CN119029474A - Battery cells, battery devices and electrical equipment - Google Patents

Abstract

The present application discloses a battery cell, a battery device and an electrical device. The battery cell includes a shell, a pressure relief mechanism, an electrode assembly and an insulating member. The shell includes a plurality of side walls, including a first side wall and a second side wall intersecting each other. Among the plurality of side walls, the second side wall is the side wall with the largest area. The pressure relief mechanism is arranged on the first side wall. The electrode assembly is arranged inside the shell. The insulating member is arranged inside the shell and insulated between the first side wall and the electrode assembly. The first side wall and the electrode assembly are respectively abutted against the insulating member. The insulating member includes a first insulating body and a second insulating body respectively connected to the first side wall. The melting point of the second insulating body is greater than the melting point of the first insulating body. The insulating member includes at least a second insulating body on one side facing the electrode assembly. The second insulating body is arranged to support the electrode assembly when the first insulating body is softened by heat. The second insulating body supports the electrode assembly, which reduces the problem of premature failure of the battery cell.

Description

Battery cells, battery devices and electrical equipment

Technical Field

The present application relates to the field of energy storage technology, and in particular to a battery cell, a battery device and an electrical equipment.

Background Art

With the development of new energy, more and more fields are using new energy as a power source. Due to its advantages such as high energy density, rechargeable, safe and environmentally friendly, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

In the related art, a battery device includes a plurality of battery cells, and the battery cells include a housing, an insulating member, a pressure relief mechanism, and an electrode assembly. The insulating member and the electrode assembly are arranged in the housing, and the insulating member is used to insulate the electrode assembly from the housing. When a battery cell in the battery device experiences thermal runaway, the insulating member in the adjacent battery cell will soften due to heat. When the pressure relief mechanism releases pressure, the electrode assembly will move and hit the insulating member. The sharp position on the insulating member will cause the electrode assembly to short-circuit, thereby causing the failure of the battery cell to occur prematurely.

Summary of the invention

In view of the above problems, the present application provides a battery cell, a battery device and an electrical equipment, which solve the problem of premature failure of the battery cell due to softening of the insulating parts in the battery cell due to heat.

A first aspect of the present application provides a battery cell, the battery cell comprising:

The shell includes a plurality of side walls, the plurality of side walls include a first side wall and a second side wall arranged to intersect each other, and among the plurality of side walls, the second side wall has the largest area;

a pressure relief mechanism, the pressure relief mechanism being disposed on the first side wall and being configured to open or close according to the internal pressure of the housing;

An electrode assembly, the electrode assembly being arranged inside the housing;

An insulating member is disposed in the housing and is insulated between the first side wall and the electrode assembly, and the first side wall and the electrode assembly are respectively in contact with the insulating member;

Among them, the insulating part includes a first insulating body and a second insulating body respectively connected to the first side wall, the melting point of the second insulating body is greater than the melting point of the first insulating body, the side of the insulating part facing the electrode assembly includes at least the second insulating body, the second insulating body is configured to support the electrode assembly when the first insulating body is softened by heat, the side of the insulating part facing the electrode assembly includes a protruding structure, the protruding structure abuts against the electrode assembly, the second insulating body constitutes at least a part of the protruding structure, and along the arrangement direction of the electrode assembly and the first side wall, the maximum size of the second insulating body is equal to the size of the protruding structure.

Specifically, the insulating part includes at least a second insulating body on one side facing the electrode assembly. The second insulating body constitutes a partial structure of the insulating part. Since the melting point of the second insulating body is greater than that of the first insulating body, when the first insulating body is softened by heat, the second insulating body is not softened. The second insulating body can be used to support the electrode assembly, thereby reducing the problem of premature failure of the battery cell due to the softening of the insulating part by heat.

In some embodiments of the present application, the housing comprises:

a housing having an opening;

The end cover is connected to the shell and closes the opening, the end cover constitutes the first side wall, and the pressure relief mechanism is arranged on the end cover.

The outer shell is divided into two parts, namely, a shell and an end cover, and the pressure relief mechanism is arranged on the end cover, thereby improving the convenience of processing and assembly and effectively improving the production efficiency.

In some embodiments of the present application, the end cap is a metal part, and the battery cell further includes an electrode terminal and an insulating component, wherein the electrode terminal is disposed on the end cap and is spaced apart from the pressure relief mechanism, and the insulating component is disposed between the electrode terminal and the end cap to insulate the electrode terminal from the end cap. Such an arrangement can increase the structural strength of the end cap and improve the impact resistance of the battery cell.

In some embodiments of the present application, when the volume energy density of the second insulating body is less than 390Wh/L, the melting point of the second insulating body is greater than or equal to 150° C.;

And/or, when the volume energy density of the second insulating body is greater than or equal to 390Wh/L, the melting point of the second insulating body is greater than or equal to 200°C.

Such a configuration enables the second insulating body to adapt to the current energy density of the battery cell, thereby improving the heat insulation capacity of the second side wall and further reducing the problem of premature failure of the battery cell due to softening of the insulating member due to heat.

In some embodiments of the present application, the side of the insulating member facing the second side wall includes at least the second insulating body, the number of the second side walls is two, the two second side walls are arranged in parallel and spaced apart, and the two sides of the insulating member facing the two second side walls respectively include the second insulating body. The two second side walls are provided so that the battery cells can exchange heat through the two second side walls, thereby improving the heat exchange efficiency of the battery cells.

In some embodiments of the present application, at least part of the end of the protruding structure facing the second side wall is formed by the second insulating body. In this way, the second insulating body can be used to block the heat of the second side wall, reducing the softening of the protruding structure due to heat, so that the supporting performance of the protruding structure on the electrode assembly is effectively improved.

In some embodiments of the present application, a side of the first insulating body facing the second side wall is connected to the second insulating body;

And/or, a side of the first insulating body facing the electrode assembly is connected to the second insulating body.

With such an arrangement, the connection position can be set according to the convenience of assembly during the assembly process, thereby improving the efficiency of assembly and increasing the production rhythm.

In some embodiments of the present application, the first insulating body is connected to the second insulating body on one side facing the electrode assembly, and the second insulating body constitutes the entire structure of the protruding structure. This arrangement enables the insulating member to have good support performance for the electrode assembly, reduces the movement of the electrode assembly when the pressure relief mechanism releases pressure, and further reduces the situation where the electrode assembly is punctured by the insulating member due to the movement.

In some embodiments of the present application, the first insulating body includes a protruding body, and the second insulating body is disposed at one end of the protruding body facing the electrode assembly and abuts against the electrode assembly. In this arrangement, the second insulating body is used to reduce the temperature resistance of the insulating member, reduce the softening caused by heat, thereby improving the support performance of the electrode assembly, reducing the movement of the electrode assembly when the pressure relief mechanism releases pressure, and further reducing the situation where the electrode assembly is punctured by the insulating member due to the movement.

In some embodiments of the present application, a receiving groove is provided on the side of the protruding body facing the electrode assembly, and at least a portion of the second insulating body is provided in the receiving groove. In this arrangement, the receiving groove is used to accommodate at least a portion of the structure of the second insulating body, thereby reducing the occupation of the internal space of the battery cell and reducing the impact on the energy density of the battery cell.

In some embodiments of the present application, the second insulating body is flush with the notch of the receiving groove, and the protruding body and the second insulating body are respectively in contact with the electrode assembly;

Alternatively, the second insulating body closes the notch of the receiving groove, and the protruding body abuts against the electrode assembly through the second insulating body.

Such a configuration can increase the contact area between the first insulating body and the second insulating body, thereby improving the fixing strength and stability of the first insulating body and the second insulating body.

In some embodiments of the present application, the connection between the protruding body and the second insulating body includes clamping, welding, bonding or connection via a connector. Such a configuration can facilitate processing, thereby improving processing efficiency.

In some embodiments of the present application, the connection between the first insulating body and the second insulating body includes clamping, welding, bonding or connection via a connector. Such a configuration can facilitate processing, thereby improving processing efficiency.

In some embodiments of the present application, along the arrangement direction of the electrode assembly and the first side wall, the second insulating body includes a first size, and the first size is greater than or equal to 0.05 mm and less than or equal to 6 mm. In this way, the second insulating body can effectively control the volume of the second insulating body while having good thermal insulation performance for the second side wall, thereby reducing the manufacturing cost of the insulating member.

In some embodiments of the present application, the first size is greater than or equal to 0.1 mm and less than or equal to 4 mm. In this way, the volume of the second insulating body can be further controlled on the basis of the second insulating body having good thermal insulation performance for the second side wall, thereby reducing the manufacturing cost of the insulating member.

In some embodiments of the present application, the material of the second insulating body includes at least one of polypropylene, polyethylene terephthalate, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer and polyimide. In this way, the second insulating body can be configured according to the battery cell, thereby improving the flexibility in the manufacturing process.

In some embodiments of the present application, along the arrangement direction of the electrode assembly and the second side wall, the second insulating body includes a second size, and the second size is greater than or equal to 3 mm and less than or equal to 50 mm. In this way, along the arrangement direction of the electrode assembly and the second side wall, the second insulating body has a sufficient size so that the second insulating body has good temperature resistance, and on the basis of being able to provide good support for the motor assembly, the occupation of the internal space of the battery cell is reduced, thereby reducing the impact on the energy density of the battery cell.

In some embodiments of the present application, the second dimension is greater than or equal to 5 mm and less than or equal to 35 mm. With such a configuration, along the arrangement direction of the electrode assembly and the second side wall, the second insulating body is further made to have a sufficient size so that the second insulating body has good temperature resistance, and on the basis of being able to provide good support for the motor assembly, the internal space occupied by the battery cell is reduced, thereby reducing the impact on the energy density of the battery cell.

A second aspect of the present application provides a battery device, the battery device comprising at least one battery cell, wherein the battery cell is the battery cell according to the above.

In the battery device, inside the battery cell, on the side of the insulating part facing the second side wall, the second insulating body constitutes a partial structure of the insulating part. Since the melting point of the second insulating body is greater than the melting point of the first insulating body, the second insulating body can be used to block the heat on the second side wall, thereby reducing the problem of premature failure of the battery cell due to softening of the insulating part due to heat.

A third aspect of the present application provides an electrical device, which includes the battery device as described above.

In the electrical equipment, inside the battery cell of the battery device, on the side of the insulating part facing the second side wall, the partial structure of the insulating part constituted by the second insulating body, since the melting point of the second insulating body is greater than the melting point of the first insulating body, the second insulating body can be used to block the heat on the second side wall, thereby reducing the problem of premature failure of the battery cell due to softening of the insulating part due to heat.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 schematically shows a schematic structural diagram of a vehicle according to an embodiment of the present application;

FIG2 schematically shows a schematic structural diagram of a battery device according to an embodiment of the present application;

FIG3 schematically shows a schematic structural diagram of a battery cell according to an embodiment of the present application;

FIG4 is a cross-sectional view of the battery cell shown in FIG3 taken along line A-A (the battery cell is some embodiments);

FIG5 is a cross-sectional view of the battery cell shown in FIG3 taken along line A-A (the battery cell is another embodiment);

FIG6 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG7 is a schematic diagram of the exploded structure of the insulating member shown in FIG6 ;

FIG8 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG9 is a schematic diagram of the exploded structure of the insulating member shown in FIG8 ;

FIG10 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG11 is a schematic diagram of the exploded structure of the insulating member shown in FIG10 ;

FIG12 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG13 is a schematic diagram of the exploded structure of the insulating member shown in FIG12;

FIG14 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG15 is a schematic diagram of the exploded structure of the insulating member shown in FIG14;

FIG16 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG17 is a schematic diagram of the exploded structure of the insulating member shown in FIG16;

FIG18 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG19 is a schematic diagram of the exploded structure of the insulating member shown in FIG18;

FIG20 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG21 is a schematic diagram of the exploded structure of the insulating member shown in FIG20;

FIG22 is a schematic structural diagram of the insulating member shown in FIG20 from another perspective;

FIG23 schematically shows an exploded structural diagram of a battery cell according to an embodiment of the present application;

FIG24 is a schematic diagram of the exploded structure of the insulating member shown in FIG23;

FIG. 25 is a schematic structural diagram of the insulating member shown in FIG. 23 from another perspective.

The reference numerals are as follows:

1000. Vehicles;

100, battery device; 200, controller; 300, motor;

110. Battery monomer assembly;

10. Battery cells;

11. Shell;

111. end cover; 1111. first side wall;

112. Shell;

1121, second side wall;

12. Pressure relief mechanism;

13. Electrode terminal;

14. Insulation parts;

141, first insulating body; 1411, first via hole; 1412, second via hole; 1413, protruding body; 1414, containing structure; 142, second insulating body;

15. Electrode assembly;

16. Current collecting components;

17. Insulation parts;

120, box body;

1201, first box; 1202, second box.

X, first direction; Y, second direction; L1, first size; L2, second size.

DETAILED DESCRIPTION

The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

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 to "embodiments" herein 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 herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

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

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 the specific circumstances.

At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

In the related art, a battery device includes a plurality of battery cells, and the battery cells include a housing, an insulating member, a pressure relief mechanism, and an electrode assembly. The insulating member and the electrode assembly are arranged in the housing, and the insulating member is used to insulate the electrode assembly from the housing. When a battery cell in the battery device experiences thermal runaway, the insulating member in the adjacent battery cell will soften due to heat. When the pressure relief mechanism releases pressure, the electrode assembly will move and hit the insulating member. The sharp position on the insulating member will cause the electrode assembly to short-circuit, thereby causing the failure of the battery cell to occur prematurely.

In the present application, a battery cell includes a shell, a pressure relief mechanism, an electrode assembly and an insulating member, the shell includes a plurality of side walls, the plurality of side walls include a first side wall and a second side wall intersecting each other, among the plurality of side walls, the second side wall is the side wall with the largest area, the pressure relief mechanism is arranged on the first side wall, the pressure relief mechanism is configured to be opened or closed according to the internal pressure of the shell, the electrode assembly is arranged inside the shell, the insulating member is arranged inside the shell and insulated between the first side wall and the electrode assembly, and the first side wall and the electrode assembly are respectively abutted against the insulating member. Among them, the insulating member includes a first insulating body and a second insulating body respectively connected to the first side wall, the melting point of the second insulating body is greater than the melting point of the first insulating body, the side of the insulating member facing the electrode assembly at least includes the second insulating body, the second insulating body is arranged to support the electrode assembly when the first insulating body is softened by heat, the side of the insulating member facing the electrode assembly includes a protruding structure, the protruding structure abuts against the electrode assembly, the second insulating body constitutes at least part of the protruding structure, and along the arrangement direction of the electrode assembly and the first side wall, the maximum size of the second insulating body is equal to the size of the protruding structure. On the side of the insulating part facing the second side wall, the partial structure of the insulating part constituted by the second insulating body, since the melting point of the second insulating body is greater than the melting point of the first insulating body, the second insulating body can be used to block the heat on the second side wall, thereby reducing the problem of premature failure of the battery cell due to softening of the insulating part due to heat.

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 battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

For example, as shown in FIG1 , it is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. The vehicle 1000 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 300, a controller 200 and a battery device 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery device 100 to power the motor 300. For example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power demand during the start, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also 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.

The battery apparatus 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies 110 for providing voltage and capacity. The battery cell assembly 110 may include a plurality of battery cells 10, and the plurality of battery cells 10 are connected in series, in parallel or in mixed connection through a busbar component.

In some embodiments, a battery cell assembly 110 (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 10 .

As an example, the battery cell assembly 110 may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 10 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 10 by a cable tie.

In some embodiments, as shown in FIG. 2 , the battery device 100 may be a battery pack, which includes a case 120 and one or more battery cell assemblies 110 , wherein the battery cell assemblies 110 are accommodated in the case 120 .

As an example, the battery cell assembly 110 may be a battery module, and the battery cell assembly 110 may be accommodated in the case 120 by fixing the battery module in the case 120 .

As an example, the battery cell assembly 110 may also be accommodated in the case 120 by directly fixing the plurality of battery cells 10 to the case 120 .

As an example, the box 120 may include a first box 1201 and a second box 1202. The first box 1201 and the second box 1202 are buckled together to form a closed space inside the box 120 to accommodate the battery cell assembly 110. The closed space here means covering or closing, which may be sealed or unsealed. The first box 1201 may be a top cover or a bottom plate.

As an example, the box body 120 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 120 to accommodate the battery cell assembly 110.

In some embodiments, the box 120 may be a part of the chassis structure of the vehicle 1000. For example, a portion of the box 120 may become at least a part of the floor of the vehicle 1000, or a portion of the box 120 may become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 10, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

In some embodiments of the present application, the battery cell 10 may be a secondary battery. A secondary battery refers to a battery cell 10 that can be continuously used by activating active materials by charging after the battery cell 10 is discharged.

The battery cell 10 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

In some embodiments of the present application, as shown in Figures 3 to 25, a battery cell 10 is proposed, which includes a shell 11, a pressure relief mechanism 12, an electrode assembly 15 and an insulating member 14. The shell 11 includes a plurality of side walls, the plurality of side walls include a first side wall 1111 and a second side wall 1121 that are intersectingly arranged, among the plurality of side walls, the second side wall is the side wall with the largest area, the pressure relief mechanism is arranged on the first side wall 1111, the pressure relief mechanism 12 is configured to open or close according to the internal pressure of the shell 11, the electrode assembly 15 is arranged inside the shell 11, the insulating member 14 is arranged in the shell 11 and is insulated between the first side wall 1111 and the electrode assembly 15, and the first side wall 1111 and the electrode assembly 15 are respectively abutted against the insulating member 14. Among them, the insulating member 14 includes a first insulating body 141 and a second insulating body 142 respectively connected to the first side wall 1111, the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, and the side of the insulating member 14 facing the electrode assembly 15 includes at least the second insulating body 142, and the second insulating body 142 is configured to support the electrode assembly 15 when the first insulating body 141 is softened by heat.

In some embodiments, the housing 11 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, the housing 11 plays a role in protecting the electrode assembly 15, and a sealed bag is also included between the housing 11 and the electrode assembly 15, and the sealed bag is used to encapsulate the electrode assembly 15 and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member 14 or an aluminum-plastic film. When the housing 11 is a sealed structure, it is used to encapsulate components such as the electrode assembly 15 and the electrolyte.

As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in the present application.

The electrode assembly 15 includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO ₄ (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO ₄ ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO ₂ ), lithium nickel oxide (such as LiNiO ₂ ), lithium manganese oxide (such as LiMnO ₂ , LiMn ₂ O ₄ ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi _1/3 Co _1/3 Mn _1/3 O ₂ (also referred to as NCM ₃₃₃ ), LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (also referred to as NCM ₅₂₃ ), LiNi _0.5 Co _0.25 Mn _0.25 O ₂ (also referred to as NCM ₂₁₁ ), LiNi _0.6 Co _0.2 Mn _0.2 O ₂ (also referred to as NCM ₆₂₂ ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (also referred to as NCM 811 ), and LiNi _0.8 Co _0.2 Mn _0.2 O ₂ (also referred to as NCM ₈₁₁ ), lithium nickel cobalt aluminum oxide (such as LiNi _0.8 Co _0.15 Al _0.05 O ₂ ) and modified compounds thereof. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon. When the foamed metal is used as the positive electrode, the positive electrode active material may not be disposed on the surface of the foamed metal, but of course, the positive electrode active material may also be disposed. As an example, the positive electrode active material is filled or/and deposited in the foamed metal.

In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 10 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for the battery cell 10 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

As an example, a negative electrode active material may be filled and/or deposited in the negative electrode current collector.

In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

In some embodiments, the electrode assembly 15 further includes a separator, which is disposed between the positive electrode and the negative electrode.

In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic/inorganic composite coating can also be coated on the surface of the separator.

In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

The electrode assembly 15 may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

In some embodiments, the electrode assembly 15 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

In some embodiments, the electrode assembly 15 is a laminate structure.

As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

In some embodiments, the shape of the electrode assembly 15 can be cylindrical, flat, or polygonal.

In some embodiments, the electrode sheet of the electrode assembly 15 is provided with a tab, which can lead current out of the electrode assembly 15. The tab includes a positive tab and a negative tab.

In some embodiments, a pressure relief mechanism 12 is disposed on the housing 11 . The pressure relief mechanism 12 is used to discharge the internal gas of the battery cell 10 .

As an example, when the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 10 reaches a predetermined threshold, the pressure relief mechanism 12 performs an action or a weak structure provided in the pressure relief mechanism 12 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 10.

As an example, the pressure relief mechanism 12 may be formed integrally with the housing 11 .

As an example, the pressure relief mechanism 12 may also be separately provided and connected to the housing 11 .

The "actuation" mentioned in this application means that the pressure relief mechanism 12 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 10 can be released. The action produced by the pressure relief mechanism 12 may include but is not limited to: the components in the pressure relief mechanism 12 move to form an exhaust channel, at least a part of the pressure relief mechanism 12 ruptures, breaks, is torn or opened, and so on. When the pressure relief mechanism 12 is actuated, the high-temperature and high-pressure substances inside the battery cell 10 will be discharged from the actuated part as emissions. In this way, the battery cell 10 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

In some embodiments, when the housing 11 is a non-sealed structure, the pressure relief mechanism 12 can be configured as a through hole for discharging the gas inside the battery cell 10 .

The emissions from the battery cells 10 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, and the like.

The positive electrode tab and the negative electrode tab can be led out from the same end of the electrode sheet, or can be led out from opposite ends of the electrode sheet respectively.

The structures of the positive electrode tab and the negative electrode tab may be the same or different. Taking the positive electrode tab as an example, the positive electrode tab may include multiple positive electrode tab layers, and multiple positive electrode tab layers are stacked together to form the positive electrode tab. The positive electrode tab may include at least two parts, one part is located between the main body of the pole piece and the insulating member 14, and the other part is located between the insulating member 14 and the electrode lead-out member.

The insulating member 14 can insulate at least part of the tab from the end face of the main body, thereby reducing the risk of the tab being inserted into the main body when the battery cell 10 is affected by external impact, vibration, etc., thereby reducing the risk of short circuit of the battery cell 10 and helping to improve the reliability of the battery cell 10.

The insulating member 14 may be an integral structure or a split structure. As an example, the insulating member 14 is formed by connecting a plurality of independently formed parts. As another example, the insulating member 14 is integrally formed by extrusion.

In the present application, the insulating member 14 is a plastic member, and the insulating member 14 which is a plastic member is integrally formed by injection molding. The processing of the plastic member is convenient, and the manufacturing cost of the plastic member is low.

It should be understood that the melting point of the insulating member 14, which is a plastic part, is relatively low. When the adjacent battery cell 10 experiences thermal runaway, the high temperature is transferred to the insulating member 14, and the insulating member 14 softens. The softened insulating member 14 has reduced support performance for the electrode assembly 15. When the pressure relief mechanism 12 is opened, the electrode assembly 15 can move, thereby colliding with a sharp position on the insulating member 14. The sharp position on the insulating member 14 can pierce the electrode assembly 15, thereby causing the electrode assembly 15 to short-circuit.

In the present application, on the side of the insulating member 14 facing the second side wall 1121, the partial structure of the insulating member 14 constituted by the second insulating body 142, since the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, the second insulating body 142 can be used to block the heat on the second side wall 1121, thereby reducing the problem of premature failure of the battery cell 10 due to the softening of the insulating member 14 due to heat.

It should be pointed out that the first insulating body 141 and the second insulating body 142 are respectively connected to the first side wall 1111, that is, the first insulating body 141 and the second insulating body 142 are respectively directly connected to the first side wall 1111. In addition, when the second insulating body 142 is connected to the first side wall 1111, the second insulating body 142 can be connected to the first side wall 1111 through the outside of the first insulating body 141, and the second insulating body 142 can also be connected to the first side wall 1111 through the inside of the first insulating body 141.

A first through hole 1411 and a second through hole 1412 are provided on the first insulating body 141, wherein the first through hole 1411 allows the electrode terminal 13 to pass through and be electrically connected to the electrode assembly 15, and the second through hole 1412 is arranged opposite to the pressure relief mechanism 12, so that when the battery cell 10 is depressurized, the discharged material can pass through the second through hole 1412 and then be discharged through the pressure relief mechanism 12.

In some embodiments of the present application, as shown in Figures 6, 8, 10, 12, 14, 16, 18, 20, 22 and 23, the housing 11 includes a shell 112 and an end cover 111, the shell 112 has an opening, the end cover 111 is connected to the shell 112 and closes the opening, the end cover 111 constitutes a first side wall 1111, and the pressure relief mechanism 12 is arranged on the end cover 111.

Specifically, the housing 112 may be provided with one or more openings. One or more end caps 111 may also be provided. In addition, the connection between the end cap 111 and the housing 112 includes but is not limited to clamping, bonding, welding or connection via a connector.

In the present application, the outer shell 11 is configured to be composed of two parts, namely, a shell body 112 and an end cover 111 , and the pressure relief mechanism 12 is disposed on the end cover 111 , thereby improving the convenience of processing and assembly and effectively improving the production efficiency.

In some embodiments of the present application, as shown in Figures 6, 8, 10, 12, 14, 16, 18, 20 and 23, the end cover 111 is a metal part, and the battery cell 10 also includes an electrode terminal 13 and an insulating component 17. The electrode terminal 13 is arranged on the end cover 111 and is spaced apart from the pressure relief mechanism 12. The insulating component 17 is arranged between the electrode terminal 13 and the end cover 111 to insulate the electrode terminal 13 and the end cover 111.

Specifically, the electrode terminal 13 is electrically connected to the tab of the electrode assembly 15. The electrode terminal 13 may be directly connected to the tab, or indirectly connected to the tab through the current collecting member 16. The electrode terminal 13 may be disposed on the end cap 111, or may be disposed on the housing 112. In the embodiment shown in the present application, the electrode terminal 13 is disposed on the end cap 111.

In the present application, the end cap 111 is a metal part, which can increase the structural strength of the end cap 111 and improve the impact resistance of the battery cell 10. At the same time, when the end cap 111 is a metal part and the electrode terminal 13 is arranged on the end cap, an insulating component 17 is arranged between the electrode terminal 13 and the end cap 111, and the insulating component 17 insulates the electrode terminal 13 from the end cap 111. The insulating component 17 includes but is not limited to plastic or ceramic.

The electrode terminal 13 is disposed on the end cover 111 , and the electrode terminal 13 can be installed on the end cover 111 first and then the end cover 111 is connected to the housing 112 , thereby improving the convenience of assembly.

Insulating the electrode terminal 13 from the end cover 111 can reduce the possibility of short circuit between the electrode terminal 13 and the end cover 111 , thereby improving the safety performance of the battery cell 10 .

The electrode terminal 13 and the pressure relief mechanism 12 are spaced apart to reduce interference between the electrode terminal 13 and the pressure relief mechanism 12 , thereby reducing the functional limitation caused by structural interference (for example, the pressure relief mechanism 12 cannot be opened due to interference from the electrode terminal 13 ).

In some embodiments of the present application, when the volume energy density of the second insulating body 142 is less than 390Wh/L, the melting point of the second insulating body 142 is greater than or equal to 150°C.

Specifically, the second insulating body 142 is configured so that when the volume energy density is less than 390Wh/L, the melting point of the second insulating body 142 is greater than or equal to 150°C, so that the second insulating body 142 can adapt to the current energy density of the battery cell 10, thereby improving the heat insulation capacity of the second side wall 1121, and further reducing the problem of premature failure of the battery cell 10 due to the softening of the insulating part 14 due to heat.

It should be pointed out that the melting point of the second insulating body 142 may specifically be 150° C., 160° C., 170° C., 180° C., 190° C., etc.

In some embodiments of the present application, when the volume energy density of the second insulating body 142 is greater than or equal to 390Wh/L, the melting point of the second insulating body 142 is greater than or equal to 200°C.

Specifically, the second insulating body 142 is configured to have a melting point greater than or equal to 200°C when the volume energy density is greater than or equal to 390Wh/L, so that the second insulating body 142 can adapt to the current energy density of the battery cell 10, thereby improving the heat insulation capacity of the second side wall 1121, and further reducing the problem of premature failure of the battery cell 10 due to the softening of the insulating part 14 due to heat.

It should be pointed out that the melting point of the second insulating body 142 may specifically be 200° C., 210° C., 220° C., 230° C., 240° C., etc.

In some embodiments of the present application, as shown in Figures 6, 8, 10, 12, 14, 16, 18, 20 and 23, the side of the insulating member 14 facing the second side wall 1121 includes at least a second insulating body 142, the number of the second side walls 1121 is two, the two second side walls 1121 are arranged in parallel and spaced apart, and the insulating member 14 includes a second insulating body 142 on both sides facing the two second side walls 1121, respectively.

Specifically, the housing 11 includes an end cap 111 and a shell 112. The end cap 111 constitutes a first side wall 1111. Two second side walls 1121 are formed on the shell 112, and the two second side walls 1121 are arranged in parallel and spaced apart. The end cap 111 constituting the first side wall 1111 is arranged to intersect the two second side walls 1121 perpendicularly. The electrode assembly 15 and the insulating member 14 are respectively arranged in the shell 112, the pressure relief mechanism 12 and the electrode terminal 13 are respectively arranged on the end cap 111, the electrode terminal 13 is electrically connected to the electrode assembly 15, the insulating member 14 insulates the end cap 111 from the electrode assembly 15, and the insulating member 14 is respectively arranged to abut against the end cap 111 and the electrode assembly 15.

The battery cell 10 has a need for heat exchange during use (for example, the battery cell 10 needs to be heated in a low temperature environment, and the temperature of the battery cell 10 needs to be lowered when the temperature of the battery cell 10 is high). When the battery cell 10 is heat exchanged, it can be achieved through natural air cooling or by connecting the battery cell 10 to a heat exchange component.

The second side wall 1121 is the side wall with the largest area among the multiple side walls of the housing 11 . At this time, heat exchange between the second side wall 1121 and the battery cell 10 can be improved to improve the heat exchange efficiency of the battery cell 10 .

In the present application, two second side walls 1121 are provided so that the battery cells 10 can exchange heat through the two second side walls 1121 , thereby improving the heat exchange efficiency of the battery cells 10 .

In some embodiments of the present application, as shown in Figures 7, 9, 11, 13, 15, 17, 19, 21, 22, 24 and 25, the side of the insulating member 14 facing the electrode assembly 15 includes a protruding structure, the protruding structure abuts against the electrode assembly 15, and the second insulating body 142 constitutes at least a portion of the protruding structure. Along the arrangement direction of the electrode assembly 15 and the first side wall 1111, the maximum size of the second insulating body 142 is equal to the size of the protruding structure.

Specifically, the raised structure of the insulating member 14 abuts against the electrode assembly 15. When the insulating member 14 is heated, since the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, when the first insulating body 141 is softened by heat, the second insulating body 142 does not soften. The second insulating body 142 is used to form at least a portion of the raised structure, thereby providing good support for the electrode assembly 15, thereby reducing the movement of the electrode assembly 15 during the pressure relief process of the pressure relief mechanism 12, and further reducing the short circuit of the electrode assembly 15 caused by the sharp position on the insulating member 14 piercing the electrode assembly 15 due to the movement of the electrode assembly 15.

It should be understood that the protruding structure is arranged to protrude relative to the side of the insulating member 14 facing the electrode assembly 15 .

The shape of the protrusion structure includes but is not limited to a cylinder or a prism.

In addition, in the present application, the protrusion structure may be partially formed by the second insulating body 142 , or may be entirely formed by the second insulating body 142 .

In some embodiments of the present application, as shown in Figures 7, 9, 11, 15, 17, 19, 21, 22, 24 and 25, at least a portion of the end of the protrusion structure facing the second side wall 1121 is formed by a second insulating body 142.

Specifically, the housing 11 includes an end cap 111 and a shell 112. The end cap 111 constitutes a first side wall 1111. The second side wall 1121 is formed on the shell 112. The end cap 111 and the second side wall 1121 constituting the first side wall 1111 are arranged to intersect each other vertically. The electrode assembly 15 and the insulating member 14 are respectively arranged in the shell 112. The pressure relief mechanism 12 and the electrode terminal 13 are respectively arranged on the end cap 111. The electrode terminal 13 is electrically connected to the electrode assembly 15. The insulating member 14 insulates the end cap 111 from the electrode assembly 15, and the protruding structure of the insulating member 14 abuts against the electrode assembly 15.

In the battery device 100, when thermal runaway occurs in an adjacent battery cell 10, heat will be transferred outward through the second side wall 1121 of the battery cell 10 that has thermal runaway, and heat will be transferred to the inside of the battery that has not experienced thermal runaway through the second side wall 1121 of the battery cell 10 that has not experienced thermal runaway. At least part of the end of the protruding structure facing the second side wall 1121 is formed by a second insulating body 142, and the second insulating body 142 is used to block the heat, thereby reducing the influence of heat on the insulating member 14, and further reducing the softening of the insulating member 14, so that the protruding structure can provide good support for the electrode assembly 15, reduce the movement of the electrode assembly 15 during the pressure relief process of the pressure relief mechanism 12, and also reduce the short circuit of the electrode assembly 15 caused by the sharp position on the insulating member 14 piercing the electrode assembly 15 due to the movement of the electrode assembly 15.

It should be pointed out that the protruding structure is jointly constituted by the first insulating body 141 and the second insulating body 142, wherein the end of the protruding structure facing the second side wall 1121 can be jointly constituted by the first insulating body 141 and the second insulating body 142, or can be constituted only by the second insulating body 142, the second insulating body 142 can be connected to the first side wall 1111 through the outer side of the first insulating body 141, and the second insulating body 142 can also be connected to the first side wall 1111 after passing through the through hole on the first insulating body.

As shown in FIG. 9 , FIG. 11 , FIG. 13 or FIG. 15 , a receiving structure 1414 (such as a groove structure, etc.) is provided on the first insulating body 141 , and the receiving structure 1414 can be arranged on a convex body 1413 of the first insulating body 141 constituting a convex structure, and the second insulating body 142 is accommodated and arranged by the receiving structure 1414 (the second insulating body 142 structurally supplements the position of the receiving structure 1414, that is, the second insulating body 142 is arranged flush with the surface of the first insulating body 141 ), thereby reducing the space occupied by the second insulating body 142 to reduce the impact on the energy density of the battery cell 10, and at the same time increasing the contact area between the first insulating body 141 and the second insulating body 142, thereby improving the connection strength and stability between the first insulating body 141 and the second insulating body 142.

In some embodiments of the present application, as shown in FIG. 7 , FIG. 9 , or FIG. 13 , a side of the first insulating body 141 facing the second side wall 1121 is connected to the second insulating body 142 .

Specifically, during the assembly process, the side of the first insulating body 141 facing the second side wall 1121 is connected to the second insulating body 142, so as to facilitate the control of the connection position during the assembly process, thereby improving the convenience and accuracy of assembly, thereby improving the efficiency of assembly and increasing the production cycle.

It should be noted that, in the present embodiment, the second insulating body 142 is a block structure, and the second insulating body 142 may be disposed only at a corner position of the first insulating body 141 , or the second insulating body 142 may be disposed side by side with the first insulating body 141 .

In addition, the second insulating body 142 may also pass through the through hole on the first insulating body and be connected to the first side wall 1111 .

In some embodiments of the present application, as shown in FIG. 16 and FIG. 19 , a side of the first insulating body 141 facing the electrode assembly 15 is connected to the second insulating body 142 .

Specifically, during the assembly process, the side of the first insulating body 141 facing the electrode assembly 15 is connected to the second insulating body 142, so as to facilitate the control of the connection position during the assembly process, thereby improving the convenience and accuracy of assembly, thereby improving the efficiency of assembly and increasing the production cycle.

It should be noted that, in this embodiment, the second insulating body 142 is an L-shaped structure, and the second insulating body 142 covers the corner position of the first insulating body 141 .

In addition, the second insulating body 142 may be connected to the first side wall 1111 through the outer side of the first insulating body 141 , or the second insulating body 142 may be connected to the first side wall 1111 after passing through a through hole on the first insulating body.

In some embodiments of the present application, the side of the first insulating body 141 facing the electrode assembly 15 and the side of the first insulating body 141 facing the second side wall 1121 are respectively connected to the second insulating body 142. In this way, the contact area between the first insulating body 141 and the second insulating body 142 is increased, so that the strength of the connection position is effectively improved.

It should be noted that, in this embodiment, the second insulating body 142 is an L-shaped structure, and the second insulating body 142 covers the corner position of the first insulating body 141 .

In addition, the second insulating body 142 may be connected to the first side wall 1111 through the outer side of the first insulating body 141 , or the second insulating body 142 may be connected to the first side wall 1111 after passing through a through hole on the first insulating body.

In some embodiments of the present application, the connection between the first insulating body 141 and the second insulating body 142 includes clamping, welding, bonding or connection via a connector. Such a configuration can facilitate processing, thereby improving processing efficiency.

For example, a first connection structure is provided on the first insulating body 141, and a second connection structure is provided on the second insulating body 142. The first connection structure and the second connection structure are matched in a concave-convex manner and are fixed at the matched position by snapping.

For another example, the first insulating body 141 and the second insulating body 142 are fixed by hot melting.

In some embodiments of the present application, as shown in FIG. 16 and FIG. 17 , the first insulating body 141 and the second insulating body 142 are respectively connected to the end cover 111 , and the second insulating body 142 constitutes the entire structure of the protruding structure.

Specifically, the first insulating body 141 and the second insulating body 142 are independent structures, and both are respectively connected and fixed to the end cover 111. By setting the first insulating body 141 and the second insulating body 142, there is no corresponding connection structure between the first insulating body 141 and the second insulating body 142, thereby reducing the assembly process and improving the assembly efficiency.

In addition, the first insulating body 141 and the second insulating body 142 are respectively connected to the end cover 111, and the second insulating body 142 constitutes the entire structure of the protruding structure. The second insulating body 142 can be used to block the heat transfer between the second side wall 1121 and the first insulating body 141, thereby improving the temperature resistance of the insulating part 14 and reducing the softening of the insulating part 14.

In some embodiments of the present application, as shown in FIG. 16 and FIG. 17 , the side of the first insulating body 141 facing the electrode assembly 15 is connected to the second insulating body 142 , and the second insulating body 142 constitutes the entire structure of the protruding structure.

Specifically, the side of the first insulating body 141 facing the electrode assembly 15 is connected to the second insulating body 142, and the second insulating body 142 constitutes the entire structure of the protruding structure. The second insulating body 142 constitutes the entire structure of the protruding structure, which can enable the insulating part 14 to have good supporting performance for the electrode assembly 15, reduce the movement of the electrode assembly 15 when the pressure relief mechanism 12 releases pressure, and further reduce the situation where the electrode assembly 15 is punctured by the insulating part 14 due to the movement.

In addition, the second insulating body 142 may be connected to the first side wall 1111 through the outer side of the first insulating body 141 , or the second insulating body 142 may be connected to the first side wall 1111 after passing through a through hole on the first insulating body.

In some embodiments of the present application, as shown in FIGS. 20 to 25 , the first insulating body 141 includes a protruding body 1413 , and the second insulating body 142 is disposed at one end of the protruding body 1413 facing the electrode assembly 15 and abuts against the electrode assembly 15 .

Specifically, the second insulating body 142 is utilized to reduce the temperature resistance of the insulating member 14 and reduce the softening due to heat, thereby improving the support performance of the electrode assembly 15 and reducing the movement of the electrode assembly 15 when the pressure relief mechanism 12 releases pressure, thereby reducing the situation where the electrode assembly 15 is punctured by the insulating member 14 due to movement.

It should be understood that, on the side facing the second side wall 1121 , the second insulating body 142 may be covered by the first insulating body 141 , and the second insulating body 142 may also be arranged flush with the first insulating body 141 .

In addition, the second insulating body 142 may also pass through the through hole on the first insulating body and be connected to the first side wall 1111 .

In some embodiments of the present application, a receiving groove is provided on a side of the protruding body 1413 facing the electrode assembly 15 , and at least a portion of the second insulating body 142 is provided in the receiving groove.

Specifically, the receiving groove is used to receive at least a portion of the structure of the second insulating body 142 , thereby reducing the occupation of the internal space of the battery cell 10 and reducing the impact on the energy density of the battery cell 10 .

In addition, the second insulating body 142 may also pass through the through hole on the first insulating body and be connected to the first side wall 1111 .

In some embodiments of the present application, as shown in FIGS. 20 to 22 , the second insulating body 142 is flush with the notch of the receiving groove, and the protruding body 1413 and the second insulating body 142 are respectively in contact with the electrode assembly 15 .

Such a configuration can increase the contact area between the first insulating body 141 and the second insulating body 142 , thereby improving the fixing strength and stability of the first insulating body 141 and the second insulating body 142 .

In some embodiments of the present application, as shown in FIGS. 23 to 25 , the protruding body 1413 closes the notch of the receiving groove, and the protruding body 1413 abuts against the electrode assembly 15 through the second insulating body 142 .

Such a configuration can increase the contact area between the first insulating body 141 and the second insulating body 142 , thereby improving the fixing strength and stability of the first insulating body 141 and the second insulating body 142 .

In addition, the second insulating body 142 may also pass through the through hole on the first insulating body and be connected to the first side wall 1111 .

In some embodiments of the present application, the connection between the protruding body 1413 and the second insulating body 142 includes snap-on connection, welding, bonding, or connection via a connector.

Specifically, the connection between the protruding body 1413 and the second insulating body 142 is configured to include snap connection, welding, bonding or connection via a connecting piece, which can facilitate processing and thus improve processing efficiency.

In some embodiments of the present application, as shown in Figures 12 and 13, the side of the insulating member 14 facing the electrode assembly 15 includes a protruding structure, the protruding structure abuts against the electrode assembly 15, and the protruding structure is formed on the first insulating body 141. The battery cell 10 also includes a current collecting member 16, and the electrode terminal 13 is electrically connected to the electrode assembly 15 through the current collecting member 16. At least a portion of the second insulating body 142 is arranged between the current collecting member 16 and the end cover 111.

Specifically, the second insulating body 142 can be used to insulate the end cover 111 from the current collecting member 16 , thereby reducing the possibility of overlapping and short-circuiting the end cover 111 and the current collecting member 16 due to softening of the insulating member 14 .

In some embodiments of the present application, the connection between the first insulating body 141 and the second insulating body 142 includes clamping, welding, bonding or connection via a connector. Such a configuration can facilitate processing, thereby improving processing efficiency.

For example, a first connection structure is provided on the first insulating body 141, and a second connection structure is provided on the second insulating body 142. The first connection structure and the second connection structure are matched in a concave-convex manner and are fixed at the matched position by snapping.

For another example, the first insulating body 141 and the second insulating body 142 are fixed by hot melting.

In some embodiments of the present application, as shown in FIG. 3 , along the arrangement direction of the electrode assembly 15 and the first side wall 1111 , the second insulating body 142 includes a first dimension L1 (as shown in FIG. 3 , in FIG. 3 , the arrangement direction along the electrode assembly 15 and the first side wall 1111 is consistent with the second direction Y), and the first dimension L1 is greater than or equal to 0.05 mm and less than or equal to 6 mm.

Specifically, the housing 11 includes an end cap 111 and a shell 112. The end cap 111 constitutes a first side wall 1111. The second side wall 1121 is formed on the shell 112. The end cap 111 and the second side wall 1121 constituting the first side wall 1111 are arranged to intersect each other vertically. The electrode assembly 15 and the insulating member 14 are respectively arranged in the shell 112. The pressure relief mechanism 12 and the electrode terminal 13 are respectively arranged on the end cap 111. The electrode terminal 13 is electrically connected to the electrode assembly 15. The insulating member 14 insulates the end cap 111 from the electrode assembly 15, and the insulating member 14 is respectively arranged to abut against the end cap 111 and the electrode assembly 15.

In the arrangement direction of the electrode assembly 15 and the first side wall 1111, the first dimension L1 of the second insulating body 142 is set, so that the second insulating body 142 can have good thermal insulation performance for the second side wall 1121, and the volume of the second insulating body 142 can be effectively controlled, thereby reducing the manufacturing cost of the insulating member 14.

It should be pointed out that the first size L1 can specifically be 0.05 mm, 0.09 mm, 1.4 mm, 2.1 mm, 2.4 mm, 3.1 mm, 3.4 mm, 4.1 mm, 4.4 mm, 5.1 mm, 5.4 mm, or 6 mm.

In some embodiments of the present application, as shown in FIG. 3 , the first dimension L1 is greater than or equal to 0.1 mm and less than or equal to 4 mm.

Specifically, setting the first dimension L1 to be greater than or equal to 0.1 mm and less than or equal to 4 mm can further control the volume of the second insulating body 142 on the basis of the second insulating body 142 having good thermal insulation performance for the second side wall 1121, thereby reducing the manufacturing cost of the insulating member 14.

It should be noted that the first size L1 can specifically be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or 2 mm.

In some embodiments of the present application, the second insulating body 142 includes at least one of PP, PET, PFA and PI.

Specifically, in this application, PP refers to polypropylene, which is a semi-crystalline thermoplastic with a melting point ≥150°C.

PET refers to polyethylene terephthalate, commonly known as polyester resin. It is the most important type of thermoplastic polyester and its melting point is ≥250℃.

PFA refers to tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (Polyfluoroalkoxy), and its melting point is ≥300°C.

PI is the abbreviation of polyimide, which is a high-performance organic polymer with a melting point ≥300°C.

In the present application, the second insulating body 142 is configured to include at least one of PP, PET, PFA and PI, and the second insulating body 142 can be configured according to the battery cell 10, thereby improving flexibility in the manufacturing process.

In some embodiments of the present application, as shown in FIG. 4 , along the arrangement direction of the electrode assembly 15 and the second side wall 1121 (as shown in FIG. 4 , in FIG. 4 , the arrangement direction of the electrode assembly 15 and the second side wall 1121 is consistent with the first direction X), the second insulating body 142 includes a second dimension L2, and the second dimension L2 is greater than or equal to 3 mm and less than or equal to 50 mm.

Specifically, the second dimension L2 of the second insulating body 142 is set so that the second insulating body 142 has a sufficient size in the arrangement direction of the electrode assembly 15 and the second side wall 1121, so that the second insulating body 142 has good temperature resistance, and can reduce the occupancy of the internal space of the battery cell 10 on the basis of providing good support for the motor assembly, thereby reducing the impact on the energy density of the battery cell 10.

It should be pointed out that the second size L2 can specifically be 3 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 21 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 31 mm, 32 mm, 34 mm, 36 mm, 38 mm, 40 mm, 41 mm, 42 mm, 44 mm, 46 mm, 48 mm, or 50 mm.

In some embodiments of the present application, as shown in FIG4 , the second dimension L2 is greater than or equal to 5 mm and less than or equal to 35 mm. Specifically, the second dimension L2 of the second insulating body 142 is set so that the second insulating body 142 has a sufficient size in the arrangement direction of the electrode assembly 15 and the second side wall 1121, so that the second insulating body 142 has good temperature resistance, and on the basis of being able to provide good support for the motor assembly, the internal space occupied by the battery cell 10 is reduced, thereby reducing the impact on the energy density of the battery cell 10.

It should be pointed out that the second size L2 can specifically be 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 17 mm, 19 mm, 20 mm, 21 mm, 23 mm, 25 mm, 27 mm, 29 mm, 30 mm, 31 mm, 33 mm, or 35 mm.

As shown in FIG. 2 to FIG. 25 , a second aspect of the present application provides a battery device 100 . The battery device 100 includes at least one battery cell 10 . The battery cell 10 is the battery cell 10 described above.

In the battery device 100, inside the battery cell 10, on the side of the insulating member 14 facing the second side wall 1121, the second insulating body 142 constitutes a partial structure of the insulating member 14. Since the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, the second insulating body 142 can be used to block the heat on the second side wall 1121, thereby reducing the problem of premature failure of the battery cell 10 due to softening of the insulating member 14 due to heat.

As shown in FIG. 1 to FIG. 25 , the third aspect of the present application proposes an electrical device, which includes the battery device 100 as described above.

In the electrical equipment, inside the battery cell 10 of the battery device 100, on the side of the insulating part 14 facing the second side wall 1121, the partial structure of the insulating part 14 constituted by the second insulating body 142, since the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, the second insulating body 142 can be used to block the heat on the second side wall 1121, thereby reducing the problem of premature failure of the battery cell 10 due to the softening of the insulating part 14 due to heat.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

In an embodiment of the present application, as shown in Figures 3 to 25, the present application proposes a battery cell 10, the battery cell 10 includes a shell 11, a pressure relief mechanism 12, an electrode assembly 15 and an insulating member 14, the shell 11 includes a plurality of side walls, the plurality of side walls include a first side wall 1111 and a second side wall 1121 that are intersectingly arranged, among the plurality of side walls, the second side wall 1121 is the side wall with the largest area, the pressure relief mechanism 12 is arranged on the first side wall 1111, the pressure relief mechanism 12 is configured to open or close according to the internal pressure of the shell 11, the electrode assembly 15 is arranged inside the shell 11, the insulating member 14 is arranged in the shell 11 and is insulated between the first side wall 1111 and the electrode assembly 15, and the first side wall 1111 and the electrode assembly 15 are respectively abutted against the insulating member 14. Among them, the insulating member 14 includes a first insulating body 141 and a second insulating body 142 respectively connected to the first side wall 1111, the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, and the side of the insulating member 14 facing the second side wall 1121 includes at least the second insulating body 142, and the second insulating body 142 is configured to support the electrode assembly 15 when the first insulating body 141 is softened by heat.

Specifically, on the side of the insulating part 14 facing the second side wall 1121, the partial structure of the insulating part 14 constituted by the second insulating body 142, since the melting point of the second insulating body 142 is greater than the melting point of the first insulating body 141, the second insulating body 142 can be used to block the heat on the second side wall 1121, thereby reducing the problem of premature failure of the battery cell 10 due to the softening of the insulating part 14 due to heat.

Furthermore, the housing 11 includes a shell 112 and an end cover 111, the shell 112 has an opening, the end cover 111 is connected to the shell 112 and closes the opening, the end cover 111 constitutes a first side wall 1111, and the pressure relief mechanism 12 is arranged on the end cover 111. The end cover 111 is a metal part, and the battery cell 10 also includes an electrode terminal 13, the electrode terminal 13 is arranged on the end cover 111, and the electrode terminal 13 is insulated from the end cover 111 and spaced from the pressure relief mechanism 12.

Furthermore, when the volume energy density of the second insulating body 142 is less than 390Wh/L, the melting point of the second insulating body 142 is greater than or equal to 150°C; when the volume energy density of the second insulating body 142 is greater than or equal to 390Wh/L, the melting point of the second insulating body 142 is greater than or equal to 200°C.

Furthermore, the insulating member 14 includes at least a second insulating body 142 on one side facing the second side wall 1121 . There are two second side walls 1121 , which are arranged in parallel and spaced apart. The insulating member 14 includes a second insulating body 142 on both sides facing the two second side walls 1121 .

Further, the side of the insulating member 14 facing the electrode assembly 15 includes a protruding structure, the protruding structure abuts against the electrode assembly 15, and the second insulating body 142 constitutes at least part of the protruding structure. Along the arrangement direction of the electrode assembly 15 and the first side wall 1111, the maximum size of the second insulating body 142 is equal to the size of the protruding structure. At least part of the end of the protruding structure facing the second side wall 1121 is formed by the second insulating body 142. In this way, the heat of the second side wall 1121 can be blocked by the second insulating body 142, which reduces the softening of the protruding structure due to heat, so that the supporting performance of the protruding structure for the electrode assembly 15 is effectively improved. The side of the first insulating body 141 facing the second side wall 1121 is connected to the second insulating body 142, or the side of the first insulating body 141 facing the electrode assembly 15 is connected to the second insulating body 142. The connection method between the first insulating body 141 and the second insulating body 142 includes clamping, welding, bonding or connection via a connector.

In some examples, the first insulating body 141 and the second insulating body 142 are respectively connected to the end cover 111 , and the second insulating body 142 constitutes the entire structure of the protruding structure.

In some examples, a side of the first insulating body 141 facing the electrode assembly 15 is connected to the second insulating body 142 , and the second insulating body 142 constitutes the entire structure of the protruding structure.

In some examples, the first insulating body 141 includes a protruding body 1413 , and the second insulating body 142 is disposed at one end of the protruding body 1413 facing the electrode assembly 15 and abuts against the electrode assembly 15 .

In some examples, a receiving groove is provided on one side of the protruding body 1413 facing the electrode assembly 15, and at least a portion of the second insulating body 142 is provided in the receiving groove. The second insulating body 142 is arranged flush with the notch of the receiving groove, and the protruding body 1413 and the second insulating body 142 are respectively abutted against the electrode assembly 15, the protruding body 1413 closes the notch of the receiving groove, and the protruding body 1413 abuts against the electrode assembly 15 through the second insulating body 142.

Furthermore, the connection between the protruding body 1413 and the second insulating body 142 includes clamping, welding, bonding or connection via a connecting piece. Such a configuration can facilitate processing, thereby improving processing efficiency.

In some examples, the side of the insulating member 14 facing the electrode assembly 15 includes a protruding structure, the protruding structure abuts against the electrode assembly 15, the protruding structure is formed on the first insulating body 141, the battery cell 10 also includes a current collecting member 16, the electrode terminal 13 is electrically connected to the electrode assembly 15 through the current collecting member 16, and at least part of the second insulating body 142 is disposed between the current collecting member 16 and the end cap 111. The connection between the first insulating body 141 and the second insulating body 142 includes clamping, welding, bonding, or connection via a connector.

Furthermore, along the arrangement direction of the electrode assembly 15 and the first side wall 1111 , the second insulating body 142 includes a first size L1 , and the first size L1 is greater than or equal to 0.1 mm and less than or equal to 4 mm.

Further, the material of the second insulating body 142 includes at least one of PP, PET, PFA and PI.

Furthermore, along the arrangement direction of the electrode assembly 15 and the second side wall 1121 , the second insulating body 142 includes a second size L2 , and the second size L2 is greater than or equal to 5 mm and less than or equal to 35 mm.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims (20)

1. A battery cell, the battery cell comprising:

The shell comprises a plurality of side walls, wherein the side walls comprise a first side wall and a second side wall which are arranged in an intersecting mode, and the second side wall is the side wall with the largest area;

a pressure relief mechanism provided to the first side wall, the pressure relief mechanism configured to open or close according to an internal pressure of the housing;

an electrode assembly disposed inside the case;

The insulating piece is arranged in the shell and is arranged between the first side wall and the electrode assembly in an insulating way, and the first side wall and the electrode assembly are respectively abutted against the insulating piece;

The insulating part comprises a first insulating body and a second insulating body which are respectively connected with the first side wall, the melting point of the second insulating body is larger than that of the first insulating body, one side, facing the electrode assembly, of the insulating part at least comprises the second insulating body, the second insulating body is arranged to support the electrode assembly when the first insulating body is heated and softened, one side, facing the electrode assembly, of the insulating part comprises a protruding structure, the protruding structure is abutted to the electrode assembly, at least part of the second insulating body is formed into the protruding structure, the second insulating body is arranged along the arrangement direction of the electrode assembly and the first side wall, and the maximum size of the second insulating body is equal to the size of the protruding structure.

2. The battery cell of claim 1, wherein the housing comprises:

a housing having an opening;

the end cover is connected with the shell and seals the opening, the end cover forms the first side wall, and the pressure release mechanism is arranged on the end cover.

3. The battery cell of claim 2, wherein the end cap is a metal piece, the battery cell further comprising an electrode terminal disposed on the end cap and spaced from the pressure relief mechanism, and an insulating member disposed between the electrode terminal and the end cap to insulate the electrode terminal from the end cap.

4. The battery cell according to claim 1, wherein when the volumetric energy density of the second insulating body is less than 390Wh/L, the melting point of the second insulating body is 150 ℃ or more;

And/or, when the volume energy density of the second insulating body is greater than or equal to 390Wh/L, the melting point of the second insulating body is greater than or equal to 200 ℃.

5. The battery cell as defined in claim 1, wherein a side of the insulating member facing the second side wall includes at least the second insulating body, the number of the second side walls is two, the two second side walls are arranged in parallel and spaced apart, and both sides of the insulating member facing the two second side walls include the second insulating body respectively.

6. The battery cell of claim 1, wherein at least a portion of an end of the projection structure facing the second sidewall is formed by the second insulative body.

7. The battery cell of claim 1, wherein a side of the first insulating body facing the second sidewall is connected to the second insulating body;

and/or, a side of the first insulating body facing the electrode assembly is connected to the second insulating body.

8. The battery cell as defined in claim 1, wherein a side of the first insulating body facing the electrode assembly is connected to the second insulating body, the second insulating body constituting the entire structure of the protrusion structure.

9. The battery cell as recited in claim 1, wherein the first insulator body comprises a raised body and the second insulator body is disposed at an end of the raised body facing the electrode assembly and abutting the electrode assembly.

10. The battery cell as recited in claim 9, wherein a side of the protrusion body facing the electrode assembly is provided with a receiving groove, and at least a portion of the second insulative body is disposed in the receiving groove.

11. The battery cell as defined in claim 10, wherein the second insulating body is disposed flush with the notch of the receiving groove, and the protruding body and the second insulating body are respectively abutted against the electrode assembly;

Or the second insulating body seals the notch of the accommodating groove, and the protruding body is abutted against the electrode assembly through the second insulating body.

12. The battery cell of claim 10, wherein the connection between the protruding body and the second insulating body comprises a snap fit, a weld, an adhesive, or a connection via a connector.

13. The battery cell of claim 7, wherein the connection between the first and second insulative bodies comprises a snap fit, a weld, an adhesive, or a connection via a connector.

14. The battery cell according to any one of claims 1 to 13, wherein the second insulating body includes a first dimension in an arrangement direction of the electrode assembly and the first side wall, the first dimension being 0.05 mm or more and 6 mm or less.

15. The battery cell of claim 14, wherein the first dimension is 0.1 millimeters or greater and 4 millimeters or less.

16. The battery cell of any one of claims 1 to 13, wherein the material of the second insulator comprises at least one of polypropylene, polyethylene terephthalate, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, and polyimide.

17. The battery cell according to any one of claims 1 to 13, wherein the second insulating body includes a second dimension in an arrangement direction of the electrode assembly and the second side wall, the second dimension being 3mm or more and 50 mm or less.

18. The battery cell of claim 17, wherein the second dimension is 5 millimeters or greater and 35 millimeters or less.

19. A battery device, characterized in that it comprises at least one battery cell according to any one of claims 1 to 18.

20. A powered device comprising a battery arrangement according to claim 19.