, which can ensure the cooling effect of the cooling device on the battery cell; and the gap size of the exhaust gap 4 is directly related to the discharge efficiency of the vaporized phase change block 11. When the gap size of the exhaust gap 4 is too large, it will occupy the setting space of the phase change structure 1, resulting in a reduction in the amount of the phase change structure 1, thereby affecting the cooling effect; when the gap size of the exhaust gap 4 is too small, it will affect the discharge of the vaporized phase change block 11, resulting in a decrease in exhaust efficiency, and also reducing the cooling rate of the phase change structure 1.

[0072] In one embodiment, see Figure 4 , the package 3 is provided with a gas release area 31, and the exhaust gap 4 is connected to the gas release area 31;

[0073] When the air pressure in the exhaust gap 4 is greater than or equal to the set pressure, the air release area 31 can be opened to achieve external communication of the exhaust gap 4 .

[0074] In this embodiment, when the end of the package 3 is sealed by heat pressing, a bonding area and a weak area can be formed at the closed position of the package 3, and the bonding strength of the bonding area is greater than the bonding strength of the weak area; for example, a weak area is reserved at the end of the package 3 to form a degassing area 31 in the weak area. When the pressure in the internal space of the exhaust gap 4 reaches the set pressure, the degassing area 31 ruptures and can discharge the vaporized phase change block 11 to avoid excessive pressure inside the exhaust gap 4, and can facilitate the heated phase change block 11 to continue to vaporize after the vaporized phase change block 11 is discharged.

[0075] In one embodiment, see Figures 7 to 9 The phase change block 11 includes a phase change portion 111 and an elastic portion 112. The phase change portion 111 is suitable for phase change at a preset temperature. For example, the phase change portion 111 can vaporize when the temperature rises. The elastic portion 112 is embedded in the phase change portion 111 and is used to abut the battery cell.

[0076] In this embodiment, the phase change portion 111 in the phase change structure 1 can produce phase changes such as vaporization after the battery cell has thermal runaway, so as to take away the heat generated by the thermal runaway by absorbing heat during the phase change. On the one hand, it can avoid the risk of explosion and fire due to heat accumulation in the thermal runaway battery cell. On the other hand, it also reduces the amount of heat transferred from the runaway battery cell to its adjacent battery cells, thereby preventing the spread of heat.

[0077] The strength of the phase change part 111 in the phase change structure 1 decreases after heating and vaporization, and the battery cell will swell locally after thermal runaway, which makes it easy for the runaway battery cell to have point contact or surface contact with its adjacent battery cells, increasing the risk of thermal runaway of the adjacent battery cells. The phase change structure 1 provided in the embodiment of the present application places an elastic part 112 in the phase change part 111 to form an elastic frame, and the elastic part 112 is used to strengthen the support of the phase change part 111.

[0078] Specifically, after a battery cell experiences thermal runaway, the extrusion force generated by the expansion of the battery cell will also push the phase change block 11 in the phase change structure 1, causing the phase change portion 111 to be squeezed, while the elastic portion 112 can provide support for the phase change portion 111 to prevent the phase change portion 111 from being excessively squeezed. On the one hand, this can prevent the phase change portion 111 from being squeezed out, and on the other hand, the elastic portion 112 can abut against the battery cell, preventing the out-of-control battery cell from contacting adjacent battery cells, reducing the amount of heat transferred from the out-of-control battery cell to adjacent battery cells, and improving the safety of the battery cell.

[0079] In one embodiment, the elastic part 112 can deform following the temperature change.

[0080] In this embodiment, the elastic part 112 can bend and deform as the temperature rises, so that the elastic force of the elastic part 112 increases. When the battery cell generates heat and expands, the elastic part 112 can better resist the battery cell to avoid direct contact between adjacent battery cells.

[0081] In one embodiment, a phase change part 111 and an elastic part 112 are provided in each phase change block 11. The material of the elastic part 112 is a shape memory metal of nickel-titanium alloy, so that the elastic part 112 deforms after heating up, and the elastic coefficient of the elastic part 112 is increased.

[0082] In one embodiment, the elastic part 112 can deform when the temperature increases, so as to be abutted between two adjacent battery cells.

[0083] In this embodiment, when the battery cell does not generate heat and deform, the elastic part 112 is in the gap between adjacent battery cells and does not contact the battery cell. At this time, the phase change block 11 does not vaporize. After the battery cell generates heat and even gets out of control thermally, the heat generated by the battery cell causes the phase change part 111 to undergo a phase change. At the same time, the elastic part 112 undergoes stretching deformation to increase the elastic force, so that the elastic part 112 can provide a supporting force for the phase change part 111 to avoid the battery cell bulging and deforming to squeeze the phase change part 111; and the elastic part 112 supports between adjacent battery cells, which can prevent contact between the battery cells and inhibit heat diffusion between the battery cells.

[0084] In one embodiment, the elastic force of the elastic part 112 increases as the temperature increases.

[0085] In this embodiment, when the battery cell does not generate heat and deform, the elastic part 112 is in the gap between adjacent battery cells and contacts the battery cell. At this time, the phase change block 11 does not vaporize, and the abutting force between the elastic part 112 and the battery cell is small. After the battery cell generates heat and even gets out of control thermally, the heat generated by the battery cell causes the phase change part 111 to undergo a phase change. At the same time, the elastic force of the elastic part 112 increases, so that the elastic part 112 can provide a supporting force for the phase change part 111 and support between adjacent battery cells, and can prevent contact between the battery cells.

[0086] In one embodiment, the elastic part 112 is a shape memory metal part, and the deformation temperature of the shape memory metal part is greater than the freezing point temperature of the phase change part 111.

[0087] In this embodiment, the shape memory metal part can undergo stretching deformation after heating up, so that the elastic force of the shape memory metal part increases; when the battery cell does not generate heat and deform, the cooling device is in the gap between adjacent battery cells, and the phase change block 11 does not vaporize.

[0088] After the battery cell generates heat or even undergoes thermal runaway, the heat generated by the battery cell causes the phase change part 111 to undergo a phase change. For example, the phase change part 111 changes from a solid state to a liquid state, and the phase change part 111 changes from a liquid state to a gaseous state. The anti-deformation ability of the gaseous phase change part 111 decreases. At this time, the shape memory metal part reaches the deformation temperature, and the shape memory metal part undergoes stretching deformation to increase the elastic force, so that the shape memory metal part can provide a supporting force for the phase change part 111, preventing the battery cell from bulging and deforming and squeezing the phase change part 111; and the shape memory metal part is supported between adjacent battery cells, which can prevent contact between the battery cells and inhibit heat diffusion between the battery cells.

[0089] In one embodiment, the deformation temperature of the shape memory metal part is greater than the freezing point temperature of the phase change part 111, and the difference range between the deformation temperature of the shape memory metal part and the freezing point temperature of the phase change part 111 is 10°C - 30°C.

[0090] In this embodiment, when the heat generated by the battery cell causes the phase change part 111 to undergo a phase change, for example, after the phase change part 111 changes from a solid state to a liquid state and then to a gaseous state, the anti-deformation ability of the gaseous phase change part 111 decreases, and the stretching deformation of the shape memory metal part can be used to support the phase change part 111.

[0091] When the deformation temperature of the shape memory metal part is lower than the freezing point temperature of the phase change part 111 or the difference from the freezing point temperature of the phase change part 111 is less than 10°C, there will be a problem that the shape memory metal part deforms before the phase change of the phase change part 111. At this time, the phase change part 111 fixes the shape memory metal part, which not only is not conducive to the deformation of the shape memory metal part but also easily causes damage to the phase change part 111; when the deformation temperature of the shape memory metal part is higher than the freezing point temperature of the phase change part 111 and the difference from the freezing point temperature of the phase change part 111 is greater than 30°C, there will be a problem that the shape memory metal part still cannot deform after the phase change of the phase change part 111, resulting in the shape memory metal part being unable to provide effective support after the phase change of the phase change part 111.

[0092] In one embodiment, see Figures 10 to 12 , the shape of the shape memory metal part is net-shaped, flat-plate-shaped or spiral-shaped.

[0093] In this embodiment, the elastic part 112 of the shape memory metal part structure is arranged in the phase change part 111 before the phase change part 111 solidifies and forms. After the phase change part 111 solidifies and forms, it forms an integral phase change structure with the shape memory metal part. The elastic part 112 can bend and deform with the increase in temperature. See Figure 7 and Figure 10 , the shape memory metal part is a net-shaped shape memory metal part formed by multiple wavy metal wires. The bending degree of the wavy metal wires increases with the increase in temperature to improve the elastic force of the shape memory metal part; see Figure 11, the shape memory metal part is a flat metal sheet, which can be bent and deformed after heating to increase the elastic force of the shape memory metal part; see Figure 12 , the shape memory metal part is a spiral metal spring, which can be stretched and deformed after heating to increase the elastic force of the shape memory metal part.

[0094] In this embodiment, the bending deformation of the shape memory metal part when heated makes it impossible for adjacent battery cells to come into contact, avoiding heat transfer between adjacent battery cells.

[0095] In one embodiment, the packaging member 2 is a breathable member. Further, the packaging member 2 is provided with ventilation holes. The diameter of the liquid droplets of the liquid phase of the phase change part 111 is D, and the pore diameter range of the ventilation holes is 1 / 2D - 4 / 5D.

[0096] In this embodiment, the phase change part 111 can be in a liquid state when no phase change occurs. At this time, the phase change part 111 is composed of a plurality of liquid droplets, and the diameter of the liquid droplets is D; the phase change part 111 can be in a gaseous state when a phase change occurs, so that the gaseous phase change gas can be discharged from the exhaust gap.

[0097] In another embodiment, the packaging member can also be a waterproof member.

[0098] In one embodiment, the phase change part 111 is a hydrogel, the minimum diameter of the water droplets is 20μm, and the diameter of the water vapor is 0.0004μm. To improve the exhaust efficiency of the packaging member 2, the pore diameter of the ventilation holes on the packaging member 2 can be adjusted to 10μm - 16μm.

[0099] In one embodiment, the phase change part 111 is paraffin wax. The pore diameter of the ventilation holes on the packaging member 2 can be adjusted to 1 / 2 - 4 / 5 of the diameter of the liquid paraffin droplets to improve the efficiency of the gaseous phase change part 111 discharged from the packaging member 2.

[0100] See Figure 1 and Figure 2 , the embodiment of the present application provides a battery pack, which includes a plurality of battery cells 200 and the above-mentioned cooling device 100;

[0101] The cooling device 100 is arranged in the assembly gap between adjacent battery cells 200.

[0102] In this embodiment, the cooling device includes a phase change structure 1, the phase change structure 1 includes a plurality of phase change blocks 11, and the plurality of phase change blocks 11 are arranged at intervals in an array; a plurality of packaging members 2, and the packaging members 2 correspondingly cover the phase change blocks 11; a packaging member 3, and the packaging member 3 is packaged outside the plurality of packaging members 2. An exhaust gap 4 is formed between adjacent phase change blocks. The phase change structure 1 absorbs heat through phase change to ensure the cooling rate of the cooling device for the battery cell; moreover, each phase change block 11 in the phase change structure 1 is independently arranged through the packaging member 2, improving the structural stability of the cooling device and ensuring the thermal management effect of the cooling device on the battery cell.

[0103] In one embodiment, the battery cell 200 is a strip-shaped blade battery cell. In the structure where a plurality of battery cells 200 are arranged side by side, a cooling device can be arranged between any two adjacent battery cells 200, or two, three, or four consecutive battery cells 200 can form a battery cell group, and a cooling device is arranged between adjacent battery cell groups.

[0104] In one embodiment, see Figure 1 , in the arrangement direction of adjacent battery cells 200, the projected area of the cooling device 100 on the battery cell 200 is smaller than the area of the battery cell 200 to form an exhaust passage 201 on the periphery of the assembly gap.

[0105] In this embodiment, the cooling device 100 can be arranged at the middle position of the assembly gap, and the height dimension of the cooling device 100 is smaller than the height dimension of the battery cell to reserve an exhaust passage for the cooling device 100 in the assembly gap between adjacent battery cells 200.

[0106] In one embodiment, the battery pack includes an upper cover plate and a lower cold plate. The upper cover plate covers the battery cell 200, and the lower cold plate is attached to the bottom of the battery cell 200. The gap between the cooling device 100 and the upper cover plate forms an exhaust passage, and an exhaust passage is also formed in the gap between the cooling device 100 and the lower cold plate, so that the vaporized phase change part in the cooling device 100 can be quickly discharged from the battery pack.

[0107] In one embodiment, in the height direction of the battery pack, the ratio range of the size of the exhaust passage 201 to the size of the battery cell is 1 / 100 - 3 / 100. For example, if the height of the battery cell is 100 mm, the height dimension of the exhaust passage can be set between 1 - 3 mm to facilitate the discharge of the gas after phase change from the exhaust passage on the basis of ensuring the setting space of the battery cell and improving the cooling rate of the cooling device 100 for the battery cell.

[0108] The embodiment of the present application provides an electrical device, and the electrical device includes the above-mentioned battery pack. Exemplarily, the electrical device can be a vehicle.

[0109] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A cooling device, used to be arranged between adjacent battery cells, characterized in that: include: A phase change structure (1), the phase change structure (1) comprising a plurality of phase change blocks (11), the plurality of phase change blocks (11) being arranged at intervals in an array; A plurality of packaging members (2), wherein the packaging members (2) are respectively coated on the phase change blocks (11); A packaging member (3), wherein the packaging member (3) is packaged outside the plurality of packaging members (2), and an exhaust gap (4) is formed between adjacent phase change blocks (11).

2. The cooling device according to claim 1, characterized in that: The plurality of phase change blocks (11) are arranged at intervals in a direction parallel to the extension of the battery core; In the extension direction of the battery core, the gap size of the exhaust gap (4) is in the range of 1-3 mm.

3. The cooling device according to claim 1, characterized in that: The packaging component (3) is provided with a gas discharge area (31), and the gas discharge gap (4) is connected to the gas discharge area (31); When the air pressure in the exhaust gap (4) is greater than or equal to a set pressure, the air release area (31) can be opened to enable the exhaust gap (4) to communicate with the outside.

4. The cooling device according to claim 1, characterized in that: The phase change block (11) comprises a phase change portion (111) and an elastic portion (112); the phase change portion (111) is suitable for phase change at a preset temperature; and the elastic portion (112) is embedded in the phase change portion (111).

5. The cooling device according to claim 4, characterized in that: The elastic portion (112) is capable of deforming in response to temperature changes.

6. The cooling device according to claim 5, characterized in that: The elastic portion (112) can be deformed when the temperature increases, so as to be used for abutting between two adjacent battery cells.

7. The cooling device according to claim 5, characterized in that: The elastic force of the elastic portion (112) increases as the temperature increases.

8. The cooling device according to claim 5, characterized in that: The elastic part (112) is a memory metal part, and the deformation temperature of the memory metal part is greater than the solidification point temperature of the phase change part (111).

9. The cooling device according to claim 8, characterized in that: The difference between the deformation temperature of the memory metal part and the solidification point temperature of the phase change part (111) is in the range of 10°C to 30°C.

10. The cooling device according to claim 8, characterized in that The shape of the memory metal part is a mesh, a flat plate or a spiral.

11. The cooling device according to claim 1, characterized in that: The packaging piece is a breathable piece.

12. The cooling device according to claim 4, characterized in that: The packaging (2) has ventilation holes, the diameter of the liquid phase droplets of the phase change portion (111) is D, and the aperture range of the ventilation holes is 1 / 2D-4 / 5D.

13. A battery pack, characterized in that: Comprising a plurality of battery cells (200) and a cooling device (100) according to any one of claims 1 to 12; The cooling device (100) is arranged in an assembly gap between adjacent battery cells (200).

14. The battery pack according to claim 13, characterized in that: Along the arrangement direction of adjacent battery cells (200), the orthographic projection area of ​​the cooling device (100) on the battery cells (200) is smaller than the area of ​​the battery cells (200), so as to form an exhaust channel (201) around the assembly gap.

15. The battery pack according to claim 14, characterized in that: In the height direction of the battery pack, the ratio of the size of the exhaust channel (201) to the size of the battery cell (200) is in the range of 0.01-0.

03.

16. An electrical equipment, characterized in that: A battery pack comprising any one of claims 13-15.

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