Busbar structure and battery

Abstract

The utility model discloses a busbar structure and battery, busbar structure is used for battery, and busbar structure includes the lug part and busbar body. The busbar body includes the interval arrangement's injection hole and the welding area. The welding area has the first soldering part, and the first soldering part is used for connecting the lug part. Wherein, the first soldering part includes a plurality of first soldering groups, and a part of first soldering group in a plurality of first soldering groups jointly constitutes the first sawtooth type soldering. This scheme can reduce the situation of local overheating or thermal stress concentration of busbar structure, and then reduce the welding deformation, welding crack and the stress generated in the welding process, guarantee the stability and reliability of lug part and busbar body welding, avoid the situation that the battery short circuit occurs.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a busbar structure and a battery. Background Technology

[0002] All-tab technology can significantly improve the core performance of batteries, such as charge / discharge rate, and broaden the application range of batteries. Specifically, all-tab batteries can be used in many fields such as electric vehicles, scooters, eVTOL (electric vertical takeoff and landing aircraft), and robots. The manufacturing process of all-tab batteries is more difficult, especially in the collection and welding of tabs. For example, controlling the tab shape, welding precision, and temperature control are all key factors affecting production yield.

[0003] In related technologies, busbar welding is a critical step in the manufacturing of all-tab batteries and one of the bottlenecks in high-speed assembly lines. The precision and quality of busbar welding directly affect the battery's internal resistance, heat dissipation performance, and safety. If the welding temperature of the busbar is too high, it may cause the separator to shrink due to heat or break down due to splashing, leading to a short circuit in the battery. Utility Model Content

[0004] The main purpose of this utility model is to propose a busbar structure and battery, which aims to solve the technical problem of battery short circuit caused by busbar welding.

[0005] To achieve the above objectives, a first aspect of this utility model provides a busbar structure for a battery, the busbar structure comprising:

[0006] Extreme ear area;

[0007] The manifold body includes spaced-apart injection holes and a welding area, wherein the welding area has a first solder mark, which is used to connect the electrode tab.

[0008] The first solder mark includes multiple first solder groups, and a portion of the multiple first solder groups together form a first serrated solder mark.

[0009] In some embodiments, another portion of the first welding group in a plurality of the first welding groups together constitutes a second serrated weld mark, and the second serrated weld mark and the first serrated weld mark are arranged radially symmetrically along the busbar body.

[0010] In some embodiments, the welding area has a second solder mark spaced apart from the first solder mark, the second solder mark being used to connect the electrode tab, and the second solder mark including multiple sets of second solder groups;

[0011] A portion of the second welding groups together form a third serrated weld mark, and another portion of the second welding groups together form a fourth serrated weld mark. The third serrated weld mark and the fourth serrated weld mark are arranged symmetrically along the radial direction of the manifold body.

[0012] In some embodiments, the first welding group includes a first welding line and a second welding line arranged at intervals, the first welding line and the second welding line being arranged at an acute angle, and the second welding line of the first welding group being arranged at an acute angle to the first welding line of the adjacent first welding group, and the length of the first welding line being greater than the length of the second welding line.

[0013] In some embodiments, the manifold body is at least partially arc-shaped, the radius of the manifold body is A, the manifold body includes a first drain hole located at the center and a second drain hole located on the side, the radius of the first drain hole is B, and the radius of the second drain hole is C.

[0014] The first weld wire is located on the side of the second weld wire facing the first liquid outlet, and the length of the first weld wire is L1, where L1 is [√2×(ABC)]. 2 -0.8]mm, the length of the second bonding wire is L2, L2 is [2 / 3L1-1]mm, the distance between the first bonding wire and the second bonding wire is L3, L3 satisfies: 1mm≤L3≤4mm.

[0015] In some embodiments, any two adjacent first weld groups include a first first weld group closer to the first liquid outlet and a second first weld group away from the first liquid outlet; and,

[0016] The length of the first weld wire in the first first weld group is L1, and the length of the first weld wire in the second first weld group is (1+0.1)×L1; and / or,

[0017] The length of the second weld wire in the first first weld group is L2, and the length of the second weld wire in the second first weld group is (1+0.15)×L2.

[0018] In some embodiments, the acute angle formed by the first weld line and the second weld line in the first weld group is α, where α satisfies: 15°≤α≤45°;

[0019] Any two adjacent first weld groups include a first first weld group close to the first liquid outlet and a second first weld group away from the first liquid outlet. The acute angle formed by the first weld line of the second first weld group and the second weld line of the first first weld group is β, where β satisfies: 10°≤α≤45°.

[0020] In some embodiments, any two adjacent first weld groups include a first first weld group closer to the first liquid outlet and a second first weld group away from the first liquid outlet, wherein the acute angle between the first weld line and the second weld line of the first first weld group is α, and the acute angle between the first weld line and the second weld line of the second first weld group is (α+5°); and / or,

[0021] Any three adjacent first weld groups include a first first weld group close to the first liquid outlet and a second and a third first weld group away from the first liquid outlet. The second first weld group is located between the first and third first weld groups. The acute angle formed by the first weld line of the second first weld group and the second weld line of the first first weld group is β, and the acute angle formed by the first weld line of the third first weld group and the second weld line of the second first weld group is (β+6°).

[0022] In some embodiments, the width of the first bonding wire is K1, where K1 satisfies: 0.1mm ≤ K1 ≤ 0.5mm; and / or,

[0023] The width of the second weld wire is K2, which satisfies the condition: 0.1mm≤K1≤0.5mm.

[0024] A second aspect of this utility model provides a battery including the busbar structure described in the above embodiments.

[0025] Compared with the prior art, the beneficial effects of this utility model include:

[0026] In this invention, a busbar structure is used in a battery. The busbar structure includes a tab portion and a busbar body. The busbar body includes spaced-apart injection holes and a welding area. The welding area has a first solder mark portion for connecting the tab portion. The first solder mark portion includes multiple sets of first solder groups. In the prior art, when the welding temperature of the busbar is too high, it may cause the separator to shrink or break down due to spatter, leading to a short circuit in the battery. In this solution, a portion of the multiple sets of first solder groups can jointly form a first serrated solder mark, which can effectively optimize the welding trajectory, disperse the welding path, and make the heat distribution in the welding area more uniform. Compared with the spiral welding trajectory, which has more overlapping welding trajectories and relatively higher energy concentration, this solution can reduce the situation of local overheating or thermal stress concentration in the busbar structure, thereby reducing welding deformation, welding cracks, and stress generated during the welding process, ensuring the stability and reliability of the welding between the tab portion and the busbar body, and avoiding short circuits in the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a busbar structure in one embodiment of the present invention; wherein, the busbar structure is a positive electrode busbar structure;

[0029] Figure 2 This is a schematic diagram of a busbar structure in one embodiment of the present invention; wherein, the busbar structure is a negative busbar structure;

[0030] Figure 3 This is a schematic diagram of the first welding group in one embodiment of the present invention.

[0031] Explanation of icon numbers:

[0032] Busbar structure 10;

[0033] Manifold body 100; injection hole 110; first liquid outlet hole 111; second liquid outlet hole 112; welding area 120; first weld mark 130; first weld group 140; first weld line 141; second weld line 142; second weld mark 150; second weld group 160; boss 170.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] The first aspect of this utility model provides a busbar structure 10, which is used in a battery and can effectively prevent short circuits during welding. It should be noted that the busbar structure 10 can be used in a multi-tab battery. The following refers to... Figures 1 to 3 The present application will now describe the busbar structure 10 according to an embodiment. Specifically, the busbar structure 10 includes a tab portion and a busbar body 100. The specific arrangement of the tab portion can be referred to in the relevant known technologies of all-tab battery design.

[0037] Reference Figure 1 and Figure 2 The busbar body 100 includes an injection hole 110 and a welding area 120. The injection hole 110 is used to inject electrolyte into the battery from the outside, and during vacuum injection, the injection hole 110 must simultaneously expel gas from inside the battery. The injection hole 110 and the welding area 120 are arranged at intervals, which can effectively avoid deformation or blockage of the injection hole 110 due to welding. The welding area 120 has a first solder mark 130, which is used to connect the tab, enabling welding between the busbar body 100 and the tab.

[0038] Reference Figures 1 to 3 The first solder mark section 130 includes multiple first solder groups 140, and the specific number of first solder groups 140 can be determined according to the actual situation. A portion of the multiple first solder groups 140 can jointly form a first serrated solder mark. It can be understood that the first serrated solder mark is the overall outline of that portion of the first solder group 140.

[0039] In the technical solution of this utility model, a busbar structure 10 is used in a battery. The busbar structure 10 includes a tab portion and a busbar body 100. The busbar body 100 includes spaced-apart injection holes 110 and a welding area 120. The welding area 120 has a first solder mark portion 130, which is used to connect the tab portion. The first solder mark portion 130 includes multiple sets of first solder groups 140. In the prior art, when the welding temperature of the busbar is too high, it may cause the separator to shrink or break down due to spatter, resulting in a short circuit in the battery. In this solution, a portion of the multiple sets of first solder groups 140 can jointly form a first serrated solder mark, which can effectively optimize the welding trajectory, disperse the welding path, and make the heat distribution in the welding area 120 more uniform. Compared to the spiral welding trajectory scheme, which has more overlapping welding trajectories and relatively high energy concentration, this scheme can reduce local overheating or thermal stress concentration in the busbar structure 10, thereby reducing welding deformation, welding cracks and stress generated during welding, ensuring the stability and reliability of the welding between the tab and the busbar body 100, and avoiding short circuits in the battery.

[0040] Reference Figure 1 and Figure 2In some embodiments, another portion of the multiple first welding groups 140 together form a second serrated weld mark. Specifically, in some embodiments, the structure of the second serrated weld mark can be the same as that of the first serrated weld mark. In other embodiments, the structure of the second serrated weld mark can also be different from that of the first serrated weld mark. This application embodiment uses the example of the second serrated weld mark having the same structure as the first serrated weld mark for illustration. The second serrated weld mark and the first serrated weld mark are arranged symmetrically along the radial direction of the busbar body 100. It can be understood that the first serrated weld mark can be combined with the second serrated weld mark to form a Christmas tree-shaped weld mark. Therefore, this solution can further optimize the welding trajectory, disperse the welding path, make the heat distribution in the welding area 120 more uniform, and improve the structural strength and stability of the welding between the busbar body 100 and the electrode tab, thus ensuring battery performance.

[0041] Reference Figure 1 and Figure 2 In some embodiments, the welding area 120 has a second solder mark 150, which is used to connect the tab to improve the stability of the welding between the busbar body 100 and the tab. The second solder mark 150, the first solder mark 130, and the injection hole 110 are all arranged at intervals. Specifically, the second solder mark 150 can be arranged radially opposite to the first solder mark 130 along the busbar body 100, or it can be arranged symmetrically with respect to the center of the busbar. The structure of the second solder mark 150 can be the same as or different from that of the first solder mark 130. By adding the second solder mark 150, this solution can further optimize the welding trajectory, disperse the welding path, make the heat distribution in the welding area 120 more uniform, and improve the structural strength and stability of the welding between the busbar body 100 and the tab, thus ensuring battery performance.

[0042] Reference Figure 1 and Figure 2 The second welding section 150 includes multiple sets of second welding groups 160. The specific arrangement and structure of the second welding groups 160 can be the same as or different from the first welding group 140. A portion of the multiple sets of second welding groups 160 can jointly form a third serrated welding mark. It can be understood that the third serrated welding mark is the overall outline of this portion of the second welding group 160. Another portion of the multiple sets of second welding groups 160 can jointly form a fourth serrated welding mark, which is the overall outline of this portion of the second welding group 160. The third and fourth serrated welding marks are arranged symmetrically along the radial direction of the busbar body 100. The second welding group 160 of this solution includes the third and fourth serrated welding marks, which enables a more uniform heat distribution in the welding area 120 and improves the structural strength and stability of the welding between the busbar body 100 and the electrode tab, ensuring battery performance.

[0043] Reference Figure 1 and Figure 2 The specific configuration of the first welding group 140 is described below. In some embodiments, the first welding group 140 includes a first welding wire 141 and a second welding wire 142, which are arranged alternately, i.e., the first welding wire 141 and the second welding wire 142 are welded intermittently, which can avoid sharp corner accumulation and make the welding heat distribution more uniform. The length of the first welding wire 141 is greater than the length of the second welding wire 142, as shown in the figure. Figure 3 The welding line located on the upper side of the welding group is designated as the first welding line 141, and the welding line located on the lower side of the welding group is designated as the second welding line 142. The first welding line 141 can be arranged at an acute angle to the second welding line 142, and the second welding line 142 of one of the first welding groups 140 can be arranged at an acute angle to the first welding line 141 of the adjacent first welding group 140. This scheme can further optimize the welding trajectory, disperse the welding path, and make the heat distribution in the welding area 120 more uniform.

[0044] Reference Figure 1 and Figure 2 The relative positions of the injection hole 110 and the first welding assembly 140 are described below. In some embodiments, the manifold body 100 is at least partially arc-shaped. Specifically, refer to... Figure 1 The positive busbar can be in the shape of a partially circular arc. (Refer to...) Figure 2 The negative electrode manifold can be circular. The radius of the manifold body 100 is A. The manifold body 100 includes a first drain hole 111 and a second drain hole 112. The first drain hole 111 is located at the center of the manifold, and the second drain hole 112 is located on the side of the manifold. The second drain hole 112 can be single or multiple. This embodiment uses four second drain holes 112 as an example for illustration. It is understood that the structure and dimensions of each second drain hole 112 can be the same or different. (Refer to...) Figure 2 In this embodiment, we will use the example of each second liquid outlet 112 having the same size as an example. It should be noted that the radius of the first liquid outlet 111 is B, and the radius of the second liquid outlet 112 is C.

[0045] Reference Figure 1 and Figure 2 The specific length settings of the first bonding wire 141 and the second bonding wire 142 are described below. In some embodiments, the first bonding wire 141 is located on the side of the second bonding wire 142 facing the first liquid outlet 111, and both the first bonding wire 141 and the second bonding wire 142 can be straight segments. The length of the first bonding wire 141 is L1, where L1 is [√2 × (ABC)]. 2The length of the second welding line 142 is L2, which is [2 / 3L1-1]mm. The first welding line 141 and the second welding line 142 of this scheme adopt the above-mentioned size parameters, which can not only make the heat distribution uniform, but also ensure the welding strength and welding stability of the busbar body 100 and the electrode ear.

[0046] Reference Figure 3 The specific spacing between the first bonding wire 141 and the second bonding wire 142 is described below. In some embodiments, the spacing between the first bonding wire 141 and the second bonding wire 142 is L3, where L3 satisfies the condition: 1mm ≤ L3 ≤ 4mm. For example, L3 can be 1mm, 1.5mm, 2mm, 2.3mm, 2.8mm, 3mm, 3.4mm, 3.7mm, or 4mm, etc. The above-mentioned spacing design between the first bonding wire 141 and the second bonding wire 142 in this solution can avoid heat accumulation caused by the overlap of the first bonding wire 141 and the second bonding wire 142, and also ensure the stability and reliability of the welding between the electrode tab and the busbar body 100.

[0047] Reference Figure 3 The specific configuration of the multiple first welding groups 140 is described below. In some embodiments, any two adjacent first welding groups 140 include a first first welding group 140 closer to the first drain hole 111 and a second first welding group 140 away from the first drain hole 111. The length of the first weld line 141 of the first first welding group 140 is L1, and the length of the first weld line 141 of the second first welding group 140 is (1+0.1)×L1, that is, along the direction from the center of the manifold to the side, the length of the first weld line 141 of each first welding group 140 increases by the same amount. In other embodiments, the length of the second weld line 142 of the first first welding group 140 is L2, and the length of the second weld line 142 of the second first welding group 140 is (1+0.15)×L2, that is, along the direction from the center of the manifold to the side, the length of the second weld line 142 of each first welding group 140 increases by the same amount. The first welding group 140 of this solution adopts the above-mentioned configuration, which means that while avoiding the injection hole 110, the welding area between each liquid outlet hole can be fully utilized to improve the stability and reliability of the welding between the electrode tab and the manifold body 100.

[0048] Reference Figure 3The specific tilting arrangement of the first welding wire 141 and the second welding wire 142 is described below. In some embodiments, the acute angle formed by the first welding wire 141 and the second welding wire 142 in the first welding group 140 is α, where α satisfies: 15°≤α≤45°. For example, α can be 15°, 20°, 24°, 30°, 35°, 38°, or 45°, etc. The above-described arrangement of the first welding wire 141 and the second welding wire 142 in this solution can ensure the stability of the welding between the electrode tab and the busbar body 100, and can prevent heat accumulation and stress concentration.

[0049] Reference Figure 3 The specific distribution of the multiple first welding groups 140 is described below. Any two adjacent first welding groups 140 include a first first welding group 140 closer to the first liquid outlet 111 and a second first welding group 140 away from the first liquid outlet 111. The acute angle β formed by the first weld line 141 of the second first welding group 140 and the second weld line 142 of the first first welding group 140 is β, where β satisfies: 10°≤α≤45°. For example, β can be 10°, 15°, 20°, 26°, 30°, 35°, 40°, or 45°, etc. The above-described arrangement of the multiple first welding groups 140 in this solution ensures the stability of the welding between the electrode tab and the manifold body 100, and prevents heat accumulation and stress concentration.

[0050] Reference Figure 3The specific distribution of multiple first welding groups 140 is described below. In some embodiments, any two adjacent first welding groups 140 include a first first welding group 140 closer to the first drain hole 111 and a second first welding group 140 away from the first drain hole 111. The acute angle formed by the first welding line 141 and the second welding line 142 of the first first welding group 140 is α, and the acute angle formed by the first welding line 141 and the second welding line 142 of the second first welding group 140 is (α+5°), that is, the included angle of the first welding groups 140 increases by an equal amount along the direction from the center of the manifold to the side. In other embodiments, any three adjacent first welding groups 140 include a first first welding group 140 closer to the first drain hole 111, a second first welding group 140 away from the first drain hole 111, and a third first welding group 140, with the second first welding group 140 located between the first and third first welding groups 140. The acute angle between the first weld line 141 of the second first weld group 140 and the second weld line 142 of the first first weld group 140 is β, and the acute angle between the first weld line 141 of the third first weld group 140 and the second weld line 142 of the second first weld group 140 is (β+6°). That is, along the direction from the center of the manifold to the side, the included angle between two adjacent first weld groups 140 increases by the same amount. The above-mentioned arrangement of multiple first weld groups 140 in this scheme allows for full utilization of the weldable area between each liquid outlet while avoiding the liquid injection hole 110, thereby improving the stability and reliability of the welding between the electrode tab and the manifold body 100.

[0051] It should be noted that in some embodiments, as the solder joint angles α and β increase, the welding trajectory approaches a V-shape. Based on a circular area of ​​a certain diameter, the length of the solder line is shorter, resulting in less heat-affected zone or heat accumulation during welding. Furthermore, with the simplified welding trajectory, the welding process is continuous and does not require frequent changes in direction or angle. Parameter design is relatively simple, which can improve welding speed and production efficiency.

[0052] The specific width settings of the first bonding wire 141 and the second bonding wire 142 are described below. In some embodiments, the width of the first bonding wire 141 is K1, where K1 satisfies: 0.1mm ≤ K1 ≤ 0.5mm. For example, K1 can be 0.1mm, 0.2mm, 0.25mm, 0.4mm, 0.48mm, or 0.5mm, etc. In other embodiments, the width of the second bonding wire 142 is K2, where K2 satisfies: 0.1mm ≤ K1 ≤ 0.5mm. For example, K2 can be 0.1mm, 0.15mm, 0.24mm, 0.3mm, 0.35mm, 0.4mm, or 0.5mm, etc. It should be noted that the width of the second bonding wire 142 can be the same as or different from that of the first bonding wire 141, depending on the actual situation. The first welding line 141 and the second welding line 142 of this solution adopt the above-mentioned width setting, which can prevent the welding heat from concentrating and ensure the stability of the welding between the electrode tab and the busbar body 100.

[0053] Reference Figure 1 The following describes the specific parameter settings of the positive electrode busbar structure 10 according to an embodiment of this application. The radius of the busbar body 100 is A, where A = (diameter of the cylindrical cell / 2 - steel shell wall thickness - 0.2). It can be understood that the 0.2 in the parameter limiting A is an empirical tolerance. The radius B of the first liquid discharge hole 111 is 2mm-5mm. Exemplarily, B can be 2mm, 2.5mm, 3.2mm, 4mm, 4.4mm, or 5mm, etc. The radius C of the second liquid discharge hole 112 of the positive electrode busbar, away from its notch, is 1mm-5mm. Exemplarily, C can be 1mm, 1.4mm, 2mm, 3.4mm, 4.5mm, or 5mm, etc. The radius D of the second liquid discharge hole 112 of the positive electrode busbar, adjacent to its notch, is 0.8mm-3mm. Exemplarily, D can be 0.8mm, 1mm, 1.5mm, 1.8mm, 2mm, 2.5mm, or 3mm, etc. (Refer to...) Figure 1 The length of the tab end of the positive busbar body 100 is E, where E is 3 / 4A. It should be noted that the distance between the welding area 120 of the busbar structure 10 and its edge can be less than or equal to 1mm.

[0054] Reference Figure 2The following describes the specific parameter settings of the negative electrode busbar structure 10 according to an embodiment of this application. The radius of the busbar body 100 is A, where A = (diameter of the cylindrical cell / 2 - steel shell wall thickness - 0.2). It can be understood that the 0.2 in the parameter limiting A is an empirical tolerance. The radius B of the first liquid outlet 111 is 2mm-5mm. Exemplarily, B can be 2mm, 2.5mm, 3.2mm, 4mm, 4.4mm, or 5mm, etc. The radius H of the boss 170 is 1 / 6A-1 / 4A. Exemplarily, H can be 1 / 6A, 1 / 5A, or 1 / 4A, etc. The height I of the boss 170 is 0.05mm-5mm. Exemplarily, I can be 0.05mm, 0.1mm, 0.25mm, 0.3mm, 0.48mm, or 5mm, etc. It should be noted that the distance between the welding area 120 of the busbar structure 10 and its edge can be less than or equal to 1mm.

[0055] It should be noted that in some embodiments, to ensure welding quality and electrode adhesion during welding, the core design uses a 1.0μm-4.0μm PVDF composite alumina coated separator, and a 25μm-200μm aramid coating is applied to one side of the contact surface between the busbar and the core. Aramid possesses excellent high-temperature resistance, mechanical strength, and chemical stability. The aramid-coated separator is not easily deformed at high temperatures, effectively reducing the risk of battery thermal runaway and preventing short circuits caused by heat effects from welding that could damage the separator.

[0056] The specific welding setup of the busbar structure 10 according to an embodiment of this application is described below. In some embodiments, the busbar is welded using a designed positive and negative electrode welding method, employing a 1.0μm-4.0μm PVDF composite alumina coated diaphragm and a single-sided coated 25μm-200μm aramid busbar. After welding, the diaphragm remains undamaged. The PVDF coating provides good wettability and electrolyte retention of the electrode, effectively absorbing and retaining the electrolyte, improving the electrolyte diffusion between the diaphragm and the electrode, optimizing the electrolyte's ion transport performance, and reducing the cell's internal resistance.

[0057] The specific welding setup of the proportional busbar structure 10 of this application is described below. In some embodiments, conventional pulse spot welding is used, with 10 weld points connected at each of the four welding positions, using a base membrane and an uncoated busbar (other specifications are the same). After welding, the diaphragm may experience probabilistic damage (dents or shrinkage), resulting in a high internal resistance.

[0058] A second aspect of this utility model provides a battery, which includes a busbar structure 10 as described in the above embodiment. This solution can reduce local overheating or thermal stress concentration in the busbar structure 10, thereby reducing welding deformation, welding cracks, and stress generated during welding, ensuring the stability and reliability of the welding between the tab and the busbar body 100, and preventing short circuits in the battery.

[0059] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0060] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0061] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A busbar structure for a battery, characterized in that, The busbar structure includes: Extreme ear area; The manifold body includes spaced-apart injection holes and a welding area, wherein the welding area has a first solder mark, which is used to connect the electrode tab. The first solder mark includes multiple first solder groups, and a portion of the multiple first solder groups together form a first serrated solder mark.

2. The busbar structure as described in claim 1, characterized in that, The other part of the first welding group in the multiple first welding groups together form a second serrated welding mark, and the second serrated welding mark and the first serrated welding mark are arranged symmetrically along the radial direction of the manifold body.

3. The busbar structure as described in claim 1, characterized in that, The welding area has a second welding mark spaced apart from the first welding mark, the second welding mark being used to connect the electrode tab, and the second welding mark including multiple sets of second welding groups; A portion of the second welding groups together form a third serrated weld mark, and another portion of the second welding groups together form a fourth serrated weld mark. The third serrated weld mark and the fourth serrated weld mark are arranged symmetrically along the radial direction of the manifold body.

4. The busbar structure as described in claim 1, characterized in that, The first welding group includes a first welding line and a second welding line arranged at intervals. The first welding line and the second welding line are arranged at an acute angle, and the second welding line of the first welding group is arranged at an acute angle to the first welding line of the adjacent first welding group. The length of the first welding line is greater than the length of the second welding line.

5. The busbar structure as described in claim 4, characterized in that, The manifold body is at least partially arc-shaped, the radius of the manifold body is A, the manifold body includes a first liquid outlet located at the center and a second liquid outlet located on the side, the radius of the first liquid outlet is B, and the radius of the second liquid outlet is C. The first weld wire is located on the side of the second weld wire facing the first liquid outlet, and the length of the first weld wire is L1, where L1 is [√2×(ABC)]. 2 -0.8]mm, the length of the second bonding wire is L2, L2 is [2 / 3L1-1]mm, the distance between the first bonding wire and the second bonding wire is L3, L3 satisfies: 1mm≤L3≤4mm.

6. The busbar structure as described in claim 5, characterized in that, Any two adjacent first weld groups include a first first weld group closer to the first liquid outlet and a second first weld group away from the first liquid outlet; and, The length of the first weld wire in the first first weld group is L1, and the length of the first weld wire in the second first weld group is (1+0.1)×L1; and / or, The length of the second weld wire in the first first weld group is L2, and the length of the second weld wire in the second first weld group is (1+0.15)×L2.

7. The busbar structure as described in claim 4, characterized in that, The acute angle formed by the first weld line and the second weld line in the first weld group is α, and α satisfies: 15°≤α≤45°; Any two adjacent first weld groups include a first first weld group close to the first liquid outlet and a second first weld group away from the first liquid outlet. The acute angle formed by the first weld line of the second first weld group and the second weld line of the first first weld group is β, where β satisfies: 10°≤α≤45°.

8. The busbar structure as described in claim 4, characterized in that, Any two adjacent first weld groups include a first first weld group closer to the first liquid outlet and a second first weld group away from the first liquid outlet. The acute angle between the first weld line and the second weld line of the first first weld group is α, and the acute angle between the first weld line and the second weld line of the second first weld group is (α+5°); and / or, Any three adjacent first weld groups include a first first weld group close to the first liquid outlet and a second and a third first weld group away from the first liquid outlet. The second first weld group is located between the first and third first weld groups. The acute angle formed by the first weld line of the second first weld group and the second weld line of the first first weld group is β, and the acute angle formed by the first weld line of the third first weld group and the second weld line of the second first weld group is (β+6°).

9. The busbar structure as described in claim 4, characterized in that, The width of the first bonding wire is K1, where K1 satisfies: 0.1mm ≤ K1 ≤ 0.5mm; and / or, The width of the second weld wire is K2, which satisfies the condition: 0.1mm≤K1≤0.5mm.

10. A battery, characterized in that, Includes the busbar structure as described in any one of claims 1-9.

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