Battery cell, battery, power consumption device, and manufacturing method and equipment of battery cell

Abstract

The present application relates to the field of battery technology, and more particularly to a battery cell, a battery, a power consumption device, and a manufacturing method and device for a battery cell. The battery cell includes a housing including a wall, an electrode terminal installed on the wall, the electrode terminal having an inlet hole penetrating along its axial direction, the inlet hole including a first hole segment and a second hole segment, the second hole segment being closer to the inside of the battery cell than the first hole segment, and the hole diameter of the second hole segment being smaller than the hole diameter of the first hole segment, and a sealing member for sealing the inlet hole, the sealing member including a main body and a stopper protrusion, the main body hermetically fitting to the first hole segment, the main body including a first surface facing the inside of the battery cell and a second surface facing away from the inside of the battery cell, which are opposed to each other along the axial direction, the stopper protrusion formed on the first surface and fitting to the second hole segment so that the main body is not easily displaced or tilted, thereby improving the sealing property and improving the service life and safety of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and specifically, to battery cells, batteries, power-consuming devices, and manufacturing methods and equipment for battery cells.

Background Art

[0002] In a major environment that pursues energy conservation and emission reduction, batteries are widely applied to power-consuming devices such as mobile phones, computers, and electric vehicles, providing electrical energy for power-consuming devices. The service life and safety of batteries are extremely important for the performance of power-consuming devices.

Summary of the Invention

[0003] The purpose of this application is to provide a battery cell, a battery, a power-consuming device, and a manufacturing method and equipment for the battery cell to improve the service life and safety of the battery.

[0004] The embodiments of this application are realized as follows.

[0005] According to a first aspect, the embodiments of this application provide a battery cell, the battery cell including a housing including a wall portion, and an electrode terminal installed on the wall portion, the electrode terminal having a liquid injection hole penetrating along its axial direction, the liquid injection hole including a first hole segment and a second hole segment, the second hole segment being closer to the inside of the battery cell than the first hole segment, and the aperture of the second hole segment being smaller than the aperture of the first hole segment; and a sealing member for sealing the liquid injection hole, the sealing member including a main body and a stopper protrusion, the main body being hermetically fitted to the first hole segment, the main body including a first surface facing the inside of the battery cell and a second surface facing away from the inside of the battery cell that are opposite to each other along the axial direction, and the stopper protrusion being formed on the first surface and including a sealing member that fits with the second hole segment.

[0006] In the technical solution of this application, the main body and the stopper protrusion are integrally connected to form a sealing member. Blocked by the inner wall of the second hole segment, it is difficult for the stopper protrusion to be displaced or tilted. Therefore, it is also difficult for the main body to be displaced or tilted, ensuring that the main body is hermetically fitted into the first hole segment. Thereby, the sealing performance of the liquid injection hole is improved, the problem of liquid leakage of the battery cell is alleviated, and the service life and safety of the battery cell are improved.

[0007] In one embodiment of this application, the main body further includes an outer peripheral surface connecting the first surface and the second surface, which is welded to the hole wall of the first hole segment.

[0008] In the above technical solution, the sealing member and the electrode terminal are connected by welding, with a fast processing speed and can improve production efficiency.

[0009] In one embodiment of this application, the second surface includes a central region and an edge region for connection to the busbar component. A first groove is provided on the second surface. The first groove is installed surrounding the outer periphery of the central region, and the edge region is installed surrounding the outer periphery of the first groove.

[0010] In the above technical solution, the sealing member is not only used to seal the liquid injection hole but also used to realize the electrical connection between the electrode terminal and the busbar component. By providing a first groove between the central region and the edge region of the second surface, the edge region is connected to the first outer peripheral surface of the main body. The first groove separates the central region and the edge region. The first groove is used to release the welding stress between the first outer peripheral surface and the inner wall of the first hole segment so that the central region does not deform. It can be ensured that the central region is flat and it is difficult for the phenomenon of dummy welding to appear during the welding of the flat central region and the busbar component, and it can be ensured that the current passing between the electrode terminal and the busbar component is stable.

[0011] According to another aspect, by configuring to connect the central region of the second surface to the bus bar component, the area of the part for connecting to the original bus bar component of the electrode terminal (that is, one surface of the electrode terminal away from the battery cell) can be reduced, and the aperture of the liquid injection hole can be set larger, thereby effectively improving the liquid injection efficiency.

[0012] In one embodiment of the present application, the projection of the stopper protrusion onto the second surface along the axial direction is located within the central region.

[0013] In the above technical solution, the stopper Outlet section is installed so that its position corresponds to the position of the central region, further reinforcing the structural strength of the central region and playing a role in preventing deformation of the central region.

[0014] In one embodiment of the present application, the edge region is recessed toward the inside of the battery cell along the axial direction with respect to the central region.

[0015] In the above technical solution, by installing the edge region of the main body to be recessed with respect to the adjacent central region, it is possible to prevent the weld seam from being higher than the central region along the axial direction, play a role in protecting the weld seam, and also avoid the protruding weld seam interfering with the bus bar component, so as not to affect the connection between the bus bar component and the central region.

[0016] In one embodiment of the present application, the electrode terminal includes a first end face perpendicular to the axial direction and away from the inside of the battery cell, and the central region is flush with the first end face.

[0017] In the above technical solution, the sealing member does not occupy extra space outside the battery cell, and the central region of the sealing member is not lower than the first end face, which is beneficial to the close contact between the central region and the surface of the bus bar component, ensuring that the connection between the central region and the bus bar component is stable and reliable, and enhancing the current-carrying capacity.

[0018] In one embodiment of the present application, the outer peripheral surface is a first conical surface whose diameter gradually decreases in a direction approaching the inside of the battery cell along the axial direction, and the hole wall of the first hole segment is a second conical surface matching the first conical surface.

[0019] In the above technical solution, by setting both the outer peripheral surface of the main body and the hole wall of the first hole segment as conical surfaces, the conical surface has the role of guiding the sealing member into the liquid injection hole, facilitating assembly. During laser welding, the second conical surface further shields and reflects the laser propagating along the axial direction, alleviating the problem that the laser enters the inside of the battery cell through the gap between the sealing member and the liquid injection hole and preventing the functional components inside the battery cell from being burned.

[0020] In one embodiment of the present application, a second groove is installed at the center of the second surface.

[0021] In the above technical solution, the second groove can be used as the support position or the marking position of the welding device. The welding device can rotate the welding head once along the outer ring of the edge region with the second groove as the fulcrum or the center of the circle, and complete the welding between the main body and the electrode terminal, making the welding easier.

[0022] In one embodiment of the present application, the second groove is hemispherical.

[0023] In the above technical solution, the inner wall of the second groove is spherical. When the second groove is used as the support position of the welding device, it is beneficial for the welding device to rotate in the second groove, ensuring smooth welding operation and further facilitating welding.

[0024] In one embodiment of the present application, the liquid injection hole further includes a third hole segment, the third hole segment is closer to the inside of the battery cell than the second hole segment, the hole diameter of the third hole segment is smaller than the hole diameter of the second hole segment, and the stopper protrusion covers the third hole segment.

[0025] In the above technical solution, by installing the third hole segment, when the electrolyte overflows from the third hole segment, the second hole segment can accommodate the overflowed electrolyte, making it difficult for the electrolyte to overflow into the first hole segment, effectively alleviating the corrosion of the welding joint by the electrolyte, and improving the sealing effect.

[0026] In one embodiment of the present application, the stopper protrusion includes a third surface facing the inside of the battery cell along the axial direction, and a transition connection surface is formed between the hole wall of the second hole segment and the hole wall of the third hole segment. The transition connection surface faces the third surface and there is a gap.

[0027] In the above technical solution, by providing a gap between the third surface and the transition connection surface and allowing a certain manufacturing tolerance between the length of the stopper protrusion in the axial direction and the length of the second hole segment, overpositioning is prevented, ensuring the close contact between the outer peripheral surface of the main body and the hole wall of the first hole segment, and ensuring that the first surface of the main body can be in close contact with the stepped surface, thereby improving the sealing performance between the main body and the electrode terminal.

[0028] In one embodiment of the present application, the battery cell further includes an electrode assembly. One end of the electrode assembly facing the wall portion forms a first tab. The transition connection surface includes a main connection region and a welding region. The welding region is used for welding with the first tab. The main connection region is connected to the hole wall of the second hole segment. The welding region is connected to the hole wall of the third hole segment. There is a first gap between the main connection region and the third surface, and there is a second gap larger than the first gap between the welding region and the third surface.

[0029] In the above technical solution, the welding region is recessed towards the inside of the battery cell along the axial direction with respect to the main connection region. The welding region is the stopper protrusion Outlet sectionSo that it is further away from the third surface, the weld seam formed in the welding area retracts from the stopper protrusion, so as not to affect the positioning accuracy of the sealing member and ensure the sealing performance of the sealing member.

[0030] According to a second aspect, an embodiment of the present application provides a battery including the battery cell described above.

[0031] The battery according to the embodiment of the present application has good sealing performance of its battery cell, is less likely to leak liquid, and has a long service life and high safety of the battery.

[0032] According to a third aspect, an embodiment of the present application provides an electric power consuming device including the battery described above.

[0033] The battery of the electric power consuming device according to the present application has a long service life and high safety, and the electric power consuming device has good durability and can be used safely.

[0034] According to a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell. The method includes providing a housing including a wall portion, providing an electrode terminal, the electrode terminal having a liquid injection hole penetrating along its axial direction, the liquid injection hole including a first hole segment and a second hole segment smaller than the aperture of the first hole segment, providing a sealing member including a main body including opposite first and second surfaces and a stopper protrusion formed on the first surface, installing the electrode terminal on the wall portion such that the second hole segment is closer to the inside of the battery cell than the first hole segment, sealingly fitting the main body into the first hole segment, and sealing the liquid injection hole with the sealing member such that the stopper protrusion is fitted into the second hole segment.

[0035] According to a fifth aspect, an embodiment of the present application provides manufacturing equipment for a battery cell, the equipment including: a first providing device for providing a housing including a wall portion; a second providing device used for providing an electrode terminal, the electrode terminal having a liquid injection hole penetrating along its axial direction, the liquid injection hole including a first hole segment and a second hole segment smaller in hole diameter than the first hole segment; a third providing device for providing a sealing member including a main body having opposing first and second surfaces and a stopper protrusion formed on the first surface; and an assembling device used for installing the electrode terminal on the wall portion such that the second hole segment is closer to the inside of the battery cell than the first hole segment, sealingly fitting the main body into the first hole segment, and fitting the stopper protrusion into the second hole segment to seal the liquid injection hole with the sealing member.

Brief Description of the Drawings

[0036] 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 described below. It should be understood that the following drawings merely show some embodiments of the present application and should not be regarded as a limitation on the scope. Those skilled in the art can obtain other related drawings based on these drawings without creative effort.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying out the Invention

[0037] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, hereinafter, while combining the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described. It is obvious that the described embodiments are only a part of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments obtained on the premise that those skilled in the art do not pay creative efforts all belong to the protection scope of the present application.

[0038] Unless otherwise defined, all scientific and technical terms used in the present application have the same meaning as commonly understood by those skilled in the art of the present application. In the present application, the terms used in the description of the application are only used to explain specific embodiments and are not intended to limit the present application. The terms "including" and "having" and any variations thereof in the description of the present application, the claims, and the above drawings are intended to cover non-exclusive "including". The terms such as "first" and "second" in the description of the present application, the claims, or the above drawings are for distinguishing different objects and are not for explaining a specific order or primary-secondary relationship.

[0039] The "embodiment" mentioned in the present application means that a specific feature, structure, or characteristic described in combination with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase at each position 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.

[0040] In the description of this application, unless otherwise specified and limited, the terms "attachment", "connection", "linkage", and "installation" should be understood in a broad sense. For example, they may be fixed connections, detachable connections, or integral connections; they may be directly connected or indirectly connected through an intermediate medium; and the interiors of two elements may be in communication. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0041] The term "and / or" in this application only describes the relationship of the relevant objects and indicates that three relationships may exist. For example, A and / or B can indicate three situations: A exists, A and B exist simultaneously, and B exists. Also, the character " / " in this application generally represents that the relevant objects before and after are in an "or" relationship.

[0042] In the embodiments of this application, the same reference numerals represent the same components. Also, for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. Note that the dimensions such as the thickness, length, and width of each component in the embodiments of this application shown in the drawings, and the overall thickness, length, and width of the integrated device are only exemplary and do not limit this application.

[0043] "Plurality" in this application means two or more (including two).

[0044] In this application, the battery cell may include, but is not limited to in the embodiments of this application, lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc.

[0045] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack, etc. The battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

[0046] The battery cell includes an electrode assembly and an electrolyte. 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 electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector includes a positive electrode current collecting part and a positive electrode tab. The positive electrode current collecting part is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode plate 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 tab. The negative electrode current collecting part is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

[0047] The battery cell further includes a housing for accommodating the electrode assembly and electrode terminals. The electrode terminals are attached to the housing and are used to be electrically connected to the electrode assembly so as to realize the charging and discharging of the electrode assembly.

[0048] The battery cell is further provided with a liquid injection hole which communicates the inside and the outside of the battery cell and is used for injecting electrolyte from the outside into the inside. After assembling the electrode assembly, the electrode terminal and the case, the electrolyte is injected into the housing through the liquid injection hole, and the liquid injection hole is closed with a sealing member until after the first charge and discharge (i.e., after formation).

[0049] The liquid injection hole is usually installed in the housing. After the liquid injection is completed, a sealing member (such as a sealing nail) is installed in the housing by means of a rivet to seal the liquid injection hole. When the rivet is caulked, the housing is likely to be deformed under stress, resulting in a decrease in the sealing performance at the liquid injection hole and causing liquid leakage. In order to avoid the deformation of the housing, there is also a sealing method of installing a sealing member with a sheet-like structure in the liquid injection hole. However, the sealing member with a sheet-like structure is likely to be inclined, warped or displaced, resulting in a decrease in the sealing performance at the liquid injection hole and causing liquid leakage. In addition, the liquid leakage of the battery cell significantly reduces the service life and safety of the battery.

[0050] In order to solve the problem of liquid leakage of the battery cell and improve the service life and safety of the battery cell, the present application provides a technical solution. The liquid injection hole is installed in the electrode terminal. The liquid injection hole penetrates along the axial direction P of the electrode terminal. The sealing member is connected to the electrode terminal to seal the liquid injection hole. The axial thickness of the electrode terminal is large, the strength is high, it is not easy to deform, and it is not easy to affect the sealing performance. At the same time, the liquid injection hole is configured to include a first hole segment and a second hole segment. The second hole segment is closer to the inside of the battery cell than the first hole segment. The aperture of the second hole segment is smaller than the aperture of the first hole segment. The sealing member is configured to include a main body and a stopper protrusion. Here, the main body is hermetically fitted with the first hole segment, and the stopper protrusion is formed on the surface of the main body facing the inside of the battery cell. The fitting of the stopper protrusion and the second hole segment prevents the inclination of the main body and ensures the close contact between the outer peripheral surface of the main body and the hole wall of the first hole segment. Thereby, the sealing performance at the liquid injection hole is improved, the problem of liquid leakage of the battery cell is alleviated, and the service life and safety of the battery cell are improved. 1 of the hole segment to ensure the close contact, thereby realizing the improvement of the sealing performance at the liquid injection hole, alleviating the problem of liquid leakage of the battery cell, and improving the service life and safety of the battery cell.

[0051] The technical solution described in the embodiments of this application is applicable to batteries and power-consuming devices using the batteries.

[0052] The power-consuming device may be a vehicle, a mobile phone, a portable device, a notebook computer, a steamship, an aircraft, an electric toy, and an electric tool, etc. The vehicle may be a fuel-powered vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. The aircraft includes airplanes, rockets, space shuttles, and spaceships, etc. The electric toy includes stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric steamship toys, electric airplane toys, etc. The electric tool includes metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric drivers, electric hammers, hammer drills, concrete vibrators, electric planers, etc. In the embodiments of this application, the above power-consuming devices are not particularly limited.

[0053] For the ease of description, the following embodiments will take the power-consuming device being the vehicle 1000 as an example for description.

[0054] The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended range electric vehicle, or the like. As shown in FIG. 1, a battery 100, a controller 300, and a motor 200 may be installed inside the vehicle 1000. The controller 300 is for controlling the battery 100 to supply power to the motor 200. For example, the battery 100 may be installed at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000 and applied to the electrical circuit system of the vehicle 1000. For example, it can be used for the starting, navigation, and operating power requirements during driving 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 to provide driving power to the vehicle 1000 instead of, or in part of, fuel oil or natural gas.

[0055] To meet different power usage requirements, as shown in FIG. 2, the battery 100 may include a plurality of battery cells 102. Here, the plurality of battery cells 102 may be connected in series, in parallel, or in series-parallel. Series-parallel connection refers to a mixture of series connection and parallel connection. The battery 100 may be called a battery pack 100. Optionally, the plurality of battery cells 102 may be first connected in series, in parallel, or in series-parallel to form battery modules, and the plurality of battery modules may be further connected in series, in parallel, or in series-parallel to form the battery 100. That is, the plurality of battery cells 102 may directly form the battery 100, or may first form battery modules, and the battery modules may further form the battery 100.

[0056] The battery 100 may further include a housing 101 (also referred to as a cover), the interior of the housing 101 having a hollow structure, and a plurality of battery cells 102 being accommodated within the housing 101. The housing 101 may include two parts for accommodation (reference may be made to FIG. 2), where they are respectively referred to as a first housing part 1011 and a second housing part 1012, and the first housing part 1011 and the second housing part 1012 are integrally engaged. The shapes of the first housing part 1011 and the second housing part 1012 may be determined based on the shape formed by combining the plurality of battery cells 102, and both the first housing part 1011 and the second housing part 1012 may each have one opening. For example, both the first housing part 1011 and the second housing part 1012 may be hollow rectangular parallelepipeds, and only one surface of each is the opening surface. The opening of the first housing part 1011 and the opening of the second housing part 1012 are oppositely installed, and the first housing part 1011 and the second housing part 1012 are engaged with each other to form a housing 101 having a sealed cavity. Among the first housing part 1011 and the second housing part 1012, one may be a rectangular parallelepiped with an opening, and the other may be a cover plate structure for closing the opening of the rectangular parallelepiped. After combining the plurality of battery cells 102 in parallel connection, series connection, or series-parallel connection with each other, they are placed within the housing 101 formed by engaging the first housing part 1011 and the second housing part 1012.

[0057] The following will describe one of the battery cells 102 in detail. As shown in FIGS. 3, 4, and 5, the battery cell 102 includes a housing 1, an electrode terminal 2, and a sealing member 3. The housing 1 includes a wall portion. The electrode terminal 2 is installed on the wall portion. As shown in FIGS. 6 and 7, the electrode terminal 2 has a liquid injection hole 23 penetrating along its axial direction P. The liquid injection hole 23 includes a first hole segment 231 and a second hole segment 232. The second hole segment 232 is closer to the inside of the battery cell 102 than the first hole segment 231. The aperture of the second hole segment 232 is smaller than that of the first hole segment 231. The sealing member 3 is used to seal the liquid injection hole 23. The sealing member 3 includes a main body 31 and a stopper protrusion 32. The main body 31 is sealingly fitted into the first hole segment 231. The main body 31 includes a first surface 311 facing the inside of the battery cell 102 and a second surface 312 facing away from the inside of the battery cell 102, which are opposite to each other along the axial direction P. The stopper protrusion 32 is formed on the first surface 311 and fitted with the second hole segment 232.

[0058] The inside of the housing 1 forms a space for accommodating the electrode assembly 4. The shape of the housing 1 may be determined according to the specific shape of the electrode assembly 4. For example, if the electrode assembly 4 has a cylindrical structure, the housing 1 may select a cylindrical case. If the electrode assembly 4 has a rectangular parallelepiped structure, the housing 1 may select a rectangular parallelepiped case. Exemplarily, both the electrode assembly 4 and the housing 1 are cylindrical.

[0059] The housing 1 includes a case and an end cap 13. The case includes a side wall 12 and a bottom wall 11. The side wall 12 is installed surrounding the bottom wall 11. One end of the side wall 12 is connected to the bottom wall 11. The other end of the side wall 12 surrounds an opening opposite to the bottom wall 11. The end cap 13 covers the opening to form a sealed space, which is a space for accommodating the electrode assembly 4. Here, the wall portion is the bottom wall 11 or the end cap 13. The drawings in the specification of this application show an embodiment where the wall portion is the bottom wall 11. In other embodiments, the wall portion may be the end cap 13.

[0060] In some embodiments, an electrode lead-out hole is provided in the wall portion, and the electrode terminal 2 is drilled through the electrode lead-out hole and filled with an elastic sealing member 3 in the gap between the outer peripheral surface of the electrode terminal 2 and the inner wall of the through hole so as to achieve sealing. Optionally, the elastic sealing member 3 is made of an insulating elastic polymer material so as to achieve insulation between the wall portion and the electrode terminal 2. In some other embodiments, a local area of the wall portion may be thickened to form the electrode terminal 2.

[0061] The axial direction P of the electrode terminal 2 is perpendicular to the wall portion. The electrode terminal 2 has a first end and a second end along its axial direction P. The first end has a first end face 21, and the second end has a second end face 22. The first end face 21 and the second end face 22 face each other along the axial direction P. Here, the first end extends out of the housing 1 such that the first end face 21 faces away from the inside of the battery cell 102, and the second end is located inside the housing 1 such that the second end face 22 faces the inside of the battery cell 102.

[0062] To realize the communication between the inside and the outside of the battery cell 102, the liquid injection hole 23 extends from the first end to the second end of the electrode terminal 2 and penetrates through the first end face 21 and the second end face 22 respectively. The liquid injection hole 23 is a stepped hole, including a first hole segment 231 and a second hole segment 232. The aperture of the first hole segment 231 is relatively large, and the aperture of the second hole segment 232 is relatively small. The hole wall of the first hole segment 231 and the hole wall of the second hole segment 232 are connected by a stepped surface 234, and the stepped surface 234 faces away from the inside of the battery cell 102.

[0063] The sealing member 3 includes a main body 31 and a stopper protrusion 32. The main body 31 is used to connect the electrode terminal 2 and seal the liquid injection hole 23, and the stopper protrusion 32 is used to prevent warping or displacement of the main body 31.

[0064] The outer surface of the main body 31 includes a first surface 311 facing the inside of the battery cell 102 and opposing along the axial direction P, a second surface 312 facing away from the inside of the battery cell 102, and a first outer peripheral surface 313. In other words, the second surface 312 is the surface where the main body 31 is exposed to the outside of the battery cell 102, and the first outer peripheral surface 313 is connected to the central axis surrounding the main body 31 itself and is connected to the first surface 311 and the second surface 312. The central axis of the main body 31 extends in the axial direction P. To achieve sealing, the first outer peripheral surface 313 of the main body 31 is closely connected to the hole wall of the first hole segment 231.

[0065] "The stopper protrusion 32 is formed on the first surface 311" means that the stopper protrusion 32 protrudes from the first surface 311 along the axial direction P toward the inside of the battery cell 102. The stopper protrusion 32 includes a second outer peripheral surface 322 connecting the third surface 321 and the first surface 311 of the main body 31, and a third surface 321 facing away from the first surface 311 of the main body 31 and toward the inside of the battery cell 102.

[0066] The stopper protrusion 32 extends to the second hole segment 232 to achieve fitting with the second hole segment 232, and the stopper protrusion 32 and the second hole segment 232 may be interference fit or clearance fit. That is, between the second outer peripheral surface 322 of the stopper protrusion 32 and the hole wall of the second hole segment 232, it may be completely in close contact or there may be a gap.

[0067] When the second outer peripheral surface 322 of the stopper protrusion 32 and the hole wall of the second hole segment 232 are completely in close contact, the stopper protrusion 32 also has a certain sealing role to prevent the electrolyte from entering the second hole segment 232, improving the sealing performance and further alleviating the problem of electrolyte leakage.

[0068] When there is a gap between the second outer peripheral surface 322 of the stopper protrusion 32 and the hole wall of the second hole segment 232, it serves to facilitate the entry of the stopper protrusion 32 into the second hole segment 232, allowing for a certain manufacturing tolerance in the hole diameter of the second hole segment 232 and the diameter of the stopper protrusion 32, and further allowing the direction in which the stopper protrusion 32 enters the second hole segment 232 to be slightly inclined with respect to the axial direction P. Even if it is slightly inclined, it is difficult to get caught and can return to a state coaxial with the second hole segment 232 under the action of gravity.

[0069] In the embodiment of the present application, the main body 31 and the stopper protrusion 32 are integrally connected to form the sealing member 3. Blocked by the inner wall of the second hole segment 232, the stopper protrusion 32 and the main body 31 cannot move along the radial direction R of the liquid injection hole 23 (that is, it is difficult to displace), and since it is difficult for the stopper protrusion 32 to incline, it is also difficult for the main body 31 to incline, effectively preventing the warping of the main body 31 and ensuring the close contact between the outer peripheral surface of the main body 31 and the hole wall of the first hole segment 231. Thereby, the sealing performance of the liquid injection hole 23 is improved, the problem of liquid leakage of the battery cell 102 is alleviated, and the service life and safety of the battery cell 102 are improved.

[0070] It should be noted that the axial direction P described in the present application refers to the extending direction of the central axis of the electrode terminal 2, and the radial direction R described in the present application refers to the direction perpendicular to the central axis of the electrode terminal 2. In this embodiment, the liquid injection hole 23 is opened coaxially with the electrode terminal 2, that is, the liquid injection hole 23 is located at the axis center of the electrode terminal 2. In other embodiments, the liquid injection hole 23 may not be located at the axis center of the electrode terminal 2, and only the extending direction of the liquid injection hole 23 may be parallel to the axial direction P of the electrode terminal 2.

[0071] In this embodiment, the main body 31 is installed coaxially with the stopper protrusion 32, and the sealing member 3, the electrode terminal 2, and the liquid injection hole 23 are all installed coaxially.

[0072] The connection method between the main body 31 and the electrode terminal 2 has various methods, such as adhesion, welding, etc. Exemplarily, a conductive adhesive is installed and adhered between the first outer peripheral surface 313 of the main body 31 and the hole wall of the first hole segment 231.

[0073] According to some embodiments of the present application, the first outer peripheral surface 313 of the main body 31 is welded to the hole wall of the first hole segment 231.

[0074] The welding method has various methods, such as full penetration welding, heat fusion welding, lap seam welding, etc. Exemplarily, the sealing member 3 is installed in the liquid injection hole 23, the first outer peripheral surface 313 of the main body 31 is in close contact with the hole wall of the first hole segment 231, and lap seam welding is performed at the close contact interface.

[0075] The welding method has the characteristic of high processing speed and can improve production efficiency.

[0076] According to some embodiments of the present application, the second surface 312 includes a central region 3121 and an edge region 3122. The central region 3121 is used for connection to the bus bar component. A first groove 3123 is installed on the second surface 312. The first groove 3123 is installed surrounding the outer periphery of the central region 3121, and the edge region 3122 is installed surrounding the outer periphery of the first groove 3123.

[0077] The bus bar component is a component of the battery 100 for realizing electrical connection (such as parallel or series or series-parallel connection) between a plurality of battery cells 102. Specifically, the bus bar component is can realize the electrical connection of the battery cell 102 by connecting the electrode terminal 2 of the battery cell 102.

[0078] In the above solution, the sealing member 3 is used not only as a component for sealing the liquid injection hole 23, but also for realizing the electrical connection between the electrode terminal 2 and the bus bar component. By providing a first groove 3123 between the central region 3121 and the edge region 3122 of the second surface 312, the edge region 3122 is connected to the first outer peripheral surface 313 of the main body 31, and the first groove 3123 separates the central region 3121 from the edge region 3122. The first groove 3123 is used to release the welding stress between the first outer peripheral surface 313 and the inner wall of the first hole segment 231 so that the central region 3121 does not deform. The central region 3121 is flat, ensuring that a dummy welding phenomenon is less likely to occur during the welding of the central region 3121 and the bus bar component, further ensuring that the connection between the central region 3121 and the bus bar component is stable and reliable, and that the current-carrying capacity is good.

[0079] According to another aspect, by configuring the central region 3121 of the second surface 312 to be connected to the bus bar component, the area of the first end surface 21 of the electrode terminal 2 can be reduced, so that the aperture of the liquid injection hole 23 can be set larger, thereby effectively improving the liquid injection efficiency.

[0080] According to some embodiments of the present application, the projection of the stopper protrusion 32 along the axial direction P onto the second surface 312 is located within the central region 3121.

[0081] Stopper pro Outlet section The position corresponds to the position of the central region 3121, reinforcing the structural strength of the central region 3121 and further playing a role in preventing the deformation of the central region 3121.

[0082] According to some embodiments of the present application, the edge region 3122 is recessed toward the inside of the battery cell 102 along the axial direction P with respect to the central region 3121.

[0083] By setting the edge region 3122 of the main body 31 to be recessed with respect to the adjacent central region 3121, the recess can accommodate the weld joint between the main body 31 and the electrode terminal 2, prevent the weld joint from being higher than the central region 3121 along the axial direction P, play a role in protecting the weld joint, and also avoid the protruding weld joint interfering with the bus bar component, so as not to affect the connection between the bus bar component and the central region 3121.

[0084] According to some embodiments of the present application, the first end face 21 of the electrode terminal 2 is perpendicular to the axial direction P and separated from the inside of the battery cell 102, and the central region 3121 is flush with the first end face 21.

[0085] By setting the central region 3121 to be flush with the first end face 21, the central region 3121 is not higher than the first end face 21 along the axial direction P, does not occupy extra space outside the battery cell 102, and the central region 3121 is not lower than the first end face 21 either. This is advantageous for the close contact between the central region 3121 and the surface of the bus bar component, ensures that the connection between the central region 3121 and the bus bar component is stable and reliable, and enhances the current-carrying capacity.

[0086] According to some embodiments of the present application, the first outer peripheral surface 313 of the main body 31 is a first conical surface whose diameter gradually decreases along the axial direction P in the direction approaching the inside of the battery cell 102, and the hole wall of the first hole segment 231 is a second conical surface that matches the first conical surface.

[0087] As shown in FIG. 7, the shape of the main body 31 is a frustum of a cone, the central axis of the frustum of the cone extends along the axial direction P, the area of the first surface 311 is smaller than the area of the second surface 312, and the fact that the first outer peripheral surface 313 is the first conical surface means that the first outer peripheral surface 313 is a trumpet-shaped curved surface, the small end of the first outer peripheral surface 313 is connected to the first surface 311, and the 1 outer peripheral surface 3 13 large end of is connected to the second surface 312. In the axial direction P, the small end of the first outer peripheral surface 313 is relatively inside the battery cell 102 nearIn addition, the large end of the first outer peripheral surface 313 is relatively outside the battery cell 102. near Yes.

[0088] The fact that the first hole segment 231 is the second conical surface means that the hole wall of the first hole segment 231 is a trumpet-shaped curved surface, the first hole segment 231 is a trumpet-shaped hole, the large end of the first hole segment 231 approaches relatively close to the outside of the battery cell 102, and the small end of the first hole segment 231 approaches relatively close to the inside of the battery cell 102 and is connected to the second hole segment 232.

[0089] By arranging both the outer peripheral surface of the main body 31 and the hole wall of the first hole segment 231 as conical surfaces, the conical surfaces have the role of guiding the seal member 3 into the liquid injection hole 23, facilitating assembly. During laser welding, the second conical surface further shields and reflects the laser propagating along the axial direction P, so as to alleviate the problem that the laser enters the battery cell 102 through the gap between the seal member 3 and the liquid injection hole 23 and does not damage the functional components inside the battery cell 102.

[0090] The matching of the first conical surface and the second conical surface means that the first conical surface and the second conical surface are in close contact. Because the first conical surface and the second conical surface are in close contact, the gap therebetween becomes small, and the laser can be further prevented from being reflected and transmitted between the first conical surface and the second conical surface, thereby further alleviating the problem that the laser enters the battery cell 102 through the gap between the seal member 3 and the liquid injection hole 23.

[0091] In some other embodiments, the shape of the main body 31 may be a frustum of a pyramid. The first surface 311, which is the small bottom surface of the frustum of the pyramid, and the second surface 312, which is the large bottom surface of the frustum of the pyramid, are two opposite bottom surfaces of the frustum of the pyramid. The first outer peripheral surface 313 of the main body 31 is the side surface of the frustum of the pyramid. The internal space of the first hole segment 231 is frustum-of-a-pyramid-shaped and matches the first outer peripheral surface 313 of the first hole segment 231. The hole wall Matches the first outer peripheral surface 313.

[0092] According to some embodiments of the present application, as shown in FIGS. 4, 5, and 6, a second groove 3124 is provided at the center of the second surface 312.

[0093] The central region 3121 is circular, and both the edge region 3122 and the first groove 3123 are annular. The central region 3121, the first groove 3123, and the edge region 3122 are concentrically arranged. The second groove 3124 is provided in the central region 3121 and at the center position of the central region 3121.

[0094] The second groove 3124 can be used as a support position or a marking position for the welding device. The welding device can rotate the welding head once along the outer ring of the edge region 3122 with the second groove 3124 as the fulcrum or the center, and complete the welding of the main body 31 and the electrode terminal 2. By providing the second groove 3124, it plays a role in facilitating welding.

[0095] According to some embodiments of the present application, the second groove 3124 is hemispherical.

[0096] As shown in FIG. 7, the second groove 3124 is hemispherical, the inner wall of the second groove 3124 is spherical, and when the second groove 3124 is used as the support position of the welding device, it is beneficial for the welding device to rotate within the second groove 3124.

[0097] According to some embodiments of the present application, as shown in FIG. 7, the liquid injection hole 23 further includes a third hole segment 233. The third hole segment 233 is closer to the inside of the battery cell 102 than the second hole segment 232. The aperture of the third hole segment 233 is smaller than the aperture of the second hole segment 232, and the stopper protrusion 32 covers the third hole segment 233.

[0098] The first hole segment 231, the second hole segment 232, and the third hole segment 233 are connected in sequence, and their diameters decrease sequentially. The hole wall of the first hole segment 231 and the hole wall of the second hole segment 232 are connected via a transition surface (i.e., the stepped surface 234). The hole wall of the second hole segment 232 and the hole wall of the third hole segment 233 are connected via another transition surface (i.e., the transition connection surface 235). The end of the first hole segment 231 away from the second hole segment 232 extends to the first end face 21, and the end of the third hole segment 233 away from the second hole segment 232 extends to the second end face 22.

[0099] By providing the third hole segment 233, when the electrolyte overflows from the third hole segment 233, the second hole segment 232 can accommodate the overflowed electrolyte, making it difficult for the electrolyte to overflow into the first hole segment 231, effectively alleviating the corrosion of the welding joint by the electrolyte, and improving the sealing effect.

[0100] According to some embodiments of the present application, the third surface 321 faces the transition connection surface 235 with a gap therebetween.

[0101] The third surface 321 faces the inside of the battery cell 102, and the transition connection surface 235 faces the outside of the battery cell 102. The fact that there is a gap between the third surface 321 and the transition connection surface 235 means that the third surface 321 and the transition connection surface 235 do not contact each other and there is a certain distance in the axial direction P.

[0102] By providing a gap between the third surface 321 and the transition connection surface 235, it allows for a certain manufacturing tolerance between the length of the stopper protrusion 32 in the axial direction P and the length of the second hole segment 232, prevents over-positioning, ensures the close contact between the outer peripheral surface of the main body 31 and the hole wall of the first hole segment 231, and ensures that the first surface 311 of the main body 31 can be in close contact with the stepped surface 234 and , thereby improving the sealing performance between the main body 31 and the electrode terminal 2.

[0103] According to some embodiments of the present application, the battery cell 102 further includes an electrode assembly 4. An end facing the wall portion of the electrode assembly 4 forms a first tab 41. The transition connection surface 235 includes a main connection region 2351 and a welding region 2352. The welding region 2352 is used for welding with the first tab 41. The main connection region 2351 is connected to the hole wall of the second hole segment 232, and the welding region 2352 is connected to the hole wall of the third hole segment 233. There is a first gap 2361 between the main connection region 2351 and the third surface 321, and a second gap 2362 between the welding region 2352 and the third surface 321. The second gap 2362 is larger than the first gap 2361.

[0104] The electrode assembly 4 includes a first electrode plate, a second electrode plate, and a separator for separating the first electrode plate and the second electrode plate. The first electrode plate and the second electrode plate have opposite polarities. In other words, one of the first electrode plate and the second electrode plate is a positive electrode plate, and the other of the first electrode plate and the second electrode plate is a negative electrode plate. The first electrode plate, the second electrode plate, and the separator are prior arts and are not shown in the drawings of the specification of the present application, but those skilled in the art should understand their specific structures. The first tab 41 and the second tab 42 may extend from the same side of the electrode assembly 4, or may extend from opposite sides respectively. Exemplarily, as shown in FIGS. 5 and 8, the first tab 41 and the second tab 42 are respectively located at both ends of the electrode assembly 4. One end of the electrode assembly 4 having the first tab 41 faces the wall portion, and one end of the electrode assembly 4 having the second tab 42 faces away from the wall portion. That is, in this embodiment, the end of the electrode assembly 4 having the first tab 41 faces the bottom wall 11, and the end of the electrode assembly 4 having the second tab 42 faces the end cap 13. The first tab 41 is electrically connected to the electrode terminal 2, and the second tab 42 is electrically connected to the end cap 13. The electrical connection method may be contact conduction, connection by a conductive adhesive, direct welding or indirect welding.

[0105] Taking the indirect welding between the first tab 41 and the electrode terminal 2 as an example, as shown in FIG. 8, the battery cell 102 further includes a first adapter 5 welded to the first tab 41. After the electrode assembly 4 is housed in the housing 1, the first adapter 5 contacts the second end face 22 of the electrode terminal 2, and by operating the welding head of the welding device on the welding region 2352, the electrode terminal 2 and the first adapter 5 are welded to realize the electrical connection between the first tab 41 and the electrode terminal 2.

[0106] Since the second gap 2362 is larger than the first gap 2361, the welding region 2352 is recessed toward the inside of the battery cell 102 along the axial direction P with respect to the main body region 2351, and the welding region 2352 is further away from the third surface 321 of the stopper protrusion Outlet section so that the weld seam formed in the welding region 2352 retracts from the stopper protrusion, does not affect the positioning accuracy of the sealing member 3, and guarantees the sealing performance of the sealing member 3.

[0107] In some embodiments, the battery cell 102 further includes a second adapter 6 welded to the second tab 42. After the electrode assembly 4 is housed in the housing 1, the second adapter 6 contacts conductive contact make it, or or welds to the end cap 13.

[0108] According to a second aspect, as shown in FIG. 2, embodiments of the present application provide a battery 100 including at least one battery cell 102 described in each of the above aspects. The battery 100 according to the embodiments of the present application has good sealing performance of the battery cell 102, is less likely to leak liquid, and has a long service life and high safety of the battery 100.

[0109] According to a third aspect, embodiments of the present application may be the vehicle 1000 shown in FIG. 1, but are not limited thereto, and provide a power-consuming device including the above-described battery 100. The battery 100 of the power-consuming device has a long service life and high safety, the power-consuming device has good durability, and can be used safely.

[0110] According to the fourth aspect, an embodiment of the present application provides a method for manufacturing a battery cell 102. As shown in FIG. 9, the manufacturing method includes:

[0111] Step S1 of providing a housing 1 including a wall portion;

[0112] Step S2 of providing an electrode terminal 2, the electrode terminal 2 having a liquid injection hole 23 penetrating along its axial direction P, the liquid injection hole 23 including a first hole segment 231 and a second hole segment 232, and the aperture of the second hole segment 232 being smaller than the aperture of the first hole segment 231;

[0113] Step S3 of providing a sealing member 3, the sealing member 3 including a main body 31 and a stopper protrusion 32, the main body 31 including opposing first and second surfaces 311 and 312, and the stopper protrusion 32 being formed on the first surface 311;

[0114] Step S4 of installing the electrode terminal 2 on the wall portion such that the second hole segment 232 is closer to the inside of the battery cell 102 than the first hole segment 231, sealingly fitting the main body 31 into the first hole segment 231, and fitting the stopper protrusion 32 into the second hole segment 232 to seal the liquid injection hole 23 with the sealing member 3.

[0115] It should be noted that for the structure related to the battery cell 102 manufactured by the above method for manufacturing the battery cell 102, reference can be made to the battery cell 102 provided by each of the above embodiments.

[0116] When assembling the battery cell 102 based on the above method for manufacturing the battery cell 102, it is not necessarily required to sequentially perform the above steps. That is, the steps may be executed according to the order mentioned in the embodiment, or the steps may be executed in an order different from the order mentioned in the embodiment, or multiple steps may be executed simultaneously. For example, steps S1, S2, and S3 may be executed in a random order or simultaneously.

[0117] According to the fifth aspect, an embodiment of the present application provides manufacturing equipment 7 for a battery cell 102. As shown in FIG. 10, the manufacturing equipment 7 includes a first providing device 71, a second providing device 72, a third providing device 73, and an assembling device 74.

[0118] The first providing device 71 is used to provide a housing 1 including a wall portion.

[0119] The second providing device 72 is used to provide an electrode terminal 2 having a liquid injection hole 23 penetrating along its axial direction P. The liquid injection hole 23 includes a first hole segment 231 and a second hole segment 232 smaller in hole diameter than the first hole segment 231.

[0120] The third providing device 73 is used to provide a sealing member 3. The sealing member 3 includes a main body 31 and a stopper protrusion 32. The main body 31 includes a first surface 311 and a second surface 312 facing each other. The stopper protrusion 32 is formed on the first surface 311.

[0121] The assembling device 74 is used to install the electrode terminal 2 on the wall portion such that the second hole segment 232 is closer to the inside of the battery cell 102 than the first hole segment 231, and to seal and fit the main body 31 into the first hole segment 231 and fit the stopper protrusion 32 into the second hole segment 232 to seal the liquid injection hole 23 with the sealing member 3.

[0122] For the related structure of the battery cell 102 manufactured by the above manufacturing equipment 7, reference can be made to the battery cell 102 according to each of the above embodiments.

[0123] It should be noted that, without contradiction, the embodiments and features in the embodiments of the present application can be combined with each other.

[0124] According to some embodiments of the present application, referring to FIGS. 3 to 8, an embodiment of the present application provides a cylindrical battery cell 102, and the battery cell 102 includes a housing 1, an electrode assembly 4, an electrode terminal 2, and a sealing member 3. The housing 1 includes a case and an end cap 13. The case includes a side wall 12 and a bottom wall 11. The side wall 12 is installed surrounding the bottom wall 11. One end of the side wall 12 is connected to the bottom wall 11, and the other end of the side wall 12 surrounds an opening facing the bottom wall 11. The end cap 13 covers the opening to form an accommodation space. The electrode assembly 4 is installed in the accommodation space of the housing 1. The electrode assembly 4 respectively forms a first tab 41 and a second tab 42 along both ends in the axial direction P. One end of the electrode assembly 4 having the first tab 41 faces the bottom wall 11, and one end of the electrode assembly 4 having the second tab 42 faces the end cap 13. The electrode terminal 2 is insulated and attached to the bottom wall 11, that is, a sealing ring made of an insulating material is installed between the electrode terminal 2 and the bottom wall 11. The electrode terminal 2 is electrically connected to the first tab 41, and the end cap 13 is electrically connected to the second tab 42 to realize outputting or inputting the electrical energy of the battery cell. The electrode terminal 2 has a liquid injection hole 23 penetrating along its axial direction P, and the liquid injection hole 23 is used for injecting liquid into the battery cell 102 (that is, the accommodation space of the housing 1). The liquid injection hole 23 includes a first hole segment 231 and a second hole segment 232. The second hole segment 232 is closer to the inside of the battery cell 102 than the first hole segment 231, and the aperture of the second hole segment 232 is smaller than the aperture of the first hole segment 231. The sealing member 3 is used for sealing the liquid injection hole 23. The sealing member 3 includes a main body 31 and a stopper protrusion 32. The main body 31 is hermetically fitted to the first hole segment 231, and the main body 31 includes a first surface 311 facing the inside of the battery cell 102 and a second surface 312 facing away from the inside of the battery cell 102 that face each other along the axial direction P. The stopper protrusion 32 is formed on the first surface 311 and fitted to the second hole segment 232.The battery cell 102 according to the embodiment of the present application has its liquid injection hole 23 installed at the electrode terminal 2, eliminating the need to additionally drill holes in the housing 1, effectively improving the structural strength of the housing 1, making the housing 1 less likely to deform. The thickness of the electrode terminal 2 is greater than that of the housing 1. When the liquid injection hole 23 is blocked, the electrode terminal 2 is also less likely to deform. Also, blocked by the inner wall of the second hole segment 232, the stopper protrusion 32 and the main body 31 are less likely to be displaced or tilted, effectively preventing the warping of the main body 31 and ensuring the close contact between the outer peripheral surface of the main body 31 and the hole wall of the second hole segment 232. Thereby, the sealing performance of the liquid injection hole 23 is improved from multiple aspects, alleviating the liquid leakage problem of the battery cell 102 and realizing the improvement of the service life and safety of the battery cell 102.

[0125] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, various changes and modifications are possible to the present application. All modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the protection scope of the present application.

Description of Reference Numerals

[0126] 1000 - Vehicle, 100 - Battery, 200 - Motor, 300 - Controller, 101 - Housing, 1011 - First housing part, 1012 - Second housing part, 102 - Battery cell, 1 - Housing, 11 - Bottom wall, 12 - Side wall, 13 - End cap, 2 - Electrode terminal, 21 - First end face, 22 - Second end face, 23 - Liquid injection hole, 231 - First hole segment, 232 - Second hole segment, 233 - Third hole segment, 234 - Step surface, 235 - Transition connection surface, 2351 - Main body region, 2352 - Welding region, 2361 - First gap, 2362 - Second gap, 3 - Seal member, 31 - Main body, 311 - First surface, 312 - Second surface, 3121 - Central region, 3122 - Edge region, 3123 - First groove, 3124 - Second groove, 313 - First outer peripheral surface, 32 - Stopper protrusion, 321 - Third surface, 322 - Second outer peripheral surface, 4 - Electrode assembly, 41 - First tab, 42 - Second tab, 5 - First adapter, 6 - Second adapter, 7 - Manufacturing equipment, 71 - First providing device, 72 - Second providing device, 73 - Third providing device, 74 - Assembly device, P - Axial direction, R - Radial direction.

Claims

1. A battery cell, comprising: A housing including a wall portion; and An electrode terminal installed on the wall portion, the electrode terminal having a liquid injection hole penetrating along its axial direction, the liquid injection hole including a first hole segment and a second hole segment, the second hole segment approaching the inside of the battery cell more than the first hole segment, and the aperture diameter of the second hole segment being smaller than the aperture diameter of the first hole segment; and A seal member for sealing the liquid injection hole, the seal member including a main body and a stopper protrusion, the main body being sealingly fitted into the first hole segment, the main body including a first surface facing the inside of the battery cell and a second surface facing away from the inside of the battery cell, which are opposed to each other along the axial direction, and the stopper protrusion being formed on the first surface and including a seal member that fits with the second hole segment; The main body further includes an outer peripheral surface connecting the first surface and the second surface, which is welded to the hole wall of the first hole segment; The second surface includes a central region connected to a bus bar component and an edge region, a first groove is installed on the second surface, the first groove is installed surrounding the outer periphery of the central region, and the edge region is installed surrounding the outer periphery of the first groove. A battery cell.

2. The battery cell according to claim 1, wherein the projection of the stopper protrusion onto the second surface along the axial direction is located within the central region.

3. The battery cell according to claim 1 or 2, wherein the edge region is recessed toward the inside of the battery cell along the axial direction with respect to the central region.

4. The battery cell according to any one of claims 1 to 3, wherein the electrode terminal includes a first end face perpendicular to the axial direction and facing away from the inside of the battery cell, and the central region is flush with the first end face.

5. The battery cell according to any one of claims 1 to 4, wherein the outer peripheral surface is a first conical surface whose diameter gradually decreases in a direction approaching the inside of the battery cell along the axial direction, and the hole wall of the first hole segment is a second conical surface that matches the first conical surface.

6. The battery cell according to any one of claims 1 to 5, wherein a second groove is installed at the center of the second surface.

7. The battery cell according to claim 6, wherein the second groove is hemispherical.

8. The liquid injection hole further includes a third hole segment, the third hole segment approaches the inside of the battery cell closer than the second hole segment, the hole diameter of the third hole segment is smaller than the hole diameter of the second hole segment, and the stopper protrusion covers the third hole segment. The battery cell according to any one of claims 1 to 7.

9. The stopper protrusion includes a third surface on which the stopper protrusion faces the inside of the battery cell along the axial direction. A transition connection surface is formed between the hole wall of the second hole segment and the hole wall of the third hole segment. The transition connection surface faces the third surface and there is a gap. The battery cell according to claim 8.

10. The battery cell further includes an electrode assembly. An end facing the wall portion of the electrode assembly forms a first tab. The transition connection surface includes a main body region to be connected and a welding region. The welding region is used for welding with the first tab. The main body region is connected to the hole wall of the second hole segment. The welding region is connected to the hole wall of the third hole segment. There is a first gap between the main body region and the third surface, and there is a second gap larger than the first gap between the welding region and the third surface. The battery cell according to claim 9.

11. A battery including the battery cell according to any one of claims 1 to 10.

12. An electric power consuming device including the battery according to claim 11.

13. A method for manufacturing a battery cell, providing a housing including a wall portion; providing an electrode terminal having a liquid injection hole penetrating along its axial direction, the liquid injection hole including a first hole segment and a second hole segment smaller than the hole diameter of the first hole segment; providing a seal member including a main body including a first surface and a second surface facing each other, and a stopper protrusion formed on the first surface; installing the electrode terminal on the wall portion so that the second hole segment approaches the inside of the battery cell closer than the first hole segment, sealingly fitting the main body to the first hole segment, and fitting the stopper protrusion to the second hole segment, and sealing the liquid injection hole with the seal member; The main body further includes an outer peripheral surface connecting the first surface and the second surface, which is welded to the hole wall of the first hole segment. The manufacturing method of a battery cell, wherein the second surface includes a central region connected to a bus bar component and an edge region, a first groove is provided on the second surface, the first groove is provided so as to surround the outer periphery of the central region, and the edge region is provided so as to surround the outer periphery of the first groove.

14. Manufacturing equipment for a battery cell, comprising: A first providing device for providing a housing including a wall portion; A second providing device used for providing an electrode terminal, the electrode terminal having a liquid injection hole penetrating along its axial direction, the liquid injection hole including a first hole segment and a second hole segment smaller in hole diameter than the first hole segment; A third providing device for providing a sealing member including a main body including a first surface and a second surface facing each other and a stopper protrusion formed on the first surface; An assembling device used for installing the electrode terminal on the wall portion so that the second hole segment is closer to the inside of the battery cell than the first hole segment, sealingly fitting the main body to the first hole segment, and sealing the liquid injection hole with the sealing member so that the stopper protrusion is fitted to the second hole segment; The main body further includes an outer peripheral surface connecting the first surface and the second surface, which is welded to the hole wall of the first hole segment; Manufacturing equipment for a battery cell, wherein the second surface includes a central region connected to a bus bar component and an edge region, a first groove is provided on the second surface, the first groove is provided so as to surround the outer periphery of the central region, and the edge region is provided so as to surround the outer periphery of the first groove.

Images