WO2024060194A1

WO2024060194A1 - Battery and electrical apparatus

Info

Publication number: WO2024060194A1
Application number: PCT/CN2022/120850
Authority: WO
Inventors: 张辰辰; 李星; 唐彧; 徐晨怡
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2024-03-28

Abstract

The present application relates to a battery and an electrical apparatus. The battery (100) comprises a plurality of battery cells (20). The plurality of battery cells (20) comprise first battery cells (31) and second battery cells (32) arranged in a first direction. Each first battery cell (31) comprises a first wall (311) and a second wall (312) provided opposite to one another in the first direction. Relative to the first wall (311), the second wall (312) is closer to the second battery cell (32). The maximum thickness of the second wall (312) is less than the maximum thickness of the first wall (311). The battery and the electrical apparatus provided in the present application can reduce expansion during a use process of the battery and improve the safety performance of the battery.

Description

Batteries and electrical devices

Technical field

This application relates to the field of battery technology, and in particular to batteries and electrical devices.

Background technique

Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

The battery includes a box and a plurality of battery cells. Each battery cell includes an electrode assembly and a case. The electrode assembly is accommodated in the case. During the charging and discharging process of the battery, the battery cells will bulge outward. In addition, a certain amount of gas will be produced due to charging and discharging inside the casing. These gases will also cause the expansion of the battery cells and affect the safety of the battery. performance.

Contents of the invention

In view of the above problems, this application provides a battery and a power device that can reduce battery expansion during use and improve battery safety performance.

In a first aspect, this application provides a battery, including:

A plurality of battery cells, the plurality of battery cells include a first battery cell and a second battery cell arranged in a first direction, and the first battery cell includes a first wall and a second wall arranged oppositely in the first direction. wall, the second wall is closer to the second battery cell relative to the first wall;

Wherein, the maximum thickness of the second wall is less than the maximum thickness of the first wall.

In the technical solution of the embodiment of the present application, during the battery cycle, both the first battery cell and the second battery cell will expand outward. Since they are arranged along the first direction, the first battery cell and the second battery cell will expand outward. The external expansion force will be more obvious. The first battery cell will generate an outward expansion force along the first direction inside the first battery cell. The expansion force includes a force F1 moving away from the second battery cell, and a force F1 moving toward the second battery cell. Force F2. When F1 acts on the first wall, it points from the inner wall surface of the first wall to the outer wall surface of the first wall; when F2 acts on the second wall, it points from the inner wall surface of the second wall to the outer wall surface of the first wall. The second battery cell will experience another outward expansion force in the first direction inside the second battery cell. The expansion force includes a force F3 moving away from the first battery cell, and a force F3 moving toward the first battery cell. The force of F4. Since the first battery cell and the second battery cell are arranged along the first direction, and the second wall is closer to the second battery cell than the first wall, because the force F4 is directed from the inside of the second battery cell. The forces of the first battery cell, the directions of the forces of F2 and F4 are exactly opposite. The force of F2 acting on the second wall, that is, the force directed from the inner wall surface of the second wall to the outer wall surface of the first wall, can be controlled by the second battery cell. The force F4 generated inside the monomer is balanced. However, there is no structure that can additionally balance the force F1 on the first wall, so the maximum thickness of the second wall is set to be smaller than the maximum thickness of the first wall, that is, the first wall is thickened compared to the second wall. , so that the first wall has a better binding effect on the expansion generated by force F1. Compared with the first wall, the second wall is thinned. The thinned wall thickness of the second wall can compensate for the thickened wall thickness of the first wall, reducing the overall thickness of the first battery cell after the first wall is thickened. The increased volume space occupied in the battery improves the overall energy density of the battery, reduces battery expansion during use, and improves battery safety performance while making the battery have a higher energy density.

In one embodiment, the second battery cell includes a third wall and a fourth wall arranged oppositely along the first direction, and relative to the third wall, the fourth wall is closer to the first battery cell;

Wherein, the maximum thickness of the fourth wall is less than the maximum thickness of the third wall. During the cycle of the battery, an outward expansion force is generated inside the second battery cell. The expansion force includes a force F3 moving away from the first battery cell, and a force F4 moving toward the first battery cell. The force F4 acting on the fourth wall can be balanced by the force F2 of the first battery cell, but the force F3 on the third wall does not have an additional balancing structure, so the maximum thickness of the fourth wall is set to be smaller than the third wall. The maximum thickness of the wall, that is, thickening the third wall, makes the third wall have a better restraint effect on the expansion generated by force F3. Compared with the third wall, the fourth wall is thinned. The thinned wall thickness of the fourth wall can compensate for the thickened wall thickness of the third wall, reducing the overall thickness of the second battery cell after the fourth wall is thickened. The increased volume space occupied in the battery improves the overall energy density of the battery, reduces battery expansion during use, and improves battery safety performance while making the battery have a higher energy density.

In one embodiment, the first direction is the thickness direction of the first battery cell and/or the second battery cell. The first battery cell and the second battery cell are arranged along the thickness direction of the first battery cell and/or the second battery cell, and the first wall and the second wall are large walls of the first battery cell, or The third wall and the fourth wall are the large walls of the second battery cell. During the use of the battery, the battery cells generate more expansion force on the large wall. At this time, the first wall or the third wall The thickening process has a better constraining expansion effect; or the first wall and the second wall are the large-area walls of the first battery cell, and the third wall and the fourth wall are the large-area walls of the second battery cell. wall, in this case, the first battery cell and the second battery cell are arranged flat, and the simultaneous thickening of the first wall and the third wall has a restraining and expansion effect.

In one embodiment, at least one of the first battery cell and the second battery cell includes an electrode assembly, and the first direction is a stacking direction of the electrode assembly. During the charging and discharging process of the battery, the insertion and extraction of lithium ions in the electrode active material will cause the expansion and contraction of the battery. In an ideal state, the volume change of the material during the insertion and extraction process should be reversible. However, in actual situations, , there is always a part of lithium ions that cannot be completely deintercalated from the anode due to changes in battery balance, or are deposited on the anode surface as insoluble by-products during the cycle, thereby causing expansion, and the expansion in the stacking direction is the most obvious, with the first wall Or the thickening of the third wall has a better binding expansion effect and reduces battery safety problems caused by expansion during battery use.

In one embodiment, the electrode assembly is a rolled electrode assembly and is flat. The electrode assembly includes a straight portion and a corner portion. The straight portion and the corner portion are connected to each other. The first direction is perpendicular to the stacking direction of the straight portion. . When the electrode assembly is a rolled electrode assembly, the first battery cells and the second battery cells are arranged in a stacking direction perpendicular to the straight portion, and the first wall and the third wall play a role in constraining expansion.

In some embodiments, the electrode assembly is a stacked electrode assembly. When the electrode assembly is a laminated electrode assembly, the internal resistance of the laminated electrode assembly is lower than that of the wound electrode assembly battery, the charging and discharging power of the laminated sheet is better, the utilization rate of the laminated sheet is high, and the area of the electrode sheet is large. Energy density increases.

In some embodiments, at least one of the first battery cell and the second battery cell includes at least two stacked electrode assemblies, and the first direction is a stacking direction of the at least two electrode assemblies. When the first direction is the stacking direction of at least two electrode assemblies, the expansion in the stacking direction is more obvious. The thickening of the first wall or the third wall has a better constraining expansion effect and effectively alleviates the stress between the first battery cell and the second battery cell. Safety problems caused by the expansion of at least one of the battery cells can reduce the expansion during battery use and improve battery safety performance.

In some embodiments, the first battery cell and the second battery cell are connected in direct contact through the second wall and the fourth wall. In the first direction, the first battery cell and the second battery cell are directly stacked. The battery contains at least two layers of battery cells arranged flat. Batteries arranged flat have a higher degree of integration and improve The space utilization of the battery reduces the overall thickness of the battery, saves space, and saves the use of insulation materials; the second wall and the fourth wall are in direct contact, and the contact surface between the second wall and the fourth wall is the first battery cell. The direct contact surface with the second battery cell, the second wall and the fourth wall are thinned to increase the energy density of the battery.

In one embodiment, the plurality of battery cells further includes a third battery cell, the third battery cell is located between the first battery cell and the second battery cell, and the third battery cell includes two battery cells facing each other along the first direction. The maximum thickness of at least one of the fifth wall and the sixth wall is smaller than the maximum thickness of at least one of the first wall and the third wall. When the battery has at least three battery cells, the third battery cell is located between the first battery cell and the second battery cell along the first direction, and the fifth wall and the sixth wall are close to each other as the third battery cell. The wall of the first battery cell or the second battery cell and the expansion force generated by the third battery cell from the inside to the outside in the first direction can be controlled by the force F2 of the first battery cell and the force F4 of the second battery cell. balance. Therefore, the maximum thickness of at least one of the fifth wall and the sixth wall is smaller than the maximum thickness of at least one of the first wall and the third wall, that is, at least one of the fifth wall and the sixth wall is made thinner. Processing can reduce the overall thickness and occupied space of the third battery cell, reduce the thickness of multiple battery cells in the first direction, and increase the energy density of the battery.

In one embodiment, the first battery cell includes a seventh wall. One end of the seventh wall is connected to the first wall and the other end is connected to the second wall. The maximum thickness of the seventh wall is less than the maximum thickness of the first wall and greater than the maximum thickness of the first wall. The maximum thickness of the second wall. Because the first battery cell and the second battery cell are arranged along the first direction, the battery has more expansion force in the first direction, but there are also expansion forces in other directions. The seventh wall has the function of constraining the first battery cell. The body expands and deforms, but its binding direction is perpendicular to the first direction, which improves the binding of the first battery cell, reduces the expansion of the battery during use, and improves the safety performance of the battery.

In some embodiments, the battery further includes at least one restraint;

Along the first direction, a restraint is provided on the side of the first battery cell away from the second battery cell, and/or, along the first direction, a restraint is provided on the side of the second battery cell away from the first battery cell. member, the first direction is configured as the thickness direction of the restraining member. The restraining member restrains the battery cell on the outside of the battery cell, restrains the expansion and deformation of the battery, and reduces battery safety problems caused by expansion during battery use.

In one embodiment, the battery includes a box, and the restraint is configured as at least one of a bottom plate or an upper cover of the box. As a part of the box, the bottom plate or the upper cover plays a role in constraining the battery cells in the battery structure when assembling the battery, making the battery structure more compact, restraining the expansion and deformation of the battery, and reducing the expansion caused by the battery during use. battery safety issues.

In one embodiment, the battery includes at least two battery cell groups, at least one of the at least two battery cell groups including a first battery cell and a second battery cell;

A partition is provided between two adjacent battery unit groups in at least two battery unit groups, and the bottom plate and the upper cover are connected to the partition. The separator plays a role in connecting the bottom plate and the upper cover, making the connection between the bottom plate and the upper cover stable, and improving the binding effect of the bottom plate and the upper cover in the battery; at the same time, the separator is placed between the two battery cell groups to It has a binding effect on the battery cell group. In addition, the separator has a certain thermal conductivity and heat dissipation effect, which prevents direct heat transfer between two adjacent battery cell groups, causing thermal failure of the battery, and ensures the safe and reliable use of the battery. Give full play to the battery's charge and discharge capabilities and extend the battery's service life.

In one embodiment, the battery cell stack includes a module housing, and the restraint is configured as one of an end plate, a side plate, or an end cap of the module housing. As a part of the module shell, the end plate, side plate or end cover plays a role in binding the battery cells in the battery cell group when assembling the battery cell group, so that the battery cell group The structure is more compact, restraining the expansion and deformation of the battery cell group, and reducing battery safety problems caused by expansion during battery use.

In one embodiment, the battery includes a box, and the restraints are configured as dividing beams of the box. As a part of the box, the dividing beam plays a role in restraining the battery cells in the battery structure when assembling the battery, making the battery structure more compact, restraining the expansion and deformation of the battery, and reducing battery expansion caused by battery use. Security Question.

In a battery module, at least part of the surface of the restraining member facing the first battery cell or the second battery cell is configured as a plane. The flat arrangement enables the binding member to have a better binding effect.

In a second aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy to the electrical device. Electrical devices have higher energy density, which improves the safety performance of electrical devices.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of the present application or the traditional technology, the drawings needed to be used in the description of the embodiments or the traditional technology will be briefly introduced below. Obviously, the drawings in the following description are only for the purpose of explaining the embodiments or the technical solutions of the traditional technology. For the embodiments of the application, those of ordinary skill in the art can also obtain other drawings based on the disclosed drawings without exerting creative efforts. In the attached picture:

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

Figure 2 is a schematic diagram of the exploded structure of a battery in some embodiments of the present application;

Figure 3 is a schematic diagram of the exploded structure of a battery cell in some embodiments of the present application;

Figure 4 is a schematic diagram of the exploded structure of the battery with two battery cells along the first direction in some embodiments of the present application; Figure 5 is a cross-sectional view of the battery with two battery cells along the first direction in some embodiments of the present application;

Figure 6 is a schematic diagram showing the stress on the walls of the first battery cell and the second battery cell in some embodiments of the present application;

Figure 7 is a cross-sectional view of a battery with three battery cells along a first direction in some embodiments of the present application;

Figure 8 is a cross-sectional view of a battery with two battery cell groups along the first direction in other embodiments of the present application;

Figure 9 is a schematic structural diagram of a separator of a battery in some embodiments of the present application.

The reference numbers in the specific implementation are as follows:

1000, vehicles;

100. Battery; 200. Controller; 300. Motor;

10. Box; 11. First part; 12. Second part; 121. Base plate; 20. Battery cell; 21. End cover; 21a. Electrode terminal; 22. Shell; 23. Battery core assembly; 231. Electrode Component; 30. Battery cell group; 31. First battery cell; 311. First wall; 312. Second wall; 313. Seventh wall; 32. Second battery cell; 321. Third wall; 322 , the fourth wall; 33. the third battery cell; 331. the fifth wall; 332. the sixth wall; 40. the dividing beam.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. 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.

The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and are therefore only used as examples and cannot be used to limit the protection scope of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the technical field belonging to this application; the terms used herein are for the purpose of describing specific embodiments only and are not intended to be used in Limitation of this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

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

In the description of the embodiments of this application, the term "and/or" is only an association relationship describing associated objects, indicating that there can be three relationships, such as A and/or B, which can mean: A exists alone, and A exists simultaneously and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In the description of the embodiments of this application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to It is more than two pieces (including two pieces).

In the description of the embodiments of this application, the technical terms "center", "length", "width", "thickness", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on The orientation or positional relationship shown in the drawings is only to facilitate the description of the embodiments of the present application and simplify 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 It should be understood as a limitation on the embodiments of this application.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "connection" and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

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 inventor noticed that as the positive active material and the negative active material embed or detach ions during the charge and discharge cycles of the battery, the battery core system expands due to side reaction accumulation thickness and graphite flake peeling. For the battery core, the internal pressure will increase, and the performance and life of the battery core will decrease; for the battery module, if the expansion force is not handled properly, the module size will be out of tolerance, and even the structural frame will be damaged, affecting the safety performance of the battery.

Based on the above considerations, in order to alleviate the problem of battery expansion during use and improve battery safety performance, the inventor has conducted in-depth research and designed a battery cell that can keep multiple battery cells away from each other when the batteries are grouped. The walls of the battery are thickened to improve the effect of constraining expansion, and the walls of multiple battery cells close to each other are thinned to increase the energy density of the battery.

In such a battery, since the wall thickness of the battery cells is set to unequal thickness, during the cycle of the battery cells, the thickened wall plays a role in increasing the restraint expansion, and the thinned wall can increase the energy density. A high-energy-density battery with high safety performance that has the effect of constraining the expansion and deformation of battery cells can be obtained, which can reduce battery expansion during use and improve battery safety performance.

In the context of the increasing demand for battery energy density, the battery cell of the present application can make full use of the wall thickness changes of the battery cell itself, and achieve a better binding effect without changing the overall occupied volume of the battery cell. .

The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical device, which is conducive to reducing battery expansion during use, improving battery safety, and improving battery performance stability and battery life.

Embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

For the convenience of explanation in the following embodiments, an electric device 1000 according to an embodiment of the present application is used as an example.

Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery 100 is disposed inside the vehicle 1000 , and 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 also can 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 .

Please refer to FIG. 2, which is a schematic diagram of the exploded structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 20 are 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 battery 100 can also be a plurality of battery cells 20 First, the battery modules are connected in series, parallel, or mixed to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 10 . The battery 100 may also include other structures. For example, the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells 20 .

Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.

Please refer to FIG. 3 , which is an exploded structural diagram of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. As shown in FIG. 3 , the battery cell 20 includes an end cover 21 , a housing 22 , a cell assembly 23 and other functional components.

The end cap 21 refers to a component that covers the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22 . The end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is less likely to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength and safety. Performance could also be improved. The end cap 21 may be provided with functional components such as electrode terminals 21a. The electrode terminal 21a can be used to electrically connect with the battery cell assembly 23 for outputting or inputting electric energy of the battery cell 20 . In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application. In some embodiments, an insulating member may also be provided inside the end cover 21 , and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cover 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

The shell 22 is a component used to cooperate with the end cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell assembly 23, electrolyte and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cover 21 at the opening. Without limitation, the end cover 21 and the shell 22 can also be integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cover 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the battery cell assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

The battery cell assembly 23 is a component in the battery cell 20 that undergoes electrochemical reactions. One or more battery core assemblies 23 may be contained within the housing 22 . The cell assembly 23 is mainly formed by winding or stacking positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets. The portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body of the cell assembly, and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material each constitute the tabs. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively located at both ends of the main body. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminal 21a to form a current loop.

According to some embodiments of the present application, please refer to Figure 4, and please further refer to Figures 4 to 9. Figure 4 is a schematic exploded structural view of the battery 100 with two battery cells 20 along the first direction according to some embodiments of the present application. Figure 5 is a cross-sectional view of the battery 100 with two battery cells 20 along the first direction according to some embodiments of the present application. Figure 6 is a cross-sectional view of the battery 100 embodying the first battery cell 31 and the second battery cell 31 according to some embodiments of the present application. A schematic diagram of the stress on the wall of the battery cell 32. Figure 7 is a cross-sectional view of the battery 100 with three battery cells 20 along the first direction according to other embodiments of the present application. Figure 8 is a cross-sectional view of the battery 100 according to other embodiments of the present application. The battery 100 has a schematic structural diagram of two battery cells 20 along a first direction. FIG. 9 is a schematic structural diagram of a separator of the battery 100 according to some embodiments of the present application. The present application provides a battery 100, which includes a plurality of battery cells 20. The plurality of battery cells 20 include a first battery cell 31 and a second battery cell 32 arranged in a first direction. The first battery cell 20 31 includes a first wall 311 and a second wall 312 oppositely arranged along a first direction. Relative to the first wall 311 , the second wall 312 is closer to the second battery cell 32 . The maximum thickness of the second wall 312 is smaller than the maximum thickness of the first wall 311 . As shown in Figure 4, the Y direction in the figure is the width direction of the battery cell 20, the X direction is the length direction of the battery cell 20, and the Z direction is the thickness direction of the battery cell 20.

Referring to FIG. 4, FIG. 5 and FIG. 6, in the technical solution of the embodiment of the present application, during the cycle of the battery 100, both the first battery cell 31 and the second battery cell 32 will expand outwards. Since the two are arranged along the first direction, the outward expansion force in the first direction will be more obvious. The first battery cell 31 will generate an outward expansion force in the first direction inside the first battery cell 31, and the expansion force includes a force F1 away from the second battery cell 32, and a force F2 approaching the second battery cell 32. When F1 acts on the first wall 311, it points from the inner wall surface of the first wall 311 to the outer wall surface of the first wall 311; when F2 acts on the second wall 312, it points from the inner wall surface of the second wall 312 to the outer wall surface of the first wall 311. The second battery cell 32 will generate another outward expansion force in the first direction inside the second battery cell 32, and the expansion force includes a force F3 away from the first battery cell 31, and a force F4 approaching the first battery cell 31. Since the first battery cell 31 and the second battery cell 32 are arranged in a first direction, and compared with the first wall 311, the second wall 312 is closer to the second battery cell 32, because the force F4 is directed from the inside of the second battery cell 32 to the first battery cell 31, the directions of the forces F2 and F4 are exactly opposite, and the force F2 acting on the second wall 312, that is, the force directed from the inner wall surface of the second wall 312 to the outer wall surface of the first wall 311, can be balanced by the force F4 generated inside the second battery cell 32. However, there is no structure that can additionally balance the force F1 on the first wall 311, so the maximum thickness of the second wall 312 is set to be less than the maximum thickness of the first wall 311, that is, compared with the second wall 312, the first wall 311 is thickened, so that the first wall 311 has a better restraining effect on the expansion caused by the force F1. Compared with the first wall 311, the second wall 312 is thinned. The thinned wall thickness of the second wall 312 can compensate for the thickened wall thickness of the first wall 311, reduce the overall increased volume space occupied by the first battery cell 31 in the battery 100 after the first wall 311 is thickened, and improve the overall energy density of the battery 100. While reducing the expansion of the battery 100 during use and improving the safety performance of the battery 100, the battery 100 has a higher energy density.

According to some embodiments of the present application, the maximum thickness of the first wall 311 is D1, the maximum thickness of the second wall 312 is D2, the maximum thickness of the seventh wall 313 is D3, and D1, D2 and D3 satisfy: 1:1:1 <D1:D3:D2≤8:3:2, D3 is 0.2 millimeter (mm)-4 mm. In some embodiments, D3 is 0.2mm-4mm, that is, the maximum thickness of the seventh wall 313 is 0.2mm-4mm. When the seventh wall 313 is the normal wall thickness of the battery cell 20, when the first wall 311 is thickened, the maximum thickness of the first wall 311 can be set to four times the normal wall thickness of the battery cell 20. When the wall 312 is thinned, the maximum thickness of the second wall 312 can be set to at least two-thirds of the conventional wall thickness of the battery cell 20 . Such restrictions can enable the battery cells 20 to have a better effect of constraining the expansion force and have a higher energy density while ensuring that the process is easy to process and the cost is moderate.

Referring to FIG. 8 , according to some embodiments of the present application, the wall thickness of the first wall 311 is set to be unequal thickness. The thickness of the first wall 311 gradually increases from the center of the first wall 311 toward the edge of the first wall 311, and the inner wall surface of the first wall 311 is configured as a concave arc surface structure. The thinnest part of the first wall 311 , that is, the minimum thickness of the first wall 311 is greater than the maximum thickness of the second wall 312 , and the first wall 311 still has the effect of restraining the expansion force. At the same time, after the inner wall surface of the first wall 311 is set into a concave arc surface structure, an expansion gap is left between the center of the first wall 311 and the built-in electrode assembly 231, which plays a certain expansion buffering role. It can be understood that, of course, the first wall 311 can also be provided with other non-equal thickness structures, such as the inner wall being wavy, etc., which will not be described again here.

Referring to FIG. 5 , according to some embodiments of the present application, the second battery cell 32 includes a third wall 321 and a fourth wall 322 oppositely disposed along the first direction. Relative to the third wall 321 , the fourth wall 322 is closer to the third wall 321 . One battery cell 31. The maximum thickness of the fourth wall 322 is smaller than the maximum thickness of the third wall 321 .

The first battery cells 31 and the second battery cells 32 are arranged along the first direction. The third wall 321 serves as a wall for the second battery cell 32 to be away from the first battery cell 31. The third wall 321 is smaller than the fourth wall. 322 is thickened so that the third wall 321 acts in the first direction to constrain the expansion of the first battery cell 31 and the second battery cell 32 during the cycle, and can constrain the second battery cell 32 The expansion deformation of the first battery cell 31 can also indirectly restrain the expansion deformation of the first battery cell 31; the fourth wall 322 serves as the wall of the second battery cell 32 close to the first battery cell 31, and the fourth wall 322 is set to a maximum thickness less than The maximum thickness of the third wall 321 is to thin the fourth wall 322. The thinned wall thickness of the fourth wall 322 can compensate for the thickened wall thickness of the third wall 321, reducing the second thickness after the fourth wall 322 is thickened. The overall volume space occupied by the battery cell 32 in the battery 100 is increased, which improves the overall energy density of the battery 100. While the battery 100 has a higher energy density, it can also reduce the safety of the battery 100 caused by the expansion of the battery 100 during use. question.

According to some embodiments of the present application, the first direction is a thickness direction of the first battery cell 31 and/or the second battery cell 32 .

The first battery cells 31 and the second battery cells 32 are arranged along the thickness direction of the first battery cells 31 and/or the second battery cells 32 , and the first wall 311 and the second wall 312 are the first battery cells 31 The large wall, or the third wall 321 and the fourth wall 322 are the large walls of the second battery cell 32. During the use of the battery 100, the battery cell 20 generates more expansion force on the large wall. , at this time, the thickening of the first wall 311 or the third wall 321 has a better effect of restraining the expansion force; or the first wall 311 and the second wall 312 are large-surface walls of the first battery cell 31 at the same time. , the third wall 321 and the fourth wall 322 are large walls of the second battery cell 32. In this case, the first battery cell 31 and the second battery cell 32 are arranged in a lying position. , the battery 100 is more likely to expand, and the simultaneous thickening of the first wall 311 and the third wall 321 has the effect of further restraining the expansion force.

According to some embodiments of the present application, at least one of the first battery cell 31 and the second battery cell 32 includes an electrode assembly 231, and the first direction is the stacking direction of the electrode assembly 231.

During the charging and discharging process of the battery 100, the insertion and extraction of lithium ions in the electrode active material will cause the expansion and contraction of the battery 100. In an ideal state, the volume change of the material during the insertion and extraction process should be reversible. However, in practice, Under such circumstances, there are always some lithium ions that cannot be completely deintercalated from the anode due to changes in the balance of the battery 100, or are deposited on the anode surface as insoluble by-products during the cycle, thereby causing expansion, and the expansion is most obvious in the stacking direction. The thickening of the first wall 311 or the third wall 321 has a better restraining expansion force effect, further reducing the safety issues of the battery 100 caused by expansion during use of the battery 100 .

According to some embodiments of the present application, the electrode assembly 231 is a rolled electrode assembly 231 and is flat. The electrode assembly 231 includes a straight part and a corner part. The straight part and the corner part are connected to each other. The first direction is perpendicular to the flat part. Straight part stacking direction.

When the electrode assembly 231 is a rolled electrode assembly 231, the first battery cells 31 and the second battery cells 32 are arranged in the stacking direction perpendicular to the straight portion, and the first wall 311 and the third wall 321 act as restraints. The effect of expansion force.

The winding process of the battery 100 is to roll up the cathode sheet, separator, anode sheet, and separator together. The winding structure is mostly used to make cylindrical or rectangular batteries 100. The process is relatively mature and the batch cost is low.

According to some embodiments of the present application, the electrode assembly 231 is a stacked electrode assembly 231 . When the electrode assembly 231 is a laminated electrode assembly 231, the internal resistance of the laminated electrode assembly 231 is lower than the wound electrode assembly 231 of the battery 100, the charging and discharging power of the laminated sheet is better, and the utilization rate of the laminated sheet is high. The pole piece area is large and the energy density is further improved.

According to some embodiments of the present application, at least one of the first battery cell 31 and the second battery cell 32 includes at least two stacked electrode assemblies 231 , and the first direction is the stacking direction of the at least two electrode assemblies 231 .

When the first direction is the stacking direction of at least two electrode assemblies 231, the expansion in the stacking direction is more obvious. The thickening of the first wall 311 or the third wall 321 has a better constraining expansion force effect and effectively alleviates the stress of the first battery cell. Safety problems caused by the expansion of at least one of the body 31 and the second battery 100 unit can further reduce the expansion of the battery 100 during use and improve the safety performance of the battery 100.

Referring to FIG. 5 , according to some embodiments of the present application, the first battery cell 31 and the second battery cell 32 are directly connected through the second wall 312 and the fourth wall 322 .

In the first direction, the first battery cell 31 and the second battery cell 32 are directly stacked. The battery 100 includes at least two layers of battery cells 20 arranged flatly. The battery 100 arranged flatly has a higher The degree of integration improves the space utilization of the battery 100, reduces the overall thickness of the battery 100, saves space, and also saves the use of insulation materials; the second wall 312 and the fourth wall 322 are in direct contact, and the second wall 312 and the fourth wall 312 are in direct contact with each other. The contact surface of the wall 322 is the direct contact surface between the first battery cell 31 and the second battery cell 32. The second wall 312 and the fourth wall 322 are thinned to further increase the energy density of the battery 100.

Referring to Figure 7, according to some embodiments of the present application, the plurality of battery cells 20 further include a third battery cell 33, and the third battery cell 33 is located between the first battery cell 31 and the second battery cell 32, The third battery cell 33 includes fifth walls 331 and sixth walls 332 that are oppositely arranged along the first direction. The maximum thickness of at least one of the fifth wall 331 and the sixth wall 332 is smaller than the first wall 311 and the third wall. The maximum thickness of at least one of 321.

When the battery 100 has at least three battery cells 20 , the third battery cell 33 is located between the first battery cell 31 and the second battery cell 32 along the first direction, and the fifth wall 331 and the sixth wall 332 As the third battery cell 33 is close to the wall of the first battery cell 31 or the second battery 100 cell, the expansion force generated by the third battery cell 33 from the inside to the outside along the first direction can be caused by the first battery cell 31 The force F2 of the second battery cell 32 is balanced with the force F4 of the second battery cell 32 . Therefore, the maximum thickness of at least one of the fifth wall 331 and the sixth wall 332 is smaller than the maximum thickness of at least one of the first wall 311 and the third wall 321 , that is, the maximum thickness of the fifth wall 331 and the sixth wall 332 is At least one of them can be thinned to reduce the overall thickness and occupied space of the third battery cell 33 , reduce the thickness of the plurality of battery cells 20 in the first direction, and further improve the energy density of the battery 100 .

Referring to Figure 4, according to some embodiments of the present application, the battery 100 further includes at least one restraint; along the first direction, a restraint is provided on the side of the first battery cell 31 away from the second battery cell 32, and/or , along the first direction, a restraining member is provided on the side of the second battery cell 32 away from the first battery cell 31 , and the first direction is configured as the thickness direction of the restraining member.

Referring to Figure 5, according to some embodiments of the present application, the first battery cell 31 includes a seventh wall 313, one end of the seventh wall 313 is connected to the first wall 311, and the other end is connected to the second wall 312, and the maximum thickness of the seventh wall 313 is less than the maximum thickness of the first wall 311 and greater than the maximum thickness of the second wall 312.

According to some embodiments of the present application, the seventh wall 313 is located at both ends of the first battery cell 31 in the length direction, and also has a certain binding effect. It can be understood that the second battery cell 32 may also have an eighth wall. One end of the eighth wall is connected to the third wall 321 and the other end is connected to the fourth wall 322. The maximum thickness of the eighth wall is smaller than that of the third wall 321. The maximum thickness is greater than the maximum thickness of the fourth wall 322 .

During the cycle of the battery, an outward expansion force is generated inside the second battery cell 32 . The expansion force includes a force F3 moving away from the first battery cell 31 and a force F4 moving toward the first battery cell 31 . The force F4 acting on the fourth wall 322 can be balanced by the force F2 of the first battery cell 31, but the force F3 exerted on the third wall 321 does not have an additional balancing structure, so the maximum thickness of the fourth wall 322 is set In order to be less than the maximum thickness of the third wall 321, the third wall 321 is thickened so that the third wall 321 has a better constraining effect on the expansion generated by the force F3. Compared with the third wall 321, the fourth wall 322 is thinned. The thinned wall thickness of the fourth wall 322 can compensate for the thickened wall thickness of the third wall 321, reducing the second thickness after the fourth wall 322 is thickened. The overall volume space occupied by the battery cell 32 in the battery 100 is increased, which improves the overall energy density of the battery 100, reduces the expansion of the battery 100 during use, improves the safety performance of the battery 100, and makes the battery 100 have a higher Energy Density.

The restraining member restrains the battery cell 20 outside the battery cell 20, further restraining the expansion and deformation of the battery 100, and further reducing the safety issues of the battery 100 caused by the expansion of the battery 100 during use.

According to some embodiments of the present application, the battery 100 includes a box 10 , and the restraint is configured as at least one of the bottom plate 121 or the upper cover of the box 10 .

The use of pressure plates and other structures is reduced, and the bottom plate 121 or the upper cover of the box 10 is directly used as a restraint. The bottom plate 121 or the upper cover is a part of the box 10. When the battery 100 is assembled, it plays a role in constraining the battery cells 20 in the battery 100 structure, making the battery 100 structure more compact and further constraining the expansion and deformation of the battery 100. , further reducing safety issues of the battery 100 caused by expansion of the battery 100 during use.

According to some embodiments of the present application, the battery 100 includes at least two battery cell groups 30, at least one of the at least two battery cell groups 30 includes a first battery cell 31 and a second battery cell 32; at least two A partition is provided between two adjacent battery unit groups 30 in the battery unit groups 30, and the bottom plate 121 and the upper cover are connected to the partition. The separator plays a role in connecting the bottom plate 121 and the top cover, making the connection between the bottom plate 121 and the top cover stable, and improving the binding effect of the bottom plate 121 and the top cover in the battery 100; at the same time, the separator is placed between the two battery cell groups. 30, it can further restrain the battery cell group 30. In addition, the separator has a certain thermal conductivity and heat dissipation effect to avoid direct heat transfer between the two adjacent battery cell groups 30, resulting in thermal failure of the battery 100. Ensure the safe and reliable use of the battery 100, fully utilize the charging and discharging capabilities of the battery 100, and extend the service life of the battery 100.

According to some embodiments of the present application, the battery cell pack 30 includes a module housing 22 and the restraint is configured as one of an end plate, a side plate, or an end cap 21 of the module housing 22 . The end plate, side plate or end cover 21 serves as a part of the module housing 22 and plays a role in binding the battery cells 20 in the battery cell group 30 when the battery cell group 30 is assembled. , making the structure of the battery cell group 30 more compact, restraining the expansion and deformation of the battery cell group 30, and further reducing the safety issues of the battery 100 caused by the expansion of the battery 100 during use.

9 , according to some embodiments of the present application, a battery 100 includes a box body 10 , and the restraining member is configured as a partition beam 40 of the box body 10 .

As a part of the box 10, the partition beam 40 plays a role in constraining the battery cells 20 in the battery 100 structure when assembling the battery 100, making the battery 100 structure more compact and further constraining the expansion and deformation of the battery 100. The safety issues of the battery 100 caused by the expansion of the battery 100 during use are reduced.

According to some embodiments of the present application, the partition beam 40 is provided with a cooling structure, the cooling structure includes a cold plate, the cold plate is provided with a cooling flow channel, and the cooling flow channel is connected with an external cooling circulation mechanism. The partition beam 40 is provided with an exhaust structure, and the battery cell 20 is provided with a pressure relief mechanism on a side close to the partition beam 40 . The exhaust structure includes an exhaust channel and an exhaust port. The exhaust channel passes through the partition beam 40 . The exhaust channel is provided with an exhaust outlet. The exhaust outlet is connected with the inner cavity of the box 10 . The exhaust hole is provided on the partition beam 40 . On the side wall, the exhaust hole is connected to the exhaust channel, and the pressure relief mechanism is directly opposite to the exhaust hole.

The partition beam 40 not only restrains the battery cells 20, but also has the functions of water cooling and exhaust. It integrates the water cooling plate, exhaust channel, intermediate structural beam and other components in the traditional technology to improve the overall performance of the battery 100. .

According to some embodiments of the present application, at least a portion of a surface of the tie member facing the first battery cell 31 or the second battery cell 32 is configured as a plane.

Referring to Figure 4, when the restraining member is the upper cover of the box 10, the bottom wall of the upper cover faces the first battery cell 31, and the bottom wall of the upper cover is configured as a plane. The arrangement of the plane makes the upper cover have a better restraining effect. .

According to some embodiments of the present application, the present application also provides an electrical device, which includes the battery 100 in the above embodiment. The battery 100 is used to provide electrical energy for the electrical device. The power-consuming device may be any of the aforementioned devices or systems using the battery 100 . Electrical devices have higher energy density, which improves the safety performance of electrical devices.

According to some embodiments of the present application, referring to Figures 4 and 5, the present application provides a battery 100. The battery 100 includes a box 10, and two battery cell groups 30 are provided in the box 10. Each battery cell Each group 30 includes a plurality of first battery cells 31 and second battery cells 32 . The first battery cells 31 and the second battery cells 32 are arranged in the thickness direction of the first battery cells 31 and the second battery cells 32 . Arranged, the first battery cell 31 and the second battery cell 32 are directly connected through the second wall 312 and the fourth wall 322 . The maximum thickness of the second wall 312 is less than the maximum thickness of the first wall 311 , the maximum thickness of the fourth wall 322 is less than the maximum thickness of the third wall 321 , and the maximum thickness of the first wall 311 is equal to the maximum thickness of the third wall 321 , The maximum thickness of the second wall 312 is equal to the maximum thickness of the fourth wall 322 . The upper cover and bottom plate 121 of the box 10 both serve as restraints. The partition beam 40 provided between the two battery cell groups 30 not only restrains the battery cells 20, but also has the functions of water cooling and exhaust.

In some embodiments of the battery 100 and the electrical device of the present application, the wall thickness of the battery cells 20 is set to unequal thickness, and the wall thickness of the walls where adjacent cells are far away from each other is thickened to play a binding role. , the wall thickness of adjacent cells close to each other is thinned to increase the energy density of the battery 100. Relying on the thick shell 22, the use of structures such as pressure plates can be reduced, and space utilization can be improved. At the same time, adjacent battery cells can be The thinning design of the contact surface casing 22 of the body 20 can quantitatively maintain the energy density of the battery core without loss, increase the power while meeting the reliability of use during the life cycle, and obtain a battery cell with the effect of constraining the expansion and deformation of the battery core. High energy density battery 100 with higher safety performance.

The above-described embodiments only express several implementation modes of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

A battery, including:

A plurality of battery cells (20), the plurality of battery cells (20) including a first battery cell (31) and a second battery cell (32) arranged in a first direction, the first battery The unit (31) includes a first wall (311) and a second wall (312) oppositely arranged along the first direction. The second wall (312) is closer to the first wall (311). The second battery cell (32);

Wherein, the maximum thickness of the second wall (312) is less than the maximum thickness of the first wall (311).
The battery according to any one of claims 1, wherein the second battery cell (32) includes a third wall (321) and a fourth wall (322) arranged oppositely along the first direction. On the third wall (321), the fourth wall (322) is closer to the first battery cell (31);

Wherein, the maximum thickness of the fourth wall (322) is less than the maximum thickness of the third wall (321).
The battery according to any one of claims 1-2, wherein the first direction is the thickness direction of the first battery cell (31) and/or the second battery cell (32).
The battery according to any one of claims 1 to 3, wherein at least one of the first battery cell (31) and the second battery cell (32) includes an electrode assembly (231), The first direction is the stacking direction of the electrode assembly (231).
The battery according to claim 4, wherein the electrode assembly (231) is a rolled electrode assembly (231) and is flat, and the electrode assembly (231) includes a straight part and a corner part, and the The straight portion and the corner portion are connected to each other, and the first direction is perpendicular to the stacking direction of the straight portion.
The battery according to claim 4, wherein the electrode assembly (231) is a laminated electrode assembly (231).
The battery according to any one of claims 1-3, wherein at least one of the first battery cell (31) and the second battery cell (32) includes at least two stacked electrodes assembly (231), the first direction is the stacking direction of the at least two electrode assemblies (231).
The battery according to any one of claims 1 to 7, wherein the first battery cell (31) and the second battery cell (32) pass through the second wall (312) and the The fourth wall (322) is a direct contact connection.
The battery according to any one of claims 1-7, wherein the plurality of battery cells (20) further includes a third battery cell (33), the third battery cell (33) is located at the Between the first battery cell (31) and the second battery cell (32), the third battery cell (33) includes a fifth wall (331) arranged oppositely along the first direction and A sixth wall (332), at least one of the fifth wall (331) and the sixth wall (332) has a maximum thickness smaller than the first wall (311) and the third wall (321) The maximum thickness of at least one of the
The battery according to claim 1, wherein the first battery cell (31) includes a seventh wall (313), one end of the seventh wall (313) is connected to the first wall (311), and the other end of the seventh wall (313) is connected to the first wall (311). One end is connected to the second wall (312), and the maximum thickness of the seventh wall (313) is less than the maximum thickness of the first wall (311) and greater than the maximum thickness of the second wall (312).
The battery according to any one of claims 1-10, wherein the battery (100) further includes at least one restraint;

Along the first direction, the binding member is provided on the side of the first battery cell (31) away from the second battery cell (32), and/or, along the first direction, the restraining member The binding member is provided on a side of the second battery cell (32) away from the first battery cell (31), and the first direction is configured as the thickness direction of the binding member.
The battery according to claim 11, wherein the battery (100) includes a box (10), and the restraint is configured as at least one of a bottom plate (121) or an upper cover of the box (10). By.
The battery according to claim 11 or 12, wherein the battery (100) includes at least two battery cell groups (30), at least one of the at least two battery cell groups (30) including the the first battery cell (31) and the second battery cell (32);

A partition is provided between two adjacent battery unit groups (30) of the at least two battery unit groups (30), and the bottom plate (121) and the upper cover are connected to the partition.
The battery according to claim 11, wherein the battery cell group (30) includes a module housing (22), and the restraints are configured as end plates, side plates of the module housing (22). One of the plates or end caps (21).
The battery of claim 11, wherein the battery (100) includes a box (10) and the restraint is configured as a dividing beam (40) of the box (10).
The battery according to any one of claims 13 to 15, wherein the restraint is configured towards at least part of the surface of the first battery cell (31) or the second battery cell (32) is a plane.
An electric device, wherein the electric device includes the battery (100) according to any one of claims 1 to 16, and the battery (100) is used to provide electric energy to the electric device.