Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, and relates to the field of batteries, the battery monomer comprises: a shell having an accommodating cavity inside; the electrode assembly is positioned in the accommodating cavity, and the electrode assembly is provided with a tab; the heat conduction piece is located between the inner wall of the containing cavity and the electrode assembly and makes contact with the electrode assembly; in the direction from the position close to the tab to the position far away from the tab, the contact area of the heat conduction part and the electrode assembly is gradually reduced, and the temperature difference of all parts of the battery monomer can be reduced. The invention also provides a battery device using the battery monomer, and a power utilization device using the battery device.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery cell, a battery, and an electrical device. Background Technology

[0002] During the charging and discharging process of a battery cell, different parts of the battery cell generate different amounts of heat, which may create temperature differences in different areas of the battery cell. These temperature differences may lead to the failure of the battery cell. For example, the high-temperature area of ​​the battery cell may cause the battery cell to be damaged due to overheating, while the low-temperature area of ​​the battery cell may cause lithium plating due to excessively low temperature. It is necessary to reduce the temperature difference between different parts of the battery cell. Summary of the Invention

[0003] This application provides a battery cell, a battery, and an electrical device to solve the technical problem of how to reduce the temperature difference between different parts of a battery cell.

[0004] The first aspect of this application provides a battery cell, which includes a housing having an internal cavity, an electrode assembly having tabs located within the cavity, and a heat-conducting element located between the inner wall of the cavity and the electrode assembly and in contact with the electrode assembly, wherein the contact area between the heat-conducting element and the electrode assembly decreases in the direction from near the tabs to away from the tabs.

[0005] By decreasing the contact area between the heat-conducting component and the electrode assembly from the direction closer to the tab to the direction farther from the tab, the heat of the part of the electrode assembly closer to the tab can be conducted more quickly to the part farther from the tab, and the heat loss of the part of the electrode assembly farther from the tab is reduced. Thus, while reducing the temperature difference between different parts of the electrode assembly, it is not necessary to increase the size of the heat-conducting component or replace the material of the heat-conducting component with a more expensive material with higher thermal conductivity.

[0006] In some embodiments, there are multiple electrode assemblies, each of which is located within a receiving cavity; wherein, the heat-conducting element includes a first part and a second part that can conduct heat to each other, the first part is located between the inner wall of the receiving cavity and the electrode assembly, the second part is located between adjacent electrode assemblies, and the contact area between the first part and the electrode assembly is greater than the contact area between the second part and the electrode assembly.

[0007] By making the contact area between the first part and the electrode assembly larger than the contact area between the second part and the electrode assembly, the heat of the part of the electrode assembly facing the inner wall of the cavity can be quickly conducted to the part between adjacent electrode assemblies, and the heat loss between the parts of the electrode assemblies is reduced. Thus, while reducing the temperature difference between the parts of the electrode assembly, it is not necessary to increase the size of the heat-conducting component or replace the material of the heat-conducting component with a more expensive material with higher thermal conductivity.

[0008] In some embodiments, the surface of the heat conductor facing the electrode assembly has a plurality of first grooves, the distribution density of which increases along the direction from near the electrode tab to away from the electrode tab.

[0009] By increasing the distribution density of the first groove in the direction from near the tab to away from the tab, the contact area between the heat-conducting element and the electrode assembly can be reduced, thereby reducing the heat conduction capacity of the heat-conducting element to the electrode assembly. This reduces the temperature difference between the part of the electrode assembly near the tab and the part away from the tab. Furthermore, since the groove does not need to penetrate the heat-conducting element, the heat conduction capacity of each part of the heat-conducting element can meet the requirements while ensuring sufficient structural strength and a longer service life.

[0010] In some embodiments, the non-depth dimension of the first groove increases, and the non-depth dimension is a dimension perpendicular to the depth direction of the first groove.

[0011] By increasing the non-thickness dimension of the first groove in the direction from near the tab to away from the tab, the contact area between the heat-conducting element and the electrode assembly can be reduced, thereby reducing the heat conduction capacity of the heat-conducting element to the electrode assembly, and thus reducing the temperature difference between the part of the electrode assembly near the tab and the part away from the tab.

[0012] In some embodiments, the surface of the first portion facing the electrode assembly has a second groove, and the surface of the second portion facing the electrode assembly has a third groove, wherein the distribution density of the second groove is greater than the distribution density of the third groove.

[0013] By making the array density of the second groove greater than that of the third groove, the thermal conductivity of the first part is greater than that of the second part, thereby reducing the temperature difference between the third and fourth parts of the electrode assembly. Moreover, since the grooves do not need to penetrate the heat conductor, the thermal conductivity of each part of the heat conductor can meet the requirements while giving the heat conductor sufficient structural strength and a longer service life.

[0014] In some embodiments, the non-depth dimension of the second groove is smaller than the non-depth dimension of the third groove, wherein the non-depth dimension of the second groove is a dimension perpendicular to the depth direction of the second groove, and the non-depth dimension of the third groove is a dimension perpendicular to the depth direction of the third groove.

[0015] By making the non-depth dimension of the second groove smaller than the non-depth dimension of the third groove, the contact area between the first part and the electrode assembly can be made larger than the contact area between the second part and the electrode assembly, thereby making the thermal conductivity of the first part greater than that of the second part, thus reducing the temperature difference between the third and fourth parts of the electrode assembly.

[0016] In some embodiments, the heat-conducting element has a plurality of first through holes, the distribution density of which increases in the direction from near the tab to away from the tab.

[0017] By increasing the distribution density of the first through holes in the direction from near the tab to away from the tab, the heat conduction capacity of the heat conductor to the electrode assembly decreases, thereby reducing the temperature difference between the part of the electrode assembly near the tab and the part away from the tab. Moreover, by setting the through hole structure to reduce the contact area between the heat conductor and the electrode assembly, it is not necessary to determine which side is used to contact the electrode assembly during the manufacturing process of the heat conductor, making the manufacturing of the heat conductor more convenient.

[0018] In some embodiments, the non-depth dimension of the first through hole increases, and the non-depth dimension is the dimension perpendicular to the depth direction of the first through hole.

[0019] By increasing the non-depth dimension of the first through hole along the direction from near the tab to away from the tab, the thermal conductivity of the heat conductor to the electrode assembly decreases, thereby reducing the temperature difference between the part of the electrode assembly near the tab and the part away from the tab.

[0020] In some embodiments, the first part has a second through hole, the second part has a third through hole, and the distribution density of the second through hole is greater than the distribution density of the third through hole.

[0021] By making the through-hole density of the second through-hole array greater than that of the third through-hole array, the contact area between the first part and the third part of the electrode assembly can be made greater than the contact area between the second part and the fourth part of the electrode assembly, thereby reducing the temperature difference between the third and fourth parts of the electrode assembly. Moreover, by setting the through-hole structure to reduce the contact area between the heat-conducting component and the electrode assembly, it is not necessary to determine which side is used to contact the electrode assembly during the manufacturing process of the heat-conducting component, making the manufacturing of the heat-conducting component more convenient. Furthermore, the third through-hole of the second part of the heat-conducting component can be formed in one step.

[0022] In some embodiments, the non-depth dimension of the second through hole is smaller than the non-depth dimension of the third through hole, wherein the non-depth dimension of the second through hole is a dimension perpendicular to the depth direction of the second through hole, and the non-depth dimension of the third through hole is a dimension perpendicular to the depth direction of the third through hole.

[0023] By making the dimension of the second through hole in the non-depth direction larger than that of the third through hole, the contact area between the first part and the third part of the electrode assembly can be made larger than the contact area between the second part and the fourth part of the electrode assembly, thereby reducing the temperature difference between the third part and the fourth part.

[0024] In some embodiments, the heat-conducting component includes a first fixing part and a plurality of first heat-conducting strips, each of the first heat-conducting strips being fixedly connected to the first fixing part, and the first heat-conducting strips being spaced apart, with the spacing between adjacent first heat-conducting strips increasing along the direction from the tab to the distance from the tab.

[0025] By increasing the spacing between adjacent first heat-conducting strips in the direction from near the tab to away from the tab, the heat conduction capacity of the heat-conducting element decreases, thereby reducing the temperature difference between the part of the electrode assembly near the tab and the part away from the tab. Furthermore, by forming a hollow structure with the first fixing part and multiple first heat-conducting strips, it is possible to eliminate the need to remove the heat-conducting element after it has been formed. That is, the contact area between the heat-conducting element and the electrode assembly is reduced in a non-subtractive manner, thereby saving more manufacturing materials for the heat-conducting element and further reducing the manufacturing cost of the heat-conducting element.

[0026] In some embodiments, the extension direction of the first fixing part is parallel to the first direction, and the two ends of each first heat-conducting strip are respectively fixed to the first fixing part; each first heat-conducting strip extends along the second direction, and each first heat-conducting strip is spaced apart along the first direction, and the spacing between adjacent first heat-conducting strips increases; wherein, the first direction is from the direction close to the electrode tab to the direction away from the electrode tab, and the second direction is perpendicular to the first direction.

[0027] By arranging each of the first heat-conducting strips along the first direction, it is possible to control the contact area between the heat-conducting element and the electrode assembly in the first direction while only needing to form a heat-conducting array, thereby simplifying the structure of the heat-conducting element.

[0028] In some embodiments, the number of first fixing parts is at least three, each first fixing part is spaced apart in a first direction and extends along a second direction to form a plurality of heat-conducting regions in the first direction; the ends of a plurality of first heat-conducting strips are respectively fixed to adjacent first fixing parts, and in each heat-conducting region, each first heat-conducting strip is spaced apart along the second direction, and the spacing between adjacent first heat-conducting strips in each heat-conducting region in the first direction decreases; wherein, the first direction is from the direction near the electrode tab to the direction away from the electrode tab, and the second direction is perpendicular to the first direction.

[0029] By increasing the spacing between adjacent first heat-conducting strips within each heat-conducting cluster in the first direction, the thermal conductivity of the heat-conducting element decreases, thereby reducing the temperature difference between the portion of the electrode assembly near the tab and the portion far from the tab. Furthermore, by forming multiple heat-conducting clusters in the first direction with each first heat-conducting strip, the contact area between each heat-conducting cluster and the electrode assembly can be controlled by adjusting the spacing between the first heat-conducting strips within the heat-conducting cluster, thus making it easier to control the contact area between the heat-conducting element and each part of the electrode assembly.

[0030] In some embodiments, the heat-conducting element includes a second fixing part and a plurality of second heat-conducting strips, each of the second heat-conducting strips being fixedly connected to the second fixing part. Along the direction from near the electrode tab to away from the electrode tab, the width dimension of each second heat-conducting strip decreases, and the width direction is perpendicular to the extension direction of the second heat-conducting strip.

[0031] By decreasing the width of the second heat-conducting strip from the direction closer to the tab to the direction farther from the tab, heat from the part of the electrode assembly closer to the tab can be quickly conducted to the part of the electrode assembly farther from the tab, thereby reducing the temperature difference between different parts of the electrode assembly.

[0032] In some embodiments, the first part includes a third fixing part and a plurality of third heat-conducting strips, each third heat-conducting strip being fixedly connected to the third fixing part and the third heat-conducting strips being spaced apart; the second part includes a fourth fixing part and a plurality of fourth heat-conducting strips, each fourth heat-conducting strip being fixedly connected to the fourth fixing part and the fourth heat-conducting strips being spaced apart; wherein the spacing between adjacent third heat-conducting strips is smaller than the spacing between adjacent fourth heat-conducting strips.

[0033] By making the density of the first heat-conducting array greater than that of the second heat-conducting array, the contact area between the first part and the third part of the electrode assembly can be made greater than the contact area between the second part and the fourth part of the electrode assembly, thereby reducing the temperature difference between the third and fourth parts. Furthermore, by forming a perforated structure using multiple second heat-conducting strips and by forming a perforated structure using the third heat-conducting strip, it is possible to reduce the contact area between the heat-conducting element and the electrode assembly without removing parts of the heat-conducting element after its formation. This achieves a reduction in the contact area between the heat-conducting element and the electrode assembly through a non-subtractive manufacturing method, further saving manufacturing materials and reducing the manufacturing cost of the heat-conducting element.

[0034] In some embodiments, the first part includes a fifth fixing part and a plurality of fifth heat-conducting strips, each fifth heat-conducting strip being fixedly connected to the fifth fixing part and spaced apart; the second part includes a sixth fixing part and a plurality of sixth heat-conducting strips, each sixth heat-conducting strip being fixedly connected to the sixth fixing part and spaced apart; the width dimension of the fifth heat-conducting strip is greater than the width dimension of the sixth heat-conducting strip, the width direction of the fifth heat-conducting strip is perpendicular to the extension direction of the fifth heat-conducting strip, and the width direction of the sixth heat-conducting strip is perpendicular to the extension direction of the sixth heat-conducting strip.

[0035] By making the width dimension of the fifth heat-conducting strip larger than the width dimension of the sixth heat-conducting strip, the contact area between the first part and the third part of the electrode assembly can be made larger than the contact area between the second part and the fourth part of the electrode assembly, thereby reducing the temperature difference between the third and fourth parts.

[0036] In some embodiments, the heat-conducting element includes a plurality of seventh heat-conducting strips, which are arranged in an alternating pattern to form a first mesh structure; the mesh density of the first mesh structure decreases in the direction from near the tab to away from the tab.

[0037] By decreasing the mesh density of the first mesh structure from near the tab to away from the tab, the thermal conductivity of the heat-conducting component decreases, thereby reducing the temperature difference between the part of the electrode assembly near the tab and the part away from the tab. Furthermore, by forming the first mesh structure with multiple interlaced and mutually fixed seventh heat-conducting strips, the fixing points of each seventh heat-conducting strip can be increased, thereby improving the structural strength of the heat-conducting component.

[0038] In some implementations, the spacing between adjacent seventh heat-conducting strips increases in the direction from the tab to the distance from the tab.

[0039] By adjusting the spacing of the seventh heat-conducting strips, the mesh density of the first mesh structure decreases in the first direction, thereby reducing the heat conduction capacity of the heat-conducting component. This reduces the temperature difference between the portion of the electrode assembly near the tab and the portion far from the tab. Furthermore, by adjusting the mesh density of the first mesh structure through the spacing of the seventh heat-conducting strips, the width dimensions of each seventh heat-conducting strip can be made the same, thus reducing the manufacturing cost of the seventh heat-conducting strips.

[0040] In some implementations, the width dimension of the seventh heat-conducting strip decreases in the direction from near the tab to away from the tab, and the width direction is perpendicular to the extension direction of each seventh heat-conducting strip.

[0041] By adjusting the width dimension of the seventh heat-conducting strip, the mesh density of the first mesh structure is achieved, thereby reducing the heat conduction capacity of the heat-conducting element. This reduces the temperature difference between the part of the electrode assembly near the tab and the part far from the tab. Furthermore, by adjusting the width dimension of the seventh heat-conducting strip in both directions, the contact area of ​​the heat-conducting element in the first direction can be varied more significantly, thus enhancing the heat-conducting element's ability to reduce the temperature difference between different parts of the electrode assembly.

[0042] In some embodiments, the first part includes a plurality of eighth heat-conducting strips, which are arranged in an alternating manner to form a second mesh structure; the second part includes a plurality of ninth heat-conducting strips, which are arranged in an alternating manner to form a third mesh structure; the mesh density of the second mesh structure is less than the mesh density of the third mesh structure.

[0043] By making the mesh density of the second mesh structure greater than that of the third mesh structure, the contact area between the first part and the third part of the electrode assembly is greater than the contact area between the second part and the fourth part of the electrode assembly, thereby reducing the temperature difference between the third and fourth parts of the electrode assembly. Furthermore, by forming the second mesh structure with multiple interlaced and mutually fixed eighth heat-conducting strips, and forming the third mesh structure with interlaced and mutually fixed ninth heat-conducting strips, the number of fixing points of each heat-conducting strip can be increased, thereby improving the structural strength of the heat-conducting component.

[0044] In some implementations, the spacing between adjacent eighth heat-conducting strips is smaller than the spacing between adjacent ninth heat-conducting strips.

[0045] By controlling the spacing of the eighth and ninth heat-conducting strips, the first mesh structure becomes a denser mesh structure, and the second mesh structure becomes a sparser mesh structure. This results in a higher mesh density in the first mesh structure than in the second mesh structure, thus increasing the contact area between the first part and the third part of the electrode assembly compared to the contact area between the second part and the fourth part of the electrode assembly. This reduces the temperature difference between the third and fourth parts of the electrode assembly. Furthermore, by controlling the spacing of each heat-conducting strip and the mesh density of the mesh structure, the width of each heat-conducting strip can be made the same, reducing the manufacturing difficulty of the heat-conducting strips.

[0046] In some embodiments, the width dimension of the eighth heat-conducting strip is greater than the width dimension of the ninth heat-conducting strip, the width direction of the eighth heat-conducting strip is perpendicular to the extension direction of the eighth heat-conducting strip, and the width direction of the ninth heat-conducting strip is perpendicular to the extension direction of the ninth heat-conducting strip.

[0047] By adjusting the width dimension of each heat-conducting strip, the contact area between the first part and the third part of the electrode assembly is made larger than the contact area between the second part and the fourth part of the electrode assembly, thereby reducing the temperature difference between the third and fourth parts of the electrode assembly. Moreover, by controlling the mesh density of the mesh structure by adjusting the width dimension of the heat-conducting strip, it is not necessary to accurately control the spacing of each heat-conducting strip, thus reducing the assembly difficulty of each heat-conducting strip.

[0048] In some implementations, the first part and the second part are two separate parts, and the first part and the second part are in contact.

[0049] By making the first part and the second part into two separate structures and making the first part and the two parts in contact, heat exchange can be carried out between the first part and the second part, while reducing the assembly difficulty of the heat-conducting components.

[0050] In some implementations, the first part and the second part are connected.

[0051] By connecting the first part and the second part to form an integrated heat-conducting component structure, heat exchange can be achieved between the first part and the second part while reducing the manufacturing cost of the heat-conducting component.

[0052] A second aspect of this application provides a battery device, which includes a housing with an internal accommodating space and at least one battery cell as provided in the first aspect above, each battery cell being located within the accommodating space.

[0053] A third aspect of this application provides an electrical device that includes a battery device as provided in the second aspect above, the battery device being used to provide electrical energy.

[0054] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0055] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0056] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0057] Figure 2 An exploded view of a battery device provided in an embodiment of this application;

[0058] Figure 3 An exploded view of a single battery cell provided in an embodiment of this application;

[0059] Figure 4 This is a graph showing the temperature changes of different parts of the electrode assembly during the charging process of a single battery cell.

[0060] Figure 5 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0061] Figure 6 A schematic diagram of the structure of the first type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0062] Figure 7 This is a schematic diagram of the structure of the second type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0063] Figure 8 This is a schematic diagram of the structure of the third type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0064] Figure 9 This is a schematic diagram of the structure of the fourth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0065] Figure 10 This is a schematic diagram of the structure of the fifth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0066] Figure 11 A schematic diagram of the structure of the sixth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0067] Figure 12 A schematic diagram of the structure of the seventh type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0068] Figure 13 A schematic diagram of the structure of the eighth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0069] Figure 14 A schematic diagram of the structure of the ninth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0070] Figure 15 This is a schematic diagram of the structure of the tenth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0071] Figure 16 An assembly diagram of the casing, electrode assembly, and heat-conducting component in a battery cell provided in an embodiment of this application;

[0072] Figure 17 A schematic diagram of the structure of the eleventh type of heat-conducting element in a battery cell provided in an embodiment of this application;

[0073] Figure 18 This is a schematic diagram of the structure of the twelfth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0074] Figure 19 A schematic diagram of the thirteenth heat-conducting component in a battery cell provided in an embodiment of this application;

[0075] Figure 20 A schematic diagram of the structure of the fourteenth heat-conducting element in a battery cell provided in an embodiment of this application;

[0076] Figure 21 This is a schematic diagram of the structure of the fifteenth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0077] Figure 22A schematic diagram of the structure of the sixteenth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0078] Figure 23 This is a schematic diagram of the structure of the seventeenth type of heat-conducting component in a battery cell provided in an embodiment of this application;

[0079] Figure 24 This is a schematic diagram of the structure of the eighteenth type of heat-conducting component in a battery cell provided in an embodiment of this application.

[0080] Explanation of reference numerals in the attached figures

[0081] 1000, vehicles;

[0082] 100. Battery assembly; 200. Controller; 300. Motor;

[0083] 10. Box body; 11. First cover; 12. Second cover;

[0084] 20. Battery cell; 21. Housing; 211. Receiving cavity; 212. Housing body; 213. End cap; 214. Electrode terminal; 215. Conductive sheet; 216. Vent; 217. Vent valve; 218. Explosion-proof valve; 22. Electrode assembly; 221. Electrode tab; 23. Thermal conductive element; 233. First groove; 234. First through hole; 2351. First fixing part; 2352. First thermal conductive strip; 2361. Second fixing part; 2362. Second thermal conductive strip; 2371. Seventh thermal conductive strip; 2372. First mesh structure; 231. First part; 232. Second part; 2311. Second groove; 2321. Third groove; 2312. Second through hole; 2322. Third through hole; 23131. Third fixing part; 23132. Third heat-conducting strip; 23231. Fourth fixing part; 23232. Fourth heat-conducting strip; 23141. Fifth fixing part; 23142. Fifth heat-conducting strip; 23241. Sixth fixing part; 23242. Sixth heat-conducting strip; 23151. Eighth heat-conducting strip; 23152. Second mesh structure; 23251. Ninth heat-conducting strip; 23252. Third mesh structure. Detailed Implementation

[0085] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0087] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0088] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0089] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0090] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0091] In the description of the embodiments of this application, the technical 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 only for the convenience of describing the embodiments of this application 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 the embodiments of this application.

[0092] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0093] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. The technical solutions described in this application are applicable to various electrical devices that use individual battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0094] The battery device contains a battery cell, and the battery cell contains at least one electrode assembly. During the charging and discharging process of the battery device, different parts of the electrode assembly generate different amounts of heat. Specifically, the part of the electrode assembly near the tab generates more heat than the part away from the tab; the part of the electrode assembly located between the electrode assembly and the battery cell casing generates more heat than the part between two adjacent electrode assemblies. For ease of explanation, the part of the electrode assembly that generates more heat is referred to as the high-heat region, and the part that generates less heat is referred to as the low-heat region. It is necessary to set a large thermal bond in the battery cell to transfer heat from the high-heat region to the low-heat region, thereby reducing the temperature difference between the parts of the electrode assembly. The heat-conducting element is located between the electrode assembly and the battery cell casing, and the heat-conducting element is also located between adjacent electrode assemblies.

[0095] To further reduce the temperature difference between different parts of the electrode assembly, the applicant considered adjusting the thermal conductivity of different parts of the heat-conducting component. The heat-conducting component in contact with the high-heat area should have a higher thermal conductivity than that in contact with the low-heat area, thus allowing heat to be transferred more quickly from the high-heat area to the low-heat area and providing some insulation to the low-heat area. Furthermore, even if those skilled in the art could conceive of setting different thermal conductivity values ​​for different parts of the heat-conducting component, since heat-conducting components are generally used to conduct heat from the electrode assembly to the battery cells, it is generally believed that the thermal conductivity of the heat-conducting component in contact with the high-heat area should be increased to reduce thermal runaway in the battery cells, thereby improving the safety of the battery cells while reducing the temperature difference between the high-heat and low-heat areas. However, the applicant further recognizes that the thermal conductivity structure of this application is only used to reduce the temperature difference between the high-heat and low-heat areas; that is, the purpose of the thermal conductivity structure of this application is to achieve temperature uniformity in the electrode assembly, and the current heat-conducting component already possesses sufficient thermal conductivity. The thermal conductivity of the component is already sufficient. Furthermore, increasing the thermal conductivity of the component in contact with high-heat areas beyond what is already sufficient would lead to an increase in the component's volume or cost. Recognizing this problem, the applicant overcame the technical biases of those skilled in the art and adopted a technical solution opposite to the above approach. By using recesses or perforations, the thermal conductivity of the component is weakened to varying degrees. This results in a higher perforation density or number in the portion of the thermal structure in contact with low-heat areas and a lower perforation density or number in the portion in contact with high-heat areas. This leads to a larger contact area between the thermal component and high-heat areas, and a smaller contact area between the thermal component and low-heat areas. This achieves the technical effect of giving the portion of the thermal component in contact with high-heat areas a greater thermal conductivity than the portion in contact with low-heat areas, thus improving the temperature difference between different parts of the battery cell, reducing the space occupied by the thermal component, and lowering its manufacturing cost.

[0096] This application embodiment also provides a battery, which includes a battery cell and the aforementioned housing, a positive electrode, a negative electrode, a separator, an insulating material, and tabs, for storing or outputting electrical energy. At least one battery cell is housed in the housing, thereby protecting the battery cell through the housing. The battery also includes a copper plate, which is used to connect multiple battery cells in series and extend out of the housing, thereby enabling the output of electrical energy from the battery cells.

[0097] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0098] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0099] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first cover 11 and a second cover 12, which overlap each other, collectively defining a space for accommodating the battery cell 20. The second cover 12 may be a hollow structure with one open end, and the first cover 11 may be a plate-like structure, with the first cover 11 covering the open side of the second cover 12 so that the first cover 11 and the second cover 12 together define the space. Alternatively, both the first cover 11 and the second cover 12 may be hollow structures with one open side, with the open side of the first cover 11 overlapping the open side of the second cover 12. Of course, the box 10 formed by the first cover 11 and the second cover 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0101] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0102] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20. Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0103] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0104] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0105] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0106] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0107] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0108] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0109] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0110] The structure of the battery cell 20 is as follows Figure 3As shown, the battery cell 20 includes a housing 21 and an electrode assembly 22. The housing 21 has a receiving cavity 211, and the electrode assembly 22 is located within the receiving cavity 211. The electrode assembly 22 is used to contain electrolyte, positive electrode plates, and negative electrode plates. A separator is usually provided between the positive and negative electrode plates. The non-active parts of the positive and negative electrode plates each form a tab 221. The housing 21 includes a housing body 212 and an end cap 213. The housing body 212 forms an opening, and the end cap 213 is used to seal the opening to surround and form the receiving cavity 211. The end cap 213 has electrode terminals 214. The electrode terminals 214 are connected to the positive electrode tab 221 and the negative electrode tab 221 of each electrode assembly 22 respectively through conductive sheets 215, thereby forming the positive electrode terminal 214 and the negative electrode terminal 214. During the charging and discharging process of the battery cell... The positive and negative active materials react with the electrolyte, and the tabs 221 connect to the electrode terminals 214 to form a current loop. The end cap 213 also has an exhaust valve 217 and an exhaust port 216. The exhaust port 216 is connected to the receiving cavity 211. The exhaust valve 217 can control the opening and closing of the exhaust port 216. When it is necessary to discharge gas from the receiving cavity 211, the exhaust valve 217 is opened so that the gas in the receiving cavity 211 can be discharged through the exhaust port 216. After venting is completed, the exhaust valve 217 is closed so that the receiving cavity 211 remains sealed. The end cap 213 also has an explosion-proof valve 218. In the event of thermal runaway at the battery cell 20, the pressure in the receiving cavity 211 will force open the explosion-proof valve 218, allowing the contents of the receiving cavity 211 to be discharged from the explosion-proof valve 218 to form emissions, thereby reducing the risk of battery cell 20 explosion. Optionally, the number of electrode assemblies 22 in the receiving cavity 211 can be one or more. The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0111] During the use of the battery cell 20, different parts of the battery cell 20 generate different amounts of heat. The following section discusses this further. Figure 3 and Figure 4 The temperature distribution of different parts of the electrode assembly 22 during the charging process of the battery cell 20 is described. Figure 4 The image shows the temperature change curves of the upper, middle, and lower parts of the JR (Jellyroll, electrode assembly) of the battery cell 20 during the charging process as the SOC (State of Charge, indicating the remaining capacity of the battery) increases. It should be noted that... Figure 4 The tabs of the electrode assembly are located at the top of the electrode assembly, such as... Figure 4As shown, during the charging process, the temperature of the part of the electrode assembly 22 closer to the tab 221 is higher, and the temperature of the part of the electrode assembly 22 further away from the tab 221 is lower.

[0112] To reduce the temperature difference between different parts of the electrode assembly 22, it is necessary to achieve temperature uniformity in all parts of the electrode assembly 22 through heat-conducting components. Specifically, for example... Figure 5 As shown, the battery cell 20 also includes a heat-conducting element 23, which is located between the electrode assembly 22 and the inner wall of the receiving cavity 211 and is in contact with the electrode assembly 22. Through the contact between the heat-conducting element 23 and different parts of the electrode assembly 22, the heat is conducted from the hotter parts of the electrode assembly 22 to the cooler parts, thereby reducing the temperature difference between the different parts of the electrode assembly 22. Specifically, the contact area between the heat-conducting element 23 and the electrode assembly 22 decreases from near the tab 221 to away from the tab 221, thus reducing the heat conduction capacity of the heat-conducting element 23. This allows the temperature of the part near the tab 221 to be transferred to the part away from the tab 221 more quickly, and allows heat to be dissipated from the part away from the tab 221 at a slower rate, thereby further reducing the temperature difference between the different parts of the electrode assembly 22.

[0113] This application provides a battery cell comprising a housing with an internal cavity, an electrode assembly located within the cavity, and a heat-conducting element located within the cavity. The electrode assembly has tabs, and the heat-conducting element contacts the electrode assembly. The contact area between the heat-conducting element and the electrode assembly decreases from near the tabs to away from the tabs. This means that during the use of the battery cell, the heat generated near the tabs of the electrode assembly is greater than the heat generated away from the tabs. By decreasing the contact area between the heat-conducting element and the electrode assembly from near the tabs to away from the tabs, the heat from the near-tabs portion of the electrode assembly can be conducted more quickly to the portion away from the tabs, reducing heat loss from the portion away from the tabs. This reduces the temperature difference between different parts of the electrode assembly without increasing the size of the heat-conducting element or replacing its material with a more expensive material with higher thermal conductivity.

[0114] It should be noted that the contact area between the heat-conducting element 23 and the electrode assembly 22 can be controlled by different structures. For example, multiple grooves are provided on the surface of the heat-conducting element 23 for contacting the electrode assembly 22. The contact area between different parts of the heat-conducting element 23 and the electrode assembly 22 is controlled by controlling the size of each groove. For example, the size of the groove increases from the direction closer to the tab 221 to the direction farther away from the tab 221, thereby decreasing the contact area between the heat-conducting element 23 and the electrode assembly 22. For example, the heat-conducting element 23 includes multiple interlaced heat-conducting strips forming a mesh structure. The contact area between different parts of the heat-conducting element 23 and the electrode assembly 22 is controlled by controlling the mesh density of the mesh structure. For example, the mesh density decreases from the direction closer to the tab 221 to the direction farther away from the tab 221, thereby decreasing the contact area between the heat-conducting element 23 and the electrode assembly 22. The following describes, through different embodiments, a structure in which the contact area between the heat-conducting element 23 and the electrode assembly 22 decreases from the direction closer to the tab 221 to the direction farther away from the tab 221.

[0115] In some embodiments, combined with Figure 5 and Figure 6 The surface of the heat-conducting element 23 facing the electrode assembly 22 has a plurality of first grooves 233. The distribution density of the first grooves 233 increases from near the tab 221 to away from the tab 221. This can be understood as the plurality of first grooves 233 being disposed on the surface of the heat-conducting element 23 that contacts the electrode assembly 22, thereby forming an array of first grooves 233 on that surface. The greater the distribution density of the array of first grooves 233, the smaller the contact area between the heat-conducting element 23 and the electrode assembly 22. This is achieved by increasing the distribution density from near the tab 221 to away from the tab 221. In the direction of the first groove 233, the distribution density increases, which reduces the contact area between the heat-conducting element 23 and the electrode assembly 22. This reduces the heat conduction capacity of the heat-conducting element 23 to the electrode assembly 22, thereby reducing the temperature difference between the part of the electrode assembly 22 near the tab 221 and the part away from the tab 221. Moreover, since the groove does not need to penetrate the heat-conducting element 23, the heat conduction capacity of each part of the heat-conducting element 23 can meet the requirements while giving the heat-conducting element 23 sufficient structural strength and a longer service life.

[0116] In some embodiments, combined with Figure 5 and Figure 7The surface of the heat-conducting element 23 facing the electrode assembly 22 has a plurality of first grooves 233. The non-depth dimension of the first grooves 233 increases in the direction from near the tab 221 to away from the tab 221. The non-depth dimension is the dimension perpendicular to the depth direction of the first groove 233. It can be understood that the plurality of first grooves 233 are disposed on the surface of the heat-conducting element 23 that contacts the electrode assembly 22, thereby forming an array of first grooves 233 on the surface. The larger the non-depth dimension of the first groove 233, the smaller the contact area between the heat-conducting element 23 and the electrode assembly 22. By increasing the non-thickness dimension of the first grooves 233 in the direction from near the tab 221 to away from the tab 221, the contact area between the heat-conducting element 23 and the electrode assembly 22 can be reduced, thereby reducing the heat conduction capacity of the heat-conducting element 23 to the electrode assembly 22, and thus reducing the temperature difference between the part of the electrode assembly 22 near the tab 221 and the part away from the tab 221.

[0117] In some embodiments, combined with Figure 5 and Figure 8 The heat-conducting element 23 has multiple first through holes 234. The distribution density of the first through holes 234 increases in the direction from near the tab 221 to away from the tab 221. It can be understood that the multiple first through holes 234 form an array. The greater the distribution density of the first through holes 234, the smaller the contact area between the heat-conducting element 23 and the electrode assembly 22. By increasing the distribution density of the first through holes 234 in the direction from near the tab 221 to away from the tab 221, the heat conduction capacity of the heat-conducting element 23 to the electrode assembly 22 decreases. This reduces the temperature difference between the part of the electrode assembly 22 near the tab 221 and the part away from the tab 221. Moreover, by reducing the contact area between the heat-conducting element 23 and the electrode assembly 22 by setting the through hole structure, it is not necessary to determine which side is used to contact the electrode assembly 22 during the manufacturing process of the heat-conducting element 23, making the manufacturing of the heat-conducting element 23 more convenient.

[0118] In some embodiments, combined with Figure 5 and Figure 9 The heat-conducting element 23 has a plurality of first through holes 234. The non-depth dimension of the first through holes 234 increases along the direction from near the tab 221 to away from the tab 221. It can be understood that the plurality of first through holes 234 form an array. The larger the non-depth dimension of the first through holes 234, the smaller the contact area between the heat-conducting element 23 and the electrode assembly 22. By increasing the non-depth dimension of the first through holes 234 along the direction from near the tab 221 to away from the tab 221, the heat conduction capacity of the heat-conducting element 23 to the electrode assembly 22 decreases, thereby reducing the temperature difference between the part of the electrode assembly 22 near the tab 221 and the part away from the tab 221.

[0119] In some implementations, combined Figure 5 and Figure 10The heat-conducting component 23 includes a first fixing part 2351 and first heat-conducting strips 2352. Each first heat-conducting strip 2352 is fixedly connected to the first fixing part 2351, and the first heat-conducting strips 2352 are spaced apart. Along the direction from near the electrode tab 221 to away from the electrode tab 221, the spacing between adjacent first heat-conducting strips 2352 increases. It can be understood that multiple first heat-conducting strips 2352 are spaced apart in one direction, and the position of each first heat-conducting strip 2352 is fixed by at least one first fixing part 2351, thereby forming at least one heat-conducting strip array. Within the same heat-conducting strip array, the larger the spacing between adjacent first heat-conducting strips 2352, the better the connection between the heat-conducting component 23 and the electrode assembly 2. The smaller the contact area of ​​the first heat-conducting strip 2352, the smaller the spacing between adjacent first heat-conducting strips 2352, which decreases the thermal conductivity of the heat-conducting element 23 by increasing the spacing between adjacent first heat-conducting strips 2352 in the direction from near the electrode tab 221 to away from the electrode tab 221. This reduces the temperature difference between the portion of the electrode assembly 22 near the electrode tab 221 and the portion away from the electrode tab 221. Furthermore, by forming a hollow structure with the first fixing part 2351 and multiple first heat-conducting strips 2352, it is possible to reduce the contact area between the heat-conducting element 23 and the electrode assembly 22 without removing a portion of the heat-conducting element 23 after its formation. In other words, the contact area between the heat-conducting element 23 and the electrode assembly 22 is reduced through a non-subtractive method, thereby saving more manufacturing material for the heat-conducting element 23 and further reducing its manufacturing cost. It should be noted that the form of the heat-conducting strip array varies depending on the direction of the spacing of the first heat-conducting strips 2352. The following will be discussed in conjunction with... Figure 10 and Figure 11 The different forms of the heat-conducting strip are illustrated by example. For ease of explanation, the direction from the tab 221 to the distance from the tab 221 will be referred to as the first direction, and the direction perpendicular to the first direction will be referred to as the second direction.

[0120] like Figure 10 As shown, the extending direction of the first fixing part 2351 is the same as the first direction (the first direction is as shown in the figure). Figure 10 As shown by arrow I, the ends of each first heat-conducting strip 2352 are fixed to the first fixing part 2351, and each first heat-conducting strip 2352 extends along the second direction (as shown by arrow I). Figure 10As indicated by arrow II, each of the first heat-conducting strips 2352 is spaced apart along the first direction, and the spacing between adjacent first heat-conducting strips 2352 increases progressively. This can be understood as each of the first heat-conducting strips 2352 forming a heat-conducting strip array in the first direction. The increasing spacing between the first heat-conducting strips 2352 in this array reduces the heat conduction capacity of the heat-conducting element 23, thereby reducing the temperature difference between the portion of the electrode assembly 22 near the tab 221 and the portion far from the tab 221. Furthermore, by arranging each of the first heat-conducting strips 2352 along the first direction, it is possible to control the contact area between the heat-conducting element 23 and the electrode assembly 22 in the first direction while only needing to form a heat-conducting array, thus simplifying the structure of the heat-conducting element 23. In this configuration, both ends of each first heat-conducting strip 2352 are fixed to the first fixing part 2351, thereby keeping the relative position of each first heat-conducting strip 2352 fixed. Optionally, there is one first fixing part 2351. The first heat-conducting strip 2352 surrounds the electrode assembly 22 and its ends are fixed to the same first fixing part 2351. Optionally, there are multiple first fixing parts 2351. The multiple first fixing parts 2351 are arranged circumferentially around the electrode assembly 22. The two ends of the first heat-conducting strip 2352 located between two adjacent first fixing parts 2351 are respectively fixed to the two first fixing parts 2351.

[0121] like Figure 11 As shown, the number of first fixing parts 2351 is at least three. Each first fixing part 2351 is spaced apart in a first direction and extends along a second direction to form multiple heat-conducting regions S1 in the first direction. Each first heat-conducting strip 2352 is spaced apart in each heat-conducting region S1 along the second direction. In the first direction, the spacing between adjacent first heat-conducting strips 2352 in each heat-conducting region S1 increases progressively. This can be understood as the first heat-conducting strips 2352 forming multiple heat-conducting clusters in each heat-conducting region S1. Each heat-conducting cluster is located in one heat-conducting region S1, and each heat-conducting cluster includes at least two first heat-conducting strips 235. 2. Furthermore, each heat-conducting cluster is arranged along a first direction. In the first direction, the spacing between adjacent first heat-conducting strips 2352 within each heat-conducting cluster increases, thereby reducing the heat conduction capacity of the heat-conducting component 23. This reduces the temperature difference between the portion of the electrode assembly 22 near the tab 221 and the portion away from the tab 221. Moreover, by forming multiple heat-conducting clusters with each first heat-conducting strip 2352 in the first direction, the contact area between each heat-conducting cluster and the electrode assembly 22 can be controlled by the spacing of the first heat-conducting strips 2352 within the heat-conducting cluster. This makes it easier to control the contact area between the heat-conducting component 23 and each part of the electrode assembly 22.

[0122] In some embodiments, combining 5 and Figure 12The heat-conducting component 23 includes a second fixing part 2361 and a plurality of second heat-conducting strips 2362. Each second heat-conducting strip 2362 is fixedly connected to the second fixing part 2361. Along the direction from near the tab 221 to away from the tab 221, the width of each second heat-conducting strip 2362 decreases progressively. The width direction is perpendicular to the extension direction of the second heat-conducting strip. It should be noted that the width of the second heat-conducting strip 2362 varies depending on its extension direction. The following will describe the variation in width in conjunction with... Figure 12 and Figure 13 The width variation of the second heat-conducting strip 2362 is illustrated by way of example. For ease of explanation, the direction from the tab 221 to the distance from the tab 221 will be referred to as the first direction, and the direction perpendicular to the first direction will be referred to as the second direction.

[0123] like Figure 12 As shown, the second heat-conducting strip 2362 extends along the first direction, and the second direction is the width direction of the second heat-conducting strip 2362. The width of at least one second heat-conducting strip 2362 decreases in the first direction. This can be understood as reducing the size of the width of a single second heat-conducting strip 2362 in the first direction, thereby reducing the heat conduction capacity of the heat-conducting component 23. This reduces the temperature difference between the part of the electrode assembly 22 near the tab 221 and the part away from the tab 221. By adjusting the width of a single second heat-conducting strip 2362, the structure of each second heat-conducting strip 2362 is made the same. Therefore, it is not necessary to process second heat-conducting strips 2362 of different sizes separately, nor is it necessary to distinguish between second heat-conducting strips 2362 of different sizes during assembly, thereby reducing the assembly difficulty of the second heat-conducting strip 2362.

[0124] like Figure 13 As shown, the second heat-conducting strip 2362 extends along a second direction, and the first direction is the width direction of the second heat-conducting strip 2362. In the first direction, the dimensions of each second heat-conducting strip 2362 decrease in the width direction. This can be understood as the second heat-conducting strip 2362 having the same width direction dimension in the second direction, but different width direction dimensions for each second heat-conducting strip 2362. The decreasing width direction dimension of each second heat-conducting strip 2362 in the first direction reduces the heat conduction capacity of the heat-conducting component 23, thereby reducing the temperature difference between the portion of the electrode assembly 22 near the tab 221 and the portion far from the tab 221. Moreover, the width direction dimension of a single second heat-conducting strip 2362 is uniform, thereby reducing the manufacturing difficulty of a single second heat-conducting strip 2362.

[0125] In some embodiments, combined with Figure 5 and Figure 14The heat-conducting component 23 includes multiple seventh heat-conducting strips 2371, which are arranged in an alternating pattern to form a first mesh structure 2372. The mesh density of the first mesh structure 2372 decreases from near the tab 221 to away from the tab 221. This can be understood as one part of the seventh heat-conducting strips 2371 extending in one direction and another part extending in another direction, allowing the two parts of the seventh heat-conducting strips 2371 to be arranged in an alternating pattern. The overlapping portions of the two alternating parts of the seventh heat-conducting strips 2371 are... The first mesh structure 2372 is formed by fixing the electrodes. By decreasing the mesh density of the first mesh structure 2352 from near the tab 221 to away from the tab 221, the thermal conductivity of the heat-conducting element 23 decreases, thereby reducing the temperature difference between the portion of the electrode assembly 22 near the tab 221 and the portion away from the tab 221. Furthermore, by forming the first mesh structure 2372 with multiple interlaced and mutually fixed seventh heat-conducting strips 2371, the fixing points of each seventh heat-conducting strip 2371 are increased, thereby improving the structural strength of the heat-conducting element 23. The following is in conjunction with... Figure 14 and Figure 15 The implementation of the decreasing mesh density of the first mesh structure 2372 is illustrated by way of example. For ease of explanation, the direction from the tab 221 to the tab 221 away from the tab 221 is referred to as the first direction, and the direction perpendicular to the first direction is referred to as the second direction.

[0126] like Figure 14 As shown, in the first direction, the spacing between adjacent seventh heat-conducting strips 2371 increases. This can be understood as changing the mesh density of the first mesh structure 2372 by changing the spacing of the seventh heat-conducting strips 2371. For example, the seventh heat-conducting strips 2371 in the first part extend along the first direction and are spaced apart along the second direction, and the seventh heat-conducting strips 2371 in the second part extend along the second direction and are spaced apart along the first direction. In the first direction, the spacing between adjacent seventh heat-conducting strips 2371 in the second part increases, thereby reducing the heat conduction capacity of the heat-conducting element 23. This reduces the temperature difference between the part of the electrode assembly 22 near the tab 221 and the part far from the tab 221. Moreover, by adjusting the mesh density of the first mesh structure 2372 by adjusting the spacing of the seventh heat-conducting strips 2371, the width dimension of each seventh heat-conducting strip 2371 can be made the same, thereby reducing the manufacturing cost of the seventh heat-conducting strips 2371.

[0127] like Figure 15As shown, in the first direction, the width dimension of the seventh heat-conducting strip 2371 decreases progressively. This can be understood as adjusting the width dimension of the seventh heat-conducting strip 2371 to achieve the mesh density of the first mesh structure 2372. The width direction is perpendicular to the extension direction of the seventh heat-conducting strip 2371. For example, a portion of the seventh heat-conducting strip 2371 extends along the first direction and is spaced apart along the second direction, while another portion extends along the second direction and is spaced apart along the first direction. The dimension of each portion of the seventh heat-conducting strip 2371 in the first direction... The size of the seventh heat-conducting strip 2371 in the second direction decreases in the first direction, thereby reducing the heat conduction capacity of the heat-conducting element 23. This reduces the temperature difference between the portion of the electrode assembly 22 near the tab 221 and the portion away from the tab 221. Furthermore, by adjusting the size of the seventh heat-conducting strip 2371 in the width direction in both directions, the change in the contact area of ​​the heat-conducting element 23 in the first direction can be made greater, thereby enhancing the ability of the heat-conducting element 23 to reduce the temperature difference between the portions of the electrode assembly 22.

[0128] In some embodiments, such as Figure 16 As shown, there are multiple electrode assemblies 22. By providing multiple electrode assemblies 22 within the battery cell 20, the voltage or current output by the battery cell 20 can be increased. Each electrode assembly 22 includes a portion facing other electrode assemblies 22 and a portion facing the inner wall of the receiving cavity 211. The heat generation of these two portions is also different. The following description, in conjunction with... Figure 4 Taking a battery cell 20 containing two electrode assemblies 22 as an example, the difference in heat generation between the two parts will be explained, such as... Figure 4As shown, during the charging process of the battery cell, the temperature of the upper center of the two electrode assemblies 22 is lower than the temperature of the upper center of the electrode assembly 22 near the inner wall of the receiving cavity 211; the temperature of the middle center of the two electrode assemblies 22 is lower than the temperature of the middle center of the electrode assembly 22 near the receiving cavity 211; the temperature of the lower part of the two electrode assemblies 22 is lower than the temperature of the lower part of the electrode assembly 22 near the receiving cavity 211. It can be seen that the heat generation of the part between the two electrode assemblies 22 is generally less than the heat generation of the part of the electrode assembly 22 near the receiving cavity 211. Therefore, the heat-conducting element 23 that contacts the two parts needs to be set with different heat conduction capabilities. For ease of explanation, the portion of the heat-conducting element 23 located between the inner wall of the receiving cavity 211 and the electrode assembly 22 is referred to as the first portion 231, and the portion located between adjacent electrode assemblies 22 is referred to as the second portion 232. The contact area between the first portion 231 and the electrode assembly 22 is larger than that between the second portion 232 and the electrode assembly 22, making the thermal conductivity of the first portion 231 greater than that of the second portion 232. This allows heat from the portion of the electrode assembly 22 near the inner wall of the receiving cavity 211 to be conducted more quickly to the portion between the two electrode assemblies 22, reducing the heat dissipation rate in the portion between the two electrode assemblies 22 and thus reducing the temperature difference between the portion of the electrode assembly 22 near the receiving cavity 211 and the portion between the two electrode assemblies 22. The first portion 231 and the second portion 232 can conduct heat to each other. The first portion 231 and the second portion 232 can be two parts of a single heat-conducting element 23, or they can be two separate heat-conducting elements 23 in contact. In the following embodiments, the structure of the first part 231 and the second part 232 is described in an exemplary manner. The first part 231 surrounds the outside of the two electrode assemblies 22 and is located between the electrode assembly 22 and the inner wall of the receiving cavity 211. The second part is located between the two electrode assemblies 22. The part of the electrode assembly 22 facing the inner wall of the receiving cavity 211 is referred to as the third part, and the part of the electrode assembly 22 between the two electrode assemblies 22 is referred to as the fourth part.

[0129] In some embodiments, combined with Figure 16 and Figure 17The surface of the first part 231 facing the electrode assembly 22 has a second groove 2311, and the surface of the second part facing the electrode assembly 22 has a third groove 2321. The distribution density of the second grooves 2311 is greater than that of the third grooves 2321. It can be understood that multiple second grooves 2311 are spaced apart on the surface of the first part, thereby forming an array of second grooves 2311 on the surface of the first part 231. Multiple third grooves 2321 are spaced apart on the surface of the second part 232, thereby forming an array of third grooves 2321 on the surface of the third grooves 2321. The density of the array of second grooves 2311 is greater than that of the array of third grooves 2321, thereby making the thermal conductivity of the first part 231 greater than that of the second part 232. This reduces the temperature difference between the third and fourth parts of the electrode assembly 22. Moreover, since the grooves do not need to penetrate the heat conductor 23, the thermal conductivity of each part of the heat conductor 23 can meet the requirements while giving the heat conductor 23 sufficient structural strength and a longer service life.

[0130] In some embodiments, combined with Figure 16 and Figure 18 The surface of the first part 231 facing the electrode assembly 22 has a second groove 2311, and the surface of the second part facing the electrode assembly 22 has a third groove 2321. The non-depth dimension of the second groove 2311 is smaller than the non-depth dimension of the third groove 2321. The non-depth dimension of the second groove 2311 is perpendicular to the depth direction of the second groove 2311, and the non-depth dimension of the third groove 2321 is perpendicular to the depth direction of the third groove 2321. It can be understood that the larger the non-depth dimensions of the second groove 2311 and the third groove 2321 are, the smaller the contact area between the heat-conducting element 23 and the electrode assembly 22 is. By making the non-depth dimension of the second groove 2311 smaller than the non-depth dimension of the third groove 2321, the contact area between the first part 231 and the electrode assembly 22 can be made larger than the contact area between the second part 232 and the electrode assembly 22, thereby making the heat conduction capacity of the first part 231 greater than that of the second part 232, thus reducing the temperature difference between the third and fourth parts of the electrode assembly 22.

[0131] In some embodiments, combined with Figure 16 and Figure 19The first part 231 has a second through hole 2312, and the second part 232 has a third through hole 2322. The distribution density of the second through holes 2312 is greater than the distribution density of the third through holes 2322. This can be understood as follows: multiple second through holes 2312 are spaced apart in the first part 231 to form an array of second through holes 2312, and multiple third through holes 2322 are spaced apart in the second part 232 to form an array of third through holes 2322. By making the through hole density of the array of second through holes 2312 greater than the through hole density of the array of third through holes 2322, the first... The contact area between part 231 and the third part of electrode assembly 22 is greater than the contact area between the second part 232 and the fourth part of electrode assembly 22, thereby reducing the temperature difference between the third and fourth parts of electrode assembly 22. Moreover, by setting a through-hole structure to reduce the contact area between heat conductor 23 and electrode assembly 22, it is not necessary to determine which face is used to contact electrode assembly 22 during the manufacturing process of heat conductor 23, making the manufacturing of heat conductor 23 more convenient. Furthermore, the third through-hole 2322 of the second part 232 of heat conductor 23 can be formed in one step.

[0132] In some embodiments, combined with Figure 16 and Figure 20 The first part 231 has a second through hole 2312 and the second part 232 has a third through hole 2322. The non-depth dimension of the second through hole 2312 is smaller than the non-depth dimension of the third through hole 2322. The non-depth dimension of the second through hole 2312 is perpendicular to the depth direction of the second through hole 2312, and the non-depth dimension of the third through hole 2322 is perpendicular to the depth direction of the third through hole 2322. It can be understood that the larger the non-depth dimension of the through hole, the greater the reduction in the contact area between the heat-conducting element 23 and the electrode assembly 22. By making the non-depth dimension of the second through hole 2312 larger than the non-depth dimension of the third through hole 2322, the contact area between the first part 231 and the third part of the electrode assembly 22 can be made larger than the contact area between the second part 232 and the fourth part of the electrode assembly 22, thereby reducing the temperature difference between the third part and the fourth part.

[0133] In some embodiments, combined with Figure 16 and Figure 21The first part 231 includes a third fixing part 23131 and a plurality of third heat-conducting strips 23132, each third heat-conducting strip 23132 being fixedly connected to the third fixing part 23131, and the third heat-conducting strips 23132 being spaced apart; the second part 232 includes a fourth fixing part 23231 and a plurality of fourth heat-conducting strips 23232, each fourth heat-conducting strip 23232 being fixedly connected to the fourth fixing part 23231, and the fourth heat-conducting strips 23232 being spaced apart; wherein, the spacing between adjacent third heat-conducting strips 23132 is... The spacing between the third heat-conducting strips 23132 and the fourth heat-conducting strips 23232 is smaller than that between the fourth heat-conducting strips 23232. This can be understood as multiple third heat-conducting strips 23132 being spaced apart to form a first heat-conducting array, and multiple fourth heat-conducting strips 23232 being spaced apart to form a second heat-conducting array. By making the density of the first heat-conducting array greater than that of the second heat-conducting array, the contact area between the first part 231 and the third part of the electrode assembly 22 can be greater than the contact area between the second part 232 and the fourth part of the electrode assembly 22, thereby reducing the temperature difference between the third and fourth parts. Moreover, by forming a hollow structure with multiple third heat-conducting strips 23132 and by forming a hollow structure with the fourth heat-conducting strips 23232, it is possible to reduce the contact area between the heat-conducting element 23 and the electrode assembly 22 without removing part of the heat-conducting element 23 after it is formed. That is, the contact area between the heat-conducting element 23 and the electrode assembly 22 is reduced through a non-subtractive method, thereby saving more manufacturing material for the heat-conducting element 23 and further reducing the manufacturing cost of the heat-conducting element 23.

[0134] In some embodiments, combined with Figure 16 and Figure 22 The first part 231 includes a fifth fixing part 23141 and a plurality of fifth heat-conducting strips 23142, which are fixedly connected to the fifth fixing part 23141 and are spaced apart. The second part 232 includes a sixth fixing part 23241 and a plurality of sixth heat-conducting strips 23242, which are fixedly connected to the sixth fixing part 23241 and are spaced apart. The width dimension of the fifth heat-conducting strip 23142 is greater than the width dimension of the sixth heat-conducting strip 23242. The width direction of the fifth heat-conducting strip 23142 is perpendicular to the extension direction of the fifth heat-conducting strip 23142, and the width direction of the sixth heat-conducting strip 23242 is perpendicular to the extension direction of the sixth heat-conducting strip 23242. That is, by making the width direction dimension of the fifth heat-conducting strip 23142 larger than the width direction dimension of the sixth heat-conducting strip 23242, the contact area between the first part 231 and the third part of the electrode assembly 22 can be made larger than the contact area between the second part 232 and the fourth part of the electrode assembly 22, thereby reducing the temperature difference between the third part and the fourth part.

[0135] In some embodiments, combined with Figure 16 and Figure 23 The first part 231 includes multiple eighth heat-conducting strips 23151, which are arranged in an alternating pattern to form a second mesh structure 23152. The second part 232 includes ninth heat-conducting strips 23251, which are arranged in an alternating pattern to form a third mesh structure 23252. The mesh density of the second mesh structure 23152 is greater than that of the third mesh structure 23252. The greater the mesh density of the mesh structure, the larger the contact area between the mesh structure and the electrode assembly 22. This is achieved by making the mesh density of the second mesh structure 23152 greater than that of the third mesh structure. The mesh density of structure 23252 makes the contact area between the first part 231 and the third part of the electrode assembly 22 greater than the contact area between the second part 232 and the fourth part of the electrode assembly 22, thereby reducing the temperature difference between the third and fourth parts of the electrode assembly 22. Furthermore, by forming a second mesh structure 23152 through multiple interlaced and mutually fixed eighth heat-conducting strips 23151, and a third mesh structure 23252 through interlaced and mutually fixed ninth heat-conducting strips 23251, the number of fixing points for each heat-conducting strip is increased, thereby improving the structural strength of the heat-conducting component 23. The following section combines... Figure 23 and Figure 24 The method for achieving a mesh density greater than that of the third mesh structure 23252 is explained.

[0136] like Figure 23 As shown, the spacing between adjacent eighth heat-conducting strips 23151 is smaller than the spacing between adjacent ninth heat-conducting strips 23251. That is, by controlling the spacing of the eighth and ninth heat-conducting strips 23151, the second mesh structure 23152 forms a denser mesh structure, and the third mesh structure 23252 forms a sparser mesh structure. This results in the mesh density of the second mesh structure 23152 being greater than that of the third mesh structure 23252. Consequently, the contact area between the first part 231 and the third part of the electrode assembly 22 is greater than the contact area between the second part 232 and the fourth part of the electrode assembly 22. This reduces the temperature difference between the third and fourth parts of the electrode assembly 22. Furthermore, by controlling the spacing of each heat-conducting strip and the mesh density of the mesh structure, the width of each heat-conducting strip can be made the same, reducing the manufacturing difficulty of the heat-conducting strips.

[0137] like Figure 24As shown, the width dimension of the eighth heat-conducting strip 23151 is greater than the width dimension of the ninth heat-conducting strip 23251. The width direction of the eighth heat-conducting strip 23151 is perpendicular to the extension direction of the eighth heat-conducting strip 23151, and the width direction of the ninth heat-conducting strip 23251 is perpendicular to the extension direction of the ninth heat-conducting strip 23251. By adjusting the width dimension of each heat-conducting strip, the contact area between the first part 231 and the third part of the electrode assembly 22 is made greater than the contact area between the second part 232 and the fourth part of the electrode assembly 22, thereby reducing the temperature difference between the third and fourth parts of the electrode assembly 22. Moreover, by controlling the mesh density of the mesh structure by adjusting the width dimension of the heat-conducting strip, it is not necessary to accurately control the spacing of each heat-conducting strip, thereby reducing the assembly difficulty of each heat-conducting strip.

[0138] According to some embodiments of this application, this application also provides a battery. The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0139] In some embodiments, such as Figure 2 As shown, the battery device 100 includes a housing 10 and at least one such as Figures 5 to 24 The battery cell 20 shown in any one of the pictures has a housing space inside the box 100, and each battery cell 20 is located in the housing space.

[0140] According to some embodiments of this application, this application also provides an electrical device including a battery as described in any of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0141] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A battery cell, characterized in that, The battery cell includes: The shell has an internal cavity; An electrode assembly is located within the receiving cavity, and the electrode assembly has tabs; A heat-conducting component is located between the inner wall of the receiving cavity and the electrode assembly and is in contact with the electrode assembly; Specifically, the contact area between the heat-conducting element and the electrode assembly decreases in the direction from the tab to the distance from the tab.

2. The battery cell according to claim 1, characterized in that, The number of electrode assemblies is multiple, and each electrode assembly is located within the receiving cavity; The heat-conducting component includes a first part and a second part that can conduct heat between each other. The first part is located between the inner wall of the receiving cavity and the electrode assembly, and the second part is located between adjacent electrode assemblies. The contact area between the first part and the electrode assembly is greater than the contact area between the second part and the electrode assembly.

3. The battery cell according to claim 1 or 2, characterized in that, The heat-conducting element has a plurality of first grooves on the surface facing the electrode assembly. The distribution density of the first grooves increases along the direction from near the electrode tab to away from the electrode tab, and / or the non-depth dimension of the first grooves increases, wherein the non-depth dimension is the dimension perpendicular to the depth direction of the first groove.

4. The battery cell according to claim 2, characterized in that, The first portion has a second groove on the surface facing the electrode assembly, and the second portion has a third groove on the surface facing the electrode assembly. The distribution density of the second groove is greater than the distribution density of the third groove, and / or, the non-depth dimension of the second groove is smaller than the non-depth dimension of the third groove. The non-depth dimension of the second groove is a dimension perpendicular to the depth direction of the second groove, and the non-depth dimension of the third groove is a dimension perpendicular to the depth direction of the third groove.

5. The battery cell according to claim 1 or 2, characterized in that, The heat-conducting component has a plurality of first through holes, the distribution density of the first through holes increases along the direction from near the tab to away from the tab, and / or the non-depth dimension of the first through holes increases, the non-depth dimension being the dimension perpendicular to the depth direction of the first through holes.

6. The battery cell according to claim 2, characterized in that, The first part has a second through hole, the second part has a third through hole, the distribution density of the second through hole is greater than the distribution density of the third through hole, and / or, the non-depth dimension of the second through hole is smaller than the non-depth dimension of the third through hole, the non-depth dimension of the second through hole is a dimension perpendicular to the depth direction of the second through hole, and the non-depth dimension of the third through hole is a dimension perpendicular to the depth direction of the third through hole.

7. The battery cell according to claim 1 or 2, characterized in that, The heat-conducting component includes a first fixing part and a plurality of first heat-conducting strips. Each of the first heat-conducting strips is fixedly connected to the first fixing part, and the first heat-conducting strips are spaced apart. Along the direction from near the electrode tab to away from the electrode tab, the spacing between adjacent first heat-conducting strips increases.

8. The battery cell according to claim 7, characterized in that, The extension direction of the first fixing part is parallel to the first direction, and the two ends of each of the first heat-conducting strips are respectively fixed to the first fixing part; Each of the first heat-conducting strips extends along the second direction, and each of the first heat-conducting strips is spaced apart along the first direction, with the spacing between adjacent first heat-conducting strips increasing. Wherein, the first direction is from the direction close to the electrode to the direction away from the electrode, and the second direction is perpendicular to the first direction.

9. The battery cell according to claim 7, characterized in that, The number of the first fixing parts is at least three, and each of the first fixing parts is spaced apart in the first direction and extends along the second direction to form a plurality of heat-conducting areas in the first direction; The ends of the plurality of first heat-conducting strips are respectively fixed to adjacent first fixing parts, and in each heat-conducting area, each first heat-conducting strip is spaced apart along the second direction, and the spacing between adjacent first heat-conducting strips in each heat-conducting area in the first direction decreases. Wherein, the first direction is from the direction close to the electrode to the direction away from the electrode, and the second direction is perpendicular to the first direction.

10. The battery cell according to claim 1 or 2, characterized in that, The heat-conducting component includes a second fixing part and a plurality of second heat-conducting strips. Each of the second heat-conducting strips is fixedly connected to the second fixing part. Along the direction from near the electrode tab to away from the electrode tab, the width dimension of each of the second heat-conducting strips decreases. The width direction is perpendicular to the extension direction of the second heat-conducting strip.

11. The battery cell according to claim 2, characterized in that, The first part includes a third fixing part and a plurality of third heat-conducting strips, each of the third heat-conducting strips being fixedly connected to the third fixing part, and the third heat-conducting strips being spaced apart; The second part includes a fourth fixing part and a plurality of fourth heat-conducting strips, each of the fourth heat-conducting strips being fixedly connected to the fourth fixing part, and the fourth heat-conducting strips being spaced apart; The spacing between adjacent third heat-conducting strips is smaller than the spacing between adjacent fourth heat-conducting strips.

12. The battery cell according to claim 2, characterized in that, The first part includes a fifth fixing part and a plurality of fifth heat-conducting strips, each of the fifth heat-conducting strips being fixedly connected to the fifth fixing part, and the fifth heat-conducting strips being spaced apart; The second part includes a sixth fixing part and a plurality of sixth heat-conducting strips, each of the sixth heat-conducting strips being fixedly connected to the sixth fixing part, and the sixth heat-conducting strips being spaced apart; The width of the fifth heat-conducting strip is greater than the width of the sixth heat-conducting strip. The width of the fifth heat-conducting strip is perpendicular to its extension direction, and the width of the sixth heat-conducting strip is perpendicular to its extension direction.

13. The battery cell according to claim 1 or 2, characterized in that, The heat-conducting component includes a plurality of seventh heat-conducting strips, and the seventh heat-conducting strips are arranged in an alternating manner to form a first mesh structure; The mesh density of the first mesh structure decreases in the direction from the electrode to the distance from the electrode.

14. The battery cell according to claim 13, characterized in that, The spacing between adjacent seventh heat-conducting strips increases in the direction from the electrode tab towards the electrode tab. And / or, The width dimension of the seventh heat-conducting strip decreases in the direction from the tab to the distance from the tab, and the width direction is perpendicular to the extension direction of each seventh heat-conducting strip.

15. The battery cell according to claim 2, characterized in that, The first part includes a plurality of eighth heat-conducting strips, which are arranged in an alternating manner to form a second mesh structure; the second part includes a plurality of ninth heat-conducting strips, which are arranged in an alternating manner to form a third mesh structure. The mesh density of the second mesh structure is less than that of the third mesh structure.

16. The battery cell according to claim 15, characterized in that, The spacing between adjacent eighth heat-conducting strips is smaller than the spacing between adjacent ninth heat-conducting strips. And / or, The width of the eighth heat-conducting strip is greater than that of the ninth heat-conducting strip. The width of the eighth heat-conducting strip is perpendicular to its extension direction, and the width of the ninth heat-conducting strip is perpendicular to its extension direction.

17. The battery cell according to claim 2, characterized in that, The first part and the second part are two separate parts, and the first part and the second part are in contact; or, The first part and the second part are connected.

18. A battery device, characterized in that, The battery device includes: The container has internal storage space; At least one battery cell as described in any one of claims 1 to 17, each of the battery cells being located within the accommodating space.

19. An electrical appliance, characterized in that, The electrical device includes the battery device as described in claim 18, the battery device being used to provide electrical energy.

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