Double-outlet electrode cell structure, assembling device and assembling method

Abstract

The invention discloses a double-outlet electrode battery cell structure, an assembling device and an assembling method.The double-outlet electrode battery cell structure comprises a battery cell shell, a battery cell body and a sealing cover plate, the battery cell shell is provided with a guiding opening, a stop plate is arranged at the end, opposite to the guiding opening, of the battery cell shell, and a first pole hole is formed in the stop plate; the battery core body is arranged in the battery core shell, after the battery core body is arranged in the battery core shell, the first pole at one end of the battery core body penetrates through the first pole hole, the sealing cover plate is provided with a second pole hole, and the second pole at the other end of the battery core body penetrates through the second pole hole; the sealing cover plate is arranged in the battery cell shell in the battery cell body and then is welded with the battery cell shell, so that the double-outlet electrode battery cell structure is obtained. According to the single-side welding of the battery cell, welding procedures are reduced, foreign matter invasion channels are reduced, welding protrusions are reduced, and the quality of the battery cell is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery equipment, and in particular relates to a dual-electrode battery cell structure, an assembly device and an assembly method. Background Art

[0002] As modern electronic devices continue to develop towards miniaturization and higher performance, the performance and quality of battery cells, as key energy storage components, are crucial. The prior art often involves welding battery covers to both sides of the cell housing to seal the cell and prevent electrolyte leakage. However, this assembly method is cumbersome, time-consuming, and labor-intensive. Foreign matter can enter the gaps on both sides, affecting cell quality. Furthermore, the housing is susceptible to deformation when cut at two openings, affecting the quality of the final assembled cell. Therefore, it is necessary to provide a battery cell assembly that reduces the number of welding steps and improves cell quality, as well as a device and method for assembling such a battery cell assembly. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a dual-electrode battery cell structure, an assembly device and an assembly method, which solve the problem in the prior art that there are many welding steps and the quality of the battery cell is greatly affected.

[0004] According to one aspect of the present application, a dual-electrode battery cell structure is disclosed, which includes a battery cell shell, a battery cell body and a sealing cover plate. The battery cell shell has a guide port, and a stop plate is provided at the end of the battery cell shell opposite to the guide port. A first pole hole is provided on the stop plate. The battery cell body is arranged in the battery cell shell. After the battery cell body is arranged in the battery cell shell, the first pole at one end of the battery cell body passes through the first pole hole, and a second pole hole is provided on the sealing cover plate. The second pole at the other end of the battery cell body passes through the second pole hole. After the sealing cover plate is arranged in the battery cell shell, the battery cell body is welded to the battery cell shell to obtain a dual-electrode battery cell structure.

[0005] According to another aspect of the present application, an assembly device is disclosed, which is used to realize the assembly of the above-mentioned battery cell body and the battery cell shell. The device includes a clamping assembly, a guide groove, a traction member and a positioning assembly. The clamping assembly is used to clamp the battery cell shell. The guide groove is provided at the end of the battery cell shell. The guide groove is connected to the guide port. The traction member is used to pull the battery cell body through the guide groove and the guide port to be installed in the battery cell shell. The positioning assembly is used to position the battery cell body before the traction member pulls the battery cell body.

[0006] In some embodiments, an inner groove is provided on the side surface of the column of the first pole of the battery cell body, and the traction member includes a traction rod and a clamping jaw assembly, and the clamping jaw assembly is arranged at the end of the traction rod, and the clamping jaw assembly includes a first clamping jaw and a second clamping jaw arranged opposite to each other, and the first clamping jaw and the second clamping jaw are opened to each other and extend into the inner groove, and the first clamping jaw and the second clamping jaw are close to each other and clamp the first pole by cooperating with the inner groove, so that the traction member pulls the battery cell body into the battery cell shell under the action of external traction force.

[0007] In some embodiments, a thread groove is provided on the first pole of the battery cell body, and the traction member includes a traction rod, and an external thread protrudes from one end of the traction rod, and the external thread is spirally engaged with the thread groove. After the external thread is spirally engaged with the thread groove, the traction member pulls the battery cell body into the battery cell shell under the action of external traction force.

[0008] In some embodiments, a shift fork groove is provided on the first pole of the battery cell body, and the shift fork groove includes a notch and a groove bottom forming a target angle with the notch, and the traction member includes a traction rod and a shift fork piece, and the shift fork piece is formed at the end of the traction rod, and the shift fork piece is rotated through the notch by the target angle and then cooperates with the groove bottom, so that after the shift fork piece cooperates with the groove bottom, the battery cell body is pulled into the battery cell housing under the action of external traction force.

[0009] In some embodiments, the rubber coating on the outer side of the first pole is spirally assembled with the first pole, or the upper and lower parts of the rubber coating on the outer side of the first pole form a circular ring to enclose the first pole, or the upper and lower parts of the rubber coating on the outer side of the first pole form a gap to enclose the first pole. When the upper and lower parts of the rubber coating on the outer side of the first pole form a gap to enclose the first pole, the sealing cover plates on both sides of the second pole hole are provided with protrusions for matching the gaps of the rubber coating, so that after the rubber coating is matched with the first pole, the upper and lower parts of the rubber coating and the gap of the first pole are formed to enclose.

[0010] In some embodiments, the positioning assembly includes a first positioning plate and a second positioning plate, and the first positioning plate and the second positioning plate are arranged relatively to each other up and down. Before the first traction member pulls the battery cell body, the first positioning plate and the second positioning plate move relative to each other to position and clamp the first pole.

[0011] In some embodiments, the clamping assembly includes a first clamping frame and a second clamping frame. The first clamping frame and the second clamping frame are closed together to form a hollow box structure with an opening. The battery cell housing is located in the hollow box structure, and the guide port of the battery cell housing is on the same side as the opening.

[0012] In some embodiments, an explosion-proof valve is provided on the side of the battery cell body, and the battery cell housing includes a receiving portion and an auxiliary portion, the receiving portion is used to receive the battery cell body, the auxiliary portion is connected to the side plate of the receiving portion, a channel is formed between the auxiliary portion and the side plate of the receiving portion, and a drainage hole opposite to the explosion-proof valve is opened on the side plate of the receiving portion, and the drainage hole is connected to the channel.

[0013] In some embodiments, the guide groove is in a bell-mouth shape, the small opening of the bell-mouth is connected to the guide opening of the battery cell housing, and the guide groove is formed at the opening of the hollow box body.

[0014] According to another aspect of the present application, an assembly method is disclosed. The method implements the assembly of the battery cell body and the battery cell housing based on the assembly device described above. The method includes:

[0015] S1, controlling the clamping assembly to clamp the battery cell housing;

[0016] S3, controlling the battery cell body to move toward the clamping assembly to a first target position;

[0017] S5. At the first target position, controlling the first positioning plate and the second positioning plate of the positioning assembly to move relative to each other to position the battery cell body;

[0018] S7, controlling the pulling member to move to the first target position and cooperate with the first pole of the battery cell body;

[0019] S9, controlling the pulling member to move from the first target position toward the battery cell housing until the battery cell body is pulled into the battery cell housing, wherein the guide groove and the guide opening guide the battery cell body when the battery cell body moves toward the battery cell housing;

[0020] S11, controlling the pulling member to separate from the first pole of the battery cell body and reset to an initial position;

[0021] S13, controlling the clamping assembly to release the battery cell shell and proceeding to the installation of the next battery cell body.

[0022] This solution includes but is not limited to the following beneficial effects: (1) The battery cell of the present application is a single-sided welding structure as a whole, that is, there is a cover plate at one end of the battery cell shell, and only one end of the battery cell shell needs to be welded to complete the battery cell packaging. Compared with the traditional double-sided welding process, this structure reduces the welding path by 50%, simplifies the welding steps, and improves the packaging and forming efficiency of the battery cell. In addition, the battery cell shell is open at only one end, which reduces the entry of foreign matter from the gap between the sealing cover plate and the battery cell shell, thereby improving the quality of the battery cell; further, single-sided welding can reduce the heat caused by welding on both sides, which leads to thermal stress deformation of the battery cell shell and improves the quality of the battery cell; based on the one-step, the battery cell shell in the present application has only one end open, and when the shell is cut, the support effect of the end plate at the other end is improved, which improves the cutting of the battery cell shell. The overall external force resistance effect of the battery cell shell is improved, the deformation of the battery cell shell is reduced, and the quality of the assembled battery cell is improved; (2) The present application realizes the clamping of the battery cell shell by setting a clamping component, which ensures the stability of the battery cell shell during battery cell assembly and improves the assembly efficiency. In addition, the guide port of the battery cell shell is connected with the guide groove of the assembly device, which guides the battery cell body and improves the smoothness of installation; (3) In this solution, the battery cell body is positioned before the traction member pulls the battery cell body, which reduces the shaking of the battery cell body and improves the positioning accuracy of the traction position of the traction member and the battery cell body; (4) This solution reduces the occurrence of anti-slip by engaging the inner groove with the clamping claw; (5) Self-locking is achieved through spiral matching, which improves the positioning accuracy of the traction position of the traction member and the battery cell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments or the prior art.

[0024] Figure 1 This is a schematic structural diagram of a dual-electrode battery cell structure according to an embodiment of the present application;

[0025] Figure 2 This is a cross-sectional view of a dual-electrode battery cell structure according to an embodiment of the present application;

[0026] Figure 3 This is a structural diagram of the first pole in an embodiment of the present application;

[0027] Figure 4 This is another structural diagram of the first pole of the embodiment of the present application;

[0028] Figure 5 This is a structural diagram of a traction member according to an embodiment of the present application;

[0029] Figure 6 This is another structural schematic diagram of the traction member of the embodiment of the present application;

[0030] Figure 7 A schematic structural diagram of a sealing cover plate according to an embodiment of the present application;

[0031] Figure 8 This is another structural schematic diagram of the sealing cover plate according to an embodiment of the present application;

[0032] Figure 9 A schematic structural diagram of a battery cell casing according to an embodiment of the present application;

[0033] Figure 10 This is another structural schematic diagram of the battery cell housing of an embodiment of the present application;

[0034] Figure 11 This is another structural schematic diagram of the battery cell housing of an embodiment of the present application;

[0035] Figure 12 is a structural schematic diagram of an assembly device according to an embodiment of the present application;

[0036] Figure 13 This is a schematic diagram of a state before the battery cell housing and the battery cell body of an embodiment of the present application are assembled;

[0037] Figure 14 Schematic diagram of the structure of the assembled state of the battery cell housing and the battery cell body in an embodiment of the present application;

[0038] Figure 15 This is a schematic diagram of the spraying structure of the dual-electrode battery cell structure of an embodiment of the present application;

[0039] In the figure, 1-battery cell body, 11-first pole, 111-inner groove, 112-thread groove, 12-second pole, 2-battery cell shell, 21-stop plate, 22-channel, 23-drainage hole, 3-sealing cover, 31-bump, 4-clamping assembly, 5-traction piece, 51-traction rod, 52-jaw assembly, 521-first jaw, 522-second jaw, 53-external thread, 6-guide groove, 7-rubber bag, 8-positioning assembly, 81-first positioning plate, 82-second positioning plate, 9-spraying device, 91-spraying abutment rod, 92-spraying frame. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] In order to solve the problems existing in the prior art, the present application provides a dual-electrode battery cell structure, specifically, Figures 1 to 4As shown, the dual-electrode cell structure includes a cell shell 2, a cell body 1 and a sealing cover plate 3. The cell shell 2 has a guide port, and a stop plate 21 is provided at the end of the cell shell 2 opposite to the guide port. A first pole 11 hole is opened on the stop plate 21. The cell body 1 is arranged in the cell shell 2. After the cell body 1 is arranged in the cell shell 2, the first pole 11 at one end of the cell body 1 passes through the first pole 11 hole, and a second pole 12 hole is provided on the sealing cover plate 3. The second pole 12 at the other end of the cell body 1 passes through the second pole 12 hole. After the sealing cover plate 3 is arranged in the cell shell 2 in the cell body 1, it is welded to the cell shell 2 to obtain a dual-electrode cell structure.

[0042] It can be understood that the battery cell as a whole is a single-sided welding structure, that is, there is a cover plate starting from one end of the battery cell shell 2, and only one end of the battery cell shell 2 needs to be welded to complete the packaging of the battery cell. Compared with the traditional double-sided welding process, this structure reduces the welding path by 50%, simplifies the welding steps, and improves the packaging and forming efficiency of the battery cell. The battery cell shell 2 is open only at one end, which reduces the entry of foreign matter from the gap between the sealing cover plate 3 and the battery cell shell 2, and improves the quality of the battery cell; further, single-sided welding can reduce the heat caused by welding on both sides, which causes thermal stress deformation of the battery cell shell 2 and improves the quality of the battery cell; based on one step, the battery cell shell 2 in the present application has only one end opening. When the shell is cut, due to the support effect of the end plate at the other end, the overall resistance to external force of the battery cell shell 2 during cutting is improved, the deformation of the battery cell shell 2 is reduced, and the quality of the assembled battery cell is thereby improved.

[0043] Furthermore, according to another aspect of the present application, an assembly device is also disclosed, such as Figures 5 to 14 As shown, the assembly device is used to realize the assembly of the above-mentioned battery cell body 1 and the battery cell shell 2. The device includes a clamping component 4, a guide groove 6, a traction member 5 and a positioning component 8. The clamping component 4 is used to clamp the battery cell shell 2. The guide groove 6 is provided at the end of the battery cell shell 2. The guide groove 6 is connected to the guide port. The traction member 5 is used to pull the battery cell body 1 through the guide groove 6 and the guide port to be installed in the battery cell shell 2. The positioning component 8 is used to position the battery cell body 1 before the traction member 5 pulls the battery cell body 1.

[0044] In some embodiments, continue to refer to Figure 3 and Figure 5An inner groove 111 is provided on the side surface of the column of the first pole 11 of the battery cell body 1. The traction member 5 includes a traction rod 51 and a clamping jaw assembly 52. ​​The clamping jaw assembly 52 is arranged at the end of the traction rod 51. The clamping jaw assembly 52 includes a first clamping jaw 521 and a second clamping jaw 522 arranged opposite to each other. After the first clamping jaw 521 and the second clamping jaw 522 are opened to each other, they extend into the inner groove 111. After the first clamping jaw 521 and the second clamping jaw 522 approach each other, they clamp the first pole 11 by cooperating with the inner groove 111, so that the traction member 5 pulls the battery cell body 1 into the battery cell housing 2 under the action of external traction force. Exemplarily, the first clamping jaw 521 includes a first extension, a first connecting portion, and a first snap-fit ​​portion, and the second clamping jaw 522 includes a second extension, a second connecting portion, and a second snap-fit ​​portion. The first extension and the second extension extend from the end of the traction rod 51 to either side, respectively. One end of the first connecting portion is connected to the first extension, and the other end of the first connecting portion is connected to the first snap-fit ​​portion. One end of the second connecting portion is connected to the second extension, and the other end of the second connecting portion is connected to the second snap-fit ​​portion. The first connecting portion and the second connecting portion are disposed opposite each other, and the non-connected ends of the first snap-fit ​​portion and the second snap-fit ​​portion extend in opposite directions. After extension, a gap is formed between the non-connected ends of the first snap-fit ​​portion and the second snap-fit ​​portion. The inner groove 111 engages with the clamping jaw, reducing the risk of slippage. It is understandable that the structure of the above-mentioned clamping jaw assembly 52 is only an exemplary description, and the matching manner between the clamping jaw assembly 52 and the inner groove 111 of the first pole 11 is only an exemplary description. In other feasible schemes, as long as the clamping jaw assembly 52 can realize the clamping and positioning function of the first pole 11, it will be sufficient.

[0045] For example, in other possible implementations, Figure 4 and Figure 6 As shown, a thread groove is provided on the first pole 11 of the battery cell body 1, and the pulling member 5 includes a pulling rod 51. One end of the pulling rod 51 protrudes with an external thread 53112. The external thread 53112 is screw-engaged with the thread groove. After the external thread 53112 is screw-engaged with the thread groove, the pulling member 5 pulls the battery cell body 1 into the battery cell housing 2 under the action of external traction force. In this example, the screw engagement achieves self-locking, improving the positioning accuracy of the pulling position of the pulling member 5 and the battery cell body 1.

[0046] In some embodiments, a shift fork slot is provided on the first pole 11 of the battery cell body 1. The shift fork slot includes a slot opening and a slot bottom that forms a target angle with the slot opening. The traction member 5 includes a traction rod 51 and a shift fork piece. The shift fork piece is formed at the end of the traction rod 51. The shift fork piece rotates through the slot opening to a target angle and then engages with the slot bottom. After the shift fork piece engages with the slot bottom, the battery cell body 1 is pulled into the battery cell housing 2 under the action of an external traction force. In one embodiment, the target angle is 20° to 160°. The rotational locking between 20° and 160° improves the torsional shedding strength.

[0047] It can be understood that the above-mentioned traction member 5 with a clamping claw assembly 52 or a traction member 5 with a thread or a traction member 5 with a fork plate is only an exemplary description of the traction of the battery cell body 1. In other feasible schemes, the battery cell body 1 can also be pulled by a traction member 5 with a suction cup.

[0048] In some embodiments, continue to refer to Figure 3 As shown in FIG. 1 , the outer plastic package 7 of the first pole 11 can be provided with two parts, the upper and lower parts, covering the first pole 11. In another feasible solution, as shown in FIG. Figure 8 As shown, the sealing cover plate 3 on both sides of the hole of the second pole 12 is provided with protrusions 31. The protrusions 31 are used to form the upper and lower parts of the rubber bag 7 to cover the notch of the first pole 11 after the rubber bag 7 is matched with the first pole 11. It can be understood that after the rubber bag 7 covers the first pole 11, the possibility of separation between the rubber bag 7 and the first pole 11 is reduced due to the resilience of the rubber bag 7.

[0049] In some embodiments, continue to refer to Figure 12 The positioning assembly 8 includes a first positioning plate 81 and a second positioning plate 82. The first positioning plate 81 and the second positioning plate 82 are arranged relative to each other in an upper and lower direction. Before the first traction member 5 pulls the battery cell body 1, the first positioning plate 81 and the second positioning plate 82 move relative to each other to position and clamp the first pole 11. In one example, the first and second positioning plates 81 and 82 are provided with a first arc groove and a second arc groove at opposite ends, respectively. The first arc groove and the second arc groove respectively abut against the upper plate portion and the lower half portion of the first pole 11, so as to achieve the positioning of the battery cell body 1 by clamping the first pole 11, reduce the shaking of the battery cell body 1, and improve the positioning accuracy of the traction position of the traction member 5 and the battery cell body 1.

[0050] In some embodiments, the clamping assembly 4 includes a first clamping frame and a second clamping frame. The first clamping frame and the second clamping frame are closed to each other to form a hollow box structure with an opening. The battery cell housing 2 is located in the hollow box structure, and the guide opening of the battery cell housing 2 is on the same side as the opening. It can be understood that by setting the clamping assembly 4 as the first clamping frame and the second clamping frame, the clamping of the battery cell housing 2 is facilitated, and the release of the battery cell housing 2 is facilitated after the battery cell body 1 and the battery cell housing 2 are assembled. In addition, by setting the clamping assembly 4 to achieve the clamping of the battery cell housing 2, the stability of the battery cell housing 2 during battery cell assembly is ensured, and the assembly efficiency is improved. In addition, the guide opening of the battery cell housing 2 is connected to the guide groove 6 of the assembly device, which guides the battery cell body 1 and improves the smoothness of installation.

[0051] In some embodiments, the guide groove 6 is formed at the opening of the hollow box. Figures 12 to 14As shown, the guide groove 6 is in a trumpet-shaped shape, and the small opening of the trumpet is connected to the guide opening of the battery cell housing 2.

[0052] In one feasible solution, an explosion-proof valve is provided on the side of the cell body 1, and the cell housing 2 includes a receiving portion and an auxiliary portion. The receiving portion is used to receive the cell body 1, and the auxiliary portion is connected to the side plate of the receiving portion. A channel 22 is formed between the auxiliary portion and the side plate of the receiving portion. A drainage hole 23 opposite to the explosion-proof valve is provided on the side plate of the receiving portion, and the drainage hole 23 is connected to the channel 22. Figure 10 As shown, the channel 22 can be set as two channels 22, one of which is connected to the drainage hole 23 to collect the liquid overflowing from the explosion-proof valve when the battery cell is damaged, and the other channel 22 can be set with a water cooling pipe. Figure 11 Among the four channels 22 shown, one channel 22 is connected to the drainage hole 23 and is used to collect liquid overflowing from the explosion-proof valve when the battery cell is damaged. The other three channels 22 can be used to set water cooling pipes and heating pipes.

[0053] Furthermore, in other feasible solutions, when an auxiliary part is provided next to the side panel, the drainage hole 23 of the explosion-proof valve may not be provided on the side panel. In this case, when two channels or four channels are formed between the auxiliary part and the side panel of the accommodating part, the channels are designed for water cooling or heating and are not used for drainage.

[0054] According to another aspect of the present application, an assembly method is disclosed. The method realizes the assembly of the battery cell body 1 and the battery cell housing 2 based on the above-mentioned assembly device. The method includes:

[0055] S1. Control the clamping assembly 4 to clamp the battery cell housing.

[0056] Specifically, the clamping assembly 4 can be controlled by a motor or other power parts to control the relative movement of the first clamping frame and the second clamping frame to close, forming a hollow box structure, and the battery cell housing 2 is enclosed in the hollow box structure.

[0057] S3 , controlling the battery cell body 1 to move toward the clamping assembly 4 to a first target position.

[0058] The first target position is a preset position and can be set in advance. The battery cell body 1 can be transported by a transport member and reset after being transported to the first target position.

[0059] S5 . At the first target position, control the first positioning plate 81 and the second positioning plate 82 of the positioning assembly 8 to move relative to each other to position the battery cell body 1 .

[0060] S7 , controlling the pulling member 5 to move to the first target position and cooperate with the first pole 11 of the battery cell body 1 .

[0061] Specifically, based on the structure of the traction member 5, the control mechanism of the traction member 5 can be determined so that when the traction member 5 is a traction member 5 to be clamped, the jaw assembly 52 can be opened and closed, when the traction member 5 is a traction member 5 with threads, the thread can be screwed in, and when the traction member 5 is a traction member 5 to be shifted fork, the fork can be rotated to a target angle.

[0062] S9. Control the pulling member 5 to move from the first target position toward the direction close to the battery cell housing 2 until the battery cell body 1 is pulled into the battery cell housing 2. When the battery cell body 1 moves toward the battery cell housing 2, the guide groove 6 and the guide opening guide the battery cell body 1.

[0063] S11 , controlling the pulling member 5 to separate from the first pole 11 of the battery cell body 1 and reset to the initial position.

[0064] S13 , controlling the clamping assembly 4 to release the battery cell shell and proceeding to the installation of the next battery cell body 1 .

[0065] Specifically, after the cell shell is released, it indicates that the assembly of one cell in the assembly device is completed, and the next cell body 1 can be installed, that is, steps S1 to S13 are repeated.

[0066] Furthermore, the application also designs a spraying device 9, which is as follows Figure 15 As shown, it includes two spraying abutting rods 91, which are relatively arranged on the spraying frame 92 and are used to abut the battery cell body 1 respectively to achieve double-sided spraying.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A dual-electrode battery cell structure, characterized in that: The dual-electrode cell structure comprises a cell shell (2), a cell body (1) and a sealing cover plate (3); the cell shell (2) has a guide port; a stop plate (21) is provided at one end of the cell shell (2) opposite to the guide port; a first pole (11) hole is provided on the stop plate (21); the cell body (1) is arranged in the cell shell (2); after the cell body (1) is arranged in the cell shell (2), the first pole (11) at one end of the cell body (1) passes through the first pole (11) hole; a second pole (12) hole is provided on the sealing cover plate (3); the second pole (12) at the other end of the cell body (1) passes through the second pole (12) hole; and after the cell body (1) is arranged in the cell shell (2), the sealing cover plate (3) is welded to the cell shell (2) to obtain the dual-electrode cell structure.

2. An assembly device for assembling the battery cell body (1) and the battery cell shell (2) according to claim 1, characterized in that: The device comprises a clamping assembly (4), a guide groove (6), a pulling member (5) and a positioning assembly (8); the clamping assembly (4) is used to clamp the battery cell housing (2); the guide groove (6) is provided at the end of the battery cell housing (2); the guide groove (6) is communicated with the guide opening; the pulling member (5) is used to pull the battery cell body (1) through the guide groove (6) and the guide opening to be installed in the battery cell housing (2); and the positioning assembly (8) is used to position the battery cell body (1) before the pulling member (5) pulls the battery cell body (1).

3. The assembly device according to claim 2, characterized in that: An inner groove (111) is provided on the side surface of the column of the first pole (11) of the battery cell body (1); the traction member (5) comprises a traction rod (51) and a clamping claw assembly (52); the clamping claw assembly (52) is arranged at the end of the traction rod (51); the clamping claw assembly (52) comprises a first clamping claw (521) and a second clamping claw (522) arranged opposite to each other; the first clamping claw (521) and the second clamping claw (522) are opened to extend into the inner groove (111); the first clamping claw (521) and the second clamping claw (522) are brought close to each other and clamp the first pole (11) by cooperating with the inner groove (111), so that the traction member (5) pulls the battery cell body (1) into the battery cell shell (2) under the action of an external traction force.

4. The assembly device according to claim 2, characterized in that: A thread groove (112) is provided on the first pole (11) of the battery cell body (1); the traction member (5) comprises a traction rod (51); an external thread (53) protrudes from one end of the traction rod (51); the external thread (53) is screw-fitted with the thread groove (112); after the external thread (53) is screw-fitted with the thread groove (112), the traction member (5) pulls the battery cell body (1) into the battery cell housing (2) under the action of an external traction force.

5. The assembly device according to claim 2, characterized in that: A shift fork groove is provided on the first pole (11) of the battery cell body (1), the shift fork groove comprising a notch and a groove bottom forming a target angle with the notch, the traction member (5) comprising a traction rod (51) and a shift fork piece, the shift fork piece being formed at the end of the traction rod (51), the shift fork piece being rotated through the notch to the target angle and then engaging with the groove bottom, so that after the shift fork piece engages with the groove bottom, the battery cell body (1) is pulled into the battery cell housing (2) under the action of an external traction force.

6. The assembly device according to any one of claims 3 to 5, characterized in that: The rubber coating (7) on the outside of the first pole (11) is spirally assembled with the first pole (11), or the upper and lower parts of the rubber coating (7) on the outside of the first pole (11) are circularly wrapped around the first pole (11), or the upper and lower parts of the rubber coating (7) on the outside of the first pole (11) are notched around the first pole (11). When the upper and lower parts of the rubber coating (7) on the outside of the first pole (11) are notched around the first pole (11), protrusions (31) for matching the notches of the rubber coating (7) are provided on the sealing cover plates (3) on both sides of the hole of the second pole (12), so that after the rubber coating (7) is matched with the first pole (11), the upper and lower parts of the rubber coating (7) and the notch of the first pole (11) are formed.

7. The assembly device according to claim 2, wherein: The positioning assembly (8) comprises a first positioning plate (81) and a second positioning plate (82), wherein the first positioning plate (81) and the second positioning plate (82) are arranged relative to each other up and down, and before the first pulling member (5) pulls the battery cell body (1), the first positioning plate (81) and the second positioning plate (82) move relative to each other to position and clamp the first pole (11).

8. The assembly device according to claim 2, characterized in that: The clamping assembly (4) comprises a first clamping frame and a second clamping frame, wherein the first clamping frame and the second clamping frame are closed together to form a hollow box structure having an opening, the battery cell housing (2) is located in the hollow box structure, and the guide opening of the battery cell housing (2) is on the same side as the opening.

9. The assembly device according to claim 1, characterized in that: An explosion-proof valve is provided on the side of the battery cell body (1); the battery cell housing (2) comprises a receiving portion and an auxiliary portion; the receiving portion is used to receive the battery cell body (1); the auxiliary portion is connected to a side plate of the receiving portion; a channel (22) is formed between the auxiliary portion and the side plate of the receiving portion; a drainage hole (23) opposite to the explosion-proof valve is provided on the side plate of the receiving portion; the drainage hole (23) is communicated with the channel (22).

10. An assembly method, wherein the method is based on the assembly device according to claim 2 to realize the assembly of the battery cell body (1) and the battery cell shell (2) according to claim 1, characterized in that: The method comprises: S1, controlling the clamping assembly (4) to clamp the battery cell housing; S3, controlling the battery cell body (1) to move toward the clamping assembly (4) to a first target position; S5. At the first target position, controlling the relative movement of the first positioning plate (81) and the second positioning plate (82) of the positioning assembly (8) to position the battery cell body (1); S7, controlling the pulling member (5) to move to the first target position and to cooperate with the first pole (11) of the battery cell body (1); S9, controlling the pulling member (5) to move from the first target position toward the direction approaching the battery cell housing (2) until the battery cell body (1) is pulled into the battery cell housing (2), wherein when the battery cell body (1) moves toward the battery cell housing (2), the guide groove (6) and the guide opening play a guiding role for the battery cell body (1); S11, controlling the pulling member (5) to separate from the first pole (11) of the battery cell body (1) and reset to an initial position; S13, controlling the clamping assembly (4) to release the battery cell shell, and proceeding to the installation of the next battery cell body (1).

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