WO2023133850A1

WO2023133850A1 - Battery cell, battery, electric device, and method and device for manufacturing battery cell

Info

Publication number: WO2023133850A1
Application number: PCT/CN2022/072158
Authority: WO
Inventors: 谷慧; 刘超; 余文杰; 迟庆魁; 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: CN117256076A

Abstract

A battery cell, a battery, an electric device, and a method and device for manufacturing a battery cell. The battery cell (102) comprises: an electrode assembly (1), comprising a first tab (11) and a second tab (12), which are located at two axial ends of the electrode assembly (1) and have opposite polarities, wherein the electrode assembly (1) has a winding center hole (13); a casing assembly (2), wherein the electrode assembly (1) is arranged inside the casing assembly (2), a first electrode lead-out portion (21) and a second electrode lead-out portion (22) of the casing assembly (2) are both arranged on the side of the casing assembly (2) that is close to the first tab (11) in an axial direction, and the first electrode lead-out portion (21) is electrically connected to the first tab (11); an adapter (3), which passes through the winding center hole (13) and is configured to electrically connect the second tab (12) to the second electrode lead-out portion (22); a first insulating member (4), which is arranged at the end of the electrode assembly (1) that is provided with the first tab (11), and which is provided with a through hole (41) through which the adapter (3) passes, and is configured to insulate and isolate the first tab (11) from the second electrode lead-out portion (22); and a second insulating member (5), which is sleeved on the adapter (3) and located between an outer peripheral face (311) of the adapter (3) and an inner wall of the winding center hole (13), wherein one end of the second insulating member (5) abuts against the first insulating member (4) so as to prevent a short circuit.

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 mobile phones, computers, electric vehicles and other electrical equipment to provide electrical energy for electrical equipment. With the continuous development of technology, the structure of the battery is required to be more compact, and the safety of the battery is higher. However, when the structure of the battery is more compact, the problem of lap short circuit of components with opposite polarities is prone to occur, so it is difficult to balance between a more compact structure and the safety of the battery.

Contents of the invention

The purpose of the present application is to provide a battery cell, a battery, an electrical device, and a manufacturing method and device for the battery cell, so that the battery has a more compact structure and the safety of the battery is higher.

The embodiment of the application is realized like this:

In the first aspect, the 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, and the first tab and the second tab are respectively located along the electrode assembly. At both ends of its own axial direction, the electrode assembly has a winding center hole; the shell assembly includes a first electrode lead-out part and a second electrode lead-out part for inputting or outputting electric energy, and the inside of the shell assembly is provided with an electrode assembly, the first electrode Both the lead-out part and the second electrode lead-out part are arranged on the side of the shell assembly axially close to the first tab, and the first electrode lead-out part is electrically connected to the first tab; the adapter is passed through the winding center hole, The adapter is used to connect the second tab and the second electrode lead-out part, so as to realize the electrical connection between the second tab and the second electrode lead-out part; the first insulator is arranged at one end of the electrode assembly where the first tab is provided And there is a through hole through which the adapter piece passes, which is used to insulate and isolate the first tab and the second electrode lead-out part; the second insulating piece is sleeved on the adapter piece and is located on the outer peripheral surface of the adapter piece and wound Between the inner walls of the central hole; wherein, one end of the second insulator abuts against the first insulator.

In the technical solution of the present application, by arranging the first electrode lead-out part and the second electrode lead-out part at the same end of the battery cell, the confluence component can be connected at the same end of the battery cell, thereby simplifying the structure of the battery; The end of the insulator facing the second electrode lead-out part is configured to extend to abut against the first insulator, so as to completely isolate the second electrode lead-out part and the adapter part from the part with the opposite polarity in the battery cell, effectively preventing transfer. When the connector passes through the second tab, it is overlapped and short-circuited, so as to simplify the structure of the battery and take into account the safety of the battery cell.

In one embodiment of the present application, a protrusion is provided on the side of the first insulator away from the lead-out portion of the second electrode, and the protrusion is arranged along the circumference of the through hole, and the second insulator has a first insulator facing the lead-out portion of the second electrode. On one end face, the protrusion abuts against the first end face along the axial direction.

In the above technical solution, the thickness of the first insulator at the protrusion is greater than the thickness of the remaining part, and by making the protrusion correspond to the first end face, it is ensured that the first insulator and the second insulator are in close contact, and the protrusion and the second insulator are pressed against each other. A gap is not likely to appear between the first end faces, which effectively prevents a short circuit.

In one embodiment of the present application, along the axial direction toward the second insulating member, the inner peripheral surface of the protrusion is inclined to the outer peripheral surface away from the adapter to form a slope or an arc surface.

In the above technical solution, by configuring the raised inner peripheral surface as a slope or an arc surface, the raised inner peripheral surface acts as a guide for the adapter so that the adapter can pass through the first insulating member and connect to the second insulating member. Electrode lead-out part.

In one embodiment of the present application, the section of the protrusion in the axial direction is triangular or semicircular.

In the above technical solution, by configuring the section of the protrusion in the axial direction as a triangle or a semicircle, so that the inner peripheral surface of the protrusion is a slope or an arc surface, so that the inner peripheral surface of the protrusion can guide the adapter, Easy to assemble. On the other hand, the size of the end of the triangular or semicircular protrusion is small, and the protrusion is easy to be compressed and deformed when it abuts against the first end surface, which further ensures that the protrusion and the first end face are in close contact, so that the protrusion and the first end surface There is no gap between the end faces, which effectively prevents short circuits.

In one embodiment of the present application, a groove is formed on the first end surface, and the protrusion is configured to be inserted into the groove and interfere with the groove.

In the above technical solution, by interfering the protrusion with the groove on the first end surface, the protrusion overlaps with the second insulating part and is not easy to separate, ensuring that there is no gap between the first insulating part and the second insulating part. A gap will appear, effectively preventing short circuits.

In an embodiment of the present application, one end of the second insulating member facing the second electrode lead-out portion is located inside the winding center hole.

In the above technical solution, by arranging the second insulator inside the winding center hole, the second insulator is prevented from protruding from the electrode assembly in the axial direction and exceeding the first tab, preventing the second insulator from interfering with the lug flattening device , to avoid affecting the first ear rubbing flat.

In an embodiment of the present application, the second electrode lead-out portion has a second end surface facing the inside of the battery cell, and the projection of the protrusion on the second electrode lead-out portion along the axial direction is located within the range of the second end surface.

In the above technical solution, the second end surface of the second electrode lead-out part is against the back of the protrusion, providing a reaction force to the protrusion, so as to ensure that the protrusion and the second insulator are tightly pressed, so that the gap between the protrusion and the first end surface Gaps are not easy to appear, and the overall bending deformation of the first insulating member is avoided, effectively preventing short circuit.

In one embodiment of the present application, there is a gap between the inner wall of the through hole and the outer peripheral surface of the adapter.

In the above technical solution, the adapter part and the first insulating part are in clearance fit, and the adapter part is not easy to interfere when passing through, which is convenient for assembly.

In an embodiment of the present application, one end of the second insulating member facing the second electrode lead-out portion protrudes into the through hole and is interference-fitted with the through hole.

In the above technical solution, by extending the end of the second insulator facing the second electrode lead-out part into the through hole and interfering with the through hole, the first insulator and the second insulator are partially overlapped and are not easily separated, It is ensured that there will be no gap between the first insulating part and the second insulating part, effectively preventing short circuit.

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

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

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 both ends of the electrode assembly along its own axial direction, and the electrode assembly has a winding central 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 same side of the shell assembly; providing an adapter ; Provide the first insulating part; provide the second insulating part; pass the second insulating part and the adapter part through the winding center hole, and make the second insulating part be located on the outer peripheral surface of the adapter part and the inner wall of the winding center hole Between; put the adapter, the electrode assembly, the first insulator and the second insulator into the shell assembly, so that the side of the shell assembly with the first electrode lead-out part and the second electrode lead-out part is close to the first tab , the first electrode lead-out portion is electrically connected to the first tab, the second pole tab is electrically connected to the second electrode lead-out portion through an adapter, and the first insulator is located at the end of the electrode assembly where the first tab is provided and sleeved It is provided on the adapter to insulate and isolate the first tab and the second electrode lead-out part, and make one end of the second insulator abut against the first insulator.

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. The first tab and the second tab are respectively located at both ends of the electrode assembly along its own axis. The assembly has a winding central hole; the second providing device is used to provide the 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 The parts are all arranged on the same side of the shell assembly; the third providing device is used to provide the adapter; the fourth providing device is used to provide the first insulating part; the fifth providing device is used to provide the second insulating part; The assembly device is used to pass the second insulating part and the adapter part through the winding center hole, and make the second insulating part be located between the outer peripheral surface of the adapter part and the inner wall of the winding center hole; the second assembly device, It is used to put the adapter, the electrode assembly, the first insulator and the second insulator into the shell assembly, so that the side of the shell assembly provided with the first electrode lead-out part and the second electrode lead-out part is close to the first tab, The first electrode lead-out part is electrically connected to the first pole lug, the second pole lug is electrically connected to the second electrode lead-out part through an adapter, and the first insulating part is located at the end of the electrode assembly where the first pole lug is provided and sleeved In the adapter part, the first tab and the second electrode lead-out part are isolated by insulation, and one end of the second insulating part is abutted against the first insulating 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 the sectional view of Fig. 4;

Figure 6 is a partially enlarged view of Figure 5;

Fig. 7 is a schematic diagram of a first insulating member and a second insulating member provided by an embodiment of the present application;

Fig. 8 is a schematic diagram of a first insulating member and a second insulating member provided by an embodiment of the present application;

Fig. 9 is a schematic diagram of a first insulating member and a second insulating member provided by an embodiment of the present application;

Fig. 10 is a schematic diagram of a first insulating member and a second insulating member provided by an embodiment of the present application;

Fig. 11 is a schematic diagram of a first insulating member and a second insulating member provided by an embodiment of the present application;

FIG. 12 is a schematic flowchart of a method for manufacturing a battery cell provided by an embodiment of the present application;

Fig. 13 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; -bottom wall; 24-side wall; 25-end cover; 3-transition piece; 31-transition part; 311-outer peripheral surface; 32-collection part; 4-first insulating part; -protrusion; 421-inner peripheral surface; 43-surrounding wall; 5-second insulator; 51-first end surface; 52-groove; -the first providing device; 72-the second providing device; 73-the third providing device; 74-the fourth providing device; 75-the fifth providing device; 76-the first assembly device; 77-the second assembly device; P- Axial; R-radial.

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 appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are independent 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, 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 case assembly for accommodating the electrode assembly. The casing assembly includes an electrode lead-out part, which is used to electrically connect to the electrode assembly, so as to realize charging and discharging of the electrode assembly.

In a battery, a plurality of battery cells are electrically connected through a bus member. In order to simplify the structure of the battery, the inventors provided the positive electrode lead-out portion and the negative electrode lead-out portion of the battery cell at the same end of the battery cell, so as to facilitate the connection of the bus member to the positive electrode lead-out portion and the negative electrode lead-out portion. However, the inventors found that if two electrode lead-out parts are arranged at the same end of the battery cell, the overcurrent path inside the battery cell is complicated, and parts with opposite polarities are likely to be overlapped and short-circuited, and the safety is low.

In view of this, in order to simplify the structure of the battery and improve safety, the embodiment of the present application provides a solution, the electrode assembly has a winding center hole, and the electrode assembly is configured such that the two ends of the electrode assembly along its own axis P are respectively provided with opposite polarities. The first pole lug and the second pole lug, the housing assembly includes a first electrode lead-out portion and a second electrode lead-out portion both arranged on a side close to the first pole lug, wherein the first pole lug is electrically connected to the first electrode lead-out portion , the second tab is electrically connected to the lead-out part of the second motor through the adapter piece pierced in the center hole of the winding, so that the confluence component can be connected at the same end of the battery cell, and the structure of the battery can be simplified. At the same time, the electrode One end of the component with the first tab is provided with a first insulator, the first insulator isolates the first tab and the second electrode lead-out part, and the first insulator is provided with a through hole for the adapter to pass through, and the A second insulator is provided between the outer peripheral surface of the adapter and the inner wall of the winding center hole, that is, the second insulator is sleeved on the adapter, and one end of the second insulator abuts against the first insulator, In order to completely isolate the second electrode lead-out part and the adapter part from the opposite polarity part of the battery cell, effectively prevent overlapping short circuit, realize the simplified structure of the battery cell and take into account the safety of the battery cell.

The technical solutions described in the embodiments of the present application are applicable to batteries and electric devices using batteries.

Electrical consumers can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, and more. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more. The embodiment of the present application does not impose special limitations on the above electric equipment.

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 100 module, and then multiple battery modules 100 may be connected in series, parallel or mixed to form a 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 is a detailed description of any battery cell 102. As shown in FIG. 3, FIG. 4 and FIG. Insulation 5. 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 along its own axial direction P. The electrode assembly 1 has a roll 13 around the center hole. 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 The first electrode lead-out portion 21 is electrically connected to the first pole ear 11 . The adapter piece 3 is passed through the winding center hole 13, and the adapter piece 3 is used to connect the second tab 12 and the second electrode lead-out portion 22, so as to realize the electrical connection between the second tab 12 and the second electrode lead-out portion 22 . The first insulator 4 is arranged at one end of the electrode assembly 1 provided with the first tab 11 and is provided with a through hole 41 for the adapter 3 to pass through. The first insulator 4 is used to insulate and isolate the first tab 11 from the first tab 11 Two electrode lead-out parts 22 . The second insulator 5 is sleeved on the adapter 3 and located between the outer peripheral surface 311 of the adapter 3 and the inner wall of the winding center hole 13 . Wherein, one end of the second insulating member 5 abuts against the first insulating member 4 .

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. 5 , the first tab 11 and the second tab 12 are located at both ends of the axial direction P of the electrode assembly 1 . In the present application, the electrode assembly 1 is a winding structure with a winding center hole 13 , the extension direction of the winding center hole 13 is the axial direction P, and the direction perpendicular to the axial direction P is the radial direction R.

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 simultaneously disposed on the bottom wall 23 or the end cap 25 so as to be located on one side of the axial direction P of the battery cell 102 . Exemplarily, the first electrode lead-out part 21 and the second electrode lead-out part 22 are arranged on the end cover 25, the edge of the end cover 25 is connected to the side wall 24 of the housing, and the electrode terminal is insulated and installed at the center of the end cover 25, The portion between the edge and the center of the end cap 25 is used as the first electrode lead-out portion 21 , and the electrode terminal is used as the second electrode lead-out portion 22 .

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 part 21 and the first tab 11 refers to the connection through other conductive components. For example, as shown in FIG. structure, the current collector 6 covers the first tab 11 of the electrode assembly 1, the connection between the first tab 11 and the current collector 6 can be contact conduction, bonding or welding by conductive adhesive, the current collector 6 and the first The connection method of the electrode lead-out part 21 may be contact conduction, bonding or welding through conductive glue. In this embodiment, for example, the current collector 6 is welded to the first tab 11 and welded to the first electrode lead-out portion 21 . An avoidance hole penetrating in the axial direction P is provided on the disk-shaped current collector 6 , and the escape hole is opposite to the winding center hole 13 of the electrode assembly 1 to allow the adapter 3 to pass through.

The adapter piece 3 is a component for conduction and overcurrent. As shown in FIG. 3 , the adapter 3 includes an adapter portion 31 and a collector portion 32 , the adapter portion 31 passes through the winding center hole 13 along the axial direction P, and the collector portion 32 connects the second tab 12 and the adapter One end of part 31. Optionally, the transfer part 31 is a metal cylinder, the current collecting part 32 is a metal disc, the current collecting part 32 covers the second tab 12 of the electrode assembly 1, and one end of the transfer part 31 is connected to the current collecting part 32 and the other end The second electrode lead-out part 22 is connected. 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.

The first insulating member 4 is an insulating part with a disc-shaped structure. The first insulating member 4 is located at one end of the electrode assembly 1 provided with the first tab 11 to isolate the first tab 11 from the second electrode lead-out portion 22 . The first insulator 4 is provided with a through hole 41 penetrating in the axial direction P, so that the adapter 3 can pass through the through hole 41 to connect to the second electrode lead-out portion 22 . When the battery cell 102 includes a current collector 6 for connecting the first tab 11 and the first electrode lead-out portion 21, the first tab 11 is located between the current collector 6 and the second electrode lead-out portion 22, and the transfer The component 3 passes through the escape hole of the current collecting component 6 and the through hole 41 of the first insulating component 4 in sequence, and then connects to the second electrode lead-out portion 22 .

The second insulating member 5 is an insulating part with a cylindrical structure. The second insulator 5 sleeved on the adapter 3 means that the second insulator 5 is sleeved on the adapter portion 31 of the adapter 3 . The outer peripheral surface 311 of the adapter 3 mentioned in this application refers to the outer peripheral surface 311 of the adapter portion 31 of the adapter 3 .

The side of the second electrode lead-out portion 22 facing the inside of the battery cell 102 is covered by the first insulator 4, but the second electrode lead-out portion 22 is partially exposed at the through hole 41 of the first insulator 4; the outer peripheral surface of the adapter 3 The part 311 located in the winding center hole 13 is covered by the second insulating member 5 , and the part of the outer peripheral surface 311 of the adapter 3 outside the winding center hole 13 is exposed. The exposed area is easy to overlap with the deformed first tab 11 to cause a short circuit, and if there is a current collector 6 , it is easy to overlap with the current collector 6 to cause a short circuit, resulting in a decrease in the safety of the battery cell 102 .

By disposing one end of the second insulator facing the second electrode lead-out part 22 to extend to abut against the first insulator 4, both the second electrode lead-out part 22 and the adapter part 3 are connected to the polarity of the battery cell 102. The opposite parts are all isolated to effectively prevent overlapping short circuit, realize the simplification of the structure of the battery cell 102 and take into account the safety of the battery cell 102 .

The "contact" mentioned in the embodiment of the present application refers to contact and contact, that is, the two are interference contacts. By making one end of the second insulator 5 abut against the first insulator 4, even if there is a certain manufacturing tolerance or assembly tolerance, it can be ensured that one end of the second insulator 5 is in contact with the first insulator 4, so as to avoid the second There is a gap between one end of the insulating member 5 and the first insulating member 4 .

The material of the first insulator 4 and the second insulator 5 can be selected as plastic with toughness, so that one end of the first insulator 4 is elastically pressed against the abutting part of the second insulator 5 to further ensure that the first insulator There will be no gap between one end of 4 and the second insulating member 5 due to manufacturing tolerance, assembly tolerance, fatigue and other reasons.

According to some embodiments of the present application, as shown in FIG. 6 , the side of the first insulating member 4 facing away from the second electrode lead-out portion 22 is provided with a protrusion 42 , and the protrusion 42 is arranged along the circumference of the through hole 41 , and the second insulating member 4 5 has a first end surface 51 facing the second electrode lead-out portion 22, and the protrusion 42 abuts against the first end surface 51 along the axial direction P.

Since the adapter piece 3 passes through the through hole 41 , the protrusion 42 is arranged along the circumference of the through hole 41 , that is, the protrusion 42 surrounds the adapter piece 3 .

The first insulating member 4 is a cylindrical structure, and the first end surface 51 is an annular end surface.

The thickness of the first insulator 4 at the protrusion 42 is greater than the thickness of the remaining part, by corresponding the protrusion 42 to the first end surface 51, it is ensured that the first insulator 4 and the second insulator 5 are pressed against each other, and the protrusion 42 and the first insulator 5 are pressed against each other. There is no gap between the one end faces 51, which effectively prevents short circuit.

According to some embodiments of the present application, as shown in FIG. 6 and FIG. 7 , along the axial direction P toward the direction of the second insulator 5 , the inner peripheral surface 421 of the protrusion 42 is inclined away from the outer peripheral surface 311 of the adapter 3 so as to Form a bevel or arc.

The protrusion 42 surrounds the adapter 3 to form a channel, and the inner peripheral surface 421 of the protrusion 42 is the side of the protrusion 42 close to the adapter 3, and the inner peripheral surface 421 of the protrusion 42 is a slope or an arc surface, so that the protrusion 42 The diameter of the channel surrounded by 42 becomes larger as it gets closer to the second insulating member 5 .

By disposing the inner peripheral surface 421 of the protrusion 42 as an inclined plane or an arc surface, the inner peripheral surface 421 of the protrusion 42 plays a role of guiding the adapter 3, so that the adapter 3 can pass through the first insulating member 4 and connect to the second insulating member. Two electrode lead-out parts 22 .

According to some embodiments of the present application, as shown in FIG. 7 and FIG. 8 , the section of the protrusion 42 in the axial direction P is triangular or semicircular.

7 and 8 show the cross-sectional views of the first insulator 4 along the axial direction P and through the axis of the through hole 41. It can be seen that the cross-sectional shapes of the protrusions 42 on both sides of the through hole 41 are triangular or circular. .

By disposing the cross-section of the protrusion 42 in the axial direction as a triangle or a semicircle, the inner peripheral surface 421 of the protrusion 42 is a slope or an arc surface, so that the inner peripheral surface 421 of the protrusion 42 can guide the adapter 3, Easy to assemble.

On the other hand, by configuring the section of the protrusion 42 in the axial direction P as a triangle or a semicircle, the cross-sectional width of the end surface of the protrusion 42 is small, and the protrusion 42 is easily compressed and deformed when it abuts against the first end surface 51 , to further ensure that the protrusion 42 is in close contact with the first end surface 51, so that a gap is unlikely to appear between the protrusion 42 and the first end surface 51, effectively preventing short circuit.

In some other embodiments, as shown in FIG. 9 , the section of the protrusion 42 in the axial direction P is rectangular, so that the end surface of the protrusion 42 is parallel to the first end surface 51 to have a larger contact area, so that the protrusion 42 It is not easy to misalign with the second insulating member 5 when it is vibrated, so that the protrusion 42 and the first end surface 51 are not easy to stagger to form a gap, effectively preventing short circuit.

According to some embodiments of the present application, as shown in FIG. 10 , a groove 52 is formed on the first end surface 51 , and the protrusion 42 is configured to be inserted into the groove 52 and has an interference fit with the groove 52 .

By interfering with the protrusion 42 and the groove 52 of the first end surface 51, the protrusion 42 partially overlaps with the second insulator 5 and is not easy to separate, so that the gap between the first insulator 4 and the second insulator 5 is ensured. There will be no gaps, effectively preventing short circuits.

According to some embodiments of the present application, as shown in FIG. 6 , one end of the second insulating member 5 facing the second electrode lead-out portion 22 is located inside the winding center hole 13 .

The tabs of the electrode assembly 1 are multi-layered or separated, and the tabs are usually kneaded tightly by kneading equipment to reduce the gap between the tabs, so that the tabs have a dense end surface, so that other components can be electrically charged. Make sure the connection is stable.

By arranging the second insulating member 5 inside the winding center hole 13, the second insulating member 5 is prevented from protruding from the electrode assembly 1 in the axial direction P and exceeding the first tab 11, preventing the second insulating member 5 from interfering with the flattening equipment, Avoid affecting the first ear 11 and knead flat.

Similarly, the end of the second insulator 5 facing away from the second electrode lead-out portion 22 may also be configured to be located inside the winding center hole 13, so as to prevent the second insulator 5 from protruding from the electrode assembly 1 along the axial direction P and exceeding The second tab 12 prevents the second insulating member 5 from interfering with the kneading equipment and avoids affecting the kneading of the second tab 12 .

Optionally, the second insulator 5 can be used as an auxiliary tool for the winding and forming of the electrode assembly 1, and the second insulator 5 is sleeved on the winding needle of the winding equipment, so that the pole piece and the separator are wound around the second insulator 5 The electrode assembly 1 is formed by winding. After the electrode assembly 1 is formed, the electrode assembly 1 is connected to the second insulating member 5 and removed from the rolling needle, and the operation of kneading and equalizing the tabs is performed.

According to some embodiments of the present application, as shown in FIG. 6 , the second electrode lead-out portion 22 has a second end surface 221 facing the inside of the battery cell 102 , and the projection of the projection 42 on the second electrode lead-out portion 22 along the axial direction P Located within the range of the second end surface 221 .

The second end surface 221 is a surface of the second electrode lead-out portion 22 facing the first insulating member 4 .

In the above solution, the second end surface 221 of the second electrode lead-out part 22 is against the back of the protrusion 42, providing a reaction force to the protrusion 42, so as to ensure that the protrusion 42 and the second insulator 5 are in close contact, so that the protrusion 42 A gap is not likely to appear between the first end surface 51 and the overall bending deformation of the first insulating member 4 is avoided, effectively preventing short circuit.

According to some embodiments of the present application, as shown in FIG. 6 , there is a gap between the inner wall of the through hole 41 and the outer peripheral surface 311 of the adapter 3 .

The adapter part and the first insulating part 4 are in clearance fit, and the adapter part 3 is not easy to interfere when passing through, which is convenient for assembly.

According to some embodiments of the present application, one end of the second insulating member 5 facing the second electrode lead-out portion 22 protrudes into the through hole 41 and is interference-fitted with the through hole 41 .

One end of the second insulator 5 facing the second electrode lead-out portion 22 extends into the through hole 41, which means that the end of the second insulator 5 facing the second electrode lead-out portion 22 all extends into the through hole 41, so that the first end surface 51 is located at In the through hole 41, the outer peripheral surface of the second insulating member 5 abuts against the inner wall of the through hole 41; or, as shown in FIG. On the end face 51 , the protrusion 53 is inserted into the through hole 41 , and the outer peripheral surface of the protrusion 53 abuts against the inner wall of the through hole 41 .

By extending the end of the second insulator 5 facing the second electrode lead-out part 22 into the through hole 41 and interfering with the through hole 41, the first insulator 4 and the second insulator 5 partially overlap and are not easily separated. It is ensured that there will be no gap between the first insulator 4 and the second insulator 5, effectively preventing short circuit.

In some embodiments, in order to ensure that the first electrode lead-out part 21 is installed stably, the end of the first electrode lead-out part 21 facing the inside of the battery cell 102 protrudes from the surface of the end cover 25, and the first insulating member 4 is configured to be edge-turned And form a surrounding wall 43 extending along the axial direction P toward the end cover 25, the surrounding wall 43 surrounds the side wall 24 at the end of the first electrode lead-out part 21 facing the inside of the battery cell 102, so as to prevent the first electrode lead-out part 21 from contacting the first electrode lead-out part 21. The tabs 11 or the current collectors 6 are lapped and shorted.

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 . The battery cells 102 of the battery 100 are not easy to be short-circuited, and the battery 100 has high safety.

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 has high safety, good power supply stability, and the vehicle 1000 has a good sense of use.

In a fourth aspect, the embodiment of the present application provides a method for manufacturing a battery cell 102, as shown in FIG. 12 , the method includes:

S1. An electrode assembly 1 is provided. The electrode assembly 1 includes a first tab 11 and a second tab 12 with opposite polarities. end, 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 on the same side;

S3. Provide adapter 3;

S4. Providing the first insulating member 4;

S5, providing the second insulating member 5;

S6. Put the second insulator 5 and the adapter 3 through the winding center hole 13, and place the second insulator 5 between the outer peripheral surface 311 of the adapter 3 and the inner wall of the winding center hole 13; The adapter 3, the electrode assembly 1, the first insulator 4 and the second insulator 5 are put into the shell assembly 2, so that the side of the shell assembly 2 provided with the first electrode lead-out portion 21 and the second electrode lead-out portion 22 is close to The first tab 11, the first electrode lead-out portion 21 is electrically connected to the first tab 11, the second tab 12 is electrically connected to the second electrode lead-out portion 22 through the adapter 3, and the first insulating member 4 is positioned on the electrode The component 1 is provided with one end of the first tab 11 and sleeved on the adapter 3 to insulate and isolate the first tab 11 and the second electrode lead-out portion 22, and make one end of the second insulating member 5 abut against the first Insulation 4.

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 , S3 , S4 , and S5 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 of a battery cell 102, as shown in FIG. 13 , which includes:

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 along the edge of the electrode assembly 1. At both ends of the axial direction P, the electrode assembly 1 has a winding center hole 13;

The second providing device 72 is used to provide the 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, the first electrode lead-out part 21 and the second electrode lead-out part 22 are all arranged on the same side of the shell assembly 2;

The third providing device 73 is used to provide the adapter 3;

The fourth providing device 74 is used for providing the first insulating member 4;

The fifth providing device 75 is used for providing the second insulating member 5;

The first assembly device 76 is used to pass the second insulating member 5 and the adapter 3 through the winding center hole 13, and make the second insulating member 5 located on the outer peripheral surface 311 of the adapter 3 and the winding center hole 13 between the inner walls of

The second assembly device 77 is used to put the adapter 3, the electrode assembly 1, the first insulator 4 and the second insulator 5 into the shell assembly 2, so that the shell assembly 2 is provided with the first electrode lead-out part 21 and the second electrode lead-out part 21. One side of the second electrode lead-out part 22 is close to the first pole ear 11, the first electrode lead-out part 21 is electrically connected to the first pole ear 11, the second pole ear 12 is electrically connected to the second electrode lead-out part 22 through the adapter 3, And the first insulator 4 is located at one end of the electrode assembly 1 provided with the first tab 11 and sleeved on the adapter 3 to insulate and isolate the first tab 11 and the second electrode lead-out part 22, and make the second insulator One end of the element 5 abuts against the first insulating element 4 .

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 shell assembly 2 includes a cylindrical shell formed by a bottom wall 23, a side wall 24 and an end cover 25, and a first electrode lead-out part 21 and a second electrode lead-out part 22 for inputting or outputting electric energy, and the second electrode lead-out part 22 To insulate the electrode terminals mounted on the end cap 25 , the first electrode lead-out portion 21 is a portion of the end cap 25 located between the electrode terminals and the side wall 24 . A first tab 11 and a second tab 12 are respectively provided at both ends of the electrode assembly 1 in the axial direction. The polarities of the first tab 11 and the second tab 12 are opposite. The electrode assembly 1 has a winding center hole 13 . The electrode assembly 1 is disposed in the inner space of the shell assembly 2 , the first tab 11 of the electrode assembly 1 faces the end cap 25 , and the second tab 12 faces the bottom wall 23 . The first tab 11 and the end cap 25 are electrically connected through the current collector 6 . The first insulator 4 is located between the current collector 6 and the end cap 25 , and the first insulator 4 covers the surface of one end of the second electrode lead-out portion 22 inside the battery cell 102 . The current collector 6 is provided with an escape hole for avoiding the adapter 3 , and the first insulating member 4 is provided with a through hole 41 . The adapter piece 3 is passed through the winding center hole 13, and one end of the adapter piece 3 passes through the escape hole of the current collector 6 and the through hole 41 of the first insulating piece 4 to connect to the second electrode lead-out part 22, and the adapter piece The other end of 3 is connected to the second tab 12. The second insulator 5 is a cylindrical structure sleeved on the adapter 3 , and the second insulator 5 is located between the outer peripheral surface 311 of the adapter 3 and the inner wall of the winding center hole 13 . A protrusion 42 is formed on the side of the first insulator 4 facing away from the second electrode lead-out portion 22. The protrusion 42 passes through the avoidance hole of the current collector 6 and abuts against the end surface of the first insulator 4, so that the second electrode lead-out portion 22 and the adapter 3 are insulated and isolated from the opposite polarity components in the battery cell 102 .

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:

The electrode assembly includes a first tab and a second tab with opposite polarities, the first tab and the second tab are respectively located at both ends of the electrode assembly along its own axis, and the electrode assembly has Winding center 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 parts are all provided on the side of the shell component close to the first tab along the axial direction, and the first electrode lead-out part is electrically connected to the first tab;

An adapter piece is passed through the winding center hole, and the adapter piece is used to connect the second tab and the second electrode lead-out part, so as to realize the connection between the second tab and the second electrode. The electrical connection of the electrode lead-out part;

The first insulator is arranged at one end of the electrode assembly provided with the first tab and is provided with a through hole for the adapter to pass through, for insulating and isolating the first tab and the second electrode lead-out part;

The second insulating part is sleeved on the adapter and located between the outer peripheral surface of the adapter and the inner wall of the winding center hole;

Wherein, one end of the second insulating member abuts against the first insulating member.
The battery cell according to claim 1, wherein a protrusion is provided on a side of the first insulator facing away from the second electrode lead-out part, and the protrusion is arranged along the circumference of the through hole, and the The second insulator has a first end surface facing the second electrode lead-out portion, and the protrusion abuts against the first end surface along the axial direction.
The battery cell according to claim 2, wherein, along the axial direction toward the second insulator, the inner peripheral surface of the protrusion is inclined away from the outer peripheral surface of the adapter to form a slope or curved surface.
The battery cell according to claim 3, wherein a section of the protrusion in the axial direction is triangular or semicircular.
The battery cell according to any one of claims 2-4, wherein a groove is formed on the first end surface, and the protrusion is configured to be inserted into the groove and interfere with the groove Cooperate.
The battery cell according to any one of claims 2-5, wherein an end of the second insulating member facing the second electrode lead-out portion is located inside the winding center hole.
The battery cell according to any one of claims 2-6, wherein the second electrode lead-out portion has a second end face facing the inside of the battery cell, and the protrusion is positioned between the The projection on the second electrode lead-out part is located within the range of the second end surface.
The battery cell according to any one of claims 1-7, wherein there is a gap between the inner wall of the through hole and the outer peripheral surface of the adapter.
The battery cell according to claim 1, wherein an end of the second insulator facing the second electrode lead-out part protrudes into the through hole and is interference-fitted with the through hole.
A battery, wherein the battery comprises the battery cell according to any one of claims 1-9.
An electric device, wherein the electric device comprises the battery according to claim 10.
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 both ends of the electrode assembly along its own axis, The electrode assembly has a wound central 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 the same side of

Provide adapters;

providing a first insulating member;

providing a second insulating member;

The second insulating piece and the adapter piece are passed through the winding center hole, and the second insulating piece is located between the outer peripheral surface of the adapter piece and the inner wall of the winding center hole between; put the adapter, the electrode assembly, the first insulator and the second insulator into the shell assembly, so that the shell assembly is provided with the first electrode lead-out part and the One side of the second electrode lead-out portion is close to the first tab, the first electrode lead-out portion is electrically connected to the first tab, and the second electrode lead-out portion is connected to the second electrode lead-out portion through The adapter is electrically connected, and the first insulator is located at one end of the electrode assembly provided with the first lug and sleeved on the adapter, so as to insulate and isolate the first lug from the first lug. the second electrode lead-out portion, and make one end of the second insulator abut against the first insulator.
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 along the electrode assembly. At both ends in the axial direction, the electrode assembly has a winding 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 are located on the same side of the housing assembly;

The third providing device is used for providing the adapter;

fourth providing means for providing the first insulating member;

fifth providing means for providing a second insulating member;

The first assembling device is used to pass the second insulating piece and the adapter piece through the winding center hole, and make the second insulating piece be located on the outer peripheral surface of the adapter piece and the said adapter piece. Between the inner walls of the winding center hole;

The second assembly device is used to put the adapter, the electrode assembly, the first insulator and the second insulator into the shell assembly, so that the shell assembly is provided with the first One electrode lead-out portion and one side of the second electrode lead-out portion are close to the first tab, the first electrode lead-out portion is electrically connected to the first tab, and the second tab is connected to the first tab The two electrode lead-out parts are electrically connected through the adapter, and the first insulating member is located at the end of the electrode assembly provided with the first tab and sleeved on the adapter to insulate and isolate the first pole. a tab and the second electrode lead-out part, and make one end of the second insulator abut against the first insulator.