Battery monomer, battery device, energy storage device and electric equipment

Abstract

The utility model discloses a single battery, a battery device, an energy storage device and electric equipment, the single battery comprises a shell, a pole, a support frame and at least one electrode assembly, the shell comprises a shell and an end cover, an accommodating cavity is formed in the shell, an opening is formed in one end of the accommodating cavity in a first direction, and the end cover seals the opening in the first direction; the at least one electrode assembly is accommodated in the accommodating cavity and is borne on the end cover, and the electrode assembly comprises a main body part and a tab extending out from at least one side of the main body part; the pole is arranged on the end cover and is connected with the tab; the supporting frame is arranged between the end cover and the electrode assembly and comprises a supporting part and a buffering part arranged on the side, facing the main body part, of the supporting part, and the buffering part abuts against the main body part. The battery monomer, the battery device, the energy storage device and the electric equipment provided by the utility model have high capacitance.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, battery devices, energy storage devices, and electrical equipment. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] Increasing battery capacity is one of the topics that the industry needs to study. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery cell with a large capacity, a battery device, an energy storage device, and an electrical device.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery cell including a housing, a terminal post, a support frame, and at least one electrode assembly. The housing includes a casing and an end cap, with a receiving cavity formed within the casing. The receiving cavity is open at one end in a first direction, and the end cap closes the opening in the first direction. At least one electrode assembly is received within the receiving cavity and supported by the end cap. The electrode assembly includes a main body and a tab extending from at least one side of the main body. The terminal post is disposed on the end cap and connected to the tab. The support frame is disposed between the end cap and the electrode assembly, and the support frame includes a support portion and a buffer portion disposed on the side of the support portion facing the main body. The buffer portion abuts against the main body.

[0007] This embodiment of the application improves the utilization rate of the space for housing the battery cells by arranging the terminal posts of the individual battery cells downwards. This allows for the arrangement of electrical components, such as monitoring circuitry for the battery management system, above the battery cells, thus increasing the capacity within that space. Furthermore, a support frame is provided below the electrode assembly. The support portion of the frame primarily provides structural strength, improving the stability of the electrode assembly. The buffer portion of the support frame alleviates the force between the main body and the end cap, thereby reducing the vibration and impact on the electrode assembly, decreasing the likelihood of damage, and further increasing the capacity of the individual battery cells, ultimately enhancing the capacity within the given space.

[0008] In some embodiments, the buffer portion includes an elastic layer that abuts against the main body portion.

[0009] By setting an elastic layer that abuts against the main body, the elastic layer acts as a buffer when the battery cell vibrates, reducing the force between the elastic layer and the main body, and reducing the impact force of the end cap on the main body during vibration, thereby reducing the probability of damage to the electrode assembly and increasing the capacity of the battery cell.

[0010] In some embodiments, the tab includes a base connected to the side of the main body facing the end cap and a bent portion connected to the end of the base away from the main body, the bent portion being connected to the pole post, wherein the base abuts against the elastic layer.

[0011] In this embodiment, the base of the tab abuts against the elastic layer, increasing the contact area between the elastic layer and the electrode assembly, thereby improving the buffering effect of the elastic layer on the electrode assembly. Furthermore, the base protrudes from the end face of the main body, and the surface of the base facing the elastic layer is sloped. Without the elastic layer, to maintain stable contact between the main body and the support frame, an opening avoiding the base would need to be provided in the support frame, making it impossible to achieve contact between the elastic layer and the base. However, in this embodiment, the elastic layer undergoes elastic compression upon contact with the uneven base, allowing both the end faces of the base and the main body to contact the elastic layer, thus increasing the contact area between the electrode assembly and the elastic layer, and further improving the buffering effect. Additionally, the bent portion connects to the electrode post, realizing the connection between the tab and the electrode post, thereby enabling the electrode post to input or output current.

[0012] In some embodiments, the melting point of the elastic layer is lower than the melting point of the support portion.

[0013] In this way, when a single battery cell experiences thermal runaway, the elastic layer melts first, while the support portion remains unmelted. The support portion continues to support the electrode assembly. After the elastic layer melts, it can expand the pressure relief channel and improve the efficiency of pressure relief.

[0014] In some embodiments, the material of the elastic layer is at least one of ethylene-vinyl acetate copolymer, polyurethane, and polyethylene foam.

[0015] The above materials are elastic, with high resilience, high tensile strength, and high toughness. They have good vibration damping and buffering properties, thus effectively buffering the electrode assembly, reducing the impact force of the end cap on the main body, thereby reducing the probability of damage to the electrode assembly and increasing the capacity of the battery cell.

[0016] In some embodiments, the elastic modulus of the elastic layer is in the range of 220 N / mm² to 400 N / mm², and the melting point is in the range of 100 °C to 135 °C.

[0017] This application embodiment limits the elastic modulus of the elastic layer to 220 N / mm². 2 ~400N / mm 2 The range of the elastic layer ensures that it provides strong vibration buffering for the electrode assembly while preventing excessive vibration amplitude, thereby reducing the likelihood of electrode assembly damage and increasing the capacity of the battery cell.

[0018] In some embodiments, the elastic layer is a coating that is attached to the support portion by an adhesive layer.

[0019] By setting an adhesive layer between the elastic layer and the support, the elastic layer adheres more firmly to the surface of the support, thereby enabling the elastic layer to better perform its buffering function, further reducing the probability of damage to the electrode assembly, and thus increasing the capacity of the battery cell.

[0020] In some embodiments, the adhesive layer is made of at least one of the following: methyl methacrylate, butyl acrylate, ethyl acrylate, acrylic-acrylate copolymer, butadiene-styrene copolymer, styrene-acrylic acid copolymer, styrene-acrylate copolymer, ethylene-vinyl acetate copolymer, acrylic-grafted polyethylene, maleic anhydride-grafted polyethylene, acrylic-grafted polypropylene, maleic anhydride-grafted polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, polyimide, polyetherimide, polyethylene phthalate, ethylene-vinyl acetate copolymer bisphenol A type epoxy resin, ethylene-vinyl acetate copolymer bisphenol F type epoxy resin, glycerol ether type epoxy resin, glycerol ester type epoxy resin, silicone type resin, polyurethane, and styrene-isoprene-styrene copolymer.

[0021] The above adhesive materials have high bonding strength, are readily available, and are low in cost.

[0022] In some embodiments, the ratio of the thickness of the elastic layer to the thickness of the support portion is in the range of 1:3 to 1:4.

[0023] This application limits the ratio of the thickness of the elastic layer to the thickness of the support portion to a range of 1:3 to 1:4, so that the support portion can provide sufficient support for the electrode assembly, while the elastic layer can provide a suitable buffering effect.

[0024] In some embodiments, the thickness of the elastic layer is in the range of 0.15 mm to 0.3 mm.

[0025] In this way, by limiting the thickness of the elastic layer to the range of 0.15mm to 0.3mm, the thickness of the elastic layer is sufficient to provide adequate cushioning, while it will not take up too much space due to excessive thickness, thus affecting the volumetric energy density of the battery cell and thereby increasing the capacity of the battery cell.

[0026] In some embodiments, the thickness of the elastic layer is in the range of 0.18 mm to 0.25 mm.

[0027] Thus, by further limiting the thickness of the elastic layer to the range of 0.18mm to 0.25mm, the thickness of the elastic layer is sufficient to provide adequate cushioning, while avoiding excessive space occupation due to excessive thickness, which would affect the volumetric energy density of the battery cell, thereby facilitating the increase of the battery cell's capacity.

[0028] In some embodiments, the thickness of the support portion is in the range of 0.5 mm to 0.65 mm.

[0029] In this way, by limiting the thickness of the support to the range of 0.5mm to 0.65mm, the support is strong enough to provide sufficient support, but it will not take up too much space due to excessive thickness, which would affect the volumetric energy density of the battery cell, thus helping to increase the capacity of the battery cell.

[0030] In some embodiments, the material of the support portion is at least one of polypropylene and polyvinyl chloride.

[0031] The support portion made of the aforementioned materials has a high melting point, making it less likely to melt during thermal runaway of individual battery cells. It can still support the electrode assembly, maintaining its position and reducing the risk of short circuits, thus helping to suppress the progression of thermal runaway. Furthermore, the support portion made of these materials has high structural strength, providing sufficient support for the electrode assembly.

[0032] In some embodiments, the electrode assembly includes a positive electrode, an isolator, and a negative electrode stacked together. The positive electrode extends beyond the edge of the negative electrode along the first direction toward the end cap. The isolator extends beyond the edge of the positive electrode along the first direction toward the end cap. The buffer portion includes a receiving slot recessed toward the end cap. The ends of the positive electrode and the isolator that are close to the end cap along the first direction are respectively inserted into the receiving slot.

[0033] The interaction between the inner wall of the receiving slot and the portion inserted into the receiving slot reduces the vibration frequency and amplitude of the electrode assembly relative to the support frame, thereby alleviating the force between the electrode assembly and the end cap. This reduces the vibration impact force on the electrode assembly, decreases the probability of damage, and increases the capacity of the individual battery cells, further increasing the capacity within a given receiving space. Furthermore, by providing the receiving slot, the portions of the positive electrode and the separator protruding from the edge of the negative electrode are inserted into the receiving slot, allowing the edge of the negative electrode to also abut against the support frame. This increases the contact area between the main body and the support frame, facilitating the uniformization of the force between them, further reducing the probability of damage to the electrode assembly, increasing the capacity of the individual battery cells, and further increasing the capacity within a given receiving space.

[0034] In some embodiments, the tab includes a base connected to the main body and a bent portion connected to one end of the base away from the main body. The support portion forms a clearance opening. The bent portion extends from the base along a first direction to pass through the clearance opening, and after bending, extends along a second direction intersecting the first direction and connects to the pole post.

[0035] In this way, the clearance opening is used to avoid the tab, allowing the tab to pass smoothly through the support and connect to the electrode post, thus realizing the connection between the electrode assembly and the electrode post. Furthermore, the bending design of the bending part can increase the contact area with the electrode post, improve the connection strength between the two, and expand the current conduction area, which is beneficial to improving the charging and discharging efficiency.

[0036] In some embodiments, the end cap is provided with a pressure relief mechanism, and the support portion is formed with a pressure relief through hole, at least a portion of which is disposed opposite to the pressure relief mechanism along the first direction.

[0037] When a battery cell experiences thermal runaway, the gas inside the containment cavity can be discharged through the pressure relief hole and the pressure relief mechanism in sequence. Thus, the pressure relief hole is used to enable the pressure relief mechanism to release pressure in a timely manner.

[0038] In some embodiments, the end cap has an injection hole, the support has a stop surface facing the end cap and directly opposite the injection hole in the first direction, a flow channel is formed between the stop surface and the end cap, the support has a flow hole that is offset from the injection hole in the first direction, one end of the flow hole is connected to the flow channel, and the other end is connected to the receiving cavity.

[0039] The stop surface prevents the electrolyte entering through the injection hole from directly impacting the electrode assembly, greatly reducing the electrolyte flow rate and lowering the probability of damage to the electrode assembly due to electrolyte impact, thereby further improving the battery cell capacity.

[0040] In some embodiments, the support portion is provided with a first connecting structure and a second connecting structure for connecting the end cap. The first connecting structure and the second connecting structure are respectively located at opposite ends of the support portion along a third direction, which intersects the first direction. The first connecting structure and the second connecting structure are not mirror-symmetric about the mid-plane of the support portion, and the mid-plane is a plane passing through the midpoint of the support portion along the third direction and perpendicular to the third direction.

[0041] In this embodiment, the first and second connecting structures are configured to be non-mirror-symmetrical about the mid-plane of the support portion, which serves as a foolproof installation method. Furthermore, the support portion is connected to the end cap via the first and second connecting structures, fixing the support frame inside the housing, thereby allowing the support frame to effectively support and cushion the electrode assembly.

[0042] In some embodiments, the first connection structure is spaced at least two times, the second connection structure is spaced at least two times, and the spacing between adjacent first connection structures is different from the spacing between adjacent second connection structures.

[0043] In this way, by setting the spacing between adjacent first connecting structures to be different from the spacing between adjacent second connecting structures, the support frame will not be installed backwards, thus preventing mistaken installation.

[0044] In some embodiments, the end cap has an insulating member on the side facing the receiving cavity, the insulating member having a first slot and a second slot, the first connecting structure including a first buckle engaging with the first slot, and the second connecting structure including a second buckle engaging with the second slot.

[0045] In this way, the support frame and the insulating component are connected, thereby linking the support frame to the end cap. Furthermore, the connection is highly reliable and easy to install due to the engagement of the slots and buckles.

[0046] In some embodiments, at least one reinforcing rib is formed on the surface of the support portion facing the end cap.

[0047] By adding reinforcing ribs, the structural strength of the support is improved, enabling the support to provide sufficient support for the electrode assembly.

[0048] In some embodiments, at least a portion of the plurality of reinforcing ribs are arranged in a cross-shaped manner to form a mesh structure.

[0049] In this way, by forming a mesh structure through the intersecting reinforcing ribs, the structural strength of the support is further improved, enabling the support to provide sufficient support for the electrode assembly.

[0050] In some embodiments, the thickness of the reinforcing rib is in the range of 0.7 mm to 1 mm.

[0051] In this way, by limiting the thickness of the reinforcing ribs to the range of 0.7mm to 1mm, the support part can have sufficient structural strength to meet the strength requirements, while the weight of the support part will not be too large due to excessive thickness, thus facilitating the lightweighting of the battery cell.

[0052] The second aspect of this application provides a battery device, including a housing and a plurality of battery cells provided in the first aspect. The housing has a receiving space, and the battery cells are received in the receiving space with their end caps facing downwards.

[0053] Because the battery device includes individual battery cells and incorporates all the beneficial effects of those cells, it has a large electrical capacity.

[0054] A third aspect of this application provides an energy storage device comprising a plurality of battery cells provided in the first aspect or a plurality of battery devices provided in the second aspect, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0055] Because energy storage devices include individual battery cells and encompass all the beneficial effects of those cells, they have a large electrical capacity.

[0056] A fourth aspect of this application provides an electrical device comprising a plurality of battery cells provided in the first aspect or a plurality of battery devices provided in the second aspect, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0057] Because electrical equipment includes individual battery cells, and because electrical equipment includes all the beneficial effects of individual battery cells, electrical equipment has a large electrical capacity.

[0058] Utility Model Effect

[0059] This application provides a battery cell with a large capacity, a battery device, an energy storage device, and an electrical device. Attached Figure Description

[0060] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0061] Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments;

[0062] Figure 2 This is an exploded perspective view of a battery device according to one or more embodiments;

[0063] Figure 3 A three-dimensional structural schematic diagram of a battery cell according to one or more embodiments;

[0064] Figure 4 This is an exploded perspective view of a battery cell according to one or more embodiments;

[0065] Figure 5 This is an exploded view of a first structure of a support frame according to one or more embodiments;

[0066] Figure 6 for Figure 4 Enlarged view of point A in the middle;

[0067] Figure 7 This is a partial structural diagram of the bottom of an electrode assembly according to one or more embodiments;

[0068] Figure 8 This is a schematic diagram of a second structure of a support frame according to one or more embodiments;

[0069] Figure 9 This is a structural schematic diagram of the side of the support portion facing the end cap according to one or more embodiments;

[0070] Figure 10 This is a structural schematic diagram of the support portion on the side opposite to the end cap according to one or more embodiments;

[0071] Figure 11 This is a structural schematic diagram of the end cap and support frame according to one or more embodiments;

[0072] Figure 12 A cross-sectional view of the end cap of a battery cell according to one or more embodiments;

[0073] Figure 13 This is a structural schematic diagram of the side of the insulating member facing the support frame according to one or more embodiments;

[0074] Figure 14This is a flowchart of a method for manufacturing a battery cell according to one or more embodiments.

[0075] Explanation of reference numerals in the attached figures

[0076] 1000 Vehicle; 100 Battery Unit; 200 Controller; 300 Motor; 10 Housing; 101 First Housing; 102 Second Housing; 20 Battery Cell; 1 Casing; 11 End Cap; 12 Housing; 2 Electrode Assembly; 21 Tab; 21a Positive Tab; 21b Negative Tab; 211 Base; 212 Bending Part; 22 Main Body; 23 Positive Electrode; 24 Separator; 25 Negative Electrode; 3 Support Frame; 31 Support 311 Clearance opening; 312 Pressure relief through hole; 313 Stop surface; 314 Liquid flow hole; 315 First connecting structure; 315a First buckle; 316 Second connecting structure; 316a Second buckle; 317 Reinforcing rib; 32 Buffer section; 32a Elastic layer; 32b Accommodation slot; 4 Pole post; 4a Positive pole post; 4b Negative pole post; 5 Pressure relief mechanism; 6 Liquid injection hole; 7 Insulating component; 71 First slot; 72 Second slot. Detailed Implementation

[0077] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0079] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0080] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0081] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0082] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0083] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0084] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0085] The following is a detailed description of this application.

[0086] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0087] The inventors of this application have noticed that in many application scenarios, battery cells are placed with the terminals facing upwards, and components that are electrically connected to the terminals are arranged above the battery cells. In order to reduce the impact on the terminal electrical connections, it is not suitable to arrange other electrical components such as monitoring lines of the battery management system above the battery cells, which wastes the space above the battery cells, affects the utilization rate of the space that accommodates the battery cells, and causes the problem of low capacity within a certain space.

[0088] The inventors of this application discovered through research that by placing the battery cell with the terminal post facing downwards, electrical components such as monitoring circuits of the battery management system can be arranged above the battery cell, thereby improving the utilization rate of the storage space. A larger number of battery cells can be accommodated in a certain volume of storage space, thereby increasing the electrical capacity within a certain storage space.

[0089] However, the inventors of this application have also noticed that when the battery cell's terminals are placed downwards, the component supporting the electrode assembly below the battery cell is usually a lower plastic piece located inside the end cap. The contact area between the lower plastic piece and the electrode assembly is small. In addition, the weight of the electrode assembly itself is almost entirely pressed against the lower plastic piece, resulting in a large interaction force between the two. This can easily cause the electrode plates of the electrode assembly to be damaged. Furthermore, battery cells are often subject to vibration and impact during use, causing the electrode assembly to vibrate in the vertical direction. This vibration and impact can make the electrode assembly more susceptible to damage, and damage to the electrode plates can affect the battery cell's capacity.

[0090] To address this, the inventors of this application further discovered that, with the battery cell's terminals facing downwards, a support frame is provided below the electrode assembly of the battery cell. This support frame has a support portion and a buffer portion. The buffer portion abuts against the main body of the electrode assembly and is used to alleviate the force between the main body and the lower plastic layer. By providing the buffer portion, the force exerted by the lower plastic layer on the main body of the electrode assembly is reduced; that is, the force on the main body is reduced, thereby lowering the probability of damage to the electrode assembly, increasing the battery cell's capacity, and further increasing the capacity within a given space.

[0091] Based on this design concept, the inventors of this application have designed a battery cell, which includes a casing, a terminal post, a support frame, and at least one electrode assembly. The casing includes a housing and an end cap, and a receiving cavity is formed inside the housing. The receiving cavity is open at one end in a first direction, and the end cap closes the opening in the first direction. At least one electrode assembly is received in the receiving cavity and supported by the end cap. The electrode assembly includes a main body and a tab extending from at least one side of the main body. The terminal post is disposed on the end cap and connected to the tab. The support frame is disposed between the end cap and the electrode assembly. The support frame includes a support portion and a buffer portion disposed on the side of the support portion facing the main body, and the buffer portion abuts against the main body.

[0092] This design improves space utilization by arranging the battery cells with their terminals facing downwards, allowing electrical components such as monitoring circuitry for the battery management system to be placed above them. This allows for a greater number of battery cells to be accommodated within a given volume, thus increasing the overall capacity. Furthermore, a support frame is placed below the electrode assembly. The support portion of the frame provides structural strength, enhancing the stability of the electrode assembly. The buffer portion of the frame mitigates the forces between the main body and the end caps, reducing vibration and impact on the electrode assembly and minimizing the likelihood of damage. This further increases the capacity of the individual battery cells, ultimately enhancing the overall capacity within the given space.

[0093] The battery cells provided in this application embodiment can be used, but are not limited to, in battery devices. A battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0094] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0095] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0096] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0097] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0098] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0099] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0100] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0101] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0102] A single battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0103] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0104] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0105] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0106] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co The following are included: 0.25Mn0.25O2 (also known as NCM211), LiNi0.6Co0.2Mn0.2O2 (also known as NCM622), LiNi0.8Co0.1Mn0.1O2 (also known as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0107] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0108] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative current collector.

[0109] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0110] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0111] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0112] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0113] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not contain a negative electrode active material.

[0114] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0115] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0116] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0117] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0118] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0119] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0120] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0121] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0122] In some implementations, the electrode assembly is a stacked structure.

[0123] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0124] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0125] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0126] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0127] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0128] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0129] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0130] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells or battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0131] The technical solutions described in the embodiments of this application are applicable to various energy storage devices that use battery cells or battery devices, such as energy storage containers or energy storage cabinets.

[0132] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows, with reference to the accompanying drawings.

[0133] Figure 1 This is a structural schematic diagram of a vehicle 1000 according to one or more embodiments.

[0134] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc. For example... Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0135] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0136] Figure 2 This is an exploded perspective view of a battery device 100 according to one or more embodiments.

[0137] like Figure 2 As shown, the battery device 100 includes a housing 10 and at least one battery cell 20. The housing 10 has a receiving space, in which at least one battery cell 20 is received.

[0138] In some embodiments of this application, the housing 10 may include a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 are fastened together, forming an accommodating space inside the housing 10 to accommodate the battery cell 20. This accommodating space may be sealed or unsealed.

[0139] The second box 102 can be a hollow structure with one end open, and the first box 101 can be a plate-like structure. The first box 101 covers the open side of the second box 102 so that the first box 101 and the second box 102 together define the accommodating space. Alternatively, the first box 101 and the second box 102 can both be hollow structures with one side open, and the open side of the first box 101 covers the open side of the second box 102. Of course, the box 10 formed by the first box 101 and the second box 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0140] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of multiple battery cells 20 is placed in the receiving space formed by the second housing 102 and the first housing 101. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed in the receiving space formed by the second housing 102 and the first housing 101. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0141] Below, refer to Figures 3 to 14 Some embodiments of this application will be described in detail.

[0142] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These three directions intersect each other; here, intersecting each other includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, in... Figures 3 to 14 In the illustrated embodiments, the first direction, the second direction, and the third direction are given as examples where they intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. For ease of explanation, as follows... Figures 3 to 7 , Figures 9 to 11As shown by the arrows, the direction of arrow Z is the first direction, the direction of arrow X is the second direction, and the direction of arrow Y is the third direction. Sometimes, the direction that arrow Z points in along the first direction is called "above," and its opposite direction is called "below."

[0143] Figure 3 A three-dimensional structural schematic diagram of a battery cell according to one or more embodiments; Figure 4 This is an exploded perspective view of a battery cell according to one or more embodiments; Figure 5 This is an exploded view of a first structure of a support frame according to one or more embodiments; Figure 6 for Figure 4 Enlarged view of point A in the middle; Figure 7 This is a partial structural diagram of the bottom of an electrode assembly according to one or more embodiments; Figure 8 This is a schematic diagram of a second structure of a support frame according to one or more embodiments; Figure 9 This is a structural schematic diagram of the side of the support portion facing the end cap according to one or more embodiments; Figure 10 This is a structural schematic diagram of the support portion on the side opposite to the end cap according to one or more embodiments; Figure 11 This is a structural schematic diagram of the end cap and support frame according to one or more embodiments; Figure 12 A cross-sectional view of the end cap of a battery cell according to one or more embodiments; Figure 13 This is a structural schematic diagram of the side of the insulating member facing the support frame according to one or more embodiments; Figure 14 This is a flowchart of a method for manufacturing a battery cell according to one or more embodiments.

[0144] The first aspect of this application provides a battery cell 20, such as Figures 3 to 5 As shown, the battery cell 20 includes a housing 1, a terminal post 4, a support frame 3, and at least one electrode assembly 2. The housing 1 includes a shell 12 and an end cap 11. A receiving cavity is formed inside the shell 12, and the receiving cavity is open at one end in a first direction Z. The end cap 11 closes the opening in the first direction Z. At least one electrode assembly 2 is received in the receiving cavity and supported by the end cap 11. The electrode assembly 2 includes a main body 22 and a tab 21 extending from at least one side of the main body 22. The terminal post 4 is disposed on the end cap 11 and connected to the tab 21. The support frame 3 is disposed between the end cap 11 and the electrode assembly 2. The support frame 3 includes a support part 31 and a buffer part 32 disposed on the side of the support part 31 facing the main body 22. The buffer part 32 abuts against the main body 22.

[0145] Electrode assembly 2 is a component in the battery cell 20 where electrochemical reactions occur. The housing 1 may contain one or more electrode assemblies 2. Electrode assembly 2 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector. The positive active material is coated on the surface of the positive current collector; the positive current collector includes a positive current collector portion and a positive current collector protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material, and at least a portion of the positive current collector protrudes without being coated with the positive active material. The positive current collector protrudes as a positive electrode tab 21a. In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector. The negative electrode active material is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode current collection portion and a negative electrode protrusion protruding from the negative electrode current collection portion. The negative electrode current collection portion is coated with the negative electrode active material, and at least a portion of the negative electrode protrusion is not coated with the negative electrode active material. The negative electrode protrusion serves as a negative electrode tab 21b. The main body 22 of the electrode assembly 2 comprises the positive current collector of the positive current collector, the positive active material coated on the positive current collector, the negative current collector of the negative current collector, the negative active material coated on the negative current collector, and the separator. The tabs 21 include a positive tab 21a and a negative tab 21b. In the embodiments of this application, the electrode post 4 includes a positive electrode post 4a and a negative electrode post 4b. Both the positive tab 21a and the negative tab 21b extend from at least one side of the main body 22 and are respectively connected to the positive electrode post 4a and the positive electrode post 4b provided on the end cap 11, thereby realizing the input or output of current to the battery cell 20. Furthermore, the electrode assembly 2 can be a wound structure or a stacked structure.

[0146] The electrode assembly 2 is housed within the receiving cavity and supported by the end cap 11. That is, the end cap 11 is located below the electrode assembly 2 and serves to support it. The end cap 11 can be perpendicular to the direction of gravity, or it can be non-perpendicular to the direction of gravity but intersect it. Since the end cap 11 is located below the electrode assembly 2, the terminal post 4 located on the end cap 11 is positioned downwards; this downward orientation includes vertical downwards and inclined downwards. It should be noted that the orientation of the battery cell 20 when the end cap 11 supports the electrode assembly 2 is the placement orientation of the battery cell 20 in the usage scenario.

[0147] The outer casing 1 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc. In some embodiments, the outer casing 1 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 1 is a non-sealed structure, the outer casing 1 serves to protect the electrode assembly 2, and a sealing bag is also included between the outer casing 1 and the electrode assembly 2. The sealing bag is used to encapsulate the electrode assembly 2 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 1 is a sealed structure, it is used to encapsulate the electrode assembly 2 and electrolyte components.

[0148] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0149] End cap 11 is one of the wall panels of housing 1, and this wall panel is located below the receiving cavity along the first direction Z, that is, the wall panel is located below the electrode assembly 2 along the first direction Z. It is understood that housing 1 also includes other wall panels, which are connected to end cap 11 to form a receiving cavity for receiving electrode assembly 2.

[0150] In this embodiment, by arranging the terminal post 4 of the battery cell 20 downwards, electrical components such as monitoring lines of the battery management system can be arranged above the battery cell 20, improving the utilization rate of the space accommodating the battery cell 20. A larger number of battery cells 20 can be accommodated within a given volume of space, thereby increasing the capacity within that space. Furthermore, a support frame 3 is provided below the electrode assembly 2. The support portion 31 of the support frame 3 primarily provides support strength, improving the stability of the electrode assembly 2. The buffer portion 32 of the support frame 3 is used to alleviate the force between the main body 22 and the end cap 11, thereby reducing the vibration and impact force on the electrode assembly 2, reducing the probability of damage to the electrode assembly 2, increasing the capacity of the battery cell 20, and further increasing the capacity within a given space.

[0151] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the outer casing 1 includes an end cap 11 and a housing 12. The housing 12 has an opening, and the end cap 11 closes to the opening. The housing 12 may have one or more openings. The end cap 11 may also be provided with one or more.

[0152] In some embodiments of this application, such as Figure 4 and Figure 5 As shown, the buffer portion 32 includes an elastic layer 32a, which abuts against the main body portion 22.

[0153] The elastic layer 32a is an elastic layered structure. The elastic layer 32a and the main body 22 are in elastic contact. The elastic layer 32a plays a buffering role against the vibration of the main body 22.

[0154] By providing an elastic layer 32a that abuts against the main body 22, the elastic layer 32a acts as a buffer for the main body 22 when the battery cell 20 vibrates, reducing the force between the elastic layer 32a and the main body 22, reducing the impact force of the end cap 11 on the main body 22 during vibration, thereby reducing the probability of damage to the electrode assembly 2 and increasing the capacity of the battery cell 20.

[0155] In some embodiments of this application, such as Figures 4 to 6 As shown, the electrode tab 21 includes a base 211 connected to the side of the main body 22 facing the end cap 11 and a bent portion 212 connected to the end of the base 211 away from the main body 22. The bent portion 212 is connected to the electrode post 4, wherein the base 211 abuts against the elastic layer 32a.

[0156] like Figure 6 As shown, the base 211 is a trapezoidal boss structure formed by the positive electrode protrusion of the positive electrode sheet and the negative electrode protrusion of the negative electrode sheet gradually converging from the main body 22. The bent portion 212 is a sheet-like structure with uniform thickness formed after complete convergence. It can be understood that the thickness of the trapezoidal boss structure gradually decreases from the main body 22 towards the bent portion 212. It can be seen that the base 211 occupies a relatively large area in the plane perpendicular to the first direction Z. Therefore, if the elastic layer 32a does not contact the base 211, the contact area between the elastic layer 32a and the electrode assembly 2 will be greatly reduced, affecting the buffering effect of the elastic layer 32a on the electrode assembly 2.

[0157] Therefore, in this embodiment, the base 211 of the tab 21 abuts against the elastic layer 32a, increasing the contact area between the elastic layer 32a and the electrode assembly 2, thereby improving the buffering effect of the elastic layer 32a on the electrode assembly 2. In addition, the base 211 protrudes from the end face of the main body 22, and the surface of the base 211 facing the elastic layer 32a is inclined. If there is no elastic layer 32a, in order to maintain stable contact between the main body 22 and the support frame 3, an opening that avoids the base 211 needs to be provided in the support frame 3, making it impossible to achieve contact between the elastic layer 32a and the base 211. However, in this embodiment, the elastic layer 32a is provided. Since the elastic layer 32a will undergo elastic compression when it comes into contact with the uneven base 211, both the end faces of the base 211 and the main body 22 can contact the elastic layer 32a, thereby increasing the contact area between the electrode assembly 2 and the elastic layer 32a, and thus improving the buffering effect. In addition, the bent part 212 is connected to the pole post 4, realizing the connection between the tab 21 and the pole post 4, thereby enabling the pole post 4 to input or output current.

[0158] In some embodiments of this application, the melting point of the elastic layer 32a is lower than that of the support portion 31.

[0159] Thus, when thermal runaway occurs in the battery cell 20, the elastic layer 32a will melt first, while the support portion 31 will not melt. The support portion 31 will continue to support the electrode assembly 2. After the elastic layer 32a melts, it can expand the pressure relief channel and promote the pressure relief efficiency.

[0160] In some embodiments of this application, the material of the elastic layer 32a is at least one of ethylene-vinyl acetate copolymer, polyurethane, and polyethylene foam.

[0161] The above materials are elastic, with high resilience, high tensile strength, and high toughness, and have good vibration reduction and buffering performance, thus effectively buffering the electrode assembly 2, reducing the impact force of the end cap 11 on the main body 22, thereby reducing the probability of damage to the electrode assembly 2, and increasing the capacity of the battery cell 20.

[0162] In some embodiments of this application, the elastic modulus of the elastic layer 32a is 220 N / mm². 2 ~400N / mm 2 The melting point is in the range of 100℃ to 135℃.

[0163] For example, the elastic modulus of the elastic layer 32a may be, but is not limited to, 220 N / mm². 2 230N / mm 2 240N / mm 2 250N / mm 2 260N / mm 2 270N / mm 2 280N / mm 2 290N / mm 2 300N / mm 2 310N / mm 2 320N / mm 2 330N / mm 2 340N / mm 2 350N / mm 2 360N / mm 2 370N / mm 2 380N / mm 2 390N / mm 2 400N / mm 2For example, the melting point of the elastic layer 32a may be, but is not limited to, 100℃, 101℃, 102℃, 103℃, 104℃, 105℃, 106℃, 107℃, 108℃, 109℃, 110℃, 111℃, 112℃, 113℃, 114℃, 115℃, 116℃, 117℃, 118℃, 119℃, 120℃, 121℃, 122℃, 123℃, 124℃, 125℃, 126℃, 127℃, 128℃, 129℃, 130℃, 131℃, 132℃, 133℃, 134℃, and 135℃.

[0164] The higher the elastic modulus of the elastic layer 32a, the weaker its vibration buffering effect on the electrode assembly 2, and the smaller the vibration amplitude of the electrode assembly 2. Conversely, the lower the elastic modulus, the stronger its vibration buffering effect on the electrode assembly 2, and the larger the vibration amplitude of the electrode assembly 2. Therefore, in this embodiment, the elastic modulus of the elastic layer 32a is limited to 220 N / mm². 2 ~400N / mm 2 The range of elastic layer 32a provides strong vibration buffering for electrode assembly 2 while preventing excessive vibration amplitude, thereby reducing the probability of damage to electrode assembly 2 and increasing the capacity of battery cell 20.

[0165] In some embodiments of this application, the elastic layer 32a is bonded to the surface of the back end cap 11 of the support portion 31 by an adhesive layer.

[0166] In some embodiments of this application, the elastic layer 32a is a coating that is attached to the support portion 31 by an adhesive layer.

[0167] The adhesive layer can be made of, but is not limited to, acrylic adhesives.

[0168] The elastic layer 32a is a coating applied to the surface of the support portion 31. It can be formed by brushing, spraying, or roller coating, etc., and is not specifically limited here.

[0169] By providing an adhesive layer between the elastic layer 32a and the support portion 31, the elastic layer 32a is more firmly attached to the surface of the support portion 31, thereby enabling the elastic layer 32a to better perform its buffering function, further reducing the probability of damage to the electrode assembly 2, and thus increasing the capacity of the battery cell 20.

[0170] In some embodiments of this application, the adhesive layer material is at least one selected from methyl methacrylate, butyl acrylate, ethyl acrylate, acrylic-acrylate copolymer, butadiene-styrene copolymer, styrene-acrylic copolymer, styrene-acrylate copolymer, ethylene-vinyl acetate copolymer, acrylic-grafted polyethylene, maleic anhydride-grafted polyethylene, acrylic-grafted polypropylene, maleic anhydride-grafted polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, polyimide, polyetherimide, polyethylene phthalate, ethylene-vinyl acetate copolymer bisphenol A type epoxy resin, ethylene-vinyl acetate copolymer bisphenol F type epoxy resin, glycerol ether type epoxy resin, glycerol ester type epoxy resin, silicone type resin, polyurethane, and styrene-isoprene-styrene copolymer.

[0171] The above adhesive materials have high bonding strength, are readily available, and are low in cost.

[0172] In some embodiments of this application, the ratio of the thickness of the elastic layer 32a to the thickness of the support portion 31 is in the range of 1:3 to 1:4.

[0173] For example, the elastic layer 32a is a layered structure that is uniformly attached to the support portion 31, that is, the thickness of the elastic layer 32a is uniform.

[0174] like Figure 5 As shown, the thickness of the support portion 31 is Figure 5 The thickness L is shown in the diagram. In this application, the ratio of the thickness of the elastic layer 32a to the thickness L of the support portion 31 is limited to the range of 1:3 to 1:4, so that the support portion 31 can provide sufficient support for the electrode assembly 2, and the elastic layer 32a can provide a suitable buffering effect.

[0175] In some embodiments of this application, the thickness of the elastic layer 32a is in the range of 0.15 mm to 0.3 mm.

[0176] For example, the thickness of the elastic layer 32a can be, but is not limited to, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, or 0.3mm.

[0177] In this way, by limiting the thickness of the elastic layer 32a to the range of 0.15mm to 0.3mm, the thickness of the elastic layer 32a is sufficient to provide adequate buffering, while not being too thick and taking up too much space, which would affect the volumetric energy density of the battery cell 20, thereby increasing the capacity of the battery cell 20.

[0178] In some embodiments of this application, the thickness of the elastic layer 32a is in the range of 0.18 mm to 0.25 mm.

[0179] For example, the thickness of the elastic layer 32a can be, but is not limited to, 0.18mm, 0.185mm, 0.19mm, 0.195mm, 0.2mm, 0.205mm, 0.21mm, 0.215mm, 0.22mm, 0.225mm, 0.23mm, 0.235mm, 0.24mm, 0.245mm, and 0.25mm.

[0180] Thus, by further limiting the thickness of the elastic layer 32a to the range of 0.18mm to 0.25mm, the thickness of the elastic layer 32a is sufficient to provide adequate buffering, while not being too thick and occupying too much space, which would affect the volumetric energy density of the battery cell 20, thereby increasing the capacity of the battery cell 20.

[0181] In some embodiments of this application, such as Figure 5 As shown, the thickness L of the support portion 31 is in the range of 0.5mm to 0.65mm.

[0182] For example, such as Figure 5 As shown, the thickness L of the support portion 31 can be, but is not limited to, 0.5mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm, 0.61mm, 0.62mm, 0.63mm, 0.64mm, and 0.65mm.

[0183] In this way, by limiting the thickness L of the support portion 31 to the range of 0.5mm to 0.65mm, the support portion 31 is strong enough to provide sufficient support, and will not be too thick and occupy too much space, thus affecting the volumetric energy density of the battery cell 20, thereby increasing the capacity of the battery cell 20.

[0184] In some embodiments of this application, the material of the support portion 31 is at least one of polypropylene and polyvinyl chloride.

[0185] The support portion 31, made of the aforementioned material, has a high melting point, making it less likely to melt during thermal runaway of the battery cell 20. It can still support the electrode assembly 2, maintaining its position and reducing the risk of short circuits, thus helping to suppress the progression of thermal runaway. Furthermore, the support portion 31, made of the aforementioned material, has high structural strength, providing sufficient support for the electrode assembly 2.

[0186] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, the electrode assembly 2 includes a positive electrode 23, an insulating member 24, and a negative electrode 25 stacked together. The positive electrode 23 extends beyond the edge of the negative electrode 25 along the first direction Z toward the end cap 11. The insulating member 24 extends beyond the edge of the positive electrode 23 along the first direction Z toward the end cap 11. The buffer portion 32 includes a receiving slot 32b recessed toward the end cap 11. The ends of the positive electrode 23 and the insulating member 24 that are close to the end cap 11 along the first direction Z are respectively inserted into the receiving slot 32b.

[0187] For example, the buffer portion 32 is a receiving slot 32b formed on the surface of the opposite end cap 11 of the support portion 31.

[0188] For example, the buffer portion 32 includes an elastic layer 32a, and the surface of the back end cap 11 of the elastic layer 32a is formed with a receiving slot 32b.

[0189] The positive electrode 23 extends beyond the edge of the negative electrode 25 along the first direction Z toward the end cap 11, and the separator 24 extends beyond the edge of the positive electrode 23 along the first direction Z toward the end cap 11. That is, the end of the main body 22 facing the end cap 11 is not flat, and both the positive electrode 23 and the separator 24 protrude beyond the edge of the negative electrode 25. By providing a receiving slot 32b in the buffer portion 32, the portions of the positive electrode 23 and the separator 24 that protrude beyond the edge of the negative electrode 25 are inserted into the receiving slot 32b. Due to the interaction between the inner wall of the receiving slot 32b and the portion inserted into the receiving slot 32b, the vibration frequency and vibration amplitude of the electrode assembly 2 relative to the support frame 3 can be reduced, thereby alleviating the force between the electrode assembly 2 and the end cap 11, thereby reducing the vibration impact force on the electrode assembly 2, reducing the probability of damage to the electrode assembly 2, increasing the capacity of the battery cell 20, and further increasing the capacity within a certain receiving space. In addition, by setting the receiving slit 32b, the positive electrode plate 23 and the separator 24 protruding from the edge of the negative electrode plate 25 are inserted into the receiving slit 32b, so that the edge of the negative electrode plate 25 can also abut against the support frame 3, increasing the contact area between the main body 22 and the support frame 3, which helps to even out the force between the main body 22 and the support frame 3, thereby reducing the probability of the electrode assembly 2 being damaged, increasing the capacity of the battery cell 20, and further increasing the capacity within a certain receiving space.

[0190] In some embodiments of this application, such as Figure 4 , Figure 6 and Figure 9As shown, the electrode 21 includes a base 211 connected to the main body 22 and a bent portion 212 connected to the end of the base 211 away from the main body 22. The support portion 31 has a clearance opening 311. The bent portion 212 extends from the base 211 along the first direction Z to pass through the clearance opening 311, and after bending, extends along the second direction X intersecting the first direction Z and connects to the electrode post 4.

[0191] For example, such as Figure 6 As shown, the tab 21 is formed at one end edge of the main body 22 near the second direction X, as... Figure 9 As shown, the clearance opening 311 is a notch formed on one end edge of the support portion 31 along the second direction X. The bent portion 212 of the electrode tab 21 extends from the base 211 along the first direction Z to pass through the clearance opening 311, and after bending, extends along the second direction X and connects to the electrode post 4.

[0192] Thus, the clearance opening 311 is used to avoid the tab 21, allowing the tab 21 to pass smoothly through the support portion 31 and connect to the electrode post 4, thereby achieving the connection between the electrode assembly 2 and the electrode post 4. Furthermore, the bending portion 212 is bent to increase the contact area with the electrode post 4, improve the connection strength between the two, and expand the current conduction area, which is beneficial to improving the charging and discharging efficiency.

[0193] In some embodiments of this application, such as Figures 9 to 11 As shown, the end cap 11 is provided with a pressure relief mechanism 5, and the support part 31 is formed with a pressure relief through hole 312. At least a portion of the pressure relief through hole 312 is arranged opposite to the pressure relief mechanism 5 along the first direction Z.

[0194] For example, such as Figure 10 As shown, the pressure relief through-hole 312 is a through-hole that penetrates the support portion 31 along the first direction Z. The shape of the pressure relief through-hole 312 can be, but is not limited to, a circle, an ellipse, a triangle, a quadrilateral, or other polygons. The size of the pressure relief through-hole 312 can be limited according to the size of the pressure relief mechanism 5, and is not specifically limited here. For example, the size of the pressure relief through-hole 312 provided at the center of the support portion 31 corresponding to the pressure relief mechanism 5 is relatively large, while the size of the pressure relief through-hole 312 provided near the edge of the pressure relief mechanism 5 is relatively small. In this way, gas can be discharged smoothly, and the structural strength of the support portion 31 can meet the requirements.

[0195] When thermal runaway occurs in the battery cell 20, the gas in the containment cavity can be discharged through the pressure relief hole 312 and the pressure relief mechanism 5 in sequence. Thus, the pressure relief hole 312 is used to enable the pressure relief mechanism 5 to release pressure in a timely manner.

[0196] In some embodiments of this application, such as Figure 11 and Figure 12As shown, the end cap 11 has an injection hole 6, and the support part 31 has a stop surface 313 facing the end cap 11 and directly opposite the injection hole 6 in the first direction Z. A flow channel is formed between the stop surface 313 and the end cap 11. The support part 31 has a flow hole 314 that is offset from the injection hole 6 in the first direction Z. One end of the flow hole 314 is open and connected to the flow channel, and the other end is connected to the receiving cavity.

[0197] The outflow hole 314 and the injection hole 6 are misaligned in the first direction Z, meaning that when viewed along the first direction Z, the outflow hole 314 and the injection hole 6 are not directly opposite each other and there is no overlap between them. Therefore, the electrolyte entering from the injection hole 6 will first impact the stop surface 313, and then flow along the stop surface 313 to the outflow hole 314. During this process, the electrolyte will change direction and the flow rate of the electrolyte will decrease. Afterward, the speed at which the electrolyte enters the receiving cavity through the outflow hole 314 is relatively small, thereby reducing the impact force on the electrode assembly 2.

[0198] For example, such as Figure 11 and Figure 12 As shown, the stop surface 313 is provided with flow holes 314 on both sides along the second direction X. In this way, the electrolyte entering from the injection hole 6 will be divided into two flow paths after impacting the stop surface 313, and will enter the receiving cavity through the two flow paths respectively.

[0199] It is understandable that, such as Figures 3 to 7 The indicated orientation shows the placement of the battery cell 20 in its application state, where both the electrolyte filling hole 6 and the terminal post 4 of the battery cell 20 face downwards. Figure 11 and Figure 12 The indicated orientation is the placement of the battery cell 20 during the liquid injection process, at which point both the liquid injection hole 6 and the electrode post 4 are facing upwards. Figure 12 The middle arrow indicates the flow path of the electrolyte during the injection process. During injection, the electrolyte is injected downward through the injection hole 6. Since the stop surface 313 and the injection hole 6 are directly opposite each other in the first direction Z, the electrolyte will directly impact the stop surface 313. Then, the electrolyte will flow along the flow channel formed between the stop surface 313 and the end cap 11 to the flow hole 314 and enter the receiving cavity through the flow hole 314. In this way, the electrolyte is smoothly injected into the receiving cavity. Furthermore, due to the obstruction of the stop surface 313, the electrolyte entering from the injection hole 6 will not directly impact the electrode assembly 2, which greatly reduces the flow velocity of the electrolyte and reduces the probability of damage to the electrode assembly 2 due to the impact of the electrolyte, thereby further improving the capacity of the battery cell 20.

[0200] In some embodiments of this application, such as Figure 12As shown, the end cap 11 has an insulating member 7 on the side facing the electrode assembly 2. The support part 31 has a stop surface 313 facing the end cap 11 and directly opposite the injection hole 6 in the first direction Z. A flow channel is formed between the stop surface 313 and the insulating member 7. The support part 31 has a flow hole 314 that is offset from the injection hole 6 in the first direction Z. One end of the flow hole 314 is open and connected to the flow channel, and the other end is connected to the receiving cavity.

[0201] An insulating element 7 is disposed on the inner surface of the end cap 11 to isolate the electrical connection components inside the housing 1 from the end cap 11, thereby reducing the risk of short circuit. For example, the insulating element 7 may be made of plastic, rubber, etc.

[0202] In some embodiments of this application, such as Figure 11 As shown, the support portion 31 is provided with a first connecting structure 315 and a second connecting structure 316 for connecting the end cap 11. The first connecting structure 315 and the second connecting structure 316 are respectively provided at opposite ends of the support portion 31 along the third direction Y. The third direction Y intersects with the first direction Z. The first connecting structure 315 and the second connecting structure 316 are not mirror-symmetric about the mid-plane of the support portion 31. The mid-plane is a plane that passes through the midpoint of the support portion 31 along the third direction Y and is perpendicular to the third direction Y.

[0203] The first connecting structure 315 and the second connecting structure 316 are not mirror-symmetric about the mid-plane of the support portion 31. This can be due to the asymmetrical positions of the first connecting structure 315 and the second connecting structure 316, or the asymmetrical structures of the first connecting structure 315 and the second connecting structure 316.

[0204] If the first connecting structure 315 and the second connecting structure 316 are mirror-symmetrical about the mid-plane of the support portion 31, the support frame 3 is prone to being installed backwards during installation. Therefore, in this embodiment, the first connecting structure 315 and the second connecting structure 316 are non-mirror-symmetrical about the mid-plane of the support portion 31, which serves to prevent mistaken installation. In addition, the support portion 31 is connected to the end cap 11 through the first connecting structure 315 and the second connecting structure 316, so that the support frame 3 is fixed inside the outer shell 1, thereby allowing the support frame 3 to effectively support and buffer the electrode assembly 2.

[0205] In some embodiments of this application, such as Figure 10 and Figure 11 As shown, at least two first connecting structures 315 are spaced apart, and at least two second connecting structures 316 are spaced apart. The spacing between adjacent first connecting structures 315 is different from the spacing between adjacent second connecting structures 316.

[0206] For example, such as Figure 10As shown, two first connecting structures 315 are spaced apart along the second direction X, and two second connecting structures 316 are spaced apart along the second direction X. The spacing H2 between the two first connecting structures 315 and the spacing H1 between the two second connecting structures 316 are different, so as to prevent mistakes when installing the support frame 3.

[0207] Thus, by setting the spacing between adjacent first connecting structures 315 and the spacing between adjacent second connecting structures 316 to be different, the support frame 3 will not be installed backwards, thus preventing mistaken installation.

[0208] In some embodiments of this application, such as Figure 11 and Figure 13 As shown, the end cap 11 has an insulating member 7 on the side facing the receiving cavity. The insulating member 7 forms a first slot 71 and a second slot 72. The first connecting structure 315 includes a first buckle 315a that engages with the first slot 71, and the second connecting structure 316 includes a second buckle 316a that engages with the second slot 72.

[0209] In this way, the support frame 3 and the insulating component 7 are connected, thereby connecting the support frame 3 to the end cap 11. Furthermore, the connection is highly reliable and easy to install due to the engagement of the slots and buckles.

[0210] In some embodiments of this application, such as Figure 11 As shown, at least one reinforcing rib 317 is formed on the surface of the support portion 31 facing the end cap 11.

[0211] It is understood that the support portion 31 is formed with reinforcing ribs 317, that is, the reinforcing ribs 317 are part of the support portion 31, in other words, the support portion 31 includes the reinforcing ribs 317. For example, the support portion 31 is a one-piece molded structure.

[0212] By setting the reinforcing ribs 317, the structural strength of the support part 31 is improved, enabling the support part 31 to provide sufficient support for the electrode assembly 2.

[0213] In some embodiments of this application, at least a portion of a plurality of reinforcing ribs 317 are arranged in a cross-shaped manner to form a mesh structure.

[0214] Thus, by forming a mesh structure through the interlacing of the reinforcing ribs 317, the structural strength of the support portion 31 is further improved, enabling the support portion 31 to provide sufficient support for the electrode assembly 2.

[0215] In some embodiments of this application, the thickness of the reinforcing rib 317 is in the range of 0.7 mm to 1 mm.

[0216] For example, the thickness of the reinforcing rib 317 can be, but is not limited to, 0.7mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.8mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.88mm, 0.89mm, 0.9mm, 0.91mm, 0.92mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, and 1mm.

[0217] Thus, by limiting the thickness of the reinforcing rib 317 to the range of 0.7mm to 1mm, the support part 31 can have sufficient structural strength to meet the strength requirements, while the support part 31 will not be too heavy due to excessive thickness, thereby facilitating the lightweighting of the battery cell 20.

[0218] It should be noted that, as Figure 5 As shown, the buffer part 32 is provided on the surface of the support part 31 facing away from the end cap 11. That is, the buffer part 32 also forms a clearance notch at the position of the clearance opening 311 of the support part 31, so that the bent part 212 of the electrode tab 21 can pass through the support frame 3 and extend to the electrode post 4. The buffer part 32 also forms a through hole at the position of the pressure relief through hole 312 of the support part 31, so that the gas and liquid in the receiving cavity can enter the pressure relief through hole 312 and enter the pressure relief mechanism 5 through the pressure relief through hole 312, thereby realizing pressure relief. The buffer part 32 also forms a notch at the position of the liquid flow hole 314 of the support part 31, so that the electrolyte entering from the liquid injection hole 6 can enter the receiving cavity of the outer shell 1 through the liquid flow hole 314, thereby realizing liquid injection.

[0219] The second aspect of this application provides a battery device 100, which includes a housing 10 and a plurality of battery cells 20 provided in the first aspect. The housing 10 has a receiving space, and the battery cells 20 are received in the receiving space with their end caps 11 facing downwards.

[0220] "End cap 11 facing down" means that the outer surface of the end cap 11 facing away from the receiving cavity is set downwards. This can be that the outer surface of the end cap 11 faces the lower side in the direction of gravity, or it can face the obliquely downwards relative to the direction of gravity.

[0221] The battery device 100 can be a battery pack, which includes a housing 10 and a plurality of battery cells 20, with the battery cells 20 housed in the housing 10.

[0222] Since the battery device 100 includes a battery cell 20 and has all the beneficial effects of the battery cell 20, the battery device 100 has a large electrical capacity.

[0223] A third aspect of this application provides an energy storage device, which includes a plurality of battery cells 20 provided in the first aspect or a plurality of battery devices 100 provided in the second aspect, wherein the battery cells 20 or battery devices 100 are used to store or provide electrical energy.

[0224] Since the energy storage device includes battery cells 20 and has all the beneficial effects of battery cells 20, the energy storage device has a large capacity.

[0225] The fourth aspect of this application provides an electrical device that includes a plurality of battery cells 20 provided in the first aspect or a plurality of battery devices 100 provided in the second aspect, wherein the battery cells 20 or battery devices 100 are used to store or provide electrical energy.

[0226] Because the electrical equipment includes a battery cell 20, and because the electrical equipment includes all the beneficial effects of the battery cell 20, the electrical equipment has a large electrical capacity.

[0227] The fifth aspect of this application provides a method for manufacturing a single battery cell, such as... Figure 14 As shown, the manufacturing method includes:

[0228] S1 provides a housing, electrode post, support frame, and at least one electrode assembly.

[0229] The outer casing 1 has a receiving cavity and an end cap 11 disposed on one side of the receiving cavity along the first direction Z;

[0230] S2, Install the electrode assembly into the receiving cavity;

[0231] S3, connect the support frame to the side of the end cap facing the electrode assembly;

[0232] S4, connect the electrode post to the end cap and to the tab of the electrode assembly.

[0233] The electrode assembly 2 is supported on the end cap 11. The electrode assembly 2 includes a main body 22 and an electrode tab 21 extending from the side of the main body 22 facing the end cap 11. The support frame 3 includes a support 31 and a buffer 32 provided on the side of the support 31 facing the main body 22. The buffer 32 abuts against the main body 22 and can relieve the force between the main body 22 and the end cap 11.

[0234] When the battery cell 20 manufactured by the above method is used with the terminal post 4 facing downwards, electrical components such as monitoring lines of the battery management system can be arranged above the battery cell 20, improving the utilization rate of the space accommodating the battery cell 20. A larger number of battery cells 20 can be accommodated within a given volume of space, thereby increasing the capacity within that space. Furthermore, a support frame 3 is provided below the electrode assembly 2. The support portion 31 of the support frame 3 mainly provides support strength, improving the stability of the electrode assembly 2. The buffer portion 32 of the support frame 3 is used to alleviate the force between the main body 22 and the end cap 11, thereby reducing the vibration and impact force on the electrode assembly 2, reducing the probability of damage to the electrode assembly 2, increasing the capacity of the battery cell 20, and further increasing the capacity within a given space.

[0235] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0236] As a specific example, a battery cell is provided, which includes a housing (housing 1) and at least one bare cell (electrode assembly 2) disposed within the housing. The housing includes a shell (housing 12) and an end cap (end cap 11). The shell (housing 12) has an opening, and the end cap (end cap 11) covers the opening to form a receiving cavity for accommodating the bare cell. The end cap is located below the bare cell, and a support (support 31) is provided between the end cap and the bare cell. The surface of the support facing away from the end cap (end cap 11) is coated with an EVA (ethylene-vinyl acetate copolymer) elastic coating (elastic layer 32a). The EVA elastic coating reduces the hard compression between the support and the bare cell, and provides a buffering effect on the bare cell through elastic deformation, thereby reducing impact damage to the bare cell.

[0237] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. A battery cell, characterized by, The application relates to a battery, which comprises: a housing including a casing and an end cover, the casing being internally formed with a receiving cavity which is open at one end in a first direction, and the end cover closing the opening in the first direction; at least one electrode assembly accommodated in the receiving cavity and carried on the end cover, the electrode assembly including a main body and a tab extending from at least one side of the main body; a post provided on the end cover and connected with the tab; a support frame provided between the end cover and the electrode assembly, the support frame including a support portion and a buffer portion provided on one side of the support portion facing the main body, and the buffer portion being in abutment with the main body.

2. The battery cell of claim 1, wherein, The buffer portion includes an elastic layer in abutment with the main body.

3. The battery cell of claim 2, wherein, The tab includes a base connected to one side of the main body facing the end cover and a bent portion connected to one end of the base away from the main body, and the bent portion is connected to the post, wherein the base is in abutment with the elastic layer.

4. The battery cell according to claim 2 or 3, characterized in that, The melting point of the elastic layer is lower than that of the support portion.

5. The battery cell according to any one of claims 2 to 4, characterized in that, The material of the elastic layer is at least one of ethylene-vinyl acetate copolymer, polyurethane and polyethylene foam.

6. The battery cell according to any one of claims 2 to 5, characterized in that, The elastic modulus of the elastic layer is in the range of 220 N / mm 2 ~ 400 N / mm 2 and the melting point is in the range of 100°C ~ 135°C.

7. The battery cell according to any one of claims 2 to 6, characterized in that, The elastic layer is a coating layer attached to the support portion through an adhesive layer.

8. The battery cell of claim 7, wherein, The material of the adhesive layer is at least one of methyl methacrylate, butyl acrylate, ethyl acrylate, acrylic acid-acrylate copolymer, butadiene-styrene copolymer, styrene-acrylic acid copolymer, styrene-acrylate copolymer, ethylene-vinyl acetate copolymer, acrylic acid grafted polyethylene, maleic anhydride grafted polyethylene, acrylic acid grafted polypropylene, maleic anhydride grafted polypropylene, polyvinylidene fluoride, carboxymethyl cellulose, polyimide, polyetherimide, polyethylene terephthalate, ethylene-vinyl acetate copolymer bisphenol A type epoxy resin, ethylene-vinyl acetate copolymer bisphenol F type epoxy resin, glycerol ether type epoxy resin, glycerol ester type epoxy resin, silicone type resin, polyurethane and styrene-isoprene-styrene copolymer.

9. The battery cell according to any one of claims 2 to 8, characterized in that, The ratio of the thickness of the elastic layer to the thickness of the support portion is in the range of 1:3 to 1:

4.

10. The battery cell according to any one of claims 2 to 9, characterized in that, The thickness of the elastic layer is in the range of 0.15 mm to 0.3 mm.

11. The battery cell of any one of claims 2 to 9, wherein, The thickness of the elastic layer is in the range of 0.18 mm to 0.25 mm.

12. The battery cell of any one of claims 2 to 9, wherein, The thickness of the support portion is in the range of 0.5 mm to 0.65 mm.

13. The battery cell of any one of claims 1 to 12, wherein, The material of the support portion is at least one of polypropylene and polyvinyl chloride.

14. The battery cell of any one of claims 1 to 13, wherein, The electrode assembly includes a positive electrode sheet, a separator and a negative electrode sheet arranged in layers, the positive electrode sheet exceeding the edge of the negative electrode sheet in the first direction towards the end cover, and the separator exceeding the edge of the positive electrode sheet in the first direction towards the end cover, The buffer portion includes a receiving slot recessed towards the end cover, and one end of the positive electrode sheet and the separator in the first direction close to the end cover is respectively inserted into the receiving slot.

15. The battery cell of any one of claims 1 to 14, wherein, The tab includes a base connected to the main body and a bent portion connected to one end of the base away from the main body, The support portion is formed with an avoiding opening, the bending portion extends along the first direction to pass through the avoiding opening from the base portion, and extends along a second direction intersecting the first direction after bending and connects the pole.

16. The battery cell of any one of claims 1 to 15, wherein, The end cover is provided with a pressure relief mechanism, The support portion is formed with a pressure relief through hole, at least part of the pressure relief through hole is arranged opposite to the pressure relief mechanism along the first direction.

17. The battery cell of any one of claims 1 to 16, wherein, The end cover is formed with a liquid injection hole, The support portion has a stop surface facing the end cover and opposite to the liquid injection hole along the first direction, a flow channel is formed between the stop surface and the end cover, the support portion is formed with a flow liquid hole staggered with the liquid injection hole along the first direction, one end of the flow liquid hole is open and communicates with the flow channel, and the other end communicates with the accommodating cavity.

18. The battery cell of any one of claims 1-17, wherein, The support portion is provided with a first connecting structure and a second connecting structure for connecting the end cover, the first connecting structure and the second connecting structure are respectively arranged at opposite ends of the support portion along a third direction, and the third direction intersects the first direction, The first connecting structure and the second connecting structure are not mirror-symmetric about a mid-plane of the support portion, and the mid-plane is a plane passing through a midpoint of the support portion along the third direction and perpendicular to the third direction.

19. The battery cell of claim 18, wherein, The first connecting structure is spaced apart by at least two, the second connecting structure is spaced apart by at least two, and the spacing between adjacent first connecting structures is different from the spacing between adjacent second connecting structures.

20. The battery cell of claim 18 or 19, wherein, The side of the end cover facing the accommodating cavity is provided with an insulating member, the insulating member is formed with a first clamping groove and a second clamping groove, The first connecting structure includes a first buckle clamped with the first clamping groove, and the second connecting structure includes a second buckle clamped with the second clamping groove.

21. The battery cell of any one of claims 1-20, wherein, The surface of the support portion facing the end cover is formed with at least one reinforcing rib.

22. The battery cell of claim 21, wherein, At least part of the plurality of reinforcing ribs is arranged in a cross shape to form a mesh structure.

23. The battery cell of claim 22, wherein, The thickness of the reinforcing rib is in the range of 0.7mm to 1mm.

24. A battery device, characterized by Comprising: A box body, the box body is provided with an accommodating space; A plurality of battery monomers as claimed in any one of claims 1 to 23, the battery monomers are accommodated in the accommodating space with the end cover facing downward.

25. An energy storage device, comprising: A plurality of battery monomers as claimed in any one of claims 1 to 23 or a plurality of battery devices as claimed in claim 24 are used to store or provide electric energy.

26. An electrical device, comprising: A plurality of battery monomers as claimed in any one of claims 1 to 23 or a plurality of battery devices as claimed in claim 24 are used to store or provide electric energy.

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