Dust removal device for battery welding

Abstract

The utility model discloses a dust removal device for battery welding, and belongs to the technical field of battery manufacturing. The battery welding dust removal device comprises a dust removal body, a flowing channel penetrating through the dust removal body along the Z axis is formed in the dust removal body, an arc-shaped groove is formed in the peripheral face of the dust removal body in an annular and inwards-concave mode, and a first plane surrounding the periphery of the flowing channel is arranged at the bottom end of the dust removal body; at least part of the dust removal main body can be inserted into the open shell and is positioned above the battery cell at an interval, so that an acceleration flow channel is formed among the arc-shaped groove, the first plane, a first cylindrical surface, positioned between the arc-shaped groove and the first plane, of the dust removal main body, the open shell and the battery cell, and the acceleration flow channel is communicated with the flow channel. According to the dust removal device for battery welding, by forming the acceleration flow channel with different inner diameters of all parts, welding slag remaining at the welding position between the battery cell and the open shell can be cleanly and comprehensively taken away through high-flow-speed compressed air, the dust removal effect is guaranteed, and the battery can stably store electric energy for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery manufacturing technical field especially relates to a battery welding dust collector. BACKGROUND

[0002] In the production and manufacturing process of cylindrical lithium battery, the battery cell and the steel shell need to be welded to form electrical connection between the two. In the welding process, welding slag will splash, causing some welding slag to remain at the welding position between the battery cell and the steel shell, resulting in the residual welding slag being encapsulated inside the steel shell in subsequent production steps, and the welding slag encapsulated inside easily causes weak discharge of the cylindrical lithium battery during use, resulting in the cylindrical lithium battery being unable to store electricity for a long time and stably.

[0003] To solve the above problems, after welding, a dust removal device is needed to remove dust from the welding position between the battery cell and the steel shell. However, since a straight flow channel with constant inner diameter is usually used in the current dust removal device, a small amount of welding slag still remains at the welding position between the battery cell and the steel shell, making it difficult to ensure the dust removal effect of the welding slag and unable to accurately ensure the long-term and stable storage of electricity by the cylindrical lithium battery. SUMMARY

[0004] The utility model aims at providing a battery welding dust collector that can remove the welding slag remaining at the welding position between the battery cell and the open shell with high flow rate compressed air, ensuring the dust removal effect of the welding slag and better achieving the long-term and stable storage of electricity by the battery.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The battery welding dust collector includes an open shell and a battery cell arranged in the open shell, the battery cell and the open shell are welded and connected, and the battery welding dust collector is used to remove the welding slag at the welding position between the battery cell and the open shell. The battery welding dust collector includes:

[0007] A dust removal body is provided with a flow channel penetrating along the Z-axis inside, the outer peripheral surface of the dust removal body is annularly concave with an arc-shaped groove, the bottom end of the dust removal body is provided with a first plane surrounding the outer periphery of the flow channel, and at least part of the dust removal body can be inserted into the open shell and spaced above the battery cell, so that the arc-shaped groove, the first plane, the first cylindrical surface between the arc-shaped groove and the first plane of the dust removal body, the open shell, and the battery cell form an acceleration flow channel, and the acceleration flow channel is in communication with the flow channel.

[0008] As an option, the arc-shaped groove is provided with a first circular arc between the arc-shaped groove and a second cylindrical surface above the arc-shaped groove, and the first circular arc is tangent to the second cylindrical surface and the arc-shaped groove, respectively.

[0009] As an option, the second cylindrical surface has the same outer diameter as the first cylindrical surface, both being r1, the inner diameter of the open shell is r2, and 1mm≤r2-r1≤5mm.

[0010] As an option, the arc-shaped groove has a circular arc radius r3, and 0.2*r1≤r3≤4*r1.

[0011] As an option, the first circular arc has a radius r4, and 0.1*r3≤r4≤5*r3.

[0012] As an option, the arc-shaped groove is provided with a second circular arc between the arc-shaped groove and the first cylindrical surface, and the second circular arc is tangent to the arc-shaped groove and the first cylindrical surface, respectively, and the second circular arc has a radius r5, and 0.1*r3≤r5≤2*r3.

[0013] As an option, the first cylindrical surface is provided with a third circular arc between the first cylindrical surface and the first plane, the third circular arc is tangent to the first cylindrical surface and the first plane, respectively, and the third circular arc has a radius r6, the flow channel has a radius r7, and 0.1*≤r6≤0.3*.

[0014] As an option, the first plane is provided with a fourth circular arc between the first plane and the inner wall surface of the flow channel, the fourth circular arc is tangent to the first plane and the inner wall surface of the flow channel, respectively, and the fourth circular arc has a radius r8, and 0.1*≤r8≤0.6*.

[0015] As an option, along the Z-axis, the first plane and the second plane at the top end of the battery cell have a spacing d, and 1mm≤d≤5mm.

[0016] As an option, the battery welding dust removal device further comprises:

[0017] A mounting member coaxially connected to the top end of the dust removal body, and the flow channel penetrates through the mounting member along the Z-axis;

[0018] A negative pressure suction member connected to the mounting member, the negative pressure suction member being configured to provide negative pressure;

[0019] A driving assembly configured to drive the dust removal body to approach or move away from the open shell along the Z-axis.

[0020] The battery welding dust removal device has the following beneficial effects:

[0021] The battery welding dust removal device in the utility model, through setting the flow channel along the Z axis through in the dust removal main body, at least part of the dust removal main body can be inserted in the open shell and is spaced above the electric core, so that the arc-shaped groove of the dust removal main body, the first plane, the first cylindrical surface of the dust removal main body between the arc-shaped groove and the first plane, the open shell and the electric core form the accelerating flow channel between each other, so that the welding slag of the welding position between the electric core and the open shell is discharged to the outside of the dust removal main body in turn through the accelerating flow channel and the flow channel, and the dust removal device for the welding position between the electric core and the steel shell is realized; since the accelerating flow channel formed above is a non-linear structure, that is, the accelerating flow channel formed is a Laval flow channel with different inner diameters in each part, so that the airflow flowing into the flow channel through the accelerating flow channel with inconsistent inner diameters is accelerated, so that higher airflow velocity can be obtained under the same conditions, and then the welding slag remaining at the welding position between the electric core and the open shell can be carried away more cleanly and comprehensively through the high-flow-rate compressed air, the dust removal effect on the welding slag is better ensured, so that a small part of the welding slag can be avoided to be encapsulated in the inside of the open shell, and then the long-term and stable storage of the battery electric energy can be better realized, so that the use performance of the battery is better. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure diagram of the battery welding dust removal device (remove negative pressure suction piece and drive assembly, be equipped with the battery) provided by the utility model Figure 1 ;

[0023] Figure 2 It is the front view of the battery welding dust removal device (remove negative pressure suction piece and drive assembly, be equipped with the battery) provided by the utility model;

[0024] Figure 3 It is the sectional view of the battery welding dust removal device (remove negative pressure suction piece and drive assembly, be equipped with the battery) provided by the utility model;

[0025] Figure 4 It is the sectional view of the dust removal main body and the mounting piece provided by the utility model;

[0026] Figure 5 It is the sectional view of the accelerating flow channel formed by the utility model;

[0027] Figure 6 It is the structure diagram of the battery welding dust removal device (remove negative pressure suction piece) provided by the utility model Figure 2 .

[0028] REFERENCE SIGNS:

[0029] 10-battery;101-open shell;102-electric core;1021-second plane;

[0030] 1 - dusting body; 11 - flow channel; 12 - arc-shaped groove; 13 - first cylindrical surface; 14 - first plane; 15 - first circular arc; 16 - second circular arc; 17 - third circular arc; 18 - fourth circular arc; 19 - second cylindrical surface; 191 - accelerating flow channel;

[0031] 2 - mounting; 3 - driving assembly; 31 - support seat; 32 - intermediate plate; 33 - connecting plate; 34 - driving piece; 4 - fixed circular table. DETAILED DESCRIPTION

[0032] All features disclosed in this specification, and / or all steps of any methods or processes disclosed in this specification, can be combined in any combination, except combinations where at least some of such features and / or steps are mutually exclusive.

[0033] Any feature disclosed in this specification, unless stated otherwise, can be replaced by any equivalent or similar feature.

[0034] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained in combination with the drawings and through specific embodiments.

[0035] A battery welding dust removal device is provided in the embodiment, as shown in the drawings. Figures 1 to 3 The battery 10 includes an open shell 101 and a battery cell 102 arranged in the open shell 101, and the battery cell 102 is welded and connected with the open shell 101 to form an electrical connection between the open shell 101 and the battery cell 102. The battery welding dust removal device is used to remove the welding slag at the welding position between the battery cell 102 and the open shell 101, so as to avoid the welding slag being encapsulated in the interior of the open shell 101, and thus the battery 10 can better realize long-term and stable storage of electric energy, so that the use performance of the battery 10 is better. In the embodiment, the battery 10 can be a cylindrical lithium battery, the open shell 101 can be a steel shell, and the welding slag specifically refers to metal welding slag. Here, the specific type of the battery 10 is not limited.

[0036] Specifically, as shown in the drawings. Figures 1 to 5As shown, the battery welding dust removal device comprises a dust removal body 1, a flow channel 11 penetrating along the Z axis is arranged in the dust removal body 1, an arc-shaped groove 12 is arranged in the outer peripheral surface of the dust removal body 1 in a ring-shaped inner recess, a first plane 14 is arranged at the bottom end of the dust removal body 1 and surrounds the outer periphery of the flow channel 11, at least part of the dust removal body 1 can be inserted into the open shell 101 and is spaced above the battery cell 102, so that the arc-shaped groove 12, the first plane 14, the first cylindrical surface 13 of the dust removal body 1 located between the arc-shaped groove 12 and the first plane 14, the open shell 101 and the battery cell 102 form an acceleration flow channel 191 between each other, and the acceleration flow channel 191 is in communication with the flow channel 11. In this embodiment, the dust removal body 1 can be a hollow cylindrical structure.

[0037] The battery welding dust removal device in this embodiment changes the specific arrangement structure of the dust removal body 1 compared with the prior art; by arranging the flow channel 11 penetrating along the Z axis in the dust removal body 1, at least part of the dust removal body 1 can be inserted into the open shell 101 and is spaced above the battery cell 102, so that the arc-shaped groove 12, the first plane 14 of the dust removal body 1, the first cylindrical surface 13 of the dust removal body 1 located between the arc-shaped groove 12 and the first plane 14, the open shell 101 and the battery cell 102 form the acceleration flow channel 191 between each other, so that the welding slag at the welding position between the battery cell 102 and the open shell 101 is sequentially discharged to the outside of the dust removal body 1 through the acceleration flow channel 191 and the flow channel 11, and the air suction and dust removal of the welding position between the battery cell 102 and the steel shell are realized; since the acceleration flow channel 191 formed by the above is a non-linear structure, that is, the acceleration flow channel 191 formed is a Laval flow channel with different inner diameters in each part, so that the airflow flowing into the flow channel 11 through the acceleration flow channel 191 with different inner diameters is accelerated, so that a higher airflow flow rate can be obtained under the same conditions, and then the welding slag remaining at the welding position between the battery cell 102 and the open shell 101 can be more cleanly and comprehensively taken away by the compressed air with high flow rate, the dust removal effect of the welding slag is better guaranteed, so that a small part of the welding slag can be avoided to be encapsulated in the inside of the open shell 101, and then the long-term and stable storage of the battery 10 can be better realized. The electrical energy, so that the use performance of the battery 10 is better.

[0038] Further, as shown in Figure 3 and Figure 4 The first circular arc 15 is arranged between the arc-shaped groove 12 and the second cylindrical surface 19 of the dust removal body 1 located above the arc-shaped groove 12, and the first circular arc 15 is tangent to the second cylindrical surface 19 and the arc-shaped groove 12 respectively, so that the connection transition part between the second cylindrical surface 19 and the arc-shaped groove 12 is relatively smooth, thereby facilitating the compressed air of the second cylindrical surface 19 to flow towards the arc-shaped groove 12.

[0039] Specifically, asFigure 3 and Figure 4 As shown in FIG. 1 and FIG. 2, the second cylindrical surface 19 is equal to the outer diameter of the first cylindrical surface 13, both of which are r1, the inner diameter of the open shell 101 is r2, and 1mm≤r2-r1≤5mm; on the one hand, it can avoid the problem that the entire accelerating flow channel 191 is blocked due to r2-r1 being too small, ensuring that the flow of compressed air in the accelerating flow channel 191 is not too small, so that the welding slag between the battery cell 102 and the welding position of the open shell 101 can be sucked away by the compressed air; on the other hand, it can avoid the problem that the distance between the first cylindrical surface 13 and the inner wall surface of the open shell 101 is too far when r2-r1 is too large, so that the welding slag close to the inner wall surface of the open shell 101 can be better removed by air suction.

[0040] In this embodiment, it is preferred that r2-r1=3mm, which not only ensures a higher flow of compressed air in the accelerating flow channel 191, but also ensures better welding slag removal effect on the inner wall surface of the open shell 101, so that the dust removal effect of the entire battery welding dust removal device on the battery 10 is better.

[0041] Further, the radius of the arc-shaped groove 12 is r3, and 0.2*r1≤r3≤4*r1, which not only ensures a higher flow of compressed air in the accelerating flow channel 191, but also ensures better welding slag removal effect on the inner wall surface of the open shell 101. In this embodiment, it is preferred that r3=0.5*r1.

[0042] Specifically, the radius of the first arc 15 is r4, and 0.1*r3≤r4≤5*r3, so as to ensure a higher flow of compressed air in the accelerating flow channel 191 while ensuring better welding slag removal effect on the inner wall surface of the open shell 101. In this embodiment, it is preferred that r4=r3.

[0043] Further, as shown in FIG. 1 and FIG. 2, the arc-shaped groove 12 and the first cylindrical surface 13 are provided with a second arc 16, and the second arc 16 is tangent to the arc-shaped groove 12 and the first cylindrical surface 13 respectively, so as to make the connection transition part between the first cylindrical surface 13 and the arc-shaped groove 12 relatively smooth, thereby facilitating the flow of compressed air in the arc-shaped groove 12 towards the first cylindrical surface 13. Figure 3 Figure 4 Specifically, the radius of the second arc 16 is r5, and 0.1*r3≤r5≤2*r3, so as to ensure a higher flow of compressed air in the accelerating flow channel 191 while further ensuring better welding slag removal effect on the inner wall surface of the open shell 101. In this embodiment, it is preferred that r5=0.2*r3.

[0044] Further, as shown in FIG. 1 and FIG. 2, the arc-shaped groove 12 and the first cylindrical surface 13 are provided with a second arc 16, and the second arc 16 is tangent to the arc-shaped groove 12 and the first cylindrical surface 13 respectively, so as to make the connection transition part between the first cylindrical surface 13 and the arc-shaped groove 12 relatively smooth, thereby facilitating the flow of compressed air in the arc-shaped groove 12 towards the first cylindrical surface 13.

[0045] Further, as shown in FIG. 1 and FIG. 2, the arc-shaped groove 12 and the first cylindrical surface 13 are provided with a second arc 16, and the second arc 16 is tangent to the arc-shaped groove 12 and the first cylindrical surface 13 respectively, so as to make the connection transition part between the first cylindrical surface 13 and the arc-shaped groove 12 relatively smooth, thereby facilitating the flow of compressed air in the arc-shaped groove 12 towards the first cylindrical surface 13.​Figure 3 and Figure 4 As shown in

[0046] Specifically, as shown in Figure 3 and Figure 4 the radius of the third arc 17 is r6, the radius of the flow channel 11 is r7, and 0.1*(r1-r7)≤r6≤0.3*(r1-r7), so that the difference between the radius of the third arc 17 and the radius of the flow channel 11 is not too large or too small, thereby ensuring that the compressed air in the acceleration flow channel 191 can flow into the flow channel 11 more and faster. In this embodiment, preferably r6=0.2*(r1-r7).

[0047] Specifically, as shown in Figure 3 and Figure 4 the radius of the third arc 17 is r6, the radius of the flow channel 11 is r7, and 0.1*(r1-r7)≤r6≤0.3*(r1-r7), so that the difference between the radius of the third arc 17 and the radius of the flow channel 11 is not too large or too small, thereby ensuring that the compressed air in the acceleration flow channel 191 can flow into the flow channel 11 more and faster. In this embodiment, preferably r6=0.2*(r1-r7).

[0047] Specifically, as shown in Figure 3 and Figure 4 the radius of the third arc 17 is r6, the radius of the flow channel 11 is r7, and 0.1*(r1-r7)≤r6≤0.3*(r1-r7), so that the difference between the radius of the third arc 17 and the radius of the flow channel 11 is not too large or too small, thereby ensuring that the compressed air in the acceleration flow channel 191 can flow into the flow channel 11 more and faster. In this embodiment, preferably r6=0.2*(r1-r7).

[0048] Further, the radius of the fourth arc 18 is r8, and 0.1*(r1-r7)≤r8≤0.6*(r1-r7), so that the difference between the radius of the fourth arc 18 and the radius of the flow channel 11 is not too large or too small, further ensuring that the compressed air in the acceleration flow channel 191 can flow into the flow channel 11 more and faster. In this embodiment, preferably r8=0.5*(r1-r7).

[0049] Specifically, as shown in Figure 3As shown, along the Z-axis, the distance between the first plane 14 and the second plane 1021 at the top of the battery cell 102 is d, and 1mm ≤ d ≤ 5mm. On the one hand, this avoids the blockage of the acceleration channel 191 due to a small d, ensuring that the flow rate of compressed air in the acceleration channel 191 is not too small, thereby ensuring that the welding slag between the first plane 14 and the second plane 1021 is sucked away by the compressed air. On the other hand, it avoids the problem of a large d leading to a large distance between the first plane 14 and the second plane 1021, ensuring that the welding slag deposited between the first plane 14 and the second plane 1021 can be better removed, further ensuring the dust removal effect at the welding position between the battery cell 102 and the open shell 101. In this embodiment, d = 3mm is preferred, at which time the acceleration channel 191 has a high air flow rate, and the removal effect of welding slag deposited on the second plane 1021 of the battery cell 102 is good.

[0050] like Figure 3 to 5 As shown, by providing the aforementioned second cylindrical surface 19, first arc 15, arc groove 12, second arc 16, first cylindrical surface 13, third arc 17, first plane 14 and fourth arc 18 in the dust removal body 1, the aforementioned acceleration flow channel 191 can be formed between the opening housing 101 and the battery cell 102 and the second cylindrical surface 19, first arc 15, arc groove 12, second arc 16, first cylindrical surface 13, third arc 17, first plane 14 and fourth arc 18 when the bottom end of the dust removal body 1 is inserted into the opening housing 101.

[0051] Furthermore, such as Figure 6 As shown, the battery welding dust removal device also includes a mounting component 2, a negative pressure suction component, and a drive assembly 3. The mounting component 2 is coaxially connected to the top of the dust removal body 1, and the flow channel 11 passes through the mounting component 2 along the Z-axis; that is, the flow channel 11 passes through the entire mounting component 2 and the dust removal body 1 along the Z-axis. The negative pressure suction component is connected to the mounting component 2 and is used to provide negative pressure to the acceleration flow channel 191. The drive assembly 3 is used to drive the dust removal body 1 to move closer to or away from the opening housing 101 along the Z-axis. In this embodiment, the negative pressure suction component can specifically be a negative pressure pump, and the mounting component 2 can specifically be a hollow cylindrical structure. The mounting component 2 and the dust removal body 1 are either an integrally formed structure or a separate structure.

[0052] Specifically, the aforementioned negative pressure suction device provides negative pressure to the acceleration channel 191. Specifically, it provides a negative pressure at least 100 Pa lower than the external ambient pressure at the welding position between the battery cell 102 and the open housing 101, thereby ensuring good suction strength of the compressed air for the welding slag. In this embodiment, the negative pressure suction device provides a negative pressure of -450 Pa to the acceleration channel 191.

[0053] Specifically, such asFigure 6 As shown, the driving assembly 3 comprises a support base 31, a driving member 34, an intermediate plate 32 and a connecting plate 33; the fixed end of the driving member 34 is connected to the support base 31, the driving end of the driving member 34 is threadedly connected to the connecting plate 33, the intermediate plate 32 is threadedly connected to the connecting plate 33 to form an L-shaped structure, the intermediate plate 32 is slidably arranged at the fixed end of the driving member 34 along the Z-axis, and the connecting plate 33 is threadedly connected to the fixed circular table 4 on the outer circumferential surface of the dust removal body 1. In this embodiment, the support base 31 can be specifically an L-shaped plate structure, and the driving member 34 can be specifically a jacking air cylinder, which drives the connecting plate 33 to reciprocate along the Z-axis by filling or discharging compressed gas.

[0054] Further, a sliding block is arranged on one of the intermediate plate 32 and the fixed end of the driving member 34, and a sliding rail is arranged on the other one, the sliding rail extends along the Z-axis, and the sliding block can slide on the sliding rail; when it is needed to move the dust removal body 1 along the Z-axis, the driving member 34 drives the connecting plate 33 to move linearly along the Z-axis, at this time, the connecting plate 33 drives the intermediate plate 32 to move synchronously along the Z-axis, so that the sliding block slides along the sliding rail, thereby providing a guiding action for the movement of the connecting plate 33 along the Z-axis, and further ensuring the guiding property and stability of the movement of the connecting plate 33 and the entire dust removal body 1 along the Z-axis.

[0055] The specific working process of the battery welding dust removal device in this embodiment is as follows:

[0056] Firstly, the driving member 34 drives the connecting plate 33 to move linearly downward along the Z-axis, so that the connecting plate 33 drives the intermediate plate 32 to move synchronously along the Z-axis, at this time, the sliding block slides along the sliding rail; at the same time, the connecting plate 33 drives the dust removal body 1 to move downward along the Z-axis, so that the bottom end of the dust removal body 1 is inserted into the open housing 101, and the distance d between the first plane 14 at the bottom end of the dust removal body 1 and the second plane 1021 at the top end of the battery cell 102 is 3mm, at this time, the open housing 101 and the battery cell 102 and the second cylindrical surface 19, the first circular arc 15, the arc-shaped groove 12, the second circular arc 16, the first cylindrical surface 13, the third circular arc 17, the first plane 14 and the fourth circular arc 18 of the dust removal body 1 form accelerating flow passages 191 with different inner diameters.

[0057] Then, the negative pressure suction member starts to work to provide a negative pressure of-450Pa for the accelerating flow passages 191; at this time, the compressed air flows downward through the top opening of the open housing 101, that is, the compressed air sequentially passes through the second cylindrical surface 19, the first circular arc 15, the arc-shaped groove 12, the second circular arc 16, the first cylindrical surface 13, the third circular arc 17, the first plane 14 and the fourth circular arc 18 of the dust removal body 1, and then flows into the flow passage 11, thereby being capable of discharging the welding slag through the flow passage 11 by the action of the compressed air.

[0058] Wherein, due to the gradually narrowing of the accelerating flow channel 191, compression is continuously formed on the airflow between the narrowest part between the first cylindrical surface 13 and the inner wall surface of the open shell 101, and the narrowest part formed between the first plane 14 and the second plane 1021 of the electric core 102; after the compressed air flows out of the narrowest part between the first plane 14 and the second plane 1021, it flows into the flow channel 11 which expands rapidly, so that the airflow flowing into the flow channel 11 is accelerated, and under the same conditions, the compressed air can obtain a higher airflow speed, thereby the efficiency of removing the welding slag can be higher.

[0059] The battery welding dust removal device in the embodiment changes the specific structure of the dust removal body 1 to form the accelerating flow channel 191 in the form of a Laval nozzle structure between the dust removal body 1, the open shell 101 and the electric core 102; under the same conditions, the accelerating flow channel 191 in the embodiment can greatly improve the flow rate of the compressed air during dust removal; through finite element testing, under the condition of connecting-450Pa negative pressure, the highest flow rate of the compressed air after passing through the accelerating flow channel 191 in the form of a Laval nozzle structure can reach 35M / s, and the highest flow rate of the compressed air using the linear flow channel in the prior art is about 26M / s, so that the speed-up rate of the compressed air is 36%, thereby the dust removal efficiency can be significantly improved.

[0060] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A battery welding dust removal device, a battery (10) comprising an open shell (101) and an electric core (102) arranged in the open shell (101), the electric core (102) and the open shell (101) are weldedly connected, the battery welding dust removal device is used for removing welding slag at a welding position between the electric core (102) and the open shell (101), characterized in that, The battery welding dust removal device comprises: A dust removal body (1) is internally provided with a flow channel (11) penetrating along the Z axis, an outer peripheral surface of the dust removal body (1) is annularly concave and provided with an arc-shaped groove (12), a bottom end of the dust removal body (1) is provided with a first plane (14) surrounding an outer periphery of the flow channel (11), and at least a part of the dust removal body (1) can be inserted into the open shell (101) and spaced above the electric core (102), so that the arc-shaped groove (12), the first plane (14), a first cylindrical surface (13) between the dust removal body (1) and the arc-shaped groove (12) and the first plane (14), the open shell (101) and the electric core (102) form an accelerated flow channel (191), and the accelerated flow channel (191) communicates with the flow channel (11).

2. The battery weld fume extraction device of claim 1, wherein, A first circular arc (15) is arranged between the arc-shaped groove (12) and a second cylindrical surface (19) of the dust removal body (1) above the arc-shaped groove (12), and the first circular arc (15) is tangent to the second cylindrical surface (19) and the arc-shaped groove (12) respectively.

3. The battery weld fume extraction device of claim 2, wherein, The second cylindrical surface (19) and the first cylindrical surface (13) have equal outer diameters, both being r1, an inner diameter of the open shell (101) is r2, and 1mm≤r2-r1≤5mm.

4. The battery weld fume extraction device of claim 3, wherein, A circular arc radius of the arc-shaped groove (12) is r3, and 0.2*r1≤r3≤4*r1.

5. The battery weld fume extraction device of claim 4, wherein, A radius of the first circular arc (15) is r4, and 0.1*r3≤r4≤5*r3.

6. The battery weld fume extraction device of claim 4, wherein, A second circular arc (16) is arranged between the arc-shaped groove (12) and the first cylindrical surface (13), and the second circular arc (16) is tangent to the arc-shaped groove (12) and the first cylindrical surface (13) respectively, and a radius of the second circular arc (16) is r5, and 0.1*r3≤r5≤2*r3.

7. The battery weld fume extraction device of any of claims 1-6, wherein, A third circular arc (17) is arranged between the first cylindrical surface (13) and the first plane (14), the third circular arc (17) is tangent to the first cylindrical surface (13) and the first plane (14) respectively, and a radius of the third circular arc (17) is r6, a radius of the flow channel (11) is r7, and 0.1*(r1-r7)≤r6≤0.3*(r1-r7).

8. The battery weld fume extraction device of claim 7, wherein, A fourth circular arc (18) is arranged between the first plane (14) and an inner wall surface of the flow channel (11), the fourth circular arc (18) is tangent to the first plane (14) and the inner wall surface of the flow channel (11) respectively, and a radius of the fourth circular arc (18) is r8, and 0.1*(r1-r7)≤r8≤0.6*(r1-r7).

9. The battery weld fume extraction device of any of claims 1-6, wherein, Along the Z axis, a spacing between the first plane (14) and a second plane (1021) of a top end of the electric core (102) is d, and 1mm≤d≤5mm.

10. The battery weld fume extraction device of any of claims 1-6, wherein, The battery welding dust removal device further comprises: a mounting piece (2) coaxially connected to a top end of the dust removal body (1), the flow channel (11) penetrating through the mounting piece (2) along the Z axis; a negative pressure suction piece connected to the mounting piece (2), the negative pressure suction piece being used for providing negative pressure; a driving assembly (3) used for driving the dust removal body (1) to approach or move away from the open shell (101) along the Z axis.

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