Heat-absorbing member and preparation method therefor, battery assembly and electric apparatus

Abstract

Provided in the present application are a heat-absorbing member and a preparation method therefor, a battery assembly and an electric apparatus. The heat-absorbing member comprises a water-containing heat-absorbing material, a thermally conductive insulating oil and an encapsulation structure, wherein the water-containing heat-absorbing material and the thermally conductive insulating oil are encapsulated in the encapsulation structure, and the water-containing heat-absorbing material is at least partially immersed in the thermally conductive insulating oil. The heat-absorbing member has relatively good heat absorption capacity, and the thermally conductive insulating oil can further inhibit the evaporation of moisture, thereby retaining water, and also suppressing phenomena such as a short circuit or self-discharge in a battery assembly caused by moisture leakage.

Description

Heat-absorbing components and their preparation methods, battery modules and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411029714.5, filed on July 29, 2024, entitled "Heat-absorbing element and preparation method, battery assembly and electrical device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a heat-absorbing element and its preparation method, a battery assembly, and an electrical device. Background Technology

[0003] Batteries provide power for electrical devices, and temperature changes during battery use affect the performance and safety of both the battery and the device. Currently, thermal insulation materials are used to reduce heat transfer between adjacent batteries, ensuring the device's usability. In related technologies, water-containing heat-absorbing materials (such as hydrogels and hydrates) can be used. However, the gradual loss of water, freezing at low temperatures, and moisture from evaporation and leakage of these materials during use can easily cause short circuits or self-discharge in the battery, severely impacting its normal operation. Summary of the Invention

[0004] In view of this, this application provides a heat-absorbing element and its preparation method, a battery assembly and an electrical device. The heat-absorbing element can suppress the evaporation of moisture and, while retaining water, suppress moisture leakage that could lead to short circuits or self-discharge within the battery assembly.

[0005] In a first aspect, this application provides a heat-absorbing component, which includes an aqueous heat-absorbing material, a thermally conductive insulating oil, and an encapsulation structure. The aqueous heat-absorbing material and the thermally conductive insulating oil are encapsulated within the encapsulation structure, and the aqueous heat-absorbing material is at least partially immersed in the thermally conductive insulating oil.

[0006] Optionally, the aqueous heat-absorbing material comprises at least one of a hydrogel heat-absorbing material and a hydrate.

[0007] Optionally, the hydrogel heat-absorbing material comprises 5 wt% to 10 wt% of a polymer backbone, 10 wt% to 20 wt% of a polyol, and 70 wt% to 85 wt% of water, wherein the polyol has a freezing point of -30°C to -10°C.

[0008] Optionally, the hydrate includes at least one of crystalline hydrate salt and oxalic acid dihydrate.

[0009] Optionally, the polyol includes at least one of ethylene glycol and glycerol.

[0010] Optionally, the polymer backbone includes polyacrylamide.

[0011] Optionally, the thermally conductive insulating oil includes dimethyl silicone oil.

[0012] Optionally, the thickness of the water-containing heat-absorbing material is 0.3 mm to 10 mm.

[0013] Optionally, the material of the encapsulation structure includes at least one of polyethylene terephthalate and aluminum-plastic film.

[0014] Optionally, the encapsulation structure has an internal accommodating space, in which the water-containing heat-absorbing material is disposed, and the ratio of the volume of the water-containing heat-absorbing material to the volume of the accommodating space is 80% to 90%.

[0015] Secondly, this application provides a method for preparing a heat-absorbing element, comprising encapsulating an aqueous heat-absorbing material and a thermally conductive insulating oil in an encapsulation structure, wherein the thermally conductive insulating oil immerses at least a portion of the aqueous heat-absorbing material to form the heat-absorbing element described in the first aspect.

[0016] Optionally, the aqueous heat-absorbing material comprises at least one of a hydrogel heat-absorbing material and a hydrate.

[0017] Optionally, the preparation method of the hydrogel heat-absorbing material includes mixing polyacrylamide, polyol, water and crosslinking agent evenly, and obtaining the hydrogel heat-absorbing material through a crosslinking reaction.

[0018] Thirdly, this application provides a battery assembly including a battery and the heat-absorbing element described in the first aspect, wherein the heat-absorbing element is disposed on the surface of the battery.

[0019] Fourthly, this application provides an electrical device including the battery assembly described in the third aspect.

[0020] The water-containing heat-absorbing material in the heat-absorbing component provided in this application uses water as a phase change component, which has a large latent heat of vaporization, giving it good heat absorption performance. The water-containing heat-absorbing material is at least partially immersed in thermally conductive insulating oil, which can inhibit water evaporation and prevent water leakage from causing short circuits or self-discharge in the battery module. The heat-absorbing component has excellent heat absorption and safety performance, which is beneficial for its use in batteries and electrical equipment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0022] Figure 1 is a cross-sectional schematic diagram of a heat-absorbing element provided in one embodiment of this application;

[0023] Figure 2 is a flowchart of the preparation method of the heat-absorbing element provided in one embodiment of this application;

[0024] Figure 3 is a cross-sectional schematic diagram of a battery assembly provided in one embodiment of this application;

[0025] Figure 4 is a perspective view of a battery assembly provided in one embodiment of this application. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] Please refer to Figure 1, which is a cross-sectional schematic diagram of a heat-absorbing component provided in one embodiment of this application. The heat-absorbing component 100 includes an aqueous heat-absorbing material 10, a thermally conductive insulating oil 30, and an encapsulation structure 20. The aqueous heat-absorbing material 10 and the thermally conductive insulating oil 30 are encapsulated within the encapsulation structure 20, and the aqueous heat-absorbing material 10 is at least partially immersed in the thermally conductive insulating oil 30. In the heat-absorbing component of this application, the aqueous heat-absorbing material uses water as a phase change component, which has a large latent heat of vaporization, giving it good heat absorption performance. Compared with thermally insulating aerogel, the aqueous heat-absorbing material utilizes the latent heat of vaporization of water to achieve excellent heat absorption, effectively preventing heat transfer. The aqueous heat-absorbing material is immersed in the thermally conductive insulating oil, which can inhibit water evaporation and, while retaining water, prevent water leakage that could lead to short circuits or self-discharge within the battery assembly. Therefore, the aqueous heat-absorbing material provided in this application combines heat absorption capacity, water retention capacity, and safety, exhibiting excellent overall performance and making it suitable for use in batteries and electrical devices.

[0028] The aqueous heat-absorbing material of this application may include known materials that use water as the primary phase change heat-absorbing medium. In one embodiment of this application, the aqueous heat-absorbing material comprises at least one of a hydrogel heat-absorbing material and a hydrate. The hydrate includes at least one of a crystalline hydrated salt and oxalic acid dihydrate.

[0029] In one embodiment of this application, the hydrogel heat-absorbing material includes a polymer backbone, a polyol, and water.

[0030] In hydrogel heat-absorbing materials, water acts as a phase change component. Water has a large latent heat of vaporization, which can absorb a large amount of heat, giving the hydrogel heat-absorbing material good heat absorption performance. The polymer skeleton acts as a carrier for water and polyol, ensuring the water content and mechanical strength of the hydrogel heat-absorbing material. At the same time, hydrogen bonds can be formed between polyol and water, inhibiting the volatilization of water in the hydrogel heat-absorbing material and improving its water retention capacity. Furthermore, polyol has a low freezing point, which can lower the overall freezing point of the hydrogel heat-absorbing material, thereby inhibiting the volume expansion caused by freezing at low temperatures and improving the freeze resistance of the hydrogel heat-absorbing material.

[0031] In this application, the hydrogel heat-absorbing material contains water with a large latent heat of vaporization. As a phase change component, water enables the hydrogel heat-absorbing material to absorb a large amount of heat during use, resulting in excellent heat absorption performance. Water is the main component of the hydrogel heat-absorbing material, thus ensuring its heat absorption performance. In one embodiment of this application, the water content in the hydrogel heat-absorbing material is greater than or equal to 70 wt%, thereby ensuring the water content and improving its heat absorption effect. Specifically, the water content in the hydrogel heat-absorbing material can be, but is not limited to, 70 wt% or more, 72 wt% or more, 75 wt% or more, 77 wt% or more, 78 wt% or more, 80 wt% or more, 81 wt% or more, 83 wt% or more, etc. In one embodiment of this application, the water content in the hydrogel heat-absorbing material is 70 wt% to 85 wt%, which ensures both the water content and heat absorption effect of the hydrogel heat-absorbing material, while also ensuring the content of other components, which is beneficial for further improving the performance of the hydrogel heat-absorbing material. Specifically, the water content in hydrogel heat-absorbing materials can be, but is not limited to, 70wt%, 72wt%, 73wt%, 75wt%, 78wt%, 80wt%, 83wt%, 84wt%, 85wt%, etc.

[0032] The polymer skeleton in the hydrogel heat-absorbing material of this application is used to load liquid water and polyol. When the liquid water absorbs heat and turns into a gaseous state, it can be released from the polymer skeleton. When the gaseous water cools and turns back into liquid water, it can be reloaded into the polymer skeleton, ensuring the heat absorption performance and cooling effect of the hydrogel heat-absorbing material. In one embodiment of this application, the polymer skeleton in the hydrogel heat-absorbing material has a three-dimensional network structure, with water dispersed and loaded within this three-dimensional network structure. In one embodiment of this application, the polymer skeleton includes polyacrylamide. In one embodiment of this application, the content of the polymer skeleton in the hydrogel heat-absorbing material is 5wt% to 10wt%, which is beneficial for water loading in the hydrogel heat-absorbing material. Furthermore, an appropriate amount of polymer skeleton results in better mechanical strength and a certain compressive strength in the hydrogel heat-absorbing material. Specifically, the content of the polymer skeleton in the hydrogel heat-absorbing material can be, but is not limited to, 5wt%, 5.5wt%, 6wt%, 7wt%, 8wt%, 8.5wt%, 9wt%, or 10wt%.

[0033] Polyols refer to alcohols containing two or more hydroxyl groups in their molecules. In this application, the polyols can form hydrogen bonds with water, inhibiting water volatilization, ensuring the water content and structural stability of the hydrogel heat-absorbing material, improving its water retention capacity, and thus ensuring its heat absorption effect. At low temperatures, especially below zero, liquid water solidifies, leading to an increase in volume. The addition of low-freezing-point polyols forms hydrogen bonds with water, disrupting the hydrogen bond structure between water molecules, increasing the intermolecular distance, and making it difficult for ice crystals to form. Furthermore, the polyols can inhibit the continued expansion of ice crystals, thereby suppressing and slowing down ice formation, thus improving the antifreeze effect of the hydrogel heat-absorbing material. This prevents the hydrogel heat-absorbing material from being compressed due to volume expansion when used at low temperatures, thereby improving its safety. It is understood that polyols are soluble in water. In one embodiment of this application, the polyol is liquid at 25°C, which is beneficial for the preparation of the hydrogel heat-absorbing material.

[0034] The freezing point of a polyol refers to the temperature at which it solidifies. In one embodiment of this application, the freezing point of the polyol is -30℃ to -10℃, which can improve the antifreeze ability of the hydrogel heat-absorbing material and meet practical application requirements. Specifically, the freezing point of the polyol may be, but is not limited to, -26℃ to -13℃, -25℃ to -15℃, -25℃ to -20℃, -20℃ to -15℃, or -15℃ to -10℃, etc. In one embodiment of this application, the polyol includes at least one of ethylene glycol and glycerol. Ethylene glycol has a freezing point of -12.9°C and a viscosity of 16.9 mPa·s at 25°C. Glycerol has a freezing point of -18.3°C and a viscosity of 945 mPa·s at 25°C. Glycerol has a lower freezing point, but its viscosity is too high. Using it in combination with ethylene glycol can appropriately reduce the viscosity, which can ensure the mechanical strength of the hydrogel and the antifreeze ability of the hydrogel heat-absorbing material. At the same time, ethylene glycol and glycerol have good compatibility with other components of the hydrogel heat-absorbing material, which is beneficial to the preparation and use of the hydrogel heat-absorbing material.

[0035] In one embodiment of this application, the polyol content in the hydrogel heat-absorbing material is 10wt% to 20wt%, which is beneficial for increasing the water content and water retention capacity of the hydrogel heat-absorbing material, and also helps to improve the antifreeze ability of the hydrogel heat-absorbing material. Specifically, the polyol content in the hydrogel heat-absorbing material can be, but is not limited to, 10wt%, 13wt%, 15wt%, 16wt%, 17wt%, 19wt%, or 20wt%.

[0036] In one embodiment of this application, the content of ethylene glycol in the hydrogel heat-absorbing material is less than or equal to 10 wt%. Specifically, the content of ethylene glycol in the hydrogel heat-absorbing material may be, but is not limited to, 1 wt%, 2 wt%, 2.5 wt%, 3 wt%, 4 wt%, 5 wt%, 5.5 wt%, 6 wt%, 7 wt%, 8 wt%, 8.5 wt%, 9 wt%, or 10 wt%. In another embodiment of this application, the content of glycerol in the hydrogel heat-absorbing material is less than or equal to 10 wt%. Specifically, the content of glycerol in the hydrogel heat-absorbing material may be, but is not limited to, 1 wt%, 2 wt%, 2.5 wt%, 3 wt%, 4 wt%, 5 wt%, 5.5 wt%, 6 wt%, 7 wt%, 8 wt%, 8.5 wt%, 9 wt%, or 10 wt%.

[0037] In one embodiment of this application, the hydrogel heat-absorbing material comprises 5 wt% to 10 wt% of a polymer backbone, 10 wt% to 20 wt% of a polyol and 70 wt% to 85 wt% of water, thereby improving the overall performance of the hydrogel heat-absorbing material.

[0038] The hydrogel heat-absorbing material of this application is immersed in thermally conductive insulating oil to suppress moisture evaporation and improve water retention. In one embodiment of this application, the thermally conductive insulating oil includes dimethyl silicone oil. Dimethyl silicone oil has a high boiling point (155℃~220℃) and is immiscible with water and polyols (such as ethylene glycol and glycerol). Immersing the hydrogel heat-absorbing material in dimethyl silicone oil can further suppress moisture evaporation, thus preventing moisture leakage that could lead to short circuits or self-discharge within the battery module while retaining water.

[0039] The encapsulation structure in the heat-absorbing component serves to seal and house the heat-absorbing structure and the thermally conductive insulating oil. In one embodiment of this application, the encapsulation structure is made of at least one of polyethylene terephthalate (PET) and aluminum-plastic film. Encapsulation structures made of PET and / or aluminum-plastic film are relatively thin and lightweight, providing good moisture barrier and sealing performance. This not only reliably encapsulates the heat-absorbing structure but also reduces the overall weight of the heat-absorbing component, which is beneficial for its use. In one embodiment of this application, the encapsulation structure is made of aluminum-plastic film. Aluminum-plastic film is a composite structure comprising aluminum foil and plastic film.

[0040] In one embodiment of this application, the encapsulation structure has an internal accommodating space, in which a water-containing heat-absorbing material is disposed. The ratio of the volume of the water-containing heat-absorbing material to the volume of the accommodating space is 80% to 90%. This ensures the content of the water-containing heat-absorbing material in the heat-absorbing element, thereby guaranteeing the heat absorption performance of the heat-absorbing element. Simultaneously, it also provides space for the vaporization of water during the heat absorption process, thus improving the service life of the heat-absorbing element. Specifically, the ratio of the volume of the water-containing heat-absorbing material to the volume of the accommodating space can be, but is not limited to, 80%, 82%, 84%, 86%, 88%, 90%, etc.

[0041] In this application, the dimensions of the encapsulation structure and the water-containing heat-absorbing material can be set according to the usage requirements of the heat-absorbing component. In one embodiment of this application, the thickness of the water-containing heat-absorbing material is 0.3mm to 10mm, which ensures the heat absorption performance of the heat-absorbing component without excessively increasing its weight and volume, thus facilitating its use. Specifically, the thickness of the water-containing heat-absorbing material can be, but is not limited to, 0.3mm, 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0042] This application provides a method for preparing a heat-absorbing component, which includes encapsulating an aqueous heat-absorbing material and a thermally conductive insulating oil in an encapsulation structure, wherein the thermally conductive insulating oil immerses at least a portion of the aqueous heat-absorbing material to form the aforementioned heat-absorbing component.

[0043] In one embodiment of this application, the method for preparing the hydrogel heat-absorbing material includes mixing polyacrylamide, polyol, water, and a crosslinking agent uniformly, and then performing a crosslinking reaction to obtain the hydrogel heat-absorbing material. Specifically, the uniformly mixed polyacrylamide, polyol, water, and crosslinking agent can be poured into a mold, such as a rectangular mold, to carry out the crosslinking reaction.

[0044] Please refer to Figure 2, which is a flowchart of a method for preparing a heat-absorbing element according to an embodiment of this application, including:

[0045] S101: Polyacrylamide, polyol, water and crosslinking agent are mixed evenly and crosslinked to obtain hydrogel heat-absorbing material.

[0046] S102: The hydrogel heat-absorbing material is encapsulated with an encapsulation material to form a pocket structure.

[0047] S103: Inject thermally conductive insulating oil into the pocket structure and immerse at least part of the hydrogel heat-absorbing material.

[0048] S104: Seal the pocket structure to form an encapsulation structure to obtain a heat-absorbing component.

[0049] This application provides a battery assembly, including a battery and a heat-absorbing element as described in any of the above embodiments, wherein the heat-absorbing element is disposed on the surface of the battery. In related technologies, aerogel spacers are used between batteries to block heat transfer after the battery heats up; however, this method is costly and still presents safety issues, while also affecting the usability of the battery assembly. This application, by placing a heat-absorbing element on the battery surface, can block heat transfer when thermal runaway occurs, fundamentally suppressing the impact of thermal runaway and reducing its severity. Furthermore, the thermally conductive insulating oil can inhibit moisture evaporation, retaining water while preventing leakage that could lead to short circuits or self-discharge within the battery assembly, thus improving the safety of the battery assembly. In this application, the heat-absorbing element can be directly or indirectly attached to the battery, and the battery assembly can be a battery pack or a battery module.

[0050] The number of batteries in the battery assembly can be selected according to usage needs, such as one, two, three, four, seven, ten, etc. In one embodiment of this application, the battery assembly includes at least two batteries 200, and a heat-absorbing element 100 is disposed between at least two batteries 200 and parallel to their large surface. The large surface of the battery is the plane containing the battery's length and width directions. Please refer to Figure 3, a cross-sectional schematic diagram of the battery assembly provided in one embodiment of this application, and Figure 4, a perspective schematic diagram of the battery assembly provided in one embodiment of this application, wherein the battery assembly 300 includes multiple batteries 200, and the heat-absorbing element 100 is disposed between two adjacent batteries 200, thereby further reducing the heat generated during the operation of the battery assembly and improving the operational safety of the battery assembly.

[0051] This application provides an electrical device including the battery module described in any of the above embodiments. The electrical device provided by this application boasts excellent performance and lifespan, making it highly competitive. Specifically, the electrical device can refer to vehicles, electronic devices, energy storage systems, etc.

[0052] The effects of the technical solution in this application will be further illustrated below with specific examples.

[0053] Example 1

[0054] A heat-absorbing component comprises a hydrogel heat-absorbing material, a thermally conductive insulating oil, and an encapsulation structure. The hydrogel heat-absorbing material is composed of 5 wt% polyacrylamide, 9 wt% ethylene glycol, 1 wt% glycerol, a small amount (~0.25 wt%) of N,N-methylenebisacrylamide, and ~85 wt% ultrapure water, uniformly mixed and poured into a rectangular mold, then allowed to solidify for 2-3 hours. An aluminum-plastic film is used as the encapsulation material to seal three sides of the hydrogel heat-absorbing material, forming a pocket structure. An appropriate amount of dimethyl silicone oil is poured in, just enough to submerge the hydrogel heat-absorbing material, leaving a certain space to ensure that the hydrogel heat-absorbing material occupies 80% of the volume of the container. The opening is then sealed to form the heat-absorbing component.

[0055] Examples 2-7

[0056] This is basically the same as Example 1, except that the mass percentage W of the polymer skeleton in the hydrogel heat-absorbing material is different. 聚合物 , mass percentage of ethylene glycol W 乙二醇 glycerol mass percentage W 丙三醇 Water mass percentage W 水 and the volume ratio V of the hydrogel heat-absorbing material in the accommodating space. 容置 The differences are detailed in Table 1.

[0057] Example 8

[0058] A heat-absorbing component comprises a hydrate, a thermally conductive insulating oil, and an encapsulation structure. The hydrate is selected as sodium sulfate decahydrate (Na₂SO₄·10H₂O). One end of an aluminum-plastic film is laid in a rectangular mold. Sodium sulfate decahydrate is then evenly spread on the aluminum-plastic film, controlling the hydrate layer thickness to be 4 / 5 of the mold height. Dimethyl silicone oil is then poured into the mold, just enough to submerge the hydrate layer. The other end of the aluminum-plastic film is then folded in half, sealing three sides to form the desired heat-absorbing component.

[0059] Comparative Example 1

[0060] It is basically the same as Example 1, except that it is not immersed in thermally conductive insulating oil, as detailed in Table 1.

[0061] Comparative Example 2

[0062] It is basically the same as Example 8, except that it is not immersed in thermally conductive insulating oil, as detailed in Table 2.

[0063] Table 1. Configuration of hydrogel heat absorbers

[0064] Table 2. Installation of hydrate heat absorbers

[0065] Performance testing

[0066] Water retention capacity test: Place the above heat absorber in a 45℃ oven for one week, record the initial mass and the final mass, taking the initial mass as 100%, and calculate the ratio W of the mass of the heat absorber after one week to the initial mass of the heat absorber. 剩余 This reflects the water retention capacity of the heat-absorbing component.

[0067] Freeze-thaw resistance test: Measure the solidification temperature t of the hydrogel heat-absorbing material in the above-mentioned heat-absorbing component. 凝固 This reflects its ability to withstand freezing.

[0068] Heat absorption capacity test: Set up a bare battery pack (the bare battery pack includes batteries A1, A2 and A3 arranged in sequence) and a battery pack with the above-mentioned heat absorption components (the battery pack includes batteries B1, B2 and B3 arranged in sequence, with heat absorption components placed between batteries B1 and B2, and between batteries B2 and B3). After charging is completed (100% SOC), both are discharged simultaneously at a current density of 6C. The temperatures T1 and T2 of the single cells (i.e., batteries A2 and B2) in the bare battery pack and the battery pack with heat absorption components are recorded by a temperature sampler. ΔT = T1 - T2, which reflects the heat absorption capacity of the heat absorption components.

[0069] Mechanical strength test: The hydrogel heat-absorbing material in the heat-absorbing component is cut into a suitable size (8mm in diameter and 10mm in thickness). Using an electronic universal testing machine, the deformation rate is set to 5% / min and compressed to 2mm. The hydrogel heat-absorbing material is then tested, and the maximum compressive strength P is recorded to reflect its compressive strength.

[0070] The performance test results are shown in Table 3.

[0071] Table 3 Performance test results

[0072] As can be seen from Tables 1 and 2, in Comparative Example 1, no thermally conductive insulating oil was added, and after the water retention capacity test, W... 剩余 The water retention value was low, indicating poor water retention. However, thermally conductive insulating oil was added in Examples 1-7, and the water retention capacity was improved after testing. 剩余The high water retention value and excellent water retention effect indicate that the presence of thermally conductive insulating oil can significantly inhibit water evaporation and enhance the water retention capacity of the heat absorber. Meanwhile, the hydrogel heat absorber materials used in Examples 1-7 exhibit good antifreeze properties, heat absorption properties, and mechanical strength, which is beneficial for the use of the heat absorber. Example 8 and Comparative Example 2 used sodium sulfate decahydrate as the main heat absorber material. The water retention and heat absorption capacities of these two heat absorbers were compared. It can be seen that the thermally conductive insulating oil can greatly inhibit the water loss of hydrates, improving the water retention capacity of the heat absorber without affecting its heat absorption capacity.

Claims

1. A heat absorbing member characterized by comprising: The heat absorption member comprises a water-containing heat absorption material, a heat-conducting insulating oil, and a packaging structure, the water-containing heat absorption material and the heat-conducting insulating oil are packaged in the packaging structure, and the water-containing heat absorption material is at least partially immersed in the heat-conducting insulating oil.

2. The heat absorbing member according to claim 1, wherein The water-containing heat absorption material comprises at least one of a hydrogel heat absorption material and a hydrate.

3. The heat absorbing member according to claim 2, wherein The hydrogel heat absorption material comprises 5wt%-10wt% of a polymer skeleton, 10wt%-20wt% of a polyhydric alcohol, and 70wt%-85wt% of water, the polyhydric alcohol has a freezing point of-30℃ to-10℃; and / or The hydrate comprises at least one of a crystalline hydrated salt and oxalic acid dihydrate.

4. The heat absorbing member according to claim 3, wherein The polyhydric alcohol comprises at least one of ethylene glycol and glycerol.

5. The heat absorbing member according to claim 3, wherein The polymer skeleton comprises polyacrylamide.

6. The heat absorbing member according to claim 1, wherein The heat-conducting insulating oil comprises dimethyl silicone oil.

7. The heat absorbing member according to claim 1, wherein The thickness of the water-containing heat absorption material is 0.3mm-10mm.

8. The heat absorbing member according to claim 1, wherein The material of the packaging structure comprises at least one of polyethylene terephthalate and aluminum plastic film.

9. The heat absorbing member according to claim 1, wherein The packaging structure has an accommodation space inside, the water-containing heat absorption material is arranged in the accommodation space, and the ratio of the volume of the water-containing heat absorption material to the volume of the accommodation space is 80%-90%.

10. A method for producing a heat absorbing member, characterized by, The method comprises packaging a water-containing heat absorption material and a heat-conducting insulating oil in a packaging structure, the heat-conducting insulating oil immerses at least part of the water-containing heat absorption material, to form the heat absorption member of any one of claims 1-9.

11. The production method according to claim 10, wherein The water-containing heat absorption material comprises at least one of a hydrogel heat absorption material and a hydrate; The preparation method of the hydrogel heat absorption material comprises uniformly mixing polyacrylamide, a polyhydric alcohol, water, and a cross-linking agent, and obtaining the hydrogel heat absorption material through a cross-linking reaction.

12. A battery assembly characterized by, The battery assembly comprises a battery and the heat absorption member of any one of claims 1-9, and the heat absorption member is arranged on the surface of the battery.

13. An electrical device, characterized by The battery assembly comprises the battery assembly of claim 12.

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