A battery cell, a battery cell shell, a lithium battery, an electric device and a vehicle

Abstract

A battery cell casing, a battery cell, a lithium battery, electrical equipment, and a vehicle are disclosed. The battery cell casing includes: a heat-absorbing element for absorbing heat from the battery cell body; and a housing with a receiving cavity for accommodating the heat-absorbing element and the battery cell body. The heat-absorbing element in this invention can rapidly absorb heat and reduce the temperature of the battery cell when thermal runaway occurs, thereby preventing thermal runaway. This eliminates the need for additional active fire suppression systems to prevent thermal runaway within the lithium battery module or housing, significantly improving space utilization while reducing cost and weight.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery cell casing, a battery cell, a lithium battery, electrical equipment, and a vehicle. Background Technology

[0002] This invention relates to the field of battery technology, and in particular to a battery cell casing, a battery cell, a lithium battery, electrical equipment, and a vehicle. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] The present invention aims to at least partially solve one of the aforementioned technical problems. To achieve the above objective, the present invention provides a battery cell casing, a battery cell, a lithium battery, an electrical device, and a vehicle.

[0005] Firstly, this application proposes a battery cell casing to address the problem of high-temperature fires and explosions caused by thermal runaway of the battery cell. The battery cell casing includes: a heat-absorbing element for absorbing heat from the battery cell body; and a housing with a receiving cavity for accommodating the heat-absorbing element and the battery cell body. The heat-absorbing element can rapidly absorb heat and reduce the cell temperature when thermal runaway occurs in a pouch battery cell, thereby preventing thermal runaway. Lithium batteries no longer require additional heat dissipation devices to prevent thermal runaway and extinguish fires, greatly improving space utilization while reducing cost and weight.

[0006] In some alternative embodiments, the outer casing is an aluminum-plastic film or a high-temperature resistant thermoplastic material.

[0007] In some alternative embodiments, the housing includes at least two encapsulation portions, at least one of the encapsulation portions encapsulating the heat-absorbing element, and at least another encapsulation portion encapsulating the battery cell body, with the at least two encapsulation portions disposed opposite to each other.

[0008] In some alternative embodiments, at least two of the encapsulation portions are arranged opposite each other after being folded.

[0009] In some alternative embodiments, the number of receiving cavities provided on each of the encapsulation portions of the housing is at least one.

[0010] In some alternative embodiments, the heat absorber is a phase change material.

[0011] In some alternative embodiments, the heat-absorbing element is a hydrogel.

[0012] In some alternative embodiments, the cell housing further includes a sealing film connected to the housing for sealing the receiving cavity.

[0013] In some alternative embodiments, the sealing film includes at least two sealing films, which are disposed corresponding to the at least two encapsulation portions, and the at least two sealing films are used to seal the at least two encapsulation portions.

[0014] Secondly, this application proposes a battery cell, including the battery cell casing and the battery cell body.

[0015] In some alternative embodiments, the cell body includes electrodes, wherein the electrodes include positive electrodes and negative electrodes.

[0016] In some alternative implementations, the cell body includes a wound core.

[0017] In some alternative embodiments, the core includes a diaphragm disposed between adjacent positive and negative electrode plates.

[0018] In some alternative embodiments, the diaphragm comprises at least one layer of polyethylene film.

[0019] In some alternative embodiments, the battery cell further includes tabs, which include a positive tab and a negative tab; the positive tab is connected to the positive electrode plate, and the negative tab is connected to the negative electrode plate.

[0020] In some alternative implementations, the battery cell also includes an electrolyte.

[0021] Thirdly, this application proposes a lithium battery, including the aforementioned cell casing or the aforementioned cell, wherein a plurality of the aforementioned cells are arranged sequentially.

[0022] Fourthly, this application proposes an electrical device, including the aforementioned battery cell casing, the aforementioned battery cell, or the aforementioned lithium battery, wherein the battery cell or the aforementioned lithium battery is used to provide electrical energy to the electrical device.

[0023] Fifthly, this application proposes a vehicle including the battery cell or the lithium battery.

[0024] This invention innovatively incorporates heat-absorbing material within the housing cavity of the battery cell casing. The casing not only protects the battery cell but also, when the cell temperature becomes too high, absorbs heat from the housing cavity to prevent overheating and potential fires or explosions. This significantly extends the lifespan of both the battery cell and the lithium battery. Furthermore, the battery cell eliminates the need for additional cooling devices, and the lithium battery module or casing no longer requires additional active fire suppression systems to prevent thermal runaway. This greatly improves battery space utilization while reducing cost and weight. For electrical equipment or vehicles equipped with batteries featuring this self-heating function, safety is significantly enhanced during use.

[0025] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0027] Figure 1 This application provides a schematic diagram of a battery cell casing; Figure 2 This application provides a schematic diagram of a battery cell casing after encapsulation. Figure 3 This application provides a schematic diagram of the structure of a battery cell casing before sealing; Figure 4 Another schematic diagram of the battery cell casing after encapsulation provided in this application embodiment; Figure 5 Another schematic diagram of the battery cell casing before sealing is provided in this application embodiment; Figure 6 This application provides a schematic diagram of a battery cell; Figure 7 A schematic diagram of a diaphragm is provided in an embodiment of this application; Figure 8 Another schematic diagram of a diaphragm provided in this application embodiment.

[0028] Explanation of reference numerals in the attached figures: 1-Heat-absorbing element, 2-Cell body, 21-Electrode, 211-Positive electrode, 212-Negative electrode, 22-Core, 221-Separator 222-PE polyethylene film, 223-PP polypropylene, 3-outer shell, 31-receiving cavity, 32-encapsulation part, 33-fold line, 4-Sealing membrane, 5-Taper, 51-Positive tab, 52-Negative tab, 6-Electrolyte Detailed Implementation

[0029] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with embodiments of the invention.

[0030] The embodiments of the present invention will now be described with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0032] This invention provides a battery cell casing, comprising: a heat-absorbing element 1 for absorbing heat from the battery cell body 2; and a casing 3 having a receiving cavity 31, which houses the heat-absorbing element 1 and also houses the battery cell body 2. Thus, the receiving cavity 31 houses the heat-absorbing element 1 and the battery cell body 2, while the casing 3 serves to support and house the heat-absorbing element 1, and simultaneously protects the battery cell body 2. The heat-absorbing element 1 absorbs heat, preventing it from bursting or causing gas to leak from the receiving cavity 31. By vaporizing and absorbing heat from the battery cell body 2, the heat-absorbing element 1 helps cool the battery cell and thus extends the battery's lifespan.

[0033] In some embodiments, the outer casing 3 is an aluminum-plastic film or a high-temperature resistant thermoplastic material. The soft-pack battery cell casing uses aluminum-plastic film as the packaging material and employs heat sealing, typically consisting of three layers: a nylon layer, an Al layer, and a PP layer. Using aluminum-plastic film packaging ensures that in the event of a safety issue, the soft-pack battery will bulge and crack rather than explode, making it safer than steel-cased or aluminum-cased cells. Secondly, soft-pack batteries are lightweight; compared to steel-cased lithium batteries of the same capacity, they are at least 40% lighter, and compared to aluminum-cased lithium batteries, they are at least 20% lighter. Using aluminum-plastic film or high-temperature resistant thermoplastic materials helps reduce the overall weight of the battery pack.

[0034] In some embodiments, such as Figure 1 As shown, the outer casing 3 includes at least two encapsulation portions 32. At least one encapsulation portion 32 encapsulates the heat-absorbing element 1, and at least another encapsulation portion 32 is used to encapsulate the battery cell body 2. The at least two encapsulation portions 32 are arranged opposite to each other. At least two encapsulation portions 32 are provided on the outer casing 3, with one encapsulation portion 32 corresponding to the heat-absorbing element 1 and the other encapsulation portion 32 corresponding to the battery cell body 2. The two encapsulation portions are arranged opposite to each other, that is, the heat-absorbing element 1 and the battery cell body 2 are arranged opposite to each other.

[0035] In some embodiments, such as Figure 1-2 As shown, after the outer casing 3 of the battery cell is folded, at least two encapsulation parts 32 are arranged opposite each other. The outer casing 3 is folded along the fold line 33, and at least two encapsulation parts 32 are overlapped and arranged opposite each other. Then, these two encapsulation parts 32 are connected together to form a sealed cavity composed of the heat-absorbing element 1 and the battery cell body 2. When the battery cell body 2 overheats, the heat-absorbing element 1 can effectively conduct away the heat generated by the battery cell body 2, reduce the temperature of the battery cell body 2, thereby reducing the temperature rise of the battery cell body 2 and protecting the battery cell body 2 from overheating damage. The heat-absorbing element 1 and the outer casing 3 can form a protective layer on the surface of the battery cell body 2, isolating the battery cell body 2 from the influence of the external environment, reducing the intrusion of dust and moisture, and preventing the battery cell from being damaged by changes in the external environment.

[0036] In some embodiments, such as Figure 3-5 As shown, each encapsulation portion 32 of the outer casing 3 has at least one receiving cavity 31. The soft-pack battery cell can be customized to different sizes according to the design. Once the size is determined, a corresponding mold needs to be made so that the outer casing 3 can be formed into the required shape. This process is called punching, and this punching is the receiving cavity 31. When the battery cell is thin, a single punching, i.e., a single receiving cavity, is generally chosen. When the battery cell is thicker, double or multiple punchings are chosen. It is important to note that the deformation of the outer casing 3 must be controlled within a reasonable range to prevent it from exceeding the deformation limit and causing cracking. The outer casing 3 is punched with holes that can accommodate the heat absorber 1 and the battery cell body 2. The heat absorber 1 and the battery cell body 2 are then placed into the pre-punched receiving cavity 31 of the outer casing 3. Optionally, the outer casing 3 is provided with two receiving cavities 31, one receiving cavity 31 for accommodating the heat-absorbing component 1 and the other for accommodating the battery cell body 2; alternatively, the outer casing 3 is provided with multiple receiving cavities 31, each of which respectively accommodates the heat-absorbing component 1 and the battery cell body 2, and the multiple battery cell bodies 2 can be connected in series. This design can save materials, reduce battery size, and improve battery volume utilization.

[0037] In some embodiments, the heat absorber 1 is a phase change material (PCM), which is based on the process of absorbing or releasing a large amount of latent heat when a substance transitions between a solid and a liquid state. When the ambient temperature rises to the melting point of the PCM, the material changes from a solid to a liquid state, absorbing heat from its surroundings. Common phase changes include melting from solid to liquid, vaporization from liquid to gas, sublimation from solid to gas, and solidification from liquid to solid. During the phase change process, the material absorbs or releases a large amount of latent heat. This characteristic allows PCM to store and release energy while maintaining a constant temperature. PCM stores energy through latent heat, rather than by changing its own temperature, enabling it to store more heat in a smaller space. The PCM that can be used for the heat absorber 1 is a hydrogel, aerogel, tunable PCM, or solid-liquid PCM.

[0038] In some embodiments, the heat absorber 1 is a hydrogel. Preferably, the phase change material of the heat absorber 1 is a hydrogel, which is a three-dimensional network formed by the cross-linking of hydrophilic polymer chains. It can fully absorb water but is insoluble in water. The hydrogel's heat dissipation and condensation molecules contain a large number of hydrophilic groups, which form hydrogen bonds with water molecules through the amino groups of glucosamine, thereby absorbing water molecules. When the cell temperature rises abnormally, reaching above 800°C, the hydrogel structure is destroyed, generating a large amount of water vapor to extinguish open flames. The rapid evaporation of water cools and controls the temperature. Even if cell combustion occurs, the good thermal insulation and flame retardant properties of water can block the transmission of thermal runaway. Hydrogel has strong thermal runaway control capabilities and can delay thermal runaway time. Its application in cell can maximize the prevention of thermal runaway. The hydrogel electrolyte can maintain mechanical stability over a wider temperature range and is suitable for environments from at least -20°C to 60°C. It has good flexibility and a wide temperature range. The electrolyte of the hydrogel battery has high flexibility, which allows the battery to remain stable under different bending conditions, exhibiting high flexibility.

[0039] In some embodiments, the battery cell housing further includes a sealing film 4, which is connected to the housing 3 and used to seal the receiving cavity 31. The sealing film 4 is connected to the housing 3 and is used to seal the opening of the receiving cavity 31, specifically to seal the heat-absorbing element 1 and the battery cell body 2. The sealed heat-absorbing element 1 and the sealed battery cell body 2 are fixedly connected relative to each other. Figure 3 , Figure 5 As shown, the sealing film 4 covers the receiving cavity 31 of the outer shell 3. The sealing film 4 can seal one receiving cavity 31 or seal at least two or more receiving cavities 31.

[0040] In some embodiments, the sealing film 4 includes at least two sealing films, which are correspondingly disposed with at least two encapsulation portions 32, and are used to seal at least two encapsulation portions 32. When the sealing film 4 is in a sealed state, the heat-absorbing element 1 is located inside the sealing film 4, and the inside of the sealing film 4 is not in communication with the outside of the sealing film 4. When the pressure inside the sealing film 4 reaches a predetermined threshold, the sealing film 4 breaks open to allow communication between the inside and outside of the sealing film. Furthermore, the heat-absorbing element 1 inside the sealing film can absorb the heat released by the battery cell body 2, thereby achieving the effect of heat absorption and cooling of the battery cell.

[0041] like Figure 6As shown, the present invention also provides a battery cell, including the aforementioned battery cell casing and battery cell body 2. The battery cell casing, as the packaging material for the battery cell body, is mainly used to protect the internal battery cell structure from damage by the external environment. The aforementioned battery cell casing with heat-absorbing components helps to quickly dissipate the heat generated by the battery during operation, ensuring the safe operation of the battery. Furthermore, the aforementioned battery casing uses an aluminum-plastic film, which has the advantages of good flexibility, high design flexibility, variable shape, and thinner profile.

[0042] In some embodiments, the cell body 2 includes electrode plates 21, which include a positive electrode plate 211 and a negative electrode plate 212. The positive and negative electrode plates are the basic units constituting the cell. The positive electrode is typically made of aluminum foil (Al), and the negative electrode is generally made of copper foil (Cu). These materials have good conductivity and can accommodate the insertion and extraction of lithium ions during charging and discharging. The positive electrode plate is typically coated on aluminum foil to form a uniform layer of active material. The negative electrode plate adopts a similar structure, but typically uses copper foil as the substrate. This structure not only improves the conductivity of the electrode but also helps maintain the stability of the electrode during charging and discharging. During charging, lithium ions and electrons in the positive electrode active material are separated. Lithium ions migrate through the electrolyte to the negative electrode, where they combine with electrons to form neutral lithium atoms, which are stored in the negative electrode. During discharging, lithium ions are released from the negative electrode and migrate back to the positive electrode, releasing the stored energy to power the battery. This exchange process of lithium ions and electrons migrating between the positive and negative electrode plates realizes the battery's energy storage and release function. In summary, the positive and negative electrodes are the core components of a battery cell. Their material composition, structural characteristics, and mechanisms of action in battery operation jointly determine the battery's performance.

[0043] In some embodiments, the cell body 2 includes a wound core 22. Electrode sheets 4 are stacked and glued according to a specific stacking method, such as Z-shaped or wound, to form a wound core 22, which is then placed into a pre-punched receiving cavity 31. The wound core is an important component of the cell and is one of the key factors affecting cell performance and lifespan. The composition materials, energy storage capacity, and conductivity of the wound core directly affect the battery's capacity, voltage, cycle life, and safety. Currently, lithium battery wound cores are widely used in power banks, electric vehicles, drones, and other fields. They offer advantages such as smaller size, larger capacity, shorter charging time, and higher energy density. Lithium battery wound cores do not generate gas during charging and discharging and have an electronic control protection system to prevent safety issues such as overcharging, over-discharging, and short circuits.

[0044] In some embodiments, the core 22 includes a separator 221 disposed between adjacent positive electrode plates 211 and negative electrode plates 212. The separator is used to separate the electrode plates, and its main function is to separate the positive and negative electrodes of the battery to prevent short circuits caused by contact between the two electrodes. Heat sealing mainly relies on the PP separator melting and bonding together under the heating of the end cap, followed by solidification upon cooling. The battery casing has a cavity for storing the hydrogel, whose main component is sodium polyacrylate, and the electrode plates. Hydrogel heat sealing mainly relies on the PP separator melting and bonding together under the heating of the end cap, followed by solidification upon cooling. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent short circuits caused by contact between the two electrodes. The separator material is non-conductive; different types of batteries use different separators, generally PE polyethylene film.

[0045] The core 22 is composed of a series of alternating stacked positive electrode sheets 211, negative electrode sheets 212, and separators 221. The positive electrode sheets 211 and negative electrode sheets 212 are separated by the separator 221 to prevent direct contact and short circuits. The positive electrode sheets 211 and 212 respectively contain positive and negative active materials and conductive materials. The separator 221 isolates the positive and negative electrode sheets 211 and 212 to prevent short circuits. The function of the lithium battery core is to convert the chemical reaction between the positive and negative electrodes into electrical energy and store that energy. Through the charging and discharging process, lithium ions move back and forth between the positive and negative electrodes, repeatedly inserting and detaching from the active materials, thus completing the charging and discharging process of the battery.

[0046] like Figure 7-8 As shown, in some embodiments, the separator 221 includes at least one layer of PE polyethylene film 222. The separator 221 can be configured as a single layer of PE polyethylene film 222, or a multilayer film composed of a single layer of PE polyethylene film 222 and a PP polypropylene film 223; the middle layer of the multilayer film is a PE polyethylene film, and the outer layer is a PP polypropylene film. This invention, by incorporating hydrogel into the battery cell casing, allows condensation to occur when the temperature exceeds 130°C, and water vapor to form upon further heating. The rapid evaporation of water at high temperatures absorbs heat, quickly reducing the battery cell temperature and preventing further deterioration due to temperature increases, thereby preventing membrane rupture and ensuring high safety. By incorporating hydrogel, only the PE polyethylene film layer can be retained. Due to its excellent low-temperature resistance, high porosity, and melting point below 130°C, it can block current at high temperatures through a closed-cell mechanism, improving safety. The single layer of PE polyethylene film reduces the separator thickness, correspondingly achieving higher power, higher capacity, and longer cycle life.

[0047] In some embodiments, a battery cell further includes tabs 5, which include a positive tab 51 and a negative tab 52; the positive tab 51 is connected to a positive electrode plate 211, and the negative tab 52 is connected to a negative electrode plate 212. A tab is a metallic conductor that serves to draw the positive and negative electrodes from the battery cell. In other words, the tab is the contact point between the positive and negative terminals of the battery during charging and discharging, ensuring normal battery operation. Tabs are widely used in many fields such as mobile phone batteries, Bluetooth batteries, and laptop batteries. In a battery, the tab acts as a conductor during charging and discharging, connecting the positive and negative terminals. The tab performs conductive and sealing functions and also connects the inside and outside of the battery. Simultaneously, the tab is responsible for drawing electrical energy from inside the battery to form a circuit, realizing the charging and discharging function of the battery. Furthermore, the sealing performance of the tab ensures the safety and stability of the battery during use.

[0048] In some embodiments, a battery cell further includes an electrolyte 6. The main function of the electrolyte 6 is to conduct lithium ions between the positive electrode 211 and the negative electrode 212 of the battery cell, thereby enabling the battery to undergo an effective charging and discharging process.

[0049] The present invention also provides a lithium battery, including the above-mentioned cell casing or the above-mentioned cell, wherein a plurality of cells are arranged in sequence.

[0050] Secondly, this application proposes a lithium battery comprising a cell casing and a cell with a heat sink 1, as mentioned above. When the cell experiences thermal runaway, it releases a large amount of energy in a short time. The heat sink undergoes a phase change, rapidly absorbing heat and cooling the runaway cell, reducing its temperature. This facilitates heat dissipation of the battery pack and prevents the battery from catching fire or exploding. Due to its unique packaging design, the soft-pack lithium battery offers excellent safety performance and is less prone to explosion compared to hard-shell packaging. Simultaneously, it has a higher energy density and is lighter for the same capacity, at least 40% lighter than steel-cased lithium batteries and 20% lighter than aluminum-cased lithium batteries.

[0051] Thirdly, the present invention also provides an electrical device, including the aforementioned battery cell or lithium battery, wherein the battery cell or lithium battery is used to provide electrical energy to the electrical device. The electrical device configured with the aforementioned battery cell or lithium battery can be a vehicle, aircraft, ship, computer, or energy storage device, but is not limited thereto. Other configurations and operations of the battery cell, battery, and electrical device according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0052] Fourthly, the present invention also provides a vehicle comprising the above-mentioned battery cells or the above-mentioned lithium batteries.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings only show the parts relevant to the present invention, not the entire structure.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery cell casing, characterized in that, include: Heat-absorbing element (1), the heat-absorbing element (1) is used to absorb heat from the battery cell body (2); The outer casing (3) is provided with a receiving cavity (31) for accommodating the heat-absorbing element (1) and for accommodating the battery cell body (2).

2. The battery cell casing as described in claim 1, characterized in that, The outer shell (3) is made of aluminum-plastic film or high-temperature resistant thermoplastic material.

3. The battery cell casing as described in claim 2, characterized in that, The outer casing (3) includes at least two encapsulation parts (32), at least one of the encapsulation parts (32) encapsulates the heat-absorbing element (1), and at least another encapsulation part (32) is used to encapsulate the battery cell body (2), and the at least two encapsulation parts (32) are arranged opposite to each other.

4. The battery cell casing as described in claim 3, characterized in that, After being folded, at least two of the encapsulation portions (32) are arranged opposite each other.

5. The cell casing as described in any one of claims 3-4, characterized in that, The number of receiving cavities (31) provided on each of the encapsulation portions (32) of the housing is at least one.

6. The battery cell casing as described in any one of claims 1-3, characterized in that, The heat-absorbing element (1) is a phase change material.

7. The battery cell casing as described in claim 6, characterized in that, The heat-absorbing element (1) is a hydrogel.

8. The battery cell casing as described in claim 1, characterized in that, It also includes a sealing membrane (4), which is connected to the outer shell (3) to seal the receiving cavity (31).

9. The battery cell casing as described in claim 8, characterized in that, The sealing film (4) includes at least two sealing films (4), which are disposed corresponding to the at least two encapsulation parts (32) and are used to seal the at least two encapsulation parts (32).

10. A battery cell comprising a battery cell casing and a battery cell body (2) as described in any one of claims 1-9.

11. A battery cell as described in claim 10, characterized in that, The cell body (2) includes an electrode (21), wherein the electrode (21) includes a positive electrode (211) and a negative electrode (212).

12. A battery cell as described in claim 10, characterized in that, The battery cell body (2) includes a core (22).

13. A battery cell as described in claim 12, characterized in that, The core (22) includes a diaphragm (221) disposed between adjacent positive electrode plates (211) and negative electrode plates (212).

14. A battery cell as described in claim 13, characterized in that, The diaphragm (221) comprises at least one layer of PE polyethylene film (222).

15. A battery cell as described in any one of claims 10-13, characterized in that, It also includes tabs (5), which include a positive tab (51) and a negative tab (52); the positive tab (51) is connected to the positive electrode plate (211), and the negative tab (52) is connected to the negative electrode plate (212).

16. A battery cell as described in claim 10, characterized in that, It also includes electrolyte (6).

17. A lithium battery, characterized in that, It includes the cell casing as described in any one of claims 1-9, or the cell as described in any one of claims 10-16, wherein a plurality of the cells are arranged sequentially.

18. An electrical appliance, characterized in that, The device includes a cell casing as described in any one of claims 1-9, a cell as described in any one of claims 10-16, or a lithium battery as described in claim 17, wherein the cell or the lithium battery is used to provide electrical energy to the electrical device.

19. A vehicle, characterized in that, Includes the battery cell as described in any one of claims 10-16 or the lithium battery as described in claim 17.

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