WO2023173249A1 - Battery cell, battery, electric device, and device and method for manufacturing battery cell - Google Patents

Abstract

The present application relates to the technical field of batteries, and provides a battery cell, a battery, an electric device, and a device and method for manufacturing a battery cell. The battery cell comprises a housing, an electrode assembly, an end cover, a terminal assembly, and a current collecting component. The electrode assembly is accommodated in the housing. The end cover is used for sealing an opening, and is provided with an electrode lead-out hole. An electrode terminal of the terminal assembly is provided corresponding to the electrode lead-out hole, and is used for outputting electric energy of the battery cell. The current collecting component is configured to electrically connect the electrode terminal to a tab. The current collecting component is provided with a connecting part located in the electrode lead-out hole; the connecting part is used for connecting to the electrode terminal; and in the radial direction of the electrode lead-out hole, a minimum distance H between the hole wall of the electrode lead-out hole and the peripheral wall of the connecting part satisfies H≥2mm. Therefore, there is a large creepage distance between the end cover and the current collecting component, so as to reduce the risk of high-voltage breakdown of the end cover, thereby reducing the risk of safety problems caused by high-voltage breakdown short circuit of a battery cell.

Description

Battery cells, batteries, electrical equipment, battery cell manufacturing equipment and methods Technical field

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

Background technique

With the application of lithium-ion batteries in power vehicles, the safety of batteries has attracted more and more attention. How to ensure that batteries do not cause safety accidents during the entire life cycle of the battery has become one of the common concerns in the lithium battery industry. .

Currently, there is a cantilever beam under the seal on the end cover of the battery cell. Since the cantilever beam is close to the current collecting component in the battery cell, the end cover may break down under high voltage, causing a short circuit and causing the battery cell to catch fire. .

Contents of the invention

Embodiments of the present application provide a battery cell, a battery, an electrical equipment, a battery cell manufacturing equipment and a method, so as to reduce the risk of the end cover being broken down by high voltage and improve the safety performance of the battery.

In a first aspect, embodiments of the present application provide a battery cell, including a case, an electrode assembly, an end cover, a terminal assembly and a current collecting member; the case has an opening; the electrode assembly is accommodated in the case, The electrode assembly has tabs; the end cover is used to cover the opening, and the end cover is provided with an electrode lead-out hole; the terminal assembly includes an electrode terminal, and the electrode terminal is arranged corresponding to the electrode lead-out hole , the electrode terminal is used to output the electric energy of the battery cell; the current collecting member is configured to be connected between the electrode terminal and the tab to realize the electrical connection between the electrode terminal and the tab. Connection; wherein the current collecting member has a connection portion located in the electrode lead-out hole, the connection portion is used to connect the electrode terminal, along the radial direction of the electrode lead-out hole, the hole of the electrode lead-out hole The minimum distance H between the wall and the peripheral wall of the connecting part satisfies H ≥ 2 mm.

In the above technical solution, the minimum distance in the radial direction between the hole wall of the electrode lead-out hole on the end cover and the connection part of the current collecting member extending into the electrode lead-out hole is not less than 2mm, then there will be a larger gap between the end cover and the current collecting member. The creepage distance reduces the risk of the end cover being broken down by high voltage, thereby reducing the risk of battery cells causing safety problems due to high voltage breakdown and short circuit.

In some embodiments of the first aspect, H satisfies: H≥3mm.

In the above technical solution, the minimum distance in the radial direction between the hole wall of the electrode lead-out hole on the end cover and the connection part of the current collecting member extending into the electrode lead-out hole is not less than 3mm, further increasing the gap between the end cover and the current collecting member. The creepage distance reduces the risk of the end cover being broken down by high voltage, thereby reducing the risk of battery cells causing safety problems due to high voltage breakdown and short circuit.

In some embodiments of the first aspect, H satisfies: H≤10mm.

In the above technical solution, the radial distance between the hole wall of the electrode lead-out hole on the end cover and the connection portion of the current collecting member extending into the electrode lead-out hole does not exceed 10 mm, which can reduce the manufacturing difficulty and ensure the structural strength of the end cover.

In some embodiments of the first aspect, along the axial direction of the electrode lead-out hole, the projection of the electrode terminal on the end cap is located in the electrode lead-out hole.

In the above technical solution, the projection of the electrode terminal on the end cap is located in the electrode lead-out hole, and the aperture of the electrode lead-out hole is larger than the outer diameter of the electrode terminal, so that the hole wall of the electrode lead-out hole and the electrode terminal along the radial direction of the electrode lead-out hole There should be a large distance between them so that there is a large creepage distance between the end cover and the current collecting component, which reduces the risk of the end cover being broken down by high voltage, thereby reducing the risk of battery cells being short-circuited due to high voltage breakdown. The risk of problems.

In some embodiments of the first aspect, the terminal assembly further includes a fixing member connected to the end cover, and the fixing member covers the electrode terminal along the circumferential direction of the electrode terminal. outside to fix the electrode terminal to the end cap.

In the above technical solution, a fixing member is provided to facilitate fixing the electrode terminal to the end cover. The fixing member circumferentially covers the outside of the electrode terminal, which can improve the stability of the installation of the electrode terminal.

In some embodiments of the first aspect, the fixing member and the end cap are integrally formed.

In the above technical solution, the fixing part and the end cover are integrally formed, which facilitates manufacturing; and the structure after the fixing part and the end cover are formed has strong structural strength.

In some embodiments of the first aspect of the present application, the terminal assembly further includes a first insulating member disposed between the fixing member and the electrode terminal to separate the fixing member and the electrode terminal. the electrode terminals.

In the above technical solution, the first insulating member is provided between the fixing member and the electrode terminal, which can prevent the battery cells from being short-circuited due to contact between the fixing member and the electrode terminal.

In some embodiments of the first aspect of the present application, the first insulating part is an injection molded part between the fixing part and the electrode terminal.

In the above technical solution, the first insulating part is an injection molded part. In other words, the first insulating part is formed between the fixing part and the electrode terminal by injection molding, which facilitates the molding and installation of the first insulating part. Injection molding can also improve the connection stability between the fixing part and the first insulating part and between the electrode terminal and the first insulating part.

In some embodiments of the first aspect of the present application, the inner peripheral surface of the fixing member is provided with a first limiting portion protruding inward, and the first insulating member is provided with a first limiting portion for insertion. The first recessed part is configured to be inserted into the first recessed part to fix the fixing part and the first insulating part.

In the above technical solution, the plug-fitting of the first limiting part and the first recessed part can improve the connection stability between the first insulating part and the fixing part.

In some embodiments of the first aspect of the present application, the inner peripheral surface of the fixing member is provided with a plurality of first limiting portions arranged at intervals, and the first insulating member is provided with a plurality of said first limiting portions arranged at intervals. The first recessed portion, the first limiting portion and the first recessed portion are arranged in one-to-one correspondence.

In the above technical solution, the plug-fitting of the plurality of first limiting portions and the plurality of first recessed portions can further improve the connection stability between the first insulating member and the fixing member. In addition, the plurality of first limiting parts and the plurality of first recessed parts can also circumferentially limit the first insulating part to prevent the first insulating part from rotating circumferentially relative to the fixing part.

In some embodiments of the first aspect of the present application, the outer peripheral surface of the fixing member is provided with a groove, and an inner peripheral surface of the fixing member is formed with a protruding groove at a position corresponding to the groove. The first limiting portion of the inner peripheral surface of the fixing member.

In the above technical solution, during the process of forming the groove on the outer peripheral surface of the fastener, the first limiting portion is formed on the inner surface of the fastener, which can reduce manufacturing difficulty and improve manufacturing efficiency.

In some embodiments of the first aspect of the present application, the electrode terminal includes a main body part, the first insulating member includes a connected first insulating part and a second insulating part, and the first insulating part is surrounded by the The outer periphery of the main body part has a first surface facing the inside of the battery cell, and the second insulating part is located on one side of the first surface and contacts the first surface to limit the The main body moves toward the inside of the battery cell.

In the above technical solution, the first insulating part is arranged around the outer periphery of the main body part, which can separate the fixing part and the main part, and prevent the fixing part and the main body part from contacting and causing internal short circuit of the battery cell. The second insulating part is in contact with the first surface of the main body part, which not only plays an insulating role, but also restricts the main body part from moving toward the inside of the battery cell, thereby improving the stability of the electrode terminal installation.

In some embodiments of the first aspect of the present application, the electrode terminal further includes a first protruding portion protruding from the first surface of the main body portion, and the first insulating member Surrounded by the outer periphery of the first protruding portion.

In the above technical solution, the electrode terminal further includes a first protruding part, which is closer to the inside of the battery cell than the main body part, so as to facilitate the connection between the electrode terminal and the current collecting member. The second insulating part surrounding the outer periphery of the first protruding part can increase the contact area between the first insulating member and the electrode terminal, thereby improving connection stability.

In some embodiments of the first aspect, along the radial direction of the electrode lead-out hole, the distance C between the hole wall of the electrode lead-out hole and the peripheral wall of the first protrusion satisfies: C≤8mm .

In the above technical solution, the distance C between the hole wall of the electrode lead-out hole and the outer peripheral wall of the first protruding part does not exceed 8 mm, which can not only increase the creepage distance between the end cover and the electrode terminal, but also reduce the height of the end cover. The risk of voltage breakdown, thereby reducing the risk of safety issues caused by battery cells due to high-voltage breakdown short circuit.

In some embodiments of the first aspect of the present application, the surface of the first protruding portion facing the battery cell is further away from the interior of the battery cell than the surface of the second insulating portion facing the battery cell; Wherein, along the axial direction of the electrode lead-out hole, the distance D between the surface of the first protruding part facing the battery cell and the surface of the second insulating part facing the battery cell satisfies: 0mm< D≤3mm.

In the above technical solution, the surface of the first protruding part facing the battery cell is further away from the inside of the battery cell than the surface of the second insulating part facing the battery cell, so that the second insulating part can better separate the fixing member and the third insulating part. A protruding part further reduces the risk of battery cell short circuit.

In some embodiments of the first aspect of the present application, the fixing member includes a fixing body surrounding the main body, and one end of the fixing body and the end cap are away from the inner surface of the battery cell. Connection; along the radial direction of the electrode lead-out hole, the distance E between the inner surface of the fixed body and the outer peripheral surface of the main body satisfies: 0.3mm≤E≤2mm.

In the above technical solution, the distance E between the inner surface of the fixed body and the outer peripheral surface of the main body satisfies: 0.3mm≤E≤2mm, which facilitates the installation of insulating parts between the fixed body and the main part, and the thickness of the insulating parts satisfies Insulation requirements.

In some embodiments of the first aspect of the present application, the inner diameter of the fixed body is smaller than the inner diameter of the electrode lead-out hole; along the radial direction of the electrode lead-out hole, the end of the fixed body connected to the end cap is The distance F between the inner surface and the hole wall of the electrode lead-out hole satisfies: 0.5≤F≤4mm.

In the above technical solution, the distance F between the inner surface of the end where the fixed body is connected to the end cover and the hole wall of the electrode lead-out hole satisfies: 0.5≤F≤4mm, which facilitates the fixed body to be fixedly formed on the end cover.

In some embodiments of the first aspect of the present application, the terminal assembly further includes a sealing member disposed between the fixing member and the electrode terminal to sealingly connect the electrode terminal and the fixing member. .

In the above technical solution, a sealing member is provided between the fixing member and the electrode terminal, which can improve the sealing performance between the fixing member and the electrode terminal, thereby improving the sealing performance of the battery cell.

In some embodiments of the first aspect of the present application, the electrode terminal includes a main body; the fixing member includes a flange, the flange is configured to extend in a direction close to an axis of the electrode lead-out hole and is located at the The side of the main body that is away from the inside of the battery cell is to restrict the movement of the electrode terminal in a direction away from the inside of the battery cell, and at least part of the sealing member is located between the flange and the main body. between.

In the above technical solution, the flange can restrict the movement of the electrode terminal in a direction away from the interior of the battery cell, thereby improving the stability of the installation of the electrode terminal.

In some embodiments of the first aspect of the present application, a side of the main body portion facing away from the interior of the battery cell has a second surface, and the electrode terminal further includes a boss, and the boss is formed from the second surface. A surface protrudes from the main body, a portion of the seal is located between the second surface and the flange, and a portion of the seal is located between the flange and the outer peripheral surface of the boss. .

In the above technical solution, part of the seal is located between the second surface and the boss, and part of the seal is located between the inner peripheral surface of the flange and the outer peripheral surface of the boss, which can increase the contact area between the seal and the electrode terminal. As well as increasing the contact area between the seal and the flange, improving the sealing performance between the fixture and the electrode terminal.

In some embodiments of the first aspect of the present application, the battery cell further includes a second insulating member, the second insulating member includes a connected insulating body part and an extension part, the insulating body part is disposed on the end The side of the cover facing the inside of the battery cell, along the axial direction of the electrode lead-out hole, the extension portion extends from the insulating body portion in a direction close to the electrode terminal into the electrode lead-out hole and A hole wall surrounding the outside of the connecting portion to separate the connecting portion from the electrode lead-out hole.

In the above technical solution, the insulating body part of the second insulating member is disposed on the side of the end cover facing the inside of the battery cell, which can separate the electrode assembly and the end cover and prevent the electrode assembly and the end cover from contacting the battery cell and causing a short circuit. The extension part of the second insulating member extends into the electrode lead-out hole and is located outside the connection part of the current collecting member, which can separate the connection part and the hole wall of the electrode lead-out hole, and reduce the risk of short circuit of the battery cells caused by contact between the connection part and the end cover. .

In a second aspect, embodiments of the present application provide a battery, including the battery cell provided in the embodiment of the first aspect.

In the above technical solution, the battery cell in the embodiment of the first aspect has a large creepage distance between the end cover and the current collecting member, which reduces the risk of the end cover being broken down by high voltage, thereby reducing the risk of the battery cell being damaged due to high voltage. The risk of safety issues caused by breakdown short circuit, thereby improving the safety performance of the battery.

In a third aspect, an embodiment of the present application provides an electrical device, including the battery cell provided in the embodiment of the first aspect.

In the above technical solution, the battery cell in the embodiment of the first aspect has a large creepage distance between the end cover and the current collecting member, which reduces the risk of the end cover being broken down by high voltage, thereby reducing the risk of the battery cell being damaged due to high voltage. Reduce the risk of safety issues caused by breakdown short circuit, thereby improving electrical safety.

In a fourth aspect, embodiments of the present application provide a battery cell manufacturing equipment, including a providing device and an assembling device; the providing device is configured to provide a case, an electrode assembly, an end cap, a terminal assembly and a current collecting member, so The housing has an opening, the electrode assembly has tabs, and the end cover is provided with an electrode lead-out hole; the terminal assembly includes an electrode terminal, and the electrode terminal is arranged corresponding to the electrode lead-out hole, and the electrode terminal is In order to output the electric energy of the battery cell; the assembly device is configured to accommodate the electrode assembly in the housing, connect the current collecting member between the electrode terminal and the tab, so as to The electrode terminal and the tab are electrically connected; wherein, the current collection member has a connection portion located in the electrode lead-out hole, and the connection portion is used to connect the electrode terminal, along the electrode lead-out hole In the radial direction, the minimum distance H between the hole wall of the electrode lead-out hole and the outer peripheral wall of the connecting part satisfies H ≥ 2 mm.

In a fifth aspect, embodiments of the present application provide a method for manufacturing a battery cell, including:

A housing, an electrode assembly, an end cover, a terminal assembly and a current collecting member are provided, the housing has an opening, the electrode assembly has a pole lug, the end cover is provided with an electrode lead-out hole; the terminal assembly includes an electrode terminal, The electrode terminal is arranged corresponding to the electrode lead-out hole, and the electrode terminal is used to output the electric energy of the battery cell;

accommodating the electrode assembly in the housing;

Connect the current collecting member between the electrode terminal and the tab to achieve electrical connection between the electrode terminal and the tab;

Wherein, the current collecting member has a connection part located in the electrode lead-out hole, the connection part is used to connect the electrode terminal, along the radial direction of the electrode lead-out hole, the hole wall of the electrode lead-out hole and The minimum distance H between the peripheral walls of the connecting portion satisfies H ≥ 2 mm.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used 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 therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

Figure 2 is a schematic structural diagram of a battery provided by some embodiments of the present application;

Figure 3 is an exploded view of a battery cell provided by some embodiments of the present application;

Figure 4 is a cross-sectional view of a battery cell provided by some embodiments of the present application;

Figure 5 is an enlarged view of position I in Figure 4;

Figure 6 is an exploded view of a partial structure of a battery cell provided by some embodiments of the present application;

Figure 7 is a top view of a battery cell provided by some embodiments of the present application;

Figure 8 is a cross-sectional view along the A-A direction in Figure 7;

Figure 9 is a schematic structural diagram of battery cell manufacturing equipment provided by some embodiments of the present application;

Figure 10 is a flow chart of a method for manufacturing a battery cell according to some embodiments of the present application.

Icon: 1000-vehicle; 100-battery; 10-box; 11-installation space; 12-first part; 13-second part; 20-battery cell; 21-casing; 211-opening; 22-electrode assembly ; 221-pole tab; 221a-positive pole tab; 221b-negative pole tab; 23-end cover; 231-liquid injection hole; 232-electrode lead-out hole; 2321-hole wall of electrode lead-out hole; 24-terminal assembly; 241 -Electrode terminal; 2411-main body; 2411a-first surface; 2411b-second surface; 2412-first protruding portion; 2413-convex platform; 2414-second recessed portion; 25-current collecting member; 251-connection 26-pressure relief mechanism; 27-fixing piece; 271-first limiting part; 272-groove; 273-flange; 274-fixed body; 28-first insulating piece; 281-first insulating part; 300 -Motor; 2000-Battery cell manufacturing equipment; 2100-Providing device; 2200-Assembling device.

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 and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is commonly placed when used, or the orientation or positional relationship of this application. The orientation or positional relationship commonly understood by those skilled in the art is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.

The battery cell includes a case, an electrode assembly, an end cap, a terminal assembly and a current collecting member. The housing has an opening. The electrode assembly is contained in the housing. The end cap is used to cover the opening of the housing. The end cover is provided with an electrode lead-out hole, and the terminal assembly includes an electrode terminal, and the electrode terminal is used to output the electric energy of the battery cell. The electrode terminal is arranged corresponding to the electrode lead-out hole, and the connecting portion of the current collecting member extends into the electrode lead-out hole and is connected to the electrode terminal, so that the electrode terminal and the tab of the electrode assembly are electrically connected through the current collecting member.

The inventor found that along the radial direction of the electrode lead-out hole, the distance between the hole wall of the electrode lead-out hole of the end cap and the connection part of the current collecting member located in the electrode lead-out hole is relatively close, so that there is a relatively small gap between the end cover and the current collecting member. Small creepage distance (the creepage distance is the shortest path between two conductive parts or between the conductive parts and the equipment protection interface measured along the insulating surface, here refers to the hole wall of the electrode lead-out hole of the end cover in the radial direction and the connection part of the current collecting member), causing the end cover to be easily broken down under high voltage, resulting in a short circuit of the battery cells.

Based on the above considerations, in order to reduce the risk of the battery cell being short-circuited due to high-voltage breakdown of the end cover, the inventor has conducted in-depth research and designed a battery cell in which the hole wall of the electrode lead-out hole and the outer peripheral wall of the connecting part are aligned along the electrode The minimum distance H in the radial direction of the lead-out hole satisfies: H ≥ 2mm, so that there is a large creepage distance between the end cover and the current collecting component, reducing the risk of the end cover being broken down by high voltage, thereby reducing the risk of battery cell failure. High voltage breakdown short circuit.

The battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, vehicles, ships, aircraft, and other electrical equipment. The power supply system of the electrical equipment can be composed of the battery cells and batteries disclosed in this application. In this way, it is helpful to reduce the risk of short circuit of the battery cells due to high-voltage breakdown of the end caps of the battery cells, and improve the stability of the battery performance. performance and battery safety.

The technical solutions described in the embodiments of this application are applicable to batteries and electrical equipment using batteries.

Power-consuming 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, etc.; spacecraft include aircraft, rockets, space shuttles, spaceships, etc.; electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship 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, planers and more. The embodiments of this application impose no special restrictions on the above electrical equipment.

In the following embodiments, for convenience of explanation, the electric equipment is the vehicle 1000 as an example.

Referring to FIG. 1 , a battery 100 is disposed inside a vehicle 1000 . The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 .

The vehicle 1000 may also include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .

In some embodiments 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 or natural gas to provide driving power for the vehicle 1000 .

Referring to FIG. 2 , the battery 100 includes a case 10 and a battery cell 20 . The battery cell 20 is contained in the case 10 .

The box 10 is used to provide an installation space 11 for the battery cells 20 . In some embodiments, the box 10 may include a first part 12 and a second part 13 , the first part 12 and the second part 13 covering each other to define an installation space 11 for accommodating the battery cells 20 . Of course, the connection between the first part 12 and the second part 13 can be sealed by a sealing member 29 (not shown), and the sealing member 29 can be a sealing ring, sealant, etc.

The first part 12 and the second part 13 can be in various shapes, such as cuboid, cylinder, etc. The first part 12 may be a hollow structure open on one side to form a receiving cavity for accommodating the battery cells 20 , and the second part 13 may also be a hollow structure open on one side to form a receiving cavity for accommodating the battery cells 20 . The second part 13 The open side of the first part 12 is covered with the open side of the first part 12 to form a box 10 having an installation space 11 . Of course, it is also possible that the first part 12 has a hollow structure with one side open to form a receiving cavity for accommodating the battery cells 20, the second part 13 has a plate-like structure, and the second part 13 covers the open side of the first part 12, then A box 10 having an installation space 11 is formed.

In the battery 100, there may be one battery cell 20 or a plurality of battery cells 20. If there are multiple battery cells 20 , the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or mixed together, and then the whole composed of the plurality of battery cells 20 can be accommodated in the box 10 ; of course, the plurality of battery cells 20 can also be connected in series first. They may be connected in parallel or mixed to form a battery module, and multiple battery modules may be connected in series, parallel or mixed to form a whole, and be accommodated in the box 10 . The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes. FIG. 2 exemplarily shows the case where the battery cell 20 is in the shape of a rectangular parallelepiped.

In some embodiments, the battery 100 may further include a bus component (not shown), through which the multiple battery cells 20 may be electrically connected to achieve series, parallel, or mixed connection of the multiple battery cells 20 . Union.

Referring to FIG. 3 , the battery cell 20 may include a case 21 , an electrode assembly 22 , an end cover 23 , a terminal assembly 24 and a current collecting member 25 . The housing 21 has an opening 211 , the electrode assembly 22 is accommodated in the housing 21 , and the end cap 23 is used to cover the opening 211 .

The housing 21 can be in various shapes, such as cylinder, rectangular parallelepiped, etc. The shape of the housing 21 can be determined according to the specific shape of the electrode assembly 22 . For example, if the electrode assembly 22 has a cylindrical structure, the housing 21 can have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the housing 21 can have a rectangular parallelepiped structure. FIG. 3 exemplarily shows the case where the housing 21 and the electrode assembly 22 are rectangular parallelepipeds.

The housing 21 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., which are not particularly limited in the embodiment of the present application.

The electrode assembly 22 may include a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separation film (not shown). The electrode assembly 22 may be a rolled structure formed by winding a positive electrode sheet, a separator film, and a negative electrode sheet, or may be a stacked structure formed by a stacked arrangement of positive electrode sheets, a separator film, and a negative electrode sheet. The electrode assembly 22 also includes a positive electrode tab 221a and a negative electrode tab 221b, which may be a positive electrode current collector in the positive electrode sheet that is not coated with a positive electrode active material layer. The positive electrode tab 221a may be a negative electrode sheet that is not coated with a negative electrode active material layer. The negative electrode current collector serves as the negative electrode tab 221b.

The end cap 23 is used to cover the opening 211 of the housing 21 to form a sealed accommodation space (not shown), and the accommodation space is used to accommodate the electrode assembly 22 . The accommodation space is also used to accommodate electrolytes, such as electrolytes.

The terminal assembly 24 is a component that outputs electric energy from the battery cell 20 , and includes an electrode terminal 241 .

The electrode terminal 241 is used to electrically connect with the electrode assembly 22 , that is, the electrode terminal 241 is electrically connected to the tab 221 of the electrode assembly 22 , and the electrode terminal 241 and the tab 221 are connected through the current collecting member 25 to realize the electrode terminal 241 and the tab 221 . electrical connection.

It should be noted that the opening 211 of the housing 21 may be one or two. If the opening 211 of the housing 21 is one, the end cover 23 can also be one, and two electrode terminals 241 can be provided in the end cover 23. The two electrode terminals 241 are respectively used to connect the positive electrode tab 221a and the negative electrode of the electrode assembly 22. The ear 221b is electrically connected, and the two electrode terminals 241 on the end cap 23 are respectively the positive electrode terminal 241 and the negative electrode terminal 241. If there are two openings 211 of the housing 21, for example, the two openings 211 are provided on opposite sides of the housing 21, the number of end caps 23 can also be two, and the two end caps 23 cover the two sides of the housing 21 respectively. There are 211 openings. In this case, the two electrode terminals 241 of the terminal assembly 24 can be respectively provided on the two end caps 23 , and the electrode terminal 241 on one end cap 23 can be a positive electrode terminal 241 for connecting with the positive electrode of the electrode assembly 22 The tab 221a is electrically connected; the electrode terminal 241 on the other end cover 23 is the negative electrode terminal 241, which is used for electrical connection with the negative electrode piece of the electrode assembly 22.

In some embodiments, as shown in FIG. 3 , the end cover 23 may also be provided with a liquid injection hole 231 through which the electrolyte can be injected into the housing 21 .

In some embodiments, as shown in FIG. 3 , a pressure relief mechanism 26 may also be provided on the end cover 23 . The pressure relief mechanism 26 is used to be activated to discharge the battery when the internal pressure or temperature of the battery cell 20 reaches a threshold. The internal pressure of the cell 20. This threshold design varies based on design requirements. The threshold value may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell 20 . The pressure relief mechanism 26 may be in the form of an explosion-proof valve, an explosion-proof disc, an air valve, a pressure relief valve or a safety valve, and may specifically adopt a pressure-sensitive or temperature-sensitive component or structure. That is, when the internal pressure of the battery cell 20 Or when the temperature reaches a predetermined threshold, the pressure relief mechanism 26 takes action or the weak structure provided in the pressure relief mechanism 26 is destroyed, thereby forming an opening 211 or a channel for the internal pressure or temperature to be released.

The “activation” mentioned in this application means that the pressure relief mechanism 26 acts or is activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The actions generated by the pressure relief mechanism 26 may include, but are not limited to: at least a portion of the pressure relief mechanism 26 ruptures, shatters, is torn or opens, and the like.

In some embodiments, as shown in Figures 3, 4, and 5, the battery cell 20 includes a housing 21, an electrode assembly 22, an end cover 23, a terminal assembly 24, and a current collecting member 25; the housing 21 has an opening 211 ; The electrode assembly 22 is accommodated in the housing 21, and the electrode assembly 22 has tabs 221; the end cover 23 is used to cover the opening 211, and the end cover 23 is provided with an electrode lead-out hole 232; the terminal assembly 24 includes an electrode terminal 241, and the electrode terminal 241 Set corresponding to the electrode lead-out hole 232, the electrode terminal 241 is used to output the electric energy of the battery cell 20; the current collecting member 25 is configured to be connected between the electrode terminal 241 and the tab 221 to realize the electrical connection between the electrode terminal 241 and the tab 221. Connection; wherein, the current collecting member 25 has a connecting portion 251 located in the electrode lead-out hole 232. The connecting portion 251 is used to connect the electrode terminal 241. Along the radial direction of the electrode lead-out hole 232, the hole wall 2321 of the electrode lead-out hole and the connecting portion 251 The minimum distance H between the peripheral walls satisfies H ≥ 2mm.

The electrode lead-out hole 232 may be a round hole, a square hole, a rectangular hole or other special-shaped holes. In this embodiment, the electrode lead-out hole 232 is a circular hole, and the electrode lead-out hole 232 penetrates the end cover 23 and is located on both sides in the thickness direction. The axial direction of the electrode lead-out hole 232 is consistent with the thickness direction of the end cap 23 .

The connecting portion 251 of the current collecting member 25 extends into the electrode lead-out hole 232 along the axial direction of the electrode lead-out hole 232 . The outer peripheral surface of the connecting portion 251 may be a cylindrical surface or a conical surface. H refers to the minimum distance in the radial direction between the hole wall 2321 of the electrode lead hole 232 and the outer peripheral wall of the connection part 251 of the electrode lead hole 232 of any shape and the connection part 251 of any shape.

The minimum distance in the radial direction between the hole wall 2321 of the electrode lead-out hole on the end cover 23 and the connection portion 251 of the current collection member 25 extending into the electrode lead-out hole 232 is not less than 2 mm, then there is a gap between the end cover 23 and the current collection member 25 The larger creepage distance reduces the risk of the end cover 23 being broken down by high voltage, thereby reducing the risk of the battery cell 20 causing safety problems due to high voltage breakdown and short circuit.

Depending on the actual situation, the minimum distance H between the hole wall 2321 of the electrode lead-out hole and the peripheral wall of the connecting portion 251 may have different value ranges. For example, in some embodiments, H satisfies: H≥3 mm.

In other embodiments, the lower limit of the value range of H can also be other values, such as H≥2.5mm, H≥3.5mm, H≥4mm, and so on.

The minimum distance in the radial direction between the hole wall 2321 of the electrode lead-out hole on the end cover 23 and the connection portion 251 of the current collecting member 25 extending into the electrode lead-out hole 232 is not less than 3 mm, further increasing the distance between the end cover 23 and the current collecting member 25. The creepage distance between the end caps 23 is reduced by high voltage, thereby reducing the risk of safety problems caused by high voltage breakdown and short circuit of the battery cells 20 .

The greater the distance between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the connecting portion 251, the greater the difficulty of the process. Considering the size that can be achieved by the processing technology and the actual structural size of the end cover 23, in some embodiments , H satisfies: H≤10mm.

Of course, in other embodiments, the upper limit of H can also be other values. For example, H≤9mm, H≤9.5mm, H≤11mm, etc.

The radial distance between the hole wall 2321 of the electrode lead-out hole on the end cover 23 and the connection portion 251 of the current collecting member 25 extending into the electrode lead-out hole 232 does not exceed 10 mm, which can reduce the manufacturing difficulty and ensure the structural strength of the end cover 23 .

Referring to FIG. 5 , in some embodiments, along the axial direction of the electrode lead-out hole 232 , the projection of the electrode terminal 241 on the end cap 23 is located within the electrode lead-out hole 232 .

The electrode lead-out hole 232 and the electrode terminal 241 are coaxially arranged. If the projection of the electrode terminal 241 on the end cover 23 is located in the electrode lead-out hole 232, the diameter of the electrode lead-out hole 232 is larger than the outer diameter of the projection of the electrode terminal 241 on the end cover 23 along its axial direction. In other embodiments, the aperture of the electrode lead-out hole 232 may be smaller than or equal to the outer diameter of the projection of the electrode terminal 241 on the end cap 23 along its axial direction.

The projection of the electrode terminal 241 on the end cover 23 is located in the electrode lead hole 232, then the aperture of the electrode lead hole 232 is larger than the outer diameter of the electrode terminal 241, so that the hole wall 2321 of the electrode lead hole 2321 and the radial direction of the electrode lead hole 232 are There is a large distance between the electrode terminals 241, so that there is a large creepage distance between the end cover 23 and the current collecting member 25, reducing the risk of the end cover 23 being broken down by high voltage, thereby reducing the risk of the battery cell 20 Risk of safety issues caused by high voltage breakdown and short circuit.

The electrode terminal 241 can be directly fixed on the end cover 23 or can be fixed on the end cover 23 through indirect connection. Please refer to FIGS. 5 and 6 . In some embodiments, the terminal assembly 24 further includes a fixing member 27 connected to the end cover 23 . The fixing member 27 covers the outside of the electrode terminal 241 along the circumferential direction of the electrode terminal 241 . , to fix the electrode terminal 241 to the end cover 23 .

One end of the fixing member 27 is fixed to the end cover 23 . The other end of the fixing member 27 is located on the side of the end cover 23 facing away from the interior of the battery cell 20 . In other words, the fixing member 27 extends from the end cover 23 to the side of the end cover 23 facing away from the interior of the battery cell 20 and protrudes. The end cap 23 is a surface facing away from the interior of the battery cell 20 . The fixing member 27 is a closed structure extending along the circumferential direction of the electrode lead-out hole 232 . One end of the fixing part 27 connected to the end cover 23 extends along the extending direction of the hole wall from which the electrode is led out to form the fixing part 27 with a closed structure. It can be understood that the electrode terminal 241 is indirectly fixed to the end cover 23 through the fixing member 27 .

Along the axial direction of the electrode lead-out hole 232, the electrode terminals 241 can be completely located in the space surrounded by the fixing member 27 and located on the side of the end cover 23 away from the inside of the battery cell 20; the electrode terminal 241 can also be partially located around the fixing member 27. In the space formed, part of the electrode terminal 241 extends into the electrode lead-out hole 232 and is connected to the connection portion 251 of the current collecting member 25 .

The fixing member 27 is provided to facilitate fixing the electrode terminal 241 to the end cover 23 . The fixing member 27 circumferentially covers the outside of the electrode terminal 241, which can improve the stability of the installation of the electrode terminal 241. And the fixing piece 27 extends to the side of the end cover 23 away from the inside of the battery cell 20. At least part of the fixing piece 27 can be located in the space enclosed by the fixing piece 27, which can reduce the impact of the electrode terminal 241 on the internal space of the battery cell 20. Occupation is conducive to improving energy density.

In some embodiments, the fixing member 27 is integrally formed with the end cap 23 .

The fixing piece 27 and the end cover 23 are integrally formed, which means that the fixing piece 27 and the end cover 23 are made by an integral forming process, such as stamping, pouring and other integral forming processes.

In other embodiments, the fixing member 27 and the end cover 23 may also be provided separately, and then the fixing member 27 and the end cover 23 may be connected as a whole by welding or other methods.

The fixing part 27 and the end cap 23 are integrally formed, which facilitates manufacturing; and the structure after the fixing part 27 and the end cap 23 are formed has strong structural strength.

Please refer to FIGS. 5 and 6 . In some embodiments, the terminal assembly 24 further includes a first insulating member 28 . The first insulating member 28 is disposed between the fixing member 27 and the electrode terminal 241 to separate the fixing member 27 and the electrode terminal. 241.

The first insulating member 28 is a closed structure extending along the axial direction of the electrode lead-out hole 232 . The first insulating member 28 may be squeezed between the fixing member 27 and the electrode terminal 241. The first insulating member 28 may also form a connection relationship with both the fixing member 27 and the electrode terminal 241, so that the electrode terminal 241 passes through the first The insulating component 28 is indirectly connected to the fixing component 27 .

The first insulating member 28 separates the fixing member 27 and the electrode terminal 241 , which means that the first insulating member 28 prevents the fixing member 27 from contacting the electrode terminal 241 , thereby making the fixing member 27 and the electrode terminal 241 non-conductive. Providing the first insulating member 28 between the fixing member 27 and the electrode terminal 241 can prevent the fixing member 27 from contacting the electrode terminal 241 and causing a short circuit in the battery cell 20 .

In some embodiments, the first insulating component 28 is an injection molded component between the fixing component 27 and the electrode terminal 241 .

During the injection molding process, the liquid first insulating member 28 has a high temperature. After contacting the fixing member 27 and the electrode terminal 241, the inner surface of the fixing member 27 and the outer surface of the electrode terminal 241 can be in a molten state. Then the fixing member 27 The molecules of the liquid first insulating member 28 will penetrate each other, and the molecules of the electrode terminal 241 and the liquid first insulating member 28 will penetrate each other. After the first insulating member 28 solidifies into a solid state, the first insulation The member 28 and the fixing member 27, the first insulating member 28 and the electrode terminal 241 all form a connection relationship.

In other embodiments, the first insulating member 28 may be formed and then placed between the fixing member 27 and the electrode terminal 241 .

The first insulating part 28 is an injection molded part. In other words, the first insulating part 28 is formed between the fixing part 27 and the electrode terminal 241 by injection molding, which facilitates the molding and installation of the first insulating part 28 . Injection molding can also improve the connection stability between the fixing part 27 and the first insulating part 28 and the electrode terminal 241 and the first insulating part 28 .

In order to improve the connection stability between the first insulating member 28 and the fixing member 27, please continue to refer to Figures 5 and 6. In some embodiments, the inner peripheral surface of the fixing member 27 is provided with an inwardly protruding first limiting portion. 271. The first insulating member 28 is provided with a first recessed portion 283 for the first limiting portion 271 to be inserted. The first limiting portion 271 is configured to be inserted into the first recessed portion 283 to fix the fixing member 27 and the first recessed portion 283. Insulator 28.

The first limiting part 271 may be a closed structure extending along the circumferential direction of the electrode lead-out hole 232. Correspondingly, the first recessed part 283 may also be a closed structure extending along the circumferential direction of the electrode lead-out hole 232 matching the first limiting part 271. A closed structure formed by extending; the first limiting part 271 may also form a non-closed structure along the circumferential direction of the electrode lead-out hole 232. In this embodiment, the first recessed part 283 may be a non-closed structure matching the first limiting part 271. The closed structure may also be a closed structure extending along the circumferential direction of the electrode lead-out hole 232 .

In other embodiments, the first recess 283 may also be provided on the inner surface of the fixing member 27 , and the surface of the first insulating member 28 facing the inner surface of the fixing member 27 is formed with an inner surface that can be inserted into the fixing member 27 . The first limiting portion 271 of the first recessed portion 283.

The plug-fitting of the first limiting part 271 and the first recessed part 283 can improve the connection stability between the first insulating part 28 and the fixing part 27 .

The number of the first limiting part 271 may be one or multiple, wherein multiple refers to two or more. As shown in FIG. 6 , in some embodiments, the inner peripheral surface of the fixing member 27 is provided with a plurality of first limiting portions 271 arranged at intervals, and the first insulating member 28 is provided with a plurality of first recessed portions 283 arranged at intervals. , the first limiting portion 271 and the first recessed portion 283 are provided in one-to-one correspondence.

The plurality of first limiting portions 271 can be arranged co-circularly or distributed on different circumferences. The plurality of first limiting portions 271 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232 .

In other embodiments, the plurality of first limiting portions 271 may also be arranged at intervals along the axial direction of the electrode lead-out hole 232 .

The plug-fitting of the plurality of first limiting portions 271 and the plurality of first recessed portions 283 can further improve the connection stability between the first insulating member 28 and the fixing member 27. In addition, the plurality of first limiting portions 271 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232, so that the plurality of first limiting portions 271 and the plurality of first recessed portions 283 can also circumferentially limit the first insulating member 28 after cooperation. position to prevent the first insulating member 28 from rotating circumferentially relative to the fixing member 27 .

As shown in FIG. 6 , in some embodiments, the outer circumferential surface of the fixing member 27 is provided with a groove 272 , and an inner circumferential surface of the fixing member 27 is formed with a groove protruding from the fixing member 27 at a position corresponding to the groove 272 . The first limiting portion 271 on the inner peripheral surface.

The groove 272 is recessed from the outer circumferential surface of the fixing part 27 into the internal space enclosed by the fixing part 27, and the inner surface of the fixing part 27 protrudes into the internal space enclosed by the fixing part 27 at the corresponding position of the groove 272. To form the first limiting portion 271.

In other embodiments, the first limiting portion 271 can also be directly provided on the inner surface of the fixing member 27 .

During the process of forming the groove 272 on the outer peripheral surface of the fixing part 27, the first limiting part 271 is formed on the inner surface of the fixing part 27, which can reduce manufacturing difficulty and improve manufacturing efficiency.

In order to improve the connection stability between the first insulating member 28 and the electrode terminal 241, please continue to refer to FIG. 6. In some embodiments, along the radial direction of the electrode lead-out hole 232, the surface of the first insulating member 28 facing the electrode terminal 241 is provided with The second limiting part 284 is provided with a second recessed part 2414 for the second limiting part 284 to be inserted on the surface of the electrode terminal 241 facing the first insulating member 28. The second limiting part 284 is configured to be inserted into the second recessed part. 2414 to fix the first insulating member 28 and the electrode terminal 241.

The second limiting part 284 may be a closed structure extending along the circumferential direction of the electrode lead-out hole 232. Correspondingly, the second recessed part 2414 may also be a closed structure extending along the circumferential direction of the electrode lead-out hole 232 to match the second limiting part 284. Extended and formed closed structure; the second limiting part 284 may also form a non-closed structure along the circumferential direction of the electrode lead hole 232. In this embodiment, the second recessed part 2414 may be a non-closed structure matching the second limiting part 284. The closed structure may also be a closed structure extending along the circumferential direction of the electrode lead-out hole 232 .

In other embodiments, the second recessed portion 2414 may be provided on the surface of the first insulating member 28 facing the electrode terminal 241 , and the surface of the electrode terminal 241 facing the first insulating member 28 may be formed with a surface capable of inserting the first insulating member. 28 and the second limiting portion 284 of the second recessed portion 2414.

The plug-fitting of the second limiting portion 284 and the second recessed portion 2414 can improve the connection stability between the first insulating member 28 and the electrode terminal 241 .

The number of the second limiting part 284 may be one or multiple, wherein multiple refers to two or more. In some embodiments, the first insulating member 28 is provided with a plurality of second limiting portions 284 arranged at intervals, and the electrode terminal 241 is provided with a plurality of second recessed portions 2414 arranged at intervals. The second limiting portions 284 are connected to the second limiting portions 284 . The recessed portions 2414 are provided in one-to-one correspondence.

The plurality of second limiting portions 284 can be arranged co-circularly or distributed on different circumferences. The plurality of second limiting portions 284 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232 .

In other embodiments, the plurality of second limiting portions 284 may also be arranged at intervals along the axial direction of the electrode lead-out hole 232 .

The plug-fitting of the plurality of second limiting portions 284 and the plurality of second recessed portions 2414 can further improve the connection stability between the first insulating member 28 and the electrode terminal 241 . In addition, the plurality of second limiting portions 284 are arranged at intervals along the circumferential direction of the electrode lead-out hole 232, so that the plurality of second limiting portions 284 and the plurality of second recessed portions 2414 can also circumferentially limit the first insulating member 28. position to prevent the electrode terminal 241 from rotating circumferentially relative to the first insulating member 28 .

Please refer to FIGS. 5 and 6 in conjunction. In some embodiments, the electrode terminal 241 includes a main body part 2411. The first insulating member 28 includes a connected first insulating part 281 and a second insulating part 282. The first insulating part 281 surrounds On the outer periphery of the main body part 2411, the main body part 2411 has a first surface 2411a facing the inside of the battery cell 20. The second insulating part 282 is located on one side of the first surface 2411a and contacts the first surface 2411a to limit the direction of the main body part 2411. Move toward the inside of the battery cell 20 .

Both the first insulating part 281 and the second insulating part 282 are closed structures extending along the circumferential direction of the electrode lead-out hole 232 . The first insulating portion 281 is provided around the outer periphery of the main body portion 2411 to separate the main body portion 2411 and the fixing member 27 . The second insulating part 282 is connected to one end of the first insulating part 281 along the axial direction of the electrode lead hole 232 . The second insulating part 282 has an annular structure, so that the second insulating part 282 is formed with a central hole, and the connecting part 251 of the current collecting member 25 can extend into the central hole to connect with the electrode terminal 241 or the electrode terminal 241 can pass through the central hole and connect with the electrode terminal 241 . The connection portion 251 of the current collecting member 25 is connected.

The second recessed portion 2414 is disposed on the outer peripheral surface of the main body 2411 and penetrates both ends of the main body 2411 along the axial direction of the electrode lead-out hole 232 .

In other embodiments, the first insulation member 28 may only include the first insulation portion 281 .

The first insulating part 281 is surrounding the outer periphery of the main body part 2411 and can separate the fixing part 27 and the main part 2411 to prevent the fixing part 27 and the main part 2411 from contacting and causing an internal short circuit in the battery cell 20 . The second insulating part 282 is in contact with the first surface 2411a of the main body part 2411, which not only plays an insulating role, but also restricts the movement of the main body part 2411 toward the inside of the battery cell 20, thereby improving the installation stability of the electrode terminal 241.

Please continue to refer to FIG. 5 and FIG. 6 . In some embodiments, the electrode terminal 241 further includes a first protruding part 2412 . The first protruding part 2412 protrudes from the first surface 2411 a of the main body part 2411 . The first insulating member 28 surrounds the body part 2411 . Provided on the outer periphery of the first protruding portion 2412.

The main body part 2411 and the first protrusion part 2412 are both cylindrical, and the diameter of the main body part 2411 is larger than the diameter of the first protrusion. The surface of the second insulating portion 282 facing away from the interior of the battery cell 20 is connected to the first surface 2411 a of the main body portion 2411 . Along the radial direction of the electrode lead-out hole 232 , the inner surface of the second insulating part 282 is in contact with the outer peripheral surface of the first protruding part 2412 . The surface of the second insulating part 282 facing the inside of the battery cell 20 and the surface of the first protruding part 2412 facing the inside of the battery cell 20 may or may not be flush. In some embodiments, the surface of the second insulating portion 282 facing the interior of the battery cell 20 is closer to the interior of the battery cell 20 or the second insulating portion 282 than the surface of the first protruding portion 2412 facing the interior of the battery cell 20 . The surface facing the interior of the battery cell 20 is further away from the interior of the battery cell 20 than the surface of the first protrusion 2412 facing the interior of the battery cell 20 , so that the two are not flush.

The electrode terminal 241 includes a first protruding portion 2412 , which is closer to the inside of the battery cell 20 than the main body portion 2411 to facilitate the connection between the electrode terminal 241 and the current collecting member 25 . The second insulating portion 282 surrounding the outer periphery of the first protruding portion 2412 can increase the contact area between the first insulating member 28 and the electrode terminal 241 and improve connection stability.

As shown in Figures 5, 7, and 8, in some embodiments, along the radial direction of the electrode lead-out hole 232, the distance C between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the first protrusion 2412 satisfies: C≤8mm.

It should be noted that in some embodiments, the connection position between the fixing member 27 and the end cover 23 has a corner area, and the distance C between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the first protrusion 2412 should be subtracted from The corner area has a size along the radial direction of the electrode assembly 22 (as shown in F in FIG. 8 ), but the size of the corner area in the radial direction of the electrode lead-out hole 232 is very small, and therefore can be ignored in some cases. C shown in FIG. 6 is a case where the size of the corner region in the radial direction of the electrode assembly 22 is not ignored. C shown in FIG. 8 is a case where the size of the corner region in the radial direction of the electrode assembly 22 is ignored.

Of course, in other embodiments, the upper limit of C can also be other values. For example, C≤7.5mm, C≤8.5mm, C≤9mm, etc.

The distance C between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the first protrusion 2412 does not exceed 8 mm, which can not only increase the creepage distance between the end cover 23 and the electrode terminal 241, but also reduce the height of the end cover 23. The risk of voltage breakdown is thereby reduced, thereby reducing the risk of safety problems caused by high-voltage breakdown and short circuit of the battery cells 20 .

As shown in FIG. 5 , in some embodiments, the surface of the first protruding portion 2412 facing the battery cell 20 is further away from the interior of the battery cell 20 than the surface of the second insulating portion 282 facing the battery cell 20 ; wherein, along In the axial direction of the electrode lead-out hole 232, the distance D between the surface of the first protruding portion 2412 facing the battery cell 20 and the surface of the second insulating portion 282 facing the battery cell 20 satisfies: 0mm<D≤3mm.

Of course, D can also have other value ranges according to actual needs.

The surface of the first protruding portion 2412 facing the battery cell 20 is further away from the interior of the battery cell 20 than the surface of the second insulating portion 282 facing the battery cell 20 , so that the second insulating portion 282 can better separate the fixing member 27 and the first protruding portion 2412 to further reduce the risk of short circuit of the battery cell 20 .

In other embodiments, the electrode terminal 241 may only include the main body part 2411 and not the first protruding part 2412.

As shown in FIG. 8 , in some embodiments, the fixing member 27 includes a fixing body 274 surrounding the main body 2411 , and one end of the fixing body 274 is connected to the surface of the end cover 23 away from the interior of the battery cell 20 ; along the electrode In the radial direction of the lead-out hole 232, the distance E between the inner surface of the fixed body 274 and the outer peripheral surface of the main body part 2411 satisfies: 0.3 mm ≤ E ≤ 2 mm.

The first limiting portion 271 is provided on the inner surface of the fixed body 274 , and the groove 272 is provided on the outer peripheral surface of the fixed body 274 . The fixed body 274 is conical, the outer circumferential surface of the fixed body 274 is a circumferential surface, the big end of the fixed body 274 is connected to the end cover 23, and the small end of the fixed body 274 extends to the side of the end cover 23 away from the inside of the battery cell 20 .

Of course, in other embodiments, the distance E between the inner surface of the fixed body 274 and the outer peripheral surface of the main body 2411 can also be in other value ranges.

The distance E between the inner surface of the fixed body 274 and the outer peripheral surface of the main body 2411 satisfies: 0.3mm≤E≤2mm, which facilitates the installation of an insulator between the fixed body 274 and the main body 2411, and the thickness of the insulator satisfies the insulation requirement. need.

As shown in Figure 8, in some embodiments, the inner diameter of the fixed body 274 is smaller than the inner diameter of the electrode lead-out hole 232; along the radial direction of the electrode lead-out hole 232, the inner surface of the end of the fixed body 274 connected to the end cover 23 is in contact with the electrode lead-out hole 232. The distance F between the hole walls 2321 satisfies: 0.5≤F≤4mm.

Since the fixed body 274 extends from the connection position with the end cover 23 to the side of the end cover 23 away from the interior of the battery cell 20 , there is a chamfered area at the connection position between the fixed body 274 and the end cover 23 , so that the fixed body 274 and the end cover 23 can be lowered. Stress is concentrated at the connection location of the end cap 23 . The existence of the chamfered area causes a distance between the end of the fixed body 274 closest to the interior of the battery cell 20 along the radial direction of the electrode lead-out hole 232 and the hole wall 2321 of the electrode lead-out hole, that is, the distance between the fixed body 274 and the end cover 23 is connected. The distance F between the inner surface of one end and the hole wall 2321 of the electrode lead-out hole. If F is too small, it will be inconvenient for the fixing member 27 and the end cover 23 to be integrally formed. If F is too large, the fixing member 27 and the current collecting member will not be formed. The distance between 25 is reduced, thereby reducing the creepage distance.

The distance F between the inner surface of one end of the fixed body 274 connected to the end cover 23 and the hole wall 2321 of the electrode lead-out hole satisfies: 0.5≤F≤4mm, which facilitates the fixation of the fixed body 274 on the end cover 23. Furthermore, the creepage distance between the connection portion 251 of the current collecting member 25 and the fixing member 27 is made larger, thereby reducing the risk of the fixing member 27 being broken down and causing a short circuit in the battery cell 20 .

As shown in FIG. 8 , in some embodiments, the terminal assembly 24 further includes a sealing member 29 disposed between the fixing member 27 and the electrode terminal 241 to sealingly connect the electrode terminal 241 and the fixing member 27 .

The sealing member 29 and the first insulating member 28 are independent structures. In other embodiments, the sealing member 29 may also be the first insulating member 28 , that is, the first insulating member 28 plays both an insulating and sealing role. In this embodiment, there is no need to fix the sealing member 29 . A sealing member 29 is additionally provided between the member 27 and the electrode terminal 241.

The sealing member 29 is provided between the fixing member 27 and the electrode terminal 241, which can improve the sealing performance between the fixing member 27 and the electrode terminal 241, thereby improving the sealing performance of the battery cell 20.

Please continue to refer to Figure 8. In some embodiments, the electrode terminal 241 includes a main body portion 2411; the fixing member 27 includes a flange 273 configured to extend in a direction close to the axis of the electrode lead hole 232 and located at the main body portion 2411. At least part of the sealing member 29 is located between the flange 273 and the main body portion 2411 on the side away from the inside of the battery cell 20 to restrict the movement of the electrode terminal 241 in a direction away from the inside of the battery cell 20 .

The flange 273 is connected to an end of the fixed body 274 away from the end cover 23 . The flange 273 has a circular ring structure, so that the flange 273 is formed with a central hole, and the electrical equipment can pass through the central hole of the flange 273 to connect to the electrode terminal 241, or other parts of the electrode terminal 241 can pass through the flange 273. The central hole is connected to electrical equipment.

The flange 273 is located on the side of the main body 2411 away from the inside of the battery cell 20 . The flange 273 can restrict the movement of the electrode terminal 241 away from the inside of the battery cell 20 , thereby improving the stability of the installation of the electrode terminal 241 . The second insulating part 282 is located on the side of the main body part 2411 facing the inside of the battery cell 20. The flange 273 and the second insulating part 282 jointly limit the position of the electrode terminal 241 in the axial direction of the electrode lead-out hole 232, further improving the Installation stability of the electrode terminal 241.

In some embodiments, the side of the main body 2411 facing away from the interior of the battery cell 20 has a second surface 2411b, and the electrode terminal 241 further includes a boss 2413. The boss 2413 protrudes from the main body 2411 from the second surface 2411b, and is sealed. The part of the member 29 is located between the second surface 2411b and the flange 273 , and the part of the sealing member 29 is located between the flange 273 and the outer peripheral surface of the boss 2413 .

The surface of the flange 273 facing away from the inside of the battery cell 20 and the surface of the boss 2413 facing away from the inside of the battery cell 20 may be flush or uneven. In some embodiments, the surface of the flange 273 facing away from the inside of the battery cell 20 is closer to the inside of the battery cell 20 than the surface of the boss 2413 facing away from the inside of the battery cell 20 or the flange 273 faces away from the inside of the battery cell 20 The surface of the boss 2413 is further away from the interior of the battery cell 20 than the surface of the boss 2413, so that the two are not flush. As shown in FIG. 8 , the surface of the flange 273 facing away from the inside of the battery cell 20 is closer to the inside of the battery cell 20 than the surface of the boss 2413 facing away from the inside of the battery cell 20 , that is, along the surface facing away from the inside of the battery cell 20 . In the direction, the boss 2413 protrudes from the inner surface of the flange 273 of the battery cell 20 , which facilitates the connection of the electrode terminal 241 with the electrical equipment so as to output the electric energy of the battery cell 20 .

The main body 2411 and the boss 2413 are both cylindrical. The diameter of the main body 2411 is larger than the diameter of the boss 2413, so the inner circumferential surface of the flange 273 faces the outer circumferential surface of the boss 2413.

Part of the seal 29 is located between the second surface 2411b and the boss 2413, and part of the seal 29 is located between the flange 273 and the outer peripheral surface of the boss 2413, which can increase the contact area between the seal 29 and the electrode terminal 241 and The contact area between the sealing member 29 and the flange 273 is increased, and the sealing performance between the fixing member 27 and the electrode terminal 241 is improved.

Please continue to refer to FIG. 8 . In some embodiments, the battery cell 20 further includes a second insulating member 210 . The second insulating member 210 includes a connected insulating body 2101 and an extension 2102 . The insulating body 2101 is disposed on the end cover 23 On the side facing the inside of the battery cell 20 , along the axial direction of the electrode lead-out hole 232 , the extension portion 2102 extends from the insulating body 2101 in a direction closer to the electrode terminal 241 into the electrode lead-out hole 232 and surrounds the connecting portion 251 On the outside, there is a hole wall 2321 that separates the connecting portion 251 and the electrode lead-out hole.

The extension part 2102 may extend to offset the end of the electrode terminal 241 facing the inside of the battery cell 20 or the end of the second insulating part 282 facing the inside of the battery cell 20 , or it may extend with the electrode terminal 241 in the axial direction of the electrode lead-out hole 232 There is a certain gap on it.

The insulating body 2101 of the second insulating member 210 is disposed on the side of the end cover 23 facing the inside of the battery cell 20, which can separate the electrode assembly 22 and the end cover 23 and prevent the electrode assembly 22 and the end cover 23 from contacting the battery cell 20 short circuit. The extension part 2102 of the second insulating member 210 extends into the electrode lead-out hole 232 and is located outside the connection part 251 of the current collecting member 25. It can separate the connection part 251 and the hole wall 2321 of the electrode lead-out hole, and lower the connection part 251 and the end cover. 23 contact leads to the risk of short-circuiting the battery cells 20.

An embodiment of the present application also provides a battery 100. The battery 100 includes the battery cell 20 provided in any of the above embodiments.

In any of the above embodiments, there is a large creepage distance between the end cover 23 of the battery cell 20 and the current collecting member 25, which reduces the risk of the end cover 23 being broken down by high voltage, thereby reducing the risk of the battery cell 20 being broken down by high voltage. There is a risk of safety problems caused by short circuit, thereby improving the safety performance of the battery 100.

This embodiment of the present application provides an electrical device. The electrical device includes the battery cell 20 provided in any of the above embodiments.

In any of the above embodiments, there is a large creepage distance between the end cover 23 of the battery cell 20 and the current collecting member 25, which reduces the risk of the end cover 23 being broken down by high voltage, thereby reducing the risk of the battery cell 20 being broken down by high voltage. Reduce the risk of safety problems caused by short circuits, thereby improving electrical safety.

As shown in Figure 9, the embodiment of the present application also provides a battery cell manufacturing equipment 2000. The battery cell manufacturing equipment 2000 includes a providing device 2100 and an assembly device 2200; the providing device 2100 is configured to provide a case 21, an electrode Component 22, end cover 23, terminal assembly 24 and current collecting member 25, the housing 21 has an opening 211, the electrode assembly 22 has a tab 221, the end cover 23 is provided with an electrode lead-out hole 232; the terminal assembly 24 includes an electrode terminal 241, and the electrode The terminal 241 is provided corresponding to the electrode lead-out hole 232, and the electrode terminal 241 is used to output the electric energy of the battery cell 20; the assembly device 2200 is configured to accommodate the electrode assembly 22 in the housing 21 and connect the current collecting member 25 to the electrode terminal 241 and between the electrode terminal 241 and the tab 221 to achieve electrical connection between the electrode terminal 241 and the tab 221; wherein, the current collecting member 25 has a connecting portion 251 located in the electrode lead-out hole 232, the connecting portion 251 is used to connect the electrode terminal 241, and is led out along the electrode In the radial direction of the hole 232, the minimum distance H between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the connecting portion 251 satisfies H ≥ 2 mm.

As shown in FIG. 10 , embodiments of the present application also provide a method for manufacturing the battery cell 20 . The method for manufacturing the battery cell 20 includes:

S100, provide a housing 21, an electrode assembly 22, an end cover 23, a terminal assembly 24 and a current collecting member 25. The housing 21 has an opening 211, the electrode assembly 22 has a tab 221, and the end cover 23 is provided with an electrode lead-out hole 232; terminal The assembly 24 includes an electrode terminal 241, which is arranged corresponding to the electrode lead-out hole 232. The electrode terminal 241 is used to output the electric energy of the battery cell 20;

S200, accommodate the electrode assembly 22 in the housing 21;

S300, connect the current collecting member 25 between the electrode terminal 241 and the tab 221 to achieve electrical connection between the electrode terminal 241 and the tab 221;

Among them, the current collecting member 25 has a connecting portion 251 located in the electrode lead-out hole 232. The connecting portion 251 is used to connect the electrode terminal 241. Along the radial direction of the electrode lead-out hole 232, the hole wall 2321 of the electrode lead-out hole and the outer periphery of the connecting portion 251 The minimum distance H between walls satisfies H≥2mm.

The embodiment of the present application provides a battery cell 20. The battery cell 20 includes a case 21, an electrode assembly 22, an end cover 23, a terminal assembly 24, a current collecting member 25, a fixing member 27, a first insulating member 28, and a sealing member. 29 and the second insulating member 210.

The housing 21 has an opening 211 . The electrode assembly 22 is accommodated in the housing 21 . The end cap 23 is used to cover the opening 211, and the end cap 23 is provided with an electrode lead-out hole 232. The terminal assembly 24 includes an electrode terminal 241 , which is arranged corresponding to the electrode lead-out hole 232 . The electrode terminal 241 is used to output the electric energy of the battery cell 20 .

The current collecting member 25 is used to realize electrical connection between the electrode terminal 241 and the tab 221 of the electrode assembly 22 . The current collecting member 25 has a connecting portion 251 located in the electrode lead-out hole 232 , and the connecting portion 251 is used to connect the electrode terminal 241 .

The fixing member 27 is connected to the end cover 23 and surrounds the outer periphery of the electrode terminal 241. The fixing member 27 includes a fixing body 274 and a flange 273. One end of the fixing body 274 is connected to the end cover 23, and the other end is connected to the flange 273.

The electrode terminal 241 includes a main body part 2411, a first protruding part 2412, and a boss 2413. The main body 2411 has a first surface 2411a and a second surface 2411b that are opposite to each other along the axial direction of the electrode lead-out hole 232. The first surface 2411a is closer to the inside of the battery cell 20 than the second surface 2411b. The first protruding portion 2412 is connected to the first surface 2411a, and the boss 2413 is connected to the second surface 2411b. The first insulating portion 281 of the first insulating member 28 is surrounding the outer periphery of the main body portion 2411 to separate the main body portion 2411 and the fixing member 27 . The second insulating portion 282 of the first insulating member 28 is located on the side of the main body portion 2411 facing the interior of the battery cell 20 and is connected to the first surface 2411a to restrict the movement of the electrode terminal 241 toward the interior of the battery cell 20. The second insulating part 282 is also surrounding the outer circumference of the first protruding part 2412 and connected with the outer circumferential surface of the first protruding part 2412 .

Part of the sealing member 29 is sealed between the flange 273 and the second surface 2411b, and part of the sealing member 29 is sealed between the inner peripheral surface of the flange 273 and the outer peripheral surface of the boss 2413.

The insulating body 2101 of the second insulating member 210 is disposed on the side of the end cover 23 facing the inside of the battery cell 20 . Along the axial direction of the electrode lead-out hole 232 , the extending portion 2102 of the second insulating member 210 extends from the insulating body 2101 to The hole wall 2321 extends in a direction close to the electrode terminal 241 into the electrode lead-out hole 232 and surrounds the outside of the connecting portion 251 to separate the connecting portion 251 and the electrode lead-out hole.

Along the radial direction of the electrode lead-out hole 232, the minimum distance H between the hole wall 2321 of the electrode lead-out hole and the outer peripheral wall of the connecting portion 251 satisfies H≥2mm, then there is a large gap between the end cover 23 and the current collecting member 25. The creepage distance reduces the risk of the end cover 23 being broken down by high voltage, thereby reducing the risk of the battery cell 20 causing safety problems due to high voltage breakdown and short circuit.

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

Claims (25)

1. A battery cell including:

   A shell with an opening;

   An electrode assembly is accommodated in the housing, and the electrode assembly has tabs;

   An end cap, used to cover the opening, and the end cap is provided with an electrode lead-out hole;

   A terminal assembly includes an electrode terminal, the electrode terminal is arranged corresponding to the electrode lead-out hole, and the electrode terminal is used to output the electric energy of the battery cell;

   a current collecting member configured to be connected between the electrode terminal and the tab to achieve electrical connection between the electrode terminal and the tab;

   Wherein, the current collecting member has a connection part located in the electrode lead-out hole, the connection part is used to connect the electrode terminal, along the radial direction of the electrode lead-out hole, the hole wall of the electrode lead-out hole and The minimum distance H between the peripheral walls of the connecting portion satisfies H ≥ 2 mm.
2. The battery cell according to claim 1, wherein H satisfies: H≥3mm.
3. The battery cell according to claim 1 or 2, wherein H satisfies: H≤10mm.
4. The battery cell according to any one of claims 1 to 3, wherein along the axial direction of the electrode lead-out hole, the projection of the electrode terminal on the end cap is located in the electrode lead-out hole.
5. The battery cell according to any one of claims 1 to 4, wherein the terminal assembly further includes a fixing part connected to the end cover, the fixing part being along the circumferential direction of the electrode terminal Cover the outside of the electrode terminal to fix the electrode terminal to the end cap.
6. The battery cell according to claim 5, wherein the fixing member and the end cap are integrally formed.
7. The battery cell according to claim 5 or 6, wherein the terminal assembly further includes a first insulating member disposed between the fixing member and the electrode terminal to separate the fixing piece and the electrode terminal.
8. The battery cell according to claim 7, wherein the first insulating part is an injection molded part between the fixing part and the electrode terminal.
9. The battery cell according to claim 7 or 8, wherein the inner peripheral surface of the fixing member is provided with an inwardly protruding first limiting portion, and the first insulating member is provided with a first limiting portion for the first limiting portion. The first recessed portion is inserted into the first recessed portion, and the first limiting portion is configured to be inserted into the first recessed portion to fix the fixing member and the first insulating member.
10. The battery cell according to claim 9, wherein the inner peripheral surface of the fixing member is provided with a plurality of first limiting portions arranged at intervals, and the first insulating member is provided with a plurality of said first limiting portions arranged at intervals. As for the first recessed portion, the first limiting portion and the first recessed portion are arranged in one-to-one correspondence.
11. The battery cell according to claim 9 or 10, wherein the fixing member is provided with a groove on its outer peripheral surface, and a protrusion is formed on the inner peripheral surface of the fixing member at a position corresponding to the groove. The first limiting portion is on the inner peripheral surface of the fixing member.
12. The battery cell according to any one of claims 7 to 11, wherein the electrode terminal includes a main body part, the first insulating member includes a connected first insulating part and a second insulating part, the first insulating part The main body part has a first surface facing the inside of the battery cell, and the second insulating part is located on one side of the first surface and connected with the first surface. contact to restrict the movement of the main body portion in a direction closer to the inside of the battery cell.
13. The battery cell according to claim 12, wherein the electrode terminal further includes a first protruding portion protruding from the first surface of the main body portion, and the second insulating part is located around the outer periphery of the first protruding part.
14. The battery cell according to claim 13, wherein the distance C between the hole wall of the electrode lead-out hole and the outer peripheral wall of the first protrusion along the radial direction of the electrode lead-out hole satisfies: C≤8mm.
15. The battery cell according to claim 13 or 14, wherein a surface of the first protruding portion facing the battery cell is further away from the battery cell than a surface of the second insulating portion facing the battery cell. internal;

    Wherein, along the axial direction of the electrode lead-out hole, the distance D between the surface of the first protruding part facing the battery cell and the surface of the second insulating part facing the battery cell satisfies: 0mm&lt; D≤3mm.
16. The battery cell according to any one of claims 12 to 15, wherein the fixing member includes a fixing body surrounding the main body, and one end of the fixing body and the end cover are away from the battery. Surface connections within the monomer;

    Along the radial direction of the electrode lead-out hole, the distance E between the inner surface of the fixed body and the outer peripheral surface of the main body satisfies: 0.3mm≤E≤2mm.
17. The battery cell according to claim 16, wherein the inner diameter of the fixed body is smaller than the inner diameter of the electrode lead-out hole;

    Along the radial direction of the electrode lead-out hole, the distance F between the inner surface of one end of the fixed body connected to the end cap and the hole wall of the electrode lead-out hole satisfies: 0.5≤F≤4mm.
18. The battery cell according to any one of claims 5 to 17, wherein the terminal assembly further includes a sealing member disposed between the fixing member and the electrode terminal to sealingly connect the electrodes. terminals and fixings.
19. The battery cell according to claim 18, wherein the electrode terminal includes a main body portion;

    The fixing member includes a flange, the flange is configured to extend in a direction close to the axis of the electrode lead-out hole and is located on a side of the main body portion away from the interior of the battery cell to limit the electrode. The terminal moves in a direction away from the interior of the battery cell, and at least part of the seal is located between the flange and the body portion.
20. The battery cell according to claim 19, wherein a side of the main body portion facing away from the interior of the battery cell has a second surface, and the electrode terminal further includes a boss, and the boss is formed from the first surface. Two surfaces protrude from the main body, a portion of the sealing member is located between the second surface and the flange, and a portion of the sealing member is located between the flange and the outer peripheral surface of the boss. between.
21. The battery cell according to any one of claims 1 to 20, wherein the battery cell further includes a second insulating member, the second insulating member includes a connected insulating body part and an extension part, the insulating body The extension portion is disposed on the side of the end cover facing the interior of the battery cell, along the axial direction of the electrode lead-out hole, and the extension portion extends from the insulating body portion in a direction close to the electrode terminal to the The electrode lead-out hole is located inside the electrode lead-out hole and surrounds the outside of the connecting portion to separate the connecting portion and the hole wall of the electrode lead-out hole.
22. A battery, comprising the battery cell according to any one of claims 1-21.
23. An electrical device, comprising the battery cell according to any one of claims 1-21.
24. A battery cell manufacturing equipment, including:

    Provide a device configured to provide a housing, an electrode assembly, an end cover, a terminal assembly and a current collecting member, the housing has an opening, the electrode assembly has a pole lug, and the end cover is provided with an electrode lead-out hole; The terminal assembly includes an electrode terminal, the electrode terminal is arranged corresponding to the electrode lead-out hole, and the electrode terminal is used to output the electric energy of the battery cell;

    An assembly device configured to accommodate the electrode assembly in the housing and connect the current collecting member between the electrode terminal and the tab to realize electrical connection between the electrode terminal and the tab. connect;

    Wherein, the current collecting member has a connection part located in the electrode lead-out hole, the connection part is used to connect the electrode terminal, along the radial direction of the electrode lead-out hole, the hole wall of the electrode lead-out hole and The minimum distance H between the peripheral walls of the connecting portion satisfies H ≥ 2 mm.
25. A method of manufacturing a battery cell, which includes:

    A housing, an electrode assembly, an end cover, a terminal assembly and a current collecting member are provided, the housing has an opening, the electrode assembly has a pole lug, the end cover is provided with an electrode lead-out hole; the terminal assembly includes an electrode terminal, The electrode terminal is arranged corresponding to the electrode lead-out hole, and the electrode terminal is used to output the electric energy of the battery cell;

    accommodating the electrode assembly in the housing;

    Connect the current collecting member between the electrode terminal and the tab to achieve electrical connection between the electrode terminal and the tab;

    Wherein, the current collecting member has a connection part located in the electrode lead-out hole, the connection part is used to connect the electrode terminal, along the radial direction of the electrode lead-out hole, the hole wall of the electrode lead-out hole and The minimum distance H between the peripheral walls of the connecting portion satisfies H ≥ 2 mm.

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