Battery cell, battery and vehicle

Abstract

The invention relates to a battery monomer, a battery and a vehicle, the battery monomer comprises a shell, a battery cell and an electrode assembly, the battery cell and the electrode assembly are arranged in the shell, the electrode assembly comprises a heat dissipation layer arranged on a tab of the battery cell, the heat dissipation layer can deform along a first direction at high temperature, and the first direction is a direction close to the shell. In the battery monomer provided by the invention, the heat dissipation layer can deform towards the direction close to the shell at high temperature, the distance between the tab and the shell is shortened, the heat of the tab is conducted to the shell and the outside, and the temperature of the tab is reduced, so that the heat dissipation at the position of the tab is realized, the overcurrent capability is improved, and the power performance of the battery is improved.

Description

Technical Field

[0001] This disclosure relates to the field of battery heat dissipation technology, and more particularly to a battery cell, a battery, and a vehicle. Background Technology

[0002] As crucial components connecting the internal and external circuits of a battery, the terminals and tabs require adequate heat dissipation for normal battery operation. In related technologies, heat dissipation in the tab area relies on heat conduction from the terminal terminal area. However, under strong overcurrent conditions, the terminals are subjected to heat transfer from the copper-aluminum busbar and cannot serve as a heat dissipation channel for the tabs. In this situation, the tabs will accumulate heat, affecting the normal operation of the battery. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this disclosure provides a battery cell, a battery, and a vehicle.

[0004] According to a first aspect of the present disclosure, a battery cell is provided, the battery cell including a housing, a cell disposed within the housing, and an electrode assembly, the electrode assembly including a heat dissipation layer disposed on the tabs of the cell, the heat dissipation layer being capable of deforming at high temperature along a first direction, the first direction being the direction close to the housing.

[0005] In the battery cell provided in this disclosure, the heat dissipation layer can deform towards the direction closer to the casing at high temperatures, shortening the distance between the tab and the casing, conducting the heat of the tab to the casing and the outside, reducing the temperature of the tab, thereby achieving heat dissipation at the tab location, improving the overcurrent capacity, and enhancing the power performance of the battery.

[0006] In some possible implementations, the heat dissipation layer can deform to contact the housing.

[0007] When the heat dissipation layer deforms to contact the shell, the distance between the tab and the shell is the shortest, and the tab conducts its own heat to the shell, thus achieving heat dissipation of the tab.

[0008] In some possible implementations, the heat dissipation layer can deform at low temperatures along a second direction, which is a direction away from the housing.

[0009] In high-temperature environments, the heat from the tabs can be conducted to the housing, improving the heat dissipation efficiency of the tabs. In low-temperature environments, it can prevent the heat dissipation layer from contacting the housing, preventing heat leakage from the tab location, improving the insulation effect, and achieving a dynamic balance between heat dissipation and insulation.

[0010] In some possible implementations, during the deformation of the heat dissipation layer along the second direction, a gap X1 is formed between the heat dissipation layer and the inner surface of the housing, wherein 0.2 mm ≤ X1 ≤ 20 mm.

[0011] This gap can act as an insulating air layer, preventing heat from escaping from the electrode tabs. At the same time, within this gap range, it can accommodate the heat dissipation requirements of battery modules of different sizes.

[0012] In some possible implementations, during the deformation of the heat dissipation layer along the first direction, a gap X3 is formed between the heat dissipation layer and the inner surface of the housing, wherein X1 > 3X3.

[0013] It can both ensure the heat dissipation requirements of the tabs at high temperatures and prevent heat loss at low temperatures, thus improving the thermal insulation performance.

[0014] In some possible implementations, the radius of curvature of the heat dissipation layer deformed along the first direction is negatively correlated with the amount of temperature change.

[0015] The greater the temperature change, the smaller the radius of curvature and the greater the bending of the heat dissipation layer's reverse deformation, making it easier to contact the casing and increasing heat dissipation. Conversely, the smaller the temperature change, the larger the radius of curvature and the smaller the bending of the heat dissipation layer's reverse deformation, resulting in slower contact with the casing and a reduction in heat dissipation. The amount of reverse deformation can reduce the thermal resistance between the outer surface of the tab and the inner surface of the casing by more than 10%. By dynamically controlling the amount of reverse deformation, the thermal resistance can be effectively adjusted, effectively suppressing the risk of battery thermal runaway. At the same time, it can avoid excessive cooling under low-temperature conditions, maintain the battery's optimal operating temperature range, and extend the battery's cycle life.

[0016] In some possible implementations, when the temperature of the electrode tab is less than a first temperature threshold T1, the heat dissipation layer deforms along a second direction, wherein T1 ≥ 25°C.

[0017] When the temperature of the electrode tab is less than the first temperature threshold T1, T1≥25℃, for example, when the temperature of the electrode tab drops to below 40℃, the heat dissipation layer 1 can deform along the second direction and form a gap with the inner surface of the shell. This can prevent the heat dissipation layer from contacting the shell, prevent heat from overflowing at the electrode tab position, improve the heat preservation effect, and achieve a dynamic balance between heat dissipation and heat insulation.

[0018] In some possible implementations, the tabs are multiple layers arranged in a stacked manner, and at least some of the multiple layers of tabs are deformable.

[0019] This disclosure includes embodiments in which at least a portion of the multilayer tabs and the heat dissipation layer deform synchronously. The multilayer tabs themselves can be designed to deform in two directions, which can reduce the requirements for the amount of deformation of the heat dissipation layer. When heat dissipation is needed, they can deform faster toward the direction closer to the housing, and when heat loss needs to be prevented at low temperatures, they can move faster away from the housing.

[0020] In some possible implementations, the tabs are provided with fins, and the heat dissipation layer is attached to the surface of the fins facing the housing.

[0021] Designing a separate fin structure to support the heat dissipation layer will not affect the connection between the tabs and the poles. At the same time, the heat from the tabs is conducted to the fins and acts on the heat dissipation layer on the fins, so that the heat dissipation layer can deform in the reverse or forward direction.

[0022] In some possible implementations, the fins are individually fixed to one side of the electrode tab.

[0023] The fins can be additional welded parts to prevent the fins themselves from deforming and tearing the electrical connection parts of the tabs.

[0024] In some possible implementations, the fins are provided on at least one of the two sides in the width direction of the tab.

[0025] It will not affect the battery's dimensions in the height direction, and it can make full use of the space on both sides of the tab without affecting the electrical connection between the tab and the terminal.

[0026] In some possible implementations, the first side of the electrode tab in the width direction is provided with the fin, and the second side opposite to the first side is provided with a notch, which is designed as an irregular electrode tab, which can simplify the structure of the electrode tab.

[0027] In some possible implementations, the dimension of the tab in the height direction is smaller than the width W1 at the location of the fin on the tab, and / or the width W1 at the location of the fin on the tab is greater than the width W0 at other locations.

[0028] In this way, in the width direction of the fins on the tab, no melting will occur in the middle area between the two fins, which will not affect the current of the battery cell being transmitted from the tab to the terminal, and will avoid the formation of a high-resistance area at the heat dissipation layer that would affect the electrical connection function of the tab.

[0029] In some possible implementations, the heat dissipation layer is attached to a first surface of the tab facing the housing, and a support portion is provided on a second surface of the tab facing away from the housing.

[0030] The support section can increase the structural strength at the electrode location, and will not affect the electrical connection at the electrode when the heat dissipation layer deforms.

[0031] In some possible implementations, the heat dissipation layer includes a first deformable layer and a second deformable layer sequentially attached to the surface of the electrode facing the housing, wherein the deformation amount of the first deformable layer is less than the deformation amount of the second deformable layer.

[0032] The first deformation layer and the second deformation layer are stacked together. The first deformation layer can have a linear expansion coefficient of less than 1. The first layer is made of a low-expansion material and serves as the passive layer. The second deformation layer can be made of a material with a linear expansion coefficient greater than [missing information]. Made of a high-expansion material, the active layer is closer to the tabs, while the passive layer is further out. This way, when deforming outwards, the large deformation of the second deformation layer is not restricted, and it can contact the inner wall of the shell more quickly for heat dissipation.

[0033] In some possible implementations, the first deformable layer is made of an iron-nickel Invar alloy; and / or, the second deformable layer is made of a copper alloy or an aluminum alloy, which can be designed as needed.

[0034] According to a second aspect of the present disclosure, a battery is provided, comprising the battery cell described in the above embodiments.

[0035] According to a third aspect of the present disclosure, a vehicle is provided, including a battery provided in the embodiments of the present disclosure.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0038] Figure 1 This is an exploded view of a single battery cell according to relevant exemplary embodiments.

[0039] Figures 2 to 4 This is a schematic diagram of the structure of a battery cell according to a first exemplary embodiment, wherein, Figure 3 and Figure 4 The image shows a front view and a side view of the battery cell in a single battery unit.

[0040] Figures 5 to 7 This is a schematic diagram of the structure of a battery cell according to a second exemplary embodiment, wherein, Figure 6 and Figure 7 The image shows a front view and a side view of the battery cell in a single battery unit.

[0041] Figures 8 to 10 This is a schematic diagram of the structure of a battery cell according to a third exemplary embodiment, wherein, Figure 9 and Figure 10 The image shows a front view and a side view of the battery cell in a single battery unit.

[0042] Figure 11This is a magnified view of the electrode location.

[0043] Figures 12 to 14 This is a schematic diagram illustrating the positional relationship between the tabs and fins according to different exemplary embodiments.

[0044] Figures 15 to 17 This is a schematic diagram of the structure where the heat dissipation layer on the electrode is deformed in different directions.

[0045] Explanation of reference numerals in the attached figures 1-Heat dissipation layer; 11-First deformation layer; 12-Second deformation layer; 20-Cell; 21-Taper; 211-First surface; 212-Second surface; 22-Fin; 23-Notch; 24-Support; 3-Shell; 4-Cover plate; 5-Pole post. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0047] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" generally refer to the definition under normal use conditions of the battery cells provided in this disclosure. For details, please refer to [link / reference needed]. Figure 3 and Figure 4 The drawing orientation is shown. "Inner" and "outer" refer to the inner and outer contours of the corresponding components. The terms "first," "second," etc., are used to distinguish different components and do not indicate sequence or importance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0048] like Figure 1 As shown, the battery cell includes a housing 3, a battery cell 20 disposed within the housing 3, and an electrode assembly. The electrode assembly includes tabs 21, which are metal conductors that lead the positive and negative electrodes out from the battery cell 20. These tabs are located inside the housing 3 and are sealed by a cover plate 4. The terminals 5 on the cover plate 4 are external components used to connect to external circuits. Inside the battery, the tabs 21 and terminals 5 are typically connected by welding via connecting tabs to achieve conductivity between the internal and external circuits.

[0049] To address the heat dissipation problem of the tab 21, this disclosure provides a heat dissipation structure specifically for the tab 21. For example... Figures 2 to 14 As shown, the heat dissipation structure includes a heat dissipation layer 1 disposed on the tab 21 of the battery cell 20, such as... Figure 16 As shown, the heat dissipation layer 1 can deform along a first direction at high temperatures, which is the direction closest to the housing 3. Here, "high temperature" can be 70±10℃, depending on the material of the heat dissipation layer 1, and can be selected and designed as needed. The working principle of the heat dissipation layer 1 is similar to the overheat protection design of rice cookers, electric kettles, etc., and can be a bimetallic temperature switch, composed of two metal plates with different coefficients of thermal expansion. When the temperature rises, the metal plate with the larger coefficient of thermal expansion elongates more, causing the bimetallic strip to bend as a whole. When the bending reaches a certain degree, it cuts off the power supply, achieving overheat protection.

[0050] In the battery cell provided in this disclosure, the heat dissipation layer 1 can deform towards the direction close to the housing 3 at high temperature, shortening the distance between the tab 21 and the housing 3, conducting heat to the housing 3 and the outside, reducing the temperature of the tab 21, thereby achieving heat dissipation at the location of the tab 21, improving the overcurrent capacity, and enhancing the power performance of the battery.

[0051] For example, the heat dissipation layer 1 can be deformed to contact the housing 3. At this time, the distance between the heat dissipation layer 1 and the housing 3 is the shortest, and the tab 21 can conduct its own heat to the housing 3 to achieve heat dissipation of the tab 21.

[0052] In this disclosure, such as Figure 17 As shown, the heat dissipation layer 1 can deform along a second direction at low temperatures, the second direction being the direction away from the shell 3. Here, "low temperature" refers to a situation where the temperature of the tab 21 is less than a first temperature threshold T1 (T1 ≥ 25°C), for example, when the temperature of the tab 21 drops below 40°C. In this case, the heat dissipation layer 1 can deform along the second direction, forming a gap with the inner surface of the shell 3. This prevents the heat dissipation layer 1 from contacting the shell 3, avoids heat leakage at the tab 21 location, improves the insulation effect, and achieves a dynamic balance between heat dissipation and insulation. In this embodiment, the heat dissipation layer 1 can expand outwards at high temperatures and contract inwards at low temperatures; the amount of deformation can be designed as needed.

[0053] In this disclosure, the heat dissipation layer 1 can be configured such that when the temperature of the tab 21 is greater than the second temperature threshold T2, for example when the temperature of the tab 21 reaches 70°C, the heat dissipation layer 1 can deform along the first direction and come into contact with the inner surface of the housing 3, so as to conduct the heat of the tab 21 to the housing 3 and improve the heat dissipation efficiency of the tab 21.

[0054] The radius of curvature of the heat dissipation layer 1 along the first direction is negatively correlated with the temperature change. Here, "radius of curvature" refers to the radius of curvature of the arc-shaped structure formed when the heat dissipation layer 1 deforms outward. When the temperature change is greater, the radius of curvature of the heat dissipation layer 1 along the first direction is smaller, the degree of bending is greater, and it is easier to contact the shell 3, thus increasing the heat dissipation. Conversely, when the temperature change is smaller, the radius of curvature of the heat dissipation layer 1 along the first direction is larger, the degree of bending is smaller, and the contact with the shell 3 is slower, thus appropriately reducing the heat dissipation. The amount of deformation in the reverse direction can reduce the thermal resistance between the outer surface of the tab 21 and the inner surface of the shell 3 by more than 10%. By controlling the amount of deformation along the first direction to dynamically regulate the thermal resistance, the risk of battery thermal runaway can be effectively suppressed. At the same time, excessive cooling under low temperature conditions can be avoided, maintaining the battery's optimal operating temperature range and extending the battery's cycle life.

[0055] like Figure 17 As shown, during the deformation of the heat dissipation layer 1 along the second direction, a gap X1 is formed between the heat dissipation layer 1 and the inner surface of the housing 3. X1 can be between 0.2-20mm. This gap can serve as a heat insulation air layer to prevent the heat from the tab 21 from escaping. At the same time, within this gap range, it can adapt to the heat dissipation requirements of battery modules of different sizes.

[0056] like Figure 15 As shown, when the temperature of the tab 21 is between the first temperature threshold T1 and the second temperature threshold T2, the heat dissipation layer 1 is not deformed, and the distance between the heat dissipation layer 1 and the inner surface of the housing 3 is X2. Figure 16 As shown, during the deformation of the heat dissipation layer 1 along the first direction, a gap X3 is formed between the heat dissipation layer 1 and the inner surface of the shell 3, where X1 > X2 > 3X3. This ensures the heat dissipation requirements of the tab 21 at high temperatures and prevents heat leakage at low temperatures, thus improving thermal insulation performance. The specific material and deformation amount of the heat dissipation layer 1 can be designed according to needs.

[0057] In the above embodiments, heat dissipation and heat preservation of the tab 21 can be achieved solely by the deformation of the heat dissipation layer 1 in two directions. In this disclosure, the tab 21 can be a multi-layered arrangement, and at least some of the multi-layer tabs 21 can deform. That is, this disclosure includes embodiments in which at least some of the multi-layer tabs 21 and the heat dissipation layer 1 deform synchronously. The multi-layer tabs 21 themselves can be designed to deform in two directions, which can reduce the requirement for the deformation amount of the heat dissipation layer 1. When heat dissipation is needed, they can deform faster toward the direction closer to the shell 3, and when heat loss needs to be prevented at low temperatures, they can move faster away from the shell 3.

[0058] exist Figures 8 to 10In the illustrated embodiment, the heat dissipation layer 1 can be directly disposed on the tab 21. The heat dissipation layer 1 is attached to the first surface 211 of the tab 21 facing the housing 3, and the second surface 212 of the tab 21 facing away from the housing 3 is provided with a support portion 24. The support portion 24 can increase the structural strength at the location of the tab 21, and will not affect the electrical connection at the tab 21 when the heat dissipation layer 1 deforms.

[0059] exist Figures 2 to 7 In the embodiment shown, the tab 21 is provided with fins 22, and the heat dissipation layer 1 is attached to the surface of the fins 22 facing the housing 3. Designing a separate fin structure to support the heat dissipation layer 1 will not affect the connection between the tab 21 and the pole post 5. At the same time, the heat from the tab 21 is conducted to the fins 22 and acts on the heat dissipation layer 1 on the fins 22, thereby causing the heat dissipation layer 1 to deform in the reverse or forward direction.

[0060] In this embodiment, the fin 22 can be separately fixed to one side of the tab 21. For example, the fin 22 can be an additional welded part to prevent the fin 22 itself from deforming and tearing the electrical connection part of the tab 21. Of course, this disclosure also includes embodiments in which the fin 22 and the tab 21 are an integral structure.

[0061] like Figure 3 As shown, a fin 22 may be provided on one side of the tab 21 in the width direction, such as Figure 6 and Figure 12 As shown, fins 22 are provided on both sides of the tab 21 in the width direction, as... Figure 13 and Figure 14 As shown, a fin 22 can be provided on the first side of the tab 21 in the width direction, and a notch 23 can be provided on the second side opposite to the first side, which is designed as an irregularly shaped tab, which can simplify the structure of the tab 21. All of these are within the protection scope of this disclosure. It will not affect the size of the battery in the height direction, and can make full use of the space on both sides of the tab 21, without affecting the electrical connection between the tab 21 and the terminal post 5.

[0062] like Figure 12 As shown, the dimension of the tab 21 in the height direction is smaller than the width W1 at the location of the upper fin 22 of the tab 21, and / or, as Figures 12 to 14 As shown, the width W1 at the location of the fin 22 on the tab 21 is greater than the width W0 at other locations. In this way, in the width direction of the fin 22 on the tab 21, a melt will not form in the middle area between the two fins 22, which will not affect the current of the cell 20 being transmitted from the tab 21 to the electrode post 5, and will avoid the formation of a high-resistance area at the location of the heat dissipation layer 1, which would affect the electrical connection function of the tab 21.

[0063] like Figure 11As shown, the heat dissipation layer 1 includes a first deformable layer 11 and a second deformable layer 12 sequentially attached to the surface of the tab 21 facing the housing 3, wherein the deformation amount of the first deformable layer 11 is less than the deformation amount of the second deformable layer 12. The first deformable layer 11 and the second deformable layer 12 are stacked together, and the first deformable layer 11 can be made of material with a linear expansion coefficient less than 1 / 2. The second deformation layer 12 is made of a low-expansion material and serves as the passive layer. The coefficient of linear expansion of the second deformation layer 12 can be greater than [a certain value]. The second deformation layer 12 is made of a high-expansion material and is the active layer. The passive layer is closer to the tab 21 and the active layer is further out. In this way, when deforming outward, the large deformation amount of the second deformation layer 12 is not restricted, and it can contact the inner wall of the shell 3 more quickly for heat dissipation.

[0064] In the embodiments provided in this disclosure, the first deformable layer 11 may be made of an iron-nickel Invar alloy; and / or, the second deformable layer 12 may be made of a copper alloy or an aluminum alloy or a combination of both, which may be designed as needed.

[0065] According to a second aspect of this disclosure, a battery is provided, comprising the battery cells described above. The battery can be a battery pack or a battery module, and may include at least one of the battery cells described above. The battery can also be a secondary battery, capable of dissipating heat from the tab 21 under conditions of high overcurrent demand. This battery can be applied to high-rate usage scenarios such as vehicles operating under extreme racing conditions or power tools.

[0066] According to a third aspect of this disclosure, a vehicle is provided, including the battery provided herein. The battery and the vehicle possess all the beneficial effects of the aforementioned battery cell, which will not be elaborated upon here.

[0067] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0068] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0069] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0070] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0071] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0072] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0073] It should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "installing," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure 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, an electrical connection, or a connection that allows communication between them; 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 herein based on the specific circumstances.

[0074] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0075] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. 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 indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

Claims

1. A battery cell, characterized in that, The device includes a housing, a battery cell disposed within the housing, and an electrode assembly. The electrode assembly includes a heat dissipation layer disposed on the tabs of the battery cell. The heat dissipation layer is capable of deforming at high temperatures along a first direction, which is the direction closer to the housing.

2. The battery cell according to claim 1, characterized in that, The heat dissipation layer can deform to contact the housing.

3. The battery cell according to claim 1, characterized in that, The heat dissipation layer can deform at low temperatures along a second direction, which is the direction away from the housing.

4. The battery cell according to claim 3, characterized in that, During the deformation of the heat dissipation layer along the second direction, a gap X1 is formed between the heat dissipation layer and the inner surface of the housing, wherein 0.2mm≤X1≤20mm.

5. The battery cell according to claim 4, characterized in that, During the deformation of the heat dissipation layer along the first direction, a gap X3 is formed between the heat dissipation layer and the inner surface of the housing, wherein X1 > 3X3.

6. The battery cell according to claim 1, characterized in that, The radius of curvature of the heat dissipation layer deformed along the first direction is negatively correlated with the amount of temperature change.

7. The battery cell according to claim 3, characterized in that, When the temperature of the electrode is less than the first temperature threshold T1, the heat dissipation layer deforms along the second direction, wherein T1 ≥ 25℃.

8. The battery cell according to claim 1, characterized in that, The electrode tabs are arranged in multiple layers, and at least some of the multiple electrode tabs can be deformed.

9. The battery cell according to any one of claims 1-8, characterized in that, The tab is provided with fins, and the heat dissipation layer is attached to the surface of the fins facing the housing.

10. The battery cell according to claim 9, characterized in that, The fins are individually fixed to one side of the electrode tab.

11. The battery cell according to claim 9, characterized in that, The fins are provided on at least one of the two sides in the width direction of the electrode tab.

12. The battery cell according to claim 9, characterized in that, The first side of the electrode ear in the width direction is provided with the fin, and the second side opposite to the first side is provided with a notch.

13. The battery cell according to claim 9, characterized in that, The dimension of the electrode tab in the height direction is smaller than the width W1 at the location of the fin on the electrode tab; and / or, the width W1 at the location of the fin on the electrode tab is greater than the width W0 at other locations.

14. The battery cell according to claim 1, characterized in that, The heat dissipation layer is attached to the first surface of the electrode facing the housing, and the second surface of the electrode away from the housing is provided with a support portion.

15. The battery cell according to claim 1, characterized in that, The heat dissipation layer includes a first deformation layer and a second deformation layer sequentially attached to the tab and facing the surface of the housing, wherein the deformation amount of the first deformation layer is less than the deformation amount of the second deformation layer.

16. The battery cell according to claim 15, characterized in that, The first deformable layer is made of an iron-nickel Invar alloy; and / or the second deformable layer is made of a copper alloy or an aluminum alloy.

17. A battery, characterized in that, Includes the battery cell according to any one of claims 1-16.

18. A vehicle, characterized in that, Includes the battery as described in claim 17.

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