WO2023133851A1

WO2023133851A1 - Battery cell, battery, electric device, and method and device for manufacturing battery cell

Info

Publication number: WO2023133851A1
Application number: PCT/CN2022/072159
Authority: WO
Inventors: 柴志生; 邹洋; 迟庆魁; 余文杰; 金海族
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2023-07-20
Also published as: CN117203805A

Abstract

The present application relates to a battery cell, a battery, an electric device, and a method and device for manufacturing a battery cell. The battery cell comprises: an electrode component, which comprises a first tab and a second tab which are opposite in polarity, the first tab and the second tab respectively being located at two ends of the electrode component, and the electrode component being provided with a winding centre hole; a shell component, which comprises a first electrode lead-out part and a second electrode lead-out part which are used for inputting or outputting electrical energy, the electrode component being arranged in the shell component, the first electrode lead-out part and the second electrode lead-out part both being arranged on the side of the shell component close to the first tab, the first electrode lead-out part being electrically connected to the first tab, and the second electrode lead-out part being provided with an electrolyte injection hole for injecting an electrolyte into the battery cell; and an adapter, which is tubular and passes through the winding centre hole. One end of the adapter is connected to the second tab; and the other end of the adapter extends into the electrolyte injection hole, and an outer circumferential surface of the adapter is connected to an inner circumferential surface of the electrolyte injection hole, so as to realise an electrical connection between the second tab and the second electrode lead-out part.

Description

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

technical field

The present application relates to the field of battery technology, in particular, to a battery cell, a battery, an electrical device, and a method and device for manufacturing the battery cell.

Background technique

In the environment of pursuing energy saving and emission reduction, batteries are widely used in electrical equipment. With the development of technology, higher requirements are put forward for the structure of batteries. The structure of batteries tends to be more compact in order to reduce their power consumption. The space occupied in the equipment, however, the reduction of space is likely to lead to safety issues such as overlapping short circuits of components and inconvenient assembly problems.

Contents of the invention

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 facilitate assembly, while improving the safety of the battery.

The embodiment of the application is realized like this:

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

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 central hole ;

The shell assembly includes a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the inside of the shell assembly is provided with the electrode assembly, the first electrode lead-out portion and the second electrode lead-out portion The parts are all arranged on the side of the shell assembly close to the first tab, the first electrode lead-out part is electrically connected to the first tab, and the second electrode lead-out part is provided for connecting to the battery. The liquid injection hole for injecting electrolyte into the inside of the monomer;

An adapter, the adapter is tubular and pierced 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 injector The outer peripheral surface of the liquid hole is connected to the inner peripheral surface of the liquid injection hole, so as to realize the electrical connection between the second tab and the second electrode lead-out part.

In the battery cell provided by this application, under the overall arrangement of the shell assembly, the electrode assembly, and the adapter, the distance between the first tab and the second tab is relatively far away, and it is not easy to overlap each other to cause a short circuit, and the safety is high; The 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; and the liquid injection and opening formation are realized through the second electrode lead-out part and the adapter, without the need for shell assembly In addition, a liquid injection hole is provided to further simplify the structure of the battery cell; and, the end of the adapter extends into the liquid injection hole, which avoids the limitation of the inner space of the shell assembly on the adapter, and the adapter and the second electrode The connection of the lead-out part is not affected by the length of the adapter, the manufacturing accuracy of the adapter is lowered, it is easier to manufacture and assemble, and it is also possible to connect the adapter and the second electrode lead-out part in an externally visible state, The connection quality between the adapter piece and the lead-out part of the second electrode is improved, the connection strength is high, and the flow-through capacity is good.

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

In the above technical solution, the adapter and the second electrode lead-out part can be connected in an externally visible state, the processing speed is fast, and the phenomenon of virtual welding can be reduced to ensure the welding quality, so that the adapter and the second electrode lead-out part The connection is stable and the overcurrent capability is good.

In one embodiment of the present application, the outer peripheral surface of one 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 The face matches the second conical face.

In the above technical solution, through the cooperation of the first conical surface and the second conical surface, the effect of guiding the centering of the adapter can be achieved, and the outer peripheral surface of the adapter and the inner peripheral surface of the liquid injection hole can be bonded to avoid the occurrence of Weld problem.

In an embodiment of the present application, the diameter of the first conical surface gradually decreases toward the direction away from the interior of the battery cell.

In the above technical solution, the larger end of the first conical surface and the second conical surface may face the interior of the battery cell, and the smaller end may face the exterior of the battery cell. On the one hand, it is convenient to connect the electrode assembly with the adapter first. Put it into the shell together with the electrode assembly and then extend into the liquid injection hole and complete the connection; on the other hand, due to manufacturing errors, the outer peripheral surface of the extending end of the adapter is not necessarily equal in height, by setting the outer peripheral surface of the adapter to face The first conical surface gradually decreases in the direction away from the inside of the battery cell. When assembling, the first conical surface and the second conical surface are pressed against each other so that the higher position of the outer peripheral surface exceeds the liquid injection hole, ensuring a relatively tight outer peripheral surface. The low position is flush with the end edge of the liquid injection hole to avoid false welding. That is to say, through the above-mentioned settings, it is possible to first connect one end of the adapter hidden inside the battery cell, and then connect the other end of the adapter that is visible from the outside, so as to ensure a stable connection between the second electrode lead-out part and the second tab. Improve the welding yield of adapters and liquid injection holes.

In one embodiment of the present application, the battery cell further includes a seal, the seal is used to close the liquid injection hole, and the seal and the adapter extend into the liquid injection hole One end of the opposite set.

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

In an embodiment of the present application, the liquid injection hole includes a first hole segment and a second hole segment, and the second hole segment is closer to the inside of the battery cell than the first hole segment, so The aperture diameter of the second hole section is smaller than the aperture diameter 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 on the first hole section .

In the above technical solution, the connection interface between the adapter piece and the second hole section is located between the axis and the inner wall of the first hole section, and the first hole section provides a large space for welding operation, which is convenient for welding. At the same time, the connection interface between the adapter piece and the second hole section, and the channel on the adapter piece are all covered by the sealing piece, so as to ensure a better sealing effect.

In an embodiment of the present application, the battery cell further includes a current collector, the current collector is attached to the second tab, and is used to connect the second tab to the adapter part, so as to realize the electrical connection between the second tab and the adapter part.

In the above technical solution, by providing the current collecting piece, more areas of the second tab are directly connected to the current collecting piece, which improves the connection strength and the flow area, so that the battery cell has a higher flow flow capacity.

In an embodiment of the present application, the current collecting piece covers one end of the electrode assembly having the second tab, and the end of the adapter piece away from the liquid injection hole is connected to the current collecting piece. A first through hole is formed on the collecting piece, and the first through hole corresponds to the internal space position of the adapter piece.

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 The overcurrent can be passed through the current collector to avoid polarization problems and further improve the overcurrent capability. On the other hand, the electrolyte can flow to the other end of the battery cell by setting the first through hole through the current collector and communicating with the inner space of the tubular adapter, so that the inside of the shell assembly can be quickly filled with electrolyte from bottom to top, Improve the infiltration effect and infiltration rate of the electrolyte.

In an embodiment of the present application, the collector is formed with a plurality of second through holes, and the positions of the second through holes are staggered from those of the inner space of the adapter.

In the above technical solution, the electrolyte flows from the second through hole to the end of the electrode assembly. In this direction, the electrolyte is less hindered and can quickly enter the gap between the pole pieces, thereby improving the impact of the electrolyte on the inside of the electrode assembly. The infiltration rate and infiltration effect.

In one 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. , the first through hole is disposed on the bottom wall of the groove.

In the above technical solution, the first groove communicates the central area and the edge area of the current collector, thereby forming a channel for flowing the electrolyte between the current collector and the electrode assembly, and the first groove passes through the electrode assembly. The gap between any two adjacent pole pieces ensures the infiltration effect and infiltration rate of the electrolyte.

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

In the above technical solution, by providing the second groove on the side of the current collector away from the second tab, the second groove marks the welding area, so as to facilitate welding.

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

In the above technical solution, the protrusion can be embedded in the second pole lug to ensure full contact between the protrusion and the second pole lug, and at the same time the second groove corresponds to the position of the protrusion, so as to avoid welding the second groove and the second pole There is a gap between the ears to avoid solder joint problems.

In a second aspect, an embodiment of the present application provides a battery, which includes the foregoing battery cells.

In the battery provided by the present application, the confluence part only needs to occupy one side of the battery cell in the height direction, the overall structure of the battery is compact, and the battery has good safety and is easy to assemble.

In a third aspect, an embodiment of the present application provides an electric device, which includes the aforementioned battery.

The electric equipment provided by the application has the advantages of small space occupied by the battery, high safety and convenient assembly, which is beneficial to the miniaturization of the electric equipment.

In a fourth aspect, the embodiment of the present application provides a method for manufacturing a battery cell, including:

An electrode assembly is provided, 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 two ends of the electrode assembly, the electrode assembly having a winding center hole; providing a housing assembly comprising a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electrical energy, the first electrode lead-out portion and the second electrode lead-out portion being both Located on the same side of the shell assembly, the second electrode lead-out part is provided with a liquid injection hole for injecting electrolyte into the battery cell; an adapter is provided, and the adapter is tubular; The adapter piece is passed through the winding center hole, and one end of the adapter piece is connected to the second tab; the adapter piece and the electrode assembly are put into the shell assembly, so that both the first electrode lead-out part and the second electrode lead-out part are arranged on the side of the housing component close to the first tab, and the first pole lead and the first electrode lead-out part Electrically connected, and the other end of the adapter is inserted into the liquid injection hole and the outer peripheral surface is connected to the inner peripheral surface of the liquid injection hole, so as to realize the extraction of the second tab and the second electrode Electrical connection of the part.

In the fifth aspect, the embodiment of the present application provides a battery cell manufacturing equipment, which includes:

The first providing device is used to provide an electrode assembly, the electrode assembly includes a first tab and a second tab with opposite polarities, and the first tab and the second tab are respectively located on the electrode assembly At both ends, the electrode assembly has a winding central hole; the second providing device is used to provide a casing assembly, and the casing assembly includes a first electrode lead-out part and a second electrode lead-out part for inputting or outputting electric energy, the Both the first electrode lead-out part and the second electrode lead-out part are arranged on the same side of the shell assembly, and the second electrode lead-out part is provided with a liquid injection hole for injecting electrolyte solution into the battery cell; The third provision device is used to provide an adapter, and the adapter is tubular; the first assembly device is used to pass the adapter through the winding center hole, and place the adapter One end is connected to the second tab; the second assembly device is used to put the adapter and the electrode assembly into the shell assembly, so that the first electrode lead-out part and the second electrode The lead-out parts are all located on the side of the shell component close to the first tab, electrically connect the first tab with the first electrode lead-out part, and extend the other end of the adapter into the The liquid injection hole and the outer peripheral surface is connected to the inner peripheral surface of the liquid injection hole, so as to realize the electrical connection between the second tab and the second electrode lead-out part.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that are required 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 It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of a vehicle provided by an embodiment of the present application;

Fig. 2 is an exploded view of a battery provided by an embodiment of the present application;

Fig. 3 is an exploded view of a battery cell provided by an embodiment of the present application;

Fig. 4 is a front view of a battery cell provided by an embodiment of the present application;

FIG. 5 is a cross-sectional view of a battery cell provided by an embodiment of the present application;

Fig. 6 is a partial enlarged view of the second electrode lead-out part and the adapter provided by an embodiment of the present application;

Fig. 7 is a partial enlarged view of the second electrode lead-out part and the adapter provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a welding state of a battery cell provided by an embodiment of the present application;

Fig. 9 is an exploded view of an adapter, a second electrode lead-out part and a sealing member provided by an embodiment of the present application;

Fig. 10 is a partial enlarged view of an adapter, a current collector and a second tab provided by an embodiment of the present application;

Fig. 11 is a perspective view of an adapter and a current collector provided by an embodiment of the present application;

Fig. 12 is a schematic diagram of the side of the current collector away from the electrode assembly provided by an embodiment of the present application;

FIG. 13 is a schematic flowchart of a method for manufacturing a battery cell provided by an embodiment of the present application;

Fig. 14 is a schematic block diagram of a manufacturing device for a battery cell provided by an embodiment of the present application.

Icons: 1000-vehicle; 100-battery; 200-motor; 300-controller; 101-box; 1011-first box; 1012-second box; 102-battery unit; 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; -first hole section; 221b-second hole section; 2211-inner peripheral surface; 23-bottom wall; 24-side wall; 25-end cover; 26-seal; 3-transfer piece; 31-outer peripheral surface; 4-collector; 41-first through hole; 42-second through hole; 43-first groove; 44-second groove; 51-first insulating member; 52-second insulating member; 6- 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 ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is just an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: there is A, A and B exist at the same time, and B exists These three situations. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

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

"Plurality" in this application refers to two or more (including two).

In this application, the battery cells may include 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. The embodiment of the present application does not limit this.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes an electrode assembly and an electrolyte (such as electrolyte), and the electrode assembly includes a positive pole piece, a negative pole piece and a separator. A battery cell works primarily by moving metal ions between the positive and negative pole pieces. The positive electrode sheet 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 collector and a positive electrode lug protruding from the positive electrode current collector. part is coated with a positive electrode active material layer, and at least part of the positive electrode tab is not coated with a positive electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab protruding from the negative electrode current collector, and the negative electrode current collector part is coated with a negative electrode active material layer, and at least part of the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon. The material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).

The battery cell also includes a casing assembly, and the inside of the casing assembly forms an accommodating space for accommodating electrode assemblies, electrolytes and other functional components, so as to realize electrochemical reactions in the accommodating space. The shell assembly also includes an electrode lead-out part, the electrode lead-out part includes a positive electrode lead-out part and a negative electrode lead-out part, the positive electrode lead-out part is connected to the positive pole lug, and the negative electrode lead-out part is connected to the negative pole lug, so as to realize the electric energy output or input of the battery cell .

A sealable liquid injection hole also needs to be provided on the casing assembly, for injecting electrolyte into the containing space after the electrode assembly and other functional components are installed. The battery cell needs to be charged and discharged for the first time before leaving the factory. Gas will be generated during the formation. The liquid injection hole can also be used to discharge the gas after the formation to reduce the internal pressure of the battery cell (that is, the opening formation) to ensure safety. .

In the battery, it also includes a confluence part, which is used to connect the electrode lead-out parts of the battery cells, and multiple battery cells are connected in parallel, series or mixed through the confluence part.

In the environment of pursuing energy saving and emission reduction, batteries are widely used in electrical equipment. With the development of technology, higher requirements are put forward for the structure of batteries. The structure of batteries tends to be more compact in order to reduce their power consumption. The space occupied in the device.

In the battery, the battery cell and the confluence parts connected to the battery cell occupy most of the space. How to reduce the space occupation while realizing the necessary functions, and avoid the inconvenience of the various components inside the battery cell due to the reduction of space? The problem of connecting and being easy to overlap and short circuit is one of the important research and development directions in this field.

On this basis, in order to reduce space occupation and facilitate the assembly of battery cells while ensuring safety, the present application provides a solution. The electrode assembly has a winding center hole, and the two ends of the electrode assembly are respectively provided with first electrodes with opposite polarities. The pole lug and the second pole lug, the shell assembly includes a first electrode lead-out part and a second electrode lead-out part both arranged on a side close to the first pole lug, wherein the first electrode lead-out part is electrically connected to the first pole lug, and the second electrode lead-out part is electrically connected to the first pole lug. The lead-out part of the two electrodes is provided with a liquid injection hole for injecting liquid electrolyte into the battery cell; the battery cell also includes an adapter, which is tubular and pierced through the center hole of the winding, and one end of the adapter is connected to the For the second tab, 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, so as to realize the electrical connection between the second tab and the second electrode lead-out part.

On the one hand, the first electrode lead-out part and the second electrode lead-out part with opposite polarities are arranged on the same side of the shell assembly, and the first pole lug and the second pole lug are arranged at both ends of the electrode assembly, and the set The adapter is matched with the shell assembly, so that the distance between the first tab and the second tab is relatively long. When the first tab and the second tab are deformed, it is not easy to overlap each other and cause a short circuit. The safety of the battery cell is higher. And realize the input and output of electric energy on the same side of the battery cell, so as to connect the confluence component on the same side of the battery cell, reduce the space occupation, and make the structure of the battery more compact.

On the other hand, liquid injection and opening formation are realized through the second electrode lead-out part and the adapter piece, and there is no need to provide another liquid injection hole on the shell assembly, further simplifying the structure of the battery cell. Moreover, the end of the adapter extends into the liquid injection hole, which avoids the limitation of the inner space of the shell assembly on the adapter, and does not cause the problem that the length of the adapter is too small to connect the lead-out part of the second electrode. There will be a problem that the length of the adapter is too large to be assembled in the shell assembly. The connection between the adapter and the lead-out part of the second electrode is not affected by the length of the adapter, and the manufacturing accuracy of the adapter is lowered. It is convenient for manufacturing and assembly, and it also realizes the connection between the adapter and the second electrode lead-out part in an externally visible state, which improves the connection quality between the adapter part and the second electrode lead-out part, with high connection strength and good flow-through capacity .

To sum up, the battery cell provided by this application not only has high safety and compact structure under the overall arrangement of the shell assembly, electrode assembly and adapter, but also can realize liquid injection and opening formation, and is easy to assemble and prevent overcurrent Good ability.

For the convenience of description, the following embodiments will be described by taking the electric device as a vehicle as an example.

As shown in Figure 1, Figure 1 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, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or Extended range cars, etc. A battery 100 , a controller 300 and a motor 200 may be provided inside the vehicle 1000 , and the controller 300 is used to control the battery 100 to supply power to the motor 200 . For example, the battery 100 may be provided at the bottom or front or rear of the vehicle 1000 . The battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 , for a circuit system of the vehicle 1000 , for example, for starting, navigating, and working power requirements of the vehicle 1000 . In another embodiment of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1000 .

In order to meet different power requirements, as shown in FIG. 2 , the battery 100 may include a plurality of battery cells 102, wherein the plurality of battery cells 102 may be connected in series or in parallel or in combination. the mix of. The battery 100 may also be called a battery 100 pack. Optionally, a plurality of battery cells 102 may be connected in series, parallel or mixed to form a battery module, and then a plurality of battery modules may be connected in series, parallel or mixed to form the battery 100 . That is to say, a plurality of battery cells 102 can directly form the battery 100 , or can first form a battery module, and then the battery module can form the battery 100 .

The battery 100 may further include a box body 101 (or called a cover body), and an accommodation space is formed inside the box body 101 , and a plurality of battery cells 102 are accommodated in the box body 101 . The box body 101 may include two parts for accommodating (refer to FIG. 2 ), which are referred to here as the first box body part 1011 and the second box body part 1012 respectively, and the first box body part 1011 and the second box body part 1012 snap together. The shapes of the first box part 1011 and the second box part 1012 may be determined according to the combined shape of the plurality of battery cells 102 , and each of the first box part 1011 and the second box part 1012 may have an opening. For example, both the first box body part 1011 and the second box body part 1012 can be hollow cuboids and each has only one face as an opening surface, the opening of the first box body part 1011 and the opening of the second box body part 1012 are arranged oppositely, and The first box body part 1011 and the second box body part 1012 are buckled together to form the box body 101 with a closed cavity. Among the first box part 1011 and the second box part 1012, one may also be a cuboid with an opening, and the other may be a cover structure to close the opening of the cuboid. A plurality of battery cells 102 are combined in parallel, in series or in parallel and placed in the box 101 formed by fastening the first box part 1011 and the second box part 1012 .

Optionally, the battery 100 may also include other structures. For example, the battery 100 may further include a confluence component (not shown in the figure), which is used to realize electrical connection between a plurality of battery cells 102 , such as parallel connection, series connection or mixed connection. Specifically, the bus component can realize the electrical connection between the battery cells 102 by connecting the electrode terminals of the battery cells 102 . Further, the bus member may be fixed to the electrode terminal of the battery cell 102 by welding. The electric energy of the plurality of battery cells 102 can be further drawn out through the casing 101 through the conductive mechanism. Optionally, the conduction means can also belong to the current-collecting part.

The following describes in detail any one battery cell 102 , as shown in FIG. 3 , FIG. 4 and FIG. 5 , the battery cell 102 includes an electrode assembly 1 , a casing assembly 2 and an adapter 3 . 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 two ends of the electrode assembly 1 . 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. The inside of the shell assembly 2 is provided with an electrode assembly 1, and the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are both Located on the side of the housing assembly 2 close to the first tab 11, the first electrode lead-out portion 21 is electrically connected to the first tab 11, and the second electrode lead-out portion 22 is provided with a nozzle for injecting electrolyte solution into the battery cell 102. Liquid hole 221 . The adapter piece 3 is tubular and pierced through the winding center hole 13. One end of the adapter piece 3 is connected to the second tab 12, and the other end of the adapter piece 3 extends into the liquid injection hole 221 and the outer peripheral surface 31 is in contact with the liquid injection hole. The inner peripheral surface 2211 of 221 is connected to realize the electrical connection between the second tab 12 and the second electrode lead-out part 22 .

The electrode assembly 1 includes a first pole piece, a second pole piece and a spacer, and the spacer is used to separate the first pole piece from the second pole piece. The polarity of the first pole piece and the second pole piece is opposite, in other words, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece pole piece. The first pole piece, the second pole piece, and the spacer are prior art. Although not shown in the drawings of this application specification, those skilled in the art should understand their specific structures. The first tab 11 is the part of the first pole piece that is not coated with the active material layer, and the second tab 12 is the part of the second pole piece that is not coated with the active material layer. In other words, the first tab 11 and the second pole piece One of the tabs 12 is a positive tab, and the other of the first tab 11 and the second tab 12 is a negative tab. As shown in FIG. 3 , in this application, the electrode assembly 1 is a winding structure with a winding center hole 13 , and the first tab 11 and the second tab 12 are respectively located at the ends of the electrode assembly 1 along the winding center hole 13 . Both ends of the extension direction.

The inside of the case assembly 2 forms a space for accommodating the electrode assembly 1 . The shape of the shell assembly 2 can be determined according to the specific shape of the electrode assembly 1 . For example, if the electrode assembly 1 has a cylindrical structure, the shell assembly 2 may be a cylinder; if the electrode assembly 1 has a cuboid structure, the shell assembly 2 may be a cuboid. Optionally, both the electrode assembly 1 and the shell assembly 2 are cylinders.

The shell assembly 2 includes a bottom wall 23, a side wall 24 and an end cover 25. The side wall 24 is surrounded by the bottom wall 23, and one end of the side wall 24 is connected with the bottom wall 23, and the other end of the side wall 24 is surrounded by the bottom wall. 23 opposite to the opening, 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 parts that are connected after forming to form a shell with an opening. The end cover 25 and the housing can be independent parts, which are closed and connected after molding; the end cover 25 and the housing can also be integrated, specifically, the end cover 25 and the housing can be formed into one before other parts enter the shell. The common connection surface, when the inside of the housing needs to be sealed, the end cover 25 is then covered with the housing. The connection method of the housing and the end cover 25 may be welding, rolling pier sealing, etc. In this embodiment, the connection method of rolling pier sealing is selected. The bottom wall 23, the side wall 24 and the end cover 25 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in this embodiment of the present application. Exemplarily, in the embodiment of the present application, the bottom wall 23 , the side wall 24 and the end cover 25 are made of stainless steel.

The first electrode lead-out portion 21 and the second electrode lead-out portion 22 are disposed on the bottom wall 23 or the end cap 25 at the same time. Exemplarily, the first electrode lead-out part 21 and the second electrode lead-out part 22 are arranged on the end cover 25, and the edge of the end cover 25 is connected to the side wall 24 of the housing, so that the distance between the edge of the end cover 25 and the central part Part of it serves as the first electrode lead-out part 21 ; the second electrode lead-out part 22 is an electrode terminal insulated and installed in the center of the end cover 25 , and the liquid injection hole 221 penetrates through the electrode terminal along the thickness direction of the end cover 25 .

The manner in which the first electrode lead-out portion 21 is electrically connected to the first tab 11 may be direct connection or indirect connection to achieve electrical conduction. The direct connection between the lead-out part of the electrode and the first tab 11 includes: direct contact and conduction, bonding through conductive glue, or welding. The indirect connection between the first electrode lead-out portion 21 and the first tab 11 refers to the connection through other conductive components. Exemplarily, as shown in FIG. 5 and FIG. 6 , the battery cell 102 also includes another adapter 3 (for convenience The difference is hereinafter referred to as the first adapter piece 6), the first adapter piece 6 covers the first tab 11 of the electrode assembly 1, and the connection mode between the first tab 11 and the first adapter piece 6 can be contact conduction, through conduction Adhesive bonding or welding, the connection of the first adapter piece 6 and the first electrode lead-out portion 21 may be contact conduction, bonding or welding through conductive adhesive. In this embodiment, for example, the first adapter piece 6 is welded to the first tab 11 and welded to the first electrode lead-out portion 21 .

The adapter piece 3 is a component for conduction and overcurrent. As shown in FIG. 5 and FIG. 6 , the adapter 3 is a tubular structure made of 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 portion 22 . The connection mode between the adapter 3 and the second tab 12 can be contact conduction, bonding or welding through conductive glue, and the connection mode between the adapter 3 and the second electrode lead-out part 22 can be contact conduction, bonding through conductive glue Or welding, that is, the outer peripheral surface 31 of one end of the adapter 3 protruding into the liquid injection hole 221 is connected to the inner peripheral surface 2211 of the liquid injection hole 221 . The center of the tubular adapter 3 forms a channel for flowing the electrolyte. 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 to inject the electrolyte.

In the battery cell 102 provided in the embodiment of the present application, under the overall arrangement of the casing assembly 2, the electrode assembly 1, and the adapter 3, the distance between the first tab 11 and the second tab 12 is relatively far and it is not easy to overlap each other, resulting in Short circuit, high safety; the confluence part 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, so that the structure of the battery 100 is more compact; and through the second electrode lead-out part 22 and the switch The connector 3 realizes liquid injection and opening formation, and there is no need to set up another liquid injection hole 221 on the housing assembly 2, which further simplifies the structure of the battery cell 102; and, the end of the adapter 3 extends into the liquid injection hole 221, avoiding The limitation of the inner space of the shell assembly 2 on the adapter 3 does not cause the problem that the length of the adapter 3 is too small to connect the second electrode lead-out part 22, nor does the length of the adapter 3 cause a large The problem that it cannot be assembled in the shell 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 accuracy requirements of the adapter 3 are reduced, and it is easier to manufacture and assemble, Moreover, the connection between the adapter 3 and the second electrode lead-out portion 22 can be realized in an externally visible state, which improves the connection quality between the adapter 3 and the second electrode lead-out portion 22 , with high connection strength and good flow-through capacity.

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

As shown in FIG. 8 , 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 (for example, when the liquid injection hole 221 is a round hole, the laser L moves along the liquid injection hole 221 The inner peripheral surface 2211 of the hole is translated in a circular track), so that the outer peripheral surface 31 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, and the whole welding process is visible state.

Since the adapter 3 and the second electrode lead-out portion 22 can be connected in an externally visible state, the processing speed is fast, and the phenomenon of virtual welding can be reduced, so that the connection between the adapter 3 and the second electrode lead-out portion 22 is stable and prevents overcurrent Good ability to ensure welding quality and improve welding efficiency.

According to some embodiments of the present application, as shown in FIG. 7 , the outer peripheral surface 31 of one 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 the first conical surface. The second cone to which the conical face matches.

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

Through the cooperation of the first conical surface and the second conical surface, the effect of guiding the centering of 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 fit together to avoid voids. Welding problem.

According to some embodiments of the present application, as shown in FIG. 7 , the diameter of the first conical surface gradually decreases toward the direction away from the interior of the battery cell 102 .

Due to the cooperation of the second conical surface and the first conical surface, the diameter of the liquid injection hole 221 facing the inside of the battery cell 102 is relatively large, which is convenient for the adapter 3 to be connected to the electrode assembly 1 first, and then put into the shell together with the electrode assembly 1. Extend into the liquid injection hole 221 and complete the connection, that is, through the above-mentioned settings, first connect the hidden parts inside the battery cell 102, and then connect the external visible parts to ensure the stable connection between the adapter 3 and the second tab 12 , which also facilitates the assembly of the adapter 3 and the second electrode lead-out part 22 .

On the other hand, due to manufacturing errors, the outer peripheral surface 31 of the insertion end of the adapter 3 is not necessarily equal in height. 221 is flush with the edge of the end and there is a virtual weld. By setting the outer peripheral surface 31 of the adapter 3 as the first conical surface that gradually decreases toward the direction away from the inside of the battery cell 102, the adapter 3 and the battery cell 102 are assembled together. Pressing against the liquid injection hole 221 can make the higher position of the outer peripheral surface 31 exceed the liquid injection hole 221, and ensure that the lower position of the outer peripheral surface 31 is flush with the end edge of the liquid injection hole 221 to avoid false welding.

According to some embodiments of the present application, as shown in FIG. 7 and FIG. 9 , the battery cell 102 further includes a sealing member 26, which is used to close the liquid injection hole 221, and the sealing member 26 and the adapter 3 extend into the liquid injection hole 221. One end of the hole 221 is oppositely disposed.

The sealing member 26 is a plate structure, and the sealing member 26 covers the liquid injection hole 221 and the end of the adapter 3 to prevent leakage of the electrolyte.

According to some embodiments of the present application, as shown in FIG. 9 , the liquid injection hole 221 includes a first hole segment 221a and a second hole segment 221b, and the second hole segment 221b is closer to the inside of the battery cell 102 than the first hole segment 221a , the diameter 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 on the first hole section 221a.

The liquid injection hole 221 is a stepped hole, which includes a first hole section 221a and a second hole section 221b, the first hole section 221a has a relatively large aperture, and the second hole section 221b has a relatively small aperture, wherein the second hole section 221b is relatively close to the inside of the battery cell 102, the first hole section 221a is used to accommodate the seal 26, the second hole section 221b is used to accommodate one end of the adapter 3, and the liquid injection hole 221 is used to connect the adapter 3 The inner peripheral surface 2211 is the inner wall of the second hole segment 221b.

The connection interface between the adapter piece 3 and the second hole section 221b is located between the axis and the inner wall of the first hole section 221a, and the first hole section 221a provides a large space for welding operation, which is convenient for welding. At the same time, the connection interface between the adapter piece 3 and the second hole section 221b and the channel on the adapter piece 3 are covered by the sealing piece 26 to ensure a better sealing effect.

According to some embodiments of the present application, as shown in FIG. 10 , the battery cell 102 further includes a current collector 4 , the current collector 4 is attached to the second tab 12 and is used to connect the second tab 12 and the adapter 3, to realize the electrical connection between the second tab 12 and the adapter 3 .

The current collecting piece 4 is a plate structure, the current collecting piece 4 covers the second tab 12 of the electrode assembly 1 , and is connected to one end of the adapter piece 3 . The current collector 4 may be in any shape such as a disc shape, a rectangle shape, or the like.

By providing the current collector 4 , more areas of the second tab 12 are directly connected to the current collector 4 , which improves the connection strength and the flow area, making the battery cell 102 have a higher flow capacity.

According to some embodiments of the present application, as shown in FIGS. 10 and 11 , the current collector 4 covers one end of the electrode assembly 1 having the second tab 12 , and the end of the adapter 3 away from the liquid injection hole 221 is connected to the current collector. A first through hole 41 is formed on the collector 4 , and the first through hole 41 corresponds to the inner space of the adapter 3 .

The inner space of the adapter 3 refers to the passage of the adapter 3 for allowing the flow of electrolysis.

The current collector 4 is disc-shaped, and 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 relatively large, ensuring that the winding center hole 13 is double The second tab 12 on the side can flow through the current collector 4 to avoid polarization problems and further improve the current flow capacity; and by setting the first through hole 41 through the current collector 4 and connecting the tubular adapter 3 The internal space allows the electrolyte to flow to the other end of the battery cell 102, so that the inside of the casing assembly 2 can be quickly filled with electrolyte from bottom to top, and the wetting effect and speed of the electrolyte can be improved.

According to some embodiments of the present application, as shown in FIG. 11 , the current collector 4 is formed with a plurality of second through holes 42 , and the positions of the second through holes 42 and the inner space of the adapter 3 are staggered.

The second through hole 42 is located at the position of the current collector 4 corresponding to the second tab 12, which facilitates the electrolyte to flow from the second through hole 42 to the end of the electrode assembly 1. In this direction, the electrolyte is less hindered and can Quickly enter the gap between the pole pieces, and improve the infiltration rate and effect of the electrolyte on the inside of the electrode assembly 1 .

According to some embodiments of the present application, as shown in FIG. 11 , a first groove 43 is formed on the side of the current collector 4 facing the second tab 12 , and the two ends of the first groove 43 respectively extend to the ends of the current collector 4 . Edge, the first through hole 41 is disposed on the bottom wall 23 of the groove.

The side of the current collector 4 facing the second tab 12 is recessed along its own thickness direction, thereby forming a first groove 43, and the first groove 43 crosses the current collector 4 along the diameter direction of the current collector 4, so that the collector The central area of the flow member 4 communicates with the edge area, thereby forming a channel for flowing the electrolyte between the current collector 4 and the electrode assembly 1, and the first groove 43 passes through any two adjacent pole pieces of the electrode assembly 1 The gap ensures the infiltration effect and infiltration rate of the electrolyte.

The forming method of the first groove 43 may be to thin the current collector 4 , such as cutting or grinding the surface of the current collector 4 to form the first groove 43 . The first groove 43 may 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 collecting piece 4, so as to prevent the thickness of the current collecting piece 4 at the first groove 43 from being thinned, thereby ensuring the connection between the current collecting piece 4 and the adapter piece 3. connection strength.

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 that the electrolyte Infiltration effect.

The first groove 43 can also be a curved or spiral shape connecting the edge and the center of the current collector 4, so that the first groove 43 not only passes through the gap between any two adjacent pole pieces of the electrode assembly 1, but also extends the first The length of the groove 43 increases the overlapping area between the first groove 43 and each gap, further improving the wetting effect of the electrolyte.

According to some embodiments of the present application, as shown in FIG. 12 , a second groove 44 is formed on the side 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 .

Similar 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 .

By setting the second groove 44 on the side of the current collector 4 facing away from the second tab 12 , the second groove 44 marks the welding area, so as to facilitate welding.

Optionally, the shape of the second groove is V-shaped, the apex of the V-shape is close to the center of the current collecting piece 4 , and the opening of the V-shaped is facing the edge of the current collecting piece 4 . By setting the second groove 44 into a V shape, both the coil layer near the center and the coil layer near the edge of the second tab 12 have welding positions, so as to avoid polarization.

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

By forming a protrusion on the side of the current collector 4 facing the second pole ear 12, when the current collector 4 covers the second pole ear 12, the protrusion can be embedded in the second pole ear 12 to ensure that the protrusion and the second pole The ears 12 are in full contact without gaps. At the same time, the second groove 44 corresponds to the position of the protrusion, so that the second groove 44 has no gap with the second tab 12, when the welding head of the welding equipment acts on the second groove 44 to weld the second tab 12 , can avoid the problem of false welding.

The protrusion may be a conductive member bonded or welded on 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, in the form of bending the current collector 4, and the second groove 44 on the side of the current collector 4 away from the second tab 12, so that the current collector 4 faces the second tab. One side of the tab 12 forms a protrusion.

In a second aspect, the embodiment of the present application provides a battery 100 , as shown in FIG. 2 , the battery 100 includes the aforementioned battery cells 102 . By arranging the aforementioned battery cells 102, the confluence component in the battery 100 of the present application only needs to occupy one side in the height direction of the battery cells 102, the overall structure of the battery 100 is compact, and the battery 100 is safe and easy to assemble.

In a third aspect, the embodiment of the present application provides an electric device. As shown in FIG. 1 , the electric device may be a vehicle 1000 , and the vehicle 1000 includes the aforementioned battery 100 . The battery 100 occupies a small space, has good safety, is convenient to assemble, and is conducive to the miniaturization of electric equipment.

In a fourth aspect, the embodiment of the present application provides a method for manufacturing a battery cell 102, as shown in FIG. 13 , the method includes:

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. The electrode assembly 1 Has a winding center hole 13;

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

S3, provide an adapter 3, the adapter 3 is tubular;

S4. Put the adapter 3 through the winding center hole 13, and connect one end of the adapter 3 to the second tab 12; put the adapter 3 and the electrode assembly 1 into the shell assembly 2, so that the first An electrode lead-out part 21 and a second electrode lead-out part 22 are both arranged on the side of the housing assembly 2 close to the first tab 11, electrically connecting the first tab 11 and the first electrode lead-out part 21, and connecting the adapter 3 The other end extends into the liquid injection hole 221 and the outer peripheral surface 31 is connected 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 .

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

When assembling the battery cell 102 based on the above-mentioned manufacturing method of the battery cell 102, it is not necessary to follow the above steps in order, that is to say, the steps may be performed in the order mentioned in the embodiment, or may be different from the order mentioned in the embodiment. The steps are executed in sequence, or several steps are executed simultaneously. For example, steps S1 , S2 , and S3 are executed in no particular order, and may also be executed simultaneously.

In the fifth aspect, the embodiment of the present application provides a manufacturing equipment 7 for a battery cell 102, as shown in FIG. 74 and the second assembly device 75.

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 on two sides of the electrode assembly 1 At the end, the electrode assembly 1 has a winding center hole 13 .

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

The third providing device 73 is used for providing the adapter piece 3, and the adapter piece 3 is in the shape of a tube.

The first assembly device 74 is used for passing the adapter 3 through the winding center hole 13 and connecting one end of the adapter 3 to the second tab 12 .

The second assembly device 75 is used to put the adapter 3 and the electrode assembly 1 into the housing assembly 2, so that the first electrode lead-out portion 21 and the second electrode lead-out portion 22 are both located at one side of the shell assembly 2 close to the first tab 11 On the side, the first tab 11 is electrically connected to the first electrode lead-out part 21, and the other end of the adapter 3 is inserted into the liquid injection hole 221, and the outer peripheral surface 31 is connected to the inner peripheral surface 2211 of the liquid injection hole 221, so as to The electrical connection between the second tab 12 and the second electrode lead-out portion 22 is realized.

For the relevant structure of the battery cell 102 manufactured by the above-mentioned manufacturing equipment 7 , reference may be made to the battery cell 102 provided in the above-mentioned embodiments.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

According to some embodiments of the present application, please refer to Fig. 3-Fig. The second insulating part 52 , the first transition part 6 and the sealing part 26 .

The casing assembly 2 includes a bottom wall 23, a side wall 24, an end cover 25, and a first electrode lead-out portion 21 and a second electrode lead-out portion 22 for inputting or outputting electric energy, the bottom wall 23, the side wall 24, and the end cover 25 constitute In the inner space of the housing assembly 2 , the second electrode lead-out part 22 is an electrode terminal mounted on the end cover 25 for insulation, and the first electrode lead-out part 21 is a part of the end cover 25 between the electrode terminal and the side wall 24 . The electrode assembly 1 has a winding center hole 13, and the two ends of the electrode assembly 1 along the extension direction of the winding center hole 13 are respectively provided with a first tab 11 and a second tab 12, and the first tab 11 and the second tab The polarity of 12 is reversed. The electrode assembly 1 is disposed in the inner space of the shell 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 cover 25 are electrically connected through the first adapter 6 . The first insulator 51 is disposed between the electrode assembly 1 and the end cap 25 to insulate and isolate the second electrode lead-out portion 22 from the first tab 11 and the second adapter 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 adapter 3 is passed through the winding center hole 13 of the electrode assembly 1 , and the second insulating member 52 is sheathed on the adapter 3 to insulate and isolate the inner wall of the adapter 3 and 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. The liquid injection hole 221 includes a first hole section 221a and a second hole section 221b. The section 221 a has a relatively large diameter and is relatively far away from the interior of the battery cell 102 , and the second hole section 221 b has a relatively small diameter and is relatively close to the interior of the battery cell 102 . One end of the adapter 3 is connected to the current collector 4, and the other end extends into the second hole segment 221b and is butt-welded with the inner wall of the second hole segment 221b, so as to realize the electrical connection between the second tab 12 and the second electrode lead-out part 22. connect. The adapter 3 has a tubular structure, and a first through hole 41 is provided on the collector 4. The first through hole 41 corresponds to the inner space of the adapter 3, so as to realize the passage from the liquid injection hole 221 through the inner space of the adapter 3. , The first through hole 41 injects the electrolyte solution into the battery cell 102 . The sealing member 26 is configured to inject the electrolyte solution into the battery cell 102 and fit into the first hole segment 221 a after forming to seal the liquid injection hole 221 .

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A battery cell, 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 both ends of the electrode assembly, and the electrode assembly has a winding central hole ;

The shell assembly includes a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electric energy, the inside of the shell assembly is provided with the electrode assembly, the first electrode lead-out portion and the second electrode lead-out portion The parts are all arranged on the side of the shell assembly close to the first tab, the first electrode lead-out part is electrically connected to the first tab, and the second electrode lead-out part is provided for connecting to the battery. The liquid injection hole for injecting electrolyte into the inside of the monomer;

An adapter, the adapter is tubular and pierced 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 injector The outer peripheral surface of the liquid hole is connected to the inner peripheral surface of the liquid injection hole, so as to realize the electrical connection between the second tab and the second electrode lead-out part.
The battery cell according to claim 1, wherein an outer peripheral surface of one end of the adapter extending into the liquid injection hole is welded to an inner peripheral surface of the liquid injection hole.
The battery cell according to claim 1 or 2, wherein the outer peripheral surface of one 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 The first conical surface matches the second conical surface.
The battery cell according to claim 3, wherein the diameter of the first conical surface gradually decreases toward a direction away from the interior of the battery cell.
The battery cell according to any one of claims 1-4, wherein the battery cell further comprises a sealing member, the sealing member is used to close the liquid injection hole, and the sealing member is connected to the adapter One end of the piece protruding into the liquid injection hole is oppositely arranged.
The battery cell according to claim 5, wherein the liquid injection hole comprises a first hole section and a second hole section, and the second hole section is closer to the battery cell than the first hole section. Inside, the aperture diameter of the second hole section is smaller than the aperture diameter of the first hole section, the outer peripheral surface of the adapter is connected with the inner peripheral surface of the second hole section, and the sealing element is arranged on the first hole section. A hole segment.
The battery cell according to any one of claims 1-6, wherein the battery cell further comprises a current collector, the current collector is attached to the second tab and used for connecting the first tab the second pole ear and the transition piece, so as to realize the electrical connection between the second pole lug and the transition piece.
The battery cell according to claim 7, wherein the current collector covers one end of the electrode assembly having the second tab, and the end of the adapter member away from the liquid injection hole is connected to the The current collecting piece is formed with a first through hole, and the first through hole corresponds to the internal space position of the adapter piece.
The battery cell according to claim 8, wherein the current collector is formed with a plurality of second through holes, and the positions of the second through holes and the inner space of the adapter are staggered.
The battery cell according to claim 8 or 9, wherein a first groove is formed on the surface of the current collector facing the second tab, and the two ends of the first groove respectively extend to the The edge of the current collector, the first through hole is disposed on the bottom wall of the groove.
The battery cell according to claim 7-10, wherein a second groove is formed on a side of the current collector facing away from the second tab, and a bottom wall of the second groove is in contact with the second tab. Tab welding.
The battery cell according to claim 11, wherein a protrusion is formed on a side of the current collector facing the second tab, and the protrusion is opposite to the second groove.
A battery, comprising the battery cell according to any one of claims 1-12.
An electric device, comprising the battery according to claim 13.
A method for manufacturing a battery cell, comprising:

An electrode assembly is provided, 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 two ends of the electrode assembly, the electrode assembly Has a winding center hole;

Provide a shell assembly, the shell assembly includes 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 are both arranged on the shell assembly On the same side of the battery cell, the second electrode lead-out part is provided with a liquid injection hole for injecting electrolyte solution into the battery cell;

providing an adapter, said adapter being tubular;

Put the adapter piece through the winding center hole, and connect one end of the adapter piece to the second tab; put the adapter piece and the electrode assembly into the casing component, so that the first electrode lead-out part and the second electrode lead-out part are both arranged on the side of the shell component close to the first tab, and the first tab and the first electrode The lead-out part is electrically connected, and the other end of the adapter is inserted into the liquid injection hole and the outer peripheral surface is connected to the inner peripheral surface of the liquid injection hole, so as to realize the connection between the second tab and the second tab. The electrical connection of the electrode lead-out part.
A battery cell manufacturing equipment, including:

The first providing device is used to provide an electrode assembly, the electrode assembly includes a first tab and a second tab with opposite polarities, and the first tab and the second tab are respectively located on the electrode assembly At both ends, the electrode assembly has a wound central hole;

The second providing device is used to provide a casing assembly, the casing 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 They are all arranged on the same side of the shell assembly, and the second electrode lead-out part is provided with a liquid injection hole for injecting electrolyte into the battery cell;

The third providing device is used for providing an adapter, and the adapter is tubular;

a first assembly device, configured to pass the adapter piece through the winding center hole, and connect one end of the adapter piece to the second tab;

The second assembly device is used to put the adapter and the electrode assembly into the shell assembly, so that the first electrode lead-out part and the second electrode lead-out part are both located in the shell assembly close to the One side of the first tab, electrically connect the first tab to the first electrode lead-out part, and extend the other end of the adapter into the liquid injection hole and the outer peripheral surface is connected to the The inner peripheral surface of the liquid injection hole is connected to realize the electrical connection between the second tab and the second electrode lead-out part.