Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, battery device and power utilization device, battery monomer includes flexible shell, electrode subassembly and support structure, electrode subassembly is provided in flexible shell, support structure is provided in flexible shell and is located between electrode subassembly and flexible shell, support structure hardness is greater than flexible shell hardness, and the flexible shell is provided with flexible shell. And the hardness of the supporting structure is HB30-HB80. According to the battery monomer disclosed by the utility model, the phenomenon of low capacity or lithium precipitation in the circulation process caused by extrusion of the internal electrode assembly due to deformation of the flexible shell can be reduced, so that the battery monomer has relatively good circulation performance.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric device. Background Art

[0002] In the related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment, aerospace and other fields. Batteries can be roughly divided into soft-pack batteries and hard-shell batteries according to the hardness of the shell. Soft-pack batteries have the advantages of high mass / volume energy density and good safety, making the application of soft-pack batteries more and more extensive.

[0003] Due to the characteristics of the shell of the soft-pack battery, when multiple soft-pack battery cells are assembled into a group, the soft-pack battery is subjected to external forces, such as the assembly force applied during assembly, the squeezing force of other structures in the box on the soft-pack battery, and the squeezing force of local particles on the soft-pack battery. The shell of the soft-pack battery is easily squeezed and deformed, thereby squeezing the pole piece located in the shell, reducing the cycle performance of the battery, such as causing low capacity or lithium precipitation during the cycle. Therefore, how to reduce the problem of the shell deformation of the soft-pack battery and squeezing the pole piece to cause the battery performance to deteriorate is a technical problem to be solved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, wherein the battery cell can reduce the occurrence of low capacity or lithium deposition during the cycle due to the deformation of the flexible shell squeezing the internal electrode assembly, so that the battery cell has better cycle performance.

[0005] In a first aspect, the utility model provides a battery cell, comprising: a flexible shell; an electrode assembly, wherein the electrode assembly is disposed in the flexible shell; a support structure, wherein the support structure is disposed in the flexible shell and is located between the electrode assembly and the flexible shell, wherein the hardness of the support structure is greater than the hardness of the flexible shell, and the hardness of the support structure is HB30 to HB80.

[0006] In the above technical solution, by arranging a support structure in the flexible shell and making the support structure between the electrode assembly and the flexible shell, and making the hardness of the support structure greater than the hardness of the flexible shell, the support structure can play a role in supporting the flexible shell, and when the battery cell is subjected to external force, the deformation of the flexible shell can be reduced, thereby reducing the occurrence of low capacity or lithium precipitation during the cycle caused by squeezing the internal electrode assembly due to the deformation of the flexible shell, so that the battery cell has better cycle performance. In addition, by setting the hardness of the support structure at HB30 to HB80, the support structure can effectively support the flexible shell while making the hardness of the support structure moderate, and still has the advantages of higher mass / volume energy density and better safety compared to hard shell batteries.

[0007] In some embodiments, the support structure includes a metal substrate and an insulating layer, wherein the insulating layer covers a side of the metal substrate facing the electrode assembly.

[0008] In the above technical solution, by making the support structure include a metal substrate and an insulating layer arranged on the side facing the electrode assembly, the support structure can have a higher hardness relative to the flexible shell to achieve effective support for the flexible shell, and the insulating layer can insulate the metal substrate of the support structure from the electrode assembly, thereby improving the safety of the battery cell.

[0009] In some embodiments, the metal substrate is an aluminum alloy substrate, a steel substrate, or a copper substrate.

[0010] In the above technical solution, by setting the metal matrix of the support structure to an aluminum alloy matrix, a steel matrix or a copper matrix, the support structure can have higher hardness and strength relative to the flexible shell, thereby providing effective support for the flexible shell and reducing the extrusion of the internal electrode assembly due to deformation of the flexible shell.

[0011] In some embodiments, the support structure is a piece of polymer material.

[0012] In the above technical solution, by setting the support structure as a polymer material, the support structure has greater hardness and strength relative to the flexible shell, and at the same time, the density of the support structure can be reduced, which is beneficial to improving the mass energy density of the battery cell.

[0013] In some embodiments, the support structure is a piece of polypropylene foam material.

[0014] In the above technical solution, by setting the support structure as a polypropylene foam material piece, the support structure can have greater hardness and strength relative to the flexible shell, and at the same time, the density of the support structure can be smaller, which is beneficial to improving the mass energy density of the battery cell.

[0015] In some embodiments, the support structure includes a plurality of support plates, and the plurality of support plates are distributed on different sides of the electrode assembly.

[0016] In the above technical solution, by setting the support structure to include multiple support plates and the multiple support plates are distributed on different sides of the electrode assembly, the multiple support plates can support the flexible shell at different positions. When different sides of the battery cell are subjected to external forces, the extrusion of the internal electrode assembly caused by the deformation of the flexible shell can be better reduced.

[0017] In some embodiments, the support plate has a thickness of 0.1 mm to 0.7 mm.

[0018] In the above technical solution, by making the thickness of the support plate not less than 0.1 mm, the support plate can have higher rigidity and strength relative to the flexible shell, making the support plate less likely to deform, thereby providing better support for the flexible shell, and by making the thickness of the support plate not more than 0.7 mm, the space occupied by the support plate in the flexible shell can be reduced, thereby increasing the energy density of the battery cell.

[0019] In some embodiments, the support plate includes a metal substrate and an insulating layer, the insulating layer covers a side of the metal substrate facing the electrode assembly, the metal substrate is an aluminum alloy substrate, and the thickness of the support plate is 0.5 mm to 0.7 mm.

[0020] In the above technical solution, by making the support plate include a metal substrate and an insulating layer arranged on the side facing the electrode assembly, the support plate can have a higher hardness relative to the flexible shell to achieve effective support for the flexible shell, and the insulating layer can insulate the metal substrate of the support plate from the electrode assembly to improve the safety of the battery cell. Moreover, on this basis, setting the metal substrate as an aluminum alloy substrate can make the support plate have a higher hardness and strength while also making the density of the support plate smaller, which is conducive to making the energy density of the battery cell larger; further, when the metal substrate of the support plate is set as an aluminum alloy substrate, the thickness of the metal substrate is set at 0.5mm to 0.7mm, so that the support plate can have a higher rigidity and strength relative to the flexible shell, making the support plate less likely to deform, thereby playing a better supporting role for the flexible shell, and can reduce the space occupied by the support plate in the flexible shell, so that the energy density of the battery cell is larger.

[0021] In some embodiments, the support plate includes a metal substrate and an insulating layer, the insulating layer covers a side of the metal substrate facing the electrode assembly, the metal substrate is a steel substrate, and the thickness of the support plate is 0.2 mm to 0.4 mm.

[0022] In the above technical solution, by making the support plate include a metal substrate and an insulating layer arranged on the side facing the electrode assembly, the support plate can have a higher hardness relative to the flexible shell to achieve effective support for the flexible shell, and the insulating layer can insulate the metal substrate of the support plate from the electrode assembly, thereby improving the safety of the battery cell. Moreover, on this basis, the metal substrate is set as a steel substrate and the thickness of the metal substrate is set at 0.2mm to 0.4mm, so that the support plate can have a higher rigidity and strength relative to the flexible shell, making the support plate less likely to deform, thereby playing a better supporting role for the flexible shell, and can reduce the space occupied by the support plate in the flexible shell, so that the energy density of the battery cell is higher.

[0023] In some embodiments, the support plate includes a metal substrate and an insulating layer, the insulating layer covers a side of the metal substrate facing the electrode assembly, the metal substrate is a copper substrate, and the thickness of the support plate is 0.4 mm to 0.6 mm.

[0024] In the above technical solution, by making the support plate include a metal substrate and an insulating layer arranged on the side facing the electrode assembly, the support plate can have a higher hardness relative to the flexible shell to achieve effective support for the flexible shell, and the insulating layer can insulate the metal substrate of the support plate from the electrode assembly, thereby improving the safety of the battery cell. Moreover, on this basis, the metal substrate is set as a copper substrate and the thickness of the metal substrate is set at 0.4mm to 0.6mm, so that the support plate can have a higher rigidity and strength relative to the flexible shell, making the support plate less likely to deform, thereby playing a better supporting role for the flexible shell, and can reduce the space occupied by the support plate in the flexible shell, so that the energy density of the battery cell is higher.

[0025] In some embodiments, the thickness of the support plate is greater than or equal to the thickness of the flexible shell.

[0026] In the above technical solution, by making the thickness of the support plate not less than the thickness of the flexible shell, the hardness of the support plate can be made greater than that of the flexible shell, and the support plate can have higher rigidity and strength, so that the support plate is less likely to deform and can provide better support for the flexible shell.

[0027] In some embodiments, the plurality of support plates include two first support plates, and the two first support plates are located at opposite sides of the electrode assembly in a thickness direction.

[0028] In the above technical solution, by arranging two of the multiple support plates on opposite sides in the thickness direction of the electrode assembly, the large surface of the flexible shell can be effectively supported, which can effectively reduce the deformation of the large surface of the flexible shell and the squeezing of the internal electrode assembly.

[0029] In some embodiments, in the width direction of the electrode assembly, the ratio of the width of the first support plate to the width of the electrode assembly is greater than or equal to 1 / 3; and / or, in the length direction of the electrode assembly, the ratio of the length of the first support plate to the length of the electrode assembly is greater than or equal to 1 / 3.

[0030] In the above technical solution, by setting the ratio of the size of the first support plate in the width direction and / or the length direction to the size of the electrode assembly to be greater than or equal to 1 / 3, the first support plate can have a larger supporting area for the large surface of the flexible shell, thereby achieving a better supporting effect.

[0031] In some embodiments, the plurality of support plates include a second support plate connected between two of the first support plates, the second support plate being located on at least one side in the width direction of the electrode assembly, and the electrode tab of the electrode assembly being located on at least one side of the electrode assembly along the length direction of the electrode assembly.

[0032] In the above technical solution, by arranging the second support plate among the multiple support plates on at least one side in the width direction of the electrode assembly, the second support plate can support the side surface of the flexible shell in the width direction, thereby reducing the deformation of the side surface of the flexible shell in the width direction and squeezing the internal electrode assembly; and, by connecting the second support plate to the first support plates on both sides, the overall strength and stability of the support structure can be improved, thereby better supporting the flexible shell.

[0033] In some embodiments, the plurality of support plates include a third support plate connected to at least one of the first support plate and the second support plate, and the third support plate is located at at least one side in the length direction of the electrode assembly.

[0034] In the above technical solution, by setting the multiple support plates to include a third support plate, so that the third support plate is located on at least one side in the length direction of the electrode assembly, the third support plate can support the side surface of the flexible shell in the length direction, thereby reducing the deformation of the side surface of the flexible shell in the length direction and squeezing the internal electrode assembly; and, by connecting the third support plate to at least one of the first support plate and the second support plate, the overall strength and stability of the support structure can be improved, thereby better supporting the flexible shell.

[0035] In some embodiments, a clearance opening for avoiding the tab is formed on the third support plate.

[0036] In the above technical solution, by providing an escape opening for avoiding the tab on the third support plate, the escape opening can facilitate the leading out of the tab while making the third support plate have a larger supporting area as possible.

[0037] In some embodiments, exhaust holes are formed on at least a portion of the support plate.

[0038] In the above technical solution, by setting exhaust holes on at least part of the support plate, when the battery cell is working, the high-temperature substances generated in the electrode assembly can be arranged to the outside of the support structure through the exhaust holes, thereby reducing the accumulation of high-temperature substances inside the electrode assembly and improving the safety of the battery cell.

[0039] In some embodiments, the multiple support plates include a first support plate and a second support plate, there are two first support plates, the two first support plates are located on opposite sides of the thickness direction of the electrode assembly, the second support plate is connected between the two first support plates, the second support plate is located on at least one side in the width direction of the electrode assembly, and the exhaust holes are formed on the second support plates.

[0040] In the above technical solution, by setting the plurality of support plates to include a first support plate located on both sides of the electrode assembly in the thickness direction and a second support plate located on at least one side of the electrode assembly in the width direction, the first support plate can effectively support the large surface of the flexible shell, which can effectively reduce the deformation of the large surface of the flexible shell and the squeezing of the internal electrode assembly, and the second support plate can support the side surface in the width direction of the flexible shell, which can reduce the deformation of the side surface in the width direction of the flexible shell and the squeezing of the internal electrode assembly; and, by setting the exhaust hole on the second support plate, the high-temperature substance generated in the electrode assembly can be arranged to the outside of the support structure through the exhaust hole, reducing the accumulation of high-temperature substances in the electrode assembly and improving the safety of the battery cell; in addition, compared with setting the exhaust hole on the first support plate, setting the exhaust hole on the second support plate can realize the discharge of the high-temperature substances generated in the electrode assembly while maintaining a high structural strength and rigidity of the first support plate, so that the first support plate can provide a better support for the large surface of the flexible shell, and better reduce the deformation of the large surface of the flexible shell and the squeezing of the internal electrode assembly.

[0041] In some embodiments, the flexible shell is an aluminum-plastic film; or, the hardness of the flexible shell is HB16-HB22.

[0042] In the above technical solution, by setting the flexible shell to an aluminum-plastic film or setting the hardness of the flexible shell to HB16-HB22, the hardness of the flexible shell can be lowered. In the event of thermal runaway, due to the lower hardness of the flexible shell, the flexible shell is more likely to crack under the action of internal pressure, which can reduce the risk of explosion of the battery cell; and, due to the lower hardness of the flexible shell, the flexible shell can be more tightly covered on the outside of the electrode assembly and the supporting structure, reducing the gap between the flexible shell and the electrode assembly, which is beneficial to improving the energy density of the battery cell.

[0043] In some embodiments, the support structure is fixed to an inner wall of the flexible housing or an outer wall of the electrode assembly.

[0044] In the above technical solution, by fixing the support structure on the inner wall of the flexible shell or the outer wall of the electrode assembly, the support structure can be more stably installed in the flexible shell, thereby providing better support for the flexible shell.

[0045] In some embodiments, the support structure is connected to the flexible housing or the electrode assembly via a structural adhesive layer.

[0046] In the above technical solution, the support structure is connected to the flexible housing or the electrode assembly through a structural adhesive layer, so that the fixing method of the support structure is simple and reliable.

[0047] In some embodiments, the battery cell is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell, and a solid-state battery cell.

[0048] In the above technical scheme, in the embodiment where the battery cell is a lithium iron phosphate battery cell, the safety of the battery cell can be improved and the cycle life of the battery cell can be extended; in the embodiment where the battery cell is a ternary lithium battery cell, the energy density of the battery cell can be improved and the cruising range can be improved; in the embodiment where the battery cell is a solid-state battery cell, not only the energy density can be improved, but also the safety can be improved.

[0049] In some embodiments, when the battery cell is a lithium iron phosphate battery cell, in the positive electrode material of the battery cell, the usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent is 96:(1-3):(1-3); when the battery cell is a ternary lithium battery cell, in the positive electrode material of the battery cell, the usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent is 96:(2-3):(1-2).

[0050] In the above technical scheme, in an embodiment where the battery cell is a lithium iron phosphate battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the electrochemical performance and mechanical stability of the battery cell; in an embodiment where the battery cell is a ternary lithium battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the energy density and cycle life of the battery.

[0051] In a second aspect, the utility model provides a battery device, comprising: a box body; and a plurality of battery cells disposed in the box body, wherein the battery cells are battery cells according to the embodiment of the first aspect of the utility model.

[0052] In the above technical solution, the battery device is provided with the above-mentioned battery cell, which can reduce the occurrence of low capacity or lithium deposition during the cycle due to the deformation of the flexible shell squeezing the internal electrode assembly, so that the battery cell has better cycle performance, thereby improving the cycle performance of the battery device.

[0053] In some embodiments, in the thickness direction of the battery cells, a reinforcing partition is sandwiched between at least some of the adjacent battery cells, and the hardness of the reinforcing partition is greater than the hardness of the flexible shell.

[0054] In the above technical solution, by arranging a reinforcing partition between at least some adjacent battery cells and making the hardness of the reinforcing partition greater than the hardness of the flexible shell, it is convenient to group multiple battery cells, and the overall stiffness of the grouped multiple battery cells can be improved, thereby facilitating the installation of the multiple battery cells after grouping and reducing the deformation of the battery cells after grouping.

[0055] In some embodiments, the reinforcing partition is a metal plate.

[0056] In the above technical solution, by setting the reinforcing partition as a metal plate, the reinforcing partition can have higher strength and hardness, thereby better improving the overall rigidity of the group of multiple battery cells and better reducing the deformation of the group of battery cells.

[0057] In some embodiments, the reinforcing partition is thermally connected to the flexible housing to exchange heat with the battery cell.

[0058] In the above technical solution, by thermally connecting the reinforced partition with the flexible shell, the reinforced partition can enhance the overall stiffness of the battery cells after being grouped, and at the same time, the reinforced partition can have a thermal management function. By strengthening the heat exchange between the partition and the battery cells, the temperature of the battery cells can be adjusted so that the battery cells operate within a suitable temperature range.

[0059] In some embodiments, a cavity is formed in the reinforced partition, and at least a portion of the cavity constitutes a heat exchange channel for the flow of heat exchange medium.

[0060] In the above technical scheme, by setting a cavity in the reinforced partition, while the reinforced partition plays a role in enhancing the overall stiffness of the battery cells after being grouped, the cavity in the reinforced partition can absorb the expansion and deformation of the battery cells, and at the same time, at least part of the cavity in the reinforced partition constitutes a heat exchange channel. When the heat exchange medium flows through the heat exchange channel in the reinforced partition, the heat exchange medium can exchange heat with the battery cells, thereby achieving effective regulation of the battery cell temperature.

[0061] In some embodiments, at least two adjacent reinforcing partitions are connected by a connecting plate, and the connecting plate is located on one side of the battery cell along the width direction of the battery cell. The two adjacent reinforcing partitions and the corresponding connecting plate jointly define a accommodating cavity for accommodating the battery cell.

[0062] In the above technical solution, by connecting at least two adjacent reinforcing partitions through a connecting plate, at least some of the reinforcing partitions can be connected into a whole, and the two adjacent reinforcing partitions and the connecting plate jointly define a accommodating cavity for accommodating the battery monomer, which can further improve the overall stiffness of multiple battery monomers after being grouped.

[0063] In a third aspect, the utility model provides an electrical device, comprising: a battery device according to the embodiment of the second aspect of the utility model.

[0064] In the above technical solution, the electrical device includes the above battery device, which can improve the cycle performance of the battery device.

[0065] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0067] Figure 1 is a schematic diagram of a battery cell according to some embodiments of the present utility model;

[0068] Figure 2 is a cross-sectional schematic diagram of a flexible housing and a supporting structure of a battery cell according to some embodiments of the utility model;

[0069] Figure 3 is a cross-sectional schematic diagram of a support structure of a battery cell according to some embodiments of the utility model;

[0070] Figure 4 It is a schematic diagram of the three-dimensional coordination between the electrode assembly and the support structure of the battery cell according to some embodiments of the utility model;

[0071] Figure 5 yes Figure 4 Front view of the cooperation between the middle electrode assembly and the support structure;

[0072] Figure 6 yes Figure 4 A side view of the cooperation between the middle electrode assembly and the support structure;

[0073] Figure 7 yes Figure 4 A side view of the cooperation between the middle electrode assembly and the support structure from another angle;

[0074] Figure 8 It is a schematic diagram of the three-dimensional coordination of the electrode assembly and the support structure of the battery cell according to other embodiments of the utility model;

[0075] Fig. 9 yes Figure 8 Front view of the cooperation between the middle electrode assembly and the support structure;

[0076] Fig.10 yes Figure 8A side view of the cooperation between the middle electrode assembly and the support structure;

[0077] Fig.11 It is a schematic diagram of the three-dimensional coordination of the electrode assembly and the support structure of the battery cell according to some other embodiments of the utility model;

[0078] Fig.12 yes Fig.11 Front view of the cooperation between the middle electrode assembly and the support structure;

[0079] Fig.13 yes Fig.11 A side view of the cooperation between the middle electrode assembly and the support structure;

[0080] Fig.14 yes Fig.11 A side view of the cooperation between the middle electrode assembly and the support structure from another angle;

[0081] Fig.15 is an exploded schematic diagram of a battery device according to some embodiments of the utility model;

[0082] Fig.16 yes Fig.15 A schematic cross-sectional view of a reinforced partition in FIG.

[0083] Fig.17 It is a schematic diagram of an electrical device according to some embodiments of the utility model.

[0084] Reference numerals:

[0085] 100. Battery cell;

[0086] 10. Flexible shell;

[0087] 20. Support structure; 2. Support plate; 201. Metal substrate; 202. Insulation layer; 21. First support plate; 22. Second support plate; 221. Exhaust hole; 23. Third support plate; 231. Avoidance;

[0088] 30. electrode assembly; 31. electrode tab; 32. electrode terminal;

[0089] 200, battery device; 40, box; 41, first box; 42, second box; 50, reinforcing partition; 51, cavity; 52, connecting plate; 53, accommodating cavity;

[0090] 1000. Electrical device; 300. Vehicle body. DETAILED DESCRIPTION

[0091] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0092] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those generally understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention in the application are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0093] The reference to "embodiment" in the present invention means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places 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.

[0094] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "attachment" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] The term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0096] In the embodiments of the present invention, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present invention shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present invention.

[0097] The term “plurality” used in the present invention refers to two or more (including two).

[0098] In the embodiments of the present invention, unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution.

[0099] In the embodiments of the present invention, unless otherwise specified, all technical features and optional technical features of the present invention can be combined with each other to form a new technical solution.

[0100] In an embodiment of the present invention, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include a plurality of battery cells, which are connected in series, in parallel, or in mixed connection through a busbar. For example, a battery cell assembly is usually formed by arranging a plurality of battery cells; a battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0101] The battery device may be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box. The battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box; the battery cell assembly may also be accommodated in the box by directly fixing a plurality of battery cells to the box.

[0102] In an embodiment of the utility model, the battery case may include a first case and a second case. The first case and the second case are buckled together to form a closed space inside the case to accommodate the battery monomer assembly. The closed here means covering or closing, which can be sealed or unsealed. The first case may be a top cover or a bottom plate. For example, the battery case 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 case to accommodate the battery monomer assembly.

[0103] In an embodiment of the utility model, the battery box can be used as a part of the chassis structure of the vehicle. For example, part of the battery box can become at least a part of the floor of the vehicle, or part of the battery box can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0104] In the embodiment of the utility model, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged; 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 embodiment of the utility model. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiment of the utility model.

[0105] As the smallest energy unit of a battery device, a battery cell includes a flexible housing and an electrode assembly disposed in the flexible housing.

[0106] The electrode assembly is the part of the battery cell where the electrochemical reaction occurs. One or more electrode assemblies may be contained in the flexible housing. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located at both ends of the main body, respectively.

[0107] The positive electrode sheet may include a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer includes a positive electrode active material.

[0108] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0109] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, silver surface treated aluminum or stainless steel, 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.).

[0110] As an example, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; alternatively, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the battery cell 100. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0111] Examples of 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.

[0112] Layered transition metal oxides include Li a Ni b Co c M d O e A f At least one of the compounds and modified compounds thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0113] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi0.8Co 0.1 Mn 0.1O2 (also referred to as NCM811), LiNi 0.9 Co 0.05 Mn 0.05 O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0114] In the embodiments of the present application, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0115] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen is only a theoretical value. Oxygen release from the lattice will cause the molar content of oxygen to change. In reality, the molar content of oxygen will fluctuate.

[0116] In the embodiments of the present application, the content of the elements in the positive electrode active material has a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of the positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180°C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0117] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foamed metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0118] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present application embodiment has no particular restrictions on the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0119] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiment of the present application has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0120] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder and any other components in a solvent and stirring them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0121] In some embodiments, the negative electrode may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0122] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0123] As an example, the negative electrode current collector may be a metal foil, a foamed metal 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, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may include a polymer material base 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.).

[0124] As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 100 known in the art. As an example, the negative electrode active material may include at least one of the following materials: a carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material may include at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other traditional materials that can be used as a negative electrode film layer of a battery may also be used. These negative electrode film layers may be used alone or in combination of two or more.

[0125] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, such as a silicon-based material that may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can increase the energy density of the battery cell 100.

[0126] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. When the mass content of silicon is within the above range, the energy density of the battery cell 100 can be increased.

[0127] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is immersed in a solvent such as water, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, and with reference to GB / T30902-2014 standard to obtain the silicon content.

[0128] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The embodiment of the present application has no particular restrictions on the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0129] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The embodiment of the present application has no particular restrictions on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA) and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0130] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0131] 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.

[0132] In some embodiments, the separator includes 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.

[0133] The embodiments of the present application have no particular restrictions on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0134] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0135] In some embodiments, the isolation membrane may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0136] The porous base membrane may include one or more of polyethylene and polypropylene.

[0137] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0138] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, aluminum oxide Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, zirconium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0139] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0140] In some embodiments, the electrolyte in the battery cell includes an electrolyte salt and a solvent. The types of the electrolyte salt and the solvent are not specifically limited and can be selected according to actual needs.

[0141] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0142] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0143] In the related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment, aerospace and other fields. Batteries can be roughly divided into soft-pack batteries and hard-shell batteries according to the hardness of the shell. Soft-pack batteries have the advantages of high mass / volume energy density and good safety, making the application of soft-pack batteries more and more extensive.

[0144] Due to the characteristics of the shell of the soft-pack battery, when multiple soft-pack battery cells are assembled into a group, the soft-pack battery is subjected to external forces, such as the assembly force applied during assembly, the squeezing force of other structures in the box on the soft-pack battery, and the squeezing force of local particles on the soft-pack battery. The shell of the soft-pack battery is easily squeezed and deformed, thereby squeezing the pole piece located in the shell, reducing the cycle performance of the battery, such as causing low capacity or lithium precipitation during the cycle. Therefore, how to reduce the problem of the shell deformation of the soft-pack battery and squeezing the pole piece to cause the battery performance to deteriorate is a technical problem to be solved.

[0145] Based on this, the utility model proposes a battery cell, including: a flexible shell, an electrode assembly and a support structure, the electrode assembly is arranged in the flexible shell, the support structure is arranged in the flexible shell and is located between the electrode assembly and the flexible shell, the hardness of the support structure is greater than the hardness of the flexible shell, and the hardness of the support structure is HB30~HB80.

[0146] In the above-mentioned battery cell, by arranging a support structure in the flexible shell and making the support structure between the electrode assembly and the flexible shell, and making the hardness of the support structure greater than the hardness of the flexible shell, the support structure can play a role in supporting the flexible shell, and when the battery cell is subjected to external force, the deformation of the flexible shell can be reduced, thereby reducing the occurrence of low capacity or lithium precipitation during the cycle caused by squeezing the internal electrode assembly due to the deformation of the flexible shell, so that the battery cell has better cycle performance. In addition, by setting the hardness of the support structure at HB30 to HB80, the support structure can effectively support the flexible shell while making the hardness of the support structure moderate, and still has the advantages of higher mass / volume energy density and better safety compared to hard shell batteries.

[0147] The battery device disclosed in the embodiment of the utility model can be used in electrical equipment that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. In addition to being used in vehicles, the battery device can also be used for, but not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecrafts, etc.

[0148] The power-consuming device disclosed in the embodiments of the utility model may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the utility model, the battery device may be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0149] Reference below Figure 1-Figure 14 A battery cell 100 according to an embodiment of the present invention is described.

[0150] refer to Figure 1-Figure 2 In the first aspect, the utility model provides a battery cell 100, including: a flexible shell 10, an electrode assembly 30 and a support structure 20, the electrode assembly 30 is arranged in the flexible shell 10, the support structure 20 is arranged in the flexible shell 10 and the support structure 20 is located between the electrode assembly 30 and the flexible shell 10, the hardness of the support structure 20 is greater than the hardness of the flexible shell 10, and the hardness of the support structure 20 is HB30~HB80.

[0151] The flexible housing 10 of the battery cell 100 has good flexibility. The flexible housing 10 may be formed into a pouch type, and the electrode assembly 30 is accommodated in the flexible housing 10 , so that the battery cell 100 is a soft-pack battery.

[0152] The electrode assembly 30 of the battery cell 100 may be a wound electrode assembly 30 or a stacked electrode assembly 30. The electrode assembly 30 includes a pole piece and a pole ear 31. The electrode assembly 30 may be formed by winding pole pieces or stacking pole pieces.

[0153] The battery cell 100 may include an electrode terminal 32 , which may be connected to the tab 31 , and at least a portion of the electrode terminal 32 may be located outside the flexible housing 10 as a lead-out structure of the electrode assembly 30 . The electrode terminal 32 may be used to electrically connect the battery cell 100 to other battery cells 100 .

[0154] The hardness of the support structure 20 is greater than the hardness of the flexible shell 10, and the support structure 20 can provide support for the flexible shell 10 to reduce the deformation of the flexible shell 10. For example, in the process of assembling a plurality of battery cells 100 in groups, the battery cells 100 may be subjected to the applied assembly force, the squeezing force of other structures in the box 40 on the soft-pack battery, and the squeezing force of local particles on the soft-pack battery. By arranging the support structure 20 in the flexible shell 10 to support the flexible shell 10, when the battery cell 100 is subjected to external force, the deformation of the flexible shell 10 can be reduced because the support structure 20 supports the flexible shell 10, thereby reducing the squeezing of the electrode assembly 30 inside the flexible shell 10 due to deformation.

[0155] For example, when the battery cells 100 are grouped and fixed in the box body 40 by structural adhesive, it is necessary to apply force to the battery cells 100 during the process of applying structural adhesive to the battery cells 100. By setting a support structure 20 in the flexible shell 10, since the support structure 20 can provide support for the flexible shell 10, in the process of applying glue to the outer surface of the flexible shell 10, it is convenient to apply force when the glue is fixed, and the deformation of the flexible shell 10 caused by the glue force applied to the battery cells 100 during the glue application process can be reduced.

[0156] Furthermore, while the hardness of the support structure 20 is made not less than HB30 to provide effective support for the flexible shell 10, the hardness of the support structure 20 is limited to not more than HB80. This can reduce the damage or scratches of the electrode assembly 30 and the flexible shell 10 by the support structure 20 during the assembly process, and can also make the support structure 20 and the flexible shell 10 as a whole still have good flexibility relative to the shell of the hard shell battery, and still have the advantages of higher mass / volume energy density and better safety compared to the hard shell battery.

[0157] In the above technical solution, by arranging the support structure 20 in the flexible shell 10 and making the support structure 20 between the electrode assembly 30 and the flexible shell 10, and making the hardness of the support structure 20 greater than the hardness of the flexible shell 10, the support structure 20 can play a role in supporting the flexible shell 10, and when the battery cell 100 is subjected to external force, the deformation of the flexible shell 10 can be reduced, thereby reducing the occurrence of low capacity or lithium precipitation during the cycle caused by the deformation of the flexible shell 10 and squeezing the internal electrode assembly 30, so that the battery cell 100 has better cycle performance. In addition, by setting the hardness of the support structure 20 at HB30 to HB80, the support structure 20 can effectively support the flexible shell 10 while making the hardness of the support structure 20 moderate, and still has the advantages of higher mass / volume energy density and better safety compared to hard shell batteries.

[0158] In some embodiments, the support structure 20 includes a metal substrate 201 and an insulating layer 202 , wherein the insulating layer 202 covers a side of the metal substrate 201 facing the electrode assembly 30 .

[0159] In the above technical solution, by making the support structure 20 include a metal substrate 201 and an insulating layer 202 arranged on the side facing the electrode assembly 30, the support structure 20 can have a higher hardness relative to the flexible shell 10 to achieve effective support for the flexible shell 10, and the insulating layer 202 can insulate and separate the metal substrate 201 of the support structure 20 from the electrode assembly 30, thereby improving the safety of the battery cell 100.

[0160] In some embodiments, the metal substrate 201 is an aluminum alloy substrate, a steel substrate, or a copper substrate.

[0161] In the above technical solution, by setting the metal substrate 201 of the support structure 20 to an aluminum alloy substrate, a steel substrate or a copper substrate, the support structure 20 can have higher hardness and strength relative to the flexible shell 10, thereby providing effective support for the flexible shell 10 and reducing the extrusion of the internal electrode assembly 30 caused by deformation of the flexible shell 10.

[0162] In some embodiments, support structure 20 is a piece of polymer material.

[0163] In the above technical solution, by setting the support structure 20 as a polymer material, the support structure 20 has greater hardness and strength relative to the flexible shell 10, and the density of the support structure 20 can also be reduced, which is beneficial to improving the mass energy density of the battery cell 100.

[0164] In some embodiments, support structure 20 is a piece of polypropylene foam material.

[0165] In the above technical solution, by setting the support structure 20 as a polypropylene foam material piece, the support structure 20 can have greater hardness and strength relative to the flexible shell 10, and at the same time, the density of the support structure 20 can be smaller, which is beneficial to improving the mass energy density of the battery cell 100.

[0166] In some embodiments, reference Figure 2-Figure 4 The support structure 20 includes a plurality of support plates 2 , and the plurality of support plates 2 are distributed on different sides of the electrode assembly 30 .

[0167] The plurality of support plates 2 may be independent of each other, for example, there is no connection between the plurality of support plates 2. Alternatively, at least some of the plurality of support plates 2 may be connected, for example, the plurality of support plates 2 may be connected as a whole.

[0168] In the above technical solution, by setting the support structure 20 to include multiple support plates 2 and the multiple support plates 2 are distributed on different sides of the electrode assembly 30, the multiple support plates 2 can support the flexible shell 10 at different positions. When different sides of the battery cell 100 are subjected to external forces, the extrusion of the internal electrode assembly 30 caused by the deformation of the flexible shell 10 can be better reduced.

[0169] In some embodiments, reference Figure 2 , the thickness d1 of the support plate 2 is 0.1 mm to 0.7 mm.

[0170] For example, the thickness of the support plate 2 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, etc.

[0171] In the above technical solution, by making the thickness of the support plate 2 not less than 0.1 mm, the support plate 2 can have higher rigidity and strength relative to the flexible shell 10, making the support plate 2 less likely to deform, thereby providing better support for the flexible shell 10, and by making the thickness of the support plate 2 not more than 0.7 mm, the space occupied by the support plate 2 in the flexible shell 10 can be reduced, thereby increasing the energy density of the battery cell 100.

[0172] In some embodiments, the support plate 2 includes a metal substrate 201 and an insulating layer 202 , the insulating layer 202 covers the side of the metal substrate 201 facing the electrode assembly 30 , the metal substrate 201 is an aluminum alloy substrate, and the thickness of the support plate 2 is 0.5 mm to 0.7 mm.

[0173] For example, when the support plate 2 includes a metal substrate 201 and an insulating layer 202, and the metal substrate 201 is an aluminum alloy substrate, the thickness of the support plate 2 can be 0.5 mm, 0.6 mm, 0.7 mm, etc.

[0174] In the above technical solution, by making the support plate 2 include a metal substrate 201 and an insulating layer 202 arranged on the side facing the electrode assembly 30, the support plate 2 can have a higher hardness relative to the flexible shell 10 to achieve effective support for the flexible shell 10, and the insulating layer 202 can be arranged to insulate and separate the metal substrate 201 of the support plate 2 from the electrode assembly 30, thereby improving the safety of the battery cell 100. And, on this basis, the metal substrate 201 is set as an aluminum alloy substrate, so that the support plate 2 has higher hardness and strength while also having a lower density, which is beneficial to making the energy density of the battery cell 100 higher; further, while the metal substrate 201 of the support plate 2 is set as an aluminum alloy substrate, the thickness of the metal substrate 201 is set at 0.5mm~0.7mm, so that the support plate 2 can have higher rigidity and strength relative to the flexible shell 10, making the support plate 2 less likely to deform, thereby providing better support for the flexible shell 10, and reducing the space occupied by the support plate 2 in the flexible shell 10, so that the energy density of the battery cell 100 is higher.

[0175] In some embodiments, the support plate 2 includes a metal substrate 201 and an insulating layer 202 , the insulating layer 202 covers the side of the metal substrate 201 facing the electrode assembly 30 , the metal substrate 201 is a steel substrate, and the thickness of the support plate 2 is 0.2 mm to 0.4 mm.

[0176] For example, when the support plate 2 includes a metal substrate 201 and an insulating layer 202, and the metal substrate 201 is a steel substrate, the thickness of the support plate 2 may be 0.2 mm, 0.3 mm, 0.4 mm, or the like.

[0177] In the above technical solution, by making the support plate 2 include a metal substrate 201 and an insulating layer 202 disposed on the side facing the electrode assembly 30, the support plate 2 can have a higher hardness relative to the flexible housing 10, so as to achieve an effective support function for the flexible housing 10, and the insulating layer 202 can insulate and separate the metal substrate 201 of the support plate 2 from the electrode assembly 30, thereby improving the safety of the battery cell 100. Moreover, on this basis, the metal substrate 201 is set as a steel substrate and the thickness of the metal substrate 201 is set at 0.2 mm to 0.4 mm, so that the support plate 2 can have a higher rigidity and strength relative to the flexible housing 10, so that the support plate 2 is less likely to deform, thereby playing a better supporting role for the flexible housing 10, and can reduce the space occupied by the support plate 2 in the flexible housing 10, so that the energy density of the battery cell 100 is higher.

[0178] In some embodiments, the support plate 2 includes a metal substrate 201 and an insulating layer 202 , the insulating layer 202 covers the side of the metal substrate 201 facing the electrode assembly 30 , the metal substrate 201 is a copper substrate, and the thickness of the support plate 2 is 0.4 mm to 0.6 mm.

[0179] For example, when the support plate 2 includes a metal substrate 201 and an insulating layer 202, and the metal substrate 201 is a copper substrate, the thickness of the support plate 2 may be 0.4 mm, 0.5 mm, or 0.6 mm.

[0180] In the above technical solution, by making the support plate 2 include a metal substrate 201 and an insulating layer 202 disposed on the side facing the electrode assembly 30, the support plate 2 can have a higher hardness relative to the flexible housing 10, so as to achieve an effective support function for the flexible housing 10, and the insulating layer 202 can insulate and separate the metal substrate 201 of the support plate 2 from the electrode assembly 30, thereby improving the safety of the battery cell 100. Moreover, on this basis, the metal substrate 201 is set as a copper substrate and the thickness of the metal substrate 201 is set at 0.4 mm to 0.6 mm, so that the support plate 2 can have a higher rigidity and strength relative to the flexible housing 10, so that the support plate 2 is less likely to deform, thereby playing a better supporting role for the flexible housing 10, and can reduce the space occupied by the support plate 2 in the flexible housing 10, so that the energy density of the battery cell 100 is higher.

[0181] In some embodiments, reference Figure 2 , the thickness d1 of the support plate 2 is greater than or equal to the thickness d2 of the flexible shell 10 .

[0182] In the above technical solution, by making the thickness of the support plate 2 not less than the thickness of the flexible shell 10, the hardness of the support plate 2 can be made greater than that of the flexible shell 10, and the support plate 2 can have higher rigidity and strength, so that the support plate 2 is less likely to deform and can provide better support for the flexible shell 10.

[0183] In some embodiments, reference Figure 4-Figure 7 The plurality of support plates 2 include two first support plates 21 , and the two first support plates 21 are located at opposite sides of the electrode assembly 30 in the thickness direction.

[0184] The thickness direction of the electrode assembly 30 refers to the direction perpendicular to the large surface of the electrode assembly 30, and the large surface of the electrode assembly 30 refers to the surface with the largest area among the surfaces on different sides of the electrode assembly 30. For example, the thickness direction of the electrode assembly 30 can refer to the e1 direction in the figure.

[0185] In the above technical solution, by arranging two of the multiple support plates 2 on opposite sides in the thickness direction of the electrode assembly 30, the large surface of the flexible shell 10 can be effectively supported, and the deformation of the large surface position of the flexible shell 10 and the squeezing of the internal electrode assembly 30 can be effectively reduced.

[0186] In some embodiments, reference Figure 4-Figure 6 In the width direction of the electrode assembly 30 , the ratio of the width W1 of the first support plate 21 to the width W2 of the electrode assembly 30 is greater than or equal to 1 / 3.

[0187] The length direction of the electrode assembly 30 refers to the direction in which the tabs 31 of the electrode assembly 30 are led out, and the tabs 31 of the electrode assembly 30 are located on one or both sides of the electrode assembly 30 along the length direction of the electrode assembly 30. The width direction of the electrode assembly 30 intersects with the thickness direction of the electrode assembly 30, and the width direction of the electrode assembly 30 intersects with the length direction of the electrode assembly 30. For example, the width direction of the electrode assembly 30 can refer to the e2 direction in the accompanying drawings.

[0188] For example, the ratio of the width of the first support plate 21 to the width of the electrode assembly 30 may be 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, 4 / 5, 1, or the like.

[0189] In the above technical solution, by setting the ratio of the size of the first support plate 21 in the width direction to the size of the electrode assembly 30 to be greater than or equal to 1 / 3, the first support plate 21 can have a larger supporting area for the large surface of the flexible shell 10, thereby achieving a better supporting effect.

[0190] In some embodiments, reference Figure 4-Figure 7 In the length direction of the electrode assembly 30 , the ratio of the length L1 of the first support plate 21 to the length L2 of the electrode assembly 30 is greater than or equal to 1 / 3.

[0191] The length direction of the electrode assembly 30 refers to the direction in which the electrode tabs 31 of the electrode assembly 30 are led out. The electrode tabs 31 of the electrode assembly 30 are located on one side or both sides of the electrode assembly 30 along the length direction of the electrode assembly 30 .

[0192] The length of the electrode assembly 30 does not include the size of the electrode tab 31 , and the length of the electrode assembly 30 refers to the length dimension of the main structure of the electrode assembly 30 excluding the electrode tab 31 in the length direction of the electrode assembly 30 .

[0193] For example, the length direction of the electrode assembly 30 may refer to the direction e3 in the drawings.

[0194] For example, the ratio of the length of the first support plate 21 to the length of the electrode assembly 30 may be 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, 4 / 5, 1, or the like.

[0195] In the above technical solution, by setting the ratio of the length dimension of the first support plate 21 to the dimension of the electrode assembly 30 to be greater than or equal to 1 / 3, the first support plate 21 can have a larger supporting area for the large surface of the flexible shell 10, thereby achieving a better supporting effect.

[0196] In some embodiments, reference Figure 8-Figure 10 The multiple support plates 2 include a second support plate 22, which is connected between the two first support plates 21. The second support plate 22 is located on at least one side in the width direction of the electrode assembly 30, and the electrode ear 31 of the electrode assembly 30 is located on at least one side of the electrode assembly 30 along the length direction of the electrode assembly 30.

[0197] For example, when the plurality of support plates 2 include one second support plate 22, the second support plate 22 may be located at one side in the width direction of the electrode assembly 30, and the second support plate 22 is connected to both first support plates 21. For another example, when the plurality of support plates 2 include two second support plates 22, the two second support plates 22 are respectively located at both sides in the width direction of the electrode assembly 30, and each second support plate 22 is connected to the two first support plates 21.

[0198] The electrode lug 31 of the electrode assembly 30 is located on at least one side of the electrode assembly 30 along the length direction of the electrode assembly 30. The electrode assembly 30 includes two electrode lugs 31, one of the two electrode lugs 31 is a positive electrode lug 31 and the other of the two electrode lugs 31 is a negative electrode lug 31. The two electrode lugs 31 of the electrode assembly 30 can be located on the same side of the length direction of the electrode assembly 30, or the two electrode lugs 31 of the electrode assembly 30 can also be located on both sides of the electrode assembly 30 along the length direction.

[0199] In the above technical solution, by arranging the second support plate 22 among the multiple support plates 2 on at least one side in the width direction of the electrode assembly 30, the second support plate 22 can support the side surface of the flexible shell 10 in the width direction, thereby reducing the deformation of the side surface of the flexible shell 10 in the width direction and squeezing the internal electrode assembly 30; and, by connecting the second support plate 22 to the first support plates 21 on both sides, the overall strength and stability of the support structure 20 can be improved, thereby better supporting the flexible shell 10.

[0200] In some embodiments, reference Figure 11-Figure 14The plurality of support plates 2 include a third support plate 23 , which is connected to at least one of the first support plate 21 and the second support plate 22 , and is located at at least one side of the electrode assembly 30 in the length direction.

[0201] For example, when the multiple support plates 2 include a third support plate 23, the third support plate 23 can be located on one side of the length direction of the electrode assembly 30; for another example, when the multiple support plates 2 include two third support plates 23, the two third support plates 23 are respectively located on both sides of the length direction of the electrode assembly 30.

[0202] The third support plate 23 is connected to at least one of the first support plate 21 and the second support plate 22, which may include the following situations: for example, the third support plate 23 is connected to the first support plate 21, so that the third support plate 23 and the first support plate 21 are connected as a whole; for example, the third support plate 23 is connected to the second support plate 22, so that the third support plate 23 and the second support plate 22 are connected as a whole; for example, the third support plate 23 is connected to the first support plate 21 and the third support plate 23 is connected to the second support plate 22, so that the third support plate 23, the second support plate 22 and the first support plate 21 are connected as a whole.

[0203] In the above technical solution, by setting the plurality of support plates 2 to include a third support plate 23, so that the third support plate 23 is located on at least one side in the length direction of the electrode assembly 30, the third support plate 23 can support the side surface in the length direction of the flexible shell 10, thereby reducing the deformation of the side surface in the length direction of the flexible shell 10 and squeezing the internal electrode assembly 30; and, by connecting the third support plate 23 to at least one of the first support plate 21 and the second support plate 22, the overall strength and stability of the support structure 20 can be improved, thereby better supporting the flexible shell 10.

[0204] In some embodiments, reference Figure 11-Figure 14 The third support plate 23 is formed with an escape opening 231 for escaping the pole ear 31 .

[0205] When the third support plate 23 covers the side of the electrode assembly 30 along the length direction of the electrode assembly 30 as much as possible, the avoidance opening 231 is provided on the third support plate 23, so that the electrode tab 31 can be conveniently led out through the avoidance opening 231. The shape and size of the avoidance opening 231 can match the electrode tab 31.

[0206] In the above technical solution, by providing the avoidance opening 231 for avoiding the pole lug 31 on the third support plate 23 , the avoidance opening 231 can facilitate the leading out of the pole lug 31 while making the third support plate 23 have a larger supporting area as much as possible.

[0207] In some embodiments, reference Figure 11-Figure 14 At least a portion of the support plate 2 is formed with an exhaust hole 221 , and the exhaust hole 221 penetrates the support plate 2 along the thickness direction of the support plate 2 .

[0208] For example, the exhaust holes 221 may be formed on some of the support plates 2 , or the exhaust holes 221 may be formed on each of the support plates 2 .

[0209] Among them, one or more exhaust holes 221 can be formed on a single support plate 2. When multiple exhaust holes 221 are formed on a single support plate 2, the spacing between the exhaust holes 221 can be greater than the aperture of the exhaust holes 221. In this way, while the exhaust holes 221 are formed on the support plate 2, the structural strength and rigidity of the support plate 2 can still be high.

[0210] In the above technical solution, by setting exhaust holes 221 on at least part of the support plate 2, when the battery cell 100 is working, the high-temperature substances generated in the electrode assembly 30 can be arranged to the outside of the support structure 20 through the exhaust holes 221, thereby reducing the accumulation of high-temperature substances inside the electrode assembly 30 and improving the safety of the battery cell 100.

[0211] In some embodiments, reference Figure 11-Figure 14 The multiple support plates 2 include a first support plate 21 and a second support plate 22. There are two first support plates 21, and the two first support plates 21 are located on opposite sides of the electrode assembly 30 in the thickness direction. The second support plate 22 is connected between the two first support plates 21. The second support plate 22 is located on at least one side in the width direction of the electrode assembly 30, and an exhaust hole 221 is formed on the second support plate 22.

[0212] For example, when the multiple support plates 2 include one second support plate 22, the second support plate 22 can be located on one side of the electrode assembly 30 in the width direction; for another example, when the multiple support plates 2 include two second support plates 22, the two second support plates 22 are respectively located on both sides of the electrode assembly 30 in the width direction.

[0213] When there is one second support plate 22, the second support plate 22 is formed with an exhaust hole 221; when there are two second support plates 22, the exhaust hole 221 may be formed on at least one second support plate 22, for example, the exhaust hole 221 may be formed on one of the second support plates 22, or the exhaust hole 221 may be formed on both second support plates 22. When the exhaust hole 221 is formed on the second support plate 22, there may be multiple exhaust holes 221 on a single second support plate 22, and the multiple exhaust holes 221 may be arranged at intervals along the length direction of the second support plate 22.

[0214] In the above technical solution, by setting the plurality of support plates 2 to include the first support plates 21 located on both sides of the electrode assembly 30 in the thickness direction and the second support plate 22 located on at least one side of the electrode assembly 30 in the width direction, the first support plate 21 can effectively support the large surface of the flexible shell 10, which can effectively reduce the deformation of the large surface position of the flexible shell 10 and the squeezing of the internal electrode assembly 30, and the second support plate 22 can support the side surface of the flexible shell 10 in the width direction, which can reduce the deformation of the side surface of the flexible shell 10 in the width direction and the squeezing of the internal electrode assembly 30; and, by setting the exhaust hole 221 on the second support plate 22, the electric The high-temperature substances generated in the electrode assembly 30 can be arranged to the outside of the support structure 20 through the exhaust holes 221, thereby reducing the accumulation of high-temperature substances inside the electrode assembly 30 and improving the safety of the battery cell 100; in addition, compared with setting the exhaust holes 221 on the first support plate 21, setting the exhaust holes 221 on the second support plate 22 can achieve the discharge of the high-temperature substances generated in the electrode assembly 30 while maintaining a high structural strength and rigidity of the first support plate 21, so that the first support plate 21 can provide better support for the large surface of the flexible shell 10, and better reduce the deformation of the large surface of the flexible shell 10 and the squeezing of the internal electrode assembly 30.

[0215] In some embodiments, the flexible housing 10 is an aluminum-plastic film; or, the hardness of the flexible housing 10 is HB16-HB22.

[0216] In the above technical solution, by setting the flexible shell 10 as an aluminum-plastic film or setting the hardness of the flexible shell 10 to HB16-HB22, the hardness of the flexible shell 10 can be lower. In the event of thermal runaway, due to the lower hardness of the flexible shell 10, the flexible shell 10 is more likely to crack under the action of internal pressure, which can reduce the risk of explosion of the battery cell 100; and, due to the lower hardness of the flexible shell 10, the flexible shell 10 can be more tightly covered on the outside of the electrode assembly 30 and the support structure 20, reducing the gap between the flexible shell 10 and the electrode assembly 30, which is beneficial to improving the energy density of the battery cell 100.

[0217] In some embodiments, the support structure 20 is fixed to the inner wall of the flexible housing 10 or the outer wall of the electrode assembly 30 .

[0218] When the support structure 20 is fixed to the inner wall of the flexible housing 10, the support structure 20 can be first fixed to the inner wall of the flexible housing 10, and then the electrode assembly 30 is installed in the flexible housing 10 so that the support structure 20 is located between the electrode assembly 30 and the flexible housing 10. When the support structure 20 is fixed to the outer wall of the electrode assembly 30, the support structure 20 can be first fixed to the outer wall of the electrode assembly 30, and then the support structure 20 and the electrode assembly 30 are installed in the flexible housing 10 as a whole.

[0219] In the above technical solution, by fixing the support structure 20 on the inner wall of the flexible shell 10 or the outer wall of the electrode assembly 30 , the support structure 20 can be more stably installed in the flexible shell 10 , thereby providing better support for the flexible shell 10 .

[0220] In some embodiments, the support structure 20 is connected to the flexible housing 10 or the electrode assembly 30 via a structural adhesive layer.

[0221] When the support structure 20 is fixed on the flexible shell 10, the support structure 20 can be fixed to the inner wall of the flexible shell 10 through the structural adhesive layer; when the support structure 20 is fixed on the electrode assembly 30, the support structure 20 can be fixed to the outer wall of the electrode assembly 30 through the structural adhesive layer.

[0222] In the above technical solution, the support structure 20 is connected to the flexible housing 10 or the electrode assembly 30 via a structural adhesive layer, so that the fixing method of the support structure 20 is simple and reliable.

[0223] In some embodiments, the battery cell 100 is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell, and a solid-state battery cell.

[0224] For example, the battery cell 100 may be a lithium iron phosphate battery cell; for another example, the battery cell 100 may be a ternary lithium battery cell; for another example, the battery cell 100 may be a solid-state battery cell.

[0225] In the above technical scheme, in the embodiment where the battery cell 100 is a lithium iron phosphate battery cell, the safety of the battery cell 100 can be improved and the cycle life of the battery cell 100 can be extended; in the embodiment where the battery cell 100 is a ternary lithium battery cell, the energy density of the battery cell 100 can be improved and the cruising range can be improved; in the embodiment where the battery cell 100 is a solid-state battery cell, not only the energy density can be improved, but also the safety can be improved.

[0226] In some embodiments, when the battery cell 100 is a lithium iron phosphate battery cell, the ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material of the battery cell 100 is 96:(1-3):(1-3); when the battery cell 100 is a ternary lithium battery cell, the ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material of the battery cell 100 is 96:(2-3):(1-2).

[0227] The usage ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent refers to the mass ratio of the positive electrode active material, the positive electrode binder and the positive electrode conductive agent.

[0228] The dosage ratio is 96:1-3:1-3, including the following situations: dosage ratio is 96:1:1, 96:1:2, 96:1:3, 96:2:1, 96:2:3, 96:3:1, 96:3:2, 96:3:3, etc.

[0229] The dosage ratio is 96:2-3:1-2, including the following situations: the dosage ratio is 96:2:1, 96:2:2, 96:3:1, 96:3:2, etc.

[0230] In the above technical scheme, in an embodiment where the battery cell 100 is a lithium iron phosphate battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the electrochemical performance and mechanical stability of the battery cell 100; in an embodiment where the battery cell 100 is a ternary lithium battery cell, the positive electrode active material, the positive electrode binder and the positive electrode conductive agent in the positive electrode material adopt the above ratio, which can improve the energy density and cycle life of the battery cell 100.

[0231] Second, refer to Fig.15 The present invention provides a battery device 200, comprising: a box body 40 and a plurality of battery cells 100, wherein the plurality of battery cells 100 are disposed in the box body 40, and the battery cells 100 are the battery cells 100 according to the first embodiment of the present invention.

[0232] The box body 40 may include a first box body 41 and a second box body 42 . The first box body 41 and the second box body 42 may be detachably connected. For example, the first box body 41 and the second box body 42 are connected by fasteners. The first box body 41 may be located on the upper side of the second box body 42 .

[0233] For example, at least some of the battery cells 100 may be arranged along a thickness direction of the battery cells 100 .

[0234] In the above technical solution, the battery device 200 is configured to include the above-mentioned battery cell 100, which can reduce the occurrence of low capacity or lithium deposition during the cycle due to the deformation of the flexible shell 10 and the squeezing of the internal electrode assembly 30, so that the battery cell 100 has better cycle performance, thereby improving the cycle performance of the battery device 200.

[0235] In some embodiments, reference Fig.15 In the thickness direction of the battery cells 100 , a reinforcing partition 50 is sandwiched between at least some of the adjacent battery cells 100 , and the hardness of the reinforcing partition 50 is greater than the hardness of the flexible housing 10 .

[0236] A reinforcing partition 50 is disposed between at least some adjacent battery cells 100 , including the following situations: a reinforcing partition 50 is disposed between some adjacent battery cells 100 , and no reinforcing partition 50 is disposed between another part of adjacent battery cells 100 ; or a reinforcing partition 50 is disposed between every two adjacent battery cells 100 .

[0237] The reinforcing spacer 50 may be bonded and fixed to the flexible casing 10 of the battery cell 100 .

[0238] The ratio of the width of the reinforcing partition 50 in the width direction of the battery cell 100 to the width of the battery cell 100 may be 0.7-1; the ratio of the length of the reinforcing partition 50 in the length direction of the battery cell 100 to the length of the battery cell 100 may be 0.7-1.

[0239] In the above technical solution, by arranging a reinforcing partition 50 between at least part of adjacent battery cells 100 and making the hardness of the reinforcing partition 50 greater than the hardness of the flexible shell 10, it is convenient to group multiple battery cells 100, and the overall stiffness of the grouped multiple battery cells 100 can be improved, thereby facilitating the installation of the multiple battery cells 100 after grouping and reducing the deformation of the battery cells 100 after grouping.

[0240] In some embodiments, the reinforcing spacer 50 is a metal plate.

[0241] For example, the reinforcing partition plate 50 may be an aluminum plate, an aluminum alloy plate, a steel plate, a copper plate, or the like.

[0242] In the above technical solution, by setting the reinforcing partition 50 as a metal plate, the reinforcing partition 50 can have higher strength and hardness, thereby better improving the overall rigidity of the group of multiple battery cells 100 and better reducing the deformation of the group of battery cells 100.

[0243] In some embodiments, the reinforcing separator 50 is thermally connected to the flexible housing 10 to exchange heat with the battery cell 100 .

[0244] For example, the reinforcing partition 50 may be connected to the flexible housing 10 of the battery cell 100 through a thermally conductive adhesive layer. When the battery cell 100 is working, the reinforcing partition 50 may exchange heat with the battery cell 100 to adjust the temperature of the battery cell 100. For example, by exchanging heat between the reinforcing partition 50 and the battery cell 100, the temperature of the battery cell 100 may be increased or decreased as needed.

[0245] In the above technical solution, by thermally connecting the reinforcing partition 50 with the flexible shell 10, the reinforcing partition 50 can enhance the overall stiffness of the battery cells 100 after being grouped, and at the same time, the reinforcing partition 50 can have a thermal management function. Through the heat exchange between the reinforcing partition 50 and the battery cells 100, the temperature of the battery cells 100 can be adjusted so that the battery cells 100 operate within a suitable temperature range.

[0246] In some embodiments, reference Fig.16 A cavity 51 is formed in the reinforcing partition 50, and at least a portion of the cavity 51 constitutes a heat exchange channel for the flow of heat exchange medium.

[0247] At least part of the cavity 51 constitutes a heat exchange channel for the flow of heat exchange medium, which may include the following situations: part of the cavity 51 constitutes the heat exchange channel, or the cavity 51 in the entire reinforced partition 50 serves as the heat exchange channel.

[0248] The heat exchange medium may be liquid, for example, the heat exchange medium may be water or a mixture of water and other media.

[0249] For example, the cavity 51 in the reinforced partition 50 may be a plurality of cavities 51 that are separated from each other, the plurality of cavities 51 may be arranged at intervals along the width direction of the reinforced partition 50 , and each cavity 51 may extend along the length direction of the reinforced partition 50 .

[0250] In the above technical solution, by setting a cavity 51 in the reinforcing partition 50, while the reinforcing partition 50 plays a role in enhancing the overall stiffness of the battery cells 100 after being grouped, the cavity 51 in the reinforcing partition 50 can absorb the expansion and deformation of the battery cells 100, and at the same time, at least part of the cavity 51 in the reinforcing partition 50 constitutes a heat exchange channel. When the heat exchange medium flows through the heat exchange channel in the reinforcing partition 50, the heat exchange medium can exchange heat with the battery cells 100, thereby effectively adjusting the temperature of the battery cells 100.

[0251] In some embodiments, reference Fig.15At least two adjacent reinforcing partitions 50 are connected by a connecting plate 52. The connecting plate 52 is located on one side of the battery cell 100 along the width direction of the battery cell 100. The two adjacent reinforcing partitions 50 and the corresponding connecting plate 52 jointly define a accommodating cavity 53 for accommodating the battery cell 100.

[0252] At least some of the adjacent two reinforcing partitions 50 are connected by a connecting plate 52 , which may include the following situations: for example, some of the adjacent two reinforcing partitions 50 may be connected by a connecting plate 52 , or every two adjacent reinforcing partitions 50 may be connected by a connecting plate 52 .

[0253] The common accommodating cavity 53 of two adjacent reinforcing partitions 50 and the corresponding connecting plates 52 can accommodate one or more battery cells 100 .

[0254] For example, in Fig.15 In the example, every two adjacent reinforcing partitions 50 are connected by a connecting plate 52, so that multiple reinforcing partitions 50 and connecting plates 52 can be connected to form a whole, which can further enhance the rigidity and strength of the group of multiple battery cells 100.

[0255] In the above technical solution, by connecting at least two adjacent reinforcing partitions 50 through a connecting plate 52, at least some of the reinforcing partitions 50 can be connected into a whole, and the two adjacent reinforcing partitions 50 and the connecting plate 52 jointly define a accommodating cavity 53 for accommodating the battery cell 100, which can further improve the overall stiffness of the multiple battery cells 100 after being grouped.

[0256] Thirdly, refer to Fig.17 The utility model provides an electrical device 1000, comprising: a battery device 200 according to the above-mentioned second aspect embodiment of the utility model.

[0257] The power-consuming device 1000 may be a vehicle, and the battery device 200 may be installed at the bottom of the vehicle body 300 .

[0258] In the above technical solution, the power-consuming device 1000 includes the above-mentioned battery device 200 , which can improve the cycle performance of the battery device 200 .

[0259] Refer to the following Figure 4-Figure 14 A battery cell 100 according to various embodiments of the present invention is described.

[0260] Reference Figure 4-Figure 7In some embodiments of the present utility model, the battery cell 100 includes a flexible housing 10, a support structure 20 and an electrode assembly 30. The electrode assembly 30 and the support structure 20 are both located in the flexible housing 10, and the support structure 20 is located between the electrode assembly 30 and the flexible housing 10. The support structure 20 includes two first support plates 21 and one second support plate 22. The two first support plates 21 are located on opposite sides of the electrode assembly 30 in the thickness direction, the second support plate 22 is located on one side in the width direction of the electrode assembly 30, and the second support plate 22 is located between the two first support plates 21 and connected to both first support plates 21. The length of the first support plate 21 is the same as the length of the electrode assembly 30, and the ratio of the width of the first support plate 21 to the width of the electrode assembly 30 is greater than 1 / 2. The ratio of the length of the second support plate 22 to the length of the electrode assembly 30 is greater than 1, and the ratio of the size of the second support plate 22 in the thickness direction of the electrode assembly 30 to the thickness of the electrode assembly 30 is greater than 1.

[0261] Reference Figure 8-Figure 10 In some other embodiments of the present invention, the battery cell 100 includes a flexible housing 10, a support structure 20 and an electrode assembly 30. The electrode assembly 30 and the support structure 20 are both located in the flexible housing 10, and the support structure 20 is located between the electrode assembly 30 and the flexible housing 10. The support structure 20 includes two first support plates 21 and two second support plates 22. The two first support plates 21 are located on opposite sides of the electrode assembly 30 in the thickness direction, the two second support plates 22 are located on both sides of the electrode assembly 30 in the width direction, and the second support plate 22 is located between the two first support plates 21 and connected to both first support plates 21. The ratio of the length of the first support plate 21 to the length of the electrode assembly 30 is greater than 1, the ratio of the width of the first support plate 21 to the width of the electrode assembly 30 is greater than 1, the ratio of the length of the second support plate 22 to the length of the electrode assembly 30 is greater than 1, and the ratio of the size of the second support plate 22 in the thickness direction of the electrode assembly 30 to the thickness of the electrode assembly 30 is greater than 1.

[0262] Reference Figure 11-Figure 14In some other embodiments of the present invention, the battery cell 100 includes a flexible shell 10, a support structure 20 and an electrode assembly 30. The electrode assembly 30 and the support structure 20 are both located in the flexible shell 10, and the support structure 20 is located between the electrode assembly 30 and the flexible shell 10. The support structure 20 includes two first support plates 21, two second support plates 22 and two third support plates 23. The two first support plates 21 are located on opposite sides of the electrode assembly 30 in the thickness direction, the two second support plates 22 are located on both sides in the width direction of the electrode assembly 30, the second support plate 22 is located between the two first support plates 21 and is connected to both the first support plates 21, the two third support plates 23 are located on both sides in the length direction of the electrode assembly 30, the third support plate 23 is located between the two first support plates 21 and is connected to both the first support plates 21, the third support plate 23 is also connected to both the second support plates 22, the third support plate 23 is formed with an avoidance opening 231 for avoiding the pole ear 31, and the second support plate 22 is formed with a plurality of exhaust holes 221 arranged at intervals along the length direction of the electrode assembly 30.

[0263] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0264] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Flexible housing; an electrode assembly, wherein the electrode assembly is disposed in the flexible housing; A support structure is provided in the flexible shell and between the electrode assembly and the flexible shell. The hardness of the support structure is greater than the hardness of the flexible shell. The hardness of the support structure is HB30-HB80.

2. The battery cell according to claim 1, characterized in that: The support structure includes a metal substrate and an insulating layer, wherein the insulating layer covers a side of the metal substrate facing the electrode assembly.

3. The battery cell according to claim 2, characterized in that: The metal matrix is ​​an aluminum alloy matrix, a steel matrix or a copper matrix.

4. The battery cell according to claim 1, characterized in that: The support structure is a piece of polymer material.

5. The battery cell according to claim 4, characterized in that: The supporting structure is a polypropylene foam material piece.

6. The battery cell according to claim 1, characterized in that: The support structure includes a plurality of support plates, and the plurality of support plates are distributed on different sides of the electrode assembly.

7. The battery cell according to claim 6, characterized in that: The thickness of the support plate is 0.1 mm to 0.7 mm.

8. The battery cell according to claim 7, characterized in that: The support plate includes a metal substrate and an insulating layer, wherein the insulating layer covers a side of the metal substrate facing the electrode assembly, the metal substrate is an aluminum alloy substrate, and the thickness of the support plate is 0.5 mm to 0.7 mm.

9. The battery cell according to claim 7, characterized in that: The support plate includes a metal substrate and an insulating layer, wherein the insulating layer covers a side of the metal substrate facing the electrode assembly, the metal substrate is a steel substrate, and the thickness of the support plate is 0.2 mm to 0.4 mm.

10. The battery cell according to claim 7, characterized in that: The support plate includes a metal substrate and an insulating layer, wherein the insulating layer covers a side of the metal substrate facing the electrode assembly, the metal substrate is a copper substrate, and the thickness of the support plate is 0.4 mm to 0.6 mm.

11. The battery cell according to claim 6, characterized in that: The thickness of the support plate is greater than or equal to the thickness of the flexible shell.

12. The battery cell according to claim 6, characterized in that: The plurality of support plates include two first support plates, and the two first support plates are located at opposite sides of the electrode assembly in a thickness direction.

13. The battery cell according to claim 12, characterized in that: In the width direction of the electrode assembly, the ratio of the width of the first support plate to the width of the electrode assembly is greater than or equal to 1 / 3; and / or, in the length direction of the electrode assembly, the ratio of the length of the first support plate to the length of the electrode assembly is greater than or equal to 1 / 3.

14. The battery cell according to claim 12, characterized in that: The plurality of support plates include a second support plate connected between two of the first support plates, the second support plate being located on at least one side in the width direction of the electrode assembly, and the electrode tab of the electrode assembly being located on at least one side in the length direction of the electrode assembly.

15. The battery cell according to claim 14, characterized in that: The plurality of support plates include a third support plate connected to at least one of the second support plates, and at least one side of the third support plate in a length direction.

16. The battery cell according to claim 15, characterized in that: The avoidance opening of the third support plate.

17. The battery cell according to claim 6, characterized in that: At least a portion of the support plates are formed with exhaust holes.

18. The battery cell according to claim 17, characterized in that: The multiple support plates include a first support plate and a second support plate, there are two first support plates, the two first support plates are located on opposite sides of the electrode assembly in the thickness direction, the second support plate is connected between the two first support plates, the second support plate is located on at least one side in the width direction of the electrode assembly, and the exhaust holes are formed on the second support plates.

19. The battery cell according to claim 1, characterized in that: The flexible shell is an aluminum-plastic film; or the hardness of the flexible shell is HB16-HB22.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The support structure is fixed to the inner wall of the flexible shell or the outer wall of the electrode assembly.

21. The battery cell according to claim 20, characterized in that: The support structure is connected to the flexible housing or the electrode assembly via a structural adhesive layer.

22. The battery cell according to any one of claims 1 to 19, characterized in that: The battery cell is any one of a lithium iron phosphate battery cell, a ternary lithium battery cell and a solid-state battery cell.

23. A battery device, characterized in that: include: Box; A plurality of battery cells are disposed in the box, and the battery cells are the battery cells according to any one of claims 1-22.

24. The battery device according to claim 23, characterized in that In the thickness direction of the battery cells, a reinforcing partition is sandwiched between at least some of the adjacent battery cells, and the hardness of the reinforcing partition is greater than the hardness of the flexible shell.

25. The battery device according to claim 24, characterized in that The reinforcing partition is a metal plate.

26. The battery device according to claim 24, characterized in that The reinforcing partition is thermally connected to the flexible housing to exchange heat with the battery cell.

27. The battery device according to claim 26, characterized in that A cavity is formed in the reinforced partition plate, and at least a portion of the cavity constitutes a heat exchange flow channel for the flow of heat exchange medium.

28. The battery device according to claim 24, characterized in that At least two adjacent reinforcing partitions are connected by a connecting plate, and the connecting plate is located on one side of the battery cell along the width direction of the battery cell. The two adjacent reinforcing partitions and the corresponding connecting plate jointly define a receiving cavity for receiving the battery cell.

29. An electrical device, characterized in that: include: A battery device according to any one of claims 23 to 28.

Images