Battery cell, battery, electrical equipment, and manufacturing method and equipment of battery cell

Abstract

The present application relates to a battery cell, a battery, an electrical device, and a manufacturing method and device for a battery cell. The battery cell includes: an electrode assembly, including a first pole ear and a second pole ear with opposite polarities, the first pole ear and the second pole ear are respectively located at the two ends of the electrode assembly, and the electrode assembly has a winding center hole; a shell assembly, including a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the electrode assembly is arranged inside the shell assembly, the first electrode lead-out portion and the second electrode lead-out portion are both arranged on one side of the shell assembly close to the first pole ear, the first electrode lead-out portion is electrically connected to the first pole ear, and the second electrode lead-out portion is provided with an injection hole for injecting electrolyte into the battery cell; an adapter, the adapter is tubular and penetrates the winding center hole, one end of the adapter is connected to the second pole ear, the other end of the adapter extends into the injection hole and the outer peripheral surface is connected to the inner peripheral surface of the injection hole, so as to realize the electrical connection between the second pole ear and the second electrode lead-out portion.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery cell, a battery, an electrical device, and a manufacturing method and device for the battery cell. Background Art

[0002] In the general environment of pursuing energy conservation and emission reduction, batteries are widely used in electrical devices. With the development of technology, higher requirements are put forward for the structure of batteries. The structure of batteries tends to develop in a more compact direction to reduce the space occupied by them in electrical devices. However, the reduction of space easily leads to safety problems such as component overlap short circuits and problems that are not conducive to assembly. Summary of the Invention

[0003] The present application aims to provide a battery cell, a battery, an electrical device, and a manufacturing method and device for the battery cell, so as to make the battery structure more compact and convenient for assembly, and at the same time improve the safety of the battery.

[0004] The embodiments of the present application are implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes:

[0006] An electrode assembly, including a first tab and a second tab with opposite polarities. The first tab and the second tab are respectively located at both ends of the electrode assembly, and the electrode assembly has a winding center hole;

[0007] A housing assembly, including a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy. The electrode assembly is disposed inside the housing assembly. The first electrode lead-out portion and the second electrode lead-out portion are both disposed on one side of the housing assembly close to the first tab. The first electrode lead-out portion is electrically connected to the first tab, and the second electrode lead-out portion is provided with a liquid injection hole for injecting electrolyte into the battery cell;

[0008] An adapter, the adapter is tubular and penetrates through the winding center hole. One end of the adapter is connected to the second tab, and the other end of the adapter extends into the liquid injection hole and the outer peripheral surface thereof is connected to the inner peripheral surface of the liquid injection hole to realize the electrical connection between the second tab and the second electrode lead-out portion.

[0009] The battery cell provided by the present application, under the overall arrangement of the housing assembly, the electrode assembly and the adapter, has a relatively large distance between its first tab and second tab, making it not easy for them to overlap with each other and cause a short circuit, thus having relatively high safety. The current collecting component connects the first electrode lead-out part and the second electrode lead-out part on the same side of the battery cell, making the structure of the battery more compact. Moreover, through the second electrode lead-out part and the adapter, liquid injection and open-circuit formation are realized, without additionally arranging a liquid injection hole on the housing assembly, further simplifying the structure of the battery cell. Additionally, the end of the adapter extends into the liquid injection hole, avoiding the limitation of the internal space of the housing assembly on the adapter. The connection between the adapter and the second electrode lead-out part is not affected by the length of the adapter, reducing the manufacturing precision requirements of the adapter, making it more convenient for production, manufacturing and assembly. Furthermore, the connection between the adapter and the second electrode lead-out part is realized in a state visible from the outside, improving the connection quality between the adapter and the second electrode lead-out part, with high connection strength and good over-current capacity.

[0010] In an embodiment of the present application, the outer peripheral surface of the end of the adapter extending into the liquid injection hole is welded to the inner peripheral surface of the liquid injection hole.

[0011] In the above technical solution, the adapter and the second electrode lead-out part can be connected in a state visible from the outside, with a fast processing speed, and can reduce the phenomenon of false soldering, ensuring the welding quality, making the connection between the adapter and the second electrode lead-out part stable and having good over-current capacity.

[0012] In an embodiment of the present application, the outer peripheral surface of the end of the adapter extending into the liquid injection hole is a first conical surface, and the inner peripheral surface of the liquid injection hole includes a second conical surface matching the first conical surface.

[0013] In the above technical solution, through the cooperation of the first conical surface and the second conical surface, it plays a role in guiding the centering of the adapter and ensures the fitting of the outer peripheral surface of the adapter and the inner peripheral surface of the liquid injection hole, avoiding the problem of false soldering.

[0014] In an embodiment of the present application, in the direction away from the inside of the battery cell, the diameter of the first conical surface gradually decreases.

[0015] In the above technical solution, the first conical surface and the second conical surface may have their larger ends facing the inside of the battery cell and their smaller ends facing the outside of the battery cell. On the one hand, it is convenient to first connect the adapter to the electrode assembly, and then, after entering the housing together with the electrode assembly, extend into the liquid injection hole and complete the connection. On the other hand, due to manufacturing errors, the outer peripheral surfaces of the extending ends of the adapter may not be of equal height. By setting the outer peripheral surface of the adapter as the first conical surface that gradually decreases in the direction away from the inside of the battery cell, when the first conical surface and the second conical surface are pressed tightly during assembly, the higher position of the outer peripheral surface can exceed the liquid injection hole, ensuring that the lower position of the outer peripheral surface is flush with the end edge of the liquid injection hole, and avoiding virtual soldering. That is, through the above settings, first connect the end of the adapter hidden inside the battery cell, and then connect the other visible end outside the adapter, ensuring stable connection between the second electrode lead-out part and the second tab, and also improving the welding yield rate of the adapter and the liquid injection hole.

[0016] In an embodiment of the present application, the battery cell further includes a seal, and the seal is used to seal the liquid injection hole, and the seal is disposed opposite to the end of the adapter extending into the liquid injection hole.

[0017] In the above technical solution, the seal covers the liquid injection hole and the end of the adapter to prevent electrolyte leakage.

[0018] In an embodiment of the present application, the liquid injection hole includes a first hole section and a second hole section. The second hole section is closer to the inside of the battery cell than the first hole section. The aperture of the second hole section is smaller than that of the first hole section. The outer peripheral surface of the adapter is connected to the inner peripheral surface of the second hole section, and the seal is disposed in the first hole section.

[0019] In the above technical solution, the connection interface between the adapter and the second hole section is located between the axis and the inner wall of the first hole section. The first hole section provides a larger space for welding operations, facilitating welding. At the same time, it also enables the connection interface between the adapter and the second hole section and the channel on the adapter to be covered by the seal, ensuring a good sealing effect.

[0020] In an embodiment of the present application, the battery cell further includes a current collector, and the current collector is attached to the second tab and is used to connect the second tab and the adapter to achieve electrical connection between the second tab and the adapter.

[0021] In the above technical solution, by setting the current collector, a larger area of the second tab is directly connected to the current collector, improving the connection strength and the current-carrying area, and enabling the battery cell to have a higher current-carrying capacity.

[0022] In an embodiment of the present application, the current collector covers one end of the electrode assembly having the second tab, one end of the adapter away from the liquid injection hole is connected to the current collector, a first through hole is formed in the current collector, and the position of the first through hole corresponds to the internal space of the adapter.

[0023] In the above technical solution, on the one hand, the current collector covers both sides of the winding center hole of the electrode assembly, and the contact area between the current collector and the second tab is relatively large, ensuring that the second tabs on both sides of the winding center hole can conduct current through the current collector, so as to avoid polarization problems and further improve the current-carrying capacity. On the other hand, by providing the first through hole penetrating the current collector and communicating with the internal space of the tubular adapter, the electrolyte can flow to the other end of the battery cell, realizing the rapid filling of the internal part of the outer shell assembly with electrolyte from bottom to top, and improving the wetting effect and wetting rate of the electrolyte.

[0024] In an embodiment of the present application, the current collector is formed with a plurality of second through holes, and the positions of the second through holes are offset from the internal space of the adapter.

[0025] In the above technical solution, the electrolyte flows from the second through holes to the end of the electrode assembly. In this direction, the resistance of the electrolyte is small, and it can quickly enter the gaps between the electrode plates, improving the wetting rate and wetting effect of the electrolyte inside the electrode assembly.

[0026] In an embodiment of the present application, a first groove is formed on the surface of the current collector facing the second tab, and both ends of the first groove extend to the edge of the current collector respectively, and the first through hole is arranged on the bottom wall of the groove.

[0027] In the above technical solution, the first groove connects the central area and the edge area of the current collector, thereby forming a channel for the electrolyte to flow between the current collector and the electrode assembly, and the first groove passes through the gap between any two adjacent electrode plates of the electrode assembly, ensuring the wetting effect and wetting rate of the electrolyte.

[0028] In an embodiment of the present application, a second groove is formed on the surface of the current collector facing away from the second tab, and the bottom wall of the second groove is welded to the second tab.

[0029] In the above technical solution, by providing the second groove on the surface of the current collector facing away from the second tab, the second groove marks the welding area for easy welding.

[0030] In an embodiment of the present application, a protrusion is formed on the surface of the current collector facing the second tab, and the protrusion is opposite to the second groove.

[0031] In the above technical solution, the protrusion can be embedded into the second tab to ensure full contact between the protrusion and the second tab. At the same time, the position of the second groove corresponds to that of the protrusion, avoiding the occurrence of a gap between the second groove and the second tab during welding, so as to avoid the problem of false soldering.

[0032] In a second aspect, an embodiment of the present application provides a battery, which includes the aforementioned battery cell.

[0033] For the battery provided by the present application, its current collecting component only needs to occupy one side in the height direction of the battery cell. The overall structure of the battery is compact, and the battery has good safety and is convenient for assembly.

[0034] In a third aspect, an embodiment of the present application provides an electrical device, which includes the aforementioned battery.

[0035] For the electrical device provided by the present application, its battery occupies a small space, has good safety, and is convenient for assembly, which is conducive to the miniaturization development of the electrical device.

[0036] In a fourth aspect, an embodiment of the present application provides a manufacturing method for a battery cell, which includes:

[0037] Providing an electrode assembly, the electrode assembly includes a first tab and a second tab with opposite polarities. The first tab and the second tab are respectively located at both ends of the electrode assembly, and the electrode assembly has a winding center hole; providing a housing assembly, the housing assembly includes a first electrode lead-out part and a second electrode lead-out part for inputting or outputting electric energy. The first electrode lead-out part and the second electrode lead-out part are both arranged on the same side of the housing assembly. The second electrode lead-out part is provided with a liquid injection hole for injecting electrolyte into the battery cell; providing an adapter, the adapter is tubular; passing the adapter through the winding center hole and connecting one end of the adapter to the second tab; placing the adapter and the electrode assembly into the housing assembly, so that the first electrode lead-out part and the second electrode lead-out part are both arranged on the side of the housing assembly close to the first tab, electrically connecting the first tab to the first electrode lead-out part, and extending the other end of the adapter into the liquid injection hole and connecting the outer peripheral surface of the adapter to the inner peripheral surface of the liquid injection hole to realize the electrical connection between the second tab and the second electrode lead-out part.

[0038] In a fifth aspect, an embodiment of the present application provides a manufacturing device for a battery cell, which includes:

[0039] A first providing device for providing an electrode assembly, the electrode assembly including a first tab and a second tab with opposite polarities, the first tab and the second tab being located at two ends of the electrode assembly respectively, and the electrode assembly having a winding central hole; a second providing device for providing a housing assembly, the housing assembly including a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the first electrode lead-out portion and the second electrode lead-out portion both being provided on the same side of the housing assembly, and the second electrode lead-out portion being provided with a liquid injection hole for injecting electrolyte into the battery cell; a third providing device for providing an adapter, the adapter being tubular; a first assembling device for passing the adapter through the winding central hole and connecting one end of the adapter to the second tab; a second assembling device for placing the adapter and the electrode assembly into the housing assembly, so that both the first electrode lead-out portion and the second electrode lead-out portion are located on the side of the housing assembly close to the first tab, electrically connecting the first tab to the first electrode lead-out portion, and extending the other end of the adapter into the liquid injection hole and connecting the outer peripheral surface of the adapter to the inner peripheral surface of the liquid injection hole to achieve electrical connection between the second tab and the second electrode lead-out portion. Description of the Drawings

[0040] 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 some embodiments of the present application, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0041] Figure 1 Schematic diagram of a vehicle provided in an embodiment of the present application;

[0042] Figure 2 Exploded view of a battery provided in an embodiment of the present application;

[0043] Figure 3 Exploded view of a battery cell provided in an embodiment of the present application;

[0044] Figure 4 Front view of a battery cell provided in an embodiment of the present application;

[0045] Figure 5 Cross-sectional view of a battery cell provided in an embodiment of the present application;

[0046] Figure 6 Partial enlarged view of a second electrode lead-out portion and an adapter provided in an embodiment of the present application;

[0047] Figure 7Partial enlarged view of the second electrode lead-out part and the adapter provided in an embodiment of the present application;

[0048] Figure 8 Schematic diagram of the welding state of a battery cell provided in an embodiment of the present application;

[0049] Figure 9 Exploded view of the adapter, the second electrode lead-out part and the seal provided in an embodiment of the present application;

[0050] Figure 10 Partial enlarged view of the adapter, the current collector and the second tab provided in an embodiment of the present application;

[0051] Figure 11 Stereogram of the adapter and the current collector provided in an embodiment of the present application;

[0052] Figure 12 Schematic diagram of the side of the current collector facing away from the electrode assembly provided in an embodiment of the present application;

[0053] Figure 13 Schematic flow chart of the manufacturing method of a battery cell provided in an embodiment of the present application;

[0054] Figure 14 Schematic block diagram of the manufacturing equipment of a battery cell provided in an embodiment of the present application.

[0055] Icons: 1000 - vehicle; 100 - battery; 200 - motor; 300 - controller; 101 - box body; 1011 - first box body part; 1012 - second box body part; 102 - battery cell; 1 - electrode assembly; 11 - first tab; 12 - second tab; 13 - winding center hole; 2 - housing assembly; 21 - first electrode lead-out part; 22 - second electrode lead-out part; 221 - liquid injection hole; 221a - first hole section; 221b - second hole section; 2211 - inner peripheral surface; 23 - bottom wall; 24 - side wall; 25 - end cover; 26 - seal; 3 - adapter; 31 - outer peripheral surface; 4 - current collector; 41 - first through hole; 42 - second through hole; 43 - first groove; 44 - second groove; 51 - first insulating part; 52 - second insulating part; 6 - first adapter; 7 - manufacturing equipment; 71 - first providing device; 72 - second providing device; 73 - third providing device; 74 - first assembling device; 75 - second assembling device; L - laser. Detailed implementation manners

[0056] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above accompanying drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0058] Referring to "embodiments" in this application means that specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0059] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0060] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0061] In the embodiments of this application, the same reference numerals represent the same components. And for the sake of simplicity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thicknesses, lengths, widths and other dimensions of various components shown in the accompanying drawings in the embodiments of this application, as well as the overall thickness, length, width and other dimensions of the integrated device are only for illustrative purposes and should not constitute any limitation to this application.

[0062] In this application, "a plurality of" means two or more (including two).

[0063] In this 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, a magnesium-ion battery cell, etc., and the embodiments of this application do not limit this.

[0064] The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. Generally, the battery includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0065] The battery cell includes an electrode assembly and an electrolyte (such as an electrolyte solution). The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate 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 collecting portion and a positive electrode tab protruding from the positive current collecting portion. The positive current collecting portion is coated with a positive active material layer, and at least part of the positive electrode tab is not coated with the 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 cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collecting portion and a negative electrode tab protruding from the negative current collecting portion. The negative current collecting portion is coated with a negative active material layer, and at least part of the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0066] The battery cell also includes a housing assembly. An accommodation space is formed inside the housing assembly for accommodating the electrode assembly, the electrolyte, and other functional components to realize an electrochemical reaction in the accommodation space. The housing assembly also includes electrode lead-out portions, which include a positive electrode lead-out portion and a negative electrode lead-out portion. The positive electrode lead-out portion is connected to the positive electrode tab, and the negative electrode lead-out portion is connected to the negative electrode tab to realize the electrical energy output or input of the battery cell.

[0067] The outer shell assembly also needs to be provided with a closable liquid injection hole for injecting electrolyte into the accommodation space after other functional components such as the electrode assembly are installed. Before leaving the factory, the battery cell also needs to undergo the first charge and discharge formation. During formation, gas will be generated. The liquid injection hole can also be used to discharge the gas after formation to reduce the internal pressure of the battery cell (i.e., open formation) and ensure safety.

[0068] In the battery, there is also a busbar component for connecting the electrode lead-out parts of the battery cells. Multiple battery cells are connected in parallel, in series, or in a hybrid connection through the busbar component.

[0069] In the context of the pursuit of energy conservation and emission reduction, batteries are widely used in electrical equipment. With the development of technology, higher requirements are put forward for the structure of the battery. The structure of the battery tends to develop in a more compact direction to reduce the space occupied in the electrical equipment.

[0070] In the battery, the battery cell and the busbar component connected to the battery cell occupy most of the space. How to reduce the space occupied while realizing the necessary functions and avoid the problems that the components inside the battery cell are not convenient to connect and are prone to lap short circuit due to the reduction of space is one of the important research and development directions in this field.

[0071] On this basis, to reduce the space occupied and facilitate the assembly of the battery cell while ensuring safety, the present application provides a solution. The electrode assembly has a winding center hole. The two ends of the electrode assembly are respectively provided with a first tab and a second tab with opposite polarities. The outer shell assembly includes a first electrode lead-out part and a second electrode lead-out part both arranged on the side close to the first tab. Among them, the first electrode lead-out part is electrically connected to the first tab, and the second electrode lead-out part is provided with a liquid injection hole for injecting electrolyte into the battery cell; the battery cell also includes an adapter. The adapter is tubular and passes through the winding center hole. One end of the adapter is connected to the second tab, and the other end of the adapter extends into the liquid injection hole and the outer peripheral surface is connected to the inner peripheral surface of the liquid injection hole to realize the electrical connection between the second tab and the second electrode lead-out part.

[0072] On the one hand, by arranging the first electrode lead-out part and the second electrode lead-out part with opposite polarities on the same side of the outer shell assembly, and setting the first tab and the second tab at both ends of the electrode assembly, and the adapter cooperating with the outer shell assembly, the first tab and the second tab are far apart, and it is not easy for the first tab and the second tab to lap each other and cause a short circuit when they are deformed. The safety of the battery cell is relatively high, and the input and output of electric energy are realized on the same side of the battery cell, so as to facilitate the connection of the busbar component on the same side of the battery cell, reduce the space occupied, and make the structure of the battery more compact.

[0073] On the other hand, liquid injection and open-circuit formation are achieved through the second electrode lead-out part and the adapter, without the need to separately provide a liquid injection hole on the housing assembly, further simplifying the structure of the battery cell. Moreover, the end of the adapter extends into the liquid injection hole, avoiding the limitation of the internal space of the housing assembly on the adapter, and preventing problems such as the inability to connect the second electrode lead-out part due to a short adapter length or the inability to assemble the adapter within the housing assembly due to a long adapter length. The connection between the adapter and the second electrode lead-out part is not affected by the length of the adapter, reducing the manufacturing precision requirements for the adapter, making production, manufacturing, and assembly more convenient. Additionally, the connection between the adapter and the second electrode lead-out part can be achieved in a state visible from the outside, improving the connection quality, with high connection strength and good over-current capacity.

[0074] In summary, the battery cell provided in this application, with the overall arrangement of the housing assembly, electrode assembly, and adapter, not only has high safety and a compact structure but also can achieve liquid injection, open-circuit formation, is convenient to assemble, and has good over-current capacity.

[0075] For the convenience of description, the following embodiments take the electrical equipment as a vehicle as an example.

[0076] As Figure 1 shown, Figure 1 FIG. 13 shows a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100, a controller 300, and a motor 200 can be arranged inside the vehicle 1000, and the controller 300 is used to control the power supply of the battery 100 to the motor 200. For example, the battery 100 can be arranged at the bottom, front end, or rear end of the vehicle 1000. The battery 100 can be used for the power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000 for the circuit system of the vehicle 1000, such as for the working power requirements during the start-up, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000 but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] To meet different power usage requirements, as Figure 2As shown, the battery 100 may include a plurality of battery cells 102, among which the plurality of battery cells 102 may be connected in series, in parallel, or in a combined series-parallel connection. The combined series-parallel connection refers to a combination of series and parallel connections. The battery 100 may also be referred to as a battery 100 pack. Optionally, the plurality of battery cells 102 may first be connected in series, in parallel, or in a combined series-parallel connection to form battery modules, and then the plurality of battery modules may be connected in series, in parallel, or in a combined series-parallel connection to form the battery 100. That is to say, the plurality of battery cells 102 may directly form the battery 100, or may first form battery modules, and then the battery modules form the battery 100.

[0078] The battery 100 may further include a box body 101 (or a cover body), and an accommodation space is formed inside the box body 101, and the plurality of battery cells 102 are accommodated in the box body 101. The box body 101 may include two parts for accommodation (which can be referred to Figure 2 ), and are respectively referred to as the first box body part 1011 and the second box body part 1012 here, and the first box body part 1011 and the second box body part 1012 are snapped together. The shapes of the first box body part 1011 and the second box body part 1012 may be determined according to the shape of the combination of the plurality of battery cells 102, and the first box body part 1011 and the second box body part 1012 may each have an opening. For example, both the first box body part 1011 and the second box body part 1012 may be hollow cuboids and each has only one face as an opening surface, the openings of the first box body part 1011 and the second box body part 1012 are arranged oppositely, and the first box body part 1011 and the second box body part 1012 are snapped together to form the box body 101 with a closed chamber. Among the first box body part 1011 and the second box body part 1012, one may be a cuboid with an opening, and the other may be a cover plate structure to close the opening of the cuboid. After the plurality of battery cells 102 are connected in parallel, in series, or in a combined series-parallel connection, they are placed inside the box body 101 formed by snapping the first box body part 1011 and the second box body part 1012 together.

[0079] Optionally, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component (not shown in the figure), and the busbar component is used to achieve electrical connection between the plurality of battery cells 102, such as in parallel, in series, or in a combined series-parallel connection. Specifically, the busbar component may achieve electrical connection between the battery cells 102 by connecting the electrode terminals of the battery cells 102. Further, the busbar component may be fixed to the electrode terminals of the battery cells 102 by welding. The electrical energy of the plurality of battery cells 102 may be further led out through a conductive mechanism passing through the box body 101. Optionally, the conductive mechanism may also belong to the busbar component.

[0080] The following will be described in detail for any one of the battery cells 102, such as Figure 3 、 Figure 4 and Figure 5As shown, the battery cell 102 includes an electrode assembly 1, a shell assembly 2 and an adapter 3. The electrode assembly 1 includes a first pole ear 11 and a second pole ear 12 with opposite polarities, the first pole ear 11 and the second pole ear 12 are respectively located at the two ends of the electrode assembly 1, and the electrode assembly 1 has a winding center hole 13. The shell assembly 2 includes a first electrode lead-out portion 21 and a second electrode lead-out portion 22 for inputting or outputting electric energy, and the electrode assembly 1 is provided inside the shell assembly 2. The first electrode lead-out portion 21 and the second electrode lead-out portion 22 are both provided on a side of the shell assembly 2 close to the first pole ear 11, the first electrode lead-out portion 21 is electrically connected to the first pole ear 11, and the second electrode lead-out portion 22 is provided with an injection hole 221 for injecting electrolyte into the battery cell 102. The adapter 3 is tubular and passes through the winding center hole 13. One end of the adapter 3 is connected to the second pole ear 12. The other end of the adapter 3 extends into the injection hole 221 and the outer peripheral surface 31 is connected to the inner peripheral surface 2211 of the injection hole 221 to achieve electrical connection between the second pole ear 12 and the second electrode lead-out portion 22.

[0081] The electrode assembly 1 includes a first electrode sheet, a second electrode sheet and a separator, and the separator is used to separate the first electrode sheet from the second electrode sheet. The polarities of the first electrode sheet and the second electrode sheet are opposite. In other words, one of the first electrode sheet and the second electrode sheet is a positive electrode sheet, and the other of the first electrode sheet and the second electrode sheet is a negative electrode sheet. The first electrode sheet, the second electrode sheet and the separator are prior art. Although not shown in the drawings of the present application specification, those skilled in the art should understand their specific structures. The first pole ear 11 is the portion of the first pole sheet that is not coated with the active material layer, and the second pole ear 12 is the portion of the second pole sheet that is not coated with the active material layer. In other words, one of the first pole ear 11 and the second pole ear 12 is the positive pole ear, and the other of the first pole ear 11 and the second pole ear 12 is the negative pole ear. As Figure 3 As shown, in the present application, the electrode assembly 1 is a winding structure having a winding center hole 13 , and the first electrode tab 11 and the second electrode tab 12 are respectively located at two ends of the electrode assembly 1 along the extension direction of the winding center hole 13 .

[0082] The interior of the housing component 2 forms a space for accommodating the electrode component 1. The shape of the housing component 2 can be determined according to the specific shape of the electrode component 1. For example, if the electrode component 1 is a cylindrical structure, the housing component 2 can be selected as a cylinder; if the electrode component 1 is a rectangular parallelepiped structure, the housing component 2 can be selected as a rectangular parallelepiped. Optionally, both the electrode component 1 and the housing component 2 are cylindrical.

[0083] The housing assembly 2 includes a bottom wall 23, a side wall 24, and an end cap 25. The side wall 24 surrounds the bottom wall 23. One end of the side wall 24 is connected to the bottom wall 23, and the other end of the side wall 24 forms an opening opposite to the bottom wall 23, and the end cap 25 covers the opening. The bottom wall 23 and the side wall 24 can be integrally formed into a shell with an opening; they can also be independent components, which are connected after being formed to form a shell with an opening. The end cap 25 and the shell can be independent components, which are covered and connected after being formed; or the end cap 25 and the shell can be integrated. Specifically, the end cap 25 and the shell can form a common connection surface before other components are inserted into the shell, and when the interior of the shell needs to be encapsulated, the end cap 25 is then covered on the shell. The connection method between the shell and the end cap 25 can be welding, roll pressing and caulking, etc. In this embodiment, the roll pressing and caulking connection method is selected. The materials of the bottom wall 23, the side wall 24, and the end cap 25 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this. Exemplarily, in the embodiments of the present application, the bottom wall 23, the side wall 24, and the end cap 25 are made of stainless steel.

[0084] The first electrode lead-out portion 21 and the second electrode lead-out portion 22 are both arranged on the bottom wall 23 or the end cap 25. Exemplarily, the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are arranged on the end cap 25. The edge of the end cap 25 is connected to the side wall 24 of the shell, and the portion between the edge and the central portion of the end cap 25 is used as the first electrode lead-out portion 21; the second electrode lead-out portion 22 is an electrode terminal insulatedly installed at the central portion of the end cap 25, and the liquid injection hole 221 penetrates through the electrode terminal along the thickness direction of the end cap 25.

[0085] The connection method between the first electrode lead-out portion 21 and the first pole ear 11 can be direct connection or indirect connection to achieve electrical conduction. The direct connection between the electrode lead-out portion and the first pole ear 11 includes: direct contact conduction, bonding through a conductive adhesive, or welding. The indirect connection between the first electrode lead-out portion 21 and the first pole ear 11 means connection through other conductive components. Exemplarily, as Figure 5 and Figure 6 shown, the battery cell 102 further includes another adapter 3 (hereinafter referred to as the first adapter 6 for easy distinction). The first adapter 6 covers the first pole ear 11 of the electrode assembly 1. The connection method between the first pole ear 11 and the first adapter 6 can be contact conduction, bonding through a conductive adhesive, or welding. The connection method between the first adapter 6 and the first electrode lead-out portion 21 can be contact conduction, bonding through a conductive adhesive, or welding. In this embodiment, exemplarily, the first adapter 6 is welded to the first pole ear 11 and welded to the first electrode lead-out portion 21.

[0086] The adapter 3 is a component for conducting current. As Figure 5 and Figure 6As shown, the adapter 3 is a tubular structure made of a conductive material. Exemplarily, the adapter 3 is a metal tube. One end of the adapter 3 is connected to the second tab 12, and the other end extends into the liquid injection hole 221 of the second electrode lead-out part 22. The connection method between the adapter 3 and the second tab 12 can be conductive contact, bonding with a conductive adhesive, or welding. The connection method between the adapter 3 and the second electrode lead-out part 22 can be conductive contact, bonding with a conductive adhesive, or welding. That is, the outer peripheral surface 31 of the end of the adapter 3 extending into the liquid injection hole 221 is connected to the inner peripheral surface 2211 of the liquid injection hole 221. A channel for the electrolyte to flow is formed in the center of the tubular adapter 3. When the adapter 3 extends into the liquid injection hole 221 of the second electrode lead-out part 22, the adapter 3 can be used for injecting the electrolyte.

[0087] For the battery cell 102 provided in the embodiment of the present application, under the overall arrangement of the housing assembly 2, the electrode assembly 1, and the adapter 3, the first tab 11 and the second tab 12 are far apart and are not easily overlapped with each other to cause a short circuit, so the safety is relatively high; the bus bar component connects the first electrode lead-out part 21 and the second electrode lead-out part 22 on the same side of the battery cell 102, making the structure of the battery 100 more compact; and liquid injection and open-circuit formation are realized through the second electrode lead-out part 22 and the adapter 3, without additionally providing a liquid injection hole 221 on the housing assembly 2, further simplifying the structure of the battery cell 102; moreover, the end of the adapter 3 extends into the liquid injection hole 221, avoiding the limitation of the internal space of the housing assembly 2 on the adapter 3, and there will be no problem that the length of the adapter 3 is too small to connect to the second electrode lead-out part 22, nor will there be a problem that the length of the adapter 3 is too large to be assembled in the housing assembly 2. The connection between the adapter 3 and the second electrode lead-out part 22 is not affected by the length of the adapter 3, the manufacturing precision requirements of the adapter 3 are reduced, it is more convenient for production, manufacturing, and assembly, and the connection between the adapter 3 and the second electrode lead-out part 22 is realized in a visible state externally, improving the connection quality between the adapter 3 and the second electrode lead-out part 22, with high connection strength and good overcurrent capacity.

[0088] According to some embodiments of the present application, the outer peripheral surface 31 of the end of the adapter 3 extending into the liquid injection hole 221 is welded to the inner peripheral surface 2211 of the liquid injection hole 221.

[0089] Combined Figure 8 As shown, after liquid injection, the laser L enters the liquid injection hole 221 and translates along the connection interface between the liquid injection hole 221 and the adapter 3 (when the liquid injection hole 221 is a circular hole, the laser L translates along a circular trajectory on the inner peripheral surface 2211 of the liquid injection hole), thereby welding the outer peripheral surface 31 of the end of the adapter 3 extending into the liquid injection hole 221 to the inner peripheral surface 2211 of the liquid injection hole 221, and the entire welding process is in a visible state.

[0090] Since the adapter 3 and the second electrode lead-out portion 22 can be connected in a state visible from the outside, the processing speed is fast, and the phenomenon of false soldering can be reduced, so that the connection between the adapter 3 and the second electrode lead-out portion 22 is stable, the over-current capacity is good, the welding quality is ensured, and the welding efficiency is improved.

[0091] According to some embodiments of the present application, as Figure 7 shown, the outer peripheral surface 31 of the end of the adapter 3 extending into the liquid injection hole 221 is a first conical surface, and the inner peripheral surface 2211 of the liquid injection hole 221 includes a second conical surface matching the first conical surface.

[0092] The first conical surface and the second conical surface may have the larger end facing the inside of the battery cell 102 and the smaller end facing the outside of the battery cell 102. The first conical surface and the second conical surface may also have the smaller end facing the inside of the battery cell 102 and the larger end facing the outside of the battery cell 102.

[0093] Through the cooperation of the first conical surface and the second conical surface, the centering effect of guiding the adapter 3 is achieved, and the outer peripheral surface 31 of the adapter 3 and the inner peripheral surface 2211 of the liquid injection hole 221 are ensured to be in contact, avoiding the problem of false soldering.

[0094] According to some embodiments of the present application, as Figure 7 shown, in the direction away from the inside of the battery cell 102, the diameter of the first conical surface gradually decreases.

[0095] Since the second conical surface cooperates with the first conical surface, the diameter of the end of the liquid injection hole 221 facing the inside of the battery cell 102 is larger, which is convenient for the adapter 3 to first connect to the electrode assembly 1, and then enter the housing together with the electrode assembly 1 and then extend into the liquid injection hole 221 to complete the connection. That is, through the above settings, the parts hidden inside the battery cell 102 are first connected, and then the parts visible from the outside are connected, ensuring the stable connection between the adapter 3 and the second tab 12, and also facilitating the assembly of the adapter 3 and the second electrode lead-out portion 22.

[0096] On the other hand, due to manufacturing errors, the outer peripheral surfaces 31 of the extending ends of the adapter 3 are not necessarily of equal height. When the outer peripheral surface 31 of the extending end is a cylindrical surface, it is easy to cause false soldering because the lower position of the outer peripheral surface 31 is not flush with the end edge of the liquid injection hole 221. By setting the outer peripheral surface 31 of the adapter 3 as a first conical surface that gradually decreases in the direction away from the inside of the battery cell 102, and pressing the adapter 3 against the liquid injection hole 221 during assembly, the higher position of the outer peripheral surface 31 can exceed the liquid injection hole 221, ensuring that the lower position of the outer peripheral surface 31 is flush with the end edge of the liquid injection hole 221 and avoiding false soldering.

[0097] According to some embodiments of the present application, as Figure 7 and Figure 9As shown, the battery cell 102 further includes a seal 26 for closing the liquid injection hole 221, and the seal 26 is disposed opposite to one end of the adapter 3 extending into the liquid injection hole 221.

[0098] The seal 26 has a plate-like structure and covers the liquid injection hole 221 and the end of the adapter 3 to prevent electrolyte leakage.

[0099] According to some embodiments of the present application, as Figure 9 shown, the liquid injection hole 221 includes a first hole section 221a and a second hole section 221b. The second hole section 221b is closer to the interior of the battery cell 102 than the first hole section 221a. The aperture of the second hole section 221b is smaller than that of the first hole section 221a. The outer peripheral surface 31 of the adapter 3 is connected to the inner peripheral surface 2211 of the second hole section 221b, and the seal 26 is disposed in the first hole section 221a.

[0100] The liquid injection hole 221 is a stepped hole, including a first hole section 221a and a second hole section 221b. The aperture of the first hole section 221a is relatively large, and the aperture of the second hole section 221b is relatively small. The second hole section 221b is relatively close to the interior of the battery cell 102. The first hole section 221a is used to accommodate the seal 26, and the second hole section 221b is used to accommodate one end of the adapter 3. The inner peripheral surface 2211 of the liquid injection hole 221 for connecting the adapter 3 is the inner wall of the second hole section 221b.

[0101] The connection interface between the adapter 3 and the second hole section 221b is located between the axis and the inner wall of the first hole section 221a. The first hole section 221a provides a relatively large space for welding operations, facilitating welding. At the same time, it also enables the connection interface between the adapter 3 and the second hole section 221b and the channels on the adapter 3 to be covered by the seal 26, ensuring a good sealing effect.

[0102] According to some embodiments of the present application, as Figure 10 shown, the battery cell 102 further includes a current collector 4 attached to the second tab 12 and used to connect the second tab 12 and the adapter 3 to achieve electrical connection between the second tab 12 and the adapter 3.

[0103] The current collector 4 has a plate-like structure, covers the second tab 12 of the electrode assembly 1, and connects one end of the adapter 3. The current collector 4 can be of any shape such as disc-shaped, rectangular, etc.

[0104] By providing the current collector 4, a relatively large area of the second tab 12 is directly connected to the current collector 4, improving the connection strength and the current-carrying area, such that the battery cell 102 has a relatively high current-carrying capacity.

[0105] According to some embodiments of the present application, as Figure 10 and Figure 11As shown, the current collector 4 covers one end of the electrode assembly 1 with the second tab 12. One end of the adapter 3 away from the liquid injection hole 221 is connected to the current collector 4. A first through hole 41 is formed in the current collector 4, and the position of the first through hole 41 corresponds to the internal space of the adapter 3.

[0106] The internal space of the adapter 3 refers to the channel in the adapter 3 for allowing the electrolyte to flow through.

[0107] The current collector 4 is disc-shaped. The current collector 4 covers both sides of the winding center hole 13 of the electrode assembly 1. The contact area between the current collector 4 and the second tab 12 is large, ensuring that the second tabs 12 on both sides of the winding center hole 13 can conduct current through the current collector 4 to avoid polarization problems and further improve the current-carrying capacity. By providing the first through hole 41 penetrating the current collector 4 and connecting to the internal space of the tubular adapter 3, the electrolyte can flow to the other end of the battery cell 102, realizing the rapid filling of the electrolyte from the bottom to the top inside the housing assembly 2, and improving the wetting effect and wetting rate of the electrolyte.

[0108] According to some embodiments of the present application, as Figure 11 shown, the current collector 4 is formed with a plurality of second through holes 42, and the positions of the second through holes 42 are offset from the internal space of the adapter 3.

[0109] The second through holes 42 are located at the positions of the current collector 4 corresponding to the second tabs 12, facilitating the flow of the electrolyte from the second through holes 42 to the end of the electrode assembly 1. In this direction, the resistance to the electrolyte is small, and it can quickly enter the gaps between the electrode sheets, improving the wetting rate and wetting effect of the electrolyte inside the electrode assembly 1.

[0110] According to some embodiments of the present application, as Figure 11 shown, a first groove 43 is formed on the surface of the current collector 4 facing the second tab 12. Both ends of the first groove 43 extend to the edge of the current collector 4 respectively, and the first through hole 41 is provided on the bottom wall 23 of the groove.

[0111] The surface of the current collector 4 facing the second tab 12 is recessed along its own thickness direction, thus forming the first groove 43. The first groove 43 spans the current collector 4 along the diameter direction of the current collector 4, enabling the connection between the central region and the edge region of the current collector 4, thereby forming a channel for the electrolyte to flow between the current collector 4 and the electrode assembly 1. And the first groove 43 passes through the gaps between any two adjacent electrode sheets of the electrode assembly 1, ensuring the wetting effect and wetting rate of the electrolyte.

[0112] The first groove 43 can be formed by thinning the current collector 4, for example, cutting and grinding the surface of the current collector 4 to form the first groove 43. The first groove 43 can also be formed by bending the current collector 4, for example, stamping the current collector 4 to form the first groove 43. In this embodiment, the first groove 43 is formed by bending the current collector 4 to prevent the thickness of the current collector 4 from thinning at the first groove 43, thereby ensuring the connection strength between the current collector 4 and the adapter 3.

[0113] The first groove 43 can be a straight line arranged along the diameter direction of the current collector 4 as shown in the figure, so that the first groove 43 passes through the gap between any two adjacent pole pieces of the electrode assembly 1 to ensure the electrolyte infiltration effect.

[0114] The first groove 43 can also be a curved or spiral shape connecting the edge and the center of the current collector 4, which not only makes the first groove 43 pass through the gap between any two adjacent pole pieces of the electrode assembly 1, but also extends the length of the first groove 43 and increases the overlapping area of the first groove 43 with each gap, further improving the electrolyte infiltration effect.

[0115] According to some embodiments of the present application, as Figure 12 shown, a second groove 44 is formed on the surface of the current collector 4 facing away from the second tab 12, and the bottom wall 23 of the second groove 44 is welded to the second tab 12.

[0116] Similarly to the forming method of the first groove 43, the forming method of the second groove 44 can be thinning the current collector 4 or bending the current collector 4.

[0117] By providing the second groove 44 on the surface of the current collector 4 facing away from the second tab 12, the second groove 44 marks the welding area for easy welding.

[0118] Optionally, the shape of the second groove is V-shaped, the apex angle of the V shape is close to the center of the current collector 4, and the opening of the V shape faces the edge of the current collector 4. By setting the second groove 44 to be V-shaped, both the inner layer and the outer layer of the second tab 12 close to the center have welding parts to avoid polarization.

[0119] According to some embodiments of the present application, a protrusion is formed on the surface of the current collector 4 facing the second tab 12, and the protrusion is opposite to the second groove 44.

[0120] By forming a protrusion on the surface of the current collector 4 facing the second tab 12, when the current collector 4 covers the second tab 12, the protrusion can be embedded in the second tab 12 to ensure full contact and no gap between the protrusion and the second tab 12. At the same time, the positions of the second groove 44 and the protrusion are corresponding, so that there is no gap between the second groove 44 and the second tab 12. When the welding head of the welding equipment acts on the second groove 44 to weld the second tab 12, the problem of false welding can be avoided.

[0121] The protrusion can be a conductive member bonded or welded to the side of the current collector 4 facing the electrode assembly 1. The protrusion can also be integrally formed with the current collector 4. For example, a second groove 44 is formed on the side of the current collector 4 facing away from the second tab 12 by bending the current collector 4, so that a protrusion is formed on the side of the current collector 4 facing the second tab 12.

[0122] In a second aspect, an embodiment of the present application provides a battery 100, as Figure 2 shown. The battery 100 includes the aforementioned battery cell 102. By providing the aforementioned battery cell 102, the current collecting component in the battery 100 of the present application only needs to occupy one side in the height direction of the battery cell 102. The overall structure of the battery 100 is compact, and the battery 100 has good safety and is convenient to assemble.

[0123] In a third aspect, an embodiment of the present application provides an electrical device, as Figure 1 shown. The electrical device can be selected as a vehicle 1000, and the vehicle 1000 includes the aforementioned battery 100. The battery 100 occupies a small space, has good safety, and is convenient to assemble, which is conducive to the miniaturization development of the electrical device.

[0124] In a fourth aspect, an embodiment of the present application provides a manufacturing method of a battery cell 102, as Figure 13 shown. The manufacturing method includes:

[0125] S1. Provide an electrode assembly 1, the electrode assembly 1 includes a first tab 11 and a second tab 12 with opposite polarities, the first tab 11 and the second tab 12 are respectively located at both ends of the electrode assembly 1, and the electrode assembly 1 has a winding center hole 13;

[0126] S2. Provide a housing assembly 2, the housing assembly 2 includes a first electrode lead-out part 21 and a second electrode lead-out part 22 for inputting or outputting electric energy, both the first electrode lead-out part 21 and the second electrode lead-out part 22 are arranged on the same side of the housing assembly 2, and the second electrode lead-out part 22 is provided with a liquid injection hole 221 for injecting electrolyte into the battery cell 102;

[0127] S3. Provide an adapter 3, the adapter 3 is in a tubular shape;

[0128] S4. Pass the adapter 3 through the winding center hole 13, and connect one end of the adapter 3 to the second tab 12; place the adapter 3 and the electrode assembly 1 into the housing assembly 2, so that both the first electrode lead-out part 21 and the second electrode lead-out part 22 are arranged on the side of the housing assembly 2 close to the first tab 11, electrically connect the first tab 11 to the first electrode lead-out part 21, and extend the other end of the adapter 3 into the liquid injection hole 221 and connect the outer peripheral surface 31 to the inner peripheral surface 2211 of the liquid injection hole 221 to realize the electrical connection between the second tab 12 and the second electrode lead-out part 22.

[0129] It should be noted that for the relevant structure of the battery cell 102 manufactured by the above manufacturing method of the battery cell 102, reference can be made to the battery cell 102 provided in the above embodiments.

[0130] When assembling the battery cell 102 based on the above manufacturing method of the battery cell 102, it is not necessary to perform the steps in sequence as described above. That is to say, the steps can be executed in the order mentioned in the embodiments, or in an order different from that mentioned in the embodiments, or several steps can be executed simultaneously. For example, the execution of steps S1, S2, and S3 is not in sequence and can also be carried out simultaneously.

[0131] Fifthly, an embodiment of the present application provides a manufacturing device 7 for a battery cell 102, as Figure 14 shown, which includes a first providing device 71, a second providing device 72, a third providing device 73, a first assembling device 74, and a second assembling device 75.

[0132] The first providing device 71 is used to provide the electrode assembly 1. The electrode assembly 1 includes a first tab 11 and a second tab 12 with opposite polarities. The first tab 11 and the second tab 12 are respectively located at both ends of the electrode assembly 1, and the electrode assembly 1 has a winding center hole 13.

[0133] The second providing device 72 is used to provide the housing assembly 2. The housing assembly 2 includes a first electrode lead-out portion 21 and a second electrode lead-out portion 22 for inputting or outputting electric energy. Both the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are provided on the same side of the housing assembly 2, and the second electrode lead-out portion 22 is provided with a liquid injection hole 221 for injecting electrolyte into the battery cell 102.

[0134] The third providing device 73 is used to provide the adapter 3, and the adapter 3 is tubular.

[0135] The first assembling device 74 is used to pass the adapter 3 through the winding center hole 13 and connect one end of the adapter 3 to the second tab 12.

[0136] The second assembling device 75 is used to place the adapter 3 and the electrode assembly 1 into the housing assembly 2, so that both the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are located on the side of the housing assembly 2 close to the first tab 11, electrically connect the first tab 11 to the first electrode lead-out portion 21, and extend the other end of the adapter 3 into the liquid injection hole 221 and connect the outer peripheral surface 31 to the inner peripheral surface 2211 of the liquid injection hole 221 to realize the electrical connection between the second tab 12 and the second electrode lead-out portion 22.

[0137] For the relevant structure of the battery cell 102 manufactured by the above manufacturing device 7, reference can be made to the battery cell 102 provided in the above embodiments.

[0138] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0139] According to some embodiments of the present application, please refer to Figures 3 - 7 As shown, a cylindrical battery cell 102 includes an electrode assembly 1, a housing assembly 2, a transfer member 3, a current collector 4, a first insulating member 51, a second insulating member 52, a first transfer member 6, and a sealing member 26.

[0140] The housing assembly 2 includes a bottom wall 23, a side wall 24, an end cap 25, and a first electrode lead-out portion 21 and a second electrode lead-out portion 22 for inputting or outputting electric energy. The inner space of the housing assembly 2 formed by the bottom wall 23, the side wall 24, and the end cap 25. The second electrode lead-out portion 22 is an electrode terminal insulatedly installed on the end cap 25, and the first electrode lead-out portion 21 is the portion of the end cap 25 between the electrode terminal and the side wall 24. The electrode assembly 1 has a winding center hole 13. At both ends of the electrode assembly 1 along the extending direction of the winding center hole 13, a first tab 11 and a second tab 12 are respectively provided, and the polarities of the first tab 11 and the second tab 12 are opposite. The electrode assembly 1 is disposed in the inner space of the housing assembly 2, and the first tab 11 of the electrode assembly 1 faces the end cap 25, and the second tab 12 faces the bottom wall 23. The first tab 11 and the end cap 25 are electrically connected through the first transfer member 6. The first insulating member 51 is disposed between the electrode assembly 1 and the end cap 25 to insulatively isolate the second electrode lead-out portion 22 from the first tab 11 and the second transfer member 3. The current collector 4 is disposed between the second tab 12 and the bottom wall 23 to cover the second tab 12 and be welded to the second tab 12. The transfer member 3 passes through the winding center hole 13 of the electrode assembly 1, and the second insulating member 52 is sleeved on the transfer member 3 to insulatively isolate the transfer member 3 from the inner wall of the winding center hole 13. The second electrode lead-out portion 22 is provided with a liquid injection hole 221 penetrating along the thickness direction of the end cap 25. The liquid injection hole 221 is a stepped hole, and the liquid injection hole 221 includes a first hole section 221a and a second hole section 221b. The diameter of the first hole section 221a is relatively large and relatively far from the inside of the battery cell 102, and the diameter of the second hole section 221b is relatively small and relatively close to the inside of the battery cell 102. One end of the transfer member 3 is connected to the current collector 4, and the other end extends into the second hole section 221b and is butt-welded to the inner wall of the second hole section 221b, thereby realizing the electrical connection between the second tab 12 and the second electrode lead-out portion 22. The transfer member 3 is a tubular structure, and a first through hole 41 is provided on the current collector 4. The first through hole 41 corresponds to the inner space of the transfer member 3 to realize injecting electrolyte into the battery cell 102 from the liquid injection hole 221 through the inner space of the transfer member 3 and the first through hole 41. The sealing member 26 is configured to be fitted to the first hole section 221a after injecting electrolyte into the battery cell 102 and forming, so as to seal the liquid injection hole 221.

[0141] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: An electrode assembly, including a first tab and a second tab with opposite polarities, the first tab and the second tab are respectively located at two ends of the electrode assembly, and the electrode assembly has a winding central hole; A housing assembly, including a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the electrode assembly is arranged inside the housing assembly, the first electrode lead-out portion and the second electrode lead-out portion are both arranged on one side of the housing assembly close to the first tab, the first electrode lead-out portion is electrically connected to the first tab, and the second electrode lead-out portion is provided with a liquid injection hole for injecting electrolyte into the battery cell; An adapter, the adapter is tubular and penetrates through the winding central hole, one end of the adapter is connected to the second tab, and the other end of the adapter extends into the liquid injection hole and the outer peripheral surface is connected to the inner peripheral surface of the liquid injection hole to realize the electrical connection between the second tab and the second electrode lead-out portion.

2. The battery cell according to claim 1, characterized in that, The outer peripheral surface of the end of the adapter extending into the liquid injection hole is welded to the inner peripheral surface of the liquid injection hole.

3. The battery cell according to claim 1 or 2, characterized in that The outer peripheral surface of the end of the adapter extending into the liquid injection hole is a first conical surface, and the inner peripheral surface of the liquid injection hole includes a second conical surface matching the first conical surface.

4. The battery cell according to claim 3, characterized in that, Towards the direction away from the inside of the battery cell, the diameter of the first conical surface gradually decreases.

5. The battery cell according to claim 1, wherein The battery cell further includes a sealing member for sealing the liquid injection hole, and the sealing member is arranged opposite to the end of the adapter extending into the liquid injection hole.

6. The battery cell according to claim 5, wherein, The liquid injection hole includes a first hole section and a second hole section, the second hole section is closer to the inside of the battery cell than the first hole section, the aperture of the second hole section is smaller than that of the first hole section, the outer peripheral surface of the adapter is connected to the inner peripheral surface of the second hole section, and the sealing member is arranged in the first hole section.

7. The battery cell according to claim 1, characterized in that, The battery cell further includes a current collector, the current collector is attached to the second tab and is used for connecting the second tab and the adapter to realize the electrical connection between the second tab and the adapter.

8. The battery cell according to claim 7, wherein, The current collector covers one end of the electrode assembly with the second tab, the end of the adapter away from the liquid injection hole is connected to the current collector, and a first through hole is formed on the current collector, and the first through hole corresponds to the internal space position of the adapter.

9. The battery cell according to claim 8, wherein, The current collector is formed with a plurality of second through holes, and the second through holes are staggered with the internal space position of the adapter.

10. The battery cell according to claim 8 or 9, characterized in that, A first groove is formed on the surface of the current collector facing the second tab, and both ends of the first groove extend to the edge of the current collector respectively, and the first through hole is arranged on the bottom wall of the groove.

11. The battery cell according to claim 7, wherein, A second groove is formed on the surface of the current collector facing away from the second tab, and the bottom wall of the second groove is welded to the second tab.

12. The battery cell according to claim 11, wherein, A protrusion is formed on the surface of the current collector facing the second tab, and the protrusion is opposite to the second groove.

13. A battery, characterized in that, Including the battery cell according to any one of claims 1-12.

14. An electrical device, characterized in that, Including the battery according to claim 13.

15. A method for manufacturing a battery cell, characterized in that, Comprising: Provide an electrode assembly, the electrode assembly including a first tab and a second tab with opposite polarities, the first tab and the second tab being respectively located at two ends of the electrode assembly, and the electrode assembly having a winding center hole; Provide a housing assembly, the housing assembly including a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the first electrode lead-out portion and the second electrode lead-out portion both being provided on the same side of the housing assembly, and the second electrode lead-out portion being provided with a liquid injection hole for injecting electrolyte into the battery cell; Provide an adapter, the adapter being tubular; Insert the adapter through the winding center hole, and connect one end of the adapter to the second tab; place the adapter and the electrode assembly into the housing assembly so that the first electrode lead-out portion and the second electrode lead-out portion are both provided on the side of the housing assembly close to the first tab, electrically connect the first tab to the first electrode lead-out portion, and extend the other end of the adapter into the liquid injection hole and connect the outer peripheral surface to the inner peripheral surface of the liquid injection hole to achieve electrical connection between the second tab and the second electrode lead-out portion.

16. A manufacturing device for a battery cell, characterized in that, Comprising: A first providing device for providing an electrode assembly, the electrode assembly including a first tab and a second tab with opposite polarities, the first tab and the second tab being respectively located at two ends of the electrode assembly, and the electrode assembly having a winding center hole; A second providing device for providing a housing assembly, the housing assembly including a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the first electrode lead-out portion and the second electrode lead-out portion both being provided on the same side of the housing assembly, and the second electrode lead-out portion being provided with a liquid injection hole for injecting electrolyte into the battery cell; A third providing device for providing an adapter, the adapter being tubular; A first assembling device for inserting the adapter through the winding center hole and connecting one end of the adapter to the second tab; A second assembling device for placing the adapter and the electrode assembly into the housing assembly so that the first electrode lead-out portion and the second electrode lead-out portion are both located on the side of the housing assembly close to the first tab, electrically connecting the first tab to the first electrode lead-out portion, and extending the other end of the adapter into the liquid injection hole and connecting the outer peripheral surface to the inner peripheral surface of the liquid injection hole to achieve electrical connection between the second tab and the second electrode lead-out portion.

Images