Peripheral welding jig suitable for lithium battery

Abstract

The periphery welding jig suitable for the lithium battery comprises an annular shell, and a nitrogen channel and a first negative pressure vacuum channel which are independent of each other are arranged on the annular shell. The annular shell is used for surrounding the outer side of a lithium battery; the nitrogen channel comprises a nitrogen pipeline connector, a nitrogen cavity and a nitrogen outlet which are sequentially arranged and communicate with one another. The nitrogen outlet is formed in one side, close to the lithium battery, of the annular shell; the first negative pressure vacuum passage comprises a first dust removal pipeline interface, a first dust removal gas cavity and a first dust removal gas inlet which are arranged in sequence and are communicated with one another; the first dust removal gas inlet is formed in one side, close to the lithium battery, of the annular shell. According to the utility model, the nitrogen passage and the dust removal pipeline (namely the first negative pressure vacuum passage) are integrated, and the peripheral welding jig is integrally annular and can surround the outer side of the lithium battery to be welded, so that the welding effect can be improved, and the welding qualification rate can be increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to welding fixture technical field, concretely relates to a kind of periphery welding fixture suitable for lithium battery. BACKGROUND

[0002] In the cover plate periphery welding process of traditional square battery, collimation head welding mode is often used, inert gas (such as nitrogen etc.) is needed to protect welding surface to prevent oxidation during welding process, and large metal dust and smoke will be generated during welding process, and corresponding dust removal pipeline needs to be configured.Under collimation head welding mode, nitrogen pipeline and dust removal pipeline are synchronously moved with collimation head, to provide nitrogen and negative pressure dust removal simultaneously while welding.In order to further improve welding efficiency, galvanometer welding mode needs to be used, nitrogen pipeline and dust removal pipeline cannot be installed on galvanometer head, therefore, welding quality is greatly limited to improve. SUMMARY

[0003] For the above problems, the utility model provides a kind of periphery welding fixture suitable for lithium battery, nitrogen passage and dust removal pipeline are integrated into one, and the whole periphery welding fixture is annular, can be wrapped in the outside of lithium battery to be welded, can improve welding effect and improve welding qualified rate.

[0004] In order to realize the above technical purpose, achieve the above technical effect, the utility model realizes by following technical scheme:

[0005] A kind of periphery welding fixture suitable for lithium battery, including annular shell, nitrogen passage and first negative pressure vacuum passage are independently arranged on the annular shell;

[0006] The annular shell is used to surround the outside of lithium battery;

[0007] Nitrogen passage includes nitrogen pipeline interface, nitrogen cavity and nitrogen outlet sequentially arranged and interconnected;The nitrogen outlet is arranged on the side of annular shell close to lithium battery;

[0008] First negative pressure vacuum passage includes first dust removal pipeline interface, first dust removal gas cavity and first dust removal air inlet sequentially arranged and interconnected, and the first dust removal air inlet is arranged on the side of annular shell close to lithium battery.

[0009] In the above scheme, by integrating the nitrogen passage and the dust removal pipeline (i.e. the first negative pressure vacuum passage) into one, the peripheral welding jig as a whole is annular, which can surround the outside of the lithium battery to be welded, so as to improve the welding effect and improve the welding qualification rate. Specifically, the first negative pressure vacuum passage is used to discharge the metal dust, smoke and the like generated during welding; the nitrogen passage is used to introduce nitrogen into the welding area to prevent the welding surface from being oxidized. The nitrogen passes through the nitrogen pipeline interface, the nitrogen cavity and the nitrogen outlet in sequence and finally reaches the welding surface; the metal dust, smoke and the like generated during welding pass through the first dust removal gas inlet, the first dust removal gas cavity and the first dust removal pipeline interface in sequence and are then discharged.

[0010] Optionally, the peripheral welding jig further comprises a second negative pressure vacuum passage, the second negative pressure vacuum passage comprising a second dust removal pipeline interface, a second dust removal gas cavity and a second dust removal gas inlet arranged in sequence and in communication with each other, and the second dust removal gas inlet is arranged on one side of the annular shell close to the lithium battery.

[0011] In the above scheme, by providing two negative pressure vacuum passages, the metal dust, smoke and the like generated during welding can be effectively discharged, so as to prevent the welding dust from spreading upwards or downwards of the nitrogen passage.

[0012] Optionally, the nitrogen passage is located between the first negative pressure vacuum passage and the second negative pressure vacuum passage in the vertical direction.

[0013] In the above scheme, if the metal dust, smoke and the like generated during welding spread upwards, they pass through the first dust removal gas inlet, the first dust removal gas cavity and the first dust removal pipeline interface in the first negative pressure vacuum passage in sequence and are then discharged; if the metal dust, smoke and the like generated during welding spread downwards, they pass through the second dust removal gas inlet, the second dust removal gas cavity and the second dust removal pipeline interface in the second negative pressure vacuum passage in sequence and are then discharged.

[0014] Optionally, the nitrogen outlet, the first dust removal gas inlet and the second dust removal gas inlet are respectively in the shape of a slit, a circular hole, a grid, a slit-circular hole alternately distributed shape, a slit-grid alternately distributed shape or a circular hole-grid alternately distributed shape.

[0015] In the above scheme, a plurality of shapes of the nitrogen outlet, the first dust removal gas inlet and the second dust removal gas inlet are provided, which can be selected according to actual conditions in actual use.

[0016] Optionally, when the nitrogen outlet, the first dust removal gas inlet or the second dust removal gas inlet is in the shape of a circular hole or a grid, the number of the nitrogen outlet, the first dust removal gas inlet or the second dust removal gas inlet is greater than 1, and each nitrogen outlet, first dust removal gas inlet or second dust removal gas inlet is arranged annularly along one side of the annular shell close to the lithium battery.

[0017] In the scheme, when the nitrogen outlet, the first dust removal gas inlet or the second dust removal gas inlet is in a circular hole shape or a grid shape, the uniformity of the nitrogen outlet speed of the nitrogen outlet and the uniformity of the gas inlet speed of the first dust removal gas inlet or the second dust removal gas inlet can be improved.

[0018] Optionally, the nitrogen outlet, the first dust removal gas inlet or the second dust removal gas inlet is in an annular slit shape.

[0019] In the scheme, when the nitrogen outlet, the first dust removal gas inlet or the second dust removal gas inlet is in an annular slit shape, the structure is simple, and the generation and manufacturing are facilitated.

[0020] Optionally, the peripheral welding jig further comprises a third negative pressure vacuum passage, the third negative pressure vacuum passage comprises a third dust removal pipeline interface, a third dust removal gas cavity and a third dust removal gas inlet which are sequentially arranged and communicated with each other, and the third dust removal gas inlet is arranged on one side of the annular shell close to the lithium battery.

[0021] In the scheme, the metal dust and smoke generated by welding are discharged by the first negative pressure vacuum passage, the second negative pressure vacuum passage and the third negative pressure vacuum passage, so that the metal dust and smoke generated by welding cannot be completely absorbed.

[0022] Optionally, the third negative pressure vacuum passage is located above the first negative pressure vacuum passage or below the second negative pressure vacuum passage.

[0023] In the scheme, the specific arrangement of the first negative pressure vacuum passage, the second negative pressure vacuum passage and the third negative pressure vacuum passage is limited, and in actual use, it can be selected according to actual conditions.

[0024] Optionally, the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet and the third dust removal gas inlet are respectively in a slit shape, a circular hole shape, a grid shape, a slit-circular hole alternating distribution shape, a slit-grid alternating distribution shape or a circular hole-grid alternating distribution shape.

[0025] In the scheme, a plurality of shapes of the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet and the third dust removal gas inlet are provided, and in actual use, they can be selected according to actual conditions.

[0026] Optionally, when the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet or the third dust removal gas inlet is in a circular hole shape or a grid shape, the number of the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet or the third dust removal gas inlet is greater than 1, and each nitrogen outlet, first dust removal gas inlet, second dust removal gas inlet or third dust removal gas inlet is arranged in a ring shape along one side of the annular shell close to the lithium battery.

[0027] In the scheme, when the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet or the third dust removal gas inlet is in the shape of a circular hole or a grid, the uniformity of the nitrogen outlet speed of nitrogen at the nitrogen outlet and the uniformity of the inlet speed at the first dust removal gas inlet or the second dust removal gas inlet can be improved.

[0028] Optionally, the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet or the third dust removal gas inlet is in the shape of an annular slit.

[0029] In the scheme, when the nitrogen outlet, the first dust removal gas inlet, the second dust removal gas inlet or the third dust removal gas inlet is in the shape of an annular slit, the structure is simple, and the generation and manufacturing are facilitated.

[0030] Compared with the prior art, the utility model has the advantages of:

[0031] In the utility model, the nitrogen passage and the dust removal pipeline are integrated, the whole periphery welding jig is in the shape of a ring, can be surrounded on the outside of the lithium battery to be welded, the welding effect can be improved, and the welding qualified rate is improved. Specifically, the first negative pressure vacuum passage is used for discharging metal dust, smoke and the like generated in welding;The nitrogen passage is used for introducing nitrogen into the welding area to prevent the welding surface from being oxidized. Nitrogen reaches the welding surface finally through the nitrogen pipeline interface, the nitrogen cavity and the nitrogen outlet in sequence;The metal dust, smoke and the like generated in welding are discharged after passing through the first dust removal gas inlet, the first dust removal gas cavity and the first dust removal pipeline interface in sequence. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to make the content of the utility model more easily and clearly understood, the utility model will be further described in detail below according to specific embodiments and in conjunction with the drawings, wherein:

[0033] Figure 1 is a structure schematic view of a square battery in the embodiment 1 of the utility model;

[0034] Figure 2 is Figure 1 a partial sectional view of A-A in the embodiment 1 of the utility model;

[0035] Figure 3 is a state schematic view of the periphery welding jig in the embodiment 1 of the utility model when being applied to battery welding;

[0036] Figure 4 is Figure 3 a partial sectional view of B-B in the embodiment 1 of the utility model;

[0037] Figure 5 is a front sectional view of the periphery welding jig in the embodiment 1 of the utility model;

[0038] Figure 6is the schematic diagram of airflow direction of the peripheral welding jig in the embodiment 1 of the utility model in the welding process;

[0039] Figure 7 is the structural schematic diagram of the peripheral welding jig in the embodiment 2 of the utility model;

[0040] Figure 8 is Figure 7 the partial sectional view of C-C in the embodiment 2 of the utility model;

[0041] Figure 9 is the partial sectional view of the peripheral welding jig in the embodiment 2 of the utility model;

[0042] Figure 10 is the structural schematic diagram of the peripheral welding jig in the embodiment 3 of the utility model;

[0043] Figure 11 is the front view of the peripheral welding jig in the embodiment 3 of the utility model;

[0044] Figure 12 is Figure 10 the partial sectional view of D-D in the embodiment 3 of the utility model;

[0045] wherein:

[0046] 10-shell, 20-cover, 30-peripheral welding jig, 301-nitrogen pipeline interface, 302-first dust removal pipeline interface, 303-nitrogen cavity, 304-first dust removal gas cavity, 305-nitrogen outlet, 306-first dust removal air inlet, 307-second dust removal pipeline interface, 308-second dust removal gas cavity, 309-second dust removal air inlet, 310-third dust removal pipeline interface, 311-third dust removal gas cavity, 312-third dust removal air inlet, 313-annular shell. DETAILED DESCRIPTION

[0047] In order to make the utility model purposes, technical scheme and advantages more clearly, the following is combined with embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the protection scope of the utility model.

[0048] In the description of the utility model patent, it should be explained that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "horizontal" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model patent and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model patent.

[0049] In the description of the utility model patent, it needs to be explained that, unless there is explicit provision and limitation, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0050] The application principle of the utility model is described in detail below in combination with the drawings. Example 1

[0051] As Figure 1 The structure diagram of the square battery in the prior art is shown, the peripheral welding jig 30 for the welding process of the square battery, the square battery includes the shell 10 and the cover plate 20, the cover plate 20 is buckled into the shell 10, and the two are welded together by laser, as Figure 2 Indicated.

[0052] A peripheral welding jig suitable for lithium battery is provided in the embodiment, as Figures 3-5 Indicated, including annular shell 313, the annular shell 313 is provided with independent nitrogen passage and first negative pressure vacuum passage;In the specific implementation process, the nitrogen passage is located in the upper layer or lower layer of the first negative pressure vacuum passage, and the spatial relationship between the two is upper and lower relationship;

[0053] The annular shell 313 is used for surrounding the outside of lithium battery;

[0054] The nitrogen passage includes nitrogen pipeline interface 301, nitrogen cavity 303 and nitrogen outlet 305 arranged in sequence and communicated with each other;The nitrogen outlet 305 is arranged on the annular shell 313 close to one side of lithium battery;In the specific implementation process, the nitrogen pipeline interface 301 is arranged on the outer surface of the annular shell 313 away from lithium battery or other positions;

[0055] The first negative pressure vacuum passage includes first dust removal pipeline interface 302, first dust removal gas cavity 304 and first dust removal gas inlet 306 arranged in sequence and communicated with each other, and the first dust removal gas inlet 306 is arranged on the annular shell 313 close to one side of lithium battery, and in the specific implementation process, the first dust removal pipeline interface 302 is arranged on the outer surface of the annular shell 313 away from lithium battery or other positions.

[0056] In the above scheme, by integrating the nitrogen passage and the dust removal pipeline into one, the peripheral welding jig is annular as a whole, which can surround the outside of the lithium battery to be welded, so as to improve the welding effect and improve the welding qualification rate. Specifically, the first negative pressure vacuum passage is used to discharge the metal dust, smoke and the like generated during welding; the nitrogen passage is used to introduce nitrogen into the welding area to prevent the welding surface from being oxidized. The nitrogen passes through the nitrogen pipeline interface 301, the nitrogen cavity 303 and the nitrogen outlet 305 in turn and finally reaches the welding surface; the metal dust, smoke and the like generated during welding pass through the first dust removal inlet 306, the first dust removal gas cavity 304 and the first dust removal pipeline interface 302 in turn and are discharged, for details, see Figure 6 . Embodiment 2

[0057] Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is that, as shown in Figure 9 , in order to prevent the welding dust from spreading to the side where the negative pressure vacuum passage is not arranged, the peripheral welding jig further comprises a second negative pressure vacuum passage, the second negative pressure vacuum passage comprises a second dust removal pipeline interface 307, a second dust removal gas cavity 308 and a second dust removal inlet 309, and the second dust removal inlet 309 is arranged on the annular shell 313 close to one side of the lithium battery.

[0058] In the above scheme, by arranging two negative pressure vacuum passages, the metal dust, smoke and the like generated during welding can be effectively discharged, so as to prevent the welding dust from spreading upwards or downwards of the nitrogen passage.

[0059] In one specific embodiment of this embodiment, the nitrogen passage is located between the first negative pressure vacuum passage and the second negative pressure vacuum passage in the vertical direction.

[0060] In the above scheme, if the metal dust, smoke and the like generated during welding spread upwards, they are discharged after passing through the first dust removal inlet 306, the first dust removal gas cavity 304 and the first dust removal pipeline interface 302 in the first negative pressure vacuum passage in turn; if the metal dust, smoke and the like generated during welding spread downwards, they are discharged after passing through the second dust removal inlet 309, the second dust removal gas cavity 308 and the second dust removal pipeline interface 307 in the second negative pressure vacuum passage in turn.

[0061] In one specific embodiment of this embodiment, the nitrogen outlet 305, the first dust removal inlet 306 and the second dust removal inlet 309 are respectively in the shape of a slit, a circular hole, a grid, a slit-circular hole alternating distribution, a slit-grid alternating distribution or a circular hole-grid alternating distribution.

[0062] In the above scheme, a plurality of shapes of the nitrogen outlet 305, the first dust removal inlet 306 and the second dust removal inlet 309 are provided, which can be selected according to the actual situation in actual use.

[0063] In one specific embodiment of this example, when the nitrogen outlet 305, the first dust removal inlet 306, or the second dust removal inlet 309 is in the shape of a circular hole or a grid, the number of the nitrogen outlet 305, the first dust removal inlet 306, or the second dust removal inlet 309 is greater than 1, and each nitrogen outlet 305, the first dust removal inlet 306, or the second dust removal inlet 309 is arranged in a ring along the side of the annular housing 313 near the lithium battery. Figure 7 , Figure 8 This is a schematic diagram of the peripheral welding fixture 30 in Embodiment 2 of this utility model. In order to improve the uniformity of nitrogen gas outlet speed at nitrogen outlet 305, based on Embodiment 1, nitrogen outlet 305 is changed from a slit shape to a round hole shape, with several round holes evenly distributed in the circumferential direction.

[0064] In the above scheme, when the nitrogen outlet 305, the first dust removal inlet 306, or the second dust removal inlet 309 are in the shape of a round hole or a grid, the uniformity of the nitrogen outlet velocity at the nitrogen outlet 305 and the uniformity of the inlet velocity at the first dust removal inlet 306 or the second dust removal inlet 309 can be improved.

[0065] In one specific embodiment of this example, the nitrogen outlet 305, the first dust removal inlet 306, or the second dust removal inlet 309 is an annular slit. Figure 4 and Figure 5 This is a cross-sectional view of the peripheral welding fixture 30 in Embodiment 1 of this utility model. The nitrogen pipeline interface 301 is connected to the nitrogen chamber 303, and a slit-shaped nitrogen outlet 305 is provided on the nitrogen chamber 303. The first dust removal pipeline interface 302 (i.e., the vacuum pipeline interface) is connected to the first dust removal gas chamber 304, and a slit-shaped first dust removal air inlet 306 (i.e., the negative pressure dust removal port) is provided at the end of the vacuum chamber.

[0066] In the above scheme, when the nitrogen outlet 305, the first dust removal inlet 306, or the second dust removal inlet 309 are annular slits, the structure is simple and easy to generate and manufacture. Example 3

[0067] Based on Example 2, the difference between this example and Example 2 is as follows: Figures 10-12 As shown, in order to prevent the metal dust and fumes generated during welding from not being completely absorbed, the peripheral welding fixture also includes a third negative pressure vacuum passage. The third negative pressure vacuum passage includes a third dust removal pipe interface 310, a third dust removal gas chamber 311, and a third dust removal air inlet 312. The third dust removal air inlet 312 is located on the annular shell 313 on the side close to the lithium battery.

[0068] In the scheme, the metal dust and smoke generated by welding are discharged by the first negative pressure vacuum passage, the second negative pressure vacuum passage and the third negative pressure vacuum passage, so that the metal dust and smoke generated by welding cannot be completely absorbed.

[0069] In one specific embodiment of the present embodiment, the third negative pressure vacuum passage is located above the first negative pressure vacuum passage or below the second negative pressure vacuum passage.

[0070] In the scheme, the specific arrangement of the first negative pressure vacuum passage, the second negative pressure vacuum passage and the third negative pressure vacuum passage is limited, and in actual use, it can be selected according to actual conditions.

[0071] In one specific embodiment of the present embodiment, the nitrogen outlet 305, the first dust removal inlet 306, the second dust removal inlet 309 and the third dust removal inlet 312 are respectively in the shape of a slit, a circular hole, a grid, a slit-circular hole alternately distributed shape, a slit-grid alternately distributed shape or a circular hole-grid alternately distributed shape.

[0072] In the scheme, a plurality of shapes of the nitrogen outlet 305, the first dust removal inlet 306, the second dust removal inlet 309 and the third dust removal inlet 312 are provided, and in actual use, they can be selected according to actual conditions.

[0073] In one specific embodiment of the present embodiment, when the nitrogen outlet 305, the first dust removal inlet 306, the second dust removal inlet 309 or the third dust removal inlet 312 is in the shape of a circular hole or a grid, the number of the nitrogen outlet 305, the first dust removal inlet 306, the second dust removal inlet 309 or the third dust removal inlet 312 is greater than 1, and each nitrogen outlet 305, first dust removal inlet 306, second dust removal inlet 309 or third dust removal inlet 312 is arranged in a ring shape along the side of the annular shell 313 close to the lithium battery.

[0074] In the scheme, when the nitrogen outlet 305, the first dust removal inlet 306, the second dust removal inlet 309 or the third dust removal inlet 312 is in the shape of a circular hole or a grid, the uniformity of the nitrogen outlet speed of the nitrogen outlet 305 and the uniformity of the inlet speed of the first dust removal inlet 306 or the second dust removal inlet 309 can be improved.

[0075] In one specific embodiment of the present embodiment, the nitrogen outlet 305, the first dust removal inlet 306, the second dust removal inlet 309 or the third dust removal inlet 312 is in the shape of a ring slit.

[0076] In the above scheme, when the nitrogen outlet 305, the first dust removal gas inlet 306, the second dust removal gas inlet 309 or the third dust removal gas inlet 312 are annular slits, the structure is simple, and generation and manufacturing are facilitated.

[0077] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A peripheral welding fixture suitable for lithium batteries, characterized in that: The ring-shaped shell is provided with a nitrogen passage and a first negative pressure vacuum passage which are independent of each other; The ring-shaped shell is arranged on the outside of the lithium battery; The nitrogen passage comprises a nitrogen pipe interface, a nitrogen cavity and a nitrogen outlet which are sequentially arranged and communicated with each other; the nitrogen outlet is arranged on one side of the ring-shaped shell close to the lithium battery; The first negative pressure vacuum passage comprises a first dust removal pipe interface, a first dust removal gas cavity and a first dust removal air inlet which are sequentially arranged and communicated with each other; the first dust removal air inlet is arranged on one side of the ring-shaped shell close to the lithium battery.

2. The peripheral welding jig for lithium batteries according to claim 1, wherein: The peripheral welding jig further comprises a second negative pressure vacuum passage which comprises a second dust removal pipe interface, a second dust removal gas cavity and a second dust removal air inlet which are sequentially arranged and communicated with each other; the second dust removal air inlet is arranged on one side of the ring-shaped shell close to the lithium battery.

3. The peripheral welding jig for lithium battery according to claim 2, wherein: The nitrogen passage is located between the first negative pressure vacuum passage and the second negative pressure vacuum passage in the vertical direction.

4. The peripheral welding jig for lithium battery according to claim 2, wherein: The nitrogen outlet, the first dust removal air inlet and the second dust removal air inlet are respectively in the form of a slit, a circular hole, a grid, an alternating distribution of a slit and a circular hole, an alternating distribution of a slit and a grid or an alternating distribution of a circular hole and a grid.

5. The peripheral welding jig for lithium battery according to claim 4, wherein: When the nitrogen outlet, the first dust removal air inlet or the second dust removal air inlet is in the form of a circular hole or a grid, the number of the nitrogen outlet, the first dust removal air inlet or the second dust removal air inlet is greater than 1, and each nitrogen outlet, first dust removal air inlet or second dust removal air inlet is arranged in a ring shape along one side of the ring-shaped shell close to the lithium battery.

6. The peripheral welding jig for lithium battery according to claim 4, wherein: The nitrogen outlet, the first dust removal air inlet or the second dust removal air inlet is in the form of a ring-shaped slit.

7. The peripheral welding jig for lithium battery according to claim 2, wherein: The peripheral welding jig further comprises a third negative pressure vacuum passage which comprises a third dust removal pipe interface, a third dust removal gas cavity and a third dust removal air inlet which are sequentially arranged and communicated with each other; the third dust removal air inlet is arranged on one side of the ring-shaped shell close to the lithium battery.

8. The peripheral welding jig for lithium battery according to claim 7, wherein: The third negative pressure vacuum passage is located above the first negative pressure vacuum passage or below the second negative pressure vacuum passage.

9. The peripheral welding jig for lithium battery according to claim 8, wherein: The nitrogen outlet, the first dust removal air inlet, the second dust removal air inlet and the third dust removal air inlet are respectively in the form of a slit, a circular hole, a grid, an alternating distribution of a slit and a circular hole, an alternating distribution of a slit and a grid or an alternating distribution of a circular hole and a grid.

10. The peripheral welding jig for lithium battery according to claim 9, wherein: When the nitrogen outlet, the first dust removal air inlet, the second dust removal air inlet or the third dust removal air inlet is in the form of a circular hole or a grid, the number of the nitrogen outlet, the first dust removal air inlet, the second dust removal air inlet or the third dust removal air inlet is greater than 1, and each nitrogen outlet, first dust removal air inlet, second dust removal air inlet or third dust removal air inlet is arranged in a ring shape along one side of the ring-shaped shell close to the lithium battery.

11. The peripheral welding jig for lithium battery according to claim 9, wherein: The nitrogen outlet, the first dust removal air inlet, the second dust removal air inlet or the third dust removal air inlet is in the form of a ring-shaped slit.

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