Battery device

Abstract

The utility model relates to battery technology field, concretely relates to a battery device, and the battery device includes: first component and second component, welding assembly is arranged between first component and second component, and simultaneously connects first component and second component, welding assembly is provided with a plurality of welding parts in first component, and the difference h between the penetration of adjacent two welding parts has, the range of difference h is between 0.1mm < h < 1.0mm. This embodiment sets up a plurality of welding parts, compared with single area's welding part, can obviously improve the overcurrent area. Moreover, this embodiment carries out the differentiation adjustment to the penetration of adjacent two welding parts, can reduce the conduction efficiency of heat from the deep fusion area to the shallow fusion area, avoids the heat when welding too big, can obviously improve the welding quality and welding strength.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and specifically to a battery device. Background Technology

[0002] Currently, the conductive busbars in the battery pack are connected to the terminals of individual cells in the battery pack by welding to ensure sufficient connection strength between the conductive busbars and the cells, thereby ensuring the normal operation and stable performance of the battery pack.

[0003] However, in actual welding processes, multiple welding zones are often set up to increase the flow area. However, when the same welding method is used and multiple welding zones are close together, heat buildup occurs, leading to uneven local expansion at the welding point, which affects welding quality and strength. Utility Model Content

[0004] In view of this, the present invention provides a battery device to solve the problem that welding quality and welding strength cannot be guaranteed when the flow area is increased.

[0005] In a first aspect, the present invention provides a battery device, the battery device comprising:

[0006] First component and second component;

[0007] A welding assembly is disposed between the first component and the second component, and simultaneously connects the first component and the second component;

[0008] The welding assembly has multiple welding parts in the first component, and there is a difference h between the penetration depth of two adjacent welding parts; the difference h is in the range of 0.1 mm < h < 1.0 mm.

[0009] Beneficial Effects: This embodiment features multiple welding sections. Compared to a single-area welding section, when both the first and second components are conductive, the current-carrying area is significantly increased. Furthermore, when two adjacent welding sections have the same weld depth and are close together, the heat generated by the previous welding has not been fully dissipated, and the heat source of the subsequent welding will overlap with the heat-affected zone of the previous welding, leading to a sharp increase in local temperature and heat accumulation. To avoid heat accumulation between adjacent welding sections, this embodiment differentiates the weld depth between adjacent welding sections. Because the weld depths of adjacent welding sections differ, the shallower area has less base material melting and lower heat input, forming a "thermal buffer zone." This reduces the efficiency of heat conduction from the deep-melting zone to the shallow-melting zone, preventing excessive overlap of the heat-affected zones of adjacent welding sections, thereby reducing local temperature peaks and avoiding excessive heat during welding, which can lead to uneven local expansion at the welding position. This significantly improves welding quality and strength. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the battery device in an embodiment of the present invention;

[0012] Figure 2 for Figure 1 A sectional view of section AA;

[0013] Figure 3 for Figure 2 A magnified view of part B in the diagram.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Terminal post; 2. Conductor busbar; 3. Welding assembly; 31. First welding section; 32. Second welding section. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Currently, the conductive busbar 2 in the battery pack is connected to the terminal post 1 of each individual battery cell by welding to ensure sufficient connection strength between the conductive busbar 2 and the battery, thereby guaranteeing the normal operation and stable performance of the battery pack. However, in the actual welding process, multiple welding areas are set up to increase the current flow area. However, when the same welding method is used and multiple welding areas are close together, heat accumulation will occur, leading to uneven local expansion at the welding position, affecting the welding quality and welding strength.

[0021] In view of this, the present invention provides a battery device to solve the problem that welding quality and welding strength cannot be guaranteed when the flow area is increased.

[0022] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0023] According to an embodiment of the present invention, a battery device is provided, which includes a first component, a second component, and a welding assembly 3.

[0024] Specifically, in this embodiment, the first component and the second component can be conductive components that are directly welded between two adjacent cells in the battery pack when there is no busbar, or they can be fixed welds between the end plate or side plate and the cells in the battery device, or they can be sealing welds between the battery pack tray and the top cover, or they can be welds between the liquid cooling pipes and the liquid cooling plate in the battery device.

[0025] Of course, this embodiment is merely an example illustrating the specific types of the first and second components, but it does not limit the scope of the embodiment. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0026] Furthermore, the welding assembly 3 is disposed between the first component and the second component, and simultaneously connects the first component and the second component. Moreover, the welding assembly 3 has multiple welding points on the first component, for example, three, four, five, six, etc. Figure 3 As shown, there is a difference h between the penetration depths of two adjacent welded parts, and the range of the difference h is between 0.1 mm < h < 1.0 mm.

[0027] For example, the difference h can be selected from values ​​such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, etc. Of course, this embodiment is merely an example of a specific value for the difference, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0028] Specifically, penetration depth refers to the depth to which the base material, i.e., the workpiece being welded, melts under the influence of the welding heat source during the welding process; it is the vertical distance from the root of the weld to the original surface of the base material. In other words, it's the degree to which the weld penetrates the base material. In this embodiment, the penetration depth of two adjacent welded sections differs, meaning that the welding process is not the same.

[0029] With this configuration, this embodiment features multiple welding sections. Compared to a single-area welding section, this significantly increases the current-carrying area when both the first and second components are conductive. Furthermore, when two adjacent welding sections have the same weld depth and are close together, the heat generated by the previous welding has not yet been fully dissipated. The heat source of the subsequent welding will overlap with the heat-affected zone of the previous welding, leading to a sharp increase in local temperature and heat accumulation. To avoid heat accumulation between adjacent welding sections, this embodiment differentiates the weld depth between them. Because the weld depths of adjacent welding sections differ, the shallower region has less base material melting and lower heat input, forming a "thermal buffer zone." This reduces the efficiency of heat conduction from the deep-melting zone to the shallow-melting zone, preventing excessive overlap of the heat-affected zones of adjacent welding sections, thereby reducing local temperature peaks and avoiding excessive heat during welding, which can lead to uneven local expansion at the welding position. This significantly improves welding quality and strength.

[0030] Furthermore, in an alternative implementation, the difference h ranges from 0.3 mm < h < 0.8 mm.

[0031] For example, the difference h can be further selected as values ​​such as 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, etc. Of course, this embodiment is merely an example of a specific value for the difference, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0032] By setting it up in this way, this embodiment limits the difference within a certain range. While increasing the flow area, it can also reduce the local temperature peak, avoiding excessive heat during welding, thereby improving welding quality and welding strength. If it is below this range, heat accumulation will occur; if it is above this range, the additional welding part will not play a reinforcing role and may even damage another welding part, thereby reducing welding strength and affecting welding quality.

[0033] Furthermore, in one optional embodiment, the welded portion is either a closed welding trajectory or an open welding trajectory. That is, among multiple welded portions, some welded portions may use a closed welding trajectory, while others may use an open welding trajectory. Of course, all welded portions may use a closed welding trajectory, or all welded portions may use an open welding trajectory. This embodiment is merely an example illustrating the specific types of welded portions, but it is not intended to limit the scope. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0034] Furthermore, in one optional embodiment, the closed welding trajectory is a circular welding trajectory. Of course, the welding trajectory can also be spiral, serpentine, circular, elliptical, linear, etc. This embodiment is merely an example illustrating specific types of welding trajectories, but it is not intended to limit them. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0035] This configuration, by employing a circular welding trajectory, allows the starting and ending points of the welding trajectory to coincide, avoiding joint problems at the "arc start" and "arc end" points, such as craters, lack of fusion, and porosity, that are present in traditional straight-line welding or discontinuous welding trajectories. Therefore, the overall weld continuity is stronger in this embodiment. Simultaneously, the closed circular weld can evenly distribute welding stress, reducing the risk of cracking due to stress concentration at the endpoints. Furthermore, during the welding process, the uniform heat distribution of the circular weld can effectively suppress bending or torsional deformation caused by unilateral thermal expansion.

[0036] Furthermore, in an alternative implementation, such as Figures 1 to 3 As shown, the first component is the battery terminal 1, and the second component is the conductive busbar 2.

[0037] Furthermore, in an optional embodiment, the welding assembly 3 has an edge end near the edge of the pole post 1, such as... Figure 3 As shown, a gap a is provided between the edge end and the edge of pole post 1, and the gap range is a≥1.4mm.

[0038] With this configuration, a gap is provided between the edge end and the edge of the pole 1 in this embodiment. Within this gap, heat source energy can be transferred to the edge of the base material. After the edge temperature reaches the melting point, it can mix with the molten pool metal to form a continuous metallurgical bonding layer. In this way, the heat source energy is matched with the edge heat dissipation, the molten pool spreads well, and incomplete welding or the formation of burr weld edges is avoided.

[0039] Furthermore, in an optional embodiment, the welding assembly 3 is provided with a first welding portion 31 and a second welding portion 32, the first welding portion 31 being formed by a first molten pool and the second welding portion 32 being formed by a second molten pool, the edges of the first molten pool and the edges of the second molten pool being connected.

[0040] This configuration connects the edges of two adjacent molten pools, allowing them to be linked together in high-temperature areas, thus increasing the heat dissipation area. During heat dissipation, heat can be conducted to the base material on both sides along the connecting path, reducing heat input per unit area. Simultaneously, the two connected molten pools can form a uniform temperature field, preventing single-point overheating and smoothing the temperature gradient. Furthermore, the cooling of the two molten pools can reduce internal stress caused by temperature differences.

[0041] Furthermore, in an alternative implementation, such as Figure 3 As shown, the first weld depth of the first weld 31 is h1, and the second weld depth of the second weld 32 is h2. The range of the first weld depth is between 0.5mm < h1 < 1.75mm, and the range of the second weld depth is between 0.5mm < h2 < 1.75mm.

[0042] For example, the first and second penetration depths can be selected from values ​​such as 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.74mm, etc. Of course, this embodiment is merely an example illustrating specific values ​​for the difference, and is not intended to limit the scope. Those skilled in the art can modify these values ​​according to actual circumstances, as long as the same technical effect is achieved.

[0043] By limiting the penetration depth within a certain range, this embodiment allows the weld metal and base metal to fully mix in a molten state, forming a continuous metallurgical bond layer with a bond strength close to that of the base metal, thereby improving the overall weld strength. If the penetration depth is too small, the weld metal and base metal will not form a sufficient metallurgical bond, resulting in a weak layer at the interface, leading to poor weld quality and strength. Conversely, if the penetration depth is too large, it will directly result in excessively high heat input, causing a decrease in weld toughness and even cold cracking after cooling, which will also affect weld quality and strength.

[0044] Furthermore, in an alternative implementation, such as Figure 3 As shown, the edges of the first molten pool and the edges of the second molten pool overlap to form an overlapping area. The width of the overlapping area is d, and the width ranges from 0 to d to 0.8 mm.

[0045] For example, the width d can be selected from values ​​such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.; when d=0, the first molten pool and the second molten pool are adjacent. Of course, this embodiment is only an example of the specific value of the difference, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0046] This configuration, with its overlapping area, allows the heat-affected zones of the two molten pools to connect, creating a larger heat dissipation area and effectively reducing heat buildup. During heat dissipation, heat can be dissipated longitudinally, along the weld length, through the overlapping area to the solidified weld metal, and also laterally, diffused to both sides of the base material, further expanding the heat dissipation area.

[0047] Furthermore, in an alternative implementation, such as Figure 3 As shown, the first molten pool has a first molten width of d1, and the second molten pool has a second molten width of d2. The range of the first molten width is 0 < d1 ≤ 2.6 mm, and the range of the second molten width is 0 < d2 ≤ 2.6 mm.

[0048] For example, the first weld width and the second weld width can be selected from values ​​such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, etc. Of course, this embodiment is merely an example of specific values ​​for the difference, and does not impose limitations. Those skilled in the art can modify these values ​​according to actual circumstances, as long as the same technical effect is achieved.

[0049] Furthermore, as a preferred embodiment, the first weld width is in the range of 1mm≤d1≤2.2mm, and the second weld width is in the range of 1mm≤d2≤2.2mm.

[0050] For example, the first weld width and the second weld width can be selected from values ​​such as 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, etc. Of course, this embodiment is merely an example of specific values ​​for the difference, and is not intended to limit the scope. Those skilled in the art can modify these values ​​according to actual circumstances, as long as the same technical effect is achieved.

[0051] By limiting the weld width within a certain range, this embodiment reduces the amplitude of the laser spot's oscillation, concentrating energy at the weld center. The energy density at the edges is sufficient to melt the base metal and fill the molten pool, preventing undercut and double peaks. When the weld width is too wide, the laser spot needs to oscillate significantly laterally, reducing the energy density at the edges and causing energy dispersion. The melted base metal cannot be promptly filled by the weld metal, resulting in a depression, i.e., undercut. Furthermore, when the weld width is too wide, the laser spot needs to oscillate at high frequency, causing the molten pool metal to flow and solidify to both sides under surface tension and gravity, forming "double peaks." Moreover, when the weld width is too narrow, it directly reduces the cross-sectional area of ​​the weld metal, decreasing its tensile, compressive, and shear strengths, making it prone to fracture under stress, thus affecting weld quality and strength.

[0052] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery device, characterized in that, include: First component and second component; A welding assembly (3) is disposed between the first component and the second component, and simultaneously connects the first component and the second component; The welding assembly (3) has multiple welding parts on the first component, and there is a difference h between the penetration depth of two adjacent welding parts; the difference h is in the range of 0.1mm < h < 1.0mm.

2. The battery device according to claim 1, characterized in that, The difference h is in the range of 0.3 mm < h < 0.8 mm.

3. The battery device according to claim 1, characterized in that, The welded section is either a closed welding trajectory or an open welding trajectory.

4. The battery device according to claim 3, characterized in that, The closed welding trajectory is a circular welding trajectory.

5. The battery device according to any one of claims 1 to 4, characterized in that, The first component is the battery terminal (1), and the second component is the conductive bus (2).

6. The battery device according to claim 5, characterized in that, The welding assembly (3) has an edge end near the edge of the pole post (1), and a distance a is provided between the edge end and the edge of the pole post (1), wherein the distance a is ≥ 1.4 mm.

7. The battery device according to any one of claims 1 to 4, characterized in that, The welding assembly (3) is provided with a first welding part (31) and a second welding part (32). The first welding part (31) is formed by a first molten pool, and the second welding part (32) is formed by a second molten pool. The edges of the first molten pool and the edges of the second molten pool are connected.

8. The battery device according to claim 7, characterized in that, The first weld depth of the first weld (31) is h1, and the second weld depth of the second weld (32) is h2. The range of the first weld depth is between 0.5mm < h1 < 1.75mm, and the range of the second weld depth is between 0.5mm < h2 < 1.75mm.

9. The battery device according to claim 7, characterized in that, The edges of the first molten pool and the edges of the second molten pool overlap to form an overlapping area, the width of which is d, and the width is in the range of 0≤d≤0.8mm.

10. The battery device according to claim 7, characterized in that, The first molten pool has a first molten width of d1, and the second molten pool has a second molten width of d2. The first molten width is in the range of 0 < d1 ≤ 2.6 mm, and the second molten width is in the range of 0 < d2 ≤ 2.6 mm.

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