Battery monomer, battery and electric device

Abstract

The invention discloses a battery monomer (100), a battery (1000) and a power utilization device, the power utilization device comprises the battery monomer (100), the battery (1000) comprises the battery monomer (100), and the battery monomer (100) comprises a shell (10), an electrode terminal (20) and a flame-retardant structure (30). The electrode terminal (20) is arranged on the shell (10); the electrode terminal (20) is provided with a first wall (201) and a second wall (202) which are opposite to each other, and the first wall (201) is used for being welded with the busbar (300); at least a portion of the flame retardant structure (30) is located on a side of the second wall (202) away from the first wall (201). According to the technical scheme, at least part of the flame-retardant structure (30) is located on the side, away from the first wall (201), of the second wall (201) of the electrode terminal (20), so that the flame-retardant structure (30) can be opposite to the first wall (201), laser beams of the first wall (201) can be blocked, and the problem that the battery monomer (100) is welded through and burnt out due to laser leakage can be solved.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] In the battery field, the electrode terminals of a battery cell are usually welded to a busbar to achieve series connection, parallel connection or hybrid connection between multiple battery cells.

[0003] In some cases, during the welding process of the busbar and the electrode terminals of the battery cell, the laser beam generated during welding can easily penetrate the electrode terminals, and then penetrate or burn through the housing of the battery cell, causing damage to the battery cell.

[0004] Summary of the Invention

[0005] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, which can improve the problem of battery cells being welded through during the welding process between the battery cells and the busbar.

[0006] The technical solution adopted in the embodiment of this application is:

[0007] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0008] shell;

[0009] The electrode terminal is provided in the housing; the electrode terminal has a first wall and a second wall opposite to each other, and the first wall is used for welding to the busbar;

[0010] The flame retardant structure is at least partially located on a side of the second wall away from the first wall.

[0011] By adopting the above technical solution, by respectively arranging a first wall and a second wall on opposite sides of the electrode terminal, at least a portion of the flame-retardant structure is located on a side of the second wall away from the first wall, so that the flame-retardant structure is opposite to the first wall, thereby blocking the laser beam of the first wall, and further improving the problem of laser beam leakage, welding through, and burning of battery cells.

[0012] In some embodiments, the electrode terminal includes a pole and a connecting piece connected to the pole, the pole is provided in the housing, and the first wall and the second wall are respectively provided on opposite sides of the connecting piece.

[0013] By adopting the above technical solution, the electrode terminal is easily connected to the busbar, so that the electrode terminal and the busbar have a relatively large fixed conduction strength after welding.

[0014] In some embodiments, the connecting piece includes a first piece and a second piece bent and connected to the first piece, the first piece is connected to the pole; the first wall and the second wall are respectively provided on opposite sides of the second piece.

[0015] By adopting the above technical solution, the second sheet is bent and connected to the first sheet, so that the first wall of the second sheet can face the appropriate direction, making it easier for the first wall to contact the bus and be welded to the bus, thereby helping to simplify the welding process of the electrode terminal and the bus.

[0016] In some embodiments, the shell has a first shell wall along the first direction, the pole is arranged on the first shell wall, at least part of the second sheet is located outside one end of the first shell wall along the second direction, the first direction and the second direction intersect, and the first direction is perpendicular to the first shell wall.

[0017] By adopting the above technical solution, welding operations can be performed directly outside one end of the battery cell along the second direction, which facilitates the welding operation of the electrode terminal and the busbar of each battery cell, thereby facilitating the series connection, parallel connection or mixed connection of multiple battery cells.

[0018] In some embodiments, the second sheet extends along the first direction away from the housing, and the flame retardant structure is used to face the battery cells adjacent to the first housing wall.

[0019] By adopting the above technical solution, the first walls of multiple battery cells can be roughly turned away from the battery cells adjacent to the first shell wall along the second direction, so that the orientations of the first walls of multiple battery cells are roughly similar, which facilitates the welding operation of the bus bar to the electrode terminals of two adjacent battery cells.

[0020] In some embodiments, the second sheet extends along the first direction toward the outer shell, and at least a portion of the flame retardant structure is disposed between the second sheet and the outer shell.

[0021] By adopting the above technical solution, the directions of the first walls of the plurality of battery cells are made substantially similar, which facilitates the welding operation of the busbar to the electrode terminals of two adjacent battery cells.

[0022] In some embodiments, a flame retardant structure is provided on a side of the first sheet facing the second sheet.

[0023] By adopting the above technical solution, when the laser beam leaks from the second wall of the second sheet, the flame retardant structure on the first sheet can also block the laser beam, so the first flame retardant component and the second flame retardant component can achieve a double blocking effect on the laser beam, so as to doubly improve the problem of the laser beam melting through the battery cell or the adjacent battery cell.

[0024] In some embodiments, the housing further has a second shell wall, the first shell wall and the second shell wall are opposite to each other along a first direction; the second shell wall is provided with a groove, and the groove is used to avoid the electrode terminal of the battery cell adjacent to the second shell wall.

[0025] By adopting the above technical solution, two adjacent shells can be brought closer to each other along the first direction, so that the two adjacent battery cells have a higher structural compactness.

[0026] In some embodiments, the first wall has a welding position for welding to the busbar, and the orthographic projection of the flame retardant structure on the first wall covers the welding position.

[0027] By adopting the above technical solution, when the laser beam is radiated to the welding position of the first wall of the electrode terminal to achieve welding of the electrode terminal and the busbar, the flame retardant structure covers the welding position, thereby better blocking the laser beam leaking from the welding position, thereby improving the problem of laser beam leakage causing the battery cell where the electrode terminal is located or the adjacent battery cell to be welded through or burned.

[0028] In some embodiments, at least a portion of the fire retardant structure is secured to the second wall.

[0029] By adopting the above technical solution, the position of the flame retardant structure on the second wall is more stable and reliable, which facilitates the flame retardant structure to block the laser beam, thereby improving the problem of battery monomers being welded through.

[0030] In some embodiments, the flame retardant structure is a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, or a pre-oxidized silk aerogel.

[0031] By adopting the above technical solution, the flame retardant structure has a better effect of blocking the laser beam, thereby effectively achieving the protection effect on the battery cell where the flame retardant structure is located or the adjacent battery cells.

[0032] In some embodiments, the thermal conductivity of the flame retardant structure is ≤0.7 W / m·K; and / or the melting point of the flame retardant structure is greater than 800°C.

[0033] By setting the flame retardant structure to a structure with a lower thermal conductivity coefficient and / or a higher melting point, the flame retardant structure can have a weaker thermal conductivity effect, thereby making the flame retardant structure have a better effect of blocking the laser beam.

[0034] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0035] busbar;

[0036] A plurality of battery cells, wherein the first walls of the electrode terminals of two adjacent battery cells are welded to the busbar.

[0037] The battery provided in the embodiment of the present application, because it adopts the battery cells involved in the above-mentioned embodiment, can also improve the problem of laser beam leakage during welding causing the battery cells to be welded through or burned, thereby making the battery have higher quality.

[0038] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery.

[0039] The battery provided in the embodiment of the present application, due to the use of the battery cells involved in the above-mentioned embodiment, can also improve the problem of laser beam leakage during welding causing the battery cells to be welded through or burned, thereby making the battery cells have higher quality and thus making the electrical device also have higher quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0042] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0043] FIG3 is a perspective schematic diagram of a battery cell provided in some embodiments of the present application;

[0044] FIG4 is an enlarged view of point A in FIG3 ;

[0045] FIG5 is a schematic diagram of the coordination of two battery cells and a busbar provided in some embodiments of the present application;

[0046] Figure 6 is an enlarged view of point B in Figure 5;

[0047] FIG7 is a side view of FIG5;

[0048] FIG8 is an enlarged view of point C in FIG7 ;

[0049] FIG9 is a side view of two battery cells and a busbar provided in other embodiments of the present application;

[0050] FIG10 is an enlarged view of point D in FIG9 ;

[0051] FIG11 is a schematic diagram of two battery cells and a busbar provided in some other embodiments of the present application;

[0052] FIG12 is an enlarged view of point E in FIG11 .

[0053] Among them, the reference numerals in the figures are:

[0054] 1000-battery; 2000-controller; 3000-motor; 100-battery cell; 100a-first battery cell; 100b-second battery cell; 200-housing; 210-first part; 220-second part; 300-bus; 10-housing; 101-groove; 102-first shell wall; 103-second shell wall; 11-shell; 12-end cover; 13-flanged edge; 20-electrode terminal; 201-first wall; 202-second wall; 21-pole; 22-connecting plate; 221-first sheet; 222-second sheet; 30-flame retardant structure; 31-first flame retardant component; 32-second flame retardant component; 40-adhesive layer; Z-first direction; Y-second direction. DETAILED DESCRIPTION

[0055] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0056] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing 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 and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0058] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0059] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0060] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0061] In the battery field, multiple battery cells are typically connected electrically in series, parallel, or in a hybrid configuration using a busbar. Hybrid configuration refers to the battery cells being connected in both series and parallel. Specifically, the electrode terminals of two adjacent battery cells are laser welded to the busbar to achieve electrical connection.

[0062] In some cases, during laser welding of busbars and electrode terminals of battery cells, the generated laser beam can easily penetrate the electrode terminals and leak, and then penetrate or burn through the battery cell casing or end cover, causing damage to the quality of the battery cell.

[0063] It's important to note that laser welding is a highly efficient and precise welding method that utilizes a high-energy-density laser beam as a heat source. During the laser welding process, the laser beam radiates toward the busbar and electrode terminals. The heat generated by the laser beam diffuses within these terminals, melting them to form a specific molten pool. This ultimately secures and connects the busbar and electrode terminals.

[0064] Since the electrode terminal is configured as a metal structure with conductive properties, the electrode terminal has high thermal conductivity and is easy to melt under high temperature conditions. Based on this, during the laser welding process, if the heat generated by the laser beam is too large or the thickness of the electrode terminal is too small, the heat generated by the laser beam will diffuse inside the electrode terminal, causing the electrode terminal to be melted through by the heat generated by the laser beam. In this way, after the electrode terminal is melted through, the laser beam will leak through the melt-through position of the electrode terminal to the side of the electrode terminal facing away from the busbar, and then leak into the shell or end cover of the battery cell, causing the shell or end cover of the battery cell to be melted through by the laser beam, which can easily damage the quality of the battery cell.

[0065] Based on the above considerations, the first aspect of an embodiment of the present application provides a battery cell, by arranging a first wall and a second wall opposite to the electrode terminal, the first wall is used for welding to the bus bar, and at least a part of the flame-retardant structure is located on the side of the second wall away from the first wall, so that the flame-retardant structure is opposite to the first wall, thereby blocking the laser beam of the first wall, and further improving the problem of laser beam leakage, so as to weld through and burn the battery cell.

[0066] In some embodiments of the present application, the battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries or battery cells as power sources.

[0067] The battery mentioned in the embodiments of this application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to multiple battery cells being connected in both series and parallel mode.

[0068] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0069] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0070] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0071] In some embodiments, the battery may be an energy storage device, which includes an energy storage cabinet, an energy storage container, etc.

[0072] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric cars, electric ships, and electric airplanes. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Vehicles may include gasoline-powered vehicles, gas-powered vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid electric vehicles, or extended-range electric vehicles.

[0073] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0074] Please refer to Figure 1, which is a schematic diagram of a vehicle provided in some embodiments of the present application. The vehicle is internally provided with the aforementioned battery 1000, which can be located at the bottom, front, or rear of the vehicle. Battery 1000 can be used to power the vehicle, for example, serving as the vehicle's operating power source.

[0075] The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to power the motor 3000, for example, to meet the vehicle's starting, navigation, and driving needs. In some embodiments of the present application, the battery 1000 can serve not only as the vehicle's operating power source, but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0076] FIG2 is an exploded view of a battery 1000 provided in some embodiments of the present application. Referring to FIG2 , the battery 1000 includes a battery cell 100 and a housing 200 , wherein the housing 200 is used to accommodate the battery cell 100 .

[0077] The housing 200 is a component that accommodates the battery cells 100. The housing 200 provides a storage space for the battery cells 100 so that the battery cells 100 have higher reliability and stability. The housing 200 can adopt a variety of structures. In some embodiments, the housing 200 may include a first portion 210 and a second portion 220, which cover each other and jointly define the above-mentioned storage space. The first portion 210 may be a hollow structure with an opening at one end, and the second portion 220 is a plate-like structure. The second portion 220 covers the open side of the first portion 210, so that the first portion 210 and the second portion 220 jointly define the above-mentioned storage space. Alternatively, the first portion 210 and the second portion 220 may both be hollow structures with an opening at one end, as shown in Figure 2, the open side of the first portion 210 covers the open side of the second portion 220, so that the first portion 210 and the second portion 220 jointly define the above-mentioned storage space. In addition, the box body 200 composed of the first part 210 and the second part 220 can be in various shapes, such as a cylinder, a cuboid, etc.

[0078] In the battery 1000, the number of battery cells 100 can be one or more. When the number of battery cells 100 is more than one, the multiple battery cells 100 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 100 are connected in series and in parallel. The multiple battery cells 100 can be connected in series, in parallel, or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 100 can be directly accommodated in the above-mentioned accommodation space formed by the case 200. The multiple battery cells 100 can also be connected in series, in parallel, or in a mixed connection to form multiple modules, and each module is then fixed by a corresponding fixing assembly to form the above-mentioned battery module, that is, multiple battery cells 100 constitute multiple above-mentioned battery modules, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the accommodation space defined by the case 200.

[0079] A battery cell 100 is the smallest unit that stores and outputs electrical energy. It can be a secondary battery or a primary battery. It can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. It can be cylindrical, flat, rectangular, or have other shapes.

[0080] FIG3 is a schematic diagram of a battery cell 100 provided in some embodiments of the present application. Referring to FIG3 , the battery cell 100 includes a housing 10 and an electrode assembly (not shown).

[0081] The electrode assembly is the component in the battery cell 100 where the electrochemical reaction occurs. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The tab of the positive electrode sheet is the positive tab, and the tab of the negative electrode sheet is the negative tab. The positive tab and the negative tab can be located together at one end of the main body or respectively at both ends of the main body. The tab is the current transmission end of the electrode assembly, which is used to transmit current.

[0082] In the battery cell 100 , the number of electrode assemblies may be one or more.

[0083] In some cases, the electrode assembly may also be referred to as a battery cell, a bare battery cell, a wound body, a laminated body, etc.

[0084] In some embodiments, the battery cell 100 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0085] In some embodiments, the housing 10 includes a shell 11 and an end cap 12 . The shell 11 and the end cap 12 are components for jointly defining an internal environment of the battery cell 100 . The internal environment defined by the shell 11 and the end cap 12 is used to accommodate an electrode assembly and an electrolyte.

[0086] In some implementations, the housing 11 and the end cap 12 may be separate components. Specifically, the housing 11 has an opening, and the end cap 12 is positioned over the opening of the housing 11 to define the internal environment of the battery cell 100 together with the housing 11 and isolate the internal environment of the battery cell 100 from the external environment. For example, as shown in FIG3 , for a thinner sheet battery, after the end cap 12 is positioned over the opening of the housing 11, the edges of the end cap 12 are secured to the edges of the opening of the housing 11 by welding.

[0087] In other implementations, the shell 11 and the end cap 12 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 12 and the shell 11 before the electrode assembly is placed in the shell. After the electrode assembly is placed in the shell, when the electrode assembly needs to be packaged, the end cap 12 is placed over the shell 11. For example, when the battery cell 100 is a soft-pack battery, the aluminum-plastic film may be punched to form the shell 11 and end cap 12 of the battery cell 100, and then the electrode assembly may be placed in the internal environment formed by the punched aluminum-plastic film, and then the opening of the aluminum-plastic film may be fixed by side sealing, top sealing, or other edge sealing methods. Of course, the battery cell 100 is not limited to a soft-pack battery, and the material of the shell 11 and the end cap 12 is not limited to aluminum-plastic film.

[0088] It should be added that the number of the end cap 12 can be one. Of course, the number of the end cap 12 can also be two, and the two end caps 12 are respectively arranged at the two ends of the housing 11.

[0089] In the above two implementations, the housing 11 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly. Furthermore, the housing 11 and end cap 12 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and this is not particularly limited in the present embodiment.

[0090] Among them, the battery cell 100 involved in the embodiment of the present application can be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery cell of other shapes. Prismatic batteries include square-shell batteries, blade-shaped batteries, polygonal batteries, etc.

[0091] It should be noted that although the battery cell 100 described in the embodiments of this application is an improvement based on the technical issues existing in laser welding, other welding methods besides laser welding can also be used when welding the battery cell 100. For ease of description, the technical solutions of this application are described using laser welding as an example in each embodiment of this application.

[0092] Figure 3 shows a stereoscopic schematic diagram of a battery cell 100 provided in some embodiments of the present application, Figure 4 shows a partial enlarged view of Figure 3, Figure 5 shows a partial stereoscopic schematic diagram of a battery 1000 provided in some embodiments of the present application, Figure 6 shows a partial enlarged view of Figure 5, Figure 7 shows a side view of Figure 5, and Figure 8 shows a partial enlarged view of Figure 7. Please refer to Figures 3 to 8 together. The battery cell 100 provided in some embodiments of the present application includes a housing 10, an electrode terminal 20 and a flame retardant structure 30. The electrode terminal 20 is provided on the housing 10. The electrode terminal 20 has a first wall 201 and a second wall 202 opposite to each other, and the first wall 201 is used for welding to the busbar 300. At least a portion of the flame retardant structure 30 is located on the side of the second wall 202 away from the first wall 201.

[0093] The electrode terminal 20 is the current transmission end of the battery cell 100 and is used to transmit current. Specifically, in some embodiments, the battery cell 100 also includes an electrode assembly disposed within the housing 10. The electrode terminal 20 is disposed within the housing 10 and is electrically connected to the electrode assembly of the battery cell 100. The electrode terminal 20 can be welded to the busbar 300 to achieve electrical connection between the electrode terminal 20 and the busbar 300. When the busbar 300 is welded to the electrode terminals 20 of two adjacent battery cells 100, the two battery cells 100 are electrically connected.

[0094] The electrode terminal 20 can be made of, but is not limited to, a metal structure such as copper or aluminum. This ensures that the electrode terminal 20 has good thermal conductivity and a low melting point, allowing it to melt under high-temperature conditions to form a molten pool. This allows the electrode terminal 20 to be welded to the busbar 300 by melting under the heat generated by the laser beam, thereby achieving a welded connection with the busbar 300. Furthermore, the electrode terminal 20 can achieve electrical continuity with the electrode assembly and the busbar 300 through its metallic properties.

[0095] The electrode terminal 20 has two opposite sides, one of which has a first wall 201 and the other has a second wall 202. The first wall 201 and the second wall 202 are both wall surfaces of the electrode terminal 20.

[0096] The first wall 201 is used for welding the busbar 300, and at least a portion of the flame-retardant structure 30 is located on a side of the second wall 202 of the electrode terminal 20 away from the first wall 201, so that at least a portion of the flame-retardant structure 30 and the busbar 300 are located on opposite sides of the electrode terminal 20. In this way, at least a portion of the flame-retardant structure 30 can be positioned opposite the busbar 300, thereby blocking the laser beam generated when welding the busbar 300.

[0097] The busbar 300 may be disposed on the first wall 201 of the electrode terminal 20 and welded to the electrode terminal 20 , so that the electrode terminal 20 is welded and fixed to the busbar 300 through the first wall 201 and is electrically connected.

[0098] The flame retardant structure 30 may be fixed to the second wall 202 or to other locations of the battery cell 100 except the second wall 202 . For example, the flame retardant structure 30 may be, but is not limited to, fixed to the housing 10 .

[0099] The flame-retardant structure 30 is a component with a flame-retardant effect. Specifically, the flame-retardant structure 30 has a low thermal conductivity and a high melting point. When the laser beam is irradiated onto the flame-retardant structure 30, the heat generated by the laser beam is difficult to diffuse inside the flame-retardant structure 30, making it difficult to melt the flame-retardant structure 30. In this way, the laser beam has difficulty melting through the flame-retardant structure 30, which means that the flame-retardant structure 30 can effectively block the laser beam. Among them, the portion of the flame-retardant structure 30 on the second wall 202 is the first flame-retardant component 31. In some embodiments, as shown in Figures 3 and 4, the first flame-retardant component 31 is a sheet-like structure.

[0100] In the battery cell 100 provided in the embodiment of the present application, the electrode terminal 20 has a first wall 201 and a second wall 202 that are opposite to each other. The first wall 201 is used for welding to the busbar 300, and at least a portion of the flame-retardant structure 30 is located on a side of the second wall 202 that is away from the first wall 201. Therefore, during the welding process between the electrode terminal 20 and the busbar 300, the busbar 300 is first positioned on the first wall 201 of the electrode terminal 20, and then a laser beam is radiated to the electrode terminal 20 and the busbar 300, so that the heat generated by the laser beam diffuses within the electrode terminal 20 and the busbar 300, thereby melting the electrode terminal 20 and the busbar 300 to form a molten pool, thereby achieving the effects of welding fixation and electrical continuity.

[0101] When the heat generated by the laser beam is excessive, or the electrode terminal 20 is relatively small in the distribution direction along the first wall 201 and the second wall 202, the heat generated by the laser beam will melt through the electrode terminal 20, causing the laser beam to leak from the first wall 201 to the second wall 202 of the electrode terminal 20 through the melt-through location of the electrode terminal 20, thereby radiating to the flame-retardant structure 30 on the second wall 202. Due to the low thermal conductivity and high melting point of the flame-retardant structure 30, the heat generated by the laser beam is difficult to diffuse within the flame-retardant structure 30, making it difficult to melt the flame-retardant structure 30. In other words, the flame-retardant structure 30 can block the laser beam from leaking from the first wall 201 to the second wall 202 of the electrode terminal 20, thereby making it difficult for the laser beam to leak from the second wall 202 of the electrode terminal 20 to the outside.

[0102] If the flame-retardant structure 30 is not provided, when the laser beam welds through the electrode terminal 20, so that the laser beam leaks to the outside from the second wall 202 of the electrode terminal 20, the laser beam will leak to the battery cell 100 where the electrode terminal 20 is located or the adjacent battery cell 100, and then weld through the outer shell 10 of the battery cell 100 where the laser beam is located or the outer shell 10 of the adjacent battery cell 100, thereby causing damage to the outer shell 10 where the laser beam is located or the adjacent outer shell 10. In this embodiment, the flame-retardant structure 30 is opposite to the first wall 201, thereby blocking the laser beam leaking from the second wall 202 of the electrode terminal 20, thereby improving the problem of the laser beam leaking to the outside, so as to leak to the outer shell 10 where the electrode terminal 20 is located or the adjacent outer shell 10, thereby achieving a protective effect on the battery cell 100 where the electrode terminal 20 is located or the adjacent battery cell 100. Based on this, the problem of the laser beam leaking to the outside and welding through or burning the battery cell 100 can be improved.

[0103] When the laser beam is radiated to the electrode terminal 20 and the bus 300, the laser beam can be radiated to the position of the electrode terminal 20 and the bus 300 corresponding to the flame retardant structure 30 in the distribution direction along the first wall 201 and the second wall 202, so that the flame retardant structure 30 can block the laser beam accordingly.

[0104] In some cases, to improve the problem of laser beam leakage from the first wall 201 of the electrode terminal 20 to the outside of the second wall 202, the dimensions of the electrode terminal 20 in the distribution direction of the first wall 201 and the second wall 202 are usually increased. This can improve the problem of the laser beam melting through the electrode terminal 20. However, such a configuration increases the volume and weight of the electrode terminal 20, and thus also increases the weight and volume of the battery cell 100. The battery cell 100 provided in the embodiment of the present application, by providing a flame-retardant structure 30 on the side of the second wall 202 of the electrode terminal 20 away from the first wall 201, does not need to be overly concerned about the problem of the electrode terminal 20 being welded through. Even if the electrode terminal 20 is welded through during welding, the leaked laser beam can be blocked by the flame-retardant structure 30. In this way, while achieving the welding effect of the electrode terminal 20 and the busbar 300, the dimensions of the electrode terminal 20 in the distribution direction of the first wall 201 and the second wall 202 can be minimized, thereby reducing the volume and weight of the battery cell 100 to a certain extent, thereby helping to improve the energy density of the battery 1000 including the battery cell 100.

[0105] 3 to 8 , the electrode terminal 20 includes a post 21 and a connecting piece 22 . The post 21 is disposed on the housing 10 , the connecting piece 22 is connected to the post 21 , and the first wall 201 and the second wall 202 are disposed on opposite sides of the connecting piece 22 .

[0106] Specifically, the electrode post 21 is disposed on the housing 10 and is electrically connected to the electrode assembly of the battery cell 100 .

[0107] The connecting piece 22 is a sheet-shaped metal structure such as a copper sheet or an aluminum sheet. The connecting piece 22 and the pole 21 can be fixed and connected by bolts, rivets, or riveting.

[0108] A portion of the connecting piece 22 is fixedly connected to the pole 21, and the first wall 201 and the second wall 202 are respectively provided on opposite sides of the other portion of the connecting piece 22. Specifically, the first wall 201 is provided on one side of the other portion of the connecting piece 22 along its thickness direction, and the second wall 202 is provided on the other side of the other portion of the connecting piece 22 along its thickness direction.

[0109] By adopting the above technical solution, the electrode terminal 20 is configured to include a pole 21 and a connecting piece 22, so that the connecting piece 22 can be extended to a suitable position, which facilitates contact and welding between the electrode terminal 20 and the busbar 300, thereby simplifying the welding process between the electrode terminal 20 and the busbar 300. Based on this, compared with the solution in which the electrode terminal 20 is completely located between two adjacent housings 10, the area for welding is more open, the welding operation is easier to perform, and the risk of laser beam leakage to the battery cell 100 or adjacent battery cells 100 during the welding process is reduced, thereby effectively achieving a protective effect on the battery cell 100 where the electrode terminal 20 is located or adjacent battery cells 100. In addition, the first wall 201 of the electrode terminal 20 can be arranged on the surface of the connecting piece 22, that is, the first wall 201 can be located on one side of the corresponding part of the connecting piece 22 along the thickness direction. In this way, the first wall 201 of the connecting piece 22 has a larger area, which is also convenient for the welding operation of the electrode terminal 20 and the busbar 300, and can make the electrode terminal 20 and the busbar 300 have a larger fixed conduction strength after the welding is completed.

[0110] It should be noted that when welding the electrode terminal 20 to the busbar 300, the busbar 300 can be first placed on the first wall 201 of the connecting piece 22, and then a laser beam can be radiated to the busbar 300 and the connecting piece 22, so that the heat generated by the laser beam diffuses within the busbar 300 and the connecting piece 22, thereby melting the connecting piece 22 and the busbar 300 to form a molten pool, thereby achieving the effect of welding fixed conduction. When the laser beam melts through the connecting piece 22 from the first wall 201, the laser beam leaks out from the weld penetration position of the connecting piece 22 and is blocked by the flame-retardant structure 30, making it difficult to leak to the battery cell 100 where the flame-retardant structure 30 is located or to an adjacent battery cell 100, thereby improving the problem of the laser beam leaking to the battery cell 100 where the connecting piece 22 is located or to an adjacent battery cell 100.

[0111] In some embodiments, referring to Figures 3 to 8 , the connecting piece 22 includes a first piece 221 and a second piece 222. The second piece 222 is bent and connected to the first piece 221, and the first piece 221 is connected to the pole 21. The first wall 201 and the second wall 202 are respectively disposed on opposite sides of the second piece 222.

[0112] It can be understood that the first sheet 221 is the portion of the connecting sheet 22 used to connect to the pole 21, and the second sheet 222 is the portion of the connecting sheet 22 used to weld the busbar 300. Both the first sheet 221 and the second sheet 222 are sheet-like structures. Of the two opposing sides of the second sheet 222 along its thickness, one side is the first wall 201, and the other side is the second wall 202. That is, one side of the second sheet 222 along its thickness is used to weld the busbar 300, and at least a portion of the flame-retardant structure 30 is located on the other side of the second sheet 222 along its thickness.

[0113] Among them, the first wall 201 is arranged on one side of the second sheet 222 along the thickness direction of the second sheet 222, so that the first wall 201 has a larger area, so that it can contact the bus 300 through a larger area and weld with the bus 300, thereby helping to improve the convenience and strength of welding between the bus 300 and the electrode terminal 20.

[0114] By adopting the above technical solution, the second sheet 222 is bent and connected to the first sheet 221, so that the first wall 201 of the second sheet 222 can face the appropriate direction. For example, the first wall 201 of the second sheet 222 can face a direction that intersects the distribution direction of the multiple battery cells 100, so that the first wall 201 of the second sheet 222 faces the outside of the housing 10. For example, as shown in Figures 5 to 8, the multiple battery cells 100 are arranged along direction Z, and the first wall 201 of the second sheet 222 can be set in direction Y, which is perpendicular to direction Y. This makes it easier for the first wall 201 to contact the busbar 300 and be welded to the busbar 300, thereby helping to simplify the welding process between the electrode terminal 20 and the busbar 300.

[0115] It should be noted that since the second sheet 222 is bent relative to the first sheet 221, the first wall 201 of the second sheet 222 can face a suitable direction, for example, the first wall 201 can face the outside of the housing 10. In this way, one side of the second wall 202 of the second sheet 222 is easily oriented toward the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. If the flame retardant structure 30 is not provided, when the heat generated by the laser beam is too large or the thickness of the second sheet 222 is too small, the laser beam can easily melt through the second sheet 222 along the thickness direction of the second sheet 222 and leak through the second wall 202 of the second sheet 222 to the outside, and then leak to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. In the battery cell 100 according to the embodiment of the present application, at least a portion of the flame-retardant structure 30 is disposed on the second wall 202 of the second sheet 222. During the welding process, the flame-retardant structure 30 can block the laser beam from leaking to one side of the second wall 202 of the second sheet 222 when the laser beam melts through the second sheet 222, thereby improving the problem of the laser beam leaking to the battery cell 100 where the second sheet 222 is located or to adjacent battery cells 100. In addition, because the flame-retardant structure 30 can block the laser beam, the thickness of the second sheet 222 can be appropriately reduced, thereby helping to reduce the weight and volume of the electrode terminal 20, and thus helping to increase the energy density of the battery 1000 composed of the battery cells 100 where the electrode terminal 20 is located.

[0116] In some embodiments, please refer to Figures 3 to 8 together. The housing 10 has a first housing wall 102 along a first direction Z. The pole 21 is disposed on the first housing wall 102 of the housing 10. At least a portion of the second sheet 222 is located outside one end of the first housing wall 102 along a second direction Y. The first direction Z and the second direction Y intersect, and the first direction Z is perpendicular to the first housing wall 102.

[0117] As shown in Figures 3 and 4, the first direction Z is the direction Z shown in the figures, and the second direction Y is the direction Y shown in the figures. The first direction Z and the second direction Y intersect, which means that the first direction Z and the second direction Y are not parallel. The first direction Z and the second direction Y may be perpendicular or non-perpendicular. In some embodiments, as shown in Figures 3 and 4, the shell 10 is in the shape of a rectangular parallelepiped, and the shell 10 has a length direction, a thickness direction and a width direction. The first direction Z may be the thickness direction of the shell 10, and the second direction Y may be the length direction of the shell 10. In this case, the width direction of the shell 10 is the direction X shown in the figure. Of course, the first direction Z may also be the length direction or the width direction of the shell 10, and the second direction Y may also be the width direction or the thickness direction of the shell 10.

[0118] By adopting the above technical solution, at least a portion of the second sheet 222 is located outside one end of the first shell wall 102 along the second direction Y. Based on this, the multiple battery cells 100 of the battery 1000 can be arranged along a direction intersecting the second direction Y (e.g., the first direction Z). As shown in Figures 5 to 8, at least a portion of the second sheet 222 of each battery cell 100 is located outside one end of the multiple shells 10 along the second direction Y. Therefore, the first wall 201 of the second sheet 222 of each battery cell 100 is located outside one end of the multiple shells 10 along the second direction Y. In this way, there is no need to extend the busbar 300 between two adjacent battery cells 100 for welding. Instead, the welding operation can be performed directly outside one end of the battery cell 100 along the second direction Y, facilitating the welding operation between the electrode terminal 20 of each battery cell 100 and the busbar 300, thereby facilitating the series, parallel, or hybrid connection of multiple battery cells 100.

[0119] Because at least a portion of the second sheet 222 extends beyond one end of the first shell wall 102 along the second direction Y, and the second sheet 222 is bent and connected to the first sheet 221, the second wall 202 of the second sheet 222 is easily oriented toward the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. If the flame-retardant structure 30 is not provided, during the welding process, if the laser beam melts through the second sheet 222, it is easy to radiate to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located. By providing the flame-retardant structure 30, the laser beam leaking through the melt-through position of the second sheet 222 can be effectively blocked, thereby effectively improving the laser beam radiation to the battery cell 100 or the adjacent battery cell 100 where the second sheet 222 is located, thereby achieving a protective effect on the battery cell 100 or the adjacent battery cell 100 where the flame-retardant structure 30 is located.

[0120] For example, as shown in Figures 3 and 4 , the first direction Z is the thickness direction of the outer shell 10, meaning that at least a portion of the terminal 21 is disposed on a wall of the outer shell 10 along the thickness direction. This can also be understood as the terminal 21 being disposed on the larger surface of the outer shell 10, thereby facilitating the placement of the terminal 21 on the outer shell 10. When there are multiple battery cells 100, the outer shells 10 of the multiple battery cells 100 are typically distributed sequentially along the first direction Z, meaning that the thickness directions of the multiple outer shells 10 are parallel to each other, as shown in Figures 5 to 8 . Consequently, at least a portion of the terminal 21 is typically located between two adjacent outer shells 10, making it difficult to weld to the busbar 300. The battery cell 100 provided in the embodiment of the present application extends at least a portion of the second sheet 222 to the outside of one end of the first shell wall 102 along the direction intersecting the first direction Z (the second direction Y), so that the second sheet 222 and the first wall 201 of the electrode terminal 20 are both located outside one end of the outer shell 10 along the direction intersecting the first direction Z (the second direction Y). In this way, during welding, there is no need to extend the busbar 300 between two adjacent outer shells 10. Instead, the busbar 300 and the second sheet 222 can be welded directly outside the outer shell 10, thereby making the welding of the electrode terminal 20 and the busbar 300 more convenient, thereby facilitating the series connection, parallel connection or mixed connection of multiple battery cells 100.

[0121] In some embodiments, referring to Figures 3 and 4, the pole 21 is provided at the end of the housing 10 along the second direction Y. Thus, there is no need to use too many connecting pieces 22, and at least a portion of the second piece 222 of the connecting piece 22 can extend to the outside of one end of the first housing wall 102 along the second direction Y.

[0122] In some embodiments, referring to FIG. 3 to FIG. 8 , the second sheet 222 extends along the first direction Z away from the first casing wall 102 , and the flame-retardant structure 30 faces the battery cells 100 adjacent to the first casing wall 102 .

[0123] The second piece 222 is extended along the first direction Z away from the first shell wall 102 , which specifically means that the second piece 222 generally extends parallel to the first direction Z. The second piece 222 can extend straight, curved, or obliquely along the first direction Z away from the first shell wall 102 .

[0124] When the housing 10 of multiple battery cells 100 is arranged sequentially along the first direction Z, two adjacent battery cells 100 are defined as a first battery cell 100a and a second battery cell 100b, respectively. The second battery cell 100b is positioned adjacent to the first housing wall 102 of the first battery cell 100a. As shown in Figures 5 to 8, at least a portion of the second sheet 222 of the first battery cell 100a extends beyond one end of the first battery cell 100a in the second direction Y, is located beyond one end of the second battery cell 100b in the second direction Y, and faces the second battery cell 100b. The flame-retardant structure 30 of the first battery cell 100a is positioned on the side of the second sheet 222 facing the second battery cell 100b, with the first wall 201 of the first battery cell 100a facing away from the second battery cell 100b. In other words, the flame-retardant structure 30 faces the battery cell 100 adjacent to the first housing wall 102, and the first wall 201 of the second sheet 222 faces away from the adjacent battery cell 100.

[0125] By adopting the above technical solution, the first walls 201 of multiple battery cells 100 can be roughly facing away from the battery cells 100 adjacent to the first shell wall 102 along the second direction Y, so that the orientations of the first walls 201 of multiple battery cells 100 are roughly similar, which facilitates the welding operation of the busbar 300 to the electrode terminals 20 of two adjacent battery cells 100.

[0126] In addition, the flame-retardant structure 30 is arranged on the side of the second sheet 222 facing the battery cell 100 adjacent to the first shell wall 102, so that during the welding process, when the laser beam melts through the second sheet 222, the flame-retardant structure 30 can block the laser beam passing through the melting position of the second sheet 222, thereby improving the problem of the laser beam leaking to the battery cell 100 adjacent to the first shell wall 102, and further improving the problem of the laser beam leakage during the welding process causing the adjacent battery cell 100 to be welded through or burned.

[0127] Figure 9 shows a partial side view of a battery 1000 according to some other embodiments of the present application, and Figure 10 shows an enlarged partial view of Figure 9. In some embodiments, referring to Figures 9 and 10 together, the second sheet 222 extends along the first direction Z toward the first housing wall 102, and at least a portion of the flame-retardant structure 30 is disposed between the second sheet 222 and the housing 10.

[0128] Specifically, the second wall 202 of the second sheet 222 faces the housing 10 of the battery cell 100 , so that the flame retardant structure 30 faces the housing 10 of the battery cell 100 , and the first wall 201 of the second sheet 222 faces away from the housing 10 of the battery cell 100 .

[0129] By adopting the above-mentioned technical solution, in the multiple battery cells 100 arranged along the first direction Z, the first wall 201 can face away from the outer shell 10 of the battery cell 100, so that the orientations of the first walls 201 of the multiple battery cells 100 are roughly similar, which facilitates the welding operation of the busbar 300 to the electrode terminals 20 of two adjacent battery cells 100.

[0130] In addition, the flame-retardant structure 30 is arranged on the side of the second sheet 222 facing the outer shell 10, so that during the welding process, when the laser beam melts through the second sheet 222, the flame-retardant structure 30 can block the laser beam passing through the melting position of the second sheet 222, thereby improving the problem of the laser beam leaking to the battery cell 100, and further improving the problem of the laser beam leakage during the welding process causing the outer shell 10 of the battery cell 100 to be welded through or burned.

[0131] In some embodiments, referring to FIG. 3 and FIG. 4 , FIG. 7 and FIG. 8 , the second plate 222 is perpendicular to the second direction Y.

[0132] At least a portion of the second sheet 222 is located outside one end of the housing 10 along the second direction Y and is perpendicular to the second direction Y. Therefore, when there are multiple battery cells 100, the second sheets 222 of the multiple battery cells 100 can be parallel to each other and thus can be arranged flush. In other words, the first walls 201 of the multiple battery cells 100 can be parallel and flush with each other.

[0133] By adopting the above-mentioned technical solution, the second sheets 222 of multiple battery cells 100 can be parallel to each other, that is, the multiple second sheets 222 have the same orientation, and the first walls 201 of multiple battery cells 100 can be parallel to each other or even flush, so that it is convenient for the busbar 300 to be welded to the first walls 201 of two adjacent battery cells 100 respectively, and there is no need to bend the busbar 300 so that the busbar 300 can adapt to the first walls 201 of two adjacent battery cells 100. This helps to simplify the welding operation between the busbar 300 and the two adjacent electrode terminals 20, so as to simplify the series connection, parallel connection and mixed connection between multiple battery cells 100.

[0134] Figure 11 shows a partial schematic diagram of a battery 100 provided in some embodiments of the present application, and Figure 12 shows a partial enlarged view of Figure 11. In some embodiments, referring to Figures 11 and 12 together, a flame retardant structure 30 is also provided on the side of the first sheet 221 facing the second sheet 222.

[0135] The second sheet 222 extends along the first direction Z toward the first wall 102 of the housing 10 or away from the first wall 102 of the housing 10, such that one side of the second sheet 222 faces the first sheet 221. The second sheet 222 has the aforementioned second wall 202 on the side facing the first sheet 221, and the second wall 202 is provided with a flame-retardant structure 30. The first wall 201 is provided on the side of the second sheet 222 facing away from the first sheet 221. Accordingly, one side of the first sheet 221 faces the second sheet 222, and the side of the first sheet 221 facing the second sheet 222 also has a flame-retardant structure 30. The portion of the flame-retardant structure 30 on the second wall 202 is a first flame-retardant component 31, and the portion of the flame-retardant structure 30 on the side of the first sheet 221 facing the second sheet 222 is a second flame-retardant component 32.

[0136] By adopting the above-mentioned technical solution, the side of the first sheet 221 facing the second wall 202 of the second sheet 222 also has a flame retardant structure 30. In this way, when the laser beam leaks from the second wall 202 of the second sheet 222, the flame retardant structure 30 on the first sheet 221 can also block the laser beam. The first flame retardant component 31 and the second flame retardant component 32 can achieve a double blocking effect on the laser beam, so as to doubly improve the problem of the laser beam melting through the battery cell 100 or the adjacent battery cell 100.

[0137] In some embodiments, please refer to FIG. 11 and FIG. 12 , the first flame retardant member 31 and the second flame retardant member 32 are connected by bending.

[0138] For example, as shown in FIG11 and FIG12, when the first sheet 221 and the second sheet 222 are perpendicular, the first flame retardant 31 and the second flame retardant 32 are also perpendicular, so that the first flame retardant 31 and the second flame retardant 32 form an "L" shape.

[0139] Such a configuration, on the one hand, helps to position and fix the flame retardant structure 30 on the connecting piece 22 , and on the other hand, can provide the flame retardant structure 30 with a certain supporting effect, thereby maintaining the fixing effect of the flame retardant structure 30 on the connecting piece 22 .

[0140] In some embodiments, please refer to Figures 3 to 8 together. The housing 10 further has a second shell wall 103. The first shell wall 102 and the second shell wall 103 are opposite to each other along the first direction Z; the second shell wall 103 is provided with a groove 101, which is used to avoid the electrode terminal 20 of the battery cell 100 adjacent to the second shell wall 103.

[0141] The first shell wall 102 and the second shell wall 103 are both wall surfaces of the housing 10. The first shell wall 102 may be parallel to the second shell wall 103 or not. That is, the second shell wall 103 may be perpendicular to the first direction Z or not.

[0142] In some embodiments, referring to Figures 3 to 8 , the first shell wall 102 is the end cap 12 or a portion thereof, and the second shell wall 103 is a portion of the housing 11. In other embodiments, the first shell wall 102 is a portion of the housing 11. In still other embodiments, the second shell wall 103 is the end cap 12 or a portion thereof.

[0143] As shown in FIG. 3 and FIG. 4 , the second shell wall 103 is recessed substantially along the first direction Z to form the aforementioned groove 101 .

[0144] On the first shell wall 102, the projection of the groove 101 in the first direction Z covers at least a portion of the projection of the electrode terminal 20 in the first direction Z, so that the groove 101 and the electrode terminal 20 correspond in position along the first direction Z. Thus, when multiple battery cells 100 are generally distributed sequentially along the first direction Z, at least a portion of the electrode terminal 20 of one of two adjacent battery cells 100 can enter the groove 101 of the other battery cell 100 along the first direction Z. In this way, a large gap will not appear between the shells 10 of the two adjacent battery cells 100 due to the arrangement of the electrode terminals 20. This allows the two adjacent battery cells 100 to be closer to each other along the first direction Z, resulting in a more compact structure between the two adjacent battery cells 100.

[0145] In some embodiments, please refer to Figures 3 to 8 together. The groove 101 passes through one end of the shell 10 along the second direction Y, and the connecting piece 22 can extend to the outside of the shell 10 through the through-hole along the second direction Y, thereby facilitating the welding operation between the connecting piece 22 and the bus 300.

[0146] In some embodiments, referring to FIG. 3 and FIG. 4 , FIG. 7 and FIG. 8 , the housing 10 has a flange 13 , and the second piece 222 extends out of the flange 13 along the second direction Y.

[0147] As shown in Figures 3 and 4, Figures 7 and 8, the edges around the opening of the shell 11 of the housing 10 have a first flange, and the edges around the end cover 12 have a second flange. The first flange and the second flange are fixed by welding or the like to form a flange 13.

[0148] By adopting the above technical solution, the second sheet 222 is extended to the outside of the flange 13 along the second direction Y, thereby positioning the first wall 201 of the second sheet 222 outside one side of the flange 13 along the second direction Y. Based on this, when the busbar 300 is welded to the first wall 201 of the second sheet 222, the busbar 300 can be spaced apart from the flange 13 along the second direction Y. This prevents the busbar 300 from squeezing and damaging the flange 13. Furthermore, after the electrode terminal 20 and the busbar 300 are welded and fixed, the problem of the busbar 300 damaging the flange 13, which could cause the sealing of the housing 10 to deteriorate or even fail, can be alleviated.

[0149] In some embodiments, the first wall 201 has welding locations for welding to the busbar 300. The orthographic projection of the flame retardant structure 30 on the first wall 201 covers the welding locations.

[0150] The welding position of the first wall 201 is the specific location on the first wall 201 for welding to the busbar 300. It can be understood that after the busbar 300 is placed on the first wall 201 of the electrode terminal 20 and the laser beam is irradiated onto the busbar 300 and the electrode terminal 20, the heat generated by the laser beam diffuses at the welding position of the first wall 201, causing the welding position of the first wall 201 to melt to form a molten pool, which is then fixed to the busbar 300. In other words, the welding position of the first wall 201 is welded and fixed to the busbar 300.

[0151] The orthographic projection of the flame-retardant structure 30 on the first wall 201 refers to the projection of the flame-retardant structure 30 onto the first wall 201 along a direction perpendicular to the first wall 201 (direction Y). The orthographic projection of the flame-retardant structure 30 on the first wall 201 covers the welding position, which means that the position of the flame-retardant structure 30 along the direction perpendicular to the first wall 201 corresponds to the welding position.

[0152] By adopting the above-mentioned technical solution, when the laser beam is radiated to the welding position of the first wall 201 of the electrode terminal 20 to realize the welding of the electrode terminal 20 and the busbar 300, the flame retardant structure 30 covers the welding position, thereby better blocking the laser beam leaking from the welding position, thereby improving the problem of the battery cell 100 where the electrode terminal 20 is located or the adjacent battery cell 100 being welded through or burned due to the leakage of the laser beam.

[0153] In some embodiments, at least a portion of the flame-resistant structure 30 is fixed to the second wall 202 .

[0154] Such a configuration makes the position of the flame retardant structure 30 on the second wall 202 more stable and reliable, and facilitates the flame retardant structure 30 to block the laser beam, thereby improving the problem of the battery cell 100 being welded through.

[0155] In some embodiments, referring to FIG. 3 to FIG. 8 , the flame retardant structure 30 is bonded to the electrode terminal 20 .

[0156] In some embodiments, the first flame retardant member 31 of the flame retardant structure 30 is bonded to the second wall 202 . In some embodiments, the second flame retardant member 32 of the flame retardant structure 30 is bonded to the first sheet 221 of the electrode terminal 20 .

[0157] Specifically, an adhesive layer 40 is provided between the flame retardant structure 30 and the electrode terminal 20. The adhesive layer 40 may be a structural adhesive, a double-sided adhesive, or the like.

[0158] By adopting the above technical solution, when the flame retardant structure 30 is set on the electrode terminal 20, an adhesive layer 40 can be set on the flame retardant structure 30, and the side of the flame retardant structure 30 having the adhesive layer 40 is adhered to the electrode terminal 20. In this way, the fixing process of the flame retardant structure 30 on the electrode terminal 20 is very simple.

[0159] In some embodiments, the adhesive layer 40 for bonding the first flame retardant 31 to the second sheet 222 and the adhesive layer 40 for bonding the second flame retardant 32 to the first sheet 221 may be connected to each other, as shown in FIG. 12 , or may be spaced apart.

[0160] In some embodiments, the flame retardant structure 30 is a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, or a pre-oxidized silk aerogel.

[0161] That is, the material of the flame retardant structure 30 may be at least one of mica, ceramic, glass fiber, carbon fiber, carbon-carbon composite material, and pre-oxidized silk aerogel.

[0162] By adopting the above technical solution, the flame-retardant structure 30 is a high-temperature resistant structure with low thermal conductivity and high melting point, and has better flame-retardant properties. During the welding process, if the laser beam melts through the electrode terminal 20 and radiates to the flame-retardant structure 30, due to the low thermal conductivity and high melting point of the flame-retardant structure 30, the heat generated by the laser beam is difficult to diffuse inside the flame-retardant structure 30, making it difficult to melt through the flame-retardant structure 30. In this way, it is difficult for the laser beam to leak through the flame-retardant structure 30, so that the flame-retardant structure 30 has an excellent effect of blocking the laser beam, thereby effectively achieving a protective effect on the battery cell 100 where the flame-retardant structure 30 is located or the adjacent battery cell 100.

[0163] In some embodiments, the thermal conductivity of the flame retardant structure 30 is ≤ 0.7 W / m·K (W / m . Spend).

[0164] For example, the thermal conductivity of the flame retardant structure 30 may be 0.7 W / m·K, 0.65 W / m·K, 0.6 W / m·K, 0.55 W / m·K, 0.5 W / m·K, or the like.

[0165] By configuring the flame-retardant structure 30 to have a low thermal conductivity, the flame-retardant structure 30 can have a weaker thermal conductivity. During welding, if the laser beam melts through the electrode terminal 20 and radiates to the flame-retardant structure 30, the flame-retardant structure 30's low thermal conductivity makes it difficult for the heat generated by the laser beam to diffuse within the flame-retardant structure 30, making it difficult to melt through the flame-retardant structure 30. This makes it difficult for the laser beam to leak through the flame-retardant structure 30, making the flame-retardant structure 30 more effective in blocking the laser beam, thereby effectively protecting the battery cell 100 in which the flame-retardant structure 30 is located or adjacent battery cells 100.

[0166] In some embodiments, the melting point of the flame retardant structure 30 is greater than 800°C.

[0167] For example, the melting point of the flame retardant structure 30 may be 800° C., 810° C., 820° C., 830° C., 850° C., 900° C., 950° C., 1000° C., etc.

[0168] By configuring the flame-retardant structure 30 to have a relatively high melting point, during the welding process, if the laser beam melts through the electrode terminal 20 and radiates to the flame-retardant structure 30, the flame-retardant structure 30 is unlikely to melt under the laser beam's radiation due to its relatively high melting point. In other words, the laser beam is unlikely to penetrate the flame-retardant structure 30. This makes it difficult for the laser beam to leak through the flame-retardant structure 30, effectively blocking the laser beam and thus effectively protecting the battery cell 100 where the flame-retardant structure 30 is located or adjacent battery cells 100.

[0169] Based on the above concept, please refer to Figures 2, 5 to 8 together. A second aspect of the present application provides a battery 1000, which includes a busbar 300 and a plurality of battery cells 100. The battery cells 100 provided in this embodiment are the same as the battery cells 100 provided in the above embodiment. For details, please refer to the description of the battery cells 100 in the above embodiment, and will not be repeated here.

[0170] Specifically, the first walls 201 of the electrode terminals 20 of two adjacent battery cells 100 are welded to the busbar 300 to achieve series connection or parallel connection through the busbar 300 , thereby achieving series connection, parallel connection or mixed connection between multiple battery cells 100 .

[0171] The battery 1000 provided in the embodiment of the present application adopts the battery cell 100 involved in the above-mentioned embodiment. Therefore, when the electrode terminals 20 of two adjacent battery cells 100 are welded to the busbar 300, the problem of laser beam leakage during the welding process causing the battery cells 100 to be welded through or burned can be improved, thereby ensuring that the battery 1000 has higher quality.

[0172] Based on the above concept, referring to FIG1 , a third aspect of an embodiment of the present application provides an electrical device, which includes a battery cell 100 or a battery 1000. The battery cell 100 provided in this embodiment is the same as the battery cell 100 provided in the above embodiment, and for details, reference may be made to the description of the battery cell 100 in the above embodiment. The battery 1000 provided in this embodiment is the same as the battery 1000 provided in the above embodiment, and for details, reference may be made to the description of the battery 1000 in the above embodiment, and will not be repeated here.

[0173] The electrical device provided in the embodiment of the present application, due to the use of the battery cell 100 or battery 1000 involved in the above-mentioned embodiment, can also improve the problem of laser beam leakage during welding causing the battery cell 100 to be welded through or burned, thereby making the battery cell 100 have higher quality, and thus making the electrical device also have higher quality.

[0174] As one of the embodiments of the present application, as shown in Figures 3 to 8 , a battery cell 100 includes a housing 10, an electrode terminal 20, and a flame-retardant structure 30. The electrode terminal 20 includes a pole 21 and a connecting piece 22. The connecting piece 22 includes a first piece 221 and a second piece 222. The second piece 222 is perpendicular to the first piece 221 and connected to the first piece 221. The housing 10 has a first shell wall 102 and a second shell wall 103 on opposite sides along a first direction Z. The pole 21 is disposed on the first shell wall 102, and the second shell wall 103 defines a groove 101. The first shell 221 is connected to the pole 21. The second shell 222 has a first wall 201 and a second wall 202 on opposite sides along the thickness direction. The first flame-retardant component 31 of the flame-retardant structure 30 is disposed on the second wall 202 of the second piece 222. The second flame-retardant component 32 of the flame-retardant structure 30 is disposed on the side of the first piece 221 facing the second piece 222. Furthermore, at least a portion of the second piece 222 extends beyond the first shell wall 102 of the housing 10 along the second direction Y.

[0175] When multiple battery cells 100 are distributed in sequence along the first direction Z, in two adjacent battery cells 100, at least a portion of the electrode terminal 20 of the first battery cell 100a extends into the groove 101 of the second battery cell 100b along the first direction Z, the first flame retardant component 31 of the first battery cell 100a is opposite to the second battery cell 100b, and the first wall 201 of the first battery cell 100a is flush with the first wall 201 of the second battery cell 100b.

[0176] Based on this, when the busbar 300 is welded to the electrode terminals 20 of two adjacent battery cells 100, the busbar 300 can be disposed on the first walls 201 of two adjacent second sheets 222 and welded to the two second sheets 222. If the laser beam leaks during the welding process, the flame-retardant structure 30 can block the laser beam, thereby preventing the laser beam from leaking to adjacent battery cells 100.

[0177] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A battery cell (100), wherein: include: Housing (10); An electrode terminal (20) is arranged on the housing (10); the electrode terminal (20) has a first wall (201) and a second wall (202) opposite to each other, and the first wall (201) is used for welding with the busbar (300); The flame retardant structure (30) is at least partially located on a side of the second wall (202) away from the first wall (201).

2. The battery cell (100) according to claim 1, wherein: The electrode terminal (20) comprises a pole (21) and a connecting piece (22) connected to the pole (21); the pole (21) is arranged on the housing (10); and the first wall (201) and the second wall (202) are respectively arranged on opposite sides of the connecting piece (22).

3. The battery cell (100) according to claim 2, wherein: The connecting sheet (22) comprises a first sheet (221) and a second sheet (222) bent and connected to the first sheet (221); the first sheet (221) is connected to the pole (21); the first wall (201) and the second wall (202) are respectively arranged on opposite sides of the second sheet (221).

4. The battery cell (100) according to claim 3, wherein: The housing (10) has a first housing wall (102) along a first direction (Z), the pole (21) is arranged on the first housing wall (102), at least a portion of the second sheet (222) is located outside one end of the first housing wall (102) along a second direction (Y), the first direction (Z) and the second direction (Y) intersect, and the first direction (Z) is perpendicular to the first housing wall (102).

5. The battery cell (100) according to claim 4, wherein: The second sheet (222) is extended along the first direction (Z) and is disposed away from the first shell wall (102), and the flame retardant structure (30) is used to face the battery cell (100) adjacent to the first shell wall (102).

6. The battery cell (100) according to claim 4, wherein: The second sheet (222) is extended along the first direction (Z) toward the first shell wall (102), and at least a portion of the flame retardant structure (30) is disposed between the second sheet (222) and the shell (10).

7. The battery cell (100) according to any one of claims 3 to 6, wherein: The flame retardant structure (30) is provided on a side of the first sheet (221) facing the second sheet (222).

8. The battery cell (100) according to any one of claims 4 to 6, wherein: The housing (10) further comprises a second housing wall (103), wherein the first housing wall (102) and the second housing wall (103) are opposite to each other along the first direction (Z); the second housing wall (103) is provided with a groove (101), and the groove (101) is used to avoid the electrode terminal (20) of the battery cell (100) adjacent to the second housing wall (103).

9. The battery cell (100) according to any one of claims 1 to 8, wherein: The first wall (201) has a welding position for welding with the busbar (300), and the orthographic projection of the flame retardant structure (30) on the first wall (201) covers the welding position.

10. The battery cell (100) according to any one of claims 1 to 9, wherein: At least a portion of the flame retardant structure (30) is fixed to the second wall (202).

11. The battery cell (100) according to any one of claims 1 to 10, wherein: The flame retardant structure (30) is a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material piece, or a pre-oxidized silk aerogel piece.

12. The battery cell (100) according to any one of claims 1 to 11, wherein: The thermal conductivity of the flame retardant structure (30) is ≤0.7 W / m·K; and / or the melting point of the flame retardant structure (30) is greater than 800°C.

13. A battery (1000), wherein: include: Busbar (300); A plurality of battery cells (100) according to any one of claims 1 to 12, wherein the first wall (201) of the electrode terminal (20) of two adjacent battery cells (100) is welded to the busbar (300).

14. An electrical device, wherein: It comprises the battery cell (100) according to any one of claims 1 to 12, or it comprises the battery (1000) according to claim 13.

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