Welding tool

Abstract

The utility model belongs to the technical field of batteries, and discloses a welding tool which is used for welding battery cell tabs. The welding tool comprises a top clamp. The top clamp is provided with a welding channel, one end, close to the tab, of the welding channel is a first welding window, and one side, close to the tab, of the top clamp is further provided with a first tab glue protection groove; during welding, the to-be-welded area is located in the first welding window, and the tab film is located in the first tab film protection groove. The tab glue is located in the first tab glue protection groove, and the to-be-welded area is located in the first welding window, so that welding slag can only fall into the welding channel or the current collector instead of falling onto the tab glue, and faults such as electric leakage and short circuit of a battery cell caused by the fact that the welding slag falls onto the tab glue are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a welding tool. Background Art

[0002] During the assembly process of soft-pack batteries, the current collector and the cell tabs are usually connected by laser welding to achieve connection and current conduction between the inside and outside of the cell. Tab glue is an important component of the battery. Its main function is to hot-melt seal and bond with the aluminum-plastic film during packaging to prevent battery leakage. At the same time, it also has a certain degree of insulation to prevent leakage and short circuit faults between the metal strip and the aluminum-plastic film. During the welding process of the current collector and the tab, if the welding slag splashes onto the tab glue, it is easy to cause a short circuit after the cell is packaged, and the resistance value between the aluminum-plastic film and the tab is too low, and other quality problems. Therefore, the tab glue needs to be protected during the welding process to prevent welding slag from splashing onto the tab glue.

[0003] The existing welding tooling can usually only facilitate the welding process, but cannot protect the tab glue and cannot prevent welding slag from splashing onto the tab glue.

[0004] Therefore, it is urgent to propose a welding tool to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a welding tool, which can effectively prevent welding slag generated during welding from splashing onto the ear glue, thereby avoiding the problem of battery short circuit or too low resistance value caused by welding slag splashing.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A welding tool, used for welding a battery cell tab, comprising:

[0008] A top clamp, wherein the top clamp is provided with a welding channel, an end of the welding channel close to the pole ear is a first welding window, and a side of the top clamp close to the pole ear is also provided with a first pole ear glue protection groove;

[0009] During welding, the area to be welded is located in the first welding window, and the tab glue is located in the first tab glue protection groove.

[0010] Optionally, a first shielding gas inlet is provided on the top clamp, the first shielding gas inlet is communicated with the welding channel, and the first shielding gas inlet is used to introduce shielding gas.

[0011] Optionally, a first dust suction port is provided on the top clamp, the first dust suction port is connected to the welding channel, and the first dust suction port is used to suck out welding slag.

[0012] Optionally, a first compression rib is provided on the edge of the first welding window.

[0013] Optionally, the cross-sectional area of ​​the welding channel gradually decreases from a direction away from the pole lug to a direction close to the pole lug.

[0014] Optionally, the welding tool also includes a base, the base has a second welding window and a welding avoidance cavity, the second welding window and the welding avoidance cavity are connected, the pole ear can be clamped between the top clamp and the base, and during welding, the area to be welded is located in the second welding window.

[0015] Optionally, a second tab glue protection groove is provided on the base, and the second tab glue protection groove and the second welding window are both located on a side of the base close to the tab, and during welding, the tab glue is located in the second tab glue protection groove.

[0016] Optionally, a second pressing rib is provided on the edge of the second welding window.

[0017] Optionally, a second shielding gas inlet is provided on the base, the second shielding gas inlet is communicated with the welding avoidance cavity, and the second shielding gas inlet is used for introducing shielding gas.

[0018] Optionally, a second dust suction port is provided on the base, the second dust suction port is connected to the welding avoidance cavity, and the second dust suction port is used to suck out welding slag.

[0019] Optionally, the cross-sectional area of ​​the base gradually decreases from a direction away from the pole lug to a direction close to the pole lug.

[0020] Beneficial effects:

[0021] When the welding tool provided by the utility model is used, the current collector is placed on the pole ear, and the first welding window is placed right at the area to be welded, and the pole ear glue is just located in the first pole ear glue protection groove. The current collector and the pole ear are welded through the welding channel. Since the pole ear glue is located in the first pole ear glue protection groove and the area to be welded is located in the first welding window, the welding slag can only fall into the welding channel or on the current collector, and will not fall on the pole ear glue, thereby effectively preventing the welding slag from falling on the pole ear glue and causing battery leakage and short circuit and other faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of the top clamp provided in the first embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the assembly of the welding tool and the battery cell provided in the first embodiment of the utility model;

[0025] Figure 3 It is a cross-sectional schematic diagram of the welding tool and the battery cell provided in the first embodiment of the utility model;

[0026] Figure 4 This is an exploded view of the welding tool and the battery cell provided in the first embodiment of the utility model;

[0027] Figure 5 It is a structural schematic diagram of a base provided in Embodiment 1 of the present utility model.

[0028] In the figure:

[0029] 10. Battery cell; 11. Tab; 12. Tab glue;

[0030] 100, top clamp; 101, welding channel; 102, welding avoidance port; 103, first welding window; 104, first ear glue protection groove; 105, first protective gas inlet; 106, first dust suction port; 107, first pressing rib;

[0031] 200, base; 201, second welding window; 202, second electrode ear glue protection groove; 203, second pressing rib; 204, welding avoidance cavity; 205, second protective gas inlet; 206, second dust suction port. DETAILED DESCRIPTION

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] Embodiment 1

[0037] See also Figure 1 and Figure 2 The present embodiment provides a welding tool for welding the tab 11 of the battery cell 10. The welding tool includes a top clamp 100. The top clamp 100 is provided with a welding channel 101, and one end of the welding channel 101 close to the tab 11 is a first welding window 103, and a first tab glue protection groove 104 is also provided on one side of the top clamp 100 close to the tab 11; during welding, the area to be welded is located in the first welding window 103, and the tab glue 12 is located in the first tab glue protection groove 104.

[0038] When the welding tool is used, the current collector is placed on the pole ear 11, and the first welding window 103 is placed opposite to the area to be welded, and the pole ear glue 12 is just located in the first pole ear glue protection groove 104. The current collector and the pole ear 11 are welded through the welding channel 101. Since the pole ear glue 12 is located in the first pole ear glue protection groove 104, and the area to be welded is located in the first welding window 103, the welding slag can only fall into the welding channel 101 or on the current collector, and will not fall on the pole ear glue 12, thereby effectively preventing the welding slag from falling on the pole ear glue 12 and causing leakage and short circuit of the battery cell 10.

[0039] Furthermore, one end of the welding channel 101 away from the electrode tab is a welding avoidance opening 102 . In this embodiment, laser welding is used to weld the electrode tab 11 and the current collector, and the laser enters from the welding avoidance opening 102 .

[0040] Furthermore, a first shielding gas inlet 105 is provided on the top clamp 100 . The first shielding gas inlet 105 is communicated with the welding channel 101 . The first shielding gas inlet 105 is used to introduce shielding gas.

[0041] The protective gas has a cooling effect to prevent the temperature in the top fixture 100 from being too high. In this embodiment, the protective gas is nitrogen. Optionally, the flow rate of the protective gas is greater than or equal to 18m / s, and can be 19m / s, 20m / s, 21m / s, or 22m / s, etc.

[0042] The top clamp 100 is provided with a first dust suction port 106 , which is communicated with the welding channel 101 , and is used for sucking out welding slag.

[0043] Optionally, the first suction port 106 is connected to a dust collection device, so that the welding slag generated during welding can be sucked away to prevent the welding slag from accumulating. Optionally, the dust collection device can be a central dust collector in a factory. Optionally, the wind speed at the first suction port 106 is greater than or equal to 26 m / s, and can be 26 m / s, 27 m / s, 28 m / s or 29 m / s, etc.

[0044] Furthermore, a first pressing rib 107 is provided on the edge of the first welding window 103 .

[0045] In this embodiment, the cross-sectional shape of the first welding window 103 is a rectangle, and therefore, the shape of the first compression rib 107 is a square. The first compression rib 107 is used to compress the edge of the welding area, increase the sealing of the edge of the first welding window 103, and prevent the protective gas from carrying welding slag into the first pole ear glue protection groove 104 or invading the pole ear glue 12 during welding. Optionally, the surface of the first compression rib 107 is coated with silicone or Teflon, which has certain elasticity, sealing performance and corrosion resistance. Optionally, the thickness of the first compression rib 107 is 0.3mm to 2.0mm, and the width is 1mm to 2mm. Exemplarily, the thickness of the first compression rib 107 is 0.3mm, 0.8mm, 1.5mm or 2mm, etc., and the width is 1mm, 1.5mm or 2mm, etc. Optionally, a first convex ridge is provided at the edge of the first welding window 103, the cross-sectional shape of the first pressing rib 107 is a U-shaped shape, and the first pressing rib 107 is sleeved on the first convex ridge. Optionally, the first pressing rib 107 and the first convex ridge are bonded and fixed to effectively prevent the first pressing rib 107 from falling off from the first convex ridge during welding or movement.

[0046] Further, see Figure 3 The cross-sectional area of ​​the welding channel 101 gradually decreases from the direction away from the pole lug 11 to the direction close to the pole lug 11 .

[0047] In this embodiment, the longitudinal cross-section of the welding channel 101 is trapezoidal, and the area of ​​the welding avoidance opening 102 is larger than the area of ​​the first welding window 103. This structural form can increase the incident amount of laser and focus the laser on the welding area on the current collector, ensuring that the current collector and the tab 11 are firmly welded.

[0048] Further, see Figures 3 to 5 The welding tool also includes a base 200, which has a second welding window 201 and a welding avoidance cavity 204. The second welding window 201 and the welding avoidance cavity 204 are connected. The tab 11 can be clamped between the top clamp 100 and the base 200. During welding, the area to be welded is located in the opening of the second welding window 201.

[0049] The base 200 is located below the tab 11, and the base 200 supports the tab 11. It can be understood that the first welding window 103 and the second welding window 201 are both directly opposite to the area to be welded, so the first welding window 103 and the second welding window 201 are preferably the same in size and shape. By providing the second welding window 201 and the welding avoidance cavity 204, the laser can penetrate the area to be welded, effectively improving the welding quality.

[0050] Furthermore, a second tab glue protection groove 202 is provided on the base 200. Both the second tab glue protection groove 202 and the second welding window 201 are located on the side of the base 200 close to the tab 11. During welding, the tab glue 12 is located within the second tab glue protection groove 202.

[0051] Understandably, when the tab 11 is placed on the base 200, the tab glue 12 is located at the second tab glue protection groove 202. After the top fixture 100 is placed on the base 200, the positions of the first tab glue protection groove 104 and the second tab glue protection groove 202 are aligned.

[0052] Furthermore, a second pressing rib 203 is provided at the edge of the second welding window 201.

[0053] Optionally, the structure and material of the second pressing rib 203 are the same as those of the first pressing rib 107. The provision of the second pressing rib 203 ensures that the tab 11 is pressed between the first pressing rib 107 and the second pressing rib 203, providing good sealing performance and preventing welding slag from invading the tab glue 12 through the gap at the welding window. Optionally, a second convex rib is provided at the edge of the second welding window 201. The cross-sectional shape of the second pressing rib 203 is a U-shaped, and the second pressing rib 203 is sleeved on the second convex rib. Optionally, the second pressing rib 203 and the second convex rib are adhesively fixed to effectively prevent the second pressing rib 203 from falling off the second convex rib during welding or movement.

[0054] Furthermore, a second protective gas inlet 205 is provided on the base 200. The second protective gas inlet 205 is in communication with the welding avoidance cavity 204, and the second protective gas inlet 205 is used to introduce protective gas.

[0055] By introducing protective gas into the welding avoidance cavity 204 through the second protective gas inlet 205, the base 200 can be effectively cooled to prevent the temperature of the base 200 from being too high. Optionally, the second protective gas can be nitrogen. The types of the second protective gas and the first protective gas can be the same or different, and can be selected according to the usage requirements.

[0056] Furthermore, a second dust suction port 206 is provided on the base 200. The second dust suction port 206 is in communication with the welding avoidance cavity 204, and the second dust suction port 206 is used to suck out welding slag.

[0057] The second dust suction port 206 is in communication with a dust suction device to suck away the welding slag that falls into the welding avoidance cavity 204 during welding, preventing the accumulation of welding slag.

[0058] Furthermore, in the direction from away from the tab 11 to close to the tab 11 of the base 200, the cross-sectional area gradually decreases.

[0059] The base 200 adopts this structural form to increase its stability and prevent it from tipping over during use. For example, the cross-sectional area of ​​the base 200 in the vertical direction is approximately a right-angled trapezoid or an isosceles trapezoid.

[0060] Embodiment 2

[0061] The similarities between this embodiment and the first embodiment are not described in detail. Only the differences between this embodiment and the first embodiment are described below:

[0062] In this embodiment, a first connecting portion is provided on the circumference of the bottom of the top clamp 100, and a second connecting portion is provided on the circumference of the top of the base 200. The first connecting portion is provided with a positioning column extending toward the bottom, and the second connecting portion is provided with a positioning groove, and the positioning column can be plugged into the positioning groove.

[0063] By setting the positioning column and the positioning groove, when installing the top clamp 100 and the base 200, the positioning column is inserted into the positioning groove to align the top clamp 100 and the base 200, thereby ensuring that the first welding window 103 and the second welding window 201 and the first clamping rib 107 and the second clamping rib 203 are opposite to each other, thereby ensuring the sealing around the area to be welded.

[0064] Furthermore, threaded holes are provided on the first connection part and the second connection part, and the first connection part and the second connection part are detachably connected by bolts. During the welding process, the first connection part and the second connection part are locked and fixed by bolts to prevent the top clamp 100 and the base 200 from loosening during the welding process, resulting in gaps around the area to be welded.

[0065] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A welding tool for welding a tab (11) of a battery cell (10), characterized in that: include: A top clamp (100), wherein the top clamp (100) is provided with a welding channel (101), one end of the welding channel (101) close to the pole lug (11) is a first welding window (103), and a side of the top clamp (100) close to the pole lug (11) is also provided with a first pole lug glue protection groove (104); During welding, the area to be welded is located in the first welding window (103), and the tab glue (12) is located in the first tab glue protection groove (104).

2. The welding tool according to claim 1, characterized in that: The top clamp (100) is provided with a first shielding gas inlet (105), the first shielding gas inlet (105) is connected to the welding channel (101), and the first shielding gas inlet (105) is used to introduce shielding gas.

3. The welding tool according to claim 1, characterized in that: The top clamp (100) is provided with a first dust suction port (106), the first dust suction port (106) is connected to the welding channel (101), and the first dust suction port (106) is used to suck out welding slag.

4. The welding tool according to claim 1, characterized in that: A first pressing rib (107) is provided at the edge of the first welding window (103).

5. The welding tool according to claim 1, characterized in that: The cross-sectional area of ​​the welding channel (101) gradually decreases from a direction away from the pole lug (11) to a direction close to the pole lug (11).

6. The welding tool according to any one of claims 1 to 5, characterized in that: The welding tool also includes a base (200), the base (200) having a second welding window (201) and a welding avoidance cavity (204), the second welding window (201) and the welding avoidance cavity (204) being connected, the pole ear (11) can be clamped between the top clamp (100) and the base (200), and during welding, the area to be welded is located in the second welding window (201).

7. The welding tool according to claim 6, characterized in that: The base (200) is provided with a second tab glue protection groove (202), the second tab glue protection groove (202) and the second welding window (201) are both located on a side of the base (200) close to the tab (11), and during welding, the tab glue (12) is located in the second tab glue protection groove (202).

8. The welding tool according to claim 6, characterized in that: A second pressing rib (203) is provided at the edge of the second welding window (201).

9. The welding tool according to claim 6, characterized in that: The base (200) is provided with a second protective gas inlet (205), the second protective gas inlet (205) is communicated with the welding avoidance cavity (204), and the second protective gas inlet (205) is used for introducing protective gas.

10. The welding tool according to claim 6, characterized in that: The base (200) is provided with a second dust suction port (206), the second dust suction port (206) is connected to the welding avoidance chamber (204), and the second dust suction port (206) is used to suck out welding slag.

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