WO2023133783A1 - Battery cell, manufacturing method and manufacturing device therefor, battery, and electric apparatus - Google Patents

Abstract

Provided in the embodiments of the present application are a battery cell, a manufacturing method and a manufacturing device therefor, a battery and an electric apparatus. The battery cell comprises: a housing (1), provided with an opening (11), the housing (1) having a first side wall (12) adjacently connected to the opening (11), and the first side wall (12) being provided with a recess (121); an electrode assembly (3) provided in the housing (1); and a first heat exchange part (4), which is provided outside the first side wall (12) and located in the recess (121) and is configured to exchange heat with the housing (1).

Description

Battery cell, manufacturing method thereof, manufacturing equipment, battery, and electrical device technical field

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

Background technique

Lithium batteries have the advantages of high energy density, high power density, many cycle times, and long storage time, and have been widely used in electric vehicles.

However, the battery in electric vehicles generates more heat during long-term operation, and it is difficult to achieve a better heat dissipation effect, which will affect the working performance of the battery.

Contents of the invention

The purpose of this application is to improve the working performance of the battery.

According to the first aspect of the present application, a battery cell is provided, including:

The housing is provided with an opening, the housing has a first side wall adjacent to the opening, and a concave portion is provided on the first side wall;

an electrode assembly disposed within the housing; and

The first heat exchanging part is arranged on the outside of the first side wall and is located in the concave part, and is configured to exchange heat with the casing.

In some embodiments, the housing has two first side walls oppositely disposed, and a first heat exchange portion is disposed in a concave portion of each first side wall.

In some embodiments, the housing has a second side wall, the opening is disposed toward the first direction, the second side wall is disposed opposite to the opening, and in the first direction, the first side end of the first heat exchange part is against the recess. The outer side wall of the inlet part, the second side end of the first heat exchange part is not lower than the second side wall.

In some embodiments, the casing has a second side wall, and the second side wall is disposed opposite to the opening, and the battery cell further includes a second heat exchanging portion, and the second heat exchanging portion is disposed outside the second side wall, configured as Exchange heat with the shell.

In some embodiments, the opening is set toward the first direction, the concave portion is set at an end close to the second side wall along the first direction, and the end portion of the second heat exchange portion along the second direction extends to abut against the first heat exchange portion. catch.

In some embodiments, the casing has two first side walls oppositely arranged, and a first heat exchange part is provided in the concave part of each first side wall, and the second heat exchange part is connected with the two first heat exchange parts. The thermal part is integrally formed.

In some embodiments, the opening is set toward the first direction, and the electrode assembly further includes a main body and two types of tabs with opposite polarities, and the two types of tabs are drawn out from both ends of the main body along a second direction, and the second direction is vertical In the first direction, the tab and the concave portion on the same side are staggered along the first direction;

The battery cell also includes an end cap assembly and two adapters. The end cap assembly is configured to close the opening and includes an end cap body and two types of electrode terminals with opposite polarities arranged on the end cap body. The adapter is configured to The tabs on the same side along the second direction are electrically connected to the electrode terminals.

In some embodiments, the adapter includes a first part and a second part connected at an angle, the first part is connected to the tab, and the second part is connected to the electrode terminal.

In some embodiments, the free end of the first part protrudes beyond the end of the tab along the first direction, and there is a first predetermined gap L1 between the inner sidewall of the concave part opposite to the first part.

In some embodiments, the adapter further includes a third part, the third part is connected to an end of the second part away from the first part, and the third part is located between the main part and the recessed part.

In some embodiments, the free end of the first part does not exceed the end of the tab along the first direction.

In some embodiments, the electrode assembly is a wound structure, and the winding axis of the electrode assembly is arranged along the second direction, the electrode assembly has a flat surface, the flat surface is arranged perpendicular to a third direction, and the third direction is perpendicular to the first direction and Second Direction; and/or

The electrode assembly is a stacked structure, and the electrode assembly has a first pole piece and a second pole piece with opposite polarities and are stacked along a third direction, and the third direction is perpendicular to the first direction and the second direction.

In some embodiments, the battery cell further includes an end cap assembly for closing the opening, and the opening is disposed toward the first direction. The electrode assembly further includes a main body and two kinds of tabs with opposite polarities. The end exits in a first direction toward the end cap assembly.

In some embodiments, the body portion is of equal width along the first direction.

In some embodiments, the main body portion is divided into a first sub-section and a second sub-section along the first direction, and the end of the first sub-section along the second direction exceeds the end of the second sub-section, so that in the first sub-section The junction with the second sub-section forms a step, and the end of the first sub-section extends along a second direction beyond the inner wall of the recess opposite to the main body; wherein the second direction is perpendicular to the first direction.

In some embodiments, the electrode assembly is a wound structure, and the winding axis of the electrode assembly is arranged along the first direction, the electrode assembly has a flat surface, and the flat surface is arranged perpendicular to the third direction; and/or

The electrode assembly is a stacked structure, and the electrode assembly has a first pole piece and a second pole piece with opposite polarities and superimposed along the third direction;

Wherein, the first side wall is located on the side of the main body along the second direction, and the third direction is perpendicular to the first direction and the second direction.

According to a second aspect of the present application, a battery module is provided, including the battery cell of the above embodiment.

In some embodiments, the openings are arranged facing the first direction, and the plurality of battery cells are divided into multiple groups of sub-modules along the second direction, the second direction is perpendicular to the first direction, and the adjacent two groups of sub-modules are arranged along the second direction The recessed parts of the two battery cells are oppositely arranged, and the two first heat exchange parts in the two recessed parts are integrally arranged.

In some embodiments, the casing has a second side wall, and the second side wall is disposed opposite to the opening, and the battery cell further includes a second heat exchanging portion, and the second heat exchanging portion is disposed outside the second side wall, along the second The second heat exchanging parts of the plurality of battery cells arranged in one direction are integrated with the first heat exchanging parts.

In some embodiments, the outermost first heat exchange portion along the second direction is flush with the first side wall or exceeds the first side wall.

According to a third aspect of the present application, a battery is provided, including the battery cell and/or the battery module of the above embodiment.

According to a fourth aspect of the present application, an electric device is provided, including the battery cell, and/or the battery module, and/or the battery of the above embodiment.

According to a fifth aspect of the present application, a method for manufacturing a battery cell is provided, including:

The shell providing step: providing a shell, the shell is provided with an opening, and the shell has a first side wall adjacent to the opening, and a concave portion is provided on the first side wall;

Electrode placement step: placing the electrode assembly in the housing;

The step of installing the heat exchanging part: setting the first heat exchanging part outside the first side wall and inside the concave part, so as to exchange heat with the casing.

According to a sixth aspect of the present application, there is provided a battery cell manufacturing equipment, including:

The housing providing device is configured to provide a housing, the housing is provided with an opening, and the housing has a first side wall adjacent to the opening, and a concave portion is provided on the first side wall;

an electrode placement device configured to locate the electrode assembly within the housing; and

The heat exchanging part installation device is configured such that the first heat exchanging part is arranged outside the first side wall and located in the concave part, so as to exchange heat with the casing.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

FIG. 1 is a structural schematic diagram of some embodiments of the present application in which batteries are installed in vehicles.

Fig. 2 is a schematic structural diagram of some embodiments of the battery of the present application.

FIG. 3 is a cross-sectional view of the first embodiment of the battery cell of the present application.

FIG. 4 is a schematic diagram of the battery cell shown in FIG. 3 hiding the first heat exchange portion and the second heat exchange portion.

FIG. 5 is a cross-sectional view of a second embodiment of a battery cell of the present application.

FIG. 6 is a cross-sectional view of a third embodiment of a battery cell of the present application.

Fig. 7 is a schematic structural view of some embodiments of an electrode assembly in a wound structure.

Fig. 8 is a schematic structural view of some embodiments of electrode assemblies in a laminated structure.

FIG. 9 is a cross-sectional view of a fourth embodiment of a battery cell of the present application.

FIG. 10 is a cross-sectional view of a fifth embodiment of a battery cell of the present application.

Fig. 11 is a cross-sectional view of some embodiments of the battery module of the present application.

Fig. 12 is a cross-sectional view of other embodiments of the battery module of the present application.

FIG. 13 is a schematic flowchart of some embodiments of the battery cell manufacturing method of the present application.

Fig. 14 is a schematic diagram of the module composition of some embodiments of the battery cell manufacturing equipment of the present application.

In the drawings, the drawings are not drawn to scale.

Mark Description:

100. Battery cell; 1. Shell; 11. Opening; 12. First side wall; 121. Recess; 13. Second side wall; 2. End cover assembly; 21. End cover body; 22. Electrode terminal 3. Electrode assembly; 31. Main body; 311. First sub-part; Diaphragm; 36. Flat surface; 37. Arc surface; 4. First heat exchange part; 5. Second heat exchange part; 6. Adapter; 61. First part; 62. Second part; 63. Second part three;

200, battery module; 200', sub-module;

300, battery; 301, shell assembly; 301A, box body; 301B, cover body;

400, vehicle; 401, axle; 402, wheel; 403, motor; 404, controller;

500. Manufacturing equipment; 510. Housing providing device; 520. Electrode placing device; 530. Heat exchange part installation device;

x, first direction; y, second direction; z, third direction; K, winding axis.

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The detailed description and accompanying drawings of the following embodiments are used to illustrate the principle of the application, but cannot be used to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, the meaning of "plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", " The orientation or positional relationship indicated by "outside" and so on are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 reference to this application. Application Restrictions.

In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. The orientation words appearing in the following description are the directions shown in the figure, and do not limit the specific structure of the application.

In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least some of the embodiments of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two), and "multiple pieces" refers to More than two pieces (including two pieces).

The present application adopts the descriptions of directions or positional relationships indicated by "upper", "lower", "top", "bottom", "front", "back", "inner" and "outer", which are only for convenience The present application is described without indicating or implying that the referred device must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the scope of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, and the like.

The battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in this embodiment of the present application. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.

Current battery cells generally include a casing and an electrode assembly accommodated in the casing, and electrolyte is filled in the casing. The electrode assembly is mainly formed by stacking or winding a first pole piece and a second pole piece with opposite polarities, and a diaphragm is usually arranged between the first pole piece and the second pole piece. The part of the first pole piece and the second pole piece coated with the active material constitutes the main body of the electrode assembly, and the part of the first pole piece and the second pole piece not coated with the active material constitutes the first tab and the second tab respectively. . In a lithium-ion battery, the first pole piece can be a positive pole piece, including a positive current collector and a positive active material layer arranged on both sides of the positive current collector. The material of the positive current collector can be aluminum, for example, and the positive active material can be, for example, Lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc.; the second pole piece can be a negative pole piece, including a negative electrode current collector and a negative electrode active material layer arranged on both sides of the negative electrode current collector, and the material of the negative electrode current collector For example, it may be copper, and the negative electrode active material may be, for example, graphite or silicon. The first tab and the second tab can be located at one end of the main body together or at two ends of the main body respectively. During the charge and discharge process of the battery cell, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the terminals to form a current loop.

The inventor found in practice that the battery generates a lot of heat during long-term work, and it is difficult to achieve a better heat dissipation effect, which will affect the performance of the battery, making it difficult for the battery to achieve better performance parameters during the discharge process, or during the charging process. High-rate applications with limited fast charging. Or if the battery is used in a low-temperature environment, it is difficult for the battery to perform optimally due to the low temperature.

Based on the discovery of the above technical problems, the inventor thought of installing a heat exchange component outside the battery cell. Taking heat dissipation during battery operation as an example, the location of the heat exchange component will greatly affect the heat dissipation effect of the battery cell. Through analysis and experiments, it is found that the temperature of the battery cell is higher near the electrode terminal, the tab or the adapter. The adapter is used to connect the electrode terminal and the tab. area. According to this idea, the present application improves the battery cell.

The battery cells, battery modules, and battery cells of the present application can be used in electrical devices, and can provide electrical energy for electrical devices. The devices can be mobile phones, portable devices, notebook computers, battery cars, electric vehicles, ships, spacecraft, electric toys And electric tools, etc., for example, spacecraft include airplanes, rockets, space shuttles and spaceships, etc., electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplanes Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric plane.

As shown in Figure 1, the electrical device can be a vehicle 400, such as a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; or the electrical device can also be a drone or a ship, etc. . Specifically, the vehicle 400 may include an axle 401, a wheel 402 connected to the axle 401, a motor 403, a controller 404 and a battery 300, the motor 403 is used to drive the axle 401 to rotate, and the controller 404 is used to control the operation of the motor 403, The battery 300 can be arranged at the bottom, head or tail of the vehicle 400 to provide electric energy for the operation of the motor 403 and other components in the vehicle.

FIG. 2 is a schematic structural diagram of some embodiments of a battery 300 of the present application, and the battery 300 includes a casing assembly 301 and a battery cell 100 . In the battery 300, there may be one or more battery cells 100 . If there are multiple battery cells 100, the multiple battery cells 100 can be connected in series, parallel or mixed. 100 are firstly connected in series or parallel or mixed to form a battery module 200 , and then a plurality of battery modules 200 are connected in series or parallel or mixed to form a whole and accommodated in the housing assembly 301 . It may also be that all the battery cells 100 are directly connected in series, in parallel or mixed together, and then all the battery cells 100 are housed in the housing assembly 301 as a whole.

The inside of the housing assembly 301 is a hollow structure, and at least one battery module 200 is accommodated in the housing assembly 301 . For example, the housing assembly 301 may include a case 301A and a cover 301B. The box body 301A and the cover body 301B are fastened together. For example, both the box body 301A and the cover body 301B can be hollow cuboids and each has only one face as an opening surface, the opening of the box body 301A is opposite to the opening of the cover body 301B, and the box body 301A and the cover body 301B are interlocked to form a A box with a closed chamber. It can also be that the box 301A is a cuboid with an opening and the cover 301B is a plate, or the cover 301B is a cuboid with an opening and the box 301A is a plate, and the box 301A and the cover 301B are arranged oppositely and snapped together. A box is formed with a closed chamber. After at least one battery module 200 is connected in parallel, in series or mixed, it is placed in a closed chamber formed by fastening the box body 301A and the cover body 301B.

In some embodiments, as shown in FIG. 3 and FIG. 4 , the present application provides a battery cell 100 , including a casing 1 , an electrode assembly 3 and a first heat exchange part 4 . Wherein, the housing 1 is provided with an opening 11, and the housing 1 has a first side wall 12 adjacent to the opening 11, and the first side wall 12 is provided with a concave portion 121; the electrode assembly 3 is arranged in the housing 1; the first replacement The heat part 4 is disposed outside the first side wall 12 and located in the concave part 121 , configured to exchange heat with the casing 1 to adjust the temperature of the electrode assembly 3 .

Wherein, the casing 1 is a hollow structure for accommodating the electrode assembly 3 . The battery cell 100 may further include an end cap assembly 2 for closing the opening 11 , and the end cap assembly 2 may include an end cap body 21 and two kinds of electrode terminals 22 with opposite polarities. For example, for a rectangular parallelepiped battery cell 100, the casing 1 has a hollow rectangular parallelepiped structure, the end cap body 21 has a rectangular plate-like structure, and the two types of electrode terminals 22 are respectively a positive terminal and a negative terminal, and one electrode terminal 22 can be provided. Alternatively, multiple electrodes may be provided, and the electrode terminals 22 may be in the form of rectangular columns or cylinders.

The electrode assembly 3 may adopt a wound structure or a laminated structure. The electrode assembly 3 may include a main body 31 and two kinds of tabs 32 with opposite polarities. The tabs 32 are drawn out from the side ends of the main body 31, and the tabs 32 may be directly electrically connected to the electrode terminals 22; or the battery cell 100 may also be Including the adapter 6 , the tab 32 is electrically connected to the electrode terminal 22 through the adapter 6 .

For example, the electrode assembly 3 has a positive electrode sheet and a negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and positive active material layers arranged on both sides of the positive electrode collector. Negative and positive active material layers, the part of the positive pole piece and the negative pole piece coated with the active material constitutes the main body 31 of the electrode assembly 3, and the parts of the positive pole piece and the negative pole piece that are not coated with the active material constitute the positive pole lug and the negative pole respectively. extremely ear.

The casing 1 has a first side wall 12 adjacent to the opening 11, if the opening 11 is arranged facing the first direction x, then the first side wall 12 is arranged perpendicular to the second direction y, and the second direction y is perpendicular to the first direction x, There are four first side walls 12 adjacent to the opening 11 , and recessed portions 121 may be provided on one, two or more of the first side walls 12 . When the thickness of the first side wall 12 is relatively large, the concave portion 121 can be a groove directly opened on the outer surface of the first side wall 12; or when the thickness of the first side wall 12 is small, the concave portion 121 It may be that a part of the first side wall 12 is recessed toward the electrode assembly 3 as a whole to form a concave portion 121 . The recessed portion 121 can be provided in a closed area on the first side wall 12 , or can also be provided at a position close to the edge of the first side wall 12 , so that at least part of the sides of the recessed portion 121 are open.

The first heat exchange part 4 is arranged outside the first side wall 12 and is located in the recessed part 121. When a plurality of battery cells 100 are grouped, no additional space is required in the second direction y. The first heat exchange part 4 and the The housing 1 can be realized in contact or with a gap. The first heat exchange part 4 may adopt a plate structure, such as a rectangular or other shaped plate structure. The first heat exchange part 4 can be fixed to the housing 1 by bonding or fasteners.

When the battery cell 100 works in a high-temperature environment, or generates a large amount of heat during long-term operation, the first heat exchange part 4 is used to dissipate heat from the battery cell 100 . The first heat exchanging part 4 can be a heat dissipation plate, on which heat dissipation fins are arranged to enhance the heat dissipation effect. Optionally, the first heat exchange part 4 is used to contain fluid to actively cool the battery cell 100, and the fluid can be liquid or gas. At this time, the first heat exchange part 4 can also be called a cooling component, a cooling system or a cooling system. Plates, etc., the fluid contained in it can also be called cooling medium or cooling fluid, more specifically, it can be called cooling liquid or cooling gas, the cooling liquid can be a mixture of water, water and ethylene glycol, and the cooling gas can be air wait.

. Optionally, the first heat exchange part 4 can also be actively cooled by controlling the conductive components.

When the battery cells 100 work in a low temperature environment, the first heat exchanging part 4 can also be used for heating to raise the temperature of the multiple battery cells 100 so that the battery cells 100 are at an appropriate working temperature to fully exert the battery performance. Optionally, the first heat exchanging portion 4 is used to contain fluid to actively heat the battery cell 100 , and the fluid may be liquid or gas. Optionally, the first heat exchange part 4 can also be actively heated by controlling the conductive components.

The battery cell 100 of this embodiment is provided with the first heat exchanging part 4 on the first side wall 12 of the casing 1, since the first side wall 12 is adjacent to the opening 11, it is closer to the tab 32, the electrode terminal 22 or the adapter. In areas with relatively large heat generation, such as part 6, the heat exchange between the first heat exchange part 4 and the housing 1 can achieve a better temperature adjustment effect, improve the response speed of temperature adjustment, and thereby adjust the temperature of the electrode assembly 3, so that the electrode assembly The active material in 3 works at a suitable temperature to fully exert its performance, such as improving the discharge performance to achieve better performance parameters, or increasing the fast charging rate, and also improving the working reliability and safety of the battery cell 100 .

Moreover, since the first heat exchange part 4 is arranged in the recessed part 121, it can reduce the occupancy of the space other than the first side wall 12, and it is convenient to combine a plurality of battery cells 100 into the battery module 200, which can reduce the size of the battery module 200. volume of. For example, the first side wall 12 is perpendicular to the second direction y. If a plurality of battery cells 100 are arranged side by side in the second direction y, the adjacent battery cells 100 can be arranged in contact, which is beneficial to balance the multiple battery cells 100 in the battery module 200. The temperature of the battery cell 100 . In addition, the first heat exchange part 4 can realize at least one of the functions of cooling and heating, and the function of the first heat exchange part 4 can be set according to the working requirements of the battery cells 100 , which has strong versatility.

In some embodiments, the casing 1 has two first side walls 12 oppositely disposed, and the first heat exchange portion 4 is disposed in the concave portion 121 of each first side wall 12 .

Wherein, if the opening 11 is disposed toward the first direction x, the two first sidewalls 12 are both perpendicular to the second direction y, and are located at both ends of the electrode assembly 3 along the second direction y. For example, the concave portions 121 of the two opposite first sidewalls 12 can be arranged facing each other, and the shape and size of the two concave portions 121 can be the same, so as to reduce the difficulty of the manufacturing process and simplify the layout of other components.

In this embodiment, the first heat exchange parts 4 are provided in the concave parts 121 of the two opposite first side walls 12, so that the two sides of the electrode assembly 3 along the second direction y can simultaneously exchange heat, and the heat exchange efficiency can be improved. , and make the temperature inside the electrode assembly 3 more uniform, which is beneficial to improve the working performance of the battery cell 100 . For example, if the heat is dissipated through the first heat exchanging part 4, the heat dissipation performance of the battery cell 100 during operation can be improved to keep working at an appropriate temperature, thereby improving the performance, reliability and safety of the battery cell 100. sex.

In some embodiments, the housing 1 has a second side wall 13, the opening 11 is disposed toward the first direction x, the second side wall 13 is disposed opposite to the opening 11, and in the first direction x, the first heat exchange part 4 The first side end abuts against the outer wall of the concave portion 121 , and the second side end of the first heat exchange portion 4 is not lower than the second side wall 13 .

Wherein, the side wall of the concave portion 121 abutting against the first side end of the first heat exchange portion 4 may be perpendicular to the first direction x, or be inclined. In the second direction y, the first heat exchange portion 4 is flush with the outer surface of the first side wall 12 outside the concave portion 121 , which can maximize the heat exchange effect without increasing the volume of the battery cell 100 ; Or the first heat exchange part 4 is lower than the outer surface of the first side wall 12 outside the concave part 121; or the first heat exchange part 4 is higher than the outer surface of the first side wall 12 outside the concave part 121 to enhance heat exchange Effect. In the third direction z, the third direction z is perpendicular to the first direction x and the second direction y, and the size of the first heat exchange part 4 can be consistent with the size of the shell 1 to enhance the heat exchange effect.

This embodiment can make full use of the space of the recessed part 121, increase the size of the first heat exchange part 4 along the first direction x as much as possible, so as to improve the effect of heat exchange between the first heat exchange part 4 and the electrode assembly 3, and improve the efficiency of the battery unit. The working performance of body 100.

In some embodiments, the casing 1 has a second side wall 13, and the second side wall 13 is disposed opposite to the opening 11. The battery cell 100 further includes a second heat exchanging portion 5, and the second heat exchanging portion 5 is disposed on the second Outside the side wall 13 is configured to exchange heat with the casing 1 .

Wherein, if the opening 11 is disposed toward the first direction x, the second side wall 13 is perpendicular to the first direction x. The second heat exchange part 5 is provided outside the second side wall 13 to regulate the temperature of the electrode assembly 3 by exchanging heat with the casing 1 . The second heat exchange part 5 and the second side wall 13 may be in contact or have a gap, and the second heat exchange part 5 may adopt a plate-shaped structure, which may adopt the heat exchange form of the first heat exchange part 4 .

In this embodiment, the second heat exchange part 5 is provided outside the second side wall 13 opposite to the opening 11, which can play a heat exchange function together with the first heat exchange part 4, can increase the heat exchange area, thereby improving heat exchange efficiency, and The temperature of each area inside the electrode assembly 3 is made more uniform, and the working performance of the battery cell 100 is improved. Moreover, when a plurality of battery cells 100 form the battery module 200, the second side wall 13 is generally not bonded to other battery cells 100, so the influence of setting the second heat exchange part 5 on the grouping of the battery cells 100 can be reduced. .

In some embodiments, the opening 11 is arranged toward the first direction x, the concave portion 121 is arranged at one end close to the second side wall 13 along the first direction x, and the end of the second heat exchange part 5 along the second direction y extends to Contact with the first heat exchange part 4 .

Wherein, the recessed part 121 is provided at one end close to the second side wall 13 along the first direction x, so that part of the side wall of the recessed part 121 is opened, and the end of the second heat exchange part 5 along the second direction y exchanges heat with the first part 4 abutting, the first heat exchange part 4 and the second heat exchange part 5 can be in a connected state, such as bonding, welding or fasteners, so that at least one first heat exchange part 4 and the second heat exchange part 4 The heat exchanging components composed of the heat exchanging part 5 can be installed as a whole, which reduces the difficulty of assembly. Optionally, there may also be a preset distance between the end of the second heat exchange part 5 along the second direction y and the first heat exchange part 4 .

In this embodiment, by making the end of the second heat exchange part 5 along the second direction y contact the first heat exchange part 4, the extension length of the second heat exchange part 5 can be increased to improve the heat exchange effect, and it can balance The temperature of the second heat exchange part 5 and the first heat exchange part 4 further improves the uniformity of the internal temperature of the electrode assembly 3 . In addition, if the second heat exchange part 5 and the first heat exchange part 4 adopt fluid heat exchange, the fluid supply or recovery parts can be shared to simplify the structure.

In some embodiments, the casing 1 has two first side walls 12 oppositely arranged, and the first heat exchange part 4 and the second heat exchange part 5 are arranged in the concave part 121 of each first side wall 12 . It is integrally formed with the two first heat exchange parts 4 .

This embodiment can simplify the structure of the heat exchange components, easily ensure the installation and fit accuracy between the second heat exchange part 5 and the two first heat exchange parts 4 and the battery cell 100, and can improve the assembly efficiency of the battery cell 100 .

In some embodiments, as shown in FIGS. 3 to 6 , the opening 11 is disposed toward the first direction x, and the electrode assembly 3 further includes a main body 31 and two kinds of tabs 32 with opposite polarities. The two directions y are drawn from both ends of the main body 31 respectively, the second direction y is perpendicular to the first direction x, and the tab 32 and the concave portion 121 on the same side are staggered along the first direction x. In order to provide the first heat exchange portion 4 , the tab 32 can be drawn out from the middle area of the main body portion 31 along the first direction x.

The battery cell 100 also includes an end cap assembly 2 and two adapters 6 , the end cap assembly 2 is configured to close the opening 11 , and includes an end cap body 21 and two electrodes with opposite polarities arranged on the end cap body 21 The terminal 22 and the adapter 6 are configured to electrically connect the tab 32 on the same side along the second direction y with the electrode terminal 22 . The tab 32 is electrically connected to the adapter 6 after being bent.

In this embodiment, the tab 32 is led out from the end of the main body 31 along the second direction y, and is set staggered with the concave portion 121 on the same side along the first direction x, so that the tab 32 can be drawn from the first side wall 12 and the main body. The area between the parts 31 outside the recessed part 121 is drawn out. In the first direction x, the distance between the main part 31 and the part of the first side wall 12 outside the recessed part 121 is greater than the distance between the main part 31 and the recessed part 121. Therefore, the tab 32 can make full use of the space in this area, and the first heat exchange part 4 can be set in the area where the concave part 121 is located, so that the y-size of the battery cell 100 along the second direction does not increase. Improve the heat exchange effect.

Moreover, since the first heat exchange part 4 is opposite to the side end of the pole piece of the main body part 31 along the second direction y, that is, it is opposite to the end part of the main body part 31 for immersing in the electrolyte, the first heat exchange part 4 can make the The multi-layer pole pieces exchange heat at the same time, which can increase the heat exchange speed. In addition, the first heat exchange part 4 can simultaneously exchange heat between the side end of the main body part 31 and the adapter part 6 .

In some embodiments, the adapter 6 includes a first portion 61 and a second portion 62 connected at an angle, the first portion 61 is connected to the tab 32 , and the second portion 62 is connected to the electrode terminal 22 . For example, the first part 61 and the second part 62 may be arranged vertically. The first portion 61 can be located between the main body 31 and the first side wall 12 , and the second portion 62 can be located between the main body 31 and the end cap assembly 2 . Wherein, the tab 32 can be bent from the end of the first portion 61 along the third direction z to a side of the first portion 61 away from the main body 31 .

In this embodiment, the connection between the tab 32 and the electrode terminal 22 can be realized conveniently through the bent adapter 6 .

In the first embodiment, as shown in FIG. 4 , the free end of the first part 61 exceeds the end of the tab 32 along the first direction x, and there is a gap between the inner wall of the concave part 121 and the opposite inner wall of the first part 61. The first preset gap L1.

Wherein, there is a second preset gap L2 between the main body portion 31 and the inner wall of the concave portion 121 along the second direction y. For example, the concave depth of the concave part 121 can be set to [1mm, 10mm], preferably [2mm, 5mm], the length of the concave part 121 along the first direction x is h, the dimension of the battery cell 100 along the first direction is H, h∈[1,80mm] or h≈(1/3-2/3)H. The first preset gap L1∈[0,10mm], the smaller the value, the better the heat transfer effect of the adapter 6, and the smaller the value of L2∈[0,10mm], the better the heat transfer effect of the electrode assembly 3 good.

In this embodiment, the free end of the first part 61 can exceed the end of the tab 32 and be as close to the first heat exchange part 4 as possible, so as to facilitate rapid heat exchange for the adapter 6, and the main part 31 is opposite to the recessed part 121 The part of the first heat exchange part 4 can also quickly exchange heat through the first heat exchange part 4, which can improve the heat exchange efficiency of the electrode assembly 3; The first preset gap L1 can prevent the free end of the first part 61 from being deformed due to collision and interference with the housing 1 due to assembly errors.

In the second embodiment, as shown in FIG. 5, on the basis of the first embodiment shown in FIG. One end of the second part 62 , and the third part 63 is located between the main part 31 and the concave part 121 .

Wherein, the third portion 63 is offset relative to the first portion 61 along the second direction y toward the side close to the main body portion 31 , and forms a bent structure at the joint, and the joint between the first portion 61 and the third portion 63 is located at The end of the tab 32 along the first direction x. The extension length of the third portion 63 along the first direction x may not exceed the end portion of the main body portion 31 . The third part 63 can be in contact with the main body part 31 to improve the firmness and stability of the installation of the adapter 6 and prevent the third part 63 from interfering with the housing 1 during assembly. The gap between the third part 63 and the inner wall of the concave part 121 can be designed to be [0, 5mm], the smaller the gap, the better the heat exchange effect. Optionally, there may also be a gap between the third portion 63 and the main body portion 31 .

In this embodiment, the heat exchange area between the adapter 6 and the first heat exchange portion 4 can be increased by making the adapter 6 further bend and extend to the area where the first heat exchange portion 4 is located after being connected to the tab 32 , so that the adapter 6 can conduct heat exchange through two adjacent side surfaces of the first heat exchange part 4 at the same time, so that the rapid heat conduction of the adapter 6 can be realized and the heat exchange efficiency can be improved. During the working process of the battery cell 100 , it is possible to prevent the temperature of the adapter 6 from being too high due to concentrated heating or overcurrent, thereby improving the performance, reliability and safety of the battery cell 100 .

In the third embodiment, as shown in FIG. 6 , the free end of the first portion 61 does not exceed the end of the tab 32 along the first direction x.

In this embodiment, the free end of the first part 61 does not exceed the end of the tab 32 along the first direction x, so that the tab 32 can be closer to the first heat exchange part 4 to facilitate rapid heat conduction, and the main part 31 does not Covered by the adapter piece 6 , the rapid heat exchange of the main body 31 can be realized, so the overall heat exchange efficiency of the electrode assembly 3 can be improved.

For the first, second and third embodiments, the electrode assembly 3 can adopt two structural forms.

First, as shown in FIG. 7 , the electrode assembly 3 has a winding structure, and the winding axis K of the electrode assembly 3 is arranged along the second direction y. end separately. The electrode assembly 3 has a flat surface 36 arranged perpendicular to a third direction z, which is perpendicular to the first direction x and the second direction y.

Specifically, the electrode assembly 3 also has an arc surface 37, the outer surface of which has two flat surfaces 36 and two arc surfaces 37, the two flat surfaces 36 are arranged parallel to each other along the third direction z, and the flat surfaces 36 are approximately parallel to The outer surface that wraps around the axis K and is the largest in area. The flat surface 36 can be a relatively flat surface and does not need to be a pure plane. One of the arc surfaces 37 is connected to respective first ends of the two flat surfaces 36 , and the other arc surface 37 is connected to respective second ends of the two flat surfaces. When making the electrode assembly 3 , the electrode assembly 3 can be directly wound into a flat shape, or first wound into a hollow cylindrical structure, and then flattened into a flat shape after winding.

The electrode assembly 3 is formed by winding a first pole piece 33, a second pole piece 34 and a diaphragm 35 with opposite polarities. Diode pieces 34 are spaced apart. The shapes of the first pole piece 33 and the second pole piece 34 are basically the same, and may be a strip-shaped structure. After winding, the main body portion 31 can be a cylinder, a flat body, a cuboid or other shapes. For example, the first pole piece 33 can be a positive pole piece, and the second pole piece 34 can be a negative pole piece; or the first pole piece 33 can be a negative pole piece, and the second pole piece 34 can be a positive pole piece.

This embodiment adopts the wound electrode assembly 3, which is easy to implement mechanized processing and assembly, and the uniformity is more guaranteed, which is beneficial to mass production.

Second, as shown in FIG. 8 , the electrode assembly 3 has a winding structure, and the electrode assembly 3 has a laminated structure. The electrode assembly 3 has a first pole piece 33 and a second pole piece with opposite polarities and superimposed along the third direction z. Sheet 34, the third direction z is perpendicular to the first direction x and the second direction y.

Specifically, the electrode assembly 3 is stacked along the third direction z through the first pole piece 33, the second pole piece 34 and the diaphragm 35, the first pole piece 33 and the second pole piece 34 are arranged alternately, and the diaphragm 35 connects the first pole piece The piece 33 and the second pole piece 34 are spaced apart.

This embodiment adopts the laminated electrode assembly 3, and the size setting is relatively flexible. The first pole piece 33 and the second pole piece 34 can be cut into a rectangular structure, which can better occupy the space in the housing 1 and improve the battery capacity. 100 energy density. Moreover, for the structure in which the first heat exchange part 4 is respectively provided on two opposite first side walls 12, and the second heat exchange part 5 is provided on the second side wall 13 opposite to the opening 11, the two second heat exchange parts Both the first heat exchange part 4 and the second heat exchange part 5 are opposite to the side ends of the pole pieces of the electrode assembly 3. Compared with the wound electrode assembly 3, the three end faces of the electrode assembly 3 can be quickly heat exchanged at the same time. Improve heat transfer efficiency.

In some embodiments, as shown in FIG. 9 and FIG. 10 , the battery cell 100 further includes an end cap assembly 2 for closing the opening 11, the opening 11 is disposed facing the first direction x, and the electrode assembly 3 further includes a main body 31 and Two kinds of tabs 32 with opposite polarities, the tabs 32 are led out from the side end of the main body 31 along the first direction x toward the end cover assembly 2 .

Wherein, the casing 1 is provided with an opening 11, and the two kinds of tabs 32 can be led out from the same side end of the main body 31 toward the end cover assembly 2; or the two ends of the casing 1 along the first direction x are respectively provided with openings 11, Each opening 11 is closed by the end cap assembly 2 , and two kinds of tabs 32 can be led out from both ends of the main body 31 toward the corresponding end cap assembly 2 .

This embodiment is convenient for electrically connecting the tab 32 with the electrode terminal 22, and can save the space occupied by the tab 32 and the adapter 6 on both sides of the main body 31 along the second direction y, which is beneficial to increase the first heat exchange part 4 The size along the first direction x can meet the larger heat transfer requirement of the battery cell 100 . Moreover, this structure can make the electrolyte solution evenly infiltrate the end of the electrode assembly 3 , make each position of the pole piece conduct electricity uniformly, and improve the performance of the battery cell 100 .

In the fourth embodiment, as shown in FIG. 9 , the main body portion 31 has the same width along the first direction x.

In this embodiment, the part of the electrode assembly 3 opposite to the concave portion 121 can realize rapid heat exchange, so as to improve the efficiency of temperature adjustment of the electrode assembly 3, and the electrode assembly 3 and the first side wall 12 are located between the area outside the concave portion 121 The gap between them increases, increasing the residual space inside the battery cell 100. For example, the extra space can be used to increase the filling capacity of the electrolyte to ensure that the battery cell 100 still has enough electrolyte after long-term use; or the extra space can be used to accommodate the gas generated during use to reduce the end cap body. The cracking pressure of the pressure relief component arranged on the 21 improves the service life of the battery cell 100 .

In the fifth embodiment, the main body 31 is divided into a first sub-section 311 and a second sub-section 312 along the first direction x, and the end of the first sub-section 311 along the second direction y exceeds the end of the second sub-section 312 to form a step 313 at the junction of the first sub-section 311 and the second sub-section 312, and the end of the first sub-section 311 extends along the second direction y to exceed the inner wall of the concave portion 121 opposite to the main body portion 31; wherein , the second direction y is perpendicular to the first direction x.

Wherein, both ends of the first sub-section 311 along the second direction y can exceed the ends of the second sub-section 312 , so that the main body 31 forms steps 313 at both ends along the second direction y. This kind of structure is more suitable for the electrode assembly 3 of the lamination structure, and the pole piece can be cut into a special shape conveniently.

In this embodiment, the step 313 is provided at the end of the main body 31 along the second direction y, so that the first sub-section 311 can fully occupy the space formed by the first side wall 12 in the area other than the concave portion 121, which can be used for setting the second sub-section. A space is reserved for the heat exchange part 4 , which can increase the energy density of the battery cell 100 .

For the fourth and fifth embodiments, the electrode assembly 3 can adopt two structural forms.

First, the electrode assembly 3 is a winding structure, and the winding axis K of the electrode assembly 3 is arranged along the first direction x, the electrode assembly 3 has a flat surface 36, and the flat surface 36 is arranged perpendicular to the third direction z, and the first side wall 12 is located on the side of the main body 31 along the second direction y, and the third direction z is perpendicular to the first direction x and the second direction y.

Second, the electrode assembly 3 is a stacked structure, and the electrode assembly 3 has a first pole piece 33 and a second pole piece 34 with opposite polarities and superimposed along the third direction z; wherein, the first side wall 12 is along the second direction y Located on the side of the main body 31 , the third direction z is perpendicular to the first direction x and the second direction y.

On the basis of the battery cell 100 described above, the structure of the battery module 200 of the present application will be described below.

In some embodiments, the battery module 200 includes the battery cells 100 of the above-mentioned embodiments. This kind of battery module 200 can exchange heat with the corresponding electrode assemblies 3 through a plurality of first heat exchange parts 4 to achieve a better temperature regulation effect, improve the response speed of temperature regulation, and make the active materials in each electrode assembly 3 operate at a suitable temperature. Working under high temperature to give full play to the performance, such as improving the discharge performance to achieve better performance parameters, or increasing the fast charging rate, can also improve the working reliability and safety of the battery module 200 .

In some embodiments, as shown in FIG. 11 and FIG. 12 , the opening 11 is arranged toward the first direction x, and the plurality of battery cells 100 are divided into groups of sub-modules 200 along the second direction y, and the second direction y is perpendicular to the first direction x. In one direction x, the recessed parts 121 of the two battery cells 100 arranged along the second direction y in two adjacent groups of sub-modules 200 are arranged oppositely, and the two first heat exchange parts 4 in the two recessed parts 121 are integrally arranged .

Wherein, in the second direction y, two adjacent battery cells 100 can be connected by an adhesive, which can balance the temperature among multiple battery cells 100, prevent battery cells 100 with excessive temperature, and improve The working reliability and safety are improved, and the overall rigidity of the battery module 200 can also be improved. The number of groups of sub-modules 200 can be n, n∈[2,10], preferably [3,5].

In this embodiment, by integrally arranging the two first heat exchange parts 4 in two adjacent recessed parts 121, the difficulty of the overall structure of the heat exchange parts can be reduced, the assembly is easy, and the assembly efficiency can be improved when the battery cells 100 are grouped. and can increase the width of the first heat exchange part 4 along the second direction y, which is convenient for setting fluid passages in the first heat exchange part 4, and can optimize the heat exchange effect.

In some embodiments, the casing 1 has a second side wall 13, and the second side wall 13 is disposed opposite to the opening 11. The battery cell 100 further includes a second heat exchanging portion 5, and the second heat exchanging portion 5 is disposed on the second Outside the side wall 13 , the second heat exchange parts 5 of the plurality of battery cells 100 arranged along the second direction y are integrated with the first heat exchange parts 4 . For example, the second heat exchange parts 5 corresponding to a plurality of battery cells are arranged as a whole plate-shaped structure, which is arranged perpendicular to the first direction x, and the plurality of first heat exchange parts 4 are connected to the overall second heat exchange part 5. A heat exchange part 4 can also be a plate-like structure extending along the first direction x.

Wherein, each sub-module 200 can arrange a plurality of battery cells 100 side by side along the third direction z, adjacent battery cells 100 are attached to the largest sides perpendicular to the third direction z, and the third direction z is perpendicular to the electrode assembly 3 In the thickness direction, for the electrode assembly 3 of the winding structure, the third direction z is perpendicular to the flat plane 36; for the electrode assembly 3 of the laminated structure, the third direction z is perpendicular to the stacking of the first pole piece 33 and the second pole piece 34 direction. By arranging the first heat exchanging parts 4 on the first side walls 12 opposite to the second direction y, and disposing the second heat exchanging parts 5 on the second side walls 13 opposite to the opening 11, the battery module 200 can be improved. The heat exchange efficiency is high, and the overall size is not increased when the battery cells 100 are assembled into the battery module 200 .

In this embodiment, the second heat exchange part 5 corresponding to each battery cell 100 in the battery module 200 is set as an integral structure, and a plurality of first heat exchange parts 4 are integrally connected to the integral second heat exchange part 5, which can It reduces the difficulty of assembling the heat exchange component and each battery cell 100 , and makes it easy to form the battery module 200 ; moreover, the cooling of multiple battery cells 100 can be realized simultaneously through the integral heat exchange component.

In some embodiments, as shown in FIG. 11 , the outermost first heat exchange portion 4 along the second direction y exceeds the first side wall 12 . This kind of structure is easy to set all the first heat exchange parts 4 in the form of equal width, which can reduce the processing technology, and can increase the heat exchange capacity of the outermost first heat exchange part 4 . For example, when cooling is required, more heat can be taken away through the outermost first heat exchange portion 4 .

In some embodiments, as shown in FIG. 12 , the outermost first heat exchange portion 4 along the second direction y is flush with the first side wall 12 . The outermost first heat exchange part 4 of this structure does not protrude and take up extra space, is easy to install, and improves the compactness of the space layout.

Secondly, the present application also provides a method for manufacturing a battery cell 100. In some embodiments, as shown in FIG. 13 , the manufacturing method includes:

S110. Housing providing step: providing a housing 1, the housing 1 is provided with an opening 11, and the housing 1 has a first side wall 12 adjacent to the opening 11, and the first side wall 12 is provided with a recessed portion 121;

S120, electrode placing step: setting the electrode assembly 3 in the housing 1;

S130 , the step of installing the heat exchange part: disposing the first heat exchange part 4 outside the first side wall 12 and inside the concave part 121 , so as to exchange heat with the housing 1 .

Finally, the present application provides a manufacturing equipment 500 of a battery cell 100. In some embodiments, as shown in FIG. 530. in:

The housing providing device 510 is configured to provide the housing 1 , the housing 1 is provided with an opening 11 , and the housing 1 has a first side wall 12 adjacent to the opening 11 , and a concave portion 121 is formed on the first side wall 12 . The electrode placement device 520 is configured to place the electrode assembly 3 in the casing 1 . The heat exchange part installation device 530 is configured such that the first heat exchange part 4 is disposed outside the first side wall 12 and located in the recessed part 121 to exchange heat with the housing 1 .

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (24)

A battery cell (100), comprising: The housing (1) is provided with an opening (11), the housing (1) has a first side wall (12) adjacent to the opening (11), and the first side wall (12) is provided with Recess (121); an electrode assembly (3), disposed within said casing (1); and The first heat exchange part (4), which is arranged outside the first side wall (12) and located in the recessed part (121), is configured to exchange heat with the casing (1). The battery cell (100) according to claim 1, wherein the casing (1) has two first side walls (12) oppositely arranged, and each of the first side walls (12 ) are provided with the first heat exchange portion (4) in the concave portion (121). The battery cell (100) according to claim 1 or 2, wherein, the casing (1) has a second side wall (13), the opening (11) is arranged facing the first direction (x), and the The second side wall (13) is arranged opposite to the opening (11), and in the first direction (x), the first side end of the first heat exchange part (4) abuts against the concave The outer side wall of the inlet part (121), the second side end of the first heat exchange part (4) is not lower than the second side wall (13). The battery cell (100) according to any one of claims 1-3, wherein, the casing (1) has a second side wall (13), and the second side wall (13) is connected to the opening (11) Relatively arranged, the battery cell (100) further includes a second heat exchange part (5), and the second heat exchange part (5) is arranged outside the second side wall (13) and configured In order to exchange heat with the shell (1). The battery cell (100) according to claim 4, wherein, the opening (11) is arranged facing the first direction (x), and the concave portion (121) is arranged near the first direction (x) One end of the second side wall (13), the end of the second heat exchange portion (5) along the second direction (y) extends to abut against the first heat exchange portion (4). The battery cell (100) according to claim 5, wherein the casing (1) has two first side walls (12) oppositely arranged, and each of the first side walls (12 ) are provided with the first heat exchange portion (4) in the concave portion (121), and the second heat exchange portion (5) is integrally formed with the two first heat exchange portions (4). The battery cell (100) according to any one of claims 1 to 6, wherein the opening (11) is arranged facing the first direction (x), and the electrode assembly (3) further includes a main body (31) Two kinds of tabs (32) opposite in polarity, the two kinds of tabs (32) respectively lead out from both ends of the main body part (31) along the second direction (y), and the second direction (y) ) is perpendicular to the first direction (x), and the tab (32) and the concave portion (121) on the same side are staggered along the first direction (x); The battery cell (100) further includes an end cap assembly (2) and two adapters (6), the end cap assembly (2) is configured to close the opening (11) and includes an end cap body (21) As for the two kinds of electrode terminals (22) with opposite polarities provided on the end cap body (21), the adapter (6) is configured to connect all electrodes on the same side along the second direction (y). The tab (32) is electrically connected to the electrode terminal (22). The battery cell (100) according to claim 7, wherein the adapter (6) comprises a first part (61) and a second part (62) connected at an angle, and the first part (61 ) is connected to the tab (32), and the second part (62) is connected to the electrode terminal (22). The battery cell (100) according to claim 8, wherein the free end of the first part (61) exceeds the end of the tab (32) along the first direction (x), and There is a first preset gap L1 between the inner side wall of the concave portion (121) and the first portion (61) opposite to each other. The battery cell (100) according to claim 8 or 9, wherein the adapter (6) further comprises a third part (63), the third part (63) is connected to the second part (62) An end away from the first portion (61), and the third portion (63) is located between the main body portion (31) and the recessed portion (121). The battery cell (100) according to Claim 8, wherein the free end of the first portion (61) does not exceed the end of the tab (32) along the first direction (x). The battery cell (100) according to any one of claims 7 to 11, wherein, The electrode assembly (3) has a winding structure, and the winding axis (K) of the electrode assembly (3) is arranged along the second direction (y), and the electrode assembly (3) has a flat surface (36 ), said flat surface (36) is arranged perpendicular to a third direction (z), said third direction (z) being perpendicular to said first direction (x) and said second direction (y); and/or The electrode assembly (3) has a laminated structure, the electrode assembly (3) has a first pole piece (33) and a second pole piece (34) with opposite polarities and superimposed along the third direction (z), so The third direction (z) is perpendicular to the first direction (x) and the second direction (y). The battery cell (100) according to any one of claims 1 to 6, further comprising an end cover assembly (2) for closing the opening (11), and the opening (11) faces the first direction (x) setting, the electrode assembly (3) also includes a main body (31) and two kinds of tabs (32) with opposite polarities, and the tabs (32) start from the side ends of the main body (31) Leading out towards the end cover assembly (2) along the first direction (x). The battery cell (100) according to claim 13, wherein the main body portion (31) is of equal width along the first direction (x). The battery cell (100) according to claim 13, wherein the main body (31) is divided into a first subsection (311) and a second subsection (312) along the first direction (x), The end of the first subsection (311) along the second direction (y) exceeds the end of the second subsection (312), so that the first subsection (311) and the second subsection The junction of the part (312) forms a step (313), and the end of the first sub-part (311) extends along the second direction (y) beyond the recessed part (121) and the main part ( 31) Opposite inner walls; wherein said second direction (y) is perpendicular to said first direction (x). The battery cell (100) according to any one of claims 13 to 15, wherein the electrode assembly (3) is a winding structure, and the winding axis (K) of the electrode assembly (3) is along the The first direction (x) is arranged, the electrode assembly (3) has a flat surface (36), and the flat surface (36) is arranged perpendicular to the third direction (z); and/or The electrode assembly (3) has a stacked structure, and the electrode assembly (3) has a first pole piece (33) and a second pole piece (34) with opposite polarities and stacked along the third direction (z); Wherein, the first side wall (12) is located on the side of the main body (31) along the second direction (y), and the third direction (z) is perpendicular to the first direction (x) and the Second direction (y). A battery module (200), comprising: a plurality of battery cells (100) according to any one of claims 1 to 16. The battery module (200) according to claim 17, wherein the opening (11) is arranged towards the first direction (x), and the plurality of battery cells (100) are divided into multiple parts along the second direction (y). A group of submodules (200), the second direction (y) is perpendicular to the first direction (x), and two adjacent groups of submodules (200) arranged along the second direction (y) The recessed parts (121) of the battery cells (100) are arranged oppositely, and the two first heat exchange parts (4) in the two recessed parts (121) are integrally arranged. The battery module (200) according to claim 18, wherein the casing (1) has a second side wall (13), and the second side wall (13) is arranged opposite to the opening (11), The battery cell (100) further includes a second heat exchange portion (5), and the second heat exchange portion (5) is disposed outside the second side wall (13) along the second direction (y ) The second heat exchange parts (5) of the plurality of battery cells (100) provided in ) are integrally provided with the first heat exchange parts (4). The battery module (200) according to claim 18 or 19, wherein the first heat exchanging portion (4) located on the outermost side along the second direction (y) is connected to the first side wall (12) flush with or beyond said first side wall (12). A battery (300), comprising the battery cell (100) according to any one of claims 1 to 17, and/or the battery module (200) according to any one of claims 17 to 20. An electrical device, comprising: The battery cell (100) according to any one of claims 1 to 16, and/or The battery module (200) according to any one of claims 17 to 20, and/or The battery (300) of claim 21. A method for manufacturing a battery cell (100), comprising: The casing providing step: providing a casing (1), the casing (1) is provided with an opening (11), and the casing (1) has a first side wall (12) adjacent to the opening (11) ), the first side wall (12) is provided with a concave portion (121); Electrode placement step: setting the electrode assembly (3) in the casing (1); The step of installing the heat exchange part: arranging the first heat exchange part (4) outside the first side wall (12) and inside the recessed part (121), so as to exchange heat with the casing (1). A manufacturing device (500) for a battery cell (100), comprising: A casing providing device (510), configured to provide a casing (1), the casing (1) is provided with an opening (11), and the casing (1) has a a first side wall (12), the first side wall (12) is provided with a concave portion (121); an electrode placement device (520), configured to place the electrode assembly (3) in the housing (1); and The heat exchange part installation device (530), configured to place the first heat exchange part (4) outside the first side wall (12) and in the recessed part (121), so as to be compatible with the housing (1) Heat exchange.

Images