Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and relates to the technical field of batteries, according to the battery monomer provided by the invention, a conductive coating is arranged on one side, deviating from an end cover, of an adapter piece along a first direction, and the conductive coating at least covers a first welding area formed by welding the adapter piece and an electrode terminal. The thickness of the switching piece can be increased through the conductive coating in the first welding area, the overcurrent conductivity is improved, the switching piece and the conductive coating meet the overcurrent requirement, the current resistance and the internal resistance are reduced, meanwhile, the thickness of the switching piece in the first welding area can be properly reduced through the arrangement of the conductive coating, the welding energy is reduced, and the welding efficiency is improved. And at least the first welding area is provided with the conductive coating, so that welding slag can be fixed through the conductive coating, and particles are prevented from scattering into the battery monomer to cause potential safety hazards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery and a power utilization device. BACKGROUND

[0002] In the battery monomer structure, the adapter plate serves as a bridge connecting the internal circuit and the external circuit, and the design of the adapter plate is closely related to the performance of the battery monomer. Generally, the length and width dimensions of the adapter plate are related to the thickness of the battery monomer and the position of the tab. At the same time, in order to improve the performance of the battery monomer, the thicker the thickness of the adapter plate is, the better the performance of the battery monomer is. The thicker the thickness of the adapter plate is, the larger the cross section is, and the smoother the circuit is. With the advent of the fast charging era of batteries, the demand for fast charging of the battery monomer is getting higher and higher. Therefore, under the limitation of the size of the battery monomer, the thickness of the adapter plate is increased to ensure the overcurrent demand of fast charging. However, with the increase of the thickness of the adapter plate, the energy required for welding the adapter plate and the electrode terminal and the tab will inevitably cause vibration and high temperature, thereby damaging the tab and burning other components.

[0003] In the related art, the position of the adapter plate and the electrode terminal and the tab is thinned. However, local thinning still has the phenomenon of excessive local heating, and also occupies most of the height space and reduces the energy density, affecting the performance of the battery. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to provide a battery monomer, a battery and a power utilization device to solve the technical problem of the influence of the adapter plate on the charging and discharging performance of the battery monomer in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0006] In one aspect, the present application provides a battery monomer, comprising: an end cover, a tab, an electrode terminal, an adapter plate and a conductive coating, the adapter plate connecting the tab and the electrode terminal, wherein the side of the adapter plate away from the end cover has a first welding area formed by welding the adapter plate and the electrode terminal; the conductive coating is arranged on the side of the adapter plate away from the end cover along the first direction, and the conductive coating covers at least the first welding area.

[0007] In one or more embodiments of the present application, the area of the orthographic projection of the conductive coating on the projection plane is consistent with the area of the orthographic projection of the side of the adapter plate away from the end cover on the projection plane, and the projection plane and the first direction are perpendicular to each other.

[0008] In one or more embodiments of the present application, the tab has a second welding area formed by welding the tab and the adapter piece; the second welding area and the first welding area are located on two sides of the adapter piece along the first direction; the side of the adapter piece facing away from the end cover has a first area corresponding to the position of the second welding area; the conductive coating covers at least the first area.

[0009] Alternatively, the second welding area and the first welding area are located on the same side of the adapter piece; the conductive coating covers at least the second welding area.

[0010] In one or more embodiments of the present application, the side of the adapter piece facing away from the end cover is recessed to form a first recess, and the first welding area is formed at the bottom of the first recess; the conductive coating has a first thickening part at a position corresponding to the first recess, the first thickening part covers the first welding area, and at least part of the first thickening part fills the first recess.

[0011] In one or more embodiments of the present application, the adapter piece includes a second thinning part and an un-thinned part, the thickness of the second thinning part is less than the thickness of the un-thinned part, and the second thinning part is welded with the tab.

[0012] In one or more embodiments of the present application, the coating density of the conductive coating is 1g-3g / mm 3 , and / or,

[0013] The conductivity of the conductive coating is 10 -7 -10 -2 S / m, and / or,

[0014] The thickness of the conductive coating is 0.2-1mm.

[0015] In one or more embodiments of the present application, the thickness of the adapter piece at the first recess is h1, the thickness of the second thinning part is h2, and the thickness of the un-thinned part is H, 1 / 10H≤h1≤2 / 3H, 1 / 10H≤h2≤2 / 3H; and / or, 0.2mm≤h1≤0.8mm, 0.2mm≤h2≤0.8mm, 0.3mm≤H≤1.5mm.

[0016] In one or more embodiments of the present application, further comprising:

[0017] An insulating member is arranged between the end cover and the adapter piece, both ends of the insulating member along the second direction are provided with a turnover plate, and the side of the turnover plate facing the adapter piece is provided with a cavity for accommodating the conductive coating.

[0018] In a second aspect, the present application also provides a battery cell as claimed in any one of the first aspect.

[0019] In a third aspect, the present application also provides a power device comprising the battery as claimed in the second aspect.

[0020] Based on the above technical solutions, the battery monomer, the battery and the power utilization device provided by the application have at least the following beneficial technical effects:

[0021] The battery monomer provided by the application can increase the thickness of the adapter piece as a whole through the conductive coating, increase the overcurrent conduction capacity, make the adapter piece and the conductive coating meet the overcurrent requirement, reduce the current resistance and the internal resistance, and appropriately thin the thickness of the adapter piece at the first welding area through the conductive coating to reduce the welding energy. The conductive coating covering the first welding area can also fix the welding slag through the conductive coating to prevent the particles from scattering into the battery monomer and causing a safety hazard. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the battery monomer of the application.

[0024] Figure 2 is a schematic diagram of the exploded structure of the battery monomer of the application.

[0025] Figure 3 is a schematic diagram of the structure of the battery monomer of another embodiment of the application.

[0026] Figure 4 is a schematic diagram of the exploded structure of the battery monomer of another embodiment of the application.

[0027] Figure 5 is a schematic diagram of the exploded structure of the battery monomer of another embodiment of the application.

[0028] Figure 6 is a schematic diagram of the structure of the adapter piece of the application.

[0029] Figure 7 is a schematic diagram of the top view of the adapter piece of the application.

[0030] Figure 8 is Figure 7 A-A sectional view in

[0031] In the figure: 1-electrode assembly; 2-conductive coating; 3-adapter piece; 4-tab; 5-electrode terminal; 6-end cover; 7-insulating piece; 21-first thickening; 22-second thickening; 23-main body; 31-first groove; 32-second thinning; 33-unthinned part; 41-second welding area; 51-first welding area; 71-inverted plate; 72-cavity. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only intended to explain the present application and not to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] In the related art, in order to meet the overcurrent requirement of fast charging of the battery, the thickness of the adapter piece is usually thickened, and the thickening of the adapter piece causes not a small trouble in manufacturing. The thicker the adapter piece, the greater the energy of the welding of the adapter piece and the electrode terminal and the tab, and the increase in the required welding energy will inevitably cause vibration and high temperature, thereby damaging the tab and burning other components. Therefore, in the related art, the position of the welding of the adapter piece and the electrode terminal and the tab is usually thinned, but the local thinning still has the phenomenon of excessive local heating, and at the same time occupies most of the height space and reduces the energy density, affecting the performance of the battery.

[0037] Based on the above considerations, in order to solve the technical problem that the adapter sheet affects the charging and discharging performance of the battery monomer in the prior art, the application provides a battery monomer, which comprises an end cover, a tab, an electrode terminal, an adapter sheet and a conductive coating, the adapter sheet connects the tab and the electrode terminal, wherein the side of the adapter sheet away from the end cover has a first welding area, the first welding area is formed by welding the adapter sheet and the electrode terminal; the conductive coating is arranged on the side of the adapter sheet away from the end cover in the first direction, and the conductive coating at least covers the first welding area.

[0038] In the technical scheme of the embodiments of the application, the conductive coating is arranged on the side of the adapter sheet away from the end cover in the first direction, and the conductive coating at least covers the first welding area formed by welding the adapter sheet and the electrode terminal. Then the thickness of the adapter sheet as a whole can be increased by the conductive coating, the overcurrent conduction capacity is increased, the adapter sheet and the conductive coating meet the overcurrent demand, the current resistance and internal resistance are reduced, and meanwhile the thickness of the adapter sheet at the first welding area is appropriately thinned by the arrangement of the conductive coating, so as to reduce the welding energy, and the conductive coating covering the first welding area can also fix the welding slag through the conductive coating, so as to prevent the particles from scattering into the battery monomer and causing a safety hazard.

[0039] The battery monomer of the application is suitable for a power consumption device using a battery as a power source or a variety of energy storage systems using a battery as an energy storage element.

[0040] The technical scheme of the application will be described in detail below with reference to the accompanying drawings.

[0041] Please refer to Figure 1 and Figure 2 The embodiments of the application provide a battery monomer, which comprises an end cover 6, a tab 4, an electrode terminal 5, an adapter sheet 3 and a conductive coating 2; the adapter sheet 3 connects the tab 4 and the electrode terminal 5, wherein the side of the adapter sheet 3 away from the end cover 6 has a first welding area 51, the first welding area 51 is formed by welding the adapter sheet 3 and the electrode terminal 5; the conductive coating 2 is arranged on the side of the adapter sheet 3 away from the end cover 6 in the first direction X, and the conductive coating 2 at least covers the first welding area 51.

[0042] The end cover 6 is a structural member for closing the opening of the shell to seal the electrode assembly 1 in the shell in cooperation with the shell of the battery monomer. The electrode terminal 5 is arranged on the end cover 6. The adapter sheet 3 is a structural member for connecting the tab 4 of the electrode assembly 1 and the electrode terminal 5 on the end cover 6 to lead out the current of the electrode assembly 1. The first welding area 51 can be understood as the welding area of the adapter sheet 3 and the electrode terminal 5. The conductive coating 2 is coated on the adapter sheet 3 on the side away from the end cover 6 and at least covers the first welding area 51. The conductive coating 2 is coated by a material with a certain conductivity. The first direction X can be the thickness direction of the end cover 6.

[0043] In the technical scheme of the embodiment of the present application, the conductive coating 2 is arranged on the side of the adapter piece 3 away from the end cover 6 along the first direction X, and the conductive coating 2 covers at least the first welding area 51 formed by welding the adapter piece 3 and the electrode terminal 5. The thickness of the adapter piece 3 can be increased at the first welding area 51 by the conductive coating 2, the overcurrent conduction capacity is increased, the adapter piece 3 and the conductive coating 2 can meet the overcurrent requirement, the current resistance and internal resistance can be reduced, and the thickness of the adapter piece 3 at the first welding area 51 can be appropriately reduced by arranging the conductive coating 2, so as to reduce the welding energy. The welding slag is fixed by the conductive coating 2, and the particles are prevented from scattering into the battery monomer, thereby avoiding safety hazards.

[0044] The conductive coating of the embodiment of the present application includes a conductive polymer, and the material of the conductive coating includes one or more of polypyrrole, polyphenylacetylene, polyphenylene sulfide, polythiophene, polyfuran, polyaniline, polycarboxylic acid, derivatives of polypyrrole, derivatives of polyphenylacetylene, derivatives of polyphenylene sulfide, derivatives of polythiophene, derivatives of polyfuran, derivatives of polyaniline, and derivatives of polycarboxylic acid.

[0045] Further, in order to reduce the welding difficulty of the adapter piece 3 and the electrode terminal 5 while ensuring the conduction capacity of the adapter piece 3, please refer to Figure 4 and Figure 5 In some embodiments, the side of the adapter piece 3 away from the end cover 6 is recessed to form a first recess 31, and the first welding area 51 is formed at the bottom of the first recess 31; the conductive coating 2 has a first thickening portion 21 at a position corresponding to the first recess 31, the first thickening portion 21 covers the first welding area 51, and at least part of the first thickening portion 21 is filled in the first recess 31.

[0046] It can be understood that the adapter piece 3 forms a first thinning portion at the first recess 31. The adapter piece 3 and the electrode terminal 5 are welded at the bottom of the first recess 31 and form the first welding area 51, and the first welding area 51 is located in the first recess 31. The area of the first thickening portion 21 covers the first welding area 51, and the first thickening portion 21 can be partially or completely filled in the first recess 31, or even the first thickening portion 21 can be arranged protruding from the adapter piece 3.

[0047] In the technical solution of this application embodiment, by removing part of the material from the side of the adapter piece 3 away from the end cap 6 to form a first groove 31, that is, the thickness of the adapter piece 3 is reduced at the first groove 31 to form a first thinned portion. Thus, when welding the first thinned portion and the electrode terminal 5, the required penetration thickness is reduced, thereby reducing the welding energy and the heat generated by welding, avoiding damage to the electrode tab and burning of other components. At the same time, a first thickened portion 21 is provided in the conductive coating 2, which partially or completely fills the first groove 31, which can increase conductivity, reduce resistance and DCR internal resistance, and the conductive coating 2 covering the first welding area 51 can fix the welding slag and prevent particles from falling off.

[0048] Furthermore, in order to reduce the welding difficulty of the adapter piece 3 and the electrode terminal 5 while minimizing the impact on the overcurrent conductivity of the adapter piece 3, the thickness of the adapter piece 3 at the first groove 31 is h1, 0.2mm≤h1≤0.8mm.

[0049] Specifically, the value of h1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm.

[0050] Specifically, in this embodiment, the adapter piece 3 includes a first thinned portion and an unthinned portion 33. The thickness of the adapter piece 3 at the first groove 31 and the thickness H of the unthinned portion 33 are related, that is, 1 / 10H≤h1≤2 / 3H, 0.3mm≤H≤1.5mm.

[0051] Specifically, the relationship between h1 and H can also be 1 / 8H≤h1≤1 / 3H, or 1 / 6H≤h1≤1 / 3H. The value of H can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.9mm, 1.2mm, 1.4mm, or 1.5mm.

[0052] For example, since the thickness H of the unthinned portion 33 and the thickness h1 of the adapter piece 3 at the first groove 31 are related, when the thickness H of the unthinned portion 33 is 1.5mm, the thickness h1 of the adapter piece 3 at the first groove 31 needs to satisfy 0.15mm≤h1≤1mm and 0.2mm≤h1≤0.8mm. Therefore, the thickness h1 of the adapter piece 3 at the first groove 31 can be 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm, or 0.75mm.

[0053] In some embodiments, considering that while high-density conductive coating 2 has good conductivity, it affects the flexibility of the conductive coating, and while low-density conductive coating 2 has good flexibility, it has poor conductivity, the coating density of conductive coating 2 is designed to be 1 g / mm².3 ~3g / mm 3 , so as to ensure the flexibility of the conductive coating 2, i.e. not easy to dry crack; specifically, the coating density of the conductive coating 2 can be 1 g / mm 3 or 1.5 g / mm 3 or 1.8 g / mm 3 or 2.2 g / mm 3 or 2.5 g / mm 3 or 2.8 g / mm 3 or 3 g / mm 3 .

[0054] In some embodiments, considering that the higher the conductivity of the conductive coating 2 is, the stronger the conductivity is, and the thicker the thickness of the conductive coating 2 is, the higher the resistance is, therefore, the conductivity of the conductive coating 2 is designed to be 10 -7 S / m~10 -2 S / m, and the thickness of the conductive coating 2 is 0.2 mm~1 mm, so as to ensure the mechanical property of the conductive coating 2 while ensuring the conductivity thereof.

[0055] Specifically, the conductivity of the conductive coating 2 can be 10 -7 S / m or 10 -6 S / m or 10 -5 S / m or 10 -4 S / m or 10 -3 S / m or 10 -2 S / m. The thickness of the conductive coating 2 can be 0.2 mm or 0.4 mm or 0.6 mm or 0.8 mm or 1 mm.

[0056] In some embodiments, the tab 4 has a second welding area 41, which is formed by welding the tab 4 and the adapter piece 3; the second welding area 41 and the first welding area 51 are respectively located on two sides of the adapter piece 3 along the first direction X; the side of the adapter piece 3 away from the end cover 6 has a first area, the position of the first area corresponds to the position of the second welding area 41; the conductive coating 2 at least covers the first area.

[0057] Wherein, the second welding area 41 can be understood as the area formed by welding the tab 4 and the adapter piece 3. The second welding area 41 and the first welding area 51 are respectively located on two sides of the adapter piece 3 along the first direction X can be understood as the part of the tab 4 connected with the adapter piece 3 is located between the adapter piece 3 and the end cover 6. The first area is arranged on the side away from the end cover 6 corresponding to the second welding area 41, and the area of the first area can be consistent with the area of the second welding area 41, or can be larger than the area of the second welding area 41.

[0058] In the technical scheme of the embodiment of the present application, through the above setting, on the basis of the conductive coating 2 coated on the first welding area 51, the conductive coating 2 is also coated on the first area corresponding to the second welding area 41. The conductive coating 2 can make the thickness of the adapter tab 3 at the second welding area 41 be appropriately thinned, that is, provide a basis for reducing the thickness of the part of the adapter tab welded with the tab 4, which helps to reduce the welding difficulty of the tab 4 and the adapter tab 3 while ensuring the overcurrent conduction capability.

[0059] Further, the side of the adapter tab 3 facing the end cover 6 is recessed to remove part of the material to form a second groove, so that the adapter tab 3 forms a second thinned portion 32 at the second groove. The thickness of the second thinned portion 32 is less than the thickness of the non-thinned portion 33. The second thinned portion 32 is welded with the tab 4. In this way, the welding quality is ensured while the energy required for welding the tab 4 and the second thinned portion 32 is reduced, that is, the heat generated when the tab 4 and the second thinned portion 32 are welded is reduced, thereby reducing the risk of damage to the tab 4.

[0060] Specifically in the embodiment, considering that reducing the welding difficulty of the adapter tab 3 and the electrode terminal 5 can also reduce the welding difficulty of the tab 4 and the adapter tab 3, therefore, the first groove 31 can be formed on the side of the adapter tab 3 away from the end cover 6, and the second groove can be formed on the side of the adapter tab 3 facing the end cover 6, that is, the adapter tab 3 includes the first thinned portion formed at the first groove 31, the second thinned portion formed at the second groove, and the non-thinned portion 33 connecting the first thinned portion and the second thinned portion. In this way, the welding difficulty of the adapter tab 3 and the electrode terminal 5 and the tab 4 and the adapter tab 3 is solved by locally removing the material of the adapter tab 3, and the overcurrent conduction capability of the adapter tab 3 is ensured by the conductive coating 2 covering the first welding area 51 and the first area.

[0061] It should be noted that the conductive coating 2 can only have the first thickened portion 21 for covering the first welding area 51 and capable of filling the first groove 31, and a coating portion for covering the first area. Of course, the conductive coating 2 can also have the first thickened portion 21 for covering the first welding area 51 and capable of filling the first groove 31, and a coating portion for covering all areas of the adapter tab 3 except the first groove 31.

[0062] In another embodiment, please refer to Figure 2 The tab 4 has a second welding area 41 formed by welding the tab 4 and the adapter tab 3. The second welding area 41 and the first welding area 51 are located on the same side of the adapter tab 3. The conductive coating 2 at least covers the second welding area 41.

[0063] It can be understood that the second welding area 41 is located on the side of the adapter piece 3 away from the end cover 6, and the first welding area 51 is located on the same side of the adapter piece 3.

[0064] In this embodiment, the conductive coating 2 covers at least the second welding area 41, which makes it possible to appropriately thin the thickness of the adapter piece 3 at the second welding area 41, and also enables the conductive coating 2 to cover the second welding area 41, fix the welding slag, and prevent particles from falling into the interior of the battery monomer and causing a safety hazard.

[0065] Further, referring to Figure 4 , the side of the adapter piece 3 away from the end cover 6 is recessed to remove material to form a third recess, and thus the adapter piece 3 forms a second thinned portion 32 at the third recess, the thickness of the second thinned portion 32 is less than the thickness of an unthinned portion 33, the second thinned portion 32 is welded to the tab 4; the conductive coating 2 has a second thickened portion 22 at a position corresponding to the third recess, the second thickened portion 22 covers the second welding area 41, and part or all of the second thickened portion 22 is filled in the second recess.

[0066] In this embodiment, on the one hand, by forming the second thinned portion 32, the welding quality is ensured while the energy required for welding the tab 4 and the second thinned portion 32 is reduced, that is, the heat generated when the tab 4 and the second thinned portion 32 are welded is reduced, and thus the risk of damage to the tab 4 is reduced; on the other hand, by providing the second thickened portion 22, the overcurrent conduction capability of the adapter piece 3 is ensured, and the second thickened portion 22 covering the second welding area 41 can fix the welding slag and prevent particles from falling.

[0067] In particular to this embodiment, referring to Figure 4 , considering that reducing the welding difficulty of the adapter piece 3 and the electrode terminal 5 can also reduce the welding difficulty of the tab 4 and the adapter piece 3, and can also fix the welding slag, therefore, the first recess 31 can be formed on the side of the adapter piece 3 away from the end cover 6 at the same time that the third recess is formed on the side of the adapter piece 3 away from the end cover 6, that is, the adapter piece 3 includes a first thinned portion at the first recess 31, a second thinned portion 32 at the third recess, and an unthinned portion 33 connecting the first thinned portion and the second thinned portion 32, in this way, the welding difficulty of the adapter piece 3 and the electrode terminal 5 and the tab 4 and the adapter piece 3 is solved by locally removing material from the adapter piece 3, and the overcurrent conduction capability of the adapter piece 3 is ensured while the welding slag is fixed by the conductive coating 2 covering the first welding area 51 and the second welding area 41, which avoids the welding slag from falling and affecting the safety performance of the battery.

[0068] It should be noted that the conductive coating 2 can only include the first thickened portion 21 and the second thickened portion 22. Of course, it can also be, referring to Figure 5The conductive coating 2 includes a main body part 23, a first thickened part 21 and a second thickened part 22. The main body part 23 connects the first thickened part 21 and the second thickened part 22. The first thickened part 21 covers the first welding area 51, and part of the first thickened part 21 is accommodated in the first groove 31. The second thickened part 22 covers the second welding area 41, and part of the second thickened part 22 is accommodated in the third groove. The main body part 23 covers all areas of the adapter tab 3 except the first groove and the third groove.

[0069] In some optional embodiments, considering that the second thinned part 32 is too thin and has the risk of welding through, and the second thinned part 32 is too thick and is not conducive to reducing the risk of damage to the tab 4 caused by welding heat, therefore, the thickness h2 of the second thinned part 32 is designed to be 0.2mm≤h2≤0.8mm, so that the design not only ensures the structural strength of the second thinned part 32, but also ensures the difficulty of welding.

[0070] Specifically, the thickness h2 of the second thinned part 32 can be 0.2mm or 0.34mm or 0.46mm or 0.57mm or 0.64mm or 0.78mm or 0.8mm.

[0071] Specific to the present embodiment, the adapter tab 3 includes the second thinned part 32 and the non-thinned part 33. The thickness h2 of the second thinned part 32 and the thickness H of the non-thinned part 33 are related, and satisfy 1 / 10H≤h2≤2 / 3H, 0.3mm≤H≤1.5mm.

[0072] For example, since the thickness h2 of the second thinned part 32 and the thickness H of the non-thinned part 33 are related, when the thickness H of the non-thinned part 33 is 1.2mm, the thickness h2 of the second thinned part 32 needs to satisfy 0.12mm≤h2≤0.8mm, and also needs to satisfy 0.2mm≤h2≤0.8mm, therefore, the thickness h2 of the second thinned part 32 can be 0.22mm or 0.37mm or 0.46mm or 0.58mm or 0.69mm or 0.79mm.

[0073] In some optional embodiments, considering that the difficulty of welding the adapter tab 3 and the electrode terminal 5 is reduced, and the difficulty of welding the tab 4 and the adapter tab 3 is also reduced, the adapter tab 3 can be thinned as a whole, that is, in addition to the first thinned part and the second thinned part 32 obtained by thinning the adapter tab 3, the remaining part of the adapter tab 3 is also thinned, so that the thickness of the first thinned part and / or the thickness of the second thinned part 32 is equal to the thickness of the part of the adapter tab 3 except the first thinned part and the second thinned part 32, that is, the thickness of the adapter tab 3 as a whole is thinned, specifically, the thickness of the adapter tab 3 as a whole is between 0.2mm and 0.8mm; while the adapter tab 3 is thinned, the overcurrent conducting capacity of the adapter tab can also be ensured. Please refer toFigures 1 to 4 The normal projection area of the conductive coating 2 on the projection plane is consistent with the normal projection area of the side of the adapter piece 3 away from the end cover 6 on the projection plane, and the projection plane and the first direction X are perpendicular to each other.

[0074] It can be understood that when the first welding area 51 and the second welding area 41 are located on both sides of the adapter piece 3, the conductive coating 2 covers the entire area of the adapter piece 3; and when the first welding area 51 and the second welding area 41 are located on the same side of the adapter piece 3, the conductive coating 2 covers the second welding area 41 and the first welding area 51, and also covers the entire area of the adapter piece 3 except the non-welding area of the tab 4.

[0075] In this embodiment, the overall thickness of the adapter piece 3 is appropriately thinned to meet the needs of battery cell miniaturization and light weight, reduce the welding energy when the adapter piece 3 is welded with the electrode terminal 5 and the tab 4, and at the same time, the overall thickness of the adapter piece 3 is increased due to the conductive coating 2 coated on the surface of the adapter piece 3, which ensures the overcurrent conduction capability, so that the adapter piece 3 and the conductive coating 2 meet the overcurrent requirement, reduce the resistance and internal resistance, and improve the circuit conduction performance of the battery cell.

[0076] Please refer to Figure 4 In some embodiments, the battery cell further comprises: an insulating piece 7 arranged between the end cover 6 and the adapter piece 3, both ends of the insulating piece 7 along the second direction Y are provided with a turnover plate 71, and the side of the turnover plate 71 facing the adapter piece 3 is provided with a cavity 72 for accommodating the conductive coating 2. The second direction Y can be the length direction of the battery cell.

[0077] The insulating piece 7 can be a lower plastic piece structure, and the insulating piece 7 is mainly used for isolating the end cover 6 and the battery cell. The turnover plate 71 can turn over and cover the adapter piece 3. The cavity 72 can be a space surrounded by a groove structure arranged on the side of the turnover plate 71 facing the adapter piece 3.

[0078] In the technical scheme of the embodiments of the present application, the cavity 72 is arranged to accommodate the conductive coating 2, that is, if the battery cell is prone to generate excessive heat during operation to cause the conductive coating 2 to be in a molten state but not thermal runaway, in order to ensure that the battery cell can continue to be used, the conductive coating 2 is accommodated by the cavity 72, and the turnover plate 71 is used to support the conductive coating 2, so as to avoid the molten conductive coating 2 from falling off.

[0079] It should be noted that the cavity 72 here can only accommodate the conductive coating 2, and the number and size of the cavity 72 are determined according to the design.

[0080] On the other hand, the present application also provides a battery comprising the battery cell.

[0081] In another aspect, the application also provides a power consuming device comprising the battery. The power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a stationary or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0082] The above only describes preferred embodiments of the application and is not used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A battery cell, characterized by, The application relates to a battery tab (1) comprising: an end cover (6); a tab (4); an electrode terminal (5); a transition piece (3) connecting the tab (4) and the electrode terminal (5), wherein one side of the transition piece (3) away from the end cover (6) has a first welding area (51) formed by welding the transition piece (3) and the electrode terminal (5); a conductive coating (2) provided on the side of the transition piece (3) away from the end cover (6) in a first direction (X), wherein the conductive coating (2) covers at least the first welding area (51).

2. The battery cell of claim 1, wherein, The orthogonal projection area of the conductive coating (2) on a projection plane is consistent with the orthogonal projection area of the side of the transition piece (3) away from the end cover (6) on the projection plane, and the projection plane and the first direction (X) are perpendicular to each other.

3. The battery cell of claim 1, wherein, The tab (4) has a second welding area (41) formed by welding the tab (4) and the transition piece (3); the second welding area (41) and the first welding area (51) are located on the two sides of the transition piece (3) in the first direction (X) respectively; the side of the transition piece (3) away from the end cover (6) has a first area corresponding to the position of the second welding area (41); and the conductive coating (2) covers at least the first area. Alternatively, the second welding area (41) and the first welding area (51) are located on the same side of the transition piece (3); and the conductive coating (2) covers at least the second welding area (41).

4. The battery cell according to any one of claims 1 to 3, characterized in that, The side of the transition piece (3) away from the end cover (6) is recessed to form a first groove (31), and the first welding area (51) is formed at the groove bottom of the first groove (31); the conductive coating (2) has a first thickening part (21) at a position corresponding to the first groove (31), the first thickening part (21) covers the first welding area (51), and at least part of the first thickening part (21) is filled in the first groove (31).

5. The battery cell of claim 4, wherein, The transition piece (3) comprises a second thinning part (32) and an un-thinned part (33), the thickness of the second thinning part (32) is smaller than the thickness of the un-thinned part (33), and the second thinning part (32) is welded with the tab (4).

6. The battery cell of claim 1, wherein, The coating density of the electrically conductive coating (2) is 1 g to 3 g / mm 3 and / or, The electrically conductive coating (2) has an electrical conductivity of 10 -7 ~ 10 -2 S / m, and / or, The thickness of the conductive coating (2) is 0.2-1 mm.

7. The battery cell of claim 5, wherein, The thickness of the transition piece (3) at the first groove (31) is h1, the thickness of the second thinning part (32) is h2, and the thickness of the un-thinned part (33) is H, 1 / 10H<=h1<=2 / 3H, 1 / 10H<=h2<=2 / 3H; and / or, 0.2mm<=h1<=0.8mm, 0.2mm<=h2<=0.8mm, and 0.3mm<=H<=1.5mm.

8. The battery cell of claim 1, wherein, The application further relates to a battery tab (1) comprising: An insulating piece (7) is arranged between the end cover (6) and the adapter piece (3), and both ends of the insulating piece (7) in the second direction (Y) are provided with a turnover plate (71), and the side of the turnover plate (71) facing the adapter piece (3) is provided with a cavity (72) for accommodating the conductive coating (2).

9. A battery, characterized by A battery including the battery cell of any one of claims 1 to 8.

10. An electrical device, characterized by A battery including the battery of claim 9.

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