WO2023092502A1 - Battery cell, battery, electric device, and method and device for preparing battery cell - Google Patents

Abstract

The present application relates to the technical field of batteries, and in particular to a battery cell, a battery, an electric device, and a method and device for preparing a battery cell. The battery cell comprises: an electrode assembly, comprising a first tab and a second tab which have opposite polarities and are respectively located at two ends of the electrode assembly in the axial direction thereof, the electrode assembly having a winding center hole; a shell assembly, which comprises a first electrode leading-out portion and a second electrode leading-out portion for inputting or outputting electric energy, the electrode assembly being arranged inside the shell assembly, the first electrode leading-out portion and the second electrode leading-out portion both being arranged on the side of the shell assembly that is close to the first tab in the axial direction, and the first electrode leading-out portion being electrically connected to the first tab; and an adapter, which passes through the winding center hole and is used to connect the second tab to the second electrode leading-out portion to achieve electrical connection between the second tab and the second electrode leading-out portion.

Description

Battery cell, battery, electrical equipment and battery cell preparation 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 preparing 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 development of technology, higher requirements are put forward for the structure of the battery, and the structure of the battery tends to be simpler and more compact.

Contents of the invention

The present application aims to provide a battery cell, a battery, an electrical device, and a method and device for preparing the battery cell, so as to make the structure of the battery simpler and more compact.

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:

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 central hole; shell assembly, including 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 second electrode lead-out parts are all arranged on the side of the shell assembly close to the first tab along the axial direction, and the first electrode lead-out parts are electrically connected to the first tab; the adapter, 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 connection between the second tab and the second electrode lead-out part. electrical connection.

In the technical solution of the present application, the first tab and the second tab are respectively formed at both ends of the electrode assembly to effectively prevent the first tab and the second tab from overlapping short circuit, and by setting the first tab at the same end of the shell assembly The electrode lead-out part and the second electrode lead-out part, and the second tab is electrically connected to the second electrode lead-out part through the adapter, so as to realize the connection of the external bus component at the same end of the battery cell, in other words, at the same end of the battery cell The other end does not need to be provided with an external converging component, which saves the external space occupied by the battery cell and makes the external structure of the battery cell simpler and more compact. In addition, the adapter is installed in the winding center hole of the electrode assembly, which does not occupy the internal space of the battery cell. The internal structure of the battery cell is simple and compact, which will not reduce the energy density of the battery cell, ensuring that the battery cell has Higher energy density.

In addition, the end of the battery cell that is not provided with the electrode lead-out part can be set as a plane. When the plane is used as the placement surface or installation surface of the battery cell, the battery cell can be kept stable, and the problem of shaking caused by the unevenness of the battery cell can be alleviated. , so as to avoid damage to the components inside the battery cell and improve the safety of the battery cell.

From the perspective of production and processing, compared with the embodiment in which the external confluence components are respectively connected at both ends, the assembly speed of the external confluence components connected at the same end of the battery cell is accelerated and the production efficiency is improved; moreover, the first electrode The connection between the lead-out part and the first tab, and the connection between the second electric lead-out part and the adapter can also be completed at the same end of the battery cell, which is convenient for processing and improves production efficiency.

In one embodiment of the present application, the transition piece is a rigid piece, and the transition piece is configured to support the electrode assembly in a radial direction.

In the above technical solution, the adapter supports the electrode assembly in the winding center hole, so as to prevent the pole pieces of the electrode assembly from loosening inward in the radial direction, thereby avoiding the increase of the gap between adjacent pole pieces and causing lithium precipitation.

In one embodiment of the present application, the adapter is a hollow cylinder.

In the above technical solution, the shape and structure of the cylinder is convenient to pass through the winding center hole, which is convenient for assembly, and under the same mass, the volume of the hollow cylinder is relatively large, which can better support the winding center hole. In addition, the hollow cylinder can also be used as a coiling needle, and the electrode assembly is wound around the adapter, which saves the steps of pulling out the coiling needle and inserting the adapter, which is convenient for processing and prevents the pole piece of the electrode assembly from being pulled out of the coiling needle. Loose, and to prevent the pole pieces of the electrode assembly from wrinkling, scratching and other damage when the adapter is inserted into the winding center hole.

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, the current collector can at least cover part of the end face of the second tab, which increases the electrical connection area. By providing the current collector, the reliability of the electrical connection between the adapter and the second tab is improved. The electrical connection between the adapter piece and the second tab is convenient, and the connection efficiency is improved.

In an embodiment of the present application, the current collecting piece and the adapter piece are integrally formed.

In the above technical solution, the electrical connection reliability of the current collecting piece and the transition piece is further improved, the structure and processing steps are simplified, and the production efficiency is improved.

In one embodiment of the present application, the housing assembly includes a wall portion, the wall portion is the first electrode lead-out portion; the wall portion is provided with an electrode lead-out hole, and the second electrode lead-out portion is insulated and installed In the electrode extraction hole, at least part of the second electrode extraction portion protrudes outside the wall portion.

In the above technical solution, by using the wall part of the housing assembly as the first electrode lead-out part, the wall part can cover the end face of the first tab, which increases the electrical connection area and improves the connection between the first electrode lead-out part and the first tab. Excellent electrical connection reliability, convenient connection, and improved connection efficiency. By insulating the second electrode lead-out part on the wall and protruding the second electrode lead-out part from the outside of the wall, it is convenient for the first electrode lead-out part and the second electrode lead-out part to be respectively connected to external bus parts of different polarities, preventing Bonding of bus parts of different polarity causes a short circuit.

In one embodiment of the present application, the electrode assembly is a wound electrode assembly and includes a first pole piece, a second pole piece, and a spacer for isolating the first pole piece and the second pole piece. The first pole tab is formed on the first pole piece, and the second pole tab is formed on the second pole piece.

In the above technical solution, the first tab is formed on the first pole piece, and the second pole tab is formed on the second pole piece, so as to lead out the electric energy of the electrode assembly.

In one embodiment of the present application, the first pole piece is wound to form a stacked structure, and the stacked structure includes a first stacked area and a second stacked area, and the second stacked area surrounds the winding The outer side of the central hole, the first stacking area surrounds the outer side of the second stacking area, the first tab is only formed in the first stacking area, and is radially connected to the adapter A gap is formed.

In the above technical solution, a gap is provided between the first tab and the adapter to alleviate the problem of overlapping short circuit between the first tab and the adapter with opposite polarities, thereby improving the safety of the battery.

In an embodiment of the present application, the spacer is formed with a spacer in the gap for spaced apart from the first tab and the adapter, and the spacer faces the end of the wall The portion extends beyond the end portion of the second lamination region facing the wall portion in the axial direction.

In the above technical solution, the spacer is located in the gap between the first tab and the adapter, and plays the role of isolating the first tab and the adapter, so as to further prevent the first tab from overlapping with the adapter and cause short circuit, thereby improving the safety of the battery.

In one embodiment of the present application, the first pole piece is wound to form a stacked structure, and the stacked structure includes a first stacked area and a second stacked area, and the second stacked area surrounds the winding The outer side of the central hole, the first stacked area surrounds the outer side of the second stacked area, and the first tab includes a first sub-tab portion formed in the first stacked area and a first tab formed in the second stacked area. In the second sub-tab portion of the two-layered region, the end of the first sub-tab facing the wall exceeds the end of the second sub-tab facing the wall along the axial direction, and the A radial gap is formed between the first sub-tab portion and the adapter piece.

In the above technical solution, the length of the first sub-tab portion in the axial direction is longer than that of the second sub-tab portion, that is, it is relatively closer to the first electrode lead-out portion, which is convenient for connection with the first electrode lead-out portion, while the second The distance between the first sub-tab and the adapter is relatively large, the second sub-tab is between the first sub-tab and the adapter, the first sub-tab is not easy to fall down in the radial direction and Pass through the gap above the second sub-tab to overlap the adapter, and the length of the second sub-tab in the axial direction is relatively short, and the second sub-tab is not easy to fall down and overlap in the radial direction. Take the adapter.

In an embodiment of the present application, the spacer is formed with a spacer in the gap for spaced apart from the first tab and the adapter, and the spacer is located at the second sub-pole Between the ear portion and the adapter piece, the end portion of the spacer portion facing the wall portion exceeds the end portion of the second sub-tab portion facing the wall portion along the axial direction.

In the above technical solution, the distance between the second sub-tab and the adapter is relatively small, and the spacer is located between the second sub-tab and the adapter to isolate the second sub-tab from the adapter. The function of the connector is to further prevent the second sub-tab from overlapping with the adapter and cause a short circuit, thereby improving the safety of the battery cell.

In an embodiment of the present application, the end of the spacer facing the wall exceeds the end of the first sub-tab facing the wall along the axial direction.

In the above technical solution, the spacing part not only isolates the second sub-tab part from the adapter, but also further isolates the first sub-tab part from the adapter, so as to prevent the first sub-tab from passing through the gap to overlap and transfer components, reduce the risk of short circuit and improve the safety of battery cells.

In an embodiment of the present application, the innermost pole piece of the electrode assembly is the second pole piece.

In the above technical solution, the innermost pole piece of the electrode assembly surrounds and forms the winding center hole, and by setting the innermost pole piece of the electrode assembly as the second pole piece, the polarity of the second pole piece and the adapter piece Similarly, even if the second pole piece is overlapped with the adapter piece, it will not cause a short circuit, thereby improving the safety of the battery cell. On the other hand, because the contact between the second pole piece and the adapter will not cause a short circuit, the second pole piece and the adapter can be arranged as close as possible, and the gap between the two can be as small as possible, thereby improving the stability of the battery cell. Energy Density.

In an embodiment of the present application, a groove is formed on the end surface of the second electrode lead-out portion away from the electrode assembly, and the second electrode lead-out portion is located between the groove and the adapter piece. The intermediate part is welded with the adapter.

In the above technical solution, the groove marks the welding position on the outside of the second electrode lead-out part, and also plays the role of reducing the thickness of the second electrode lead-out part at the welding position, realizing the second electrode lead-out part and the adapter Fast soldering.

In an embodiment of the present application, the second electrode lead-out portion includes a first conductive layer and a second conductive layer stacked along the thickness direction of the wall portion, and the second conductive layer is A conductive layer is closer to the electrode assembly, and the second conductive layer is made of the same material as the adapter; the groove is recessed to the outer surface of the second conductive layer along the direction facing the electrode assembly , so that a part of the second conductive layer is exposed to the outside.

In the above technical solution, by setting the second electrode lead-out part as the first conductive layer and the second conductive layer, the first conductive layer and the second conductive layer can be made of different materials, so as to adjust the first conductive layer according to the material of the external bus component. The material of a conductive layer is such that the material of the first conductive layer is the same as the material of the external bus part, the material of the second conductive layer is the same as the material of the adapter, and the first conductive layer and the second conductive layer of different materials are passed through friction Welding and other processing methods are connected in advance to form the second electrode lead-out part, and grooves are set to expose part of the second conductive layer to the outside. During on-site processing, only conventional and convenient welding methods are required to complete the adapter. , The second electrode lead-out part and the external confluence part are welded sequentially, which effectively reduces the difficulty of on-site welding and improves assembly efficiency.

In an embodiment of the present application, the material of the first conductive layer is aluminum, and the material of the second conductive layer is copper.

In the above technical solution, copper has good electrical conductivity, relatively stable chemical properties, and relatively high hardness of copper. By making both the second conductive layer and the adapter piece copper, it is ensured that the adapter piece and the second conductive layer Layer abutment, so as to avoid gaps between the adapter and the second conductive layer resulting in false welding and improve welding quality; and by setting the material of the first conductive layer to aluminum, the external confluence member can be set to aluminum, which has a higher density Low and not easy to oxidize, which makes the mass of the external confluence member small and not easy to be rusted and damaged.

In one embodiment of the present application, the housing assembly includes a housing and an end cover, the housing includes a bottom wall and a side wall, the side wall surrounds the bottom wall, and the side wall One end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening opposite to the bottom wall, the end cover covers the opening, and the wall part is the bottom wall or the end cap.

In the above technical solution, the wall part is the bottom wall or the end cover, that is, the first electrode lead-out part is the bottom wall or the end cover, and the second electrode lead-out part is insulated on the bottom wall or the end cover, which is convenient for connecting the electrode assembly and the rotor. When the connector is placed inside the shell or when the end cap is closed, adjust the relative position of the electrode assembly and the first electrical outlet, and the position of the adapter and the second electrical outlet to ensure accurate and stable connection and improve electrical connection. reliability.

In an embodiment of the present application, the battery cell is a cylindrical battery cell.

In a second aspect, the present application provides a battery, which includes the aforementioned battery cells.

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

In a fourth aspect, the present application provides a method for preparing a battery cell, which includes:

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 winding central hole; a casing assembly is provided, the casing assembly includes a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electrical energy, the casing assembly is used to house the electrode assembly, Both the first electrode lead-out part and the second electrode lead-out part are arranged on a side of the housing assembly close to the first tab along the axial direction, and the first electrode lead-out part and the first electrode lead-out part are The tabs are electrically connected; an adapter is provided; the adapter is passed through the winding center hole, the electrode assembly and the adapter are placed inside the shell assembly, and the The adapters are respectively connected to 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.

In the fifth aspect, the present application provides a battery cell preparation 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, and the casing assembly includes a first electrode lead-out part and a second electrode lead-out part for inputting or outputting electric energy part, the shell assembly is used to accommodate the electrode assembly, and the first electrode lead-out part and the second electrode lead-out part are both arranged on a side of the shell assembly close to the first tab along the axial direction On the side, the first electrode lead-out part is electrically connected to the first tab; the third providing device is used to provide an adapter; the assembly device is used to pass the adapter through the winding center hole, put the electrode assembly and the adapter piece inside the housing assembly, and connect the adapter piece with the second tab and the second electrode lead-out part respectively, so as to realize the 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 the structural representation of the 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 a perspective view of a battery cell provided by an embodiment of the present application;

Fig. 4 is an exploded 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 schematic diagram of a welding position of a battery cell provided by an embodiment of the present application;

Fig. 7 is a layered structure diagram of the winding formation of the first pole piece provided by an embodiment of the present application;

Fig. 8 is a cross-sectional view of a battery cell provided by another embodiment of the present application;

FIG. 9 is a schematic flowchart of a method for preparing a battery cell provided by an embodiment of the present application;

FIG. 10 is a schematic block diagram of a battery cell manufacturing device provided by an embodiment of the present application.

Icons: 1000-vehicle; 100-battery; 101-box; 1011-first box part; 1012-second box part; 1-battery unit; 11-shell assembly; 11a-first electrode lead-out part; 11b-second electrode lead-out part; 11b1-groove; 11b2-first conductive layer; 11b3-second conductive layer; 111-housing; 1111-side wall; 1112-bottom wall; 1113-opening; 112-end cover 1121-body part; 1122-edge part; 1123-first insulating part; 1124-electrode lead-out hole; 113-second insulating part; 12-electrode assembly; 121-first pole piece; 121b-second stacking area; 1211-first tab; 1212-second tab; 123-winding center hole; 13-transfer piece; 14-current collector; 15-third insulating piece; 162-second confluence part; 200-motor; 300-controller; 400-preparation equipment; 410-first supply device; 420-second supply device; 430-third supply device; ; d1-gap; d2-second gap; P-axial; R-radial; W-welding.

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. For example, the battery mentioned in this application may include a battery module or a battery pack, and the like. 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 tab, and the positive electrode current collector is coated with a positive electrode active material layer , the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector 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, and the negative electrode current collector is coated with a negative electrode active material layer , the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes 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 shell assembly, and the inside of the shell assembly forms a sealed accommodation space for accommodating electrode assemblies, electrolytes and other functional components, so as to realize electrochemical reactions inside the shell assembly. An electrode lead-out part is provided on the shell assembly, and 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 output or input electric energy.

The battery further includes a bus member for connecting the electrode lead-out parts of the battery cells. A plurality of battery cells are electrically connected through the busbar, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells.

In the environment of pursuing energy saving and emission reduction, batteries are widely used in mobile phones, computers, electric vehicles and other electrical equipment. With the development of technology, higher requirements are placed on the structure of batteries, and the structure of batteries tends to be simpler and more compact. direction development.

The inventors found that in the battery, mainly the battery cells occupy more space. However, the internal structure of the battery cells is already very compact, and it is difficult to further reduce the volume of the battery cells, which makes it difficult to further reduce the volume of the battery. On this basis, the inventor considers simplifying the external structure of the battery cell. For example, the positive electrode lead-out part and the negative electrode lead-out part of the battery cell are often arranged on different surfaces of the casing assembly, such as two opposite surfaces. It is necessary to arrange a bus member on both sides of the casing assembly to connect the positive electrode lead-out part and the negative electrode lead-out part, which results in a larger height of the battery along the direction perpendicular to these two opposing surfaces, and if the positive electrode lead-out part and the negative electrode lead-out part are connected If the lead-out part of the negative electrode is set on the same side of the shell assembly, it is only necessary to set two confluence parts on the same side of the shell assembly to connect the lead-out part of the positive electrode and the lead-out part of the negative electrode respectively, so as to reduce the height of the battery and make the battery The structure is simpler and more compact.

However, for the sake of safety, the positive tab and the negative tab of the electrode assembly need to be arranged on opposite sides of the electrode assembly, so as to avoid short circuit caused by deformation of the positive tab and the negative tab. And from the perspective of production and processing, if the positive tab and the negative tab of the electrode assembly are set on the same side, it is also necessary to ensure that the positions of the positive tab and the negative tab are staggered, which affects the accuracy of the position distribution of the positive tab on the positive tab. The accuracy of the position distribution of the negative electrode tab on the negative electrode sheet puts forward higher requirements, which increases the processing difficulty and production cost. Based on the above situation, it is difficult to realize the purpose of arranging the positive electrode lead-out part and the negative electrode lead-out part on the same side of the casing assembly, so it is difficult to simplify the structure of the battery cell, and it is difficult to make the structure of the battery simpler and more compact.

In view of this, the embodiment of the present application provides a technical solution. The electrode assembly includes a first tab and a second tab with opposite polarities. Along the axial direction of the electrode assembly (hereinafter referred to as the axial direction), the electrode assembly has a winding central hole , and the first tab and the second tab are respectively located at both ends of the electrode assembly, and the shell assembly is provided with a first electrode lead-out part and a second electrode lead-out part on the side close to the first pole along the axial direction, the first electrode lead-out part It is electrically connected with the first tab, and the battery cell also includes an adapter, which is passed through the center hole of the winding, and is respectively connected with the second tab and the second electrode lead-out part, so as to realize the connection between the second tab and the second electrode lead-out part. The second electrode lead-out parts are electrically connected.

In the above scheme, the second tab is arranged at the end of the electrode assembly far away from the first tab, the first electrode lead-out part and the second electrode lead-out part, so as to avoid the deformation and overlapping of the second tab and the first tab. One end of the adapter is connected to the second tab, and the other end of the adapter is connected to the second electrode lead-out part through the winding center hole, so that the first tab and the second tab are separately arranged on the electrode assembly. In the case of both ends, the purpose of setting the first electrode lead-out part and the second electrode lead-out part on the same side of the shell assembly is achieved, so that the structure of the battery cell is simple and compact, and the confluence part can be connected on the same side of the battery cell, saving The external space occupied by battery cells and bus components is reduced, making the structure of the battery simpler and more compact.

In addition, although an adapter is added to the battery cell, the adapter is inserted through the winding center hole of the electrode assembly, which does not occupy the internal space of the battery cell. The internal structure of the battery cell is simple and compact, which will not cause The increase in the volume of the battery cell will not lead to a decrease in the energy density of the battery cell, ensuring that the battery cell has a higher energy density.

In addition, the end of the battery cell that is not provided with the electrode lead-out part can be set as a plane. When the plane is used as the placement surface or installation surface of the battery cell, the battery cell can be kept stable, and the problem of shaking caused by the unevenness of the battery cell can be alleviated. , so as to prevent the internal components from being damaged due to the shaking of the battery cell, thereby improving the safety of the battery cell.

From the perspective of production and processing, the position accuracy of the tabs has not been improved, and the processing difficulty and production cost have not increased. Moreover, the external confluence components connected at the same end of the battery cell are different from the external confluence components connected at both ends. , the assembly speed is accelerated, and the production efficiency is improved; moreover, the connection processing of the first electrode lead-out part and the first tab, and the connection process of the second electric lead-out part and the adapter can also be completed at the same end of the battery cell, The processing is convenient and the production efficiency is improved.

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

Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc. 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, the figure 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 a supercharged vehicle. program 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 1 , wherein the plurality of battery cells 1 are connected in series or in parallel or in combination, and the combination refers to a combination of series and parallel. mix. The battery 100 may also be called a battery 100 pack. Optionally, a plurality of battery cells 1 can be connected in series, parallel or mixed to form a battery module, and then a plurality of battery modules can be connected in series, parallel or mixed to form a battery 100 . That is to say, a plurality of battery cells 1 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), the interior of the box body 101 is a hollow structure, and a plurality of battery cells 1 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 a plurality of battery cells 1 , 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 1 are connected 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 .

The battery 100 also includes a confluence part (not shown in FIG. 2 ), which is used to realize the electrical connection between a plurality of battery cells 1 , such as parallel connection, series connection or mixed connection. Specifically, the current-combining component can realize the electrical connection between the battery cells 1 by connecting the electrode lead-out parts of the battery cells 1 . Further, the current-combining member can be fixed to the electrode lead-out portion of the battery cell 1 by welding. The electric energy of the plurality of battery cells 1 can be further drawn out through the case body 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 1 , as shown in FIG. 3 , FIG. 4 and FIG. 5 , the battery cell 1 includes an electrode assembly 12 , a casing assembly 11 and an adapter 13 . The electrode assembly 12 includes a first tab 1211 and a second tab 1212 with opposite polarities. The first tab 1211 and the second tab 1212 are respectively located at both ends of the electrode assembly 12 along its own axial direction P. The electrode assembly 12 has a roll around the center hole 123 . The shell assembly 11 includes a first electrode lead-out portion 11a and a second electrode lead-out portion 11b for inputting or outputting electric energy. The inside of the shell assembly 11 is provided with an electrode assembly 12, and the first electrode lead-out portion 11a and the second electrode lead-out portion 11b are both The first electrode lead-out portion 11 a is electrically connected to the first pole ear 1211 and is located on the side of the housing assembly 11 along the axial direction P close to the first pole ear 1211 . The adapter 13 is passed through the winding center hole 123, and the adapter 13 is used to connect the second tab 1212 and the second electrode lead-out part 11b, so as to realize the electrical connection between the second tab 1212 and the second electrode lead-out part 11b .

The electrode assembly 12 includes a first pole piece 121 , a second pole piece and a spacer, and the spacer is used to separate the first pole piece 121 from the second pole piece. The polarities of the first pole piece 121 and the second pole piece are opposite. In other words, one of the first pole piece 121 and the second pole piece is a positive pole piece, and the other of the first pole piece 121 and the second pole piece is positive. The one is the negative pole piece. The first pole piece 121, 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 pole piece 121 , the second pole piece and the spacer are all strip structures, and the first pole piece 121 , the second pole piece and the spacer are wound around the central axis to form a winding structure. The wound structure can be a cylindrical structure, a flat structure or other shapes. During winding, the first pole piece 121 , the second pole piece and the separator are wound around a winding needle, and after the winding needle is pulled out, a winding center hole 123 is formed at the central axis of the electrode assembly 12 . The axial direction P of the electrode assembly 12 mentioned in this application refers to the extension direction of the central axis of the electrode assembly 12 . The radial direction R of the electrode assembly 12 refers to a direction perpendicular to the axial direction P.

Optionally, the first tab 1211 is wound in multiple turns around the central axis of the electrode assembly 12 , in other words, the first tab 1211 includes multiple turns of the tab layer. After the winding is completed, the first tab 1211 is generally cylindrical, and there is a gap between two adjacent tab layers. In the embodiment of the present application, the first tab 1211 can be processed to reduce the gap between the tab layers, so as to facilitate the connection between the first tab 1211 and the first electrode lead-out portion 11a. For example, in the embodiment of the present application, the first tab 1211 may be flattened so that the end area of the first tab 1211 away from the main body is gathered together; One end of the part forms a dense end surface, which reduces the gap between the tab layers and facilitates the connection of the first tab 1211 with the first electrode lead-out part 11a. Alternatively, in the embodiment of the present application, a conductive material may also be filled between two adjacent tab layers, so as to reduce the gap between the tab layers. Similarly, the second tab 1212 is wound in multiple turns around the central axis of the electrode assembly 12 , and the second tab 1212 includes multiple turns of the tab layer. Exemplarily, the second tab 1212 is also smoothed or filled with conductive material, so as to reduce the gap between the tab layers of the second tab 1212 .

As shown in FIG. 4 and FIG. 5 , from the appearance of the electrode assembly 12, along the axial direction P of the electrode assembly 12, the electrode assembly 12 sequentially includes a first tab 1211, a main part of the electrode assembly 12, and a second tab 1212, The first tab 1211 and the second tab 1212 protrude from the main body of the electrode assembly 12 . The first tab 1211 is the part of the first pole piece 121 not coated with the active material layer, and the second tab 1212 is the part of the second pole piece not coated with the active material layer. The first tab 1211 and the second tab 1212 are respectively disposed at both ends of the main body of the electrode assembly 12 , that is, the first tab 1211 and the second tab 1212 are respectively located at both ends of the electrode assembly 12 .

The casing assembly 11 is a hollow structure, and a space for accommodating the electrode assembly 12 is formed inside it. The shape of the housing assembly 11 can be determined according to the specific shape of the electrode assembly 12 . For example, if the electrode assembly 12 has a cylindrical structure, the shell assembly 11 can be a cylindrical structure; if the electrode assembly 12 is a rectangular parallelepiped, the shell assembly 11 can be a rectangular parallelepiped. Optionally, both the electrode assembly 12 and the shell assembly 11 are cylindrical.

The first electrode lead-out part 11a and the second electrode lead-out part 11b are the structures on the shell assembly 11 for realizing the electrical connection inside and outside the battery cell 1, and the first electrode lead-out part 11a and the second electrode lead-out part 11b respectively have The inner part and the outer part of the shell assembly 11 are used to realize the output and input of electric energy.

The first electrode lead-out portion 11a and the second electrode lead-out portion 11b are located on the same side of the housing assembly 11, which means that the first electrode lead-out portion 11a and the second electrode lead-out portion 11b are arranged on the wall of the same side of the shell assembly 11, exemplarily Specifically, as shown in FIGS. 3-6 , when the housing assembly 11 is a cylinder, the first electrode lead-out portion 11 a and the second electrode lead-out portion 11 b are located on the same end face of the cylinder. A part of the first electrode lead-out portion 11 a outside the casing assembly 11 is connected to the first flow-combining member 161 , and a portion of the second motor lead-out portion outside the casing assembly 11 is connected to the second flow-combining member. A portion of the first electrode lead-out portion 11 a inside the housing assembly 11 is connected to the first tab 1211 .

The adapter 13 is a component for electrically connecting the second tab 1212 of the battery cell 1 with the second electrode lead-out portion 11b. The part of the second electrode lead-out part 11b located inside the shell assembly 11 is connected to the second tab 1212 through the adapter 13, that is, one end of the adapter 13 is connected to the second tab 1212, and the other end passes through the electrode assembly 12. The winding center hole 123 is connected to the second electrode lead-out portion 11b, so that current can be delivered between the second tab 1212 and the second electrode lead-out portion 11b.

Optionally, the electrical connection mentioned in this application may be welding or bonding through conductive glue. For example, from the outside of the housing assembly 11, the second electrode lead-out part 11b is welded together with the adapter 13, and the first electrode lead-out part 11a and the first tab 1211 are welded together, as shown in FIG. 6 shows the location of the solder print W. As another example, conductive glue is provided between the adapter 13 and the second electrode lead-out portion 11b, and conductive glue is set between the first tab 1211 and the first electrode lead-out portion 11a.

By forming the first tab 1211 and the second tab 1212 at both ends of the electrode assembly 12, the overlapping short circuit of the first tab 1211 and the second tab 1212 can be effectively prevented, and by setting the second tab at the same end of the shell assembly 11 An electrode lead-out part 11a and a second electrode lead-out part 11b, and the second tab 1212 is electrically connected to the second electrode lead-out part 11b through the adapter 13, realizing the connection of an external bus component at the same end of the battery cell 1, The external space occupied by the battery cell 1 is saved, making the external structure of the battery cell 1 simpler and more compact. Moreover, the adapter 13 is passed through the winding center hole 123 of the electrode assembly 12, without additionally occupying the internal space of the battery cell 1, and the internal structure of the battery cell 1 is simple and compact, which will not reduce the energy density of the battery cell 1. , to ensure that the battery cell 1 has a higher energy density.

In addition, the end of the battery cell 1 that is not provided with the electrode lead-out part can be set as a plane, and when the plane is used as a placement surface or an installation surface of the battery cell 1, the battery cell 1 can be kept stable, and the instability of the battery cell 1 can be alleviated. The problem of shaking is caused, so as to prevent the components inside the battery cell 1 from being damaged, and improve the safety of the battery cell 1 .

From the perspective of production and processing, the assembly speed of the external confluence parts connected at the same end of the battery cell 1 is faster than that of the external confluence parts connected at both ends, and the production efficiency is improved; moreover, the first electrode lead-out part The connection processing between 11a and the first tab 1211, and the connection processing between the second electrical lead-out part and the adapter 13 can also be completed at the same end of the battery cell 1, which is convenient for processing and improves production efficiency.

According to some embodiments of the present application, the adapter piece 13 is a rigid piece, and the adapter piece 13 is configured to support the electrode assembly 12 along the radial direction R.

The adapter piece 13 being a rigid piece means that the adapter piece 13 is made of a material with certain rigidity, so as to support the electrode assembly 12 in the winding center hole 123 . Exemplarily, the adapter piece 13 at least partially abuts against the inner wall of the winding center hole 123 to support the winding center hole 123 .

By using the adapter 13 to support the electrode assembly 12 in the winding center hole 123, the winding center hole 123 is prevented from collapsing, and the pole pieces of the electrode assembly 12 are prevented from being loose inward along the radial direction R, so as to avoid the gap between adjacent pole pieces. The increase of the gap d1 leads to lithium precipitation.

According to some embodiments of the present application, as shown in FIG. 5 , the adapter 13 is a hollow cylinder.

In the above technical solution, by setting the adapter 13 as a hollow cylinder, the shape of the cylinder is convenient to pass through the winding center hole 123, which has the effect of convenient assembly, and under the same quality, the volume of the hollow cylinder is relatively large , can better support the winding center hole 123 .

On the other hand, the hollow cylinder can also be used as a coiling needle, and the electrode assembly 12 is directly wound around the adapter 13, which saves the steps of pulling out the coiling needle and inserting the adapter 13, which is convenient for processing and prevents the extraction of the coiling needle. This causes the pole pieces of the electrode assembly 12 to loosen, and prevents the pole pieces of the electrode assembly 12 from being wrinkled, scratched and other damages when the adapter 13 is inserted into the winding center hole 123 .

According to some embodiments of the present application, as shown in FIG. 5 , the battery cell 1 further includes a current collector 14 , the current collector 14 is attached to the second tab 1212 and is used to connect the second tab 1212 to the adapter 13, so as to realize the electrical connection between the second tab 1212 and the adapter 13.

The current collector 14 is a part used to electrically connect the second tab 1212 of the battery cell 1 with the adapter 13. Through the current collector 14 and the adapter 13, the electric energy is transmitted from the electrode assembly 12 to the second electrode assembly 12. The electrode lead-out part 11b is so as to be transported to the outside of the battery cell 1 through the second electrode lead-out part 11b.

By setting the current collecting piece 14, the current collecting piece 14 can at least cover part of the end surface of the second tab 1212, so as to increase the electrical connection area between the adapter piece 13 and the second tab 1212, improve the flow capacity, and improve the transition. The reliability of the electrical connection between the component 13 and the second tab 1212. By providing the current collecting piece 14, the electrical connection between the adapter piece 13 and the second tab 1212 is also facilitated, and the connection efficiency is improved.

According to some embodiments of the present application, the current collecting piece 14 and the adapter piece 13 are integrally formed.

The integral formation of the current collecting piece 14 and the adapter piece 13 means that the current collecting piece 14 and the adapter piece 13 are cast as one, or welded or bonded as one before assembly.

During the assembly process, inserting the adapter 13 makes the current collector 14 close to the second tab 1212 of the electrode assembly 12, which facilitates the connection of the current collector 14 to the second tab 1212 of the electrode assembly, facilitates processing, and improves production efficiency .

In the above technical solution, the reliability of the electrical connection between the current collecting piece 14 and the connecting piece 13 is further improved by arranging the current collecting piece 14 and the adapter piece 13 to be integrally formed.

According to some embodiments of the present application, as shown in FIG. 4 and FIG. 5, the housing assembly 11 includes a wall portion, the wall portion is the first electrode lead-out portion 11a; the wall portion is provided with an electrode lead-out hole 1124, and the second electrode lead-out portion 11b is insulated. Installed in the electrode lead-out hole 1124, at least part of the second electrode lead-out portion 11b protrudes outside the wall.

The wall part is an end wall of one end of the casing assembly 11 , the wall part faces the first tab 1211 of the electrode assembly 12 , and the end of the casing away from the wall part faces the second tab 1212 of the electrode assembly 12 . Optionally, the wall portion of the housing assembly 11 serves as the first electrode lead-out portion 11a, and the wall portion can cover the end surface of the first tab 1211, thereby increasing the electrical connection area and improving the connection between the first electrode lead-out portion 11a and the first tab. 1211's electrical connection is reliable, and the connection is convenient, which improves the connection efficiency.

The electrode lead-out hole 1124 penetrates the wall so that the inside of the wall communicates with the outside of the wall. The inside of the wall is the inside of the housing, and the outside of the wall is the outside of the housing. The second electrode lead-out part 11 b is installed in the electrode lead-out hole 1124 for realizing the electrical connection between the second tab 1212 of the electrode assembly 12 and the second bus part 162 . As shown in Figure 5, a first insulating member 1123 is provided between the second electrode lead-out portion 11b and the wall, and the first insulating member 1123 separates the second electrode lead-out portion 11b from the wall, specifically, the first insulating member 1123 separates at least the inner wall of the electrode lead-out hole 1124 from the second electrode lead-out portion 11b, so as to prevent the wall portion from being electrically connected to the second electrode lead-out portion 11b and short circuited.

By installing the second electrode lead-out portion 11b insulated on the wall and making the second electrode lead-out portion 11b protrude outside the wall, the second electrode lead-out portion 11b protrudes from the wall serving as the first electrode lead-out portion 11a part, to prevent the overlapping of the first current-combining component 161 and the second current-combining component 162 of different polarities to cause a short circuit.

According to some embodiments of the present application, the electrode assembly 12 is a wound electrode assembly 12 and includes a first pole piece 121, a second pole piece and a separator for isolating the first pole piece 121 and the second pole piece. The tab 1211 is formed on the first pole piece 121 , and the second pole tab 1212 is formed on the second pole piece.

As previously mentioned, the first pole piece 121, the second pole piece and the spacer are strip-shaped structures, the first pole piece 121 and the second pole piece are stacked, and between the first pole piece 121 and the second pole piece A spacer is arranged between them, and then the first pole piece 121, the second pole piece and the spacer are wound together around the central axis as a whole to form a winding structure. The number of separators is two or more, so as to ensure that the first pole piece 121 and the second pole piece in the winding structure are completely isolated.

According to some embodiments of the present application, as shown in FIG. 5 and FIG. 7 , the first pole piece 121 is wound to form a laminated structure, the laminated structure includes a first laminated region 121a and a second laminated region 121b, and the second laminated region 121b surrounds On the outer side of the winding center hole 123, the first lamination area 121a surrounds the outer side of the second lamination area 121b, the first tab 1211 is only formed in the first lamination area 121a, and is connected to the adapter 13 along the radial direction R A gap d1 is formed.

As mentioned above, the first tab 1211 includes a multi-turn tab layer. The first tab 1211 is only formed in the first lamination region 121a, which means that the multi-turn first pole piece 121 layer of the first lamination region 121a is formed with the first tab 1211. The multi-turn mentioned herein refers to two turns and two turns circle above. Since the second lamination region 121b relatively close to the winding center hole 123 does not form the first tab 1211 for connecting the first electrode lead-out portion 11a , a gap d1 is formed between the first tab 1211 and the adapter 13 .

By setting the gap d1 between the first tab 1211 and the adapter 13, the first tab 1211 is not easy to overlap with the adapter 13, so as to ease the overlapping of the first tab 1211 with opposite polarity and the adapter 13 The problem of short circuit is improved, and the safety of the battery 100 is improved.

Optionally, the spacer is formed with a spacer (not shown in the figure) for spacing the first tab 1211 and the adapter 13 in the gap d1, and the end of the spacer facing the wall exceeds the second pole in the axial direction P. The lamination region 121b faces the end of the wall.

As mentioned above, the spacer is a part used to isolate the first pole piece 121 and the second pole piece. The part of tab 1212.

In the above technical solution, the spacer is located in the gap d1 between the first tab 1211 and the adapter 13, and plays a role of isolating the first tab 1211 and the adapter 13, so as to further prevent the first tab 1211 from contacting the adapter 13. The overlapping of the adapters 13 leads to a short circuit, thereby improving the safety of the battery.

According to some embodiments of the present application, as shown in FIG. 7 , the first pole piece 121 is wound to form a laminated structure, the laminated structure includes a first laminated region 121a and a second laminated region 121b, and the second laminated region 121b is wound around Outside the central hole 123, the first lamination region 121a surrounds the outside of the second lamination region 121b, and the first tab 1211 includes a first sub-tab portion (not shown) formed in the first lamination region 121a and a In the second sub-tab portion (not shown in the figure) of the second lamination region 121b, the end portion of the first sub-tab portion facing the wall portion exceeds the end portion of the second sub-tab portion facing the wall portion in the axial direction P , and a gap d1 is formed along the radial direction R between the first sub-tab portion and the adapter piece 13 .

In the above technical solution, both the first stacked region 121a and the second stacked region 121b form the first tab 1211, the first tab 1211 includes a first sub-tab part and a second sub-tab part, the first sub-tab The part of the first pole piece 121 in the first lamination region 121a extends along the axial direction P toward the wall, and the second sub-lug part is the part of the first pole piece 121 in the second lamination region 121b along the axial direction P toward the wall. The wall is formed by extension. Wherein, the length of the first pole piece 121 extending in the first lamination region 121a is relatively long, and the length of the first pole piece 121 extending in the second lamination region 121b is relatively short.

Since the length of the first sub-tab portion along the axial direction P is relatively long, the first sub-tab portion is relatively closer to the first electrode lead-out portion 11a for easy connection with the first electrode lead-out portion 11a, while the first sub-tab portion The distance between the tab part and the adapter piece 13 is relatively large, the second sub-tab part is between the first sub-tab part and the adapter part 13, and the first sub-tab part is not easy to fall along the radial direction R And pass through the gap d1 above the second sub-tab to overlap the adapter 13, and the length of the second sub-tab along the axial direction P is relatively short, and the second sub-tab is not easy to move along the radial direction. Lay down toward R to overlap the adapter 13 .

Optionally, the spacer is formed with a spacer for separating the first tab 1211 and the adapter 13 in the gap d1, the spacer is located between the second sub-tab and the adapter 13, and the spacer faces the wall The end portion of the second sub-tab portion protrudes from the end portion of the second sub-tab portion facing the wall portion in the axial direction P.

There is a gap d1 between the first tab 1211 and the adapter 13, as shown in Figure 7, there is also a gap d1 between the second tab 1212 and the adapter 13 (hereinafter referred to as the second gap d2), the gap d1 A second gap d2 is included. Optionally, the size of the second gap d2 is consistent with the thickness of the spacer, that is, just accommodates the spacer.

In the above technical solution, the second gap d2 is smaller than the gap d1, that is, the distance between the second sub-tab portion and the adapter piece 13 is relatively small, and the spacer is located between the second sub-tab portion and the adapter piece 13 , play the role of isolating the second sub-tab portion and the adapter 13 to further prevent the second sub-tab from overlapping with the adapter 13 and cause a short circuit, thereby improving the safety of the battery cell 1 .

Optionally, the end of the spacer facing the wall exceeds the end of the first sub-tab facing the wall in the axial direction P.

The protruding mentioned here means that the end of the spacer facing the wall is closer to the wall than the end of the first sub-tab facing the wall.

In the above technical solution, the length of the spacer>the length of the first sub-tab>the length of the second sub-tab, the spacer not only isolates the second sub-tab from the adapter 13, but also further isolates the first sub-tab. The sub-tab and the adapter 13 are used to prevent the first sub-tab from passing through the gap d1 to overlap the adapter 13 , reducing the risk of short circuit and improving the safety of the battery cell 1 .

According to some embodiments of the present application, the innermost pole piece of the electrode assembly 12 is the second pole piece.

The winding center hole 123 is surrounded by the innermost pole piece of the electrode assembly 12 . By setting the innermost pole piece of the electrode assembly 12 as the second pole piece, since the polarity of the second pole piece is the same as that of the adapter piece 13, when the adapter piece 13 passes through the winding center hole 123, even with the second pole piece The pole piece contact will not cause a short circuit, which improves the safety of the battery cell 1 .

On the other hand, because the contact between the second pole piece and the adapter 13 will not cause a short circuit, the second pole piece and the adapter 13 can be arranged as close as possible, and the gap d1 between the two is as small as possible, thereby improving the battery life. The energy density of the monomer 1 also ensures the supporting effect of the adapter 13 on the winding center hole 123 .

According to some embodiments of the present application, as shown in FIG. 8, a groove 11b1 is formed on the end surface of the second electrode lead-out portion 11b away from the electrode assembly 12, and the second electrode lead-out portion 11b is located between the groove 11b1 and the adapter 13. The part between is welded with adapter piece 13.

The portion of the second electrode lead-out portion 11b located between the groove 11b1 and the adapter piece 13 is the portion of the second electrode lead-out portion 11b opposite to the notch of the groove 11b1 .

The groove 11b1 marks the welding position on the outside of the second electrode lead-out part 11b, so as to facilitate the welding operation. On the other hand, by setting the groove 11b1 , the thickness of the second electrode lead-out portion 11b at the welding position is reduced, which facilitates heat conduction and facilitates rapid welding of the second electrode lead-out portion 11b and the adapter 13 .

According to some embodiments of the present application, as shown in FIG. 8 , the second electrode lead-out portion 11b includes a first conductive layer 11b2 and a second conductive layer 11b3 stacked along the thickness direction of the wall portion, and the second conductive layer 11b3 is more A conductive layer 11b2 is closer to the electrode assembly 12, and the second conductive layer 11b3 is made of the same material as the adapter 13; the groove 11b1 is recessed to the outer surface of the second conductive layer 11b3 along the direction facing the electrode assembly 12, so that the second A partial area of the conductive layer 11b3 is exposed to the outside.

By setting the second electrode lead-out part 11b as the first conductive layer 11b2 and the second conductive layer 11b3, the first conductive layer 11b2 and the second conductive layer 11b3 can be made of different materials, so as to adjust the first The material of the conductive layer 11b2 is such that the material of the first conductive layer 11b2 is the same as that of the external bus component, the material of the second conductive layer 11b3 is the same as that of the adapter 13, and the first conductive layer 11b2 and the second conductive layer of different materials The conductive layer 11b3 is connected in advance by friction welding to form the second electrode lead-out part 11b, and the groove 11b1 is set so that part of the second conductive layer 11b3 is exposed to the outside. Only conventional and convenient welding is required for on-site processing. In this way, the sequential welding of the adapter piece 13, the second electrode lead-out portion 11b and the external confluence component can be completed, which effectively reduces the difficulty of on-site welding and improves assembly efficiency.

According to some embodiments of the present application, the material of the first conductive layer 11b2 is aluminum, and the material of the second conductive layer 11b3 is copper.

Copper has good electrical conductivity, relatively stable chemical properties, and relatively high hardness of copper. By making the second conductive layer 11b3 and the adapter 13 all made of copper, it is ensured that the adapter 13 and the second conductive layer 11b3 are in contact with each other. In order to prevent the gap d1 between the adapter 13 and the second conductive layer 11b3 from causing false welding and improve the welding quality.

By setting the material of the first conductive layer 11b2 as aluminum, the external current collecting member can be provided as aluminum, which has low density and is not easy to oxidize, which makes the mass of the external current collecting member small and not easy to be rusted and damaged.

According to some embodiments of the present application, as shown in FIG. 5 , the housing assembly 11 includes a housing 111 and an end cover 112, the housing 111 includes a bottom wall 1112 and a side wall 1111, and the side wall 1111 is surrounded by the bottom wall 1112, One end of the side wall 1111 is connected to the bottom wall 1112 , the other end of the side wall 1111 encloses an opening 1113 opposite to the bottom wall 1112 , the end cover 112 covers the opening 1113 , and the wall is the bottom wall 1112 or the end cover 112 .

The housing 111 is used to accommodate functional components such as the electrode assembly 12 and the electrolyte. The housing 111 can be in various shapes and sizes, such as cuboid, cylinder, hexagonal prism and so on. Optionally, when the shell is a cylinder, the casing 111 is a part of the cylinder.

The end cover 112 refers to a component that covers the opening 1113 of the casing 111 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 112 can be adapted to the shape of the housing 111 to fit the housing 111 . Optionally, when the shell is a cylinder, the end cap 112 is another part of the cylinder. Optionally, the end cap 112 can be made of a material (such as aluminum alloy) with a certain hardness and strength, so that the end cap 112 is not easily deformed when being squeezed and collided, so that the battery cell 1 can have a higher Structural strength and safety performance can also be improved.

The housing 111 and the end cover 112 can be independent components, and an opening 1113 can be provided on the housing 111 , and the internal environment of the battery cell 1 can be formed by making the end cover 112 cover the opening 1113 at the opening 1113 . Without limitation, the end cover 112 and the housing 111 can also be integrated. Specifically, the end cover 112 and the housing 111 can form a common connection surface before other components are inserted into the housing. When the inside of the housing 111 needs to be encapsulated , then make the end cover 112 cover the housing 111.

The accompanying drawings of this application description show an embodiment in which the wall is an end cover 112. In other embodiments, the wall may also be a bottom wall 1112, and the bottom wall 1112 is provided with an electrode lead-out hole 1124. The second electrode lead-out part 11b The electrode lead-out holes 1124 pass through the end cap 112 . That is, one of the bottom wall 1112 and the end cap 112 is provided with the first electrode drawing part 11a and the second electrode drawing part 11b.

By insulating the first electrode lead-out part 11a and the second electrode lead-out part 11b on the bottom wall 1112 or the end cover 112, it is convenient to put the electrode assembly 12 and the adapter 13 into the housing 111 or cover the end cover At 112, adjust the relative position between the electrode assembly 12 and the first electrical lead-out part, and the position of the adapter 13 and the second electric lead-out part, so as to ensure accurate and stable connection and improve the reliability of electrical connection.

Optionally, as shown in FIG. 8, the battery cell 1 further includes a second insulator 113, and the second insulator 113 is located between the end cap 112 and the casing 111 to insulate and isolate the end cap 112 and the casing 111 to prevent The casing 111 is live, reducing the risk of short circuit. Exemplarily, the end cap 112 includes a body portion 1121 and an edge portion 1122, the edge portion 1122 is connected to the outer periphery of the body portion 1121, an annular groove for accommodating the edge portion 1122 is formed on the housing 111, and the second insulating member 113 covers the edge The portion 1122 is used to isolate the inner wall of the annular groove from the surface of the edge portion 1122 . Optionally, the body portion 1121 protrudes toward the electrode assembly 12 relative to the edge portion 1122 , so as to facilitate connection with the first tab 1211 .

Optionally, as shown in FIG. 8 , the battery cell 1 further includes a third insulator 15 , and the third insulator 15 is located between the casing and the second tab 1212 , so as to prevent the casing from being electrified and reduce the risk of short circuit. Optionally, when the battery cell 1 is provided with the current collector 14, the third insulating member 15 is located between the current collector 14 and the casing.

According to some embodiments of the present application, as shown in FIG. 3 , the battery cell 1 is a cylindrical battery cell 1 .

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 1 .

In a third aspect, the present application provides an electric device. As shown in FIG. 1 , the electric device includes the aforementioned battery 100 .

In a fourth aspect, the present application provides a method for preparing a battery cell 1 , as shown in FIG. 9 . FIG. 9 shows a schematic flow chart of a method for preparing a battery cell 1 provided in some embodiments of the present application. The preparation method include:

S101. Provide an electrode assembly 12. The electrode assembly 12 includes a first tab 1211 and a second tab 1212 with opposite polarities. end, the electrode assembly 12 has a winding center hole 123;

S102. Provide a shell assembly 11, the shell assembly 11 includes a first electrode lead-out portion 11a and a second electrode lead-out portion 11b for inputting or outputting electrical energy, the shell assembly 11 is used to house the electrode assembly 12, the first electrode lead-out portion 11a and the second electrode lead-out portion 11b The two electrode lead-out parts 11b are both arranged on the side of the housing assembly 11 along the axial direction P close to the first tab 1211, and the first electrode lead-out part 11a is electrically connected to the first tab 1211;

S103, providing an adapter 13;

S104, passing the adapter 13 through the winding center hole 123, putting the electrode assembly 12 and the adapter 13 into the inside of the housing assembly 11, and connecting the adapter 13 to the second tab 1212 and the second electrode respectively The leading part 11b is connected to realize the electrical connection between the second tab 1212 and the second electrode leading part 11b.

It should be noted that, for the related structure of the battery cell 1 manufactured by the above-mentioned manufacturing method of the battery cell 1 , reference may be made to the battery cell 1 provided in the above-mentioned embodiments.

When assembling the battery cell 1 based on the above-mentioned manufacturing method of the battery cell 1, it is not necessary to follow the above steps sequentially, that is to say, the steps may be performed in the order mentioned in the embodiment, or it may be different from that mentioned in the embodiment. The steps are executed in sequence, or several steps are executed simultaneously. For example, steps S101, S102, and S103 are executed in no particular order, and may also be executed simultaneously.

In the fifth aspect, the embodiment of the present application provides a preparation device 400 for a battery cell 1 , as shown in FIG. 10 , which shows a schematic block diagram of the preparation device 400 for a battery cell 1 provided by some embodiments of the present application. , the preparation equipment 400 includes:

The first providing device 410 is used to provide the electrode assembly 12. The electrode assembly 12 includes a first tab 1211 and a second tab 1212 with opposite polarities. The first tab 1211 and the second tab 1212 are respectively located along the edge of the electrode assembly 12. At both ends of the axial direction P, the electrode assembly 12 has a winding center hole 123;

The second providing device 420 is used to provide the shell assembly 11, the shell assembly 11 includes a first electrode lead-out portion 11a and a second electrode lead-out portion 11b for inputting or outputting electric energy, the shell assembly 11 is used to accommodate the electrode assembly 12, the first The electrode lead-out part 11a and the second electrode lead-out part 11b are both arranged on the side of the housing assembly 11 along the axial direction P close to the first tab 1211, and the first electrode lead-out part 11a is electrically connected to the first tab 1211;

The third providing device 430 is used for providing the adapter 13;

The assembly device 440 is used to pass the adapter 13 through the winding center hole 123, put the electrode assembly 12 and the adapter 13 into the inside of the shell assembly 11, and connect the adapter 13 to the second tab 1212 respectively. It is connected with the second electrode lead-out part 11b to realize the electrical connection between the second tab 1212 and the second electrode lead-out part 11b.

For the relevant structure of the battery cell 1 manufactured by the above-mentioned manufacturing equipment 400 , reference may be made to the battery cell 1 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 FIGS. 3-5 , the embodiment of the present application provides a cylindrical battery cell 1 , and the battery cell 1 includes an electrode assembly 12 , a casing assembly 11 and an adapter 13 . The electrode assembly 12 includes a first tab 1211 and a second tab 1212 with opposite polarities. The first tab 1211 and the second tab 1212 are respectively located at both ends of the electrode assembly 12 along its own axial direction P. The electrode assembly 12 has a roll around the center hole 123 . The shell assembly 11 includes a housing 111 and an end cover 112. The housing 111 includes a bottom wall 1112 and a side wall 1111. The side wall 1111 surrounds the bottom wall 1112. One end of the side wall 1111 is connected to the bottom wall 1112. The side wall 1111 The other end of the body forms an opening 1113 opposite to the bottom wall 1112. The end cover 112 covers the opening 1113. A second insulator 113 is provided between the end cover 112 and the casing 111 for insulation isolation. The electrode assembly 12 is arranged on the shell assembly 11 Inside, the end cap 112 faces the side of the electrode assembly 12 with the first tab 1211 , and the side of the electrode assembly 12 with the second tab 1212 is provided between the side of the electrode assembly 12 with the second tab 1212 and the casing 111 for insulation isolation. The end cap 112 includes a first electrode lead-out portion 11a and a second electrode lead-out portion 11b for inputting or outputting electrical energy, the body portion 1121 of the end cap 112 can be used as the first electrode lead-out portion 11a, and the first electrode lead-out portion 11a is connected to the first electrode lead-out portion 11b. The tab 1211 is electrically connected, the second electrode lead-out part 11b is insulated and installed on the end cover 112, the adapter 13 is passed through the winding center hole 123, and the two ends of the adapter 13 are respectively connected to the second tab 1212 and the second electrode The leading part 11b is used to realize the electrical connection between the second tab 1212 and the second electrode leading part 11b.

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 (22)

1. A battery cell, characterized in that it comprises:

   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.
2. The battery cell according to claim 1, wherein the adapter is a rigid member configured to support the electrode assembly in a radial direction.
3. The battery cell according to claim 1 or 2, wherein the adapter is a hollow cylinder.
4. The battery cell according to any one of claims 1-3, wherein the battery cell further comprises a current collector, the current collector is attached to the second tab and is used to connect the The second tab and the adapter piece, so as to realize the electrical connection between the second tab and the adapter piece.
5. The battery cell according to claim 4, wherein the current collector is integrally formed with the adapter.
6. The battery cell according to any one of claims 1-5, wherein the casing assembly includes a wall portion, and the wall portion is the first electrode lead-out portion;

   The wall part is provided with an electrode lead-out hole, the second electrode lead-out part is insulated and installed in the electrode lead-out hole, and at least part of the second electrode lead-out part protrudes outside the wall part.
7. The battery cell according to claim 6, wherein the electrode assembly is a wound electrode assembly and includes a first pole piece, a second pole piece and an electrode for isolating the first pole piece and the second pole piece. As for the separator of the two-pole piece, the first pole piece is formed on the first pole piece, and the second pole piece is formed on the second pole piece.
8. The battery cell according to claim 7, wherein the first pole piece is wound to form a stacked structure, the stacked structure includes a first stacked area and a second stacked area, and the second stacked area surrounds On the outer side of the winding center hole, the first stacking area surrounds the outer side of the second stacking area, the first tab is only formed on the first stacking area, and is connected with the adapter There is a radial gap between them.
9. The battery cell according to claim 8, wherein the spacer forms a spacer in the gap for spaced apart from the first tab and the adapter, and the spacer faces the The end portion of the wall portion protrudes beyond the end portion of the second lamination region facing the wall portion along the axial direction.
10. The battery cell according to claim 7, wherein the first pole piece is wound to form a stacked structure, the stacked structure includes a first stacked area and a second stacked area, and the second stacked area surrounds On the outer side of the winding center hole, the first stacked area surrounds the outer side of the second stacked area, and the first tab includes a first sub-tab portion formed in the first stacked area and The second sub-tab portion formed in the second lamination region, the end portion of the first sub-tab portion facing the wall portion exceeds the end portion of the second sub-tab portion facing the wall portion along the axial direction end portion, and a gap is formed radially between the first sub-tab portion and the adapter piece.
11. The battery cell according to claim 10, wherein the spacer is formed with a spacer in the gap for spaced apart from the first tab and the adapter, and the spacer is located at the Between the second sub-tab portion and the adapter piece, the end portion of the spacer portion facing the wall portion exceeds the end portion of the second sub-tab portion facing the wall portion along the axial direction .
12. The battery cell according to claim 10, wherein the end of the spacer facing the wall exceeds the end of the first sub-tab facing the wall along the axial direction.
13. The battery cell according to any one of claims 7-12, wherein the innermost pole piece of the electrode assembly is the second pole piece.
14. The battery cell according to claim 6-13, wherein a groove is formed on the end surface of the second electrode lead-out part away from the electrode assembly, and the second electrode lead-out part is located in the groove The part between the adapter piece is welded with the adapter piece.
15. The battery cell according to claim 14, wherein the second electrode lead-out portion includes a first conductive layer and a second conductive layer stacked along the thickness direction of the wall portion, and the second conductive layer closer to the electrode assembly than the first conductive layer, and the second conductive layer is made of the same material as the adapter;

    The groove is recessed to the outer surface of the second conductive layer in a direction facing the electrode assembly, so that a partial area of the second conductive layer is exposed to the outside.
16. The battery cell according to claim 15, wherein the material of the first conductive layer is aluminum, and the material of the second conductive layer is copper.
17. The battery cell according to any one of claims 13-16, wherein the casing assembly includes a casing and an end cover, the casing includes a bottom wall and a side wall, and the side wall surrounds the Around the bottom wall, one end of the side wall is connected to the bottom wall, the other end of the side wall forms an opening opposite to the bottom wall, the end cover covers the opening, the The wall portion is the bottom wall or the end cap.
18. The battery cell according to any one of claims 1-17, wherein the battery cell is a cylindrical battery cell.
19. A battery, characterized by comprising the battery cell according to any one of claims 1-18.
20. An electric device, characterized by comprising the battery according to claim 19.
21. A method for preparing 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;

    A shell assembly is provided, the shell assembly includes a first electrode lead-out portion and a second electrode lead-out portion for inputting or outputting electrical energy, the shell assembly is used to accommodate the electrode assembly, the first electrode lead-out portion and the The second electrode lead-out parts are all arranged on the side of the shell component close to the first tab along the axial direction, and the first electrode lead-out parts are electrically connected to the first tab;

    Provide adapters;

    Put the adapter piece through the winding center hole, put the electrode assembly and the adapter piece inside the shell assembly, and connect the adapter piece to the second pole respectively The ear is connected to the second electrode lead-out part, so as to realize the electrical connection between the second pole ear and the second electrode lead-out part.
22. A preparation device for a battery cell, characterized in that it comprises:

    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 casing assembly is used to accommodate the electrode assembly, the first electrode lead-out part An electrode lead-out portion and the second electrode lead-out portion are both arranged on a side of the housing component that is close to the first tab along the axial direction, and the first electrode lead-out portion is connected to the first tab electrode. connect;

    The third providing device is used for providing the adapter;

    An assembly device for passing the adapter piece through the winding center hole, putting the electrode assembly and the adapter piece into the inside of the shell assembly, and connecting the adapter piece with the The second tab is connected to the second electrode lead-out portion, so as to realize the electrical connection between the second tab and the second electrode lead-out portion.

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