A battery structure and assembly method thereof

Abstract

The present invention relates to the technical field of lithium batteries, and in particular to a battery structure and an assembly method thereof. The battery structure uses the cooperation of a pole and a steel shell to replace the previous rivet cold heading riveting process, and the part of the steel shell at the installation hole is folded toward the outside of the lithium battery to form a flange for embracing, which is used to embrace the pole and cooperate with a sealing ring to seal the installation hole. The explosion-proof plate is arranged inside the sealed battery, so that the explosion-proof engraved line on the explosion-proof plate is no longer in contact with the outside air. The explosion-proof engraved line of the explosion-proof plate is opened between the outer ring and the central area of ​​the explosion-proof plate for power-off protection. The battery structure of the present invention solves the technical problems in the prior art that the lithium battery has no short-circuit protection design, resulting in a low safety factor, and the steel shell is easily corroded due to the position of the engraved line being exposed to the air. It also solves the technical problem that the lithium battery in the prior art leaves metal fragments inside the steel shell due to the rivets of the cold heading lithium battery cap.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a battery structure and an assembly method thereof. Background Art

[0002] During the use of lithium batteries, if an abnormal situation occurs, the internal air pressure will rise sharply. In order to ensure safety, pressure relief is required. In the prior art, lithium batteries have a scoreline on the top cover of the steel shell of the lithium battery. When the internal air pressure of the lithium battery rises sharply, the top cover is deformed and breaks at the scoreline to relieve pressure. However, there are two problems. First, the existing design only has a pressure relief design, but no anti-short circuit design, which is insufficient in safety performance in emergency situations. Second, the scoreline position of the existing top cover is exposed to the air. The top cover is made of pre-nickel-plated material. The scoreline is opened at the pre-nickel-plated material to achieve an explosion-proof function, which will cause the nickel plating layer to be damaged and the anti-corrosion performance of the lithium battery to decrease, thereby affecting the overall life of the lithium battery. Summary of the invention

[0003] In order to solve the technical problems in the prior art that the safety factor of lithium batteries is low due to the lack of anti-short circuit design and the steel shell is easily corroded due to the exposure of the engraved position to the air, the present application proposes a battery structure and an assembly method thereof to solve the above technical problems.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The present invention provides a battery structure, comprising: a steel shell, a mounting hole is formed at one end of the steel shell, and a portion of the steel shell at the mounting hole is folded toward the outside of the battery to form a flange for embracing; a pole, the pole is assembled at the mounting hole and is embraced by the flange to block the mounting hole, a radially outwardly expanded deformation ring is formed on the end of the pole extending into the battery, and the outer diameter of the deformation ring is greater than the inner diameter of the mounting hole; an explosion-proof plate, the outer ring of the explosion-proof plate is sealingly connected to the end surface of the extending end of the pole, and the explosion-proof score line of the explosion-proof plate is provided between the outer ring and the central area of ​​the explosion-proof plate; a current collecting disk, the current collecting disk is arranged inside the battery, the first surface of the current collecting disk is connected to the winding core inside the battery, and the second surface of the current collecting disk is connected to the central area of ​​the explosion-proof disk; an isolating member, the isolating member is arranged as a whole on the inner wall of the steel shell to isolate the current collecting disk from the steel shell and the pole; a sealing ring, the sealing ring is clamped between the pole and the steel shell.

[0006] Furthermore, a via hole is provided on the pole along the axial direction, the via hole is opposite to the central area of ​​the explosion-proof plate, and a positioning step with an outwardly expanded inner diameter is formed on the protruding end of the pole protruding from the steel shell. At the same time, the pole is provided with a sealing nail which is inserted from the protruding end of the pole and abuts against the step surface of the positioning step to seal the via hole.

[0007] Furthermore, sealant is coated on the fitting surface between the sealing ring and the steel shell.

[0008] Furthermore, the central area of ​​the explosion-proof disk is bent toward the collecting plate and protrudes from the body of the explosion-proof disk, so as to form a clearance space for the explosion-proof disk to deform and break at the bent and protruding positions.

[0009] Furthermore, a plurality of air holes are formed on the current collecting plate.

[0010] Furthermore, a bent extension section is formed on the isolation member and is attached to the axial inner wall of the steel shell to isolate the steel shell from the winding core inside the lithium battery. The main body of the isolation member gradually becomes thinner from near the outer circle, and the thin sheet-like bent extension section extending along the axial direction of the lithium battery is formed at the bending part.

[0011] Furthermore, the isolating member is provided with a plurality of first support columns which are distributed at intervals and supported on the explosion-proof plate and the current collecting plate; the isolating member is provided with a plurality of second support columns which are distributed at intervals and supported on the pole and the current collecting plate; the isolating member is provided with a plurality of third support columns which are distributed at intervals and supported on the steel shell and the current collecting plate.

[0012] Furthermore, a first positioning groove for receiving the explosion-proof plate and a second positioning groove for receiving the pole are formed at the inner circle of the isolation member.

[0013] The present invention also provides a battery structure assembly method for the above-mentioned battery structure, and the assembly steps of the assembly method are as follows:

[0014] S1: sealing and welding the outer ring of the explosion-proof disk to the pole;

[0015] S2: Wrapping the sealing ring with the sealant pre-coated on the outer wall around the pole;

[0016] S3: Control the steel shell to move downward to the pole, and press the flange and inner wall of the steel shell onto the sealing ring coated with the sealant;

[0017] S4: tighten the flange of the steel shell so that the flange embraces the sealing ring coated with the sealant to achieve sealing;

[0018] S5: Control the assembled steel shell to move downward onto the isolation member until the inner wall of the steel shell at the mounting hole fits onto the isolation member, and assemble the isolation member into the steel shell;

[0019] S6: Welding the tabs of the winding core inside the battery to the current collecting plate:

[0020] S7: placing the coil core of the current collecting plate welded thereto into the steel shell and assembling it with the explosion-proof disk;

[0021] S8: welding the collecting plate and the central area of ​​the explosion-proof disk through the through hole on the pole;

[0022] S9: inserting the sealing nail into the through hole from the protruding end of the pole until the sealing nail abuts against the step surface of the positioning step, and sealingly welding the sealing nail and the pole at the protruding end of the pole to achieve a thorough sealing effect.

[0023] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0024] The battery structure of the present invention combines the principles of the combined shell and the combined cap, and replaces the previous rivet cold heading riveting process with the cooperation of the pole and the steel shell. The part of the steel shell at the installation hole is folded toward the outside of the lithium battery to form a flange for embracing, which is used to embrace the pole and cooperate with the sealing ring to block the installation hole. The explosion-proof plate is arranged inside the battery after the blockage is completed, so that the explosion-proof engraved line on the explosion-proof plate is no longer in contact with the outside air, thereby improving the anti-corrosion ability of the lithium battery. At the same time, because the explosion-proof engraved line of the explosion-proof plate is opened on the outer circle and the center of the explosion-proof plate The outer ring of the explosion-proof plate is only connected to the pole, and the central area of ​​the explosion-proof plate is only connected to the collecting plate. When the explosion-proof plate is affected by the internal pressure of the lithium battery and breaks at the explosion-proof engraved line, the electrical connection between the collecting plate inside the lithium battery and the pole is disconnected, thereby preventing a short circuit inside the lithium battery. The assembly method of the pole and the steel shell of the battery structure of the present invention, on the one hand, enhances the corrosion resistance of the lithium battery when providing power-off protection, and on the other hand, does not affect the realization of the explosion-proof pressure relief function of the lithium battery at all. In fact, due to replacing the existing The rivet cold heading riveting process in the existing technology can also avoid the technical problem of leaving metal fragments inside the steel shell due to the cold heading of the rivets of the lithium battery cap. Specifically, the pole is formed outside the steel shell, and the flange of the steel shell is squeezed by the pressure of the external closing fixture to squeeze the pole body outside the steel shell. A radially outward-expanding deformation ring is formed on the end of the pole extending into the battery. The outer diameter of the deformation ring is larger than the inner diameter of the mounting hole. The explosion-proof pressure value of the lithium battery can be set by adjusting the diameter and thickness of the deformation ring. When the internal pressure of the lithium battery increases, the pole The column will be subjected to pressure to escape from the steel shell. When the pressure reaches the expected value, the deformation ring of the pole will be deformed and folded so that the pole is pushed out of the steel shell for explosion-proof pressure relief. In summary, the battery structure of the present invention solves the technical problems in the prior art that the lithium battery has no anti-short circuit design, resulting in a low safety factor and the steel shell is easily corroded due to the exposure of the engraved position to the air. In addition, it also solves the technical problem in the prior art that metal fragments are left inside the steel shell due to the rivets of the cold-forging lithium battery cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the battery structure of the present invention;

[0026] Figure 2 Schematic diagram of the steel shell of the battery structure of the present invention in the upward and cross-sectional perspectives;

[0027] Figure 3 Schematic diagram of a separator of a battery structure of the present invention in bottom view and cross-sectional view;

[0028] Figure 4 Schematic diagram of the current collecting plate of the battery structure of the present invention in bottom view and cross-sectional view;

[0029] Figure 5is a schematic diagram of an assembly step S1 of an assembly method of a battery structure of the present invention;

[0030] Figure 6 is a schematic diagram of an assembly step S2 of the assembly method of a battery structure of the present invention;

[0031] Figure 7 is a schematic diagram of an assembly step S3 of the assembly method of a battery structure of the present invention;

[0032] Figure 8 is a schematic diagram of an assembly step S4 of the assembly method of a battery structure of the present invention;

[0033] Fig. 9 is a schematic diagram of an assembly step S5 of the assembly method of a battery structure of the present invention;

[0034] Fig.10 is a schematic diagram of an assembly step S6 of the assembly method of a battery structure of the present invention;

[0035] Fig.11 is a schematic diagram of an assembly step S7 of the assembly method of a battery structure of the present invention;

[0036] Fig.12 is a schematic diagram of an assembly step S8 of the assembly method of a battery structure of the present invention;

[0037] Fig.13 is a schematic diagram of an assembly step S9 of the assembly method of a battery structure of the present invention;

[0038] Fig.14 It is a schematic diagram of the first stage of power-off and pressure relief of the battery structure of the present invention;

[0039] Fig.15 It is a schematic diagram of the second stage of power-off and pressure relief of the battery structure of the present invention;

[0040] Fig.16 It is a schematic diagram of the third stage of power-off and pressure relief of the battery structure of the present invention;

[0041] Fig.17 It is a schematic diagram of the fourth stage of power-off and pressure relief of the battery structure of the present invention.

[0042] Among them: 1-steel shell, 11-mounting hole, 12-flange; 2-pole, 21-deformation ring, 22-through hole, 23-sealing nail; 3-explosion-proof plate, 31-explosion-proof scale line, 32-make way space; 4-collecting plate, 41-air hole; 5-winding core; 6-isolating piece, 61-bending extension section, 62-first support column, 63-second support column, 64-third support column, 65-first positioning groove, 66-second positioning groove; 7-sealing ring; 8-sealant. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] For the combined battery shell in the prior art, the rivets are cold headed on the inner and outer surfaces of the battery shell, and metal fragments will be left in the shell during the cold heading process. The riveted surface of the rivet is then cold headed multiple times. The riveted shape after cold heading is difficult to control, resulting in failure to compact during sealing, resulting in contact short circuit, and there is no anti-short circuit design inside the battery. The engraved position of the top cover of the steel shell is still exposed to the outside, which is easily corroded by the air, affecting the service life of the finished lithium battery.

[0045] In order to solve the above technical problems, Figure 1-17 As shown, the present invention provides a battery structure, including a steel shell 1, a pole 2, an explosion-proof disc 3, a current collecting plate 4, a spacer 6 and a sealing ring 7. A mounting hole 11 is formed at one end of the steel shell 1. The portion of the steel shell 1 at the mounting hole 11 is folded toward the outside of the battery to form a flange 12 for embracing. The pole 2 is assembled at the mounting hole 11 and is embraced by the flange 12 to block the mounting hole 11. A radially outwardly expanded deformation ring 21 is formed on the end of the pole 2 extending into the interior of the battery. The outer diameter of the deformation ring 21 is larger than the mounting hole 11. The outer ring of the explosion-proof disc 3 is sealed and welded on the end face of the extending end of the pole 2. The explosion-proof score line 31 of the explosion-proof disc 3 is opened between the outer ring and the central area of ​​the explosion-proof disc 3. The collecting disc 4 is arranged inside the battery. The first surface of the collecting disc 4 is connected to the winding core 5 inside the battery. The second surface of the collecting disc 4 is connected to the central area of ​​the explosion-proof disc 3. The isolating member 6 is integrally arranged on the inner wall of the steel shell 1 to isolate the collecting disc 4 from the steel shell 1 and the pole 2. The sealing ring 7 is clamped between the pole 2 and the steel shell 1.

[0046] The battery structure of the present invention combines the principles of the combined shell and the combined cap, and replaces the previous rivet cold heading riveting process with the cooperation of the pole 2 and the steel shell 1. The part of the steel shell 1 at the mounting hole 11 is folded toward the outside of the lithium battery to form a flange 12 for embracing, which is used to embrace the pole 2 and cooperate with the sealing ring 7 to block the mounting hole 11. The explosion-proof plate 3 is arranged inside the battery after the blockage is completed, so that the explosion-proof score line 31 on the explosion-proof plate 3 is no longer in contact with the outside air, thereby improving the anti-corrosion ability of the lithium battery. At the same time, since the explosion-proof score line 31 of the explosion-proof plate 3 is opened on the explosion-proof plate 3 Between the outer ring and the central area, the outer ring of the explosion-proof plate 3 is only connected to the pole 2, and the central area of ​​the explosion-proof plate 3 is only connected to the collecting plate 4. When the explosion-proof plate 3 is affected by the internal pressure of the lithium battery and breaks at the explosion-proof mark line 31, the electrical connection between the collecting plate 4 inside the lithium battery and the pole 2 is disconnected, thereby preventing a short circuit from occurring inside the lithium battery. Here, the assembly method of the pole 2 and the steel shell 1 of the battery structure of the present invention, on the one hand, enhances the corrosion resistance of the lithium battery when providing power-off protection, and on the other hand, does not affect the realization of the explosion-proof pressure relief function of the lithium battery at all. In fact, due to replacing The rivet cold heading riveting process in the prior art can also avoid the technical problem of leaving metal fragments inside the steel shell 1 due to the cold heading of the rivets of the lithium battery cap. Specifically, the pole 2 completes the molding process outside the steel shell 1, and the flange 12 of the steel shell 1 is pressed by the pressure of the external closing fixture to squeeze the pole 2 body outside the steel shell 1. A radially outwardly expanded deformation ring 21 is formed on the extension end of the pole 2 extending into the battery. The outer diameter of the deformation ring 21 is larger than the inner diameter of the mounting hole 11. The explosion-proof pressure value of the lithium battery can be set by adjusting the diameter and thickness of the deformation ring 21. The internal pressure of the lithium battery increases. When the pole 2 is pressed against the steel shell 1, the pole 2 will be subjected to pressure to escape from the steel shell 1. When the pressure reaches the expected value, the deformation ring 21 of the pole 2 will be deformed and folded, so that the pole 2 is pushed out of the steel shell 1 to perform explosion-proof pressure relief. In summary, the battery structure of the present invention solves the technical problems in the prior art that the lithium battery in the prior art has no anti-short-circuit design, resulting in a low safety factor and the steel shell is easily corroded due to the exposure of the engraved position to the air. In addition, it also solves the technical problem that the lithium battery in the prior art leaves metal fragments inside the steel shell 1 due to the rivets of the cold-forged lithium battery cap.

[0047] In a preferred embodiment of the present invention, the flange 12 of the steel shell 1 is pressed together during the assembly process of embracing the pole 2, so that the mounting hole 11 presents an "eight-shaped" shape that is wide inside and narrow outside, thereby better embracing the pole 2 and preventing the pole 2 from falling out. Furthermore, the mating parts of the flange 12 and the pole 2 are made into rough surfaces to increase friction and thus enhance the clamping force.

[0048] It should be noted that the deformation ring 21 not only plays a supporting and sealing role inside the lithium battery, but also needs to allow the pole 2 to deform and rush out of the steel shell 1 in time when the internal air pressure rises, so as to achieve the effect of pressure relief. In actual design, since the set values ​​of the length and thickness of the deformation ring 21 extending radially from the main part of the pole 2 are closely related to the preset explosion-proof value of the lithium battery, the set values ​​of the length and thickness of the deformation ring 21 extending radially from the main part of the pole 2 are usually small, so that the deformation ring 21 can be deformed by the internal air pressure of the lithium battery, and as the air pressure increases, the pole 2 can climb outward along the inner contour of the mounting hole 11, and be pushed out of the lithium battery by the internal pressure, achieving the effect of pressure relief.

[0049] In order to achieve the connection between the explosion-proof disc 3 and the collector plate 4 during the assembly process, a through hole 22 is provided in the axial direction on the pole 2, and the through hole 22 is directly opposite to the central area of ​​the explosion-proof disc 3. The through hole 22 is formed with a positioning step with an inner diameter expanded outward at the protruding end of the pole 2 protruding from the steel shell 1. At the same time, the pole 2 is provided with a sealing pin 23 inserted from the protruding end of the pole 2 and abutting against the step surface of the positioning step, and the sealing pin 23 is used to block the through hole 22. Specifically, during the assembly process, the welding head of the welding device can weld the central area of ​​the explosion-proof mark 31 through the through hole 22 on the pole 2, such as laser penetration welding to weld the central area of ​​the explosion-proof disc 3 to the collector plate 4, and the role of the positioning step is to position the sealing pin 23 to ensure that the sealing pin 23 is installed in place.

[0050] In a specific embodiment of the present invention, the cross section of the sealing ring 7 is L-shaped, so that the sealing ring 7 can completely fit the pole 2 , such as fitting the axial outer wall surface of the pole 2 and the upper end surface of the deformation ring 21 .

[0051] In the battery structure of the present invention, a sealant 8 is also coated on the contact surface between the sealing ring 7 and the steel shell 1 so as to completely seal the mounting hole 11 .

[0052] In a specific embodiment of the present invention, the central area of ​​the explosion-proof disc 3 is bent toward the collecting plate 4 and protrudes from the body of the explosion-proof disc 3, so as to form a clearance space 32 for the explosion-proof disc 3 to deform and rupture at the bent and protruding position.

[0053] In a specific embodiment of the present invention, a plurality of air holes 41 are formed on the collecting plate 4. The air holes 41 of the collecting plate 4 are to allow the gas generated inside the lithium battery to pass through the collecting plate 4 normally, so as to avoid the accumulation of gas below the collecting plate 4 and the inability to release pressure, which may cause the lithium battery to explode. Furthermore, the central area of ​​the collecting plate 4 and the portion connected to the explosion-proof plate 3 protrude toward the explosion-proof plate 3, which, on the one hand, facilitates the welding of the collecting plate 4 and the explosion-proof plate 3, and on the other hand, the collecting plate 4 is provided with a protruding portion, which can adjust the front and back sides in the vibrating feeding and conveying device. The vibrating feeding and conveying device here can be selected as the vibrating feeding and conveying device with the authorization announcement number CN116873509B, and the invention name is a vibrating feeding and conveying device with a vibrating feeding mechanism.

[0054] In a preferred embodiment of the present invention, a bent extension section 61 is formed on the isolation member 6 and is attached to the axial inner wall of the steel shell 1 to isolate the steel shell 1 from the winding core 5 inside the lithium battery. The main body of the isolation member 6 gradually becomes thinner from near the outer circle, and a thin sheet-like bent extension section 61 extending along the axial direction of the lithium battery is formed at the bending portion.

[0055] It should be noted that, in the internal structure of the lithium battery in the prior art, the isolation member 6 is used to isolate the rivet from the shell. The isolation member 6 is only attached to the surface of the end of the shell and does not extend to the vertical inner wall of the shell. One end of the core 5 is connected to the collecting plate 4, but the maximum outer diameter of the core 5 is larger than the maximum diameter of the collecting plate 4, that is, the end outer wall of the core 5 will touch the shell of the lithium battery during the expansion process. In order to prevent the core 5 from contacting the inner wall of the shell, it is necessary to coat the core 5 with an insulating film. In the battery structure of the present invention, the isolation member 6 is bent and extended toward the axial inner wall of the steel shell 1 to isolate the steel shell 1 from the core 5, thereby saving insulating film material and saving a process of coating the insulating film, greatly reducing the manufacturing cost of the lithium battery. It should also be noted that the bent extension section 61 of the separator 6 needs to be made as thin as possible to avoid occupying the laying space of the winding core 5. The separator 6 in the battery structure of the present invention adopts an integrated molding process to form the bent extension section 61. The bent portion of the separator 6 abuts against the bent portion of the inner wall of the steel shell 1, which can help fix the separator 6 and prevent the separator 6 from "falling off" inside the lithium battery; at the same time, the thinned bent portion can also be deformed during assembly, so that the separator 6 can be better assembled into the steel shell 1. Furthermore, the separator 6 adopts an integrated injection molding process. In order to facilitate demolding, the body of the separator 6 gradually becomes thinner from near the outer circle.

[0056] In a preferred embodiment of the present invention, a plurality of first support columns 62 are formed on the isolating member 6, which are distributed at intervals and supported on the explosion-proof disc 3 and the current collecting plate 4; a plurality of second support columns 63 are formed on the isolating member 6, which are distributed at intervals and supported on the pole 2 and the current collecting plate 4; a plurality of third support columns 64 are formed on the isolating member 6, which are distributed at intervals and supported on the steel shell 1 and the current collecting plate 4, so that the internal structure of the lithium battery is more stable. Among them, the first support column 62, the second support column 63 and the third support column 64 are not made into a full circle ring form, but are made into a spaced distribution form, in order to save materials and reduce costs under the premise of achieving stable support.

[0057] In a preferred embodiment of the present invention, a first positioning groove 65 for receiving the explosion-proof disc 3 and a second positioning groove 66 for receiving the pole 2 are formed at the inner circle of the isolation member 6 to stabilize the internal structure of the lithium battery.

[0058] The lithium battery working, power-off and pressure-release process is as follows: Fig.14 As shown in the figure, the lithium battery starts to work and the internal pressure starts to rise; Fig.15 As shown in the figure, the internal pressure of the lithium battery continues to rise to a certain stage, and the score line of the explosion-proof plate breaks, achieving the power-off effect and also achieving the initial pressure relief effect at the same time; Fig.16 As shown, the internal pressure of the lithium battery rises again, and the deformation ring 21 used to support the pole 2 begins to deform, so that the pole 2 after the deformation ring 21 is bent can be displaced at the mounting hole 11, so that the internal pressure squeezes the pole 2 out of the steel shell 1; Fig.17 As shown, the internal pressure of the lithium battery continues to rise, the pole 2 is severely deformed, and breaks free from the embrace of the flange of the steel shell 1, and squeezes out of the steel shell 1 from the mounting hole 11, achieving the effect of pressure relief.

[0059] In order to realize the above-mentioned battery structure, Figure 5-13 As shown, the present invention also provides a battery structure assembly method for assembling the above battery structure, and the assembly steps of the assembly method are as follows:

[0060] S1: sealingly welding the outer ring of the explosion-proof disc 3 and the pole 2, so that the two are welded together and at the same time play a sealing role, so that the gas outside the two opposite surfaces of the explosion-proof disc 3 cannot flow;

[0061] S2: pre-coat the sealing ring 7 with the sealant 8, and use a clamp to wrap the sealing ring 7 around the pole 2;

[0062] S3: The assembled pole 2 and sealing ring 7 are transferred to the receiving table of the equipment fixture through the clamp, the steel shell 1 is controlled to move downward to the pole 2, and the flange 12 and the inner wall of the steel shell 1 are pressed onto the sealing ring 7 coated with the sealant 8;

[0063] S4: The steel shell 1 is sealed by a closing jig, which applies downward pressure to squeeze the steel shell 1, tightens the flange 12 of the steel shell 1, and makes the flange 12 concave toward the sealing ring 7, so that the mounting hole 11 forms an "eight-shaped" shape with a wide inside and a narrow outside, so that the flange 12 embraces the sealing ring 7 coated with the sealant 8 to achieve sealing. The closing jig here can be a closing jig with a publication number of CN218731131U and a utility model name of a closing jig;

[0064] S5: With the support of the receiving table of the equipment fixture, the assembled steel shell 1 is controlled to move downward onto the isolation member 6 until the inner wall of the steel shell 1 at the mounting hole 11 is attached to the isolation member 6, and the isolation member 6 is assembled into the steel shell 1;

[0065] S6: Welding the tabs of the winding core 5 inside the battery to the current collecting plate 4:

[0066] S7: Using a positioning jig, the coil core 5 with the collector plate 4 welded thereto is placed into the steel shell 1 and assembled with the explosion-proof disk 3;

[0067] S8: welding the central area of ​​the current collecting plate 4 and the explosion-proof disk 3 through the through hole 22 on the pole 2;

[0068] S9: insert the sealing nail 23 from the protruding end of the pole 2 into the through hole 22 until it is sealed against the step surface of the positioning step, and seal-weld the sealing nail 23 and the pole 2 at the protruding end of the pole 2.

[0069] It should be understood that the specific embodiments described above are only used to explain the present invention, and are not used to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A battery structure, characterized in that: include: A steel shell (1), wherein a mounting hole (11) is formed at one end of the steel shell (1), and a portion of the steel shell (1) at the mounting hole (11) is folded toward the outside of the battery to form a flange (12) for embracing; A pole (2), the pole (2) being mounted at the mounting hole (11) and surrounded by the flange (12) to block the mounting hole (11), a radially outwardly expanding deformation ring (21) being formed on the end of the pole (2) extending into the interior of the battery, the outer diameter of the deformation ring (21) being greater than the inner diameter of the mounting hole (11); An explosion-proof disc (3), wherein the outer ring of the explosion-proof disc (3) is sealingly connected to the end surface of the extension end of the pole (2), and the explosion-proof score line (31) of the explosion-proof disc (3) is provided between the outer ring and the central area of ​​the explosion-proof disc (3); A current collecting disk (4), the current collecting disk (4) being arranged inside the battery, the first surface of the current collecting disk (4) being connected to the winding core (5) inside the battery, and the second surface of the current collecting disk (4) being connected to the central area of ​​the explosion-proof disk (3); An isolating member (6), the isolating member (6) being integrally arranged on the inner wall of the steel shell (1) so as to isolate the current collecting plate (4) from the steel shell (1) and from the pole (2); A sealing ring (7), wherein the sealing ring (7) is clamped between the pole (2) and the steel shell (1).

2. The battery structure according to claim 1, characterized in that: The pole (2) is provided with a through hole (22) along the axial direction, the through hole (22) is directly opposite to the central area of ​​the explosion-proof plate (3), and the through hole (22) is formed with a positioning step with an outwardly expanded inner diameter at the protruding end of the pole (2) protruding from the steel shell (1). At the same time, the pole (2) is provided with a sealing pin (23) inserted from the protruding end of the pole (2) and abutting against the step surface of the positioning step to seal the through hole (22).

3. The battery structure according to claim 2, characterized in that: Sealant (8) is also coated on the contact surface between the sealing ring (7) and the steel shell (1).

4. The battery structure according to claim 1, characterized in that: The central area of ​​the explosion-proof disc (3) is bent toward the collecting plate (4) and protrudes from the body of the explosion-proof disc (3), so as to form a clearance space (32) for the explosion-proof disc (3) to deform and break at the bent and protruding position.

5. The battery structure according to claim 1, characterized in that: A plurality of air holes (41) are formed on the current collecting plate (4).

6. The battery structure according to claim 1, characterized in that: The isolating member (6) is provided with a bent extension section (61) which is attached to the axial inner wall of the steel shell (1) so as to isolate the steel shell (1) from the winding core (5) inside the lithium battery. The main body of the isolating member (6) gradually becomes thinner from near the outer ring and forms the thin sheet-like bent extension section (61) extending in the axial direction of the lithium battery at the bend.

7. The battery structure according to claim 1, characterized in that: The isolating member (6) is provided with a plurality of first support columns (62) which are distributed at intervals and supported on the explosion-proof disk (3) and the current collecting disk (4); the isolating member (6) is provided with a plurality of second support columns (63) which are distributed at intervals and supported on the pole (2) and the current collecting disk (4); and the isolating member (6) is provided with a plurality of third support columns (64) which are distributed at intervals and supported on the steel shell (1) and the current collecting disk (4).

8. The battery structure according to claim 1, characterized in that: A first positioning groove (65) for receiving the explosion-proof disc (3) and a second positioning groove (66) for receiving the pole (2) are formed at the inner ring of the isolation piece (6).

9. A method for assembling a battery structure, used for assembling the battery structure as claimed in claim 3, characterized in that: The assembly steps of the assembly method are as follows: S1: sealingly welding the outer ring of the explosion-proof disk (3) to the pole (2); S2: Wrapping the sealing ring (7) on the outer wall of which the sealing glue (8) is pre-coated, around the pole (2); S3: Controlling the steel shell (1) to move downward onto the pole (2), and pressing the flange (12) and the inner wall of the steel shell (1) onto the sealing ring (7) coated with the sealant (8); S4: tightening the flange (12) of the steel shell (1) so that the flange (12) embraces the sealing ring (7) coated with the sealant (8) to achieve sealing; S5: controlling the assembled steel shell (1) to move downward onto the isolation member (6) until the inner wall of the steel shell (1) at the mounting hole (11) is attached to the isolation member (6), and assembling the isolation member (6) into the steel shell (1); S6: welding the tabs of the winding core (5) inside the battery to the current collecting plate (4): S7: placing the coil core (5) to which the current collecting plate (4) has been welded into the steel shell (1) and assembling it with the explosion-proof disk (3); S8: welding the collecting plate (4) and the central area of ​​the explosion-proof disk (3) through the through hole (22) on the pole (2); S9: inserting the sealing nail (23) from the protruding end of the pole (2) into the through hole (22) until the sealing nail (23) abuts against the step surface of the positioning step, and sealingly welding the sealing nail (23) and the pole (2) at the protruding end of the pole (2) to achieve a complete sealing effect.

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