Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, and the battery monomer comprises a shell which is provided with an electrode terminal; the electrode assembly is arranged in the shell and comprises a main body part and a tab part connected to at least one side of the main body part, and the main body part and the tab part are arranged in a preset direction; the tab part comprises a plurality of layers of tab pieces which are arranged in a laminated manner and at least two welding marks, and the welding marks are arranged at intervals along a preset direction; the welding marks are connected between the electrode lug pieces in the stacking direction, and the electrode lug part is bent along at least one welding mark and used for being connected with an electrode terminal. The at least two welding marks are arranged on the tab part, so that the welding stability of the tab can be improved; therefore, on one hand, the at least two welding marks can effectively improve the welding stability of the tab part, and on the other hand, while the tab part folds the tab along one of the welding marks, the other welding marks fix the tab part, so that the structure of the tab part is more compact, and the utilization rate of the tab folding space is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0002] Electrode assemblies are crucial structures within battery cells where electrochemical reactions occur. They are typically composed of stacked and wound positive electrode plates, separators, and negative electrode plates, forming the main body and tabs. As the energy density requirements of battery cells increase, the number of layers in the positive electrode plate, separator, and negative electrode plate within the electrode assembly increases. This leads to an increase in the thickness and height of the tabs.

[0003] Therefore, for battery cells with large thickness and height of tabs, problems such as poor tab welding and insufficient space for tab folding are likely to occur, affecting the performance of the battery cells. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, battery device, and electrical equipment to address the problems that arise from the increased thickness and height of the tabs in current battery cells, which can easily lead to poor welding of the tabs and insufficient space for folding the tabs.

[0005] In a first aspect, this application provides a battery cell, including a housing and an electrode assembly. The housing is provided with electrode terminals. The electrode assembly is disposed inside the housing and includes a main body and a tab connected to at least one side of the main body. The main body and the tab are arranged along a predetermined direction. The tab includes multiple layers of tab sheets stacked together and at least two solder marks, each solder mark being spaced apart along a predetermined direction. Each solder mark is connected between the layers of tab sheets along the stacking direction. The tab is bent along at least one solder mark for connection to the electrode terminals.

[0006] With the above structure, on the one hand, at least two solder marks can effectively improve the welding stability of the electrode lug; on the other hand, while the electrode lug is folded along one of the solder marks, the other solder marks fix the electrode lug, making the structure of the electrode lug more compact and improving the utilization rate of the folded electrode lug space.

[0007] In some embodiments, the solder mark includes a first solder mark and a second solder mark, wherein the first solder mark is located between the second solder mark and the main body portion along a preset direction; wherein the electrode portion is bent along the second solder mark.

[0008] Therefore, the above structure can further reduce the thickness of the overlapping part after the tab is bent, effectively increasing the tab folding space.

[0009] In some embodiments, the tab portion includes a contour region and a gradient region, the contour region being connected between the gradient region and the main body portion; in the thickness direction of the electrode assembly, the thickness of the gradient region gradually decreases from one end connected to the contour region to the other end; wherein at least a portion of the first solder mark is located in the contour region, and the second solder mark is located in the gradient region.

[0010] Thus, the above structure not only better gathers the contour zone and gradient zone, making the welding of the electrode lug more stable, but also effectively reduces the thickness of the overlapping part when the electrode lug is bent, further increasing the electrode lug space.

[0011] In some embodiments, in a preset direction, the center line of the second solder mark is located at the halfway point of the gradient zone.

[0012] Thus, when the tab is bent along the second solder mark, the gradient areas on the left and right sides of the second solder mark overlap, which can keep the number of layers unchanged after the overlap and effectively increase the space for bending the tab.

[0013] In some embodiments, in a preset direction, the distance between the first solder mark and the end face of the main body is Z, and the height of the electrode tab is H, wherein Z≤1 / 2H.

[0014] Therefore, by setting the relationship between the distance between the first solder mark and the end face of the main body and the height of the electrode tab within the above range, the welding stability of the electrode tab can be improved.

[0015] In some embodiments, the width of the first solder mark and / or the second solder mark is W in the width direction of the electrode assembly, and the width of the tab is L, wherein 2mm≤W≤L.

[0016] Therefore, by setting the relationship between the width of the first solder mark and / or the second solder mark and the width of the electrode lug within the above-mentioned range, the first solder mark and the second solder mark can better fix the electrode lug.

[0017] In some embodiments, in the width direction, the distance between the opposite ends of the first solder mark and / or the second solder mark and the edge of the electrode tab is s, where 1mm≤s≤10mm.

[0018] Based on this, by setting the distance between the opposite ends of the first and / or second solder marks and the edge of the electrode lug within the aforementioned range, the welding stability of the electrode lug can be effectively improved, and the probability of side redundancy after the electrode lug is bent can be effectively reduced.

[0019] In some embodiments, the tab includes multiple layers of electrode sheets stacked along the thickness direction of the electrode assembly, and the total number of electrode sheets in the tab is y; in a preset direction, the difference in the number of electrode sheets between the center position of the first solder mark and the center position of the second solder mark is x, and 1 / 3y≤x≤2 / 3y.

[0020] In this way, when folding the tabs along the second solder mark, the probability of poor folding and poor welding can be effectively reduced.

[0021] In some embodiments, each solder mark extends continuously along the width direction of the electrode assembly. Thus, this structure effectively reduces the probability of lateral redundancy after the tab is bent.

[0022] In some embodiments, each solder mark includes multiple sub-solder areas, which are spaced apart along the width direction of the electrode assembly. Thus, with this structure, the energy in each sub-solder area is more concentrated, which can better reduce the probability of electrode tab cracking.

[0023] In some embodiments, a portion of the solder marks extends continuously along the width direction of the electrode assembly, while the remaining solder marks include multiple sub-soldering areas, which are spaced apart along the width direction of the electrode assembly. This structure makes the structure of each solder mark more stable, thereby making the structure of the tab and the tab folding process more stable.

[0024] Secondly, this application also provides a battery device, including the battery cell as described above.

[0025] Thirdly, this application also provides an electrical device, including the battery device described above.

[0026] The aforementioned battery cell, battery device, and electrical equipment have at least two solder marks on the tab, and each solder mark is spaced apart from the other along a predetermined direction. In this way, multiple solder marks can improve the welding stability of the tab. In addition, the tab can be bent along one of the solder marks and then connected to the electrode terminal on the casing, which is called a folded tab. In this way, on the one hand, at least two solder marks can effectively improve the welding stability of the tab, and on the other hand, while the tab is folded along one of the solder marks, the other solder marks fix the tab, making the structure of the tab more compact and improving the utilization rate of the folded tab space. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0028] Figure 2 This is an exploded structural diagram of a battery according to one or more embodiments.

[0029] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0030] Figure 4 This is a schematic diagram of an electrode assembly according to one or more embodiments.

[0031] Figure 5 This is a schematic diagram of the connection between the tab and the electrode terminal according to one or more embodiments.

[0032] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0033] Figure 7 This is a side view of an electrode assembly according to one or more embodiments.

[0034] Figure 8 This is a side view of an electrode assembly with its tabs folded back according to one or more embodiments.

[0035] Figure 9 This is a schematic diagram of an electrode assembly according to one or more embodiments.

[0036] Explanation of reference numerals in the attached drawings: 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 20, battery cell; 11, first part; 12, second part; 21, top cover; 22, shell body; 23, electrode assembly; 231, main body; 232, electrode tab; 233, first solder mark; 234, second solder mark; 235, sub-soldering area; 2321, contour area; 2322, gradient area; a, preset direction; b, thickness direction; c, width direction. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0043] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0044] A battery device consists of one or more battery cells. For each battery device, the multiple battery cells that make up it can be connected in series, in parallel, or in a mixed configuration. Among them, a mixed configuration means that multiple battery cells are connected in both series and parallel.

[0045] A battery cell is the smallest unit that makes up a battery. The structure of a battery cell typically includes a casing and an electrode assembly housed inside the casing. The casing forms a closed, sealed cavity that houses and protects the electrode assembly. The electrode assembly is the component in the battery cell where the electrochemical reaction occurs, and typically includes a positive electrode, a negative electrode, and a separator, which are stacked or wound together.

[0046] For electrode assemblies, the portion of the positive or negative electrode coated with active material constitutes the main body of the assembly, while the portion without active material coating forms the tab. With the rapid development of new energy technologies, the performance requirements for individual battery cells are becoming increasingly stringent, leading to a corresponding increase in the number of layers in the positive electrode, separator, and negative electrode assembly. This results in an increase in both the thickness and height of the tab.

[0047] For battery cells with large thickness and height of tabs, problems such as poor tab welding and insufficient space for tab folding are likely to occur, affecting the performance of the battery cell.

[0048] Based on the above considerations, in order to address the problems of poor welding and insufficient space for folding the tabs caused by the increased thickness and height of the tabs in current battery cells, one or more embodiments of this application provide a battery cell with at least two solder marks on the tabs, spaced apart from each other along a predetermined direction. This multiple solder marks improve the welding stability of the tabs. Furthermore, the tabs can be bent along at least one of the solder marks and then connected to the electrode terminals on the casing. In this way, on the one hand, at least two solder marks effectively improve the welding stability of the tabs; on the other hand, while the tabs are folded along one solder mark, the other solder marks fix the tabs, making the tab structure more compact and improving the utilization rate of the folding space.

[0049] It should be noted that the battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0050] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0051] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0052] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0053] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0054] The battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft.

[0055] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0056] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0057] Please refer to Figure 1 The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

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

[0059] Please refer to Figure 2 The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, collectively defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the space. Alternatively, both the first portion 11 and the second portion 12 may be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0061] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0062] Please refer to Figure 3A battery cell 20 refers to the smallest unit that makes up a battery. A battery cell 20 typically includes a casing, an electrode assembly 23, and other functional components. The casing includes a top cover 21 and a casing body 22. The top cover 21 is a component that closes onto the opening of the casing body 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the top cover 21 may be adapted to the shape of the casing body 22 to fit it. Functional components such as electrode terminals may be provided on the top cover 21; these electrode terminals are also called terminals. The electrode terminals can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the top cover 21 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In some embodiments, an insulating member may be provided inside the top cover 21. This insulating member can be used to isolate the electrical connection components within the casing body 22 from the top cover 21 to reduce the risk of short circuits. Exemplarily, the insulating member may be made of plastic, rubber, etc.

[0063] The casing body 22 is a component used to cooperate with the top cover 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The casing body 22 and the top cover 21 can be independent components. An opening can be provided on the casing body 22, and the top cover 21 can close the opening to form the internal environment of the battery cell 20. Alternatively, the top cover 21 and the casing body 22 can be integrated. Specifically, the top cover 21 and the casing body 22 can form a common connecting surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the casing body 22, the top cover 21 closes the casing body 22. The casing body 22 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the casing body 22 can be determined according to the specific shape and size of the electrode assembly 23.

[0064] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. Electrode assembly 23 mainly consists of a positive electrode, a separator, and a negative electrode. Specifically, positive and negative active materials are coated onto the current collector to form the positive and negative electrode, respectively. The positive and negative electrode are wound or stacked, with the separator positioned between them, thus forming electrode assembly 23. The portions of the positive and negative electrode with active material constitute the main body of electrode assembly 23, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0065] Please refer to the following: Figure 3 and Figure 4 One embodiment of this application provides a battery cell 20, including a housing and an electrode assembly 23. The housing has electrode terminals (not shown in the figure). The electrode assembly 23 is disposed within the housing and includes a main body 231 and a tab 232 connected to at least one side of the main body 231. The main body 231 and the tab 232 are arranged along a predetermined direction a. The tab 232 includes multiple layers of tabs stacked together and at least two solder marks, which are spaced apart along the predetermined direction a. Each solder mark connects between the layers of tabs along the stacking direction, and the tab 232 is bent along at least one solder mark for connection to the electrode terminals.

[0066] It should be noted that the housing refers to the structure that encloses and forms a cavity for accommodating the electrode assembly 23 and provides protection for the electrode assembly 23. The housing can be assembled from the top cover 21 and the housing body 22, or it can be integrally formed.

[0067] Electrode terminals are components used for electrical connection with electrode assembly 23 to realize the output and input of power of battery cell 20. Electrode terminals can usually be set on top cover 21, but can also be set on other side walls of the housing according to actual needs.

[0068] The electrode assembly 23 is disposed within the housing. To better accommodate the electrode assembly 23 within the housing, its shape is typically designed to match the shape of the housing. It should be noted that the main body 231 and the tabs 232 are arranged along a predetermined direction a. The tabs 232 can be connected to one side of the main body 231 along the predetermined direction a, or they can be connected to opposite sides of the main body 231 along the predetermined direction a. After the electrode assembly 23 is placed in the housing, the predetermined direction a is the height direction of the battery cell 20, the thickness direction b of the electrode assembly 23 is the thickness direction b of the battery cell 20, and the width direction c of the electrode assembly 23 is the width direction c of the battery cell 20.

[0069] Furthermore, the battery cell 20 typically includes two large surfaces, two side surfaces, a top surface, and a bottom surface, with the large surface referring to the surface with the largest area. The two large surfaces are parallel to each other, the two side surfaces are parallel to each other, and the top and bottom surfaces are parallel to each other. The height direction refers to the direction perpendicular to the top and bottom surfaces, the thickness direction b refers to the direction perpendicular to the large surface, and the width direction c refers to the direction perpendicular to the side surfaces.

[0070] The electrode assembly 23 includes a main body 231 and an electrode tab 232. The electrode tab 232 is connected to at least one side of the main body 231 so that the electrode tab 232 is electrically connected to an electrode terminal on the top or bottom surface.

[0071] Understandably, the tab 232 can be connected to one side of the main body 231 along the height direction of the electrode assembly 23, i.e., one end of the tab is connected to the opposite sides of the main body 231 along the height direction of the electrode assembly 23, i.e., both ends of the tab are connected to the tab.

[0072] When the electrode assembly 23 is placed inside the housing, the tab 232 needs to be electrically connected to the electrode terminals on the housing. Since the internal space of the housing is limited, the tab 232 typically needs to be bent and connected to the electrode terminals. However, the electrode assembly 23 is usually formed by stacking and winding multiple layers of positive electrode sheets, separators, and negative electrode sheets. Therefore, the tab 232 typically includes multiple layers of positive electrode sheets, separators, and negative electrode sheets. Thus, solder marks need to be applied to the tab 232 to secure it.

[0073] As the thickness and height of the tab portion 232 increase, problems such as poor welding are prone to occur after the tab portion 232 is bent. Based on this, this application provides at least two solder marks on the tab portion 232, and each solder mark is spaced apart from each other along a predetermined direction a. In this way, multiple solder marks can work together to fix the multi-layered tab pieces stacked in the tab portion 232, so that the tab pieces are stably connected and the welding stability of the tab portion 232 is improved.

[0074] Furthermore, when bending the tab, the tab portion 232 can be bent along at least one solder mark and then electrically connected to the electrode terminal. During the bending process, the remaining solder marks can fix the tab portion 232 in place.

[0075] Thus, through the above structure, on the one hand, at least two solder marks can effectively improve the welding stability of the tab portion 232; on the other hand, while the tab portion 232 folds along at least one solder mark, the other solder marks fix the tab portion 232, making the structure of the tab portion 232 more compact and improving the utilization rate of the folding tab space.

[0076] like Figure 5 and Figure 6 As shown, in some embodiments, the solder mark includes a first solder mark 233 and a second solder mark 234, with the first solder mark 233 located between the second solder mark 234 and the main body portion 231 along a predetermined direction a. The tab portion 232 is bent along the second solder mark 234.

[0077] Specifically, a first solder mark 233 and a second solder mark 234 are respectively provided on the tab portion 232, and the first solder mark 233 is located between the second solder mark 234 and the main body portion 231 along a preset direction a. That is, in the preset direction a, the first solder mark 233 is closer to the main body portion 231, and the second solder mark 234 is farther away from the main body portion 231 than the first solder mark 233.

[0078] It should be noted that the thickness of the tab portion 232 typically decreases gradually from the end connected to the main body portion 231 towards the end away from the main body portion 231. Therefore, by bending the tab portion 232 along the second solder mark 234, the thickness at the position of the second solder mark 234 is often smaller than the thickness at the position of the first solder mark 233. In this way, the thickness of the overlapping portion after bending the tab can be effectively reduced, further reducing the space occupied by the bent tab.

[0079] Therefore, the thickness of the overlapping portion after the tab 232 is bent can be further reduced through the above structure, effectively increasing the tab folding space.

[0080] like Figure 7 and Figure 8 As shown, in some embodiments, the tab portion 232 includes a contour region 2321 and a gradient region 2322, with the contour region 2321 connecting the gradient region 2322 and the main body portion 231. In the thickness direction b of the electrode assembly 23, the thickness of the gradient region 2322 gradually decreases from the end connected to the contour region 2321 to the other end. At least a portion of the first solder mark 233 is located in the contour region 2321, and the second solder mark 234 is located in the gradient region 2322.

[0081] Specifically, the contour zone 2321 connects the gradient zone 2322 and the main body 231, and the thickness of the contour zone 2321 remains consistent. The thickness of the gradient zone 2322 gradually decreases from the end connected to the contour zone 2321 to the other end.

[0082] At least a portion of the first solder mark 233 is located in the contour zone 2321. Specifically, the first solder mark 233 may be completely located in the contour zone 2321, or a portion of the first solder mark 233 may be located in the contour zone 2321 and another portion may be located in the gradient zone 2322. That is, the first solder mark 233 is located at the boundary between the contour zone 2321 and the gradient zone 2322.

[0083] In this way, the first solder mark 233 can better converge the contour area 2321 and the gradient area 2322, making the welding of the tab 232 more stable.

[0084] Furthermore, the second solder mark 234 is located in the gradient region 2322, so that when the tab 232 bends along the second solder mark 234, the thickness of the overlapping part can be effectively reduced.

[0085] Thus, the above structure not only better gathers the contour zone 2321 and the gradient zone 2322, making the welding of the tab 232 more stable, but also effectively reduces the thickness of the overlapping part when the tab 232 is bent, further improving the tab bending space.

[0086] In some embodiments, in the preset direction a, the center line of the second solder mark 234 is located at the halfway point of the gradient region 2322.

[0087] Specifically, the center line of the second solder mark 234 is set at the half position of the gradient area 2322. When the tab 232 bends along the second solder mark 234, the gradient areas 2322 on the left and right sides of the second solder mark 234 overlap, which can keep the number of layers unchanged after the overlap and effectively increase the tab folding space.

[0088] In some embodiments, in a preset direction a, the distance between the first solder mark 233 and the end face of the main body 231 is Z, and the height of the tab 232 is H, wherein Z≤1 / 2H.

[0089] Specifically, in the preset direction a, the relationship between the distance between the first solder mark 233 and the end face of the main body 231 and the height of the tab 232 will affect the overall welding stability of the tab 232.

[0090] Therefore, by setting the relationship between the distance between the first solder mark 233 and the end face of the main body 231 and the height of the tab 232 within the above range, the welding stability of the tab 232 can be better improved.

[0091] like Figure 4 As shown, in some embodiments, the width of the first solder mark 233 and / or the second solder mark 234 in the width direction c of the electrode assembly 23 is W, and the width of the tab 232 is L, wherein 2mm≤W≤L.

[0092] Specifically, the width of the first solder mark 233 can be set to be equal to the width of the second solder mark 234. The widths of the first solder mark 233 and the second solder mark 234 affect the strength of the welding of the tab portion 232.

[0093] Therefore, by setting the relationship between the width of the first solder mark 233 and / or the second solder mark 234 and the width of the tab 232 within the above range, the first solder mark 233 and the second solder mark 234 can better fix the tab 232.

[0094] In some embodiments, in the width direction c, the distance between the opposite ends of the first solder mark 233 and / or the second solder mark 234 and the edge of the tab portion 232 is s, where 1mm≤s≤10mm.

[0095] Specifically, the edges of the first solder mark 233 and the second solder mark 234 do not extend to the edge of the tab 232, but are at a certain distance from it. If this distance is too large, the solder mark area will be smaller, affecting the welding stability; if this distance is too small, it will easily lead to side redundancy after the tab 232 is bent.

[0096] Based on this, the distance between the two ends of the first solder mark 233 and / or the second solder mark 234 and the edge of the tab 232 is set within the above range. This effectively improves the welding stability of the tab 232 and reduces the probability of side redundancy after the tab 232 is bent.

[0097] In some embodiments, the tab 232 includes multiple layers of electrodes stacked along the thickness direction b of the electrode assembly 23, and the total number of electrode layers in the tab 232 is y. In a preset direction a, the difference in the number of electrode layers between the center position of the first solder mark 233 and the center position of the second solder mark 234 is x, where 1 / 3y ≤ x ≤ 2 / 3y.

[0098] Specifically, in the preset direction a, the center position of the first solder mark 233 refers to the center line of the first solder mark 233. The center position of the second solder mark 234 refers to the center line of the second solder mark 234. The difference in the number of electrode layers between the center line of the first solder mark 233 and the center line of the second solder mark 234 is x, and the total number of electrode layers in the tab portion 232 is y, where 1 / 3y≤x≤2 / 3y.

[0099] Thus, when folding the tabs along the second solder mark 234, the probability of poor folding and poor welding can be effectively reduced.

[0100] In some embodiments, each solder mark extends continuously along the width direction c of the electrode assembly 23.

[0101] Specifically, each solder mark is continuously extended along the width direction c and centered on the tab 232, so that each solder mark better covers the tab 232.

[0102] When the first solder mark 233 and the second solder mark 234 are provided, both the first solder mark 233 and the second solder mark 234 extend continuously along the width direction c and cover the electrode tab 232 in the center.

[0103] Thus, the above structure can effectively reduce the probability of redundancy on the side after the tab 232 is bent.

[0104] like Figure 9 As shown, in some embodiments, each solder mark includes a plurality of sub-solder areas 235, and the sub-solder areas 235 are arranged at intervals along the width direction c of the electrode assembly 23.

[0105] Specifically, each solder mark can also be set as multiple sub-soldering areas 235, and each sub-soldering area 235 is arranged at intervals along the width direction c.

[0106] When the solder marks are set as first solder mark 233 and second solder mark 234, both first solder mark 233 and second solder mark 234 can include multiple sub-solder areas 235 arranged at intervals along the width direction c.

[0107] Therefore, through the above structure, the energy of each sub-welding area 235 is more concentrated, which can better reduce the probability of cracking of the tab 232.

[0108] In some embodiments, of all solder marks, a portion of the solder marks extends continuously along the width direction c of the electrode assembly 23, and the remaining portion of the solder marks includes a plurality of sub-soldering areas 235, each sub-soldering area 235 being arranged at intervals along the width direction c of the electrode assembly 23.

[0109] Specifically, of all the solder marks, a portion of the solder marks can be set as continuously extending solder marks, while another portion of the solder marks can be set as multiple spaced sub-soldering areas 235.

[0110] When the solder marks are configured as a first solder mark 233 and a second solder mark 234, the first solder mark 233 can be configured as a continuously extending long solder mark, while the second solder mark 234 can be configured as spaced-apart sub-soldering areas 235. Alternatively, the second solder mark 234 can be configured as a continuously extending long solder mark, while the first solder mark 233 can be configured as spaced-apart sub-soldering areas 235. The specific structure and quantity of the solder marks can be adjusted according to actual needs, and will not be elaborated upon here.

[0111] The above structure makes the structure of each solder mark more stable, thereby making the structure of the tab 232 and the process of folding the tab more stable.

[0112] Based on the same concept as the battery cell 20 described above, this application also provides a battery device 100, including the battery cell 20 as described above.

[0113] Based on the same concept as the battery device 100 described above, this application also provides an electrical device including the battery device 100 as described above.

[0114] According to one or more embodiments, when this application is used, firstly, a first solder mark 233 and a second solder mark 234 are soldered on the tab portion 232, and the first solder mark 233 and the second solder mark 234 are spaced apart along a preset direction a. The first solder mark 233 is set in the equal height area 2321 of the tab portion 232 or at the junction of the equal height area 2321 and the gradient area 2322, and the second solder mark 234 is set in the gradient area 2322.

[0115] The first solder mark 233 can fix the tab 232. At the same time, the tab 232 can be bent along the second solder mark 234, that is, the tab is bent, so as to electrically connect the tab 232 to the electrode terminal and realize the assembly of the battery cell 20.

[0116] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery cell, characterized in that, include: A housing, wherein the housing is provided with electrode terminals; An electrode assembly is disposed within the housing and includes a main body and an electrode tab connected to at least one side of the main body. The main body and the electrode tab are arranged along a preset direction. The electrode tab includes multiple layers of electrode tabs stacked together and at least two solder marks, each of which is spaced apart along the preset direction. The solder marks are connected between the tabs in each layer along the stacking direction, and the tabs are bent along at least one solder mark for connection to the electrode terminal.

2. The battery cell according to claim 1, characterized in that, The solder mark includes a first solder mark and a second solder mark, wherein the first solder mark is located between the second solder mark and the main body portion along the preset direction; The tab portion is bent along the second solder mark.

3. The battery cell according to claim 2, characterized in that, The electrode portion includes a constant height region and a gradient region, the constant height region being connected between the gradient region and the main body portion; in the thickness direction of the electrode assembly, the thickness of the gradient region gradually decreases from one end connected to the constant height region to the other end; Wherein, at least a portion of the first solder mark is located in the contour zone, and the second solder mark is located in the gradient zone.

4. The battery cell according to claim 3, characterized in that, In the preset direction, the center line of the second solder mark is located at the halfway point of the gradient zone.

5. The battery cell according to claim 2, characterized in that, In the preset direction, the distance between the first solder mark and the end face of the main body is Z, and the height of the electrode tab is H, where Z≤1 / 2H.

6. The battery cell according to claim 2, characterized in that, In the width direction of the electrode assembly, the width of the first solder mark and / or the second solder mark is W, and the width of the electrode tab is L, wherein 2mm≤W≤L.

7. The battery cell according to claim 6, characterized in that, In the width direction, the distance between the opposite ends of the first solder mark and / or the second solder mark and the edge of the electrode tab is s, where 1mm≤s≤10mm.

8. The battery cell according to claim 2, characterized in that, The tab portion includes multiple layers of electrode sheets stacked along the thickness direction of the electrode assembly, and the total number of electrode sheets in the tab portion is y; in the preset direction, the difference in the number of electrode sheets between the center position of the first solder mark and the center position of the second solder mark is x, and 1 / 3y≤x≤2 / 3y.

9. The battery cell according to any one of claims 1-8, characterized in that, Each of the solder marks extends continuously along the width direction of the electrode assembly.

10. The battery cell according to any one of claims 1-8, characterized in that, Each of the solder marks includes multiple sub-soldering areas, and the sub-soldering areas are arranged at intervals along the width direction of the electrode assembly.

11. The battery cell according to any one of claims 1-8, characterized in that, Of all the solder marks, some of the solder marks extend continuously along the width direction of the electrode assembly, and the remaining solder marks include multiple sub-soldering areas, each of which is spaced apart along the width direction of the electrode assembly.

12. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-11.

13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12.

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