Battery monomer, battery pack and power utilization device

Abstract

The utility model discloses a battery monomer, a battery pack and a power utilization device, the battery monomer comprises a shell, an electrode assembly and an adapter, the shell is provided with a first electrode terminal and a second electrode terminal, the electrode assembly comprises a first tab and a second tab which are opposite in polarity, and the adapter is connected with the first tab. The adapter is arranged between the electrode assembly and the shell and comprises a first adapter part and a second adapter part, the first adapter part is electrically connected with the first electrode terminal and the first tab respectively, and the second adapter part is electrically connected with the second electrode terminal and the second tab respectively; and at least parts of the first switching part and the second switching part are overlapped in the axial direction of the battery monomer. Therefore, the over-current area of the first switching part and the over-current area of the second switching part are increased, the technical problem that the over-current area of the switching piece is small is solved, and the over-current capacity of the switching piece is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery pack and an electrical device. Background Art

[0002] Batteries, especially cylindrical batteries, are widely used in electric vehicles, consumer digital products and other fields due to their unified standards, high energy density, good cycle performance and portability. In order to reduce the volume of the battery, increase the energy density of the battery or facilitate the connection between multiple batteries, the positive and negative poles of the battery are usually placed on the same side of the battery, that is, the positive and negative poles of the battery are led out from the same side.

[0003] However, when the positive and negative electrodes of existing batteries are led out on the same side, the flow area of ​​the positive collector and the negative collector is small, resulting in large resistance, making it impossible to achieve high-power flow, and affecting the performance of the battery. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the present application is to propose a battery cell, the adapter of which has sufficient flow area, so as to solve the technical problems of the positive electrode collector and the negative electrode collector in the prior art having small flow area, large resistance and inability to achieve high power flow, thereby ensuring the performance of the battery cell to a certain extent.

[0005] A second objective of the present application is to provide a battery pack having the above-mentioned battery cell.

[0006] The third objective of the present application is to provide an electrical device having the above-mentioned battery pack.

[0007] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell, the shell being provided with a first electrode terminal and a second electrode terminal; an electrode assembly, the electrode assembly comprising a first pole lug and a second pole lug with opposite polarities; a transition piece, the transition piece being arranged between the electrode assembly and the shell and comprising a first transition portion and a second transition portion, the first transition portion being electrically connected to the first electrode terminal and the first pole lug, respectively, the second transition portion being electrically connected to the second electrode terminal and the second pole lug, respectively, and at least portions of the first transition portion and the second transition portion being overlapped in the axial direction of the battery cell.

[0008] In the technical solution of the embodiment of the present application, by arranging at least part of the first adapter part and the second adapter part to overlap in the axial direction of the battery cell, it is possible to increase the area of ​​the first adapter part and the second adapter part, thereby improving the current passing capacity of the first adapter part and the second adapter part, that is, improving the current passing capacity of the adapter, achieving high-power current passing, and improving the working performance of the battery cell.

[0009] In some embodiments, the first adapter includes a first connection end, a second connection end and a first middle part, the first connection end is electrically connected to the first pole ear, the second connection end is electrically connected to the first electrode terminal, and the first middle part is electrically connected to the first connection end and the second connection end respectively; the second adapter includes a third connection end, a fourth connection end and a second middle part, the third connection end is electrically connected to the second pole ear, the fourth connection end is electrically connected to the second electrode terminal, and the second middle part is electrically connected to the third connection end and the fourth connection end respectively; in a first direction, the first connection end and the third connection end are arranged at intervals, the second connection end and the fourth connection end are arranged at intervals, the first middle part and the second middle part are arranged overlapping in the axial direction of the battery cell, and the first direction intersects with the axial direction. In this way, the area of ​​the first middle part and the second middle part can be increased, thereby improving the flow capacity of the first middle part and the second middle part, that is, improving the flow capacity of the first adapter and the second adapter, achieving high power flow, and improving the working performance of the battery cell.

[0010] In some embodiments, the first middle portion includes a first protruding portion, the first protruding portion protrudes from the first connection end toward the second transition portion; and / or the second middle portion includes a second protruding portion, the second protruding portion protrudes from the third connection end toward the first transition portion. This allows the first middle portion and the second middle portion to be effectively overlapped in the axial direction of the battery cell, thereby ensuring the area of ​​the first middle portion and the second middle portion to a certain extent, improving the flow capacity of the first middle portion and the second middle portion, that is, improving the flow capacity of the first transition portion and the second transition portion.

[0011] In some embodiments, the protruding length of the first protruding portion does not exceed the second middle portion, and the protruding length of the second protruding portion does not exceed the first middle portion. In this way, while ensuring the flow area of ​​the first middle portion and the second middle portion to a certain extent, it can also prevent the first protruding portion from exceeding the second protruding portion and electrically connecting with the second transition portion, the second electrode terminal and / or the second tab to a certain extent, and prevent the second protruding portion from exceeding the first protruding portion and electrically connecting with the first transition portion, the first electrode terminal and / or the first tab to a certain extent, thereby ensuring the working performance of the battery cell to a certain extent.

[0012] In some embodiments, the width of the first middle portion and / or the second middle portion in the first direction is w, and the diameter of the battery cell is D, wherein 3mm≤w≤D-2mm. In this way, while ensuring the area of ​​the first middle portion and the second middle portion to a certain extent, the use cost of the first middle portion and the second middle portion can be reduced, and the first middle portion and the second middle portion can be prevented from exceeding the battery cell and being electrically connected to other structural parts to a certain extent, so as to ensure the working performance of the battery cell to a certain extent.

[0013] In some embodiments, 6mm≤w≤D-4mm. The areas of the first middle portion and the second middle portion are further guaranteed to a certain extent, and the first middle portion and the second middle portion are prevented from exceeding the battery cell and being electrically connected to other structural parts to a certain extent, so as to ensure the working performance of the battery cell to a certain extent.

[0014] In some embodiments, the first adapter is formed as a bent piece, the first connection end, the first middle part and the second connection end are stacked in the second direction, and the second direction intersects the first direction; the second adapter is formed as a bent piece, and the third connection end, the second middle part and the fourth connection end are stacked in the second direction. This makes it easier to connect two structural members spaced apart in the second direction using the first adapter and to connect two structural members spaced apart in the second direction using the second adapter, reduces the difficulty of connecting two structural members spaced apart in the second direction, and helps reduce the radial size of the battery cell and reduces the difficulty of assembling the battery cell.

[0015] In some embodiments, the first adapter is a copper adapter, and the second adapter is an aluminum adapter. In this way, the first adapter and the second adapter can be used to respectively realize the electrical connection between the positive electrode of the electrode assembly and the positive terminal of the shell, and realize the electrical connection between the negative electrode of the electrode assembly and the negative terminal of the shell, thereby ensuring the working performance of the battery cell to a certain extent.

[0016] In some embodiments, the adapter also includes a first insulating member, and in the overlapping direction, the first insulating member is at least located between the first middle portion and the second middle portion, so that the first middle portion and the second middle portion form an insulating match, thereby avoiding the first middle portion and the second middle portion from forming an electrical connection to a certain extent, that is, avoiding the first adapter portion and the second adapter portion from forming an electrical connection to a certain extent, and ensuring the working performance and reliability of the battery cell to a certain extent.

[0017] In some embodiments, at least one of the first middle portion and the second middle portion is provided with a first positioning structure for positioning the first insulating member. Positioning the first insulating member using the first positioning structure can improve the position stability of the first insulating member, so that the first insulating member can be stably arranged between the first protruding portion and the second protruding portion, to a certain extent, avoiding the first protruding portion and the second protruding portion from forming an electrical connection, and at the same time, reducing the difficulty of positioning the first insulating member.

[0018] In some embodiments, the first positioning structure is a positioning hole, and a portion of the first insulating member is accommodated in the first positioning structure, so as to achieve positioning cooperation between the first positioning structure and the first insulating member, thereby facilitating positioning of the first insulating member using the first positioning structure, improving the position stability of the first insulating member, and reducing the difficulty of positioning the first insulating member.

[0019] In some embodiments, the first middle portion is provided with a first receiving groove for receiving the first insulating member; and / or the second middle portion is provided with a second receiving groove for receiving the first insulating member, so that the first insulating member can be effectively arranged between the first protruding portion and the second protruding portion, and the difficulty of assembling the first insulating member is reduced.

[0020] In some embodiments, a portion of the first transition portion is deformed to define the first receiving groove; and / or a portion of the second transition portion is deformed to define the second receiving groove, thereby reducing the difficulty of molding the first receiving groove and / or the second receiving groove.

[0021] In some embodiments, the first middle portion protrudes in a direction away from the second middle portion to form a first receiving groove for receiving the first insulating member between the first middle portion and the second middle portion. In other words, the first receiving groove for receiving the first insulating member is directly provided on the first middle portion, so that the first insulating member can be effectively provided between the first middle portion and the second middle portion, and a groove can be avoided on the second middle portion to a certain extent, thereby reducing the difficulty of forming the receiving groove, thereby reducing the difficulty of assembling the first insulating member.

[0022] In some embodiments, the depth of the first receiving groove is greater than the thickness of the first insulating member, so as to ensure that the first insulating member can be effectively disposed in the first receiving groove, thereby facilitating the first insulating member to be disposed between the first middle portion and the second middle portion, and facilitating the use of the first receiving groove to fix the first insulating member, thereby improving the position stability of the first insulating member.

[0023] In some embodiments, the depth of the first receiving groove is equal to the thickness of the first insulating member. In this way, the first insulating member can be effectively disposed in the first receiving groove, and the second middle part can directly cover the first receiving groove during assembly, thereby avoiding the need to provide a groove for avoiding the first insulating member on the second middle part or a matching protrusion embedded in the first receiving groove on the second middle part, thereby reducing the difficulty of molding the second middle part and ensuring the flatness of the surface of the second middle part to a certain extent.

[0024] In some embodiments, the thickness of the first insulating member is 0.3 mm to 0.7 mm, which can ensure the insulating performance of the first insulating member to a certain extent and reduce the use cost of the first insulating member.

[0025] In some embodiments, the thickness of the first insulating member is 0.5 mm to 0.6 mm, so as to further ensure the insulating performance of the first insulating member to a certain extent and reduce the use cost of the first insulating member.

[0026] In some embodiments, the adapter also includes a second insulating member, which is disposed between the first connection end and the third connection end, so that the first connection end and the third connection end form an insulating match, and to a certain extent, avoid the first connection end and the third connection end from forming an electrical connection, that is, to a certain extent, avoid the first adapter and the second adapter from forming an electrical connection, and to a certain extent, ensure the working performance and reliability of the battery cell.

[0027] In some embodiments, at least one of the first connection end and the third connection end is provided with a second positioning structure for positioning the second insulating member. Positioning the second insulating member using the second positioning structure can improve the position stability of the second insulating member, so that the second insulating member can be stably arranged between the first connection end and the third connection end, to a certain extent, avoiding the first connection end and the third connection end from forming an electrical connection, and at the same time, reducing the difficulty of positioning the second insulating member.

[0028] In some embodiments, the second positioning structure is a positioning hole, and a portion of the second insulating member is accommodated in the second positioning structure, so as to achieve positioning cooperation between the second positioning structure and the second insulating member, thereby facilitating positioning of the second insulating member using the second positioning structure, improving the position stability of the second insulating member, and reducing the difficulty of positioning the second insulating member.

[0029] In some embodiments, the second insulating member is provided with a limiting groove open toward the first connection end and / or the third connection end, and at least part of the first connection end and / or the third connection end fits in the limiting groove, so as to increase the matching strength between the second insulating member and the first adapter and the second adapter, and facilitate the use of the first adapter and the second adapter to define the position of the second insulating member, to a certain extent avoid the second insulating member from changing its position in the axial direction of the battery cell, improve the position stability of the second insulating member, and thus to a certain extent ensure the improvement of the working performance of the second insulating member.

[0030] In some embodiments, the second insulating member is provided with a positioning hole facing the central hole of the electrode assembly. The positioning hole can play a positioning role when the adapter is installed to reduce the difficulty of assembling the adapter, and can also play a venting role when the battery cell has thermal runaway to improve the reliability of the battery cell.

[0031] In some embodiments, the battery cell is a cylindrical battery, which ensures the working performance and reliability of the battery cell to a certain extent.

[0032] In a second aspect, the present application provides a battery pack comprising a plurality of battery cells described in the above embodiments.

[0033] In the technical solution of the embodiment of the present application, the battery cell described in the above embodiment is adopted to realize the adapter described in the above embodiment, thereby ensuring the working performance of the battery pack to a certain extent.

[0034] In a third aspect, the present application provides an electrical device, comprising the battery pack described in the above embodiment, wherein the battery pack is used to provide electrical energy.

[0035] In the technical solution of the embodiment of the present application, by adopting the battery pack described in the above embodiment, the working performance of the electrical device can be effectively guaranteed to a certain extent.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1Schematic diagram of an electrical device according to some embodiments of the present application.

[0039] Figure 2 An exploded view of a battery pack according to some embodiments of the present application.

[0040] Figure 3 is an exploded view of a battery cell according to some embodiments of the present application.

[0041] Figure 4 It is an exploded view between the end cover and the adapter according to some embodiments of the present application.

[0042] Figure 5 It is a schematic diagram of the adapter before bending according to some embodiments of the present application.

[0043] Figure 6 This is an exploded view of the adapter before bending according to some embodiments of the present application.

[0044] Figure 7 It is a top view of the adapter before bending according to some embodiments of the present application.

[0045] Figure 8 for Figure 7 Section view along line AA.

[0046] Fig. 9 It is a schematic diagram of a bending adapter according to some embodiments of the present application.

[0047] Fig.10 This is an exploded view of the adapter after bending according to some embodiments of the present application.

[0048] Reference numerals:

[0049] 1000. Electrical devices;

[0050] 100. Adapter;

[0051] 110. A first transfer unit;

[0052] 111. a first connection end;

[0053] 112. second connection end; 1121. first connection hole;

[0054] 113. first middle portion; 1131. first protruding portion; 1132. first receiving groove;

[0055] 120, second transfer part;

[0056] 121. a third connection terminal;

[0057] 122. fourth connection end; 1221. second connection hole;

[0058] 123. a second middle portion; 1231. a second protruding portion;

[0059] 130, a first insulating member;

[0060] 140. second insulating member; 141. positioning hole;

[0061] 150. A first positioning structure; 160. A second positioning structure;

[0062] 500, battery cell;

[0063] 510, housing;

[0064] 511, a first electrode terminal; 512, a second electrode terminal;

[0065] 513, accommodating chamber;

[0066] 514, end cap;

[0067] 5141, upper plastic; 5142, top cover sheet; 5143, lower plastic;

[0068] 5144, first pole; 5145, second pole;

[0069] 520, electrode assembly; 521, first pole ear; 522, second pole ear;

[0070] 530, blue film;

[0071] 200, controller; 300, motor;

[0072] 400, battery pack; 410, housing; 411, first housing; 412, second housing. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0074] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0075] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0076] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0077] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0078] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0079] The term "plurality" used in the present application refers to two or more (including two).

[0080] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0081] The battery mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may be a battery module or a battery pack. A battery module generally includes multiple battery cells. The battery generally includes a box for encapsulating multiple battery cells or multiple battery modules, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may not include a box.

[0082] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0083] Among them, the positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, and a plurality of positive electrode tabs are stacked together and electrically connected to the positive electrode column. Exemplarily, the stacked plurality of positive electrode tabs can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the stacked plurality of positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0084] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, and multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. Exemplarily, the multiple negative electrode tabs stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, the multiple negative electrode tabs stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column to form an electrical connection between the negative electrode tab sheet and the negative electrode column. The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene.

[0085] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0086] As the application areas of batteries continue to expand, the market demand is also increasing.

[0087] Among them, during the battery manufacturing process, in order to reduce the volume of the battery, increase the energy density of the battery or facilitate electrical connection between multiple batteries, the positive electrode tab and the negative electrode tab of the battery are usually set on the same side, that is, the positive and negative electrodes of the battery are led out from the same side.

[0088] However, when the positive and negative electrodes of existing batteries are led out on the same side, the flow area of ​​the positive collector and the negative collector is small, resulting in large resistance, making it impossible to achieve high-power flow, and affecting the performance of the battery.

[0089] In order to solve the above problems, the embodiment of the present application provides a battery cell 500 that can meet the requirement of leading out the positive and negative poles of the battery on the same side and has a sufficiently large flow area. The specific solution is to overlap at least part of the first adapter part 110 and the second adapter part 120 in the axial direction of the battery cell 500 to ensure the flow area of ​​the first adapter part 110 and the second adapter part 120 to a certain extent, thereby improving the flow capacity of the first adapter part 110 and the second adapter part 120, that is, improving the flow capacity of the adapter 100, so as to ensure the working performance of the battery cell 500 to a certain extent, and solve the technical problem of small flow area and poor flow capacity of the current collecting plate when the positive and negative poles of the battery are led out on the same side in the prior art.

[0090] The embodiment of the present application provides an electric device using the battery disclosed in the present application as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc., the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0091] For the convenience of explanation, the following embodiments take the electric device 1000 as a vehicle as an example, and describe in detail the structures of the electric device 1000, the battery pack 400 and the battery cell 500 of the present application.

[0092] Please refer to Figure 1 , Figure 1 The power-consuming device 1000 provided for some embodiments of the present application is a schematic diagram of the structure of a vehicle. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery pack 400, and the battery pack 400 may be arranged at the bottom, head or tail of the vehicle. The battery pack 400 may be used to power the vehicle, for example, the battery pack 400 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 400 to power the motor 300, for example, for starting, navigating and driving the vehicle. Working power requirements.

[0093] In some embodiments of the present application, the battery pack 400 can not only serve as the operating power source of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0094] Please refer to Figure 2 , Figure 2 The battery cell 500 provided in some embodiments of the present application is used in the structural explosion diagram of the battery pack 400. The battery pack 400 includes a box body 410 and a plurality of battery cells 500, and the battery cells 500 are accommodated in the box body 410. Among them, the box body 410 is used to provide an assembly space for the battery cells 500, and the box body 410 can adopt a variety of structures.

[0095] In some other embodiments of the present application, the battery pack 400 may not include the box body 410, but only include a plurality of battery cells 500, which will not be described in detail here.

[0096] In some embodiments, the box 410 may include a first box 411 and a second box 412, the first box 411 and the second box 412 cover each other, and the first box 411 and the second box 412 jointly define a receiving cavity for accommodating a battery cell. The second box 412 may be a hollow structure with one end open, and the first box 411 may be a plate-like structure, and the first box 411 covers the open side of the second box 412, so that the first box 411 and the second box 412 jointly define a receiving cavity; or the first box 411 and the second box 412 may also be hollow structures with one side open (for example, Figure 2 As shown in FIG. 4 , the open side of the first box body 411 covers the open side of the second box body 412. Of course, the box body 410 formed by the first box body 411 and the second box body 412 can be in various shapes, such as a cylinder or a cuboid.

[0097] In the battery pack 400, multiple battery cells 500 can be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 500 are connected in series and in parallel. Multiple battery cells 500 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 500 is accommodated in the box 410; or, the battery pack 400 can also be a battery module formed by multiple battery cells 500 connected in series, in parallel or in a mixed connection, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the box 410. The battery pack 400 may also include other structures. For example, the battery pack 400 may also include a busbar for realizing electrical connection between multiple battery cells 500.

[0098] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the battery cell 500 provided in some embodiments of the present application. The battery cell is cylindrical, and the axial direction of the battery cell is the axial direction of the electrode assembly. In other embodiments of the present application, the battery cell can also be a rectangular parallelepiped, a polygonal prism, a flat body or other shapes.

[0099] A battery cell 500 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0100] Combination Figure 3 and Figure 4 As shown, the battery cell 500 of the embodiment of the present application includes: a housing 510 , an electrode assembly 520 and a transition piece 100 .

[0101] Among them, Figure 3 As shown, the housing 510 is provided with a first electrode terminal 511 and a second electrode terminal 512 , and the electrode assembly 520 includes a first electrode tab 521 and a second electrode tab 522 , and the first electrode tab 521 and the second electrode tab 522 have opposite polarities.

[0102] In some embodiments, the first pole tab 521 is formed as a positive pole tab, and the second pole tab 522 is formed as a negative pole tab; or, the first pole tab 521 is formed as a negative pole tab, and the second pole tab 522 is formed as a positive pole tab, so that the polarities of the first pole tab 521 and the second pole tab 522 are opposite, thereby ensuring the working performance of the battery cell 500 to a certain extent.

[0103] Combination Figure 3 , Figure 4 and Figure 5As shown, the adapter 100 is disposed between the electrode assembly 520 and the housing 510 and includes a first adapter portion 110 and a second adapter portion 120. The first adapter portion 110 is electrically connected to the first electrode terminal 511 and the first pole tab 521, respectively, and the second adapter portion 120 is electrically connected to the second electrode terminal 512 and the second pole tab 522, respectively. At least part of the first adapter portion 110 and the second adapter portion 120 are overlapped in the axial direction of the battery cell 500. In this way, the electrode assembly 520 is electrically connected to the first electrode terminal 511 and the second electrode terminal 512, so that the current of the electrode assembly 520 can be drawn out by using the first electrode terminal 511 and the second electrode terminal 512, so as to ensure the working performance of the battery cell 500 to a certain extent.

[0104] At the same time, by arranging at least part of the first adapter part 110 and the second adapter part 120 to overlap in the axial direction of the battery cell 500, the area of ​​the first adapter part 110 and the second adapter part 120 can be guaranteed to a certain extent, thereby increasing the flow area of ​​the first adapter part 110 and the second adapter part 120, and improving the flow capacity of the first adapter part 110 and the second adapter part 120, that is, improving the flow capacity of the adapter 100, achieving high-power flow, and improving the working performance of the battery cell 500.

[0105] It can be seen from the above structure that the battery cell 500 of the present application overlaps at least part of the first adapter part 110 and the second adapter part 120 in the axial direction of the battery cell 500 to achieve the purpose of widening the first adapter part 110 and the second adapter part 120, thereby improving the current passing capacity of the first adapter part 110 and the second adapter part 120, achieving high-power current passing, and improving the working performance of the battery cell 500.

[0106] It can be understood that, compared with the prior art, the present application widens the first adapter part 110 and the second adapter part 120 to improve the current passing capacity of the first adapter part 110 and the second adapter part 120, thereby improving the current passing capacity of the adapter 100, ensuring the current passing effect to a certain extent, and facilitating the realization of high-power current passing.

[0107] In some embodiments, in combination Figure 4 and Figure 6 As shown, the first adapter 110 includes a first connection end 111, a second connection end 112 and a first middle portion 113. The first connection end 111 is electrically connected to the first pole tab 521, the second connection end 112 is electrically connected to the first electrode terminal 511, and the first middle portion 113 is electrically connected to the first connection end 111 and the second connection end 112, respectively. This realizes the electrical connection between the first pole tab 521 and the first electrode terminal 511 and reduces the difficulty of the electrical connection between the first pole tab 521 and the first electrode terminal 511.

[0108] In some embodiments, the first adapter portion 110 is formed as a positive electrode adapter portion, and the first connection end 111 of the first adapter portion 110 is used to electrically connect to the first pole ear 521 of the battery cell 500, and the second connection end 112 of the first adapter portion 110 is used to electrically connect to the first electrode terminal 511 of the battery cell 500. In this way, after the first middle portion 113 is electrically connected to the first connection end 111 and the second connection end 112 respectively, the electrical connection between the positive pole ear and the positive terminal can be achieved, which facilitates the use of the positive terminal to draw out the current of the battery cell 500 and reduces the difficulty of connecting the positive pole ear and the positive terminal of the battery cell 500.

[0109] In some embodiments, the first connection end 111, the second connection end 112 and the first middle part 113 are formed as an integral piece. In this way, while achieving electrical connection between the first middle part 113 and the first connection end 111 and the second connection end 112, the connection difficulty between the first middle part 113 and the first connection end 111 and the second connection end 112 can be reduced, and the connection quality can be guaranteed to a certain extent.

[0110] In some embodiments, in combination Figure 4 and Figure 6 As shown, the second adapter 120 includes a third connection end 121, a fourth connection end 122, and a second middle portion 123. The third connection end 121 is electrically connected to the second pole tab 522, the fourth connection end 122 is electrically connected to the second electrode terminal 512, and the second middle portion 123 is electrically connected to the third connection end 121 and the fourth connection end 122, respectively. This realizes the electrical connection between the second pole tab 522 and the second electrode terminal 512, and reduces the difficulty of the electrical connection between the second pole tab 522 and the second electrode terminal 512.

[0111] In some embodiments, the second adapter portion 120 is formed as a negative electrode adapter portion, and the third connection terminal 121 of the second adapter portion 120 is used to electrically connect to the second pole ear 522 of the battery cell 500, and the fourth connection terminal 122 of the second adapter portion 120 is used to electrically connect to the second electrode terminal 512 of the battery cell 500. In this way, after the second middle portion 123 is electrically connected to the third connection terminal 121 and the fourth connection terminal 122 respectively, the electrical connection between the negative pole ear and the negative terminal can be achieved, which facilitates the use of the negative terminal to draw out the current of the battery cell 500 and reduces the difficulty of connecting the negative pole ear of the battery cell 500 with the negative terminal.

[0112] In some embodiments, the third connection end 121, the fourth connection end 122 and the second middle part 123 are formed as an integral piece. In this way, while the second middle part 123 is electrically connected to the third connection end 121 and the fourth connection end 122 respectively, the difficulty of connecting the second middle part 123 with the third connection end 121 and the fourth connection end 122 can be reduced, and the connection quality can be guaranteed to a certain extent.

[0113] It should be noted that the above description is mainly based on the example that the first adapter part 110 is formed as a positive adapter part and the second adapter part 120 is formed as a negative adapter part. In some other embodiments, the first adapter part 110 can be formed as a negative adapter part and the second adapter part 120 can be formed as a positive adapter part.

[0114] Among them, when the first adapter part 110 can be formed as a negative electrode adapter part, the first adapter part 110 is used to connect with the negative electrode ear and the negative terminal of the battery cell 500 respectively; when the second adapter part 120 is formed as a positive electrode adapter part, the second adapter part 120 is used to connect with the positive electrode ear and the positive terminal of the battery cell 500 respectively, which can also be used to realize the electrical connection between the negative electrode ear and the negative terminal of the battery cell 500 and realize the electrical connection between the positive electrode ear and the positive terminal of the battery cell 500, so as to facilitate the current extraction of the battery cell 500.

[0115] In some embodiments, the first adapter 110 is a copper adapter, and the second adapter 120 is an aluminum adapter. In this way, the first adapter 110 and the second adapter 120 can be used to respectively realize the electrical connection between the positive electrode of the electrode assembly 520 and the positive terminal of the housing 510, and realize the electrical connection between the negative electrode of the electrode assembly 520 and the negative terminal of the housing 510, thereby ensuring the working performance of the battery cell 500 to a certain extent.

[0116] In some embodiments, in combination Figure 5 and Figure 6 As shown, in the first direction, the first connection end 111 and the third connection end 121 are spaced apart, the second connection end 112 and the fourth connection end 122 are spaced apart, the first middle portion 113 and the second middle portion 123 are overlapped in the axial direction of the battery cell 500, and the first direction intersects the axial direction. The first direction mentioned here can be understood as Figure 5 In the Y direction of the battery cell 500 shown in the figure, that is, the width direction of the adapter 100, the first connection terminal 111 and the third connection terminal 121 are spaced apart in the first direction, and the second connection terminal 112 and the fourth connection terminal 122 are spaced apart in the first direction, so as to avoid the first adapter part 110 and the second adapter part 120 from forming an electrical connection to a certain extent, thereby ensuring the reliability of the battery cell 500 to a certain extent.

[0117] It should be noted that Figure 5 The X direction shown in FIG. 1 can be understood as the length direction of the adapter 100 before being bent.

[0118] In some embodiments, in combination Figure 5 and Figure 6As shown, the first middle portion 113 includes a first protruding portion 1131, which protrudes from the first connection end 111 toward the second adapter 120; and / or the second middle portion 123 includes a second protruding portion 1231, which protrudes from the third connection end 121 toward the first adapter 110. Here, it means that the protruding portion can be provided on one of the first middle portion 113 and the second middle portion 123, or on both of the first middle portion 113 and the second middle portion 123.

[0119] Among them, when a protruding portion is set on the first middle part 113, the protruding portion is formed as a first protruding portion 1131, and the first protruding portion 1131 protrudes from the first connection end 111 toward the second adapter part 120, so as to ensure the protruding area of ​​the first protruding portion 1131 to a certain extent, thereby increasing the flow area of ​​the first middle part 113 and improving the flow capacity of the first adapter part 110; when a protruding portion is set on the second middle part 123, the protruding portion is formed as a second protruding portion 1231, and the second protruding portion 1231 protrudes from the third connection end 121 toward the first adapter part 110, so as to ensure the protruding area of ​​the second protruding portion 1231 to a certain extent, thereby increasing the flow area of ​​the second middle part 123 and improving the flow capacity of the second adapter part 120.

[0120] That is to say, the present application sets a first protruding portion 1131 on the first middle portion 113; and / or sets a second protruding portion 1231 on the second middle portion 123, so as to ensure the flow area of ​​the adapter 100 to a certain extent, thereby improving the flow capacity of the adapter 100, achieving high-power flow, and improving the working performance of the battery cell 500.

[0121] In some embodiments, Figure 6 As shown, both the first middle portion 113 and the second middle portion 123 are provided with protruding portions, that is, the first middle portion 113 is provided with a first protruding portion 1131 protruding toward the second adapter portion 120 and protruding from the first connection end 111, and the second middle portion 123 is provided with a second protruding portion 1231 protruding toward the first adapter portion 110 and protruding from the third connection end 121, so as to realize widening of the first middle portion 113 and the second middle portion 123 at the same time, ensure the flow area of ​​the first middle portion 113 and the second middle portion 123 to a certain extent, thereby improving the flow capacity of the first middle portion 113 and the second middle portion 123.

[0122] Optionally, the first protruding portion 1131 is integrally formed with the first middle portion 113. That is, the first protruding portion 1131 and the first middle portion 113 are formed as an integral piece, so as to ensure the connection strength between the first protruding portion 1131 and the first middle portion 113 to a certain extent, improve the position stability of the first protruding portion 1131, thereby ensuring that the flow area of ​​the first middle portion 113 can be effectively increased by using the first protruding portion 1131, and at the same time, the connection step between the first protruding portion 1131 and the first middle portion 113 can be omitted, thereby reducing the difficulty of connecting the first protruding portion 1131 and the first middle portion 113.

[0123] Optionally, the second protruding portion 1231 is integrally formed with the second middle portion 123. The beneficial effects produced by the integrally formed second protruding portion 1231 and the first middle portion 113 may refer to the beneficial effects produced by the integrally formed first protruding portion 1131 and the first middle portion 113, which will not be described in detail here.

[0124] In some embodiments, in combination Figure 5 , Figure 7 and Figure 8 As shown, the first middle portion 113 and the second middle portion 123 are overlapped in the axial direction of the battery cell 500. The overlapping arrangement mentioned here can be understood as the first connection end 111 and the third connection end 121, and the second connection end 112 and the fourth connection end 122 are arranged at intervals in the left-right direction, and the first protruding portion 1131 and the second protruding portion 1231 overlap in the up-down direction, which can avoid the first protruding portion 1131 and the second protruding portion 1231 from interfering with each other during the protruding process to a certain extent, thereby ensuring that the first protruding portion 1131 and the second protruding portion 1231 have a sufficiently large protruding area to a certain extent, and further improving the current flow capacity of the first adapter 110 and the second adapter 120.

[0125] In some embodiments, Figure 6 As shown, the first protruding portion 1131 and the second protruding portion 1231 protrude in a direction close to each other and are overlapped to ensure that the first protruding portion 1131 and the second protruding portion 1231 have a sufficiently large protruding area to a certain extent.

[0126] At the same time, by arranging the first protruding portion 1131 and the second protruding portion 1231 to protrude in a direction close to each other, it is possible to avoid increasing the occupied space of the adapter 100 to a certain extent, thereby reducing the difficulty of assembling the adapter 100.

[0127] In some embodiments, the protruding length of the first protruding portion 1131 does not exceed the second middle portion 123, and the protruding length of the second protruding portion 1231 does not exceed the first middle portion 113. In this way, while ensuring the flow area of ​​the first middle portion 123 and the second middle portion 113 to a certain extent, it can also prevent the first protruding portion 1131 from exceeding the second protruding portion 1231 and electrically connecting with the second adapter 120, the second electrode terminal 512 and / or the second pole tab 522 to a certain extent, and prevent the second protruding portion 1231 from exceeding the first protruding portion 1131 and electrically connecting with the first adapter 110, the first electrode terminal 511 and / or the first pole tab 521 to a certain extent, thereby ensuring the working performance of the battery cell 500 to a certain extent.

[0128] In some embodiments, in combination Figure 3 and Figure 7 As shown, the width of the first middle portion 113 and / or the second middle portion 123 in the first direction is w, and the diameter of the battery cell 500 is D, wherein 3 mm≤w≤D-2 mm. That is to say, the width of the first middle part 113 and / or the second middle part 123 in the Y direction is w. The diameter D of the battery cell 500 mentioned here can be understood as the diameter of the shell 510. In a specific example, when the shell 510 has a certain thickness, D refers to the maximum outer diameter of the shell 510. When the width w of the first middle part 113 and / or the second middle part 123 in the first direction is less than 3 mm, the flow area of ​​the first middle part 113 and / or the second middle part 123 will be reduced, affecting the flow capacity of the first middle part 113 and / or the second middle part 123; when the width w of the first middle part 113 and / or the second middle part 123 in the first direction is greater than D-2 mm, the manufacturing cost of the first middle part 113 and / or the second middle part 123 will increase. At the same time, there is also a risk that the first middle part 113 and / or the second middle part 123 is electrically connected to other structural parts beyond the shell 510 of the battery cell 500, thereby affecting the working performance of the battery cell 500.

[0129] Therefore, the present application sets the width w of the first middle part 113 and / or the second middle part 123 in the first direction to be greater than or equal to 3 mm or less than or equal to D-2 mm. This can ensure the area of ​​the first middle part 113 and the second middle part 123 to a certain extent, while reducing the use cost of the first middle part 113 and the second middle part 123, and to a certain extent avoid the first middle part 113 and the second middle part 123 from exceeding the outer shell 510 of the battery cell 500 and being electrically connected to other structural parts, so as to ensure the working performance of the battery cell 500 to a certain extent.

[0130] In some embodiments, 6mm≤w≤D-4mm. While further ensuring the area of ​​the first middle portion 113 and the second middle portion 123 to a certain extent, the use cost of the first middle portion 113 and the second middle portion 123 can be reduced, and the first middle portion 113 and the second middle portion 123 are prevented from being electrically connected to other structural parts beyond the battery cell 500 to a certain extent, so as to ensure the working performance of the battery cell 500 to a certain extent.

[0131] In some embodiments, in the Y direction of the battery cell 500, the first middle portion 113 and the second middle portion 123 are arranged close to the middle of the battery cell 500, so that the two side walls of the first middle portion 113 and the second middle portion 123 in the Y direction are spaced from the side walls of the battery cell 500, and the spacing is 2 mm, so that the width w of the first middle portion 113 and the second middle portion 123 in the first direction is D-4 mm, which ensures the area of ​​the first middle portion 113 and the second middle portion 123 to a certain extent, and avoids the first middle portion 113 and the second middle portion 123 from extending to the outside of the battery cell 500 to a certain extent.

[0132] In some embodiments, in combination Figure 4 , Fig. 9 and Fig.10 As shown, the first adapter 110 is formed as a bending part, and the first connection end 111, the first middle part 113 and the second connection end 112 are stacked in the second direction, and the second direction intersects with the first direction. That is to say, the first adapter 110 of the present application is formed as a bending part. When the first adapter 110 is formed as a bending part, the first connection end 111, the first middle part 113 and the second connection end 112 of the first adapter 110 are stacked in the second direction. The second direction mentioned here can be understood as the height direction of the first adapter 110, that is, Figure 8 The up and down directions shown make it easy to use the first adapter 110 to connect two structural members (such as the first pole ear 521 and the first electrode terminal 511) spaced apart in the second direction, thereby reducing the difficulty of connecting the first pole ear 521 and the first electrode terminal 511 spaced apart in the second direction.

[0133] At the same time, after the first adapter portion 110 is bent, the length dimension of the first adapter portion 110 can be reduced, thereby reducing the radial dimension of the battery cell 500 and reducing the difficulty of assembling the battery cell 500 .

[0134] Optionally, combined Figure 4 , Fig. 9 and Fig.10As shown, the second adapter 120 is formed as a bending piece, and the third connection end 121, the second middle portion 123 and the fourth connection end 122 are stacked in the second direction. That is to say, the second adapter 120 can also be formed as a bending piece. When the second adapter 120 is formed as a bending piece, the third connection end 121, the second middle portion 123 and the fourth connection end 122 of the second adapter 120 are stacked in the second direction, so that it is convenient to use the second adapter 120 to connect two structural members (such as the second pole ear 522 and the second electrode terminal 512) spaced apart in the second direction, thereby reducing the difficulty of connecting the second pole ear 522 and the second electrode terminal 512 spaced apart in the second direction.

[0135] In summary, the adapter 100 of the present application is formed as a bent piece.

[0136] It should be noted that the battery cell 500 of the present application may be cylindrical, flat, rectangular or other shapes, and the embodiments of the present application are not limited to this. For ease of explanation, cylindrical batteries are used as examples in the following embodiments.

[0137] In some embodiments, Figure 3 As shown, the battery cell 500 is a cylindrical battery, which ensures the working performance and reliability of the battery cell to a certain extent.

[0138] In some embodiments, Figure 3 As shown, a accommodating cavity 513 is formed in the outer shell 510, and the electrode assembly 520 is disposed in the accommodating cavity 513, so that the electrode assembly 520 is disposed in the outer shell 510, which makes it convenient to utilize the outer shell 510 to protect the electrode assembly 520, improve the reliability of the electrode assembly 520, and extend the service life of the electrode assembly 520. At the same time, the outer shell 510 can also be used to support the electrode assembly 520, thereby ensuring the position stability of the electrode assembly 520 to a certain extent, which is beneficial to ensuring the working performance of the electrode assembly 520 to a certain extent.

[0139] In some embodiments, one end of the accommodating cavity 513 is open, so that the electrode assembly 520 can be placed in the accommodating cavity 513 using the opening, thereby facilitating the use of the outer shell 510 to support and protect the electrode assembly 520 .

[0140] In some embodiments, in combination Figure 3 and Figure 4 As shown, the shell 510 includes an end cover 514, which is arranged at the opening of the accommodating cavity 513 to achieve a closed opening, thereby preventing external foreign matter from entering the accommodating cavity 513 through the opening to a certain extent, thereby achieving the purpose of using the shell 510 to protect the electrode assembly 520.

[0141] Optionally, combined Figure 3 and Figure 4As shown, the first electrode terminal 511 and the second electrode terminal 512 are arranged on the end cover 514. While realizing that the first electrode terminal 511 and the second electrode terminal 512 are arranged on the outer shell 510, the difficulty of setting the first electrode terminal 511 and the second electrode terminal 512 can also be reduced, thereby facilitating the electrical connection between the first electrode terminal 511 and the first pole ear 521 and the electrical connection between the second electrode terminal 512 and the second pole ear 522, thereby ensuring the working performance of the battery cell 500 to a certain extent.

[0142] In some embodiments, in combination Figure 3 , Figure 4 and Figure 6 As shown, a first connection hole 1121 is provided on the second connection end 112 of the first adapter portion 110, a second connection hole 1221 is provided on the fourth connection end 122 of the second adapter portion 120, and a first pole 5144 and a second pole 5145 are provided on the end cover 514. The first pole 5144 is used to pass through the first connection hole 1121 to electrically connect with the first electrode terminal 511, thereby realizing the electrical connection between the second connection end 112 and the first electrode terminal 511, and the second pole 5145 is used to pass through the second connection hole 1221 to electrically connect with the second electrode terminal 512, thereby realizing the electrical connection between the fourth connection end 122 and the second electrode terminal 512.

[0143] Optionally, combined Figure 3 and Figure 4 As shown, the end cover 514 also includes a lower plastic 5143 and a top cover sheet 5142, and the lower plastic 5143 and the top cover sheet 5142 are connected in cooperation. The first pole 5144 is used to pass through the lower plastic 5143 and the top cover sheet 5142 to be electrically connected to the first electrode terminal 511 respectively, and the second pole 5145 is used to pass through the lower plastic 5143 and the top cover sheet 5142 to be electrically connected to the second electrode terminal 512 respectively. In this way, while realizing the electrical connection between the first pole 5144 and the first electrode terminal 511 and realizing the electrical connection between the second pole 5145 and the second electrode terminal 512, the lower plastic 5143 and the top cover sheet 5142 can also be used to cooperate to support the first pole 5144 and the second pole 5145, so as to improve the position stability of the first pole 5144 and the second pole 5145, thereby facilitating to ensure the connection quality of the first pole 5144 and the second pole 5145 to a certain extent.

[0144] Optionally, combined Figure 3 and Figure 4 As shown, the end cap 514 also includes an upper plastic 5141, and at least a portion of the upper plastic 5141 is disposed between the first electrode terminal 511 and the second electrode terminal 512 to achieve insulation matching between the first electrode terminal 511 and the second electrode terminal 512, to avoid electrical connection between the first electrode terminal 511 and the second electrode terminal 512 to a certain extent, and to ensure the reliability of the battery cell 500 to a certain extent.

[0145] In some embodiments, Figure 3 As shown, the battery cell 500 also includes a blue film 530, which is arranged in the accommodating cavity 513 and located at the periphery of the electrode assembly 520, providing a stable and reliable space for the electrode assembly 520 to ensure the working performance of the electrode assembly 520 to a certain extent, that is, to ensure the working performance of the battery cell 500 to a certain extent.

[0146] In some embodiments, in combination Figure 6 , Figure 7 and Figure 8 As shown, the adapter 100 further includes a first insulating member 130, and in the overlapping direction, the first insulating member 130 is at least located between the first middle portion 113 and the second middle portion 123. Here, it means that in the overlapping direction of the first protruding portion 1131 and the second protruding portion 1231, that is, in the up-down direction of the battery cell 500, the first insulating member 130 is at least located between the first middle portion 113 and the second middle portion 123, so that the first middle portion 113 and the second middle portion 123 form an insulating fit, and to a certain extent, avoid the first middle portion 113 and the second middle portion 123 from forming an electrical connection, and further to a certain extent avoid the first adapter 110 and the second adapter 120 from forming an electrical connection, and to a certain extent ensure the working performance and use reliability of the battery cell 500.

[0147] It should be noted that the overlapping direction mentioned here can also be understood as the height direction of the adapter 100, that is, Figure 8 In the up-down direction shown in FIG. 1 , that is, the first middle portion 113 and the second middle portion 123 overlap in height, and are separated and insulated by the first insulating member 130 in the middle.

[0148] In some embodiments, the first insulating member 130 is formed as a rubber member, which is located between the first middle portion 113 and the second middle portion 123 to achieve insulation matching of the first middle portion 113 and the second middle portion 123 and ensure the insulation effect of the first insulating member 130 to a certain extent.

[0149] In some embodiments, Figure 6As shown, at least one of the first middle portion 113 and the second middle portion 123 is provided with a first positioning structure 150 for positioning the first insulating member 130. That is, the first middle portion 113 and / or the second middle portion 123 is provided with the first positioning structure 150, and the first positioning structure 150 is used to position the first insulating member 130 to improve the position stability of the first insulating member 130, so that the first insulating member 130 can be stably arranged between the first protruding portion 1131 and the second protruding portion 1231, thereby avoiding the first protruding portion 1131 and the second protruding portion 1231 from forming an electrical connection to a certain extent, and improving the working performance of the battery cell 500.

[0150] At the same time, the first positioning structure 150 is used to position the first insulating member 130 , which can also reduce the difficulty of positioning the first insulating member 130 .

[0151] In some embodiments, Figure 6 As shown, the first middle portion 113 and the second middle portion 123 are both provided with a first positioning structure 150. The first insulating member 130 is positioned by using the first positioning structure 150 on the first middle portion 113 and the first positioning structure 150 on the second middle portion 123 at the same time, which can improve the positioning quality, so that the first insulating member 130 can be stably arranged between the first protruding portion 1131 and the second protruding portion 1231.

[0152] In addition, when the first positioning structure 150 is provided on the first middle part 113 and the second middle part 123, the first insulating part 130 can also be used to limit the position of the first adapter part 110 and the second adapter part 120, thereby avoiding relative displacement between the first adapter part 110 and the second adapter part 120 to a certain extent, so as to ensure the structural stability and working performance of the adapter 100 to a certain extent.

[0153] In some embodiments, Figure 6 As shown, the first positioning structure 150 is a positioning hole, and a part of the first insulating member 130 is accommodated in the first positioning structure 150. The first positioning structure 150 and the first insulating member 130 are positioned and matched, so that the first positioning structure 150 is used to position the first insulating member 130, thereby improving the position stability of the first insulating member 130.

[0154] At the same time, by setting the first positioning structure 150 as a positioning hole, the difficulty of matching the first positioning structure 150 with the first insulating member 130 can be reduced, thereby reducing the difficulty of positioning the first insulating member 130.

[0155] In some embodiments, Figure 6As shown, a plurality of positioning holes are provided on the first middle portion 113 and the second middle portion 123 , and the plurality of positioning holes cooperate to position the first insulating member 130 , so as to maximize the position stability of the first insulating member 130 to a certain extent.

[0156] In some embodiments, a positioning protrusion is provided on the first insulating member 130 , and the positioning protrusion can be positioned and matched in the positioning hole to achieve positioning and matching between the first positioning structure 150 and the first insulating member 130 , thereby facilitating positioning of the first insulating member 130 using the first positioning structure 150 .

[0157] In some embodiments, in combination Figure 6 , Figure 7 and Figure 8 As shown, the first middle part 113 is provided with a first receiving groove 1132 for receiving the first insulating member 130; and / or the second middle part 123 is provided with a second receiving groove for receiving the first insulating member 130. Here, it means that the receiving groove for receiving the first insulating member 130 can be provided on one of the first middle part 113 and the second middle part 123, or the receiving groove for receiving the first insulating member 130 can be provided on both the first middle part 113 and the second middle part 123, so that the first insulating member 130 can be provided between the first middle part 113 and the second middle part 123, and then between the first protruding part 1131 and the second protruding part 1231, so that the difficulty of assembling the first insulating member 130 can be reduced while achieving the insulation matching between the first protruding part 1131 and the second protruding part 1231.

[0158] In some embodiments, in combination Figure 6 , Figure 7 and Figure 8 As shown, the first middle portion 113 is provided with a first receiving groove 1132 for receiving the first insulating member 130. Here, it means that the receiving groove is only provided on the first middle portion 113, so that the first insulating member 130 is conveniently provided between the first protruding portion 1131 and the second protruding portion 1231, and the receiving groove can be avoided to a certain extent on the second middle portion 123, so as to reduce the difficulty of molding the second middle portion 123.

[0159] Of course, in some other embodiments, the receiving groove may be provided only on the second middle portion 123. This can facilitate the placement of the first insulating member 130 between the first protruding portion 1131 and the second protruding portion 1231, while also avoiding the need to provide the receiving groove on the first middle portion 113 to a certain extent, thereby reducing the difficulty of molding the first middle portion 113.

[0160] In some embodiments, a portion of the first adapter 110 is deformed to define the first receiving groove 1132. Here, when the receiving groove is provided on the first middle portion 113, a portion of the first adapter 110 is deformed to define the first receiving groove 1132, thereby reducing the difficulty of molding the first receiving groove 1132, and facilitating the first insulating member 130 to be disposed between the first protruding portion 1131 and the second protruding portion 1231, so as to achieve the insulation matching of the first protruding portion 1131 and the second protruding portion 1231.

[0161] It should be noted that the deformation of a portion of the first adapter portion 110 mentioned here may be bending a portion of the first adapter portion 110 to define the first accommodating groove 1132 ; or, digging a groove on a side surface of the first adapter portion 110 to define the first accommodating groove 1132 .

[0162] In some embodiments, in combination Figure 6 , Figure 7 and Figure 8 As shown, a portion of the first adapter part 110 is bent to define a first accommodating groove 1132. In this way, while forming the first accommodating groove 1132, the structural strength of the first adapter part 110 can be guaranteed to a certain extent, thereby ensuring the working performance of the first adapter part 110 to a certain extent and extending the service life of the first adapter part 110.

[0163] In some embodiments, a portion of the second transition portion 120 is deformed to define the second receiving groove. That is, when the receiving groove is provided on the second middle portion 123, a portion of the second transition portion 120 is deformed to define the second receiving groove, thereby reducing the difficulty of forming the second receiving groove.

[0164] The deformation of a portion of the second adapter portion 120 mentioned here may be bending a portion of the second adapter portion 120 to define the second receiving groove; or digging a groove on a side surface of the second adapter portion 120 to define the second receiving groove.

[0165] In some embodiments, the first middle portion 113 protrudes in a direction away from the second middle portion 123 to form a first receiving groove 1132 for receiving the first insulating member 130 between the first middle portion 113 and the second middle portion 123. In other words, the first receiving groove 1132 for receiving the first insulating member 130 is directly provided on the first middle portion 113, so that the first insulating member 130 can be effectively provided between the first middle portion 113 and the second middle portion 123, and at the same time, it can also be avoided to a certain extent that the groove is not formed on the second middle portion 123, thereby reducing the difficulty of forming the receiving groove, thereby reducing the difficulty of assembling the first insulating member 130.

[0166] In some embodiments, the depth of the first receiving groove 1132 is greater than the thickness of the first insulating member 130. This ensures that the first insulating member 130 can be effectively disposed in the first receiving groove 1132, thereby facilitating the first insulating member 130 to be disposed between the first middle portion 113 and the second middle portion 123, and facilitating the use of the first receiving groove 1132 to fix the first insulating member 130, thereby improving the position stability of the first insulating member 130.

[0167] In some embodiments, the depth of the first receiving groove 1132 is equal to the thickness of the first insulating member 130. In this way, the first insulating member 130 can be effectively disposed in the first receiving groove 1132, and the second middle portion 123 can be directly covered on the first receiving groove 1132 during assembly, thereby avoiding the need to provide a groove on the second middle portion 123 to avoid the first insulating member 130 or a matching protrusion on the second middle portion 123 to be embedded in the first receiving groove 1132, thereby reducing the difficulty of molding the second middle portion 123 and ensuring the flatness of the surface of the second middle portion 123 to a certain extent.

[0168] In some embodiments, the thickness of the first insulating member 130 is 0.3 mm to 0.7 mm. Figure 8 As shown in T, when the thickness of the first insulating member 130 is less than 0.3 mm, the insulation performance of the first insulating member 130 will be reduced; when the thickness of the first insulating member 130 is greater than 0.7 mm, on the one hand, the manufacturing cost of the first insulating member 130 will be increased, and on the other hand, the axial height of the battery cell 500 will be increased, thereby increasing the occupied area of ​​the battery cell 500.

[0169] Therefore, the present application sets the thickness of the first insulating member 130 to 0.3 mm to 0.7 mm, which can improve the insulation performance of the first insulating member 130 while reducing the manufacturing cost of the first insulating member 130 and reducing the height of the battery cell 500, thereby reducing the difficulty of assembling the battery cell 500.

[0170] In some embodiments, the thickness of the first insulating member 130 is 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc.

[0171] In some embodiments, the thickness of the first insulating member 130 is 0.5 mm to 0.6 mm, so as to further improve the insulation performance of the first insulating member 130 , reduce the manufacturing cost of the first insulating member 130 , and reduce the height of the battery cell 500 .

[0172] In some embodiments, in combination Figure 5 , Figure 6 and Figure 7As shown, the adapter 100 further includes a second insulating member 140, which is disposed between the first connection end 111 and the third connection end 121. The first connection end 111 and the third connection end 121 form an insulating match, which to a certain extent prevents the first connection end 111 and the third connection end 121 from forming an electrical connection, and further to a certain extent prevents the first adapter 110 and the second adapter 120 from forming an electrical connection, thereby ensuring the working performance and reliability of the battery cell 500 to a certain extent.

[0173] In some embodiments, the second insulating member 140 is formed as a rubber member, which is disposed between the first connection end 111 and the third connection end 121 to achieve insulation matching between the first connection end 111 and the third connection end 121 and ensure the insulation effect of the second insulating member 140 to a certain extent.

[0174] In some embodiments, Figure 6 As shown, at least one of the first connection terminal 111 and the third connection terminal 121 is provided with a second positioning structure 160 for positioning the second insulating member 140. That is, the first connection terminal 111 and / or the third connection terminal 121 is provided with a second positioning structure 160, and the second positioning structure 160 is used to position the second insulating member 140 to improve the position stability of the second insulating member 140, so that the second insulating member 140 can be stably arranged between the first connection terminal 111 and the third connection terminal 121, thereby avoiding the first connection terminal 111 and the third connection terminal 121 from forming an electrical connection to a certain extent, and improving the working performance of the battery cell 500.

[0175] At the same time, the second positioning structure 160 is used to position the second insulating member 140 , which can also reduce the difficulty of positioning the second insulating member 140 .

[0176] In some embodiments, Figure 6 As shown, the first connection end 111 and the third connection end 121 are both provided with a second positioning structure 160. The second insulating member 140 is positioned by using the second positioning structure 160 on the first connection end 111 and the second positioning structure 160 on the third connection end 121 at the same time, which can improve the positioning quality, so that the second insulating member 140 can be stably arranged between the first connection end 111 and the third connection end 121.

[0177] In addition, when the second positioning structure 160 is provided on both the first connection end 111 and the third connection end 121, the first connection end 111 and the third connection end 121 can also be utilized to cooperate and support the second insulating member 140, thereby improving the position stability of the second insulating member 140 and ensuring that the first connection end 111 and the third connection end 121 can be insulated by utilizing the second insulating member 140. The second insulating member 140 can also be utilized to limit the position of the first adapter portion 110 and the second adapter portion 120, thereby avoiding relative displacement between the first adapter portion 110 and the second adapter portion 120 to a certain extent, thereby ensuring the structural stability and working performance of the adapter 100 to a certain extent.

[0178] In some embodiments, Figure 6 As shown, the second positioning structure 160 is a positioning hole, and a part of the second insulating member 140 is accommodated in the second positioning structure 160. The second positioning structure 160 and the second insulating member 140 are positioned and matched, so that the second positioning structure 160 is used to position the second insulating member 140, thereby improving the position stability of the second insulating member 140.

[0179] At the same time, by setting the second positioning structure 160 as a positioning hole, the difficulty of matching the second positioning structure 160 with the second insulating member 140 can be reduced, thereby reducing the difficulty of positioning the second insulating member 140.

[0180] In some embodiments, Figure 6 As shown, a plurality of positioning holes are provided on the first connection end 111 and the third connection end 121 , and the plurality of positioning holes cooperate to position the second insulating member 140 , so as to maximize the position stability of the second insulating member 140 to a certain extent.

[0181] In some embodiments, a positioning protrusion is provided on the second insulating member 140 , and the positioning protrusion can be positioned and matched in the positioning hole to achieve positioning and matching between the second positioning structure 160 and the second insulating member 140 , thereby facilitating positioning of the second insulating member 140 using the second positioning structure 160 .

[0182] It should be noted that the positioning protrusion and the positioning hole cooperate to avoid the second insulating member 140 from shifting in the X and Y directions of the battery cell 500 to a certain extent, that is, to avoid the second insulating member 140 from moving radially along the battery cell 500 to a certain extent.

[0183] In some embodiments, the second insulating member 140 is provided with a limiting groove open toward the first connection end 111 and / or the third connection end 121, and at least a portion of the first connection end 111 and / or the third connection end 121 fits in the limiting groove. This increases the matching strength between the second insulating member 140 and the first adapter portion 110 and the second adapter portion 120, and facilitates the use of the first adapter portion 110 and the second adapter portion 120 to define the position of the second insulating member 140, thereby preventing the second insulating member 140 from changing its position in the axial direction of the battery cell 500 to a certain extent, and improving the position stability of the second insulating member 140, thereby ensuring to a certain extent that the working performance of the second insulating member 140 is improved.

[0184] In other words, by providing the limiting groove, the second insulating member 140 is mainly prevented from being positionally offset along the axial direction of the battery cell 500 to a certain extent, thereby ensuring the position stability of the second insulating member 140 to a certain extent and improving the insulation effect of the second insulating member 140 .

[0185] In some embodiments, Figure 5 and Figure 7 As shown, the second insulating member 140 is provided with a positioning hole 141 facing the central hole of the electrode assembly 520. The positioning hole 141 can cooperate with the central hole of the electrode assembly 520 to position the adapter 100 when the adapter 100 is installed, thereby reducing the difficulty of assembling the adapter 100. On the other hand, when the battery cell 500 has thermal runaway, it can also play a venting role to improve the reliability of the battery cell 500.

[0186] The battery cell 500 of the present application is described in detail below with reference to the accompanying drawings in the specification. The battery cell 500 is a cylindrical battery.

[0187] like Figure 3 and Figure 4 As shown, the battery cell 500 includes: a housing 510 , an electrode assembly 520 and a transition piece 100 .

[0188] Among them, Figure 3 As shown, a housing 510 forms a housing cavity 513, an electrode assembly 520 is disposed in the housing cavity 513, the electrode assembly 520 includes a first pole ear 521 and a second pole ear 522, the first pole ear 521 and the second pole ear 522 have opposite polarities, a blue film 530 is disposed in the housing cavity 513 and is located at the periphery of the electrode assembly 520, and the housing 510 includes an end cover 514, and the end cover 514 is disposed at the opening of the housing cavity 513.

[0189] Combination Figure 3 and Figure 4As shown, the end cover 514 also includes an upper plastic 5141, a lower plastic 5143, a top cover sheet 5142, a first pole 5144 and a second pole 5145, the first pole 5144 and the second pole 5145 are positive and negative poles, the lower plastic 5143 and the top cover sheet 5142 are matched and connected, the upper plastic 5141 is arranged on a side of the top cover sheet 5142 away from the lower plastic 5143, the upper plastic 5141 is provided with a first electrode terminal 511 and a second electrode terminal 512, the first electrode terminal 511 and the second electrode terminal 512 are copper-aluminum riveted blocks, the first pole 5144 passes through the lower plastic 5143 and the top cover sheet 5142 respectively to be electrically connected to the first electrode terminal 511, and the second pole 5145 passes through the lower plastic 5143 and the top cover sheet 5142 respectively to be electrically connected to the second electrode terminal 512.

[0190] Combination Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the adapter 100 is disposed between the electrode assembly 520 and the housing 510 and includes a first adapter portion 110 , a second adapter portion 120 , a first insulating member 130 and a second insulating member 140 .

[0191] Combination Figure 6 , Fig. 9 and Fig.10 As shown, the first adapter part 110 is a copper adapter part, and the first adapter part 110 includes a first connection end 111, a second connection end 112 and a first middle part 113. The first adapter part 110 is formed as a bending part so that the first connection end 111, the first middle part 113 and the second connection end 112 are stacked in the upper and lower directions of the battery cell 500. The first connection end 111 is electrically connected to the first pole ear 521, and the second connection end 112 is provided with a first connection hole 1121. The first pole 5144 passes through the first connection hole 1121 and is electrically connected to the second connection end 112 to realize the electrical connection between the second connection end 112 and the first electrode terminal 511, and the first middle part 113 is electrically connected to the first connection end 111 and the second connection end 112 respectively.

[0192] Combination Figure 6 , Fig. 9 and Fig.10As shown, the second adapter part 120 is an aluminum adapter part, and the second adapter part 120 includes a third connection end 121, a fourth connection end 122 and a second middle part 123, so that the third connection end 121, the second middle part 123 and the fourth connection end 122 are stacked in the up and down directions of the battery cell 500, the third connection end 121 is electrically connected to the second pole ear 522, and the fourth connection end 122 is provided with a second connection hole 1221, the second pole 5145 passes through the second connection hole 1221 and is electrically connected to the fourth connection end 122 to realize the electrical connection between the fourth connection end 122 and the second electrode terminal 512, and the second middle part 123 is electrically connected to the third connection end 121 and the fourth connection end 122 respectively, thereby realizing the electrical connection between the first electrode terminal 511 and the first pole ear 521 and realizing the electrical connection between the second electrode terminal 512 and the second pole ear 522.

[0193] Combination Figure 5 and Figure 6 As shown, in the Y direction of the battery cell 500, the first connection end 111 and the third connection end 121 are spaced apart, the second connection end 112 and the fourth connection end 122 are spaced apart, the first middle portion 113 includes a first protruding portion 1131, the first protruding portion 1131 protrudes from the first connection end 111 toward the second adapter portion 120, and the protruding length of the first protruding portion 1131 does not exceed the second middle portion 123, the second middle portion 123 includes a second protruding portion 1231, the second protruding portion 1231 protrudes from the third connection end 121 toward the first adapter portion 110, and the protruding length of the second protruding portion 1231 does not exceed the first middle portion 113, the first middle portion 113 and the second middle portion 123 are overlapped in the axial direction of the battery cell 500 to achieve widening of the middle portions of the first adapter portion 110 and the second adapter portion 120.

[0194] The width w of the first middle portion 113 and the second middle portion 123 in the Y direction is D-4 mm, where D is the diameter of the battery cell 500 .

[0195] Combination Figure 6 , Figure 7 and Figure 8As shown, the first middle portion 113 protrudes in a direction away from the second middle portion 123 so that the first middle portion 113 and the second middle portion 123 are offset in the height direction of the battery cell 500, thereby facilitating the formation of a first accommodating groove 1132 for accommodating the first insulating member 130 between the first middle portion 113 and the second middle portion 123. The thickness of the first insulating member 130 is 0.5 mm, and the groove depth of the first accommodating groove 1132 is equal to the thickness of the first insulating member 130. The first insulating member 130 is arranged in the first accommodating groove 1132 to achieve the first insulating member 130 being arranged between the first middle portion 113 and the second middle portion 123, so that the first middle portion 113 and the second middle portion 123 can be separated by the first insulating member 130. Positioning holes for positioning the first insulating member 130 are provided in the middle and upper parts of the first middle portion 113 and the second middle portion 123, and a part of the first insulating member 130 is accommodated in the positioning holes.

[0196] Combination Figure 5 , Figure 6 and Figure 7 As shown, the second insulating member 140 is arranged between the first connecting end 111 and the third connecting end 121, and a positioning hole 141 is provided on the second insulating member 140, which is opposite to the central hole of the electrode assembly 520. The second insulating member 140 is provided with limiting grooves open toward the first connecting end 111 and the third connecting end 121 at both ends in the Y direction, and at least a portion of the first connecting end 111 and the third connecting end 121 fits in the limiting grooves. The first connecting end 111 and the third connecting end 121 are both provided with positioning holes for positioning the second insulating member 140, and a portion of the second insulating member 140 is accommodated in the positioning holes.

[0197] The battery pack 400 of the second embodiment of the present application is described below with reference to the drawings in the specification.

[0198] like Figure 2 As shown, the battery pack 400 of the embodiment of the present application includes a plurality of battery cells 500 of the above-mentioned embodiments.

[0199] Since the battery cell 500 of the embodiment of the present application has the above-mentioned technical effects, the battery pack 400 of the embodiment of the present application also has the above-mentioned technical effects, that is, by adopting the battery cell 500 of the present application, the working performance of the battery pack 400 can be effectively guaranteed to a certain extent.

[0200] It should be noted that, in the battery pack 400 , the multiple battery cells 500 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 500 may be connected in series or in parallel.

[0201] The following describes the electrical device 1000 of the third embodiment of the present application with reference to the drawings in the specification.

[0202] like Figure 1 As shown, the electric device 1000 of the embodiment of the present application includes the battery pack 400 of the above embodiment.

[0203] Since the battery pack 400 of the embodiment of the present application has the above technical effects, the electric device 1000 of the embodiment of the present application also has the above technical effects, that is, by adopting the battery pack 400 of the present application, the working performance of the electric device 1000 can be effectively guaranteed to a certain extent.

[0204] It is understandable that other structures and operations of the battery cell 500 , the battery pack 400 and the electrical device 1000 according to the embodiment of the present application are known to ordinary technicians in the field and will not be described in detail here.

[0205] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0206] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing, wherein the housing is provided with a first electrode terminal and a second electrode terminal; An electrode assembly, the electrode assembly comprising a first electrode tab and a second electrode tab of opposite polarities; An adapter, which is arranged between the electrode assembly and the shell and includes a first adapter portion and a second adapter portion, the first adapter portion is electrically connected to the first electrode terminal and the first pole tab respectively, the second adapter portion is electrically connected to the second electrode terminal and the second pole tab respectively, and at least parts of the first adapter portion and the second adapter portion are overlapped in the axial direction of the battery cell.

2. The battery cell according to claim 1, characterized in that: The first transfer portion includes a first connection end, a second connection end and a first middle portion, the first connection end is electrically connected to the first electrode tab, the second connection end is electrically connected to the first electrode terminal, and the first middle portion is electrically connected to the first connection end and the second connection end respectively; A second transition portion, the second transition portion includes a third connection end, a fourth connection end and a second middle portion, the third connection end is electrically connected to the second electrode tab, the fourth connection end is electrically connected to the second electrode terminal, and the second middle portion is electrically connected to the third connection end and the fourth connection end, respectively; in a first direction, the first connection end and the third connection end are spaced apart, the second connection end and the fourth connection end are spaced apart, the first middle portion and the second middle portion are overlapped in the axial direction of the battery cell, and the first direction intersects with the axial direction.

3. The battery cell according to claim 2, characterized in that: The first middle portion includes a first protruding portion, and the first protruding portion protrudes from the first connecting end toward the second transition portion; And / or, the second middle portion includes a second protruding portion, and the second protruding portion protrudes from the third connecting end toward the first transition portion.

4. The battery cell according to claim 3, characterized in that: The protruding length of the first protruding portion does not exceed that of the second middle portion, and the protruding length of the second protruding portion does not exceed that of the first middle portion.

5. The battery cell according to claim 4, characterized in that: The width of the first middle portion and / or the second middle portion in the first direction is w, and the diameter of the battery cell is D, wherein 3 mm ≤ w ≤ D-2 mm.

6. The battery cell according to claim 5, characterized in that: 6mm≤w≤D-4mm.

7. The battery cell according to claim 2, wherein the first transition portion is formed as a bent piece, the first connection end, the first middle portion and the second connection end are stacked in a second direction, and the second direction intersects the first direction; The second transition portion is formed as a bent piece, and the third connection end, the second middle portion and the fourth connection end are stacked in the second direction.

8. The battery cell according to claim 2, wherein the first transition portion is a copper transition portion; The second transition portion is an aluminum transition portion.

9. The battery cell according to claim 2, characterized in that: A first insulating member is further included. In the overlapping direction, the first insulating member is at least located between the first middle portion and the second middle portion.

10. The battery cell according to claim 9, characterized in that: At least one of the first middle portion and the second middle portion is provided with a first positioning structure for positioning the first insulating member.

11. The battery cell according to claim 10, characterized in that: The first positioning structure is a positioning hole, and a portion of the first insulating member is accommodated in the first positioning structure.

12. The battery cell according to claim 9, characterized in that: The first middle portion is provided with a first receiving groove for receiving the first insulating member; And / or, the second middle portion is provided with a second accommodating groove for accommodating the first insulating member.

13. The battery cell according to claim 12, characterized in that: A portion of the first transition portion is deformed to define the first receiving groove; And / or, a portion of the second transition portion is deformed to define a second accommodating groove.

14. The battery cell according to claim 9, characterized in that: The first middle portion protrudes in a direction away from the second middle portion to form a first receiving groove for receiving the first insulating member between the first middle portion and the second middle portion.

15. The battery cell according to claim 14, characterized in that: A groove depth of the first accommodating groove is greater than a thickness of the first insulating member.

16. The battery cell according to claim 15, characterized in that: The groove depth of the first accommodating groove is equal to the thickness of the first insulating member.

17. The battery cell according to claim 15, characterized in that: The thickness of the first insulating member is 0.3 mm to 0.7 mm.

18. The battery cell according to claim 17, characterized in that: The thickness of the first insulating member is 0.5 mm to 0.6 mm.

19. The battery cell according to claim 2, characterized in that: The device further includes a second insulating member, wherein the second insulating member is disposed between the first connecting end and the third connecting end.

20. The battery cell according to claim 19, characterized in that: At least one of the first connection end and the third connection end is provided with a second positioning structure for positioning the second insulating member.

21. The battery cell according to claim 20, characterized in that: The second positioning structure is a positioning hole, and a portion of the second insulating member is accommodated in the second positioning structure.

22. The battery cell according to claim 19, characterized in that: The second insulating member is provided with a limiting groove which is open toward the first connecting end and / or the third connecting end, and at least a portion of the first connecting end and / or the third connecting end fits in the limiting groove.

23. The battery cell according to claim 19, characterized in that: The second insulating member is provided with a positioning hole facing the central hole of the electrode assembly.

24. The battery cell according to any one of claims 1 to 23, wherein the battery cell is a cylindrical battery.

25. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 24.

26. An electrical device, characterized in that: The battery pack according to claim 25 is used to provide electrical energy.

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