Welding device, battery monomer, battery device and electric equipment
By using a multi-tooth high-welding head in the welding device to simultaneously weld the equal height zone and gradient zone of the electrode lug, the problems of low welding efficiency and unstable quality are solved, and a highly efficient and stable multi-welding effect is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-19
- Publication Date
- 2026-04-03
AI Technical Summary
In existing technologies, the production efficiency of welding tabs is low and the welding quality is difficult to control. In particular, as the energy density of battery cells increases, the thickness of the tabs increases, leading to frequent problems of poor welding and incomplete welding.
A welding device is used, which includes at least two welding heads, each with welding teeth of different heights, enabling simultaneous welding in the equal height zone and gradient zone of the electrode tab to form multiple weld marks, matching different thickness areas of the electrode tab and improving welding stability.
This technology enables multiple weld marks in a single welding operation, improving welding efficiency and quality, reducing the probability of incomplete welds, and ensuring the stability and reliability of the welding process.
Smart Images
Figure CN224073651U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a welding apparatus, a battery cell, a battery device, and an electrical device. Background Technology
[0002] Electrode assemblies are crucial structures within battery cells where electrochemical reactions occur. They are typically formed by stacking and winding positive electrode sheets, separators, and negative electrode sheets, creating a main body and tabs. The tabs are formed by stacking multiple layers of positive or negative electrode sheets; therefore, during battery cell manufacturing, welding is usually used to fix the tabs in place to ensure a stable connection between the tabs and the electrode terminals.
[0003] However, as the energy density of battery cells increases, the thickness of the tabs gradually increases, often requiring multiple welding operations, which not only affects production efficiency but also makes it difficult to control the welding quality. Utility Model Content
[0004] Therefore, it is necessary to provide a welding device, a battery cell, a battery assembly, and electrical equipment to address the current problems of low production efficiency and poor welding quality control when welding tabs.
[0005] In a first aspect, this application provides a welding apparatus for welding the tab portion of an electrode assembly. The tab portion includes a contour zone and a gradient zone, wherein, along the thickness direction of the electrode assembly, the thickness of the gradient zone gradually decreases from one end connected to the contour zone to the other end. The welding apparatus includes a base and at least two welding heads. The base has a first mounting surface. The at least two welding heads protrude from the first mounting surface, and each welding head has a second mounting surface facing away from the first mounting surface. Welding teeth are provided on each second mounting surface. The contour zone and the gradient zone each correspond to at least one welding head, and each welding head simultaneously welds on the corresponding contour zone and gradient zone through its own welding teeth to form a weld mark.
[0006] Each welding tooth has a welding surface that faces away from the second mounting surface; along the direction perpendicular to the first mounting surface, the distance between the welding surface of each welding tooth and the first mounting surface is equal, and the welding teeth of different welding heads protrude from the corresponding second mounting surface at different tooth heights.
[0007] With the above structure, during the welding process, different welding heads can simultaneously weld at different positions on the electrode tab, forming different weld marks, achieving the effect of multiple weld marks in a single weld and improving welding efficiency. Furthermore, the welding teeth on different second mounting surfaces can match equal-height or gradient zones, making the weld marks at different positions more stable and reducing the probability of incomplete welds. Based on this, stable welding of multiple weld marks is achieved through various welding heads and welding teeth of different heights, effectively improving production efficiency and welding quality.
[0008] In some embodiments, at least two welding heads include a first welding head and a second welding head, wherein a first welding tooth is protruding on the second mounting surface of the first welding head, and a second welding tooth is protruding on the second mounting surface of the second welding head; wherein, in a plane parallel to the corresponding second mounting surface, the cross-sectional shapes of the first welding tooth and the second welding tooth are different.
[0009] Thus, by setting the first and second welding teeth as irregularly shaped welding teeth, the shapes of the first and second welding teeth can be better matched with the contour zone or the gradient zone, thereby enabling the first or second welding tooth to make better contact with the surface of the contour zone or the gradient zone and improving the welding quality.
[0010] In some embodiments, along a direction perpendicular to the first mounting surface, the height of the first welding tooth protruding from the corresponding second mounting surface is greater than the height of the second welding tooth protruding from the corresponding second mounting surface; wherein, the first welding tooth is used to weld and form a weld mark in the equal height zone, and the second welding tooth is used to weld and form a weld mark in the gradient zone.
[0011] Therefore, by setting a height difference between the first and second welding teeth, it is possible to better match the height difference between the contour zone and the gradient zone, enabling the first and second welding teeth to perform more stable welding on both the contour zone and the gradient zone simultaneously, thereby improving the welding quality.
[0012] In some embodiments, the height difference between the tooth height of the first welding tooth and the tooth height of the second welding tooth is ΔH; along the thickness direction of the electrode assembly, the thickness difference between the thickness of the second welding tooth at the welding position in the gradient zone and the thickness of the equal-height zone is D, where ΔH=D.
[0013] In this way, by setting the height difference between the first and second welding teeth to be equal to the height difference of the object being welded, the bottom of the welding head with a higher tooth height in the equal height zone and the bottom of the welding head with a lower tooth height in the gradient zone can simultaneously contact the surface of the object being welded during the welding process, thereby effectively reducing the probability of welding defects.
[0014] In some embodiments, the total thickness of the tab is P along the thickness direction of the electrode assembly; the tooth height H1 of the first welding tooth is in the range of 0.25P≤H1≤1.5P.
[0015] Therefore, by setting the tooth height of the first welding tooth within the above-mentioned range, stable welding of the equal-height area can be achieved through the first welding tooth, while reducing the probability of welding cracking and improving welding quality.
[0016] In some embodiments, the height difference between the tooth height of the first welding tooth and the tooth height of the second welding tooth is ΔH, and the total thickness of the electrode lug is P along the thickness direction of the electrode assembly; the tooth height H2 of the second welding tooth is in the range of 0.25P-ΔH≤H1≤1.5P-ΔH.
[0017] Thus, by setting the tooth height of the second welding tooth within the aforementioned range, not only can the gradient zone be stably welded through the second welding tooth, but the risk of over-welding due to the thinness of the gradient zone during the welding process can also be reduced, thereby reducing the probability of cracking of the electrode lug.
[0018] In some embodiments, the first welding tooth is configured as a square welding tooth. Therefore, setting the first welding tooth as a square welding tooth ensures that the surface of the first welding tooth in contact with the contour area is a plane, allowing for good contact between the first welding tooth and the surface of the contour area, thus making the welding more stable.
[0019] In some embodiments, the second welding tooth is configured as a spherical welding tooth. Therefore, configuring the second welding tooth as a spherical welding tooth allows the second welding tooth to make better contact with the surface of the gradient zone, thereby improving the welding quality of the gradient zone.
[0020] In some embodiments, the spacing between any two adjacent welding heads is greater than zero in the direction parallel to the first mounting surface. Thus, by using different welding heads, spaced weld marks can be formed at different positions on the electrode tab, achieving the effect of multi-point weld marks at different positions on the electrode tab and improving the welding stability of the electrode tab.
[0021] In some embodiments, each of the second mounting surfaces is provided with a plurality of weld teeth spaced apart from each other. Thus, by providing multiple weld teeth, multi-point contact is achieved during welding, resulting in a more robust weld and improved welding stability.
[0022] Secondly, this application also provides a battery cell, including a housing and an electrode assembly disposed inside the housing, wherein the tabs of the electrode assembly are welded using the welding device described above.
[0023] Thirdly, this application also provides a battery device, including the battery cell as described above.
[0024] Fourthly, this application also provides an electrical device, including the battery device described above.
[0025] The aforementioned welding device, battery cell, battery assembly, and electrical equipment are equipped with at least two welding heads on the first mounting surface. Each welding head can simultaneously weld different positions on the tab, achieving the effect of multiple weld marks in a single weld and improving welding efficiency. Furthermore, since the thickness of the tab is not completely constant but is divided into equal-height zones and gradient zones, with the thickness of the gradient zone being gradual, the welding teeth on different welding heads are set with different tooth heights. That is, there is a height difference between the welding teeth on different welding heads. In this way, different welding teeth can match the equal-height zones or gradient zones, making the weld marks at different positions more stable and reducing the probability of incomplete welds. Based on this, stable welding of multiple weld marks is achieved through each welding head and its welding teeth with different tooth heights, effectively improving production efficiency and welding quality. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of a welding apparatus according to one or more embodiments.
[0027] Figure 2 This is a schematic diagram of the structure of a first welding head and a second welding head in a welding apparatus according to one or more embodiments.
[0028] Figure 3 This is a schematic diagram of an electrode assembly according to one or more embodiments.
[0029] Figure 4 This is a schematic diagram of the structure of the first welding head in a welding apparatus according to one or more embodiments.
[0030] Figure 5 This is a schematic diagram of the structure of the second welding head in a welding apparatus according to one or more embodiments.
[0031] Explanation of reference numerals in the attached drawings: 100, welding device; 200, electrode assembly; 201, electrode lug; 202, contour zone; 203, gradient zone; 10, base; 20, first welding head; 30, second welding head; 40, second mounting surface; 11, first mounting surface; 21, first welding tooth; 31, second welding tooth; a, thickness direction. Detailed Implementation
[0032] 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.
[0033] 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.
[0034] 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] For an electrode assembly, the portion of the positive or negative electrode plate coated with active material constitutes the main body of the electrode assembly, while the portion of the positive or negative electrode plate not coated with active material constitutes the tab. Specifically, the positive electrode plate forms the tab of the positive electrode, and the negative electrode plate forms the tab of the negative electrode.
[0042] With the rapid development of new energy technologies, the performance requirements for individual battery cells are becoming increasingly stringent. Consequently, the number of layers in the electrode assembly, including the positive electrode, separator, and negative electrode, is increasing. This leads to an increase in the thickness of the electrode tabs.
[0043] For thicker electrode tabs, a single solder mark may lead to poor welding or incomplete soldering. Therefore, multiple soldering operations are currently required for the electrode tabs to improve welding stability. However, this process of multiple soldering operations not only reduces welding efficiency, affecting overall production efficiency, but also makes it difficult to control welding quality.
[0044] Based on the above considerations, to address the current problems of low production efficiency and poor weld quality control when welding electrode tabs, one or more embodiments of this application provide a welding apparatus. At least two welding heads are disposed on a first mounting surface, each capable of simultaneously welding different positions on the electrode tab, achieving the effect of multiple weld marks in a single weld and improving welding efficiency. Furthermore, since the thickness of the electrode tab is not completely constant but divided into equal-height zones and gradient zones, with the thickness of the gradient zone being gradual, the welding teeth on different welding heads are set with different tooth heights. That is, there is a height difference between the welding teeth on different welding heads. In this way, different welding teeth can match the equal-height zones or gradient zones, making the weld marks at different positions more stable and reducing the probability of incomplete welds. Based on this, stable welding of multiple weld marks is achieved through each welding head and its welding teeth with different tooth heights, effectively improving production efficiency and weld quality.
[0045] 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.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.
[0050] The battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft.
[0051] Please refer to the following: Figure 1 and Figure 2 One embodiment of this application provides a welding apparatus 100 for welding the tab 201 of an electrode assembly 200. For example... Figure 3 As shown, the tab portion 201 includes a contour region 202 and a gradient region 203. Along the thickness direction a of the electrode assembly 200, the thickness of the gradient region 203 gradually decreases from one end connected to the contour region 202 to the other end. The welding device 100 includes a base 10 and at least two welding heads. The base 10 has a first mounting surface 11, and the at least two welding heads protrude from the first mounting surface 11, each welding head having a second mounting surface 40 facing away from the first mounting surface 11. Each second mounting surface 40 is provided with welding teeth. The contour region 202 and the gradient region 203 each correspond to at least one welding head, and each welding head simultaneously welds to form a weld mark on the corresponding contour region 202 and gradient region 203 using its own welding teeth. Each welding tooth has a welding surface facing away from the second mounting surface 40. Along the direction perpendicular to the first mounting surface 11, the distance W between the welding surface of each welding tooth and the first mounting surface 11 is equal, and the welding teeth of different welding heads protrude from the corresponding second mounting surface 40 at different heights.
[0052] It should be noted that a battery cell typically includes a casing and an electrode assembly 200. The interior of the casing forms a cavity for accommodating the electrode assembly 200 and other functional components, and provides good protection for the electrode assembly 200 and other functional components placed within the cavity. The casing includes a top cover and a casing body; the top cover and casing body can be assembled or integrally formed.
[0053] The electrode assembly 200 is typically formed by stacking and winding a positive electrode, a separator, and a negative electrode. The portion of the positive or negative electrode coated with an active material constitutes the main body of the electrode assembly 200, while the portion of the positive or negative electrode not coated with an active material constitutes the tab portion 201.
[0054] Therefore, the tab portion 201 is actually formed by stacking multiple positive or negative electrode sheets. The tab portion 201 is often not of constant thickness, but is divided into a constant-height region 202 and a gradient region 203. The constant-height region 202 connects the gradient region 203 and the main body, and the thickness of the constant-height region 202 remains constant, while the thickness of the gradient region 203 gradually decreases from the end connected to the constant-height region 202 to the other end.
[0055] Understandably, to allow the electrode assembly 200 to fit better into the housing, its shape often matches the shape of the housing. Therefore, the thickness direction 'a' of the electrode assembly 200 is also the thickness direction of the battery cell. A battery cell typically includes two large surfaces, two side surfaces, a top surface, and a bottom surface; the large surfaces refer to the surfaces 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 thickness direction is perpendicular to the large surfaces.
[0056] When welding the tab 201, if multiple weld marks are to be formed, either a single welding head is used to weld multiple times on the tab 201, which is relatively inefficient, or multiple parallel welding heads are used to achieve the effect of forming multiple weld marks with a single press. However, this method is prone to problems such as partial cold welds or over-welding in thinner areas in the equal height area 202 and the gradient area 203 of the tab 201.
[0057] Therefore, the welding apparatus 100 of this application includes a base 10 and at least two welding heads. The base 10 has a first mounting surface 11, which is a plane. At least two welding heads protrude from the first mounting surface 11, and the side of each welding head facing away from the first mounting surface 11 is constructed as a second mounting surface 40, that is, the second mounting surface 40 of each welding head is arranged parallel to the first mounting surface 11.
[0058] Welding teeth are provided on the second mounting surface 40 of each welding head, and welding is achieved by the welding teeth contacting the surface of the electrode tab 201.
[0059] Furthermore, along the direction perpendicular to the first mounting surface 11, the distance between the welding surface of each welding tooth and the first mounting surface 11 is equal. That is, the welding surfaces of the welding teeth on different second mounting surfaces 40 are all located on the same horizontal plane. The protrusion height of the welding teeth on the corresponding second mounting surface 40 is different between different welding heads. In other words, the protrusion height of the welding teeth on one second mounting surface 40 is different from the protrusion height of the welding teeth on another second mounting surface 40.
[0060] Thus, during welding, at least one welding tooth on the second mounting surface 40 forms a weld mark in the contour zone 202, and at least another welding tooth on the second mounting surface 40 forms a weld mark in the gradient zone 203. At the same time, the tooth bases of the welding teeth corresponding to the contour zone 202 and the welding teeth corresponding to the gradient zone 203 can simultaneously contact the surface of the tab portion 201, making the welding at different positions more stable.
[0061] With the above structure, during the welding process, different welding heads can simultaneously weld at different positions on the electrode tab 201, forming different weld marks, achieving the effect of multiple weld marks in a single weld and improving welding efficiency. Furthermore, the welding teeth on different second mounting surfaces 40 can be matched with equal-height zones 202 or gradient zones 203, making the weld marks at different positions more stable and reducing the probability of incomplete welds. Based on this, stable welding of multiple weld marks is achieved through each welding head and its welding teeth of different heights, effectively improving production efficiency and welding quality.
[0062] In some embodiments, at least two welding heads include a first welding head 20 and a second welding head 30. The second mounting surface 40 of the first welding head 20 is provided with a first welding tooth 21, and the second mounting surface 40 of the second welding head 30 is provided with a second welding tooth 31. The first welding tooth 21 and the second welding tooth 31 have different cross-sectional shapes in a plane parallel to the corresponding second mounting surface 40.
[0063] Specifically, two welding heads, namely a first welding head 20 and a second welding head 30, can be respectively provided on the first mounting surface 11. The second mounting surface 40 of the first welding head 20 is provided with a first welding tooth 21 protruding therefrom, and the second mounting surface 40 of the second welding head 30 is provided with a second welding tooth 31 protruding therefrom.
[0064] Furthermore, in a plane parallel to the corresponding second mounting surface 40, the cross-sectional shapes of the first welding tooth 21 and the second welding tooth 31 are different. That is, the first welding tooth 21 and the second welding tooth 31 are welding teeth of different shapes. For example, the first welding tooth 21 can be set as a square welding tooth, and the second welding tooth 31 can be set as a circular or spherical welding tooth.
[0065] Thus, by setting the first welding tooth 21 and the second welding tooth 31 as irregular welding teeth, the shapes of the first welding tooth 21 and the second welding tooth 31 can better match the contour zone 202 or the gradient zone 203, thereby enabling the first welding tooth 21 or the second welding tooth 31 to better contact the surface of the contour zone 202 or the gradient zone 203 and improve the welding quality.
[0066] In some embodiments, along a direction perpendicular to the first mounting surface 11, the height of the first welding tooth 21 protruding from the corresponding second mounting surface 40 is greater than the height of the second welding tooth 31 protruding from the corresponding second mounting surface 40. The first welding tooth 21 is used to weld and form a weld mark in the contour zone 202, and the second welding tooth 31 is used to weld and form a weld mark in the gradient zone 203.
[0067] Specifically, along the direction perpendicular to the first mounting surface 11, the distance by which the first welding tooth 21 protrudes from the second mounting surface 40 is the tooth height of the first welding tooth 21. Similarly, the distance by which the second welding tooth 31 protrudes from the second mounting surface 40 is the tooth height of the second welding tooth 31. Among these, the tooth height of the first welding tooth 21 is greater than the tooth height of the second welding tooth 31.
[0068] Furthermore, the first welding tooth 21 corresponds to the position of the contour zone 202, and the second welding tooth 31 corresponds to the position of the gradient zone 203. Thus, the first welding tooth 21 can be used to weld and form a weld mark in the contour zone 202, and the second welding tooth 31 can be used to weld and form a weld mark in the gradient zone 203.
[0069] Therefore, by setting the height difference between the first welding tooth 21 and the second welding tooth 31, it can better match the height difference between the equal height zone 202 and the gradient zone 203, so that the first welding tooth 21 and the second welding tooth 31 can simultaneously perform more stable welding on the equal height zone 202 and the gradient zone 203, thereby improving the welding quality.
[0070] In some embodiments, the height difference between the tooth height of the first welding tooth 21 and the tooth height of the second welding tooth 31 is ΔH. Along the thickness direction a of the electrode assembly 200, the thickness difference between the thickness of the second welding tooth 31 at the welding position in the gradient region 203 and the thickness of the constant height region 202 is D, where ΔH=D.
[0071] Specifically, the height difference between the tooth height of the first welding tooth 21 and the tooth height of the second welding tooth 31 is the difference between the distance by which the first welding tooth 21 protrudes from the second mounting surface 40 and the distance by which the second welding tooth 31 protrudes from the second mounting surface 40.
[0072] Furthermore, along the thickness direction a of the electrode assembly 200, the thickness difference between the thickness of the second welding tooth 31 at the welding position in the gradient zone 203 and the thickness of the equal height zone 202 is the height difference of the welding object.
[0073] In this way, the height difference between the tooth height of the first welding tooth 21 and the tooth height of the second welding tooth 31 is set to be equal to the height difference of the welding object. This allows the bottom of the welding head with a higher tooth height corresponding to the equal height zone 202 and the bottom of the welding head with a lower tooth height corresponding to the gradient zone 203 to simultaneously contact the surface of the welding object, thereby effectively reducing the probability of welding defects.
[0074] In some embodiments, along the thickness direction a of the electrode assembly 200, the total thickness of the tab portion 201 is P; the tooth height H1 of the first welding tooth 21 ranges from 0.25P≤H1≤1.5P.
[0075] Specifically, the tooth height of the first welding tooth 21 is adjusted according to the total thickness of the electrode lug 201. By setting the tooth height of the first welding tooth 21 within the above-mentioned range, stable welding of the equal height zone 202 can be performed through the first welding tooth 21, while reducing the probability of welding cracking and improving welding quality.
[0076] In some embodiments, the height difference between the tooth height of the first welding tooth 21 and the tooth height of the second welding tooth 31 is ΔH, and the total thickness of the electrode tab 201 along the thickness direction a of the electrode assembly 200 is P; the tooth height H2 of the second welding tooth 31 is in the range of 0.25P-ΔH≤H2≤1.5P-ΔH.
[0077] Specifically, the tooth height of the second welding tooth 31 is related to the total thickness of the electrode lug 201, and is also related to the tooth height of the first welding tooth 21.
[0078] Thus, by setting the tooth height of the second welding tooth 31 within the above range, not only can the gradient region 203 be stably welded through the second welding tooth 31, but the risk of over-welding due to the thinness of the gradient region 203 during the welding process can also be reduced, thereby reducing the probability of cracking of the electrode tab 201.
[0079] like Figure 4 As shown, in some embodiments, the first welding tooth 21 is configured as a square welding tooth.
[0080] Specifically, the first welding tooth 21 is used to weld the contour zone 202, while the thickness of the contour zone 202 remains unchanged, that is, the welding surface of the contour zone 202 is a plane.
[0081] Therefore, the first welding tooth 21 is set as a square welding tooth, so that the surface of the first welding tooth 21 in contact with the contour zone 202 is a plane, and the first welding tooth 21 can make good contact with the surface of the contour zone 202, making the welding more stable.
[0082] like Figure 5 As shown, in some embodiments, the second welding tooth 31 is configured as a spherical welding tooth.
[0083] Specifically, the second welding tooth 31 is used to weld the gradient region 203, and the thickness of the gradient region 203 is gradual, that is, the welding surface of the gradient region 203 is an inclined surface.
[0084] Therefore, the second welding tooth 31 is set as a spherical welding tooth, so that the second welding tooth 31 can make better contact with the surface of the gradient zone 203 and improve the welding quality of the gradient zone 203.
[0085] Of course, it is understandable that the shapes of the first welding tooth 21 and the second welding tooth 31 can also be set to other shapes, such as circular welding teeth, electric spark patterns, chain welding teeth, etc., which can also achieve welding of the equal height zone 202 and the gradient zone 203, which will not be elaborated here.
[0086] In some embodiments, the spacing between any two adjacent weld heads is greater than zero in the direction parallel to the first mounting surface 11.
[0087] Specifically, each welding head is spaced apart on the first mounting surface 11, and the distance between two adjacent welding heads is greater than zero. In this way, different welding heads can form mutually spaced weld marks at different positions on the tab 201, so as to achieve the effect of multi-point weld marks at different positions on the tab 201 and improve the welding stability of the tab 201.
[0088] As a specific embodiment, considering the manufacturability of the welding heads, the spacing between adjacent welding heads can be set to be greater than 3mm. Here, the spacing between adjacent welding heads refers to the inner spacing between adjacent welding heads.
[0089] In some embodiments, each of the second mounting surfaces 40 is provided with a plurality of weld teeth spaced apart from each other.
[0090] Specifically, the second mounting surface 40 of the first welding head 20 may be provided with multiple square welding teeth, and the square welding teeth are spaced apart from each other. The second mounting surface 40 of the second welding head 30 may be provided with multiple spherical welding teeth, and the spherical welding teeth are spaced apart from each other.
[0091] Therefore, by setting multiple welding teeth, multi-point contact can be achieved during welding, making the weld mark more solid and improving welding stability.
[0092] Based on the same concept as the welding device 100 described above, this application also provides a battery cell, including a housing and an electrode assembly 200 disposed inside the housing, wherein the tab portion 201 of the electrode assembly 200 is welded using the welding device 100 described above.
[0093] Based on the same concept as the aforementioned battery cell, this application also provides a battery device including the battery cell described above.
[0094] Based on the same concept as the battery device described above, this application also provides an electrical device including the battery device described above.
[0095] According to one or more embodiments, in specific use, the first welding head 20 is positioned corresponding to the contour zone 202, and the second welding head 30 is positioned corresponding to the gradient zone 203. The first welding tooth 21 and the second welding tooth 31 are controlled to contact the surfaces of the contour zone 202 and the gradient zone 203 respectively, and welding is achieved by continuous downward pressure.
[0096] At this time, the first welding tooth 21 and the contour zone 202 are in plane-to-plane contact, and the second welding tooth 31 and the gradient zone 203 are in arc-to-sloping contact, so that the contour zone 202 and the gradient zone 203 can be stably welded respectively.
[0097] Furthermore, due to the height difference between the first welding tooth 21 and the second welding tooth 31, the tooth base of the first welding tooth 21 and the tooth base of the second welding tooth 31 can simultaneously contact their respective welding surfaces, thereby effectively reducing the probability of welding defects.
[0098] 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.
[0099] 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 welding apparatus for welding the tab portion of an electrode assembly, the tab portion comprising a contour zone and a gradient zone, wherein, Along 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; characterized in that the welding apparatus comprises: The base has a first mounting surface; and At least two welding heads are protruding from the first mounting surface, and each welding head has a second mounting surface facing away from the first mounting surface. Each second mounting surface is provided with welding teeth. The contour zone and the gradient zone correspond to at least one welding head, and each welding head synchronously welds to form a weld mark on the corresponding contour zone and the gradient zone through its own welding teeth. Each of the welding teeth has a welding surface facing away from the second mounting surface; along a direction perpendicular to the first mounting surface, the distance between the welding surface of each welding tooth and the first mounting surface is equal, and the welding teeth on different welding heads protrude at different tooth heights from the corresponding second mounting surface.
2. The welding apparatus according to claim 1, characterized in that, The at least two welding heads include a first welding head and a second welding head. The first welding head has a first welding tooth protruding on its second mounting surface, and the second welding head has a second welding tooth protruding on its second mounting surface. In a plane parallel to the second mounting surface, the cross-sectional shapes of the first welding tooth and the second welding tooth are different.
3. The welding apparatus according to claim 2, characterized in that, Along the direction perpendicular to the first mounting surface, the height of the first welding tooth protruding from the corresponding second mounting surface is greater than the height of the second welding tooth protruding from the corresponding second mounting surface. The first welding tooth is used to weld and form a weld mark in the contour zone, and the second welding tooth is used to weld and form a weld mark in the gradient zone.
4. The welding apparatus according to claim 3, characterized in that, The height difference between the tooth height of the first welding tooth and the tooth height of the second welding tooth is ΔH; along the thickness direction of the electrode assembly, the thickness difference between the thickness of the second welding tooth at the welding position in the gradient zone and the thickness of the equal height zone is D, where ΔH=D.
5. The welding apparatus according to claim 3, characterized in that, Along the thickness direction of the electrode assembly, the total thickness of the tab portion is P; the tooth height H1 of the first welding tooth ranges from 0.25P≤H1≤1.5P.
6. The welding apparatus according to claim 3, characterized in that, The height difference between the tooth height of the first welding tooth and the tooth height of the second welding tooth is ΔH. The total thickness of the electrode lug is P along the thickness direction of the electrode assembly. The tooth height H2 of the second welding tooth is in the range of 0.25P-ΔH≤H1≤1.5P-ΔH.
7. The welding apparatus according to claim 2, characterized in that, The first welding tooth is constructed as a square welding tooth.
8. The welding apparatus according to claim 2 or 7, characterized in that, The second welding tooth is constructed as a spherical welding tooth.
9. The welding apparatus according to claim 1, characterized in that, In a direction parallel to the first mounting surface, the spacing between any two adjacent welding heads is greater than zero.
10. The welding apparatus according to claim 1, characterized in that, Each of the second mounting surfaces is provided with a plurality of welding teeth spaced apart from each other.
11. A single battery cell, characterized in that, The device includes a housing and an electrode assembly disposed inside the housing, wherein the tabs of the electrode assembly are welded using a welding apparatus as described in any one of claims 1-10.
12. A battery device, characterized in that, Includes the battery cell as described in claim 11.
13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12.