Battery cell, battery device and electric device

Abstract

The embodiment of the utility model discloses a battery monomer, a battery device and a power utilization device, which can enhance the bearing capacity of an insulating part and further effectively reduce the probability that the insulating part is torn and damaged. The battery cell includes: a case; the electrode assembly is accommodated in the shell; the insulating part is arranged between the shell and the electrode assembly and used for wrapping the electrode assembly, one side, facing the electrode assembly, of the insulating part is provided with a reinforcing part, the reinforcing part is arranged in a first area of the insulating part, and the first area is an area corresponding to a corner area of the electrode assembly.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device and an electrical device. Background Art

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

[0003] The battery includes a battery cell. During the manufacturing process of the battery cell, an insulating film needs to be coated on the outer surface of the electrode assembly to prevent a short circuit between the electrode assembly and the battery cell shell. The performance of the insulating film will directly affect the performance of the battery cell and the battery. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery device, and an electrical device, which can enhance the load-bearing capacity of the insulating component, thereby effectively reducing the probability of tearing and damage of the insulating component.

[0005] In a first aspect, a battery cell is provided, comprising: a shell; an electrode assembly accommodated in the shell; an insulating member arranged between the shell and the electrode assembly and used to cover the electrode assembly, wherein a reinforcing member is arranged on a side of the insulating member facing the electrode assembly, and the reinforcing member is arranged in a first area of ​​the insulating member, and the first area is an area corresponding to a corner area of ​​the electrode assembly.

[0006] In the embodiment of the present application, a reinforcing member is provided on the insulating member to enhance the bearing capacity of the insulating member. Thus, during the processing or use of the battery cell, when the impact force of the electrode assembly acts on the insulating member, the reinforced insulating member can bear the impact force, thereby significantly reducing the probability of the insulating member being torn or damaged.

[0007] Furthermore, since the gap between the insulating part and the electrode assembly is usually larger than the gap between the insulating part and the shell, and the gap between the insulating part and the corner area of ​​the electrode assembly is usually larger than the gap between the insulating part and other areas, setting the reinforcement part in the area of ​​the insulating part corresponding to the corner area of ​​the electrode assembly can greatly reduce the internal space of the battery cell occupied by the reinforcement part, thereby effectively improving the energy density of the battery cell.

[0008] In some possible embodiments, the first cross-sectional area is 1 / 4-1 / 2 of the second cross-sectional area, wherein the first cross-sectional area is the cross-sectional area of ​​the reinforcement in a direction parallel to the opening of the shell, and the second cross-sectional area is the cross-sectional area of ​​the insulating member in a direction parallel to the opening.

[0009] The above technical solution sets the first cross-sectional area to 1 / 4-1 / 2 of the second cross-sectional area, which can balance the two aspects of the reinforcement and force balance of the insulating member, thereby effectively improving the performance of the insulating member and the battery cell.

[0010] In some possible embodiments, the reinforcing member is disposed at the bottom of the insulating member. In this way, the bearing capacity of the bottom of the insulating member can be effectively enhanced. In this way, when the impact force of the electrode assembly acts on the bottom of the insulating member during the processing or use of the battery cell, the insulating member with the bottom reinforced can bear the impact force, so that the probability of the insulating member being torn or damaged can be significantly reduced.

[0011] In some possible embodiments, the reinforcement member is disposed at two opposite ends of the bottom of the insulating member along the length direction.

[0012] In some possible embodiments, the first thickness is greater than the second thickness, the first thickness is the thickness of at least a portion of the bottom, and the second thickness is the thickness of other regions of the insulating member except the at least a portion of the bottom.

[0013] The above technical solution sets the thickness of at least part of the bottom area of ​​the insulating member to be greater than the thickness of other areas of the insulating member, which is equivalent to strengthening the bottom of the insulating member, thereby further enhancing the bearing capacity of the insulating member.

[0014] In some possible embodiments, at least one through hole for electrolyte circulation is provided at the bottom of the insulating member, so that the normal circulation of the electrolyte can be ensured, thereby ensuring the normal operation of the battery cell.

[0015] In some possible embodiments, the damping between the insulating member and the shell is greater than the damping between the insulating member and the electrode assembly.

[0016] The above technical solution can buffer the falling impact force of the electrode assembly when entering the shell by increasing the damping between the insulating part and the shell, so as to reduce the load on the insulating part, thereby reducing the possibility of tearing and damage of the insulating part.

[0017] In some possible embodiments, the shell includes a side wall, and a surface of the side wall facing the insulating member is coated with an adhesive material; and / or a side surface of the insulating member facing the shell is coated with an adhesive material.

[0018] In the above technical solution, the surface of the side wall of the shell facing the insulating part is coated with adhesive material, and / or the side of the insulating part facing the shell is coated with adhesive material. In this way, the damping between the insulating part and the shell can be increased, thereby buffering the falling impact force of the electrode assembly when entering the shell, reducing the load on the insulating part, and further effectively reducing the possibility of tearing and damage to the insulating part.

[0019] In some possible embodiments, the first roughness is greater than the second roughness, the shell includes a side wall, the first roughness is the roughness of the surface of the side wall facing the insulating member, and the second roughness is the roughness of the surface of the side wall away from the insulating member; and / or the third roughness is greater than the fourth roughness, the third roughness is the roughness of the side of the insulating member facing the shell, and the fourth roughness is the roughness of the side of the insulating member away from the shell.

[0020] The above technical solution can increase the damping between the insulating part and the shell by increasing the roughness on the surface of the shell facing the insulating part and / or the side of the insulating part facing the shell, thereby buffering the falling impact force of the electrode assembly when entering the shell, reducing the load on the insulating part, and effectively reducing the possibility of tearing and damage to the insulating part.

[0021] In a second aspect, a battery device is provided, comprising: a battery cell in the above-mentioned first aspect or its various implementations.

[0022] In a third aspect, an electrical device is provided, comprising the battery device in the second aspect, wherein the battery device is used to provide electrical energy to the electrical device.

[0023] In a fourth aspect, an energy storage device is provided, comprising the battery device in the second aspect, wherein the battery device is used to store electrical energy for the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a vehicle according to an embodiment of the present application is shown.

[0025] Figure 2 A schematic structural diagram of a battery according to an embodiment of the present application is shown.

[0026] Figure 3 A schematic diagram of a battery cell according to an embodiment of the present application is shown.

[0027] Figure 4 A schematic exploded view of another battery cell according to an embodiment of the present application is shown.

[0028] Figure 5 A schematic diagram of an insulating member after unfolding according to an embodiment of the present application is shown.

[0029] Figure 6 A schematic diagram of another insulating member after unfolding according to an embodiment of the present application is shown.

[0030] Figure 7 A schematic diagram of another insulating member after unfolding according to an embodiment of the present application is shown.

[0031] Figure 8 A schematic diagram showing another insulating member after unfolding according to an embodiment of the present application is shown.

[0032] Fig. 9 A schematic diagram showing another insulating member after unfolding according to an embodiment of the present application is shown.

[0033] Fig.10 A schematic diagram of yet another battery cell according to an embodiment of the present application is shown.

[0034] Fig.11 A schematic diagram showing yet another battery cell according to an embodiment of the present application is shown.

[0035] Explanation of the figure numbers: 1-vehicle; 10-battery; 30-controller; 40-motor; 20-battery cell; 111-first box body; 112-second box body; 22-shell; 21-electrode assembly; 24-insulating member; 241-reinforcement member; 23-end cover assembly; 214-electrode terminal; 214a-positive electrode terminal; 214b-negative electrode terminal; 221a-first pole ear; 222a-second pole ear; 25-connecting member; 213-pressure relief mechanism; 242-bottom; 2421-through hole; 243-first area; 223-side wall; 26-adhesive material. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0038] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0039] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0040] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0041] In the field of new energy, batteries can be used as the main power source for electrical devices (such as vehicles, ships or spacecraft). The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack.

[0042] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0043] The battery cell 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.

[0044] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0045] 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.

[0046] 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.

[0047] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon or titanium, 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.).

[0048] 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 LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0049] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0050] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon or titanium, 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.).

[0051] 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.

[0052] 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.

[0053] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells 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.

[0054] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, or foam alloy, etc. When the foam metal is used as the negative electrode plate, 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.

[0055] As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the negative electrode current collector, and the lithium source material is lithium metal and / or lithium-rich material.

[0056] 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.

[0057] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0058] 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.

[0059] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0060] 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.

[0061] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0062] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0063] In some embodiments, the electrode assembly is a laminate structure.

[0064] 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.

[0065] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0066] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0067] 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.

[0068] 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.

[0069] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0070] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0071] The battery cell also includes a shell, which has an opening, and the electrode assembly is accommodated in the shell. At present, the outer surface of the electrode assembly is usually coated with an insulating film to prevent a short circuit between the motor assembly and the shell. There is a gap between the electrode assembly and the shell, and they can move relative to each other. The electrode assembly is only connected to the end cover assembly of the battery cell through the pole ear at the top. In order to avoid pulling the pole ear during movement, the insulating film also plays a role in bearing the weight of the electrode assembly. In a static state, the insulating film generally does not have problems such as tearing and damage of the structural body and failure of the connection interface. However, this problem cannot be ignored during the process of the battery cell being generated and put into the shell and when the electrical device vibrates.

[0072] In view of this, the embodiment of the present application proposes a battery cell, which includes a shell, an electrode assembly and an insulating member, wherein the electrode assembly is accommodated in the shell, the insulating member is arranged between the shell and the electrode assembly, and is used to cover the electrode assembly, and a reinforcing member is arranged on the insulating member. By arranging the reinforcing member on the insulating member, the bearing capacity of the insulating member can be enhanced, so that during the processing or use of the battery cell, when the impact force of the electrode assembly acts on the insulating member, the reinforced insulating member can bear the impact force, so that the probability of the insulating member being torn or damaged is significantly reduced.

[0073] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries.

[0074] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0075] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0076] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 may be arranged at the lower part, the front or the rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0077] For example, Figure 2, which is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application. The battery 10 may include a plurality of battery cells 20. In addition to the battery cells 20, the battery 10 may also include a box body, the interior of the box body is a hollow structure, and the plurality of battery cells 20 may be accommodated in the box body. Figure 2 As shown, the box body may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are buckled together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the combination of multiple battery cells 20, and at least one of the first box body part 111 and the second box body part 112 has an opening. For example, Figure 2 As shown, only one of the first box body 111 and the second box body 112 is a hollow cuboid with an opening, and the other is in a plate shape to cover the opening. Here, taking the second box body 112 as a hollow cuboid with only one face as an opening face, and the first box body 111 as a plate-shaped example, the first box body 111 covers the opening of the second box body 112 to form a box body 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. After the multiple battery cells 20 are connected in parallel, in series or in mixed series, they are placed in the box body formed by the first box body 111 and the second box body 112 being buckled together.

[0078] For example, unlike Figure 2 As shown, the first box body 111 and the second box body 112 can both be hollow cuboids and each have only one open face, the opening of the first box body 111 and the opening of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box with a closed chamber. A plurality of battery cells 20 are connected in parallel, in series or in a mixed combination and are placed in the box formed by the first box body 111 and the second box body 112 buckled together.

[0079] In some embodiments, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component (not shown in the figure), which is used to realize the electrical connection between multiple battery cells 20. Specifically, the busbar component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. In some embodiments, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box through the conductive mechanism. In some embodiments, the conductive mechanism may also belong to the busbar component.

[0080] In order to meet different power requirements, the number of battery cells 20 can be multiple, and multiple battery cells can be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection. Battery 10 can also be called a battery pack. In some embodiments, multiple battery cells can be connected in series, in parallel, or in hybrid connection to form a battery module, and multiple battery modules can be connected in series, in parallel, or in hybrid connection to form battery 10. In other words, multiple battery cells can directly form battery 10, or they can first form battery modules, and then battery modules can form battery 10.

[0081] Figure 3 FIG. 2 shows a schematic diagram of a battery cell 20 according to an embodiment of the present application. Figure 3 As shown, the battery cell 20 includes a housing 22, an electrode assembly 21 and an insulating member 24. The electrode assembly 21 is accommodated in the housing 22, and the insulating member 24 is disposed between the housing 22 and the electrode assembly 21 to cover the electrode assembly 21. A reinforcing member 241 is disposed on the insulating member 24.

[0082] In the embodiment of the present application, a reinforcing member 241 is provided on the insulating member 24 to enhance the bearing capacity of the insulating member 24. Thus, during the processing or use of the battery cell 20, when the impact force of the electrode assembly 21 acts on the insulating member 24, the reinforced insulating member 24 can bear the impact force, so that the probability of the insulating member 24 being torn or damaged is significantly reduced.

[0083] Figure 4 exist Figure 3 A more specific schematic exploded view of the battery cell 20 of the embodiment of the present application is shown based on FIG. Figure 4 As shown, in addition to the housing 22, the electrode assembly 21 and the insulating member 24, the battery cell 20 further includes an end cap assembly 23. The wall of the housing 22 and the end cap assembly 23 are both referred to as the wall of the battery cell 20.

[0084] The shell 22 is determined according to the shape of one or more electrode assemblies 21 after being combined. For example, the shell 22 can be a hollow cuboid or a cube or a cylinder, and one of the faces of the shell 22 has an opening so that one or more electrode assemblies 21 can be placed in the shell 22. For example, when the shell 22 is a hollow cuboid or a cube, one of the planes of the shell 22 is an open surface, that is, the plane does not have a wall body so that the inside and outside of the shell 22 are connected. When the shell 22 can be a hollow cylinder, the end face of the shell 22 is an open face, that is, the end face does not have a wall body so that the inside and outside of the shell 22 are connected. The end cap assembly 23 covers the opening and is connected to the shell 22 to form a closed cavity for placing the electrode assembly 21. The shell 22 is filled with an electrolyte, such as an electrolyte.

[0085] The battery cell 20 also includes two electrode terminals 214. The end cap assembly 23 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the end cap assembly 23, and the two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connection member 25, or it can also be called a current collecting member, which is located between the end cap assembly 23 and the electrode assembly 21, and is used to electrically connect the electrode assembly 21 and the electrode terminal 214.

[0086] like Figure 4 As shown, each electrode assembly 21 has a first pole tab 221a and a second pole tab 222a. The polarities of the first pole tab 221a and the second pole tab 222a are opposite. For example, when the first pole tab 221a is a positive pole tab, the second pole tab 222a is a negative pole tab. The first pole tab 221a of one or more electrode assemblies 21 is connected to an electrode terminal 214 through a connecting member 25, and the second pole tab 222a of one or more electrode assemblies 21 is connected to another electrode terminal 214 through another connecting member 25. For example, the first pole tab 221a is a positive pole tab, the second pole tab 222a is a negative pole tab, the positive electrode terminal 214a is connected to the first pole tab 221a through a connecting member 25, and the negative electrode terminal 214b is connected to the second pole tab 222a through another connecting member 25.

[0087] In the battery cell 20, the electrode assembly 21 can be provided as a single electrode assembly or multiple electrode assemblies according to actual use requirements. Figure 3 and Figure 4 As shown, two independent electrode assemblies 21 are disposed in the battery cell 20 .

[0088] As an example, a pressure relief mechanism 213 may be further provided on a wall of the battery cell 20. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value. Optionally, the pressure relief mechanism 213 may be provided on the end cap assembly 23 or on any wall of the housing 22.

[0089] The insulating member 24 is connected to the end cap assembly 23 through the upper edge, and there is no connection point at other positions. Among them, "upper" in the embodiment of the present application means the direction opposite to the direction of gravity, and "lower" in the embodiment of the present application means the direction same as the direction of gravity.

[0090] The insulating member 24 may be an insulating film, which may be made of, but not limited to, a polypropylene film, a PET film, or the like.

[0091] Figure 5-Figure 9 is a schematic diagram of the insulating member 24 after it is unfolded, Figure 6-Figure 9The left figure in the figure is a schematic diagram of the insulating member 24 without the reinforcing member 241, and the right figure is a schematic diagram of the reinforcing member 241. Figure 5-Figure 9 As shown, the bottom 242 of the insulating member 24 is provided with at least one through hole 2421, and the at least one through hole 2421 is used for the circulation of electrolyte. In this way, the normal circulation of electrolyte can be ensured, thereby ensuring the normal operation of the battery cell. Among them, the bottom 242 of the insulating member 24 is used to cover the bottom wall of the electrode assembly 21, and the bottom wall is a wall of the electrode assembly 21 perpendicular to the height direction and is located below the electrode assembly 21.

[0092] It should be noted that, in the embodiment of the present application, the height direction is the z direction, the length direction is the x direction, and the width direction is the y direction.

[0093] Optionally, the reinforcing member 241 may be a reinforcing rib or a thickened area on the insulating member 24. In the case where the reinforcing member 241 is a reinforcing rib, the reinforcing rib may be fixed to the insulating member 24 by hot melting, bonding, or the like or may be designed as an integral whole.

[0094] The reinforcement member 241 may be disposed at a side of the insulating member 24 away from the electrode assembly 21 .

[0095] Alternatively, considering that the gap between the insulating member 24 and the electrode assembly 21 is generally larger than the gap between the insulating member 24 and the shell 22 , the reinforcing member 241 may be disposed on a side of the insulating member 24 facing the electrode assembly 21 .

[0096] Since the gap between the insulating member 24 and the electrode assembly 21 is usually larger than the gap between the insulating member 24 and the shell 22, the technical solution, in which the reinforcement member 241 is arranged on the side of the insulating member 24 facing the electrode assembly 21, can reduce the internal space of the battery cell 20 occupied by the reinforcement member 241, thereby improving the space utilization of the battery cell 20.

[0097] The reinforcing member 241 may be disposed on a side surface 244 of the insulating member 24 , for example, on a large surface of the insulating member 24 .

[0098] Or, if Figure 5 and Figure 6 As shown, the reinforcement member 241 may be disposed in a first region 243 of the insulating member 24 , and the first region 243 is a region corresponding to a corner region of the electrode assembly 21 .

[0099] In other words, the reinforcement member 241 may be disposed on a side of the insulating member 24 .

[0100] Since the gap between the insulating member 24 and the corner area of ​​the electrode assembly 21 is usually larger than the gap between the insulating member 24 and other areas, setting the reinforcement member 241 in the area of ​​the insulating member 24 corresponding to the corner area of ​​the electrode assembly 21 can minimize the internal space of the battery cell 20 occupied by the reinforcement member 241, thereby effectively improving the energy density of the battery cell 20.

[0101] The electrode assembly 21 includes four corner regions, and the first region 243 may be a region corresponding to any corner region. For example, the first region 243 may be a region corresponding to one of the corner regions. For another example, in order to enhance the reinforcing effect of the reinforcing member 241 on the insulating member 24, again refer to Figure 5 and Figure 6 The first region 243 may be a region corresponding to four corner regions, that is, the reinforcement member 241 is disposed in a region of the insulating member 24 corresponding to all corner regions of the electrode assembly 21 .

[0102] In the case where the first region 243 is a region corresponding to a plurality of corner regions, the sizes of the reinforcement members 241 corresponding to different corner regions may be the same or different.

[0103] The embodiment of the present application does not specifically limit the size of the reinforcement member 241 in the first area 243. For example, the size of the reinforcement member 241 in the height direction may be smaller than the size of the insulating member 24 in the height direction, or, Figure 5 and Figure 6 As shown, the height dimension of the reinforcing member 241 may be the same as the height dimension of the insulating member 24, so as to maximize the strength of the insulating member 24. Alternatively, the thickness of the reinforcing member 241 may be greater than the thickness of the insulating member 24, or may be equal to the thickness of the insulating member 24.

[0104] If the size of the reinforcement member 241 is too small, the reinforcement member 241 may not play the role of reinforcing the insulating member 24. If the size of the reinforcement member 241 is too large, the insulating member 24 may be subjected to extremely unbalanced force. Therefore, in some embodiments, the first cross-sectional area may be 1 / 5-2 / 3 of the second cross-sectional area. The first cross-sectional area is the cross-sectional area of ​​the reinforcement member 241 in the direction parallel to the opening of the shell, and the second cross-sectional area is the cross-sectional area of ​​the insulating member 24 in the direction parallel to the opening of the shell.

[0105] The opening direction of the shell is parallel to the bottom wall of the electrode assembly.

[0106] Furthermore, the first cross-sectional area may be 1 / 4-1 / 2 of the second cross-sectional area. For example, the first cross-sectional area may be 1 / 3, 2 / 5, etc. of the second cross-sectional area. Setting the first cross-sectional area to 1 / 4-1 / 2 of the second cross-sectional area can balance the reinforcement and force balance of the insulating member 24, thereby effectively improving the performance of the insulating member 24 and the battery cell 20.

[0107] It should be noted that when the first region 243 is an area corresponding to multiple corner areas, the first cross-sectional area is the cross-sectional area of ​​all reinforcement members 241 arranged in the first region 243 in a direction parallel to the opening of the shell, and the second cross-sectional area is the cross-sectional area of ​​the entire insulating member in a direction parallel to the opening of the shell.

[0108] In order to reduce the possibility of failure of the bottom 242 of the insulating member 24 , in some embodiments, a reinforcing member 241 may be disposed at the bottom 242 of the insulating member 24 .

[0109] In this way, the bearing capacity of the bottom 242 can be effectively enhanced. In this way, during the processing or use of the battery cell 20, when the impact force of the electrode assembly 21 acts on the bottom 242 of the insulating part 24, the insulating part 24 with the reinforced bottom 242 can withstand the impact force, so that the probability of the insulating part 24 being torn or damaged can be significantly reduced.

[0110] The thickness of the reinforcing member 241 on the bottom 242 can be specifically set according to actual conditions, for example, according to the size of the electrode assembly 21, the application scenario of the battery cell 20, etc.

[0111] The reinforcement member 241 may be disposed at any area of ​​the bottom 242. For example, the reinforcement member 241 may be disposed at the middle area of ​​the bottom 242, or the reinforcement member 241 may be disposed at the edge area of ​​the bottom 242. In the case where the reinforcement member 241 is disposed at the edge area of ​​the bottom 242, the reinforcement member 241 may be disposed at two opposite ends of the bottom 242 disposed in the width direction. Figure 7 As shown, the reinforcing member 241 can be arranged at two opposite ends of the bottom 242 along the length direction. That is, the reinforcing member 241 can be arranged on two short sides of the bottom 242. Of course, the reinforcing member 241 can also be arranged on one short side or one long side of the bottom 242, or on one short side and one long side of the bottom 242.

[0112] In order to further increase the load-bearing capacity of the insulating member 24, as Figure 8 As shown, the first thickness is greater than the second thickness, the first thickness is the thickness of at least a region of the bottom 242, and the second thickness is the thickness of other regions of the insulating member except the at least partial region.

[0113] The above technical solution sets the thickness of at least a part of the bottom 242 to be greater than the thickness of other areas of the insulating member, which is equivalent to strengthening the bottom 242 of the insulating member, thereby further enhancing the bearing capacity of the insulating member.

[0114] Exemplarily, the first thickness may be a thickness of the entire region of the bottom portion 242 . In other words, the reinforcement member 241 may be disposed on the entire bottom portion 242 of the insulating member 24 .

[0115] In order to ensure the normal circulation of the electrolyte, at this time, the reinforcement 241 is also provided with at least one through hole 2421 for the circulation of the electrolyte. The through holes 2421 on the reinforcement 241 may correspond one-to-one to the through holes on the bottom wall of the electrode assembly 21, or may not correspond to the through holes on the bottom wall of the electrode assembly 21, and this embodiment of the present application does not specifically limit this. Providing at least one through hole 2421 for the circulation of the electrolyte on the reinforcement 241 can ensure the normal circulation of the electrolyte, thereby ensuring the normal operation of the battery cell 20.

[0116] It should be noted that when the first region 243 of the insulating member 24 is provided with the reinforcing member 241, the first thickness may be greater than the second thickness. Fig. 9 As shown, the side edges and the entire bottom 242 of the insulating member 24 are provided with reinforcing members 241 .

[0117] It should also be noted that when the bottom 242 of the insulating member 24 is thick enough, the battery cell 20 may not include a bottom support plate.

[0118] In some embodiments, the damping between the insulating member 24 and the housing 22 may be greater than the damping between the insulating member 24 and the electrode assembly 21 .

[0119] This technical solution can buffer the falling impact force of the electrode assembly 21 when entering the shell by increasing the damping between the insulating member 24 and the shell 22, so as to reduce the load on the insulating member, thereby reducing the possibility of tearing and damage of the insulating member 24.

[0120] As an example, Fig.10 As shown, the housing 22 includes a side wall 223, and the surface of the side wall 223 facing the insulating member 24 may be coated with an adhesive material 26, and / or, as shown in FIG. Fig.11 As shown, the side of the insulating member 24 facing the housing 22 may be coated with an adhesive material 26 .

[0121] In this technical solution, the surface of the side wall 223 facing the insulating part 24 is coated with the adhesive material 26, and / or the side surface of the insulating part 24 facing the shell 22 is coated with the adhesive material 26. In this way, the damping between the insulating part 24 and the shell 22 can be increased, thereby buffering the falling impact force of the electrode assembly 21 when entering the shell, reducing the load on the insulating part 24, and further effectively reducing the possibility of tearing and damage of the insulating part 24.

[0122] It should be noted that Fig.10 and Fig.11 The shaded portion in the figure is the bonding material 26 .

[0123] The adhesive material 26 may be a non-curing material, and allows separation under external force without damaging the insulating member 24, and may be sticky for a long time (e.g., more than 10 days). In addition, the adhesive material 26 will not react with or dissolve the electrolyte. Exemplarily, the adhesive material 26 may include, but is not limited to, organic silicone adhesive, epoxy resin adhesive, a mixed adhesive material of an adhesive and a non-adhesive material, etc. The non-adhesive material may include, for example, polycarbonate (PCS).

[0124] Part of the surface of the side wall 223 facing the insulating member 24 may be coated with the adhesive material 26, or all of the surfaces may be coated with the adhesive material 26. For example, the side wall 223 has four surfaces facing the insulating member 24, one of the four surfaces may be coated with the adhesive material 26, or two of the four surfaces may be coated with the adhesive material 26, or all of the four surfaces may be coated with the adhesive material 26.

[0125] Correspondingly, part of the side surface of the insulating member 24 facing the housing 22 may be coated with the adhesive material 26 , or all the side surfaces may be coated with the adhesive material 26 .

[0126] As another example, the surface of the side wall 223 facing the insulating member 24 and / or the side surface of the insulating member 24 facing the housing 22 may be roughened.

[0127] In other words, the first roughness may be greater than the second roughness, the shell 22 includes a side wall 223, the first roughness is the roughness of the surface of the side wall 223 facing the insulating part 24, and the second roughness is the roughness of the surface of the side wall 223 away from the insulating part 24; and / or the third roughness may be greater than the fourth roughness, the third roughness is the roughness of the side of the insulating part 24 facing the shell 22, and the fourth roughness is the roughness of the side of the insulating part 24 away from the shell 22.

[0128] This technical solution can increase the damping between the insulating part 24 and the shell 22 by increasing the roughness on the surface of the shell 22 facing the insulating part 24 and / or the side of the insulating part facing the shell 22, thereby buffering the falling impact force of the electrode assembly 21 when entering the shell, reducing the load on the insulating part 24, and effectively reducing the possibility of tearing and damage of the insulating part 24.

[0129] The surface of the side wall 223 facing the insulating member 24 may be polished or micro-etched to increase the roughness. Similarly, the side surface of the insulating member 24 facing the housing 22 may be polished or micro-etched to increase the roughness.

[0130] The present application also provides a battery device, which may include the battery cell 20 in the above embodiments. In some embodiments, the battery device may also include other structures such as a box body and a current collector, which will not be described in detail here.

[0131] An embodiment of the present application further provides an electrical device, which may include the battery in the aforementioned embodiment, and the battery is used to provide electrical energy to the electrical device.

[0132] In some embodiments, the electrical device may be Figure 1 Vehicle 1, ship or spacecraft.

[0133] An embodiment of the present application further provides an energy storage device, which may include the battery device in the aforementioned embodiment, and the battery device is used to store electrical energy in the energy storage device.

[0134] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: case; an electrode assembly, contained in the housing; An insulating member is arranged between the shell and the electrode assembly and is used to cover the electrode assembly, wherein a reinforcing member is arranged on the side of the insulating member facing the electrode assembly, and the reinforcing member is arranged in a first area of ​​the insulating member, and the first area is an area corresponding to a corner area of ​​the electrode assembly.

2. The battery cell according to claim 1, characterized in that: The first cross-sectional area is 1 / 4-1 / 2 of the second cross-sectional area, wherein the first cross-sectional area is the cross-sectional area of ​​the reinforcement in a direction parallel to the opening of the shell, and the second cross-sectional area is the cross-sectional area of ​​the insulating member in a direction parallel to the opening.

3. The battery cell according to claim 1 or 2, characterized in that: The reinforcing member is also arranged at the bottom of the insulating member.

4. The battery cell according to claim 3, characterized in that: The reinforcing member is arranged at two opposite ends of the bottom of the insulating member along the length direction.

5. The battery cell according to claim 3, characterized in that: The first thickness is greater than the second thickness, the first thickness is the thickness of at least a portion of the bottom, and the second thickness is the thickness of other regions of the insulating member except the at least a portion of the bottom.

6. The battery cell according to claim 1 or 2, characterized in that: The bottom of the insulating member is provided with at least one through hole for the circulation of electrolyte.

7. The battery cell according to claim 1 or 2, characterized in that: The damping between the insulating member and the housing is greater than the damping between the insulating member and the electrode assembly.

8. The battery cell according to claim 7, characterized in that: The housing comprises a side wall, and a surface of the side wall facing the insulating member is coated with an adhesive material; and / or The side surface of the insulating member facing the housing is coated with an adhesive material.

9. The battery cell according to claim 7, characterized in that: The first roughness is greater than the second roughness, the housing comprises a side wall, the first roughness is the roughness of a surface of the side wall facing the insulating member, and the second roughness is the roughness of a surface of the side wall away from the insulating member; and / or The third roughness is greater than the fourth roughness, the third roughness is the roughness of the side of the insulating member facing the shell, and the fourth roughness is the roughness of the side of the insulating member away from the shell.

10. A battery device, characterized in that: include: A battery cell as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: include: The battery device as claimed in claim 10, wherein the battery device is used to provide electrical energy to the electrical device.

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