Battery monomer, battery, power utilization device and energy storage device

Abstract

The utility model discloses a battery monomer, a battery, a power utilization device and an energy storage device. The battery cell includes a case assembly, an electrode assembly, and a connection member. An accommodating space is formed in the shell assembly, and an electrode terminal is formed on the shell assembly. The electrode assembly is located in the accommodating space. The connecting part is used for connecting the electrode assembly and the electrode terminal, the connecting part is provided with a first surface and a second surface which are located on the two opposite sides in the thickness direction of the connecting part, the connecting part comprises a body and a protruding structure, the protruding structure is arranged on the body, and the protruding structure comprises a protruding part formed on the first surface side and a concave part formed on the second surface side. The protruding structure comprises an end wall and a side wall, and the side wall is connected between the end wall and the body. The included angle between the side wall and the body ranges from 90 degrees to 180 degrees, and the thickness of the side wall ranges from 0.1 mm to 3 mm. When the connecting parts of the battery monomer are stacked together, the connecting parts are not easy to be clamped with each other, so that the assembly efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, batteries, electrical devices and energy storage devices. Background Art

[0002] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0003] During the assembly and manufacturing process of battery cells, connecting components are required to connect the electrode assembly in the shell assembly with the electrode terminals on the shell assembly so that the electrical energy of the electrode assembly can be extracted through the electrode terminals. When the clamping device clamps the connecting components from the material collection area, the material may get stuck, affecting the assembly efficiency. Therefore, how to reduce the possibility of material jamming of the connecting components to improve assembly efficiency is one of the research topics in the industry. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell, a battery, an electrical device and an energy storage device with high assembly efficiency.

[0005] This application is implemented through the following technical solutions.

[0006] The first aspect of the present application provides a battery cell, which includes: a shell assembly, which has a accommodating space formed inside and an electrode terminal formed on the shell assembly; an electrode assembly, which is located in the accommodating space; and a connecting component for connecting the electrode assembly and the electrode terminal, the connecting component having a first surface and a second surface located on opposite sides along its thickness direction, the connecting component including: a body and a protruding structure, the protruding structure is arranged on the body, the protruding structure includes a convex portion formed on the first surface side and a concave portion formed on the second surface side, the protruding structure includes an end wall and a side wall, the side wall is connected between the end wall and the body; wherein the angle between the side wall and the body is in the range of 90° to 180°, and the thickness of the side wall is in the range of 0.1 mm to 3 mm.

[0007] When the connecting components are stacked, the raised structures of each connecting component correspond to each other. Therefore, the angle between the side wall of the raised structure and the main body and the thickness of the side wall of the raised structure can be within an appropriate range, so that the raised structure has better ability to resist deformation, and the contact area between the raised structures of two adjacent connecting components is smaller when the connecting components are stacked, thereby effectively reducing friction and further reducing the possibility of the stacked connecting components getting stuck to each other during loading, that is, reducing the possibility of the connecting components getting stuck, which is more conducive to material removal during the battery cell production process, improves assembly efficiency, and is more conducive to automated assembly.

[0008] In some embodiments, the angle between the side wall and the body is in the range of 90° to 120°, and the thickness of the side wall is in the range of 0.2 mm to 2.5 mm.

[0009] In this way, the risk of the connecting component getting stuck during loading can be further reduced, thereby further improving the loading efficiency.

[0010] In some embodiments, when viewed along the thickness direction, the side wall is in a closed ring shape.

[0011] As a result, the protruding structure can have a better ability to resist deformation. When a plurality of connecting components are stacked together, it is not easy for the connecting components to get stuck with each other due to deformation of the protruding structure, thereby reducing the possibility of material jamming.

[0012] In some embodiments, the thickness of the side wall is in the range of 0.2 mm to 1.1 mm, and the angle between the side wall and the body is in the range of 90° to 95°; or the thickness of the side wall is in the range of 1.2 mm to 1.5 mm, and the angle between the side wall and the body is in the range of 90° to 100°; or the thickness of the side wall is in the range of 1.6 mm to 2.5 mm, and the angle between the side wall and the body is in the range of 90° to 120°.

[0013] When the thickness of the side wall is large, the ability of the side wall to resist deformation will be better, so the range of selection of the angle between the side wall and the body is larger. On the contrary, when the thickness of the side wall is small, the ability of the side wall to resist deformation will be reduced, so it is necessary to appropriately reduce the angle between the side wall and the body to reduce the possibility of the connecting parts getting stuck. Therefore, by making the thickness of the side wall and the angle between the side wall and the body have a suitable matching relationship, the possibility of the connecting parts getting stuck with each other can be reduced.

[0014] In some embodiments, the thickness of the side wall is greater than the thickness of the body; and / or the thickness of the side wall is greater than the thickness of the end wall.

[0015] Therefore, when the thickness of the side wall of the protruding structure is within an appropriate range, regardless of whether the thickness of the body is the same as or different from the thickness of the end wall, the possibility of the connecting parts getting stuck with each other can be effectively reduced, thereby effectively improving the loading efficiency and further improving the assembly efficiency of the battery cell.

[0016] In some embodiments, a ratio of the thickness of the body to the thickness of the end wall is in a range of 0.8 to 1.2.

[0017] The main body of the connecting component is used for welding with the electrode assembly, and the end wall of the raised structure is used for welding with the electrode terminal. The ratio of the thickness of the main body to the thickness of the end wall is moderate, which can be more conducive to the welding of the connecting component with the electrode assembly and the electrode terminal, thereby reducing the possibility of poor welding and cold welding and improving the welding quality.

[0018] In some embodiments, the shell assembly includes: a shell, the shell having an opening formed therein; and a top cover, the top cover being connected to the shell and closing the opening, the top cover having a lead-out hole formed therein, and the electrode terminal being formed on the top cover; wherein the protruding structure of the connecting component is at least partially connected to the electrode terminal formed on the top cover through the lead-out hole.

[0019] Thus, the connection component can be connected to the electrode terminal through the lead-out hole on the top cover, so as to lead out the electric energy of the electrode assembly in the shell through the electrode terminal.

[0020] A second aspect of the present application provides a battery, comprising: a box body and a battery cell as described in the first aspect of the present application and housed in the box body.

[0021] Since the battery includes battery cells, and the battery cells are not prone to the problem of connection component jamming during the production process, the assembly speed of the entire battery can be increased, thereby improving the production efficiency of the battery.

[0022] A third aspect of the present application provides an electrical device, which includes a battery cell as described in the first aspect of the present application or a battery as described in the second aspect of the present application for providing electrical energy.

[0023] Since the electric device includes a battery cell or a battery with high assembly efficiency, the production efficiency of the electric device can be effectively improved.

[0024] The fourth aspect of the present application provides an energy storage device, which includes the battery as described in the second aspect of the present application, and the battery can store electrical energy and provide electrical energy.

[0025] Since the energy storage device includes batteries with high assembly efficiency, the production efficiency of the energy storage device can be effectively improved.

[0026] Utility Model Effect

[0027] Through the present application, it is possible to prevent the occurrence of undesirable situations in which connecting components are stuck during the assembly and manufacturing of battery cells, thereby increasing the loading speed of connecting components and further improving the assembly efficiency of battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application;

[0030] Figure 2 A three-dimensional exploded schematic diagram of a battery provided in some embodiments of the present application;

[0031] Figure 3 A schematic diagram of a three-dimensional exploded structure of a battery cell provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of a three-dimensional structure of stacked connection components provided in some embodiments of the present application;

[0033] Figure 5 A schematic plan view of a stacked arrangement of connecting components provided in some embodiments of the present application;

[0034] Figure 6 for Figure 5 A schematic cross-sectional view of the stacked connection components along the AA direction;

[0035] Figure 7 for Figure 6 A local enlarged view of the connection component B in the stacked arrangement.

[0036] Description of Reference Numerals

[0037] 1-shell assembly; 11-accommodating space; 12-electrode terminal; 13-shell; 131-opening; 14-top cover; 141-lead-out hole; 2-electrode assembly; 3-connecting component; 3a-first surface; 3b-second surface; 31-main body; 32-raised structure; 32a-convex part; 32b-recessed part; 321-end wall; 322-side wall; 100-battery cell; 200-controller; 300-motor; 400-battery; 401-casing; 401a-cover; 401b-bottom plate; 1000-vehicle. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0046] Below, this application is described in detail.

[0047] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0048] During the assembly and manufacturing process of the battery cell, a connecting component is required to electrically connect the electrode assembly in the shell assembly with the electrode terminals on the shell assembly, so that the electrical energy of the electrode assembly can be conducted through the electrode terminals via the connecting component.

[0049] The connecting parts are usually stacked in the material collection area, and the connecting parts are clamped from the material collection area by a clamping device for subsequent welding and other operations. The connecting parts include a protruding structure. When multiple connecting parts are stacked together, due to the gravity of the connecting parts themselves and the compression between the connecting parts, the protruding structure may undergo certain deformation, or the protrusion of the protruding structure of the lower connecting part may extend to a greater extent into the concave part of the protruding structure of the upper connecting part, thereby causing two adjacent connecting parts to be stuck to each other, resulting in a material jam, that is, the adjacent connecting parts cannot be separated from each other. Once the material jam occurs, the clamping device may clamp two or more connecting parts at a time when clamping the connecting parts. At this time, it is necessary to stop the assembly of the battery cell, and manually remove the excess connecting parts before continuing the subsequent assembly operation, which seriously affects the assembly efficiency of the battery cell.

[0050] In the related art, some protrusions are formed on the side walls of the protruding structure to reduce the possibility of jamming when the connecting components are stacked. However, forming new protrusions on the protruding structure not only greatly increases the process cost, but also easily forms burrs during the processing, which may cause damage to the electrode assembly inside the battery cell and affect the reliability of the battery cell.

[0051] In view of the problems existing in the above-mentioned related technologies, the present application proposes a battery cell. The battery cell includes a shell assembly, an electrode assembly and a connecting component. A accommodating space is formed inside the shell assembly, and an electrode terminal is formed on the shell assembly. The electrode assembly is located in the accommodating space. The connecting component is used to connect the electrode assembly and the electrode terminal. The connecting component has a first surface and a second surface located on opposite sides along its thickness direction. The connecting component includes a body and a protruding structure. The protruding structure is arranged on the body. The protruding structure includes a protrusion formed on the first surface side and a recessed portion formed on the second surface side. The protruding structure includes an end wall and a side wall, and the side wall is connected between the end wall and the body. Wherein, the angle between the side wall and the body is in the range of 90° to 180°, and the thickness of the side wall is in the range of 0.1mm to 3mm.

[0052] Therefore, by making the angle between the side wall of the protruding structure and the main body and the thickness of the side wall of the protruding structure within an appropriate range, the protruding structure can be more resistant to deformation, and the contact area between the protruding structures of two adjacent connecting components can be smaller when the connecting components are stacked, thereby effectively reducing friction and further reducing the possibility of the stacked connecting components getting stuck to each other during loading, that is, reducing the possibility of the connecting components getting stuck, which is more conducive to material removal during the battery cell production process, improves assembly efficiency, and reduces the number of manual handling abnormalities (for example, clamping multiple connecting components at one time), which is more conducive to automated assembly.

[0053] The battery provided in the embodiments of the present application can be used, but is not limited to, in energy storage power supply systems, electrical devices such as vehicles, ships or aircraft, and energy storage devices such as energy storage containers and energy storage cabinets.

[0054] The battery provided in the embodiment of the present application can also be used in groups as a battery pack. The battery pack can also be used, but not limited to, in energy storage power supply systems, electrical devices such as vehicles, ships or aircraft, as well as energy storage devices such as energy storage containers and energy storage cabinets. The use of a battery pack can provide a higher total energy. Moreover, the battery pack is formed by placing a plurality of grouped batteries in a box, thereby having more reliable dustproof and waterproof performance, and therefore can be used in scenes where the use environment is more severe, humid, or even submerged in water.

[0055] The embodiment of the present application provides an electric device including the above-mentioned battery or battery pack for providing electric energy, and the electric device includes but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0056] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as a vehicle 1000 as an example for description. The following is a description with reference to the accompanying drawings.

[0057] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1As shown, a battery cell 100 is disposed inside the vehicle 1000, and the battery cell 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery cell 100 can be used to power the vehicle 1000, for example, the battery cell 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery cell 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0058] In some embodiments of the present application, the battery cell 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Figure 2 Schematic diagram of a three-dimensional exploded view of a battery 400 provided in an embodiment of the present application. Figure 2 As shown, the battery 400 includes a box body 401 and at least one battery cell 100. The box body 401 includes a cover body 401a and a bottom plate 401b. The cover body 401a covers the bottom plate 401b, so that a storage space for the battery cell 100 is formed between the bottom plate 401b and the cover body 401a.

[0060] In the battery 400, there can be multiple battery cells 100, and the multiple battery cells 100 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is placed in the accommodation space formed by the bottom plate 401b and the cover 401a; of course, the battery cell 100 can also be a battery module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the bottom plate 401b and the cover 401a. The battery 400 may also include other structures. For example, the battery 400 may also include a confluence component for realizing electrical connection between the multiple battery cells 100.

[0061] Below, refer to Figures 3 to 7 Some embodiments of the present application are described in detail.

[0062] Figure 3 A schematic diagram of a three-dimensional exploded structure of a battery cell provided in some embodiments of the present application. Figure 4 A schematic three-dimensional structure diagram of stacked connection components provided in some embodiments of the present application. Figure 5 A schematic plan view of the structure of stacked connection components provided in some embodiments of the present application. Figure 6 for Figure 5 Schematic cross-sectional view of the stacked connection components along the AA direction. Figure 7 for Figure 6 A local enlarged view of the connection component B in the stacked arrangement.

[0063] In some embodiments of the present application, the thickness direction is set for the convenience of description. Figure 4 and Figure 6 As shown by the arrow in , the direction where the arrow R1 is located is the thickness direction.

[0064] like Figures 3 to 7 As shown, the first aspect of the present application provides a battery cell 100. The battery cell 100 includes a shell assembly 1, an electrode assembly 2 and a connecting component 3. A housing space 11 is formed inside the shell assembly 1, and an electrode terminal 12 is formed on the shell assembly 1. The electrode assembly 2 is located in the housing space 11. The connecting component 3 is used to connect the electrode assembly 2 and the electrode terminal 12. The connecting component 3 has a first surface 3a and a second surface 3b located on opposite sides along its thickness direction. The connecting component 3 includes a body 31 and a protruding structure 32. The protruding structure 32 is arranged on the body 31. The protruding structure 32 includes a protruding portion 32a formed on the side of the first surface 3a and a concave portion 32b formed on the side of the second surface 3b. The protruding structure 32 includes an end wall 321 and a side wall 322. The side wall 322 is connected between the end wall 321 and the body 31. Among them, the angle A between the side wall 322 and the body 31 is in the range of 90° to 180°, and the thickness t0 of the side wall is in the range of 0.1mm to 3mm.

[0065] The battery cell 100 refers to a basic unit that can realize mutual conversion between chemical energy and electrical energy, and can be used to make a battery, thereby being used to supply power to an electrical device or an energy storage device.

[0066] The battery cell 100 may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0067] The battery cell 100 can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., which is not limited in the embodiments of the present application.

[0068] The battery cell 100 may be a soft-pack battery cell, a square-shell battery cell, or a cylindrical battery cell, which is not limited in the embodiment of the present application.

[0069] like Figure 3As shown, the battery cell 100 includes an electrode assembly 2, which is located in the receiving space 11 of the housing assembly 1. The electrode assembly 2 is generally stacked along the thickness direction of the battery cell 100. The electrode assembly 2 is a component in the battery cell 100 where electrochemical reactions occur.

[0070] Although not shown, the electrode assembly 2 includes a positive electrode sheet, a negative electrode sheet, and a separator. During the charge and discharge process of the battery cell 100, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet to prevent the positive and negative electrode sheets from short-circuiting, while allowing active ions to pass through.

[0071] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0072] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0073] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel or titanium with a silver surface treatment may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0075] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, or a foamed alloy. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0076] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0077] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as a metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel or titanium with a silver surface treatment may be used. The composite current collector may include a polymer material base and a metal layer. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, or an alloy foam. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0078] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0079] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0080] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0081] In some embodiments, the electrode assembly 2 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0082] In some embodiments, the electrode assembly 2 is a laminate structure.

[0083] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0084] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0085] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0086] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0087] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0088] In some embodiments, the shape of the electrode assembly 2 can be cylindrical, flat, or polygonal.

[0089] In some embodiments, the battery cell 100 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0090] In some embodiments, the electrode assembly 2 is provided with tabs, which can lead current out of the electrode assembly 2. The tabs include a positive tab and a negative tab.

[0091] The shell assembly 1 is the external protective shell of the battery cell 100, which is used to encapsulate the electrode assembly 2 and electrolyte, etc., and plays a certain protective role on the electrode assembly 2, thereby reducing the risk of damage or thermal runaway of the battery cell 100 due to mechanical collision, and improving the stability of the battery cell 100.

[0092] The housing assembly 1 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film, etc. If the battery cell 100 is a soft-pack battery cell, the housing assembly 1 is soft.

[0093] The housing assembly 1 is provided with two electrode terminals 12, which are respectively a positive electrode terminal and a negative electrode terminal. The electrode terminal 12 is connected to the electrode assembly 2 via the connecting component 3, so that the electric energy of the electrode assembly 2 can be extracted via the electrode terminal 12. The connecting component 3 can be fused when the electrode assembly 2 is short-circuited or overcharged or over-discharged, thereby reducing the risk of damage to the battery cell 100 or other components.

[0094] The number of connecting members 3 is also two, one end of one connecting member 3 is connected to the positive electrode terminal, and one end of the other connecting member 3 is connected to the negative electrode terminal.

[0095] Those skilled in the art should understand that the other ends of the two electrode terminals 12 can be directly connected to the electrode assembly 2, or can be indirectly connected to the electrode assembly 2 by connecting to the tabs on the electrode assembly 2. The tabs also include positive tabs and negative tabs.

[0096] The connecting component 3 has a first surface 3a and a second surface 3b located on opposite sides along its thickness direction. When the connecting component 3 is assembled on the battery cell 100, the first surface 3a is the surface away from the electrode assembly 2, and the second surface 3b is the surface facing the electrode assembly 2.

[0097] The connecting component 3 includes a main body 31 and a protruding structure 32. The protruding structure 32 is arranged on the main body 31. The second surface side of the main body 31 is used to connect with the electrode assembly 2. The embodiment of the present application does not specifically limit the shape of the main body 31 and can be set according to actual conditions.

[0098] The protruding structure 32 protrudes from the first surface 3a of the connecting member 3 in the thickness direction, thereby forming a protruding portion 32a on the first surface 3a side and a recessed portion 32b on the second surface 3b side. The protruding structure 32 includes an end wall 321 and a side wall 322, the side wall 322 is connected between the end wall 321 and the body 31, and the first surface side of the end wall 321 is used to connect with the electrode terminal 12.

[0099] In the embodiment of the present application, the body 31 and the protruding structure 32 of the connecting component 3 are formed into an integrated structure. For example, the protruding structure 32 of the connecting component 3 can be made by a stamping process. The stamping process has high precision and high production efficiency.

[0100] Of course, in some other embodiments, the main body 31 and the protruding structure 32 of the connecting component 3 may also be separate structures and assembled together using any appropriate process.

[0101] In order to save space and facilitate automatic loading, the connecting parts 3 are usually stacked up and down in the material taking area along the thickness direction, that is, the convex part 32a of the convex structure 32 of the lower connecting part 3 at least partially extends into the concave part 32b of the convex structure 32 of the upper connecting part 3. When the number of stacked connecting parts 3 is large, due to the gravity of the connecting parts 3 themselves and the compression of multiple connecting parts 3, the convex structure 32 may be deformed to a certain extent, or the convex part 32a of the convex structure 32 of the lower connecting part 3 may extend to a greater extent into the concave part 32b of the convex structure 32 of the upper connecting part 3, thereby increasing the contact area, causing the two adjacent connecting parts 3 to be stuck to each other, resulting in the phenomenon of material jamming, that is, the adjacent connecting parts 3 cannot be separated from each other. Once the material is stuck, the clamping device may clamp two or more connecting components 3 at a time when clamping the connecting component 3. At this time, it is necessary to stop the assembly of the battery cell 100, and manually remove the excess connecting components 3 before continuing the subsequent assembly operations, which seriously affects the assembly efficiency of the battery cell 100.

[0102] Therefore, if Figure 7 As shown, the embodiment of the present application adjusts the angle A between the side wall 322 of the protruding structure 32 of the connecting component 3 and the main body 31 and the thickness t0 of the side wall 322, so that the angle A between the side wall 322 and the main body 31 is in the range of 90° to 180°, and the thickness t0 of the side wall is in the range of 0.1 mm to 3 mm.

[0103] For example, the angle A between the side wall 322 and the body 31 can be 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170° or 180°, etc. The thickness t0 of the side wall can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm or 3.0 mm, etc.

[0104] Thus, by making the angle A between the side wall 322 of the protruding structure 32 of the connecting component 3 and the main body 31 and the thickness t0 of the side wall 322 of the protruding structure 32 within an appropriate range, the protruding structure 32 of the connecting component 3 can have better resistance to deformation, and when the connecting components 3 are stacked, the overlapping area and the contact area between the protruding structures 32 of two adjacent connecting components 3 are smaller, thereby effectively reducing the friction between adjacent connecting components 3, and further reducing the possibility of the stacked connecting components 3 getting stuck to each other during loading, that is, reducing the possibility of the connecting components 3 getting stuck, which is more conducive to the material picking of the clamping device during the production process of the battery cell 100, so that the clamping device only clamps one connecting component 3 at a time, thereby improving assembly efficiency and reducing the number of manual handling abnormalities (for example, clamping multiple connecting components 3 at one time), which is more conducive to automated assembly.

[0105] In some embodiments of the present application, the angle A between the side wall 322 and the body 31 is in the range of 90° to 120°, and the thickness t0 of the side wall 322 is in the range of 0.2 mm to 2.5 mm.

[0106] Thereby, the risk of the connecting component 3 being stuck during loading can be further reduced, thereby further improving the loading efficiency.

[0107] In some embodiments of the present application, when viewed along the thickness direction, the side wall 322 is in a closed ring shape, that is, the protruding structure 32 is generally in a truncated cone shape. Thus, the protruding structure 32 can have a better ability to resist deformation, and when multiple connecting components 3 are stacked together, the protruding structure 32 is not easy to deform, thereby reducing the possibility of the connecting components 3 getting stuck to each other and reducing the risk of material jamming.

[0108] Of course, those skilled in the art should understand that in some other embodiments, when observed along the thickness direction, the side wall 322 may also be linear or any other suitable shape, and the embodiment of the present application does not specifically limit the shape of the protruding structure 32.

[0109] In some embodiments of the present application, the thickness t0 of the side wall 322 is in the range of 0.2 mm to 1.1 mm, and the angle A between the side wall 322 and the body 31 is in the range of 90° to 95°, or the thickness t0 of the side wall 322 is in the range of 1.2 mm to 1.5 mm, and the angle A between the side wall 322 and the body 31 is in the range of 90° to 100°, or the thickness t0 of the side wall 322 is in the range of 1.6 mm to 2.5 mm, and the angle A between the side wall 322 and the body 31 is in the range of 90° to 120°.

[0110] When the thickness t0 of the side wall 322 is larger, the side wall 322 has a better ability to resist deformation. Therefore, when multiple connecting components 3 are stacked, the side wall 322 of the protruding structure 32 is less likely to deform. In this way, the angle A between the side wall 322 and the main body 31 can be larger, with a larger range of choices.

[0111] On the contrary, when the thickness t0 of the side wall 322 is small, the ability of the side wall 322 to resist deformation will be reduced. Therefore, it is necessary to appropriately reduce the angle A between the side wall 322 and the main body 31 so that the convex portion 32a of the convex structure 32 of the connecting component 3 at the bottom extends less into the concave portion 32b of the convex structure 32 of the connecting component 3 at the top, thereby effectively controlling the entry depth of the convex portion 32a and reducing the overlapping area between the convex portion 32a and the concave portion 32b of adjacent connecting components 3, thereby reducing the possibility of jamming of the connecting component.

[0112] That is to say, the relationship between the thickness t0 of the side wall 322 and the angle A between the side wall 322 and the main body 31 is roughly proportional. Therefore, the possibility of the connecting parts 3 getting stuck with each other can be reduced by making the thickness t0 of the side wall 322 and the angle A between the side wall 322 and the main body 31 have a suitable matching relationship.

[0113] Of course, those skilled in the art should understand that, here, the relationship between the thickness t0 of the side wall 322 and the angle A between the side wall 322 and the body 31 is generally proportional, but not strictly proportional, but means that when the thickness t0 of the side wall 322 is larger, the angle A between the side wall 322 and the body 31 can also be larger, and it does not necessarily have to be larger, that is, when the thickness t0 of the side wall 322 is larger, the angle A between the side wall 322 and the body 31 can also be smaller. However, when the thickness t0 of the side wall 322 is smaller, the angle A between the side wall 322 and the body 31 also needs to be smaller, so as to better reduce the risk of the connecting component 3 being stuck.

[0114] In some embodiments of the present application, the thickness t0 of the side wall 322 is greater than the thickness t1 of the body 31 , and / or the thickness t0 of the side wall 322 is greater than the thickness t2 of the end wall 321 .

[0115] Thus, the side wall 322 can have a better ability to resist deformation.

[0116] In the embodiment of the present application, the thickness t1 of the body 31 and the thickness t2 of the end wall 321 are the same, while in some other embodiments, the thickness t1 of the body 31 and the thickness t2 of the end wall 321 may be different.

[0117] When the thickness t0 of the side wall 322 of the protruding structure 32 is within an appropriate range, regardless of whether the thickness t1 of the main body 31 is the same as or different from the thickness t2 of the end wall 321 , the possibility of the connecting components 3 getting stuck with each other can be effectively reduced, thereby effectively improving the loading efficiency and further improving the assembly efficiency of the battery cell 100.

[0118] In some embodiments of the present application, a ratio of a thickness t1 of the body 31 to a thickness t2 of the end wall 321 is in a range of 0.8 to 1.2.

[0119] The connecting component 3 is usually connected to the electrode assembly 2 and the electrode terminal 12 by welding. The body 31 of the connecting component 3 is usually welded to the electrode assembly 2 by ultrasonic welding, and the end wall 321 of the protruding structure 32 of the connecting component 3 is usually welded to the electrode terminal 12 by laser welding.

[0120] Laser welding belongs to penetration welding, therefore, the thickness of the laser welding area (i.e., the end wall 321) should not be too thick. If the thickness is too thick, poor welding, explosion points and other undesirable conditions may occur, thereby affecting the welding quality. The ultrasonic welding area (i.e., the body 31) needs to have a certain thickness to ensure the local flow capacity of the current. Therefore, the thickness t2 of the end wall 321 and the thickness t1 of the body 31 can be different. Those skilled in the art should understand that, in the case of ensuring the flow, the thickness t1 of the body 31 can also be the same as the thickness t2 of the end wall 321. Of course, the body 31 can also be widened to make the body 31 have a good flow capacity.

[0121] In the embodiment of the present application, the ratio of the thickness t1 of the main body 31 to the thickness t2 of the end wall 321 is moderate, so that the main body 31 and the end wall 321 can have a suitable thickness, which can be more conducive to the welding of the connecting component 3 with the electrode assembly 2 and the electrode terminal 12, reduce the possibility of poor welding and cold welding, and improve the welding quality.

[0122] For example, the ratio of the thickness t1 of the body 31 to the thickness t2 of the end wall 321 may be 0.8, 0.9, 1.0, 1.1 or 1.2, etc.

[0123] In some embodiments of the present application, the housing assembly 1 includes a housing 13 and a top cover 14, wherein the housing 13 is formed with an opening 131. The top cover 14 is connected to the housing 13 and closes the opening 131, and the top cover 14 is formed with a lead-out hole 141, and the electrode terminal 12 is formed on the top cover 14. The protruding structure 32 of the connecting component 3 is at least partially connected to the electrode terminal 12 formed on the top cover 14 through the lead-out hole 141.

[0124] The top cover 14 covers the opening of the shell 13 , and defines together with the shell 13 a receiving space 11 for receiving the electrode assembly 2 .

[0125] The shape of the top cover 14 can be adapted to the shape of the opening 131 of the housing 13. Optionally, the top cover 14 can be made of a material with a certain hardness and strength, so that the top cover 14 is not easily deformed when squeezed or collided, so that the battery cell 100 can have a higher structural strength.

[0126] Exemplarily, the material of the top cover 14 includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, resin, plastic, etc.

[0127] The electrode terminal 12 is formed on the top cover 14, and the top cover 14 is formed with a lead-out hole 141. When the battery cell 100 is assembled, the protrusion structure 32 of the connection component 3 is at least partially connected to the electrode terminal 12 through the lead-out hole 141, so that the electric energy of the electrode assembly 2 in the housing 13 can be led out through the electrode terminal 12.

[0128] A second aspect of the present application provides a battery 400 , which includes a housing 401 and a battery cell 100 as described in the first aspect of the present application and housed in the housing 401 .

[0129] Since the battery 400 includes the battery cell 100 and the battery cell 100 is not prone to the problem of the connection component 3 getting stuck during the production process, the assembly efficiency is high, so the overall assembly speed of the battery 400 can be increased, thereby improving the production efficiency of the battery 400.

[0130] A third aspect of the present application provides an electrical device, which includes a battery cell 100 as described in the first aspect of the present application or a battery 400 as described in the second aspect of the present application for providing electrical energy.

[0131] Since the electric device includes the battery cell 100 or the battery 400 with high assembly efficiency, the production efficiency of the electric device can be effectively improved.

[0132] The fourth aspect of the present application provides an energy storage device, which includes the battery 400 as described in the second aspect of the present application, and the battery 400 can store electrical energy and provide electrical energy.

[0133] Since the energy storage device includes the battery 400 with high assembly efficiency, the production efficiency of the energy storage device can be effectively improved.

[0134] Specific examples of some embodiments of the present application are described below with reference to the accompanying drawings.

[0135] As a specific example, the battery cell 100 includes an adapter sheet (connecting component 3), which is used to connect the electrode assembly 2 and the electrode terminal 12, and the adapter sheet is formed with a bulge (convex structure 32). In the production process of the battery cell 100, in order to facilitate automatic loading, a plurality of adapter sheets are usually stacked together, and when a plurality of adapter sheets are stacked, they may get stuck in pairs under the influence of gravity and extrusion force. Therefore, it is necessary to adjust the draft angle of the adapter sheet (the angle A between the side wall 322 and the body 31) and the wall thickness of the bulge (the thickness t0 of the side wall 322) to reduce the possibility of the adapter sheet getting stuck.

[0136] Specifically, the draft angle of the adapter sheet is in the range of 90° to 180°, and optionally, in the range of 90° to 120°. The wall thickness of the convex hull is in the range of 0.1 mm to 3 mm, and optionally, in the range of 0.2 mm to 2.5 mm.

[0137] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: A housing assembly having a receiving space formed therein and an electrode terminal formed on the housing assembly; an electrode assembly, located in the accommodation space; and A connecting component, used to connect the electrode assembly and the electrode terminal, the connecting component having a first surface and a second surface located on opposite sides along the thickness direction thereof, the connecting component comprising: a body and a protruding structure, the protruding structure being arranged on the body, the protruding structure comprising a protruding portion formed on the first surface side and a concave portion formed on the second surface side, the protruding structure comprising an end wall and a side wall, the side wall being connected between the end wall and the body; The angle between the side wall and the body is in the range of 90° to 180°, and the thickness of the side wall is in the range of 0.1 mm to 3 mm.

2. The battery cell according to claim 1, characterized in that: An included angle between the side wall and the body is in a range of 90° to 120°, and a thickness of the side wall is in a range of 0.2 mm to 2.5 mm.

3. The battery cell according to claim 1, characterized in that: When viewed along the thickness direction, the side wall is in a closed ring shape.

4. The battery cell according to claim 3, characterized in that: The thickness of the side wall is in the range of 0.2 mm to 1.1 mm, and the angle between the side wall and the body is in the range of 90° to 95°; or The thickness of the side wall is in the range of 1.2 mm to 1.5 mm, and the angle between the side wall and the body is in the range of 90° to 100°; or The thickness of the side wall is in the range of 1.6 mm to 2.5 mm, and the angle between the side wall and the body is in the range of 90° to 120°.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The thickness of the side wall is greater than the thickness of the body; and / or The thickness of the side wall is greater than the thickness of the end wall.

6. The battery cell according to claim 5, characterized in that: A ratio of the thickness of the body to the thickness of the end wall is in a range of 0.8 to 1.

2.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The housing assembly comprises: a housing formed with an opening; and a top cover connected to the housing and closing the opening, the top cover being formed with a lead-out hole, and the electrode terminal being formed on the top cover; Wherein, the protruding structure of the connecting component is at least partially connected to the electrode terminal formed on the top cover through the lead-out hole.

8. A battery, characterized in that: include: A box body and at least one battery cell according to any one of claims 1 to 7 housed in the box body.

9. An electrical device, characterized in that: The electrical device comprises a battery cell according to any one of claims 1 to 7 or a battery according to claim 8 for providing electrical energy.

10. An energy storage device, characterized in that: The energy storage device comprises the battery as claimed in claim 8, and the battery is capable of storing electrical energy and providing electrical energy.

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