Battery cells, batteries and electrical devices

Abstract

The embodiment of the present application provides a battery cell, a battery and an electrical device, which can improve the stability of the battery cell. The battery cell includes: a first wall and a second wall, which are connected to each other; wherein the first wall is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity, so that when the second wall is attached to other walls, an interaction force in the direction of gravity is formed between the second wall and the other walls. Through this technical solution, the first wall in the battery cell is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity. When the battery cell is installed, for example, when it is installed in the battery box, the second wall in the battery cell can be obliquely attached to the other walls in the box, and an interaction force in the direction of gravity can be formed between the two, so that the battery cell and the components where the other walls are located are mutually constrained, thereby improving the stability of the battery cell and reducing the safety risks brought to the battery cell by vibration and impact during use.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] Batteries are installed in electrical devices, such as electric vehicles. The movement of electrical devices such as vehicles will cause certain impacts on the batteries. If the stability of the battery cells in the battery is not good, the impact will have an adverse effect on the performance of the battery cells and may cause safety problems. Therefore, how to improve the stability of battery cells is a technical problem that needs to be solved in battery technology. Summary of the invention

[0004] The present application provides a battery cell, a battery and an electrical device, which can improve the stability of the battery cell.

[0005] In a first aspect, a battery cell is provided, comprising: a first wall and a second wall, which are connected to each other; wherein the first wall is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity, so that when the second wall is attached to other walls, an interaction force in the direction of gravity is formed between the second wall and the other walls.

[0006] Through the technical solution of the embodiment of the present application, the first wall in the battery cell is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity. Therefore, when the battery cell is installed, for example, in the battery box, the second wall in the battery cell can be obliquely attached to other walls in the box, and an interaction force in the direction of gravity can be formed between the two, so that the battery cell and the components where the other walls are located are mutually restricted, thereby improving the stability of the battery cell and reducing the safety risks brought to the battery cell by vibration and impact during use. In addition, the second wall can be coated with structural adhesive, which can be attached to other walls through the structural adhesive, which can further improve the stability of the battery cell. And the area of ​​the second wall set obliquely will be larger than the area of ​​the vertically set wall, so the area of ​​the structural adhesive coated on the second wall is also larger, which can further improve the stability of the battery cell.

[0007] In some possible implementations, the first wall and the second wall form a wedge-shaped structure.

[0008] In some possible implementations, a cross section of the battery cell on a plane perpendicular to the first wall and the second wall is a parallelogram.

[0009] Through the technical solution of this embodiment, the battery cell may include: two first walls parallel to each other and two second walls parallel to each other. The structure of the battery cell is relatively regular and symmetrical, which is convenient for manufacturing and installing the battery cell. In addition, the battery cell can be attached to other walls through the two inclined second walls to further increase the force between the battery cell and other walls in the direction of gravity, thereby improving the stability of the battery cell.

[0010] In some possible implementations, a cross-section of the battery cell on a plane perpendicular to the first wall and the second wall is a trapezoid.

[0011] Through the technical solution of this embodiment, the battery cell may include: two first walls parallel to each other and two second walls that are not parallel to each other. The battery cell can be attached to the other walls through the two inclined second walls to further increase the force between the battery cell and the other walls in the direction of gravity, thereby improving the stability of the battery cell.

[0012] In some possible implementations, the angle θ between the second wall and the gravity direction is in the range of 0°<θ≤60°.

[0013] In some possible implementations, the angle θ is in the range of 0°<θ≤10°.

[0014] By using the technical solution of this embodiment, the angle θ between the second wall and the gravity direction z is set within a certain angle range, which can balance the space occupied by the battery cell and the stability of the battery cell. When the angle θ is small, the lateral space occupied by the battery cell can be relatively reduced while ensuring the stability of the battery cell, thereby increasing the energy density of the battery in which the battery cell is located.

[0015] In some possible implementations, the battery cell has a hexahedral structure, and the first wall and the second wall are two adjacent walls in the hexahedral structure.

[0016] In some possible implementations, the first wall and / or the second wall extends along a length direction of the hexahedral structure.

[0017] Through the technical solution of this embodiment, the first wall and / or the second wall extend along the length direction of the battery cell of the hexahedral structure, so that the first wall and / or the second wall can have a longer length, and thus facilitate having a larger area. For the first wall, it is perpendicular to the direction of gravity. If it has a larger area, if the battery cell is set on a horizontal plane through the first wall, the battery cell can have higher stability. For the second wall, if it has a larger area, the interaction force between the second wall and other walls can be increased, and it is also convenient to set more structural adhesive on the second wall to improve the stability of the battery cell.

[0018] In some possible implementations, the first wall or the second wall is a wall with the largest area in the hexahedral structure.

[0019] In some possible implementations, a first dimension W of the hexahedral structure in its length direction is in the range of 100 mm ≤ W ≤ 1400 mm, and / or a second dimension T of the hexahedral structure in its thickness direction is in the range of 5 mm ≤ T ≤ 80 mm.

[0020] In some possible implementations, a first dimension W of the hexahedral structure in its length direction is in the range of 300 mm ≤ W ≤ 1200 mm, and / or a second dimension T of the hexahedral structure in its thickness direction is in the range of 5 mm ≤ T ≤ 30 mm.

[0021] In some possible implementations, the battery cell further includes: two electrode terminals, which are arranged on the same end surface of the battery cell in its length direction, or are respectively arranged on two end surfaces of the battery cell in its length direction.

[0022] Through the technical solution of this embodiment, the electrode terminals of the battery cell are arranged on the end face of the battery cell in the length direction L, which will not affect the attachment of the wall with a large area extending along the length direction of the battery cell to other walls, ensuring that the battery cell has good stability. In addition, according to actual design requirements, the electrode terminals can be arranged on the same end face or different end faces of the battery cell, so that the battery cell can be flexibly applied to a variety of power usage environments.

[0023] In some possible implementations, the battery cell further includes: a pressure relief mechanism, which is disposed on other walls of the battery cell except the second wall.

[0024] Through the technical solution of this embodiment, the pressure relief mechanism is arranged on other walls of the battery cell except the second wall, which also does not affect the attachment of the battery cell to other walls through the second wall, thereby ensuring the stability of the battery cell.

[0025] In a second aspect, a battery is provided, comprising: a box, and a plurality of battery cells according to the first aspect or any possible implementation of the first aspect; the box is used to accommodate the plurality of battery cells.

[0026] In some possible implementations, among the plurality of battery cells, two adjacent battery cells are attached to each other via two second walls, so that an interaction force in the direction of gravity is formed between the two second walls.

[0027] In a third aspect, an electrical device is provided, comprising: a battery as in the second aspect, wherein the battery is used to provide electrical energy to the electrical device.

[0028] Through the technical solution of the embodiment of the present application, the first wall in the battery cell is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity. Therefore, when the battery cell is installed, for example, in the battery box, the second wall in the battery cell can be obliquely attached to other walls in the box, and an interaction force in the direction of gravity can be formed between the two, so that the battery cell and the components where the other walls are located are mutually restricted, thereby improving the stability of the battery cell and reducing the safety risks brought to the battery cell by vibration and impact during use. In addition, the second wall can be coated with structural adhesive, which can be attached to other walls through the structural adhesive, which can further improve the stability of the battery cell. And the area of ​​the second wall set obliquely will be larger than the area of ​​the vertically set wall, so the area of ​​the structural adhesive coated on the second wall is also larger, which can further improve the stability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0030] Figure 1 is a structural schematic diagram of a vehicle disclosed in an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of the structure of a battery disclosed in one embodiment of the present application;

[0032] Figure 3 is a schematic structural diagram of a battery cell disclosed in one embodiment of the present application;

[0033] Figure 4 is a schematic structural diagram of a battery cell disclosed in one embodiment of the present application;

[0034] Figure 5 is a schematic structural diagram of a battery cell disclosed in one embodiment of the present application;

[0035] Figure 6 is a schematic structural diagram of a battery cell disclosed in one embodiment of the present application;

[0036] Figure 7 yes Figure 4 A front view and a side view of the battery cell shown;

[0037] Figure 8 yes Figure 6 A front view and a side view of the battery cell shown;

[0038] Fig. 9It is a schematic diagram of the structure of two battery cells disclosed in an embodiment of the present application;

[0039] Fig.10 It is a schematic top view and cross-sectional view of a battery disclosed in one embodiment of the present application.

[0040] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0041] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0042] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0043] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0046] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0047] In this application, a battery refers to a physical module that includes one or more battery cells to provide electrical energy. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0048] Optionally, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which is not limited in the present embodiment. In some embodiments, the battery cell may also be referred to as a battery cell.

[0049] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current does not melt, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the diaphragm can be polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0050] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the stability of the battery when installed in the electrical device must also be considered to improve the safety of the battery in the electrical device.

[0051] In some battery packaging technologies, battery cells can be directly installed in the battery box, and the battery cells can be connected to each other through the adhesive layer. For conventional square battery cells, the battery cells are fixed to each other through structural adhesive to prevent external impact. In this case, the coating area of ​​the structural adhesive between the battery cells is limited, and there is no interaction force between the battery cells. The stability of the battery cells is poor, and the overall strength and rigidity of the packaged battery will be limited, which will affect the stability of the battery and bring certain safety hazards.

[0052] In view of this, the present application provides a technical solution, in which the battery cell is designed as a special-shaped battery cell different from the conventional square battery cell, and the special-shaped battery cell includes a first wall and a second wall connected to each other, wherein the first wall is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity. When the battery cell is installed, for example, in a battery box, the second wall in the battery cell can be attached to other walls in the box. When the second wall inclined relative to the direction of gravity is attached to the other walls, an interaction force in the direction of gravity can be formed between the two, so that the battery cell and the components where the other walls are located are mutually constrained, thereby improving the stability of the battery cell, improving the overall strength and rigidity of the battery where the battery cell is located, and reducing the safety risks brought to the battery cell by vibration and impact during use.

[0053] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0054] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0055] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 11, a controller 12 and a battery 10 may be arranged inside the vehicle 1. The controller 12 is used to control the battery 10 to supply power to the motor 11. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0056] In order to meet different power requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery may also be referred to as a battery pack. Optionally, multiple battery cells may be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells may be directly connected to form a battery, or may be first connected to form a battery module, and then the battery module may be connected to form a battery.

[0057] For example, Figure 2 , which is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application, wherein the battery 10 may include a plurality of battery cells 20. The battery 10 may also include a housing 100 (or housing), wherein the interior of the housing 100 is a hollow structure, and the plurality of battery cells 20 are accommodated in the housing 100. Figure 2 As shown, the box body 100 may include two parts, which are respectively referred to as the first part 111 and the second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 may be determined according to the shapes of the combination of multiple battery cells 20, and the first part 111 and the second part 112 may both have an opening. For example, the first part 111 and the second part 112 may both be hollow cuboids and each has only one face as an opening face, the opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are buckled together to form the box body 100 with a closed chamber. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and are placed in the box body 100 formed by buckling the first part 111 and the second part 112.

[0058] Optionally, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 20, such as parallel connection, series connection or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box 100 through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0059] According to different power requirements, the number of battery cells 20 can be set to any value. A plurality of battery cells 20 can be connected in series, in parallel or in a mixed manner to achieve a larger capacity or power.

[0060] like Figure 3, which is a schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application, and the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The wall of the shell 211 and the cover plate 212 are both referred to as the wall of the battery cell 20. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. As an example, Figure 3 The housing 211 shown in the figure can be a hollow cuboid. One of the faces of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed in the housing 211. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte.

[0061] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the cover plate 212, and the two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connection member 23, or may also be referred to as a current collecting member 23, which is located between the cover plate 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0062] like Figure 3 As shown, each electrode assembly 22 has a first pole tab 221a and a second pole tab 222a. The polarities of the first pole tab 221a and the second pole tab 222a are opposite. For example, when the first pole tab 221a is a positive pole tab, the second pole tab 222a is a negative pole tab. The first pole tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal through a connecting member 23, and the second pole tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal through another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive pole tab through a connecting member 23, and the negative electrode terminal 214b is connected to the negative pole tab through another connecting member 23.

[0063] In the battery cell 20, the electrode assembly 22 can be provided as a single electrode assembly or multiple electrode assemblies according to actual use requirements. Figure 3 As shown, four independent electrode assemblies 22 are disposed in the battery cell 20 .

[0064] As an example, a pressure relief mechanism 213 may be further provided on one wall of the battery cell 20. The pressure relief mechanism 213 is used to be actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.

[0065] Optionally, in another embodiment of the present application, the pressure relief mechanism 213 and the electrode terminal 214 are disposed on the same wall of the battery cell 20. As an example, Figure 3 As shown, the electrode terminal 214 and the pressure relief mechanism 213 can both be disposed on the top wall of the battery cell 20 , namely, the cover plate 212 .

[0066] The pressure relief mechanism 213 and the electrode terminal 214 are arranged on the same wall of the battery cell 20 , such as on the cover plate 212 of the battery cell 20 , which can facilitate the processing and installation of the pressure relief mechanism 213 and the electrode terminal 214 and help improve the production efficiency of the battery 10 .

[0067] Of course, in other embodiments of the present application, the pressure relief mechanism 213 and the electrode terminal 214 may also be arranged on different walls of the battery cell 20. For example, the electrode terminal 214 is arranged on the top wall of the battery cell 20, that is, the cover plate 212, and the pressure relief mechanism 213 is arranged on the bottom wall opposite to the top wall.

[0068] The pressure relief mechanism 213 may be a part of the wall where it is located, or may be a separate structure from the wall where it is located, and may be fixed to the wall where it is located by welding, for example. Figure 3 In the illustrated embodiment, when the pressure relief mechanism 213 is a part of the bottom wall 215, the pressure relief mechanism 213 can be formed by providing a notch on the bottom wall 215, and the thickness of the bottom wall 215 corresponding to the notch is less than the thickness of the pressure relief mechanism 213 in other areas except the notch. The notch is the weakest position of the pressure relief mechanism 213. When the battery cell 20 generates too much gas so that the internal pressure of the shell 211 increases and reaches a threshold value, or the internal reaction of the battery cell 20 generates heat, causing the internal temperature of the battery cell 20 to increase and reach a threshold value, the pressure relief mechanism 213 may rupture at the notch, causing the inside and outside of the shell 211 to communicate with each other, and the gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 213, thereby preventing the battery cell 20 from exploding.

[0069] In addition, the pressure relief mechanism 213 may be any possible pressure relief mechanism, which is not limited in the embodiments of the present application. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0070] Figure 4 FIG. 2 shows a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. Figure 4As shown, the battery cell 20 includes: a first wall 201 and a second wall 202, which are connected to each other; wherein the first wall 201 is perpendicular to the direction of gravity, and the second wall 202 is inclined relative to the direction of gravity, so that when the second wall 202 is attached to other walls, an interaction force in the direction of gravity is formed between the second wall 202 and the other walls.

[0071] Specifically, in the embodiment of the present application, the first wall 201 and the second wall 202 may be the housing 211 or the cover plate 212 in the battery cell 20 described above.

[0072] Optionally, the first wall 201 and the second wall 202 are connected to each other to form a wedge-shaped structure. Specifically, the angle between the first wall 201 and the second wall 202 can be an acute angle to form a wedge-shaped structure with an acute vertex angle.

[0073] Or, optionally, the angle between the first wall 201 and the second wall 202 may also be an obtuse angle. In this case, it can also be understood that a wedge-shaped structure with an obtuse apex angle is formed between the first wall 201 and the second wall 202 .

[0074] In addition, if Figure 4 As shown, in the battery cell 20, the first wall 201 is perpendicular to the gravity direction z, and the second wall 202 is inclined relative to the gravity direction z. When the battery cell 20 is installed, for example, in the box 100 of the battery 10, the second wall 202 in the battery cell 20 can be attached to the wall of other components in the box 100 (hereinafter referred to as other walls). When the second wall 202 inclined relative to the gravity direction is attached to the other wall, an interaction force in the gravity direction can be formed between the two, so that the battery cell 20 and other components are mutually constrained, thereby improving the stability of the battery cell 20 and reducing the safety risks brought to the battery cell 20 by vibration and impact during use.

[0075] Optionally, in one embodiment of the present application, the second wall 202 may be coated with structural adhesive, and it is attached to other walls through the structural adhesive, which can further improve the stability of the battery cell 20. And the area of ​​the second wall 202 arranged obliquely is larger than the area of ​​the vertically arranged wall, so the area of ​​the structural adhesive coated on the second wall 202 is also larger, which can further improve the stability of the battery cell 20.

[0076] As an example, the second wall 202 of the above-mentioned battery cell 20 can be attached to the second wall 202 of other battery cells to achieve mutual connection between two adjacent battery cells 20, and a force is formed between the two adjacent battery cells 20 in the gravity direction z, so that the two are bound and restricted to each other, thereby improving the stability of the two adjacent battery cells 20.

[0077] Optionally, in one embodiment of the present application, the cross-section of the battery cell 20 on a plane perpendicular to the first wall 201 and the second wall 202 may be a parallelogram.

[0078] In this embodiment, the battery cell 20 may include: two first walls 201 parallel to each other and two second walls 202 parallel to each other. The structure of the battery cell 20 is relatively regular and symmetrical, which facilitates the manufacture and installation of the battery cell 20.

[0079] Optionally, in another embodiment of the present application, the cross-section of the battery cell 20 on a plane perpendicular to the first wall 201 and the second wall 202 may be a trapezoid.

[0080] In this embodiment, the battery cell 20 may include: two mutually parallel first walls 201 and two non-parallel second walls 202 , both of which are inclined relative to the direction of gravity, and the two non-parallel second walls 202 form the waist of the trapezoidal cross section.

[0081] Through the above two methods, the battery cell 20 can include two second walls 202 inclined relative to the direction of gravity. The battery cell 20 can be attached to other walls through the two inclined second walls 202 to further increase the force between the battery cell 20 and other walls in the direction of gravity, thereby improving the stability of the battery cell 20.

[0082] Specifically, as an example, a battery cell 20 can be connected to two other battery cells respectively through two inclined second walls 202, so as to realize the mutual connection of multiple battery cells 20, and the installation of multiple battery cells 20 in the box 100 of the battery 10, thereby improving the strength and rigidity of the connection between the multiple battery cells 20 in the gravity direction z, improving the stability of the multiple battery cells 20 in the box 100, and reducing the safety risks brought to the multiple battery cells 20 by vibration impact during use.

[0083] Figure 5 A schematic structural diagram of another battery cell 20 provided in an embodiment of the present application is shown.

[0084] Alternatively, if Figure 4 and Figure 5 As shown, the battery cell 20 may be a hexahedral structure, and the battery cell 20 may include: two first walls 201 arranged opposite to each other, two second walls 202 arranged opposite to each other, and two third walls 203 arranged opposite to each other and connected to the first wall 201 and the second wall 202. The first wall 201 and the second wall 202 are arranged adjacent to each other and connected to each other.

[0085] Optionally, in Figure 4 and Figure 5In the illustrated embodiment, the third wall 203 may be perpendicular to the first wall 201 and the second wall 202, and the shape of the third wall 203 is the same as the cross-sectional shape of the battery cell 20 on the plane perpendicular to the first wall 201 and the second wall 202. Figure 4 As shown, the shape of the third wall 203 can be a parallelogram, or, as shown in FIG. Figure 5 As shown, the shape of the third wall 203 may be a trapezoid.

[0086] Of course, the third wall 203 may not be perpendicular to the first wall 201 and the second wall 202. In this case, the shape of the third wall 203 may also be a parallelogram or a trapezoid. The embodiment of the present application does not limit the specific configuration of the third wall 203.

[0087] Optionally, in some embodiments, the first wall 201 and / or the second wall 202 extend along the length direction of the hexahedral battery cell 20 .

[0088] It can be understood that in three-dimensional space, the dimension of the hexahedral structure in its length direction is greater than the dimensions of the hexahedral structure in other directions. In other words, the direction with the largest dimension in the hexahedral structure is its length direction.

[0089] For example, in Figure 4 and Figure 5 In the illustrated embodiment, both the first wall 201 and the second wall 202 extend along the length direction L of the hexahedral battery cell 20 .

[0090] In this embodiment, the first wall 201 and / or the second wall 202 extend along the length direction of the hexahedral battery cell 20, so that the first wall 201 and / or the second wall 202 have a longer length and thus a larger area. For the first wall 201, it is perpendicular to the gravity direction z. If it has a larger area, if the battery cell 20 is set on a horizontal plane through the first wall 201, the battery cell 20 can have a higher stability. For the second wall 202, if it has a larger area, the interaction force between the second wall 202 and other walls can be increased, and it is also convenient to set more structural adhesive on the second wall 202 to improve the stability of the battery cell 20.

[0091] exist Figure 4 and Figure 5 In the illustrated embodiment, the second wall 202 is the wall with the largest area in the hexahedral battery cell 20 .

[0092] Of course, the second wall 202 may not be the wall with the largest area in the hexahedral battery cell 20. For example, Figure 6 A schematic structural diagram of another battery cell 20 provided in an embodiment of the present application is shown.

[0093] like Figure 6 As shown, the first wall 201 located at the bottom of the battery cell 20 is the wall with the largest area in the battery cell 20 of the hexahedral structure, and the second wall 202 is a side surface of the battery cell 20. In this embodiment, in addition to the second wall 202 being attached to the walls of other battery cells to achieve the connection of multiple battery cells 20 in the horizontal direction, the first wall 201 can also be attached to the walls of other battery cells, and multiple battery cells 20 can be stacked and connected in the gravity direction through the first wall 201.

[0094] Optionally, in the above Figures 4 to 6 In the illustrated embodiment, the hexahedral battery cell 20 may have the largest dimension in its length direction, and at the same time, the hexahedral battery cell 20 may have the smallest dimension in its thickness direction. Figures 4 to 6 The battery cell 20 shown in the figure can be referred to as a blade-type battery cell or a blade-type battery core. A plurality of blade-type battery cells can be conveniently connected to each other along the thickness direction thereof and directly installed in the box 100 of the battery 10 as a whole.

[0095] Figure 7 Figure (a) shows Figure 4 A front view of the battery cell 20 is shown. Figure 7 Figure (b) shows Figure 4 A side view of a battery cell 20 is shown.

[0096] Figure 8 Figure (a) shows Figure 6 A front view of the battery cell 20 is shown. Figure 8 Figure (b) shows Figure 6 A side view of a battery cell 20 is shown.

[0097] Alternatively, if Figure 7 and Figure 8 As shown, the first dimension of the hexahedral battery cell 20 in the length direction may be represented by W, and the second dimension in the thickness direction may be represented by T.

[0098] As an example but not limitation, the first dimension W may be in the range of 100 mm ≤ W ≤ 1400 mm. Further, the first dimension W may be in the range of 300 mm ≤ W ≤ 1200 mm.

[0099] As an example but not limitation, the range of the second dimension T may be: 5 mm ≤ T ≤ 80 mm. Further, the range of the second dimension T may be: 5 mm ≤ T ≤ 30 mm.

[0100] Alternatively, if Figure 7 and Figure 8As shown, in the battery cell 20 , the angle between the second wall 202 and the gravity direction z can be represented by θ.

[0101] As an example but not limitation, the angle θ between the second wall 202 and the gravity direction z may be in the range of 0°<θ≤60°. Further, the angle θ between the second wall 202 and the gravity direction z may be in the range of 0°<θ≤10°.

[0102] In the technical solution of the embodiment of the present application, by controlling the angle θ between the second wall 202 and the gravity direction z, the occupied space of the battery cell 20 and the stability of the battery cell 20 can be balanced. When the angle θ is small, on the basis of ensuring the stable installation of the battery cell 20, the lateral space required to be occupied by the battery cell 20 can be relatively reduced, thereby improving the energy density of the battery 10.

[0103] Optionally, the battery cell 20 may further include two electrode terminals 214. Specifically, the two electrode terminals 214 are respectively a positive terminal and a negative terminal. As an example, the two electrode terminals 214 may be disposed on the same end surface of the battery cell 20 in the length direction L. As another example, the two electrode terminals 214 may also be disposed on two end surfaces of the battery cell 20 in the length direction L.

[0104] For example, in the above Figures 4 to 8 In the illustrated embodiment, the two end faces of the battery cell 20 in the length direction L are the surfaces of the two third walls 203. Figure 4 , Figure 5 as well as Figure 7 In the illustrated embodiment, two electrode terminals 214 may be disposed on the same third wall 203. Figure 6 as well as Figure 8 In the illustrated embodiment, two electrode terminals 214 are respectively disposed on two third walls 203 .

[0105] Through the technical solution of the embodiment of the present application, the electrode terminal 214 of the battery cell 20 is arranged on the end face of the battery cell 20 in the length direction L thereof, which will not affect the attachment of the wall extending along the length direction of the battery cell 20 and having a large area to other walls, thereby ensuring that the battery cell 20 has good stability. In addition, according to actual design requirements, the electrode terminal 214 can be arranged on the same end face or different end faces of the battery cell 20, so that the battery cell 20 can be flexibly applied to a variety of power usage environments.

[0106] Fig. 9 Schematic structural diagrams of two other battery cells 20 provided in the embodiments of the present application are shown.

[0107] like Fig. 9As shown, the battery cell 20 may further include: a pressure relief mechanism 213 , which may be disposed on other walls of the battery cell 20 except the second wall 202 , such as the first wall 201 or the third wall 203 .

[0108] For example, in Fig. 9 In the embodiment shown in FIG. (a), the pressure relief mechanism 213 is disposed on the third wall 203 located at the end surface of the battery cell 20 , and the pressure relief mechanism 213 may be disposed between two electrode terminals 214 .

[0109] Or, in Fig. 9 In the embodiment shown in Figure (b), the pressure relief mechanism 213 is disposed on the first wall 201 located on the top surface or the bottom surface of the battery cell 20. In this embodiment, the battery cell 20 is connected to other battery cells through the second wall 202, and the pressure relief mechanism 213 and the electrode terminal 214 are respectively located on different walls of the battery cell 20, which can prevent the pressure relief mechanism 213 from affecting the electrode terminal 214 when releasing the discharge inside the battery cell, thereby improving the safety performance of the battery cell 20.

[0110] It should be noted that in Fig. 9 In the embodiment shown, the two electrode terminals 214 are provided on the same end surface of the battery cell 20. As an alternative, the two electrode terminals 214 can be provided on two end surfaces of the battery cell 20 respectively. In this case, the relevant technical scheme of the pressure relief mechanism 213 can still be referred to above. Fig. 9 The relevant description of the illustrated embodiment will not be repeated here.

[0111] An embodiment of the present application further provides a battery 10 , which may include a housing 100 and a plurality of battery cells 20 in the aforementioned embodiments. The housing 100 may be used to accommodate the plurality of battery cells 20 .

[0112] Optionally, among the multiple battery cells 20, two adjacent battery cells 20 may be attached to each other via their second walls 202 inclined relative to the gravity direction z, so as to form an interaction force in the gravity direction z between the two second walls 202 to improve the stability of the battery cells 20 in the box.

[0113] Fig.10 A schematic top view and a cross-sectional view of the battery 10 are shown. Fig.10 Figure (a) is a schematic top view of the battery 10. Fig.10 Figure (b) is a schematic cross-sectional view along the AA' direction in Figure (a).

[0114] As an example, Fig.10 The battery cell 20 in the embodiment may be Figure 4 and Figure 7 The battery cell 20 in the illustrated embodiment.

[0115] In this example, the battery cell 20 may have two second walls 202 arranged opposite to each other, and the two second walls 202 are inclined relative to the direction of gravity, so that multiple battery cells 20 are attached to each other in sequence through their second walls 202. At the same time, among the multiple battery cells 20, at least one second wall 202 of each battery cell 20 is pressed by the second wall 202 of the adjacent battery cell 20, so that each battery cell 20 is bound by the adjacent battery cell 20, and the battery cells 20 and the battery cells 20 form a force and restrict each other, which can improve the overall rigidity and strength of the battery 10 and reduce the safety risks brought to the battery 10 by vibration and impact during use.

[0116] An embodiment of the present application further provides an electrical device, which may include the battery 10 in the aforementioned embodiments, and the battery 10 is used to provide electrical energy to the electrical device.

[0117] Optionally, the electrical device may be a vehicle 1 , a ship or a spacecraft.

[0118] By setting the battery 10 of the aforementioned embodiment in the electrical device, since the battery cells 20 in the battery 10 have high stability, the safety risks brought to the battery 10 by vibration and impact during the use of the electrical device can be reduced, thereby improving the overall safety performance of the electrical device and facilitating the promotion and use of the electrical device.

[0119] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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

1. A battery cell, characterized in that: include: a first wall and a second wall, the first wall and the second wall being connected to each other; The first wall is perpendicular to the direction of gravity, and the second wall is inclined relative to the direction of gravity, so that when the second wall is attached to other walls, an interaction force in the direction of gravity is formed between the second wall and the other walls, and the first wall and the second wall form a wedge-shaped structure.

2. The battery cell according to claim 1, characterized in that: A cross section of the battery cell on a plane perpendicular to the first wall and the second wall is a parallelogram.

3. The battery cell according to claim 1, characterized in that: A cross section of the battery cell on a plane perpendicular to the first wall and the second wall is a trapezoid.

4. The battery cell according to claim 1, characterized in that: The range of the angle θ between the second wall and the gravity direction is 0°<θ≤60°.

5. The battery cell according to claim 4, characterized in that: The range of the angle θ is 0°<θ≤10°.

6. The battery cell according to claim 1, characterized in that: The battery cell has a hexahedral structure, and the first wall and the second wall are two adjacent walls in the hexahedral structure.

7. The battery cell according to claim 6, characterized in that: The first wall and / or the second wall extends along a length direction of the hexahedral structure.

8. The battery cell according to claim 6, characterized in that: The first wall or the second wall is a wall with the largest area in the hexahedral structure.

9. The battery cell according to claim 6, characterized in that: The first dimension W of the hexahedral structure in its length direction is in the range of: 100 mm ≤ W ≤ 1400 mm, and / or, The range of the second dimension T of the hexahedral structure in the thickness direction is: 5mm≤T≤80mm.

10. The battery cell according to claim 6, characterized in that: The first dimension W of the hexahedral structure in its length direction is in the range of: 300 mm ≤ W ≤ 1200 mm, and / or, The range of the second dimension T of the hexahedral structure in the thickness direction is: 5mm≤T≤30mm.

11. The battery cell according to claim 1, characterized in that: The battery cell further includes: two electrode terminals, which are arranged on the same end surface of the battery cell in the length direction thereof, or are respectively arranged on two end surfaces of the battery cell in the length direction thereof.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The battery cell further includes: a pressure relief mechanism, which is arranged on other walls of the battery cell except the second wall.

13. A battery, characterized in that: include: A box body, and a plurality of battery cells as claimed in any one of claims 1 to 12; The box is used to accommodate a plurality of the battery cells.

14. The battery according to claim 13, characterized in that Among the plurality of battery cells, two adjacent battery cells are attached to each other via two second walls, so that a mutual interaction force in the direction of gravity is formed between the two second walls.

15. An electrical device, characterized in that: include: The battery according to claim 13 or 14, wherein the battery is used to provide electrical energy to the electrical device.

Images