Switching component, battery monomer, battery and power utilization device

Abstract

The embodiment of the invention provides a switching component, a battery monomer, a battery and a power utilization device. The switching component comprises a tab connecting part, a terminal connecting part and a bending part, the tab connecting part is used for being connected with a tab of a single battery, the terminal connecting part is used for being connected with an electrode terminal of the single battery, the tab connecting part and the terminal connecting part are arranged in a staggered mode in the thickness direction of the tab connecting part, and the bending part is connected with the tab connecting part and the terminal connecting part. The terminal connecting part is close to the electrode terminal, so that the terminal connecting part is conveniently connected with the electrode terminal, the butt joint precision between the terminal connecting part and the electrode terminal is improved, and the quality of the battery is further improved.

Description

Adapter components, battery cells, batteries and electrical devices

[0001] The present application belongs to the field of battery technology, and in particular relates to a switching component, a battery cell, a battery and an electrical device.

[0002] As the consumption of natural resources and environmental damage become increasingly serious, various fields are increasingly interested in devices that can store energy and effectively utilize the stored energy. Battery cells are systems that can be combined with each other to utilize new renewable energy.

[0003] In the field of battery equipment technology, improving the quality of batteries is an urgent problem to be solved.

[0004] Application Contents

[0005] The embodiments of the present application provide a transition component, a battery cell, a battery and an electrical device, which can improve the docking accuracy between the transition component and the electrode terminal and / or the tab, thereby improving the battery quality.

[0006] In a first aspect of the embodiments of the present application, a transition component of a battery cell is provided, comprising a tab connection portion, a terminal connection portion and a bending portion. The tab connection portion is used to connect the tab of the battery cell, the terminal connection portion is used to connect the electrode terminal of the battery cell, the tab connection portion and the terminal connection portion are staggered in the thickness direction of the tab connection portion, and the bending portion connects the tab connection portion and the terminal connection portion.

[0007] By adopting the above structure, the terminal connection part and the tab connection part are staggered, which facilitates the connection between the terminal connection part and the electrode terminal, improves the docking accuracy between the terminal connection part and the electrode terminal, and thus improves the battery quality.

[0008] In some optional embodiments of the present application, the bending portion is inclined from the tab connecting portion toward the terminal connecting portion.

[0009] By adopting the above structure, the bending portion is inclined from the pole lug connection portion toward the terminal connection portion, so that the pole lug connection portion and the terminal connection portion can be relatively far apart, so that multiple transition components have a larger avoidance space when stacked, and can accommodate terminal connection portions and pole lug connection portions with different heights in the thickness direction, thereby reducing the position difference between the upper and lower transition components and the upper transition components in the stacking direction, and reducing the decrease in connection accuracy between the transition components and the electrode terminals and / or pole lugs due to the difference in the stacking position of the transition components.

[0010] In some optional embodiments of the present application, the angle between the bending portion and the thickness direction is α, satisfying 30°≤α≤60°.

[0011] By adopting the above structure, by limiting the inclination angle of the bending portion, on the one hand, it can prevent the inclination angle from being too small, resulting in the bending portion needing a longer size to obtain sufficient avoidance space. On the other hand, it can also prevent the inclination angle from being too large, resulting in the bending portion being too small and failing to meet the need for avoidance space.

[0012] In some optional embodiments of the present application, the terminal connecting portion, the bending portion, and the tab connecting portion are arranged in sequence along a first direction, and the first direction is perpendicular to the thickness direction.

[0013] With the above structure, by arranging the terminal connection part, the bending part and the tab connection part in sequence along the first direction, the terminal connection part can be relatively far away from the tab connection part, thereby reducing mutual interference between the terminal connection part and the tab connection part.

[0014] In some optional embodiments of the present application, the thickness of the terminal connecting portion is D1, the thickness of the tab connecting portion is D2, and the thickness of the bending portion is D3, satisfying D1≤D3≤D2.

[0015] By adopting the above structure, by limiting the thickness relationship between the terminal connection part, the bending part and the tab connection part, on the one hand, the tab connection part can be made thicker to facilitate the connection between the tab connection part and the tab, and the terminal connection part can be made thinner to facilitate the connection between the terminal connection part and the electrode terminal. On the other hand, the bending part can have the thickest thickness to improve the connection strength between the tab connection part and the terminal connection part.

[0016] In some optional embodiments of the present application, the thickness of the terminal connecting portion is D1, the thickness of the tab connecting portion is D2, and the thickness of the bending portion is D3, satisfying 0.3mm≤D1≤D3≤D2≤3mm.

[0017] By adopting the above structure, by limiting the thickness of the terminal connection part, the bending part and the tab connection part, on the one hand, the tab connection part and the terminal connection part can have a certain thickness to meet the connection requirements between the tab connection part and the tab and between the terminal connection part and the electrode terminal; on the other hand, it can prevent the thickness of the tab connection part, the terminal connection part and the bending part from being too large, occupying the space in the battery and causing the battery energy density to decrease.

[0018] In some optional embodiments of the present application, along a second direction, a size of the tab connection portion is greater than a size of the terminal connection portion, and the second direction is perpendicular to the first direction and the thickness direction.

[0019] By adopting the above structure, by reducing the size of the terminal connecting part in the second direction, a larger redundant space can be provided in the second direction when the adapter component is installed, which facilitates adjustment of the relative position between the terminal connecting part and the electrode terminal and improves installation accuracy.

[0020] In some optional embodiments of the present application, along the second direction, the size of the terminal connecting portion is D4, and the size of the tab connecting portion is D5, satisfying 0<D5-D4≤0.5mm.

[0021] By adopting the above structure, by limiting the width of the terminal connection part and the tab connection part in the second direction, on the one hand, the terminal connection part can be made redundant in the second direction; on the other hand, it can prevent the width of the terminal connection part in the second direction from being too small, thereby affecting the connection between the terminal connection part and the electrode terminal.

[0022] In some optional embodiments of the present application, the pole lug connection portion includes a first surface close to the pole lug side and a second surface away from the pole lug side, and the terminal connection portion includes a third surface close to the electrode terminal side and a fourth surface away from the electrode terminal side, and along the thickness direction, the size from the first surface to the fourth surface is H1, satisfying H1≥D2, and / or, along the thickness direction, the size from the second surface to the third surface is H2, satisfying H2≥D1.

[0023] By adopting the above structure, by limiting the distances between the first surface, the second surface, the third surface and the fourth surface, when the adapter components are stacked, the ear connection portion of the previous adapter component in the thickness direction can be higher than the terminal connection portion of the next adapter component, that is, a stacking space is formed, which is convenient for placing the next adapter component; or when the adapter components are stacked, the terminal connection portion of the previous adapter component in the thickness direction can be higher than the ear connection portion of the next adapter component, that is, a stacking space is formed, which is convenient for placing the next adapter component.

[0024] In a second aspect of the embodiment of the present application, a battery cell is provided, comprising a housing, an electrode terminal, an electrode assembly and the above-mentioned adapter component. The housing is provided with a receiving cavity, the electrode terminal is provided in the housing, the electrode assembly is received in the receiving cavity, and the adapter component is used to connect the electrode terminal and the electrode assembly.

[0025] According to a third aspect of the embodiments of the present application, a battery is provided, comprising the above-mentioned battery cell.

[0026] According to a fourth aspect of the embodiments of the present application, there is provided an electrical device comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy.

[0027] Compared with the related art, in the adapter component, battery cell, battery and electrical device of the embodiments of the present application, by bringing the terminal connecting part close to the electrode terminal, it is convenient to connect the terminal connecting part with the electrode terminal, thereby improving the docking accuracy between the terminal connecting part and the electrode terminal, and thus improving the battery quality.

[0028] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods of the present application will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.

[0030] FIG. 2 is a schematic diagram of the structure of a battery provided in some embodiments of the present application.

[0031] FIG. 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0032] FIG. 4 is a schematic diagram of the structure of a transition component and an end cover provided in some embodiments of the present application.

[0033] FIG. 5 is a schematic diagram of the structure of a transition component provided in some embodiments of the present application.

[0034] FIG. 6 is a schematic diagram of stacking adapter components provided in some embodiments of the present application.

[0035] FIG. 7 is a schematic diagram of the structure of the adapter component provided in some embodiments of the present application from another perspective.

[0036] FIG. 8 is a schematic diagram of stacking adapter components provided in other embodiments of the present application.

[0037] FIG. 9 is a schematic diagram of stacking adapter components provided in some other embodiments of the present application.

[0038] FIG. 10 is a partial enlarged schematic diagram of point A in FIG. 7 .

[0039] FIG. 11 is a schematic diagram of the structure of the adapter component provided in some embodiments of the present application from another perspective.

[0040] In the attached figure:

[0041] 1000, vehicle; 100, battery; 200, controller; 300, motor; 110, housing; 111, first housing portion; 112, second housing portion; 10, battery cell; 120, housing; 121, end cap; 122, housing; 130, electrode assembly; 131, tab; 140, electrode terminal; 150, adapter component;

[0042] 151. Tab connection portion; 152. Terminal connection portion; 153. Bend portion; 154. Concave portion; 155. First surface; 156. Second surface; 157. Third surface; 158. Fourth surface.

[0043] The following detailed description of the implementation of the technical solution of the present application is provided in conjunction with the accompanying drawings. The following implementation is only used to more clearly illustrate the technical solution of the present application, and is therefore only used as an example, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific implementation methods 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the implementation methods of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0046] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment 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.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0052] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery generally also includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0053] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collector and a positive electrode ear connected to the positive current collector, and the positive current collector is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting part and a negative electrode pole ear connected to the negative electrode current collecting part, the negative electrode current collecting part is coated with the negative electrode active material layer, and the negative electrode pole ear is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode pole ears is multiple and stacked together, and the number of negative electrode pole ears is multiple and stacked together. The material of the diaphragm can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited to this.

[0054] The battery cell is usually provided with an electrode terminal and a transition component for connecting the electrode terminal and the tab. The electrode assembly can be electrically connected to the electrode terminal and the external circuit through the transition component to achieve charging and discharging. The inventors have noticed that the connection accuracy between the transition component and the electrode terminal and the electrode assembly has a great impact on the quality of the battery. In the related art, the design of the transition component only considers the connection requirements of the transition component, and less consideration is given to the installation of the transition component, which can easily cause the electrode terminal and the transition component to be unable to align during installation, resulting in misalignment between the transition component and the electrode terminal, which directly affects the amount of current passing through and causes a decrease in battery quality.

[0055] In view of this, an embodiment of the present application provides a technical solution, which facilitates the terminal connecting part to fit onto the electrode terminal by setting a terminal connecting part and a tab connecting part with different heights along the thickness direction, improves the docking accuracy between the terminal connecting part and the electrode terminal, and ensures the quality of the battery.

[0056] Based on the above considerations, the inventor of the present application has designed a switching component, a battery cell, a battery and an electrical device after in-depth research.

[0057] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0058] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0059] FIG1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. As shown in FIG1 , the vehicle 1000 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. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0060] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] In the embodiments of the present application, the battery mentioned refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack.

[0062] FIG2 is a schematic diagram of the structure of a battery 100 provided in some embodiments of the present application. As shown in FIG2, in some embodiments of the present application, the battery 100 includes a box 110, and the box 110 may include a first box portion 111 and a second box portion 112 connected to each other. A plurality of battery cells 10 are connected in parallel or in series or in a mixed combination and are placed in a space formed by connecting the first box portion 111 and the second box portion 112. The shape of the first box portion 111 and the second box portion 112 can be determined according to the shape of the combination of the plurality of battery cells 10. The battery cell 10 may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application. The packaging methods of the battery cell 10 include but are not limited to cylindrical battery cells, square square battery cells and soft-pack battery cells, etc., which are not specifically limited in the embodiments of the present application. In addition, the battery 100 may also include other structures, such as a confluence component, which is used to realize the electrical connection between the plurality of battery cells 10, which will not be described one by one here.

[0063] FIG3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. As shown in FIG3, in some embodiments of the present application, a battery cell is provided, including a housing 120, an electrode terminal 140, an electrode assembly 130, and a transition component 150. The electrode terminal 140 is disposed in the housing 120, and the electrode assembly 130 is accommodated in the housing 120. The transition component 150 is used to connect the electrode terminal 140 and the electrode assembly 130.

[0064] The housing 120 is a component for forming the internal environment of the battery cell, and the formed internal environment can be used to accommodate the electrode assembly 130, the electrolyte (not shown in the figure) and other components. The housing 120 can be in various structural forms, such as a cuboid, a cylinder, etc. Exemplarily, the shape of the housing 120 can be determined according to the specific shape of the electrode assembly 130. The housing 120 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0065] FIG4 is a schematic diagram of the structure of the adapter component 150 and the end cover provided in some embodiments of the present application, and FIG5 is a schematic diagram of the structure of the adapter component 150 provided in some embodiments of the present application. As shown in FIG3 to FIG5, a battery cell adapter component 150 is provided, including a tab connection portion 151, a terminal connection portion 152 and a bending portion 153. The tab connection portion 151 is used to connect the tab 131 of the battery cell, and the terminal connection portion 152 is used to connect the electrode terminal 140 of the battery cell. In the thickness direction of the tab connection portion 151 (the x-axis direction in the figure), the tab connection portion 151 and the terminal connection portion 152 are staggered, and the bending portion 153 connects the tab connection portion 151 and the terminal connection portion 152.

[0066] The electrode terminal 140 is used to connect the electrode assembly 130 in the battery cell and an external power-consuming device to form a complete circuit and realize the charging and discharging process of the battery cell.

[0067] The transition component 150 is used to electrically connect the tab 131 and the electrode terminal 140. Exemplarily, the transition component 150 may be a two-layer stepped structure, a layer close to the electrode terminal 140 is a terminal connection portion 152, a layer close to the tab 131 is a tab connection portion 151, and the bending portion 153 is a portion connecting the two layers. Exemplarily, the angle between the bending portion 153 and the terminal connection portion 152 may be a right angle, an obtuse angle, or an acute angle, and the angle between the bending portion 153 and the tab connection portion 151 may be a right angle, an obtuse angle, or an acute angle.

[0068] By staggering the terminal connection part 152 and the tab connection part 151 , it is easier to connect the terminal connection part 152 with the electrode terminal 140 , thereby improving the docking accuracy between the terminal connection part 152 and the electrode terminal 140 , thereby improving the battery quality.

[0069] Optionally, a plurality of recesses 154 are provided along the thickness direction on the side of the terminal connecting portion 152 away from the electrode terminal 140 . The recesses 154 are used to absorb laser light during laser welding, reduce laser reflection, and reduce the occurrence of cold welds, thereby increasing the connection strength between the terminal connecting section and the electrode terminal 140 .

[0070] Optionally, the electrode assembly 130 further includes a main body, which is located at a side of the transition component 150 away from the electrode terminal 140 , and the electrode tab 131 is led out from an end surface of the main body facing the transition component 150 .

[0071] 3 , optionally, the outer shell may include a shell and an end cover, wherein the shell is a hollow structure with an opening on one side, and the end cover covers the opening of the shell and forms a sealed connection to form an internal environment for accommodating the electrode assembly 130 and the electrolyte, and the end cover is provided with an electrode terminal 140 for drawing out electrical energy, and a transition component 150 is provided between the end cover and the electrode assembly 130.

[0072] Fig. 6 is a schematic diagram of stacking of the transition component 150 provided in some embodiments of the present application. Referring to Fig. 7, the angles between the bending portion 153 and the tab connection portion 151 and between the bending portion 153 and the terminal connection portion 152 are right angles, and in the thickness direction, the size of the bending portion 153 is the same as the thickness of the tab connection portion 151 and the terminal connection portion 152.

[0073] Fig. 7 is another perspective structural diagram of the adapter component 150 provided in some embodiments of the present application. As shown in Fig. 5 and Fig. 7, in some optional embodiments of the present application, the bending portion 153 is inclined from the tab connection portion 151 toward the terminal connection portion 152.

[0074] By tilting the bending portion 153 from the pole lug connection portion 151 toward the terminal connection portion 152, the pole lug connection portion 151 can be relatively far away from the terminal connection portion 152, so that multiple adapter components 150 have a larger avoidance space when stacked, and can accommodate terminal connection portions 152 and pole lug connection portions 151 of different heights in the thickness direction, thereby reducing the position difference between the upper and lower adapter components 150 in the stacking direction and reducing the decrease in connection accuracy between the adapter component 150 and the electrode terminal 140 and / or the pole lug 131 due to the difference in the stacking position of the adapter component 150.

[0075] Fig. 8 is a schematic diagram of stacking of adapter components 150 provided in other embodiments of the present application. Referring to Fig. 8, when multiple adapter components 150 are stacked, if the angles between the bending portion 153 and the pole tab connection portion 151 and between the bending portion 153 and the terminal connection portion 152 are right angles, and in the thickness direction, the size of the bending portion 153 is greater than the thickness of the pole tab connection portion 151 and the terminal connection portion 152, then the upper adapter component 150 will be offset in the W direction in the figure relative to the lower adapter component 150, resulting in an offset in the initial position of the adapter component 150 during installation, which in turn results in a decrease in the docking accuracy between the adapter component 150 and the electrode terminal 140, resulting in a decrease in battery quality.

[0076] Fig. 9 is a schematic diagram of stacking of adapter components 150 provided in some other embodiments of the present application. Referring to Fig. 9, when multiple adapter components 150 are stacked, if the angles between the bending portion 153 and the tab connection portion 151 and between the bending portion 153 and the terminal connection portion 152 are obtuse angles, and there is sufficient avoidance space below the terminal connection portion 152 in the thickness direction to accommodate the previous adapter component 150, the initial position of the adapter component 150 is fixed during installation, the docking error between the adapter component 150 and the electrode terminal 140 is reduced, and the battery quality is improved.

[0077] FIG10 is a partial enlarged schematic diagram of point A in FIG6 . As shown in FIG5 , FIG7 and FIG10 , in some optional embodiments of the present application, the angle between the bending portion 153 and the thickness direction is α, which satisfies 30°≤α≤60°. By limiting the inclination angle of the bending portion 153, on the one hand, it is possible to prevent the inclination angle from being too small, resulting in the bending portion 153 requiring a longer size to obtain sufficient avoidance space, and on the other hand, it is possible to prevent the inclination angle from being too large, resulting in the bending portion 153 being too small in size and not meeting the need for avoidance space.

[0078] Optionally, it satisfies that 35°≤α≤55°, 45°≤α≤50°, 48°≤α≤50°, and 50°≤α≤53°.

[0079] Fig. 11 is another perspective structural schematic diagram of the adapter component 150 provided in some embodiments of the present application. As shown in Fig. 5, Fig. 7 and Fig. 11, in some optional embodiments of the present application, the terminal connection portion 152, the bending portion 153, and the tab connection portion 151 are arranged in sequence along the first direction (y-axis direction in the figure), and the first direction is perpendicular to the thickness direction.

[0080] By arranging the terminal connection portion 152 , the bending portion 153 , and the tab connection portion 151 in sequence along the first direction, the terminal connection portion 152 can be relatively far away from the tab connection portion 151 , thereby reducing mutual interference between the terminal connection portion 152 and the tab connection portion 151 .

[0081] As shown in FIG. 5 , FIG. 7 and FIG. 10 , in some optional embodiments of the present application, the thickness of the terminal connecting portion 152 is D1, the thickness of the tab connecting portion 151 is D2, and the thickness of the bending portion 153 is D3, satisfying D1≤D3≤D2.

[0082] By limiting the thickness relationship among the terminal connection portion 152, the bending portion 153 and the tab connection portion 151, on the one hand, the tab connection portion 151 can be made thicker to facilitate the connection between the tab connection portion 151 and the tab 131, and the terminal connection portion 152 can be made thinner to facilitate the connection between the terminal connection portion 152 and the electrode terminal 140. On the other hand, the bending portion 153 can be made to have the thickest thickness to improve the connection strength between the tab connection portion 151 and the terminal connection portion 152.

[0083] As shown in FIG. 5 , FIG. 7 and FIG. 10 , in some optional embodiments of the present application, the thickness of the terminal connecting portion 152 is D1, the thickness of the tab connecting portion 151 is D2, and the thickness of the bending portion 153 is D3, satisfying 0.3 mm ≤ D1 ≤ D3 ≤ D2 ≤ 3 mm.

[0084] By limiting the thickness of the terminal connection part 152, the bending part 153 and the tab connection part 151, on the one hand, the tab connection part 151 and the terminal connection part 152 can have a certain thickness to meet the connection requirements between the tab connection part 151 and the tab 131 and between the terminal connection part 152 and the electrode terminal 140; on the other hand, it can prevent the thickness of the tab connection part 151, the terminal connection part 152 and the bending part 153 from being too large, occupying the space in the battery and causing the battery energy density to decrease.

[0085] Optionally, it satisfies the following conditions: 0.5mm≤D1≤D3≤D2≤2.5mm, 1mm≤D1≤D3≤D2≤2mm, 1.5mm≤D1≤D3≤D2≤2mm, 1.8mm≤D1≤D3≤D2≤2mm, and 1mm≤D1≤D3≤D2≤1.3mm.

[0086] As shown in Figures 5, 7 and 11, in some optional embodiments of the present application, along the second direction (z-axis direction in the figure), the size of the tab connection portion 151 is larger than the size of the terminal connection portion 152, and the second direction is perpendicular to the first direction and the thickness direction.

[0087] By reducing the size of the terminal connection portion 152 in the second direction, a larger redundant space can be provided in the second direction when the adapter component 150 is installed, thereby facilitating adjustment of the relative position between the terminal connection portion 152 and the electrode terminal 140 and improving installation accuracy.

[0088] As shown in FIG. 5 , FIG. 7 and FIG. 11 , in some optional embodiments of the present application, along the second direction, the size of the terminal connecting portion 152 is D4, and the size of the tab connecting portion 151 is D5, satisfying 0<D5-D4≤0.5mm.

[0089] By limiting the widths of the terminal connection portion 152 and the tab connection portion 151 in the second direction, on the one hand, redundancy of the terminal connection portion 152 in the second direction can be achieved; on the other hand, it can prevent the width of the terminal connection portion 152 in the second direction from being too small, thereby affecting the connection between the terminal connection portion 152 and the electrode terminal 140.

[0090] Optionally, it satisfies the following conditions: 0.1mm≤D5-D4≤0.5mm, 0.2mm≤D5-D4≤0.4mm, 0.25mm≤D5-D4≤0.3mm, and 0.3mm≤D5-D4≤0.35mm.

[0091] As shown in Figures 5, 7, 9 and 10, in some optional embodiments of the present application, the pole ear connection portion 151 includes a first surface 155 close to the pole ear 131 and a second surface 156 away from the pole ear 131, and the terminal connection portion 152 includes a third surface 157 close to the electrode terminal 140 and a fourth surface 158 away from the electrode terminal 140. Along the thickness direction, the size from the first surface 155 to the fourth surface 158 is H1, satisfying H1≥D2, and / or, along the thickness direction, the size from the second surface 156 to the third surface 157 is H2, satisfying H2≥D1.

[0092] By limiting the distances among the first surface 155, the second surface 156, the third surface 157 and the fourth surface 158, when the adapter components 150 are stacked, the tab connection portion 151 of the preceding adapter component 150 in the thickness direction can be higher than the terminal connection portion 152 of the succeeding adapter component 150, thereby forming a stacking space for facilitating the placement of the succeeding adapter component 150; or when the adapter components 150 are stacked, the terminal connection portion 152 of the preceding adapter component 150 in the thickness direction can be higher than the tab connection portion 151 of the succeeding adapter component 150, thereby forming a stacking space for facilitating the placement of the succeeding adapter component 150.

[0093] In some optional embodiments of the present application, a battery cell is provided, including a housing, an electrode terminal 140, an electrode assembly 130 and the above-mentioned adapter 150. The housing is provided with a receiving cavity, the electrode terminal 140 is provided in the housing, the electrode assembly 130 is received in the receiving cavity, and the adapter 150 is used to connect the electrode terminal 140 and the electrode assembly 130.

[0094] In some optional embodiments of the present application, a battery is provided, comprising the above-mentioned battery cell.

[0095] In some optional embodiments of the present application, an electrical device is provided, comprising the above-mentioned battery cell, and the battery cell is used to provide electrical energy.

[0096] In some optional embodiments of the present application, a transition component 150 of a battery cell is provided, comprising a tab connection portion 151, a terminal connection portion 152, and a bending portion 153. The tab connection portion 151 is used to connect the tab 131 of the battery cell, the terminal connection portion 152 is used to connect the electrode terminal 140 of the battery cell, in the thickness direction of the tab connection portion 151, the terminal connection portion 152 is staggered with the tab connection portion 151, the bending portion 153 connects the tab connection portion 151 and the terminal connection portion 152, the bending portion 153 is inclined from the tab connection portion 151 toward the terminal connection portion 152, and the angle between the bending portion 153 and the thickness direction is α, which satisfies 43°≤α≤48°. The terminal connection part 152, the bending part 153, and the tab connection part 151 are arranged in sequence along the first direction, the first direction is perpendicular to the thickness direction, the thickness of the terminal connection part 152 is D1, the thickness of the tab connection part 151 is D2, and the thickness of the bending part 153 is D3, satisfying that D1≤D3≤D2. The thickness of the terminal connection part 152 is D1, the thickness of the tab connection part 151 is D2, and the thickness of the bending part 153 is D3, satisfying that 1mm≤D1≤D3≤D2≤3mm. Along the second direction, the size of the tab connection part 151 is larger than the size of the terminal connection part 152, the second direction is perpendicular to the first direction and the thickness direction, and along the second direction, the size of the terminal connection part 152 is D4, and the size of the tab connection part 151 is D5, satisfying that 0.3mm≤D5-D4≤0.5mm. The pole ear connection portion 151 includes a first surface 155 on a side close to the pole ear 131 and a second surface 156 on a side away from the pole ear 131, and the terminal connection portion 152 includes a third surface 157 on a side close to the electrode terminal 140 and a fourth surface 158 on a side away from the electrode terminal 140. Along the thickness direction, the size from the first surface 155 to the fourth surface 158 is H1, satisfying H1≥D2, and / or, along the thickness direction, the size from the second surface 156 to the third surface 157 is H2, satisfying H2≥D1.

[0097] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A switching component of a battery cell, comprising: A tab connection portion, used to connect the tab of a battery cell; a terminal connection portion, used to connect the electrode terminal of the battery cell, wherein the tab connection portion and the terminal connection portion are offset in the thickness direction of the tab connection portion; and a bending portion, connecting the tab connection portion and the terminal connection portion. The adapter component according to claim 1, wherein: The bent portion is inclined from the tab connecting portion toward the terminal connecting portion. The adapter component according to claim 2, wherein: The angle between the bending portion and the thickness direction is α, which satisfies 30°≤α≤60°. The adapter component according to any one of claims 1 to 3, wherein: The terminal connecting portion, the bending portion, and the tab connecting portion are arranged in sequence along a first direction, and the first direction is perpendicular to the thickness direction. The adapter component according to any one of claims 1 to 4, wherein: The thickness of the terminal connecting portion is D1, the thickness of the tab connecting portion is D2, and the thickness of the bending portion is D3, satisfying D1≤D3≤D2. The adapter component according to claim 5, wherein: The thickness of the terminal connecting portion is D1, the thickness of the tab connecting portion is D2, and the thickness of the bending portion is D3, satisfying 0.3 mm ≤ D1 ≤ D3 ≤ D2 ≤ 3 mm. The adapter component according to claim 4, wherein: Along the second direction, the size of the tab connection portion is greater than the size of the terminal connection portion, and the second direction is perpendicular to the first direction and the thickness direction. The adapter component according to claim 7, wherein: Along the second direction, the dimension of the terminal connection portion is D4, and the dimension of the tab connection portion is D5, satisfying 0<D5-D4≤0.5mm. The adapter component according to any one of claims 5 to 8, wherein: The pole lug connection portion includes a first surface close to the pole lug side and a second surface away from the pole lug side, and the terminal connection portion includes a third surface close to the electrode terminal side and a fourth surface away from the electrode terminal side. Along the thickness direction, the size from the first surface to the fourth surface is H1, satisfying H1≥D2, and / or, along the thickness direction, the size from the second surface to the third surface is H2, satisfying H2≥D1. A battery cell, comprising: A housing is provided with a receiving cavity; An electrode terminal, disposed on the housing; An electrode assembly is accommodated in the accommodating cavity; and a transition component as described in any one of claims 1 to 9 is used to connect the electrode terminal and the electrode assembly. A battery comprising the battery cell as claimed in claim 10. An electrical device comprises the battery cell as claimed in claim 10, wherein the battery cell is used to provide electrical energy.

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