Lithium battery roll core broaching device and broaching method

Abstract

The lithium battery roll core broaching device comprises a carrying plate on the top side of a station, a support is fixedly arranged at the rear end of the top side of the carrying plate through bolts, and an electric control telescopic rod is fixedly arranged at the top of the support in a penetrating mode. When the improved lithium battery roll core broaching device is used, through combination of the plugging block and the limiting cylinder, constraint limiting of a lithium battery roll core, plugging of openings in the two ends of a center hole of the lithium battery roll core and gas injection operation of the center hole of the lithium battery roll core are sequentially and automatically completed; a high-pressure cavity with high strength can be rapidly formed in the center hole of the lithium battery roll core, the diaphragm expands outwards due to the pushing of the gas to the diaphragm, so that the center hole of the whole lithium battery roll core is driven to expand, the inner layer of the lithium battery roll core is hardly damaged, and the service life of the lithium battery roll core is prolonged. Therefore, the scrap probability during the reaming operation of the central hole of the roll core of the lithium battery is reduced, and the production cost of the lithium battery is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery core expansion devices, and in particular to a lithium battery core expansion device and a hole expansion method. Background Art

[0002] The lithium battery core is an important component of the lithium battery. It is composed of a series of positive and negative electrode sheets and separator sheets stacked alternately. In the production process of lithium batteries, the hole expansion of the lithium battery core is an important link in the production process of lithium batteries. The principle of lithium battery core hole expansion is mainly to use mechanical or air pressure methods to expand the center hole of the lithium battery core.

[0003] The existing lithium battery core expansion operation generally uses a reaming needle or a similar tool, which is inserted into the center hole of the lithium battery core, and the reaming needle is moved in the center hole of the core by rotating, pushing or applying pressure, thereby gradually expanding the hole diameter. During the process of inserting the reaming needle into the lithium battery core, due to the friction between the reaming needle and the inner wall of the lithium battery core, the inner layer of the lithium battery core may be damaged during the rotation and advancement of the reaming needle, resulting in the scrapping of the lithium battery core and increasing production costs. Summary of the invention

[0004] The object of the present invention is to provide a lithium battery core hole enlarging device and a hole enlarging method so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lithium battery core reaming device, comprising a carrier plate on the top side of a workstation, the rear end of the top side of the carrier plate is fixedly equipped with a bracket by bolts, the top of the bracket is fixedly penetrated by an electric-controlled telescopic rod, the bottom end of the electric-controlled telescopic rod is provided with a reaming assembly, the reaming assembly comprises a blocking block, a gas storage tank is provided in the blocking block, a piston plate is slidably provided in the gas storage tank, and the driving end of the electric-controlled telescopic rod slides through the cylinder wall of the blocking block and is fixedly connected to the piston plate, a limiting cylinder is fixedly equipped with a position corresponding to the blocking block on the top side of the carrier plate by bolts, a gas injection head is fixedly penetrated at the center position of the bottom side of the blocking block, two rectangular holes are relatively provided on the inner bottom wall of the gas storage tank, a one-way valve is fixedly installed in the cylinder wall of the blocking block, and the interior of the one-way valve air inlet is communicated with the interior of the gas storage tank, and the exhaust end of the one-way valve is inserted into the top opening of the gas injection head and is fixedly connected to the gas injection head; A blocking mechanism is provided at a position on the blocking block corresponding to the rectangular hole, and a supporting mechanism is provided on the blocking block and the limiting cylinder.

[0006] Preferably, two first springs are arranged relatively between the piston plate and the inner wall of the air storage tank, and both ends of each first spring are respectively fixedly connected to the bottom side of the piston plate and the inner bottom wall of the air storage tank, and the two first springs are located between the two rectangular holes.

[0007] Preferably, a circular hole is opened on the loading plate at the position corresponding to the limiting cylinder, an electric-controlled valve is fixedly installed through the center position of the bottom end of the limiting cylinder, and the top of the electric-controlled valve is coplanar with the inner bottom wall of the limiting cylinder, the diameter of the top of the electric-controlled valve is the same as the diameter of the gas injection head, and the bottom end of the electric-controlled valve is inserted into the circular hole.

[0008] Preferably, the sealing mechanism includes a filling block, which is arranged in the corresponding rectangular hole, and the outer peripheral wall of the filling block is in contact with the inner wall of the corresponding rectangular hole, the upper and lower ends of the filling block are coplanar with the inner bottom wall of the air storage tank and the bottom side of the sealing block, respectively, and a sealing plate is fixedly installed on the top side of the filling block, and the bottom side of the sealing plate is in contact with the inner bottom wall of the air storage tank.

[0009] Preferably, two L-shaped square rods are relatively fixedly installed at the positions of the inner circumferential wall of the air storage tank corresponding to the sealing plate, the bottom ends of the square rods slide through the corresponding sealing plate and the corresponding filling block, the bottom sides of the square rods are coplanar with the bottom sides of the corresponding filling blocks, and a second spring is wrapped around the outer circumferential side of the bottom of the square rod, and the two ends of the second spring are respectively fixedly connected to the outer wall of the corresponding square rod and the top side of the corresponding sealing plate.

[0010] Preferably, a plurality of connecting holes are provided in a circular array on the top side of the blocking block, a valve core is fixedly installed at a position corresponding to the connecting hole on the piston plate, and the top of the valve core passes through the corresponding connecting hole and is gap-matched with the inner wall of the corresponding connecting hole, the pressing end of the valve core is in contact with the outer shell wall of the electrically-controlled telescopic rod, a gasket is provided between the plurality of valve cores, and the bottom side of the gasket is fixedly connected to the top side of the blocking block, the inner ring wall of the gasket is slidably connected to the driving rod of the electrically-controlled telescopic rod, and the top side of the gasket is in contact with the outer shell wall of the electrically-controlled telescopic rod.

[0011] Preferably, the supporting mechanism comprises a plurality of guide rods, a plurality of slide grooves are provided on the bottom side of the blocking block in a circular array, and the plurality of slide grooves are all located on the outer peripheral side of the air storage tank, the top end of the guide rod is located in the corresponding slide groove and is slidably connected to the inner wall of the corresponding slide groove, a third spring is provided in the slide groove, and the two ends of the third spring are respectively fixedly connected to the top end of the corresponding guide rod and the inner top wall of the corresponding slide groove, an annular groove is provided on the outer peripheral wall of the bottom of the guide rod, a balloon is sleeved in the annular groove, and the inner wall of the bottom opening of the balloon is fixedly connected to the inner wall of the corresponding annular groove, the top end of the balloon is gap-matched with the inner top wall of the corresponding annular groove, and the balloon is filled with air.

[0012] Preferably, a plurality of air guide holes are provided at the top of the limiting cylinder in a circular array, the interior of the air guide holes is communicated with the interior of the circular hole, a pressure sensor is fixedly installed in the bottom opening of the air guide holes via a plurality of connecting blocks, a soft pad is fixedly installed at the top of the pressure sensor, and the outer peripheral wall of the soft pad is in contact with the inner wall of the corresponding air guide hole.

[0013] Preferably, a limiting ring is fixedly installed in the top opening of the balloon, and the inner ring wall of the limiting ring contacts the inner wall of the corresponding annular groove; a sealing ring is fixedly installed in the ring wall of the limiting ring, and the inner ring wall of the sealing ring contacts the inner ring wall of the corresponding annular groove; A hole expansion method, comprising the above-mentioned lithium battery core hole expansion device, specifically comprises the following steps: Step 1: First, the operator inserts the lithium battery core into the limiting cylinder until the bottom side of the lithium battery core contacts the inner bottom wall of the limiting cylinder; Step 2: The operator starts the electric telescopic rod, which stretches and slowly pushes the blocking block toward the limit cylinder until the blocking block and the limit cylinder collide with each other. Then, the electric telescopic rod stretches rapidly to push the piston plate downward rapidly, thereby forming a high-pressure chamber in the center hole of the lithium battery core. The expansion operation of the center hole of the lithium battery core is completed by pushing the diaphragm with gas. Step 3: After the expansion operation of the center hole of the lithium battery core in step 2 is completed, the electrically controlled telescopic rod is retracted to pull the piston plate upward to reset, and after the piston plate and the inner wall of the gas storage tank collide with each other, the blocking block is driven to move upward to reset. At this time, a negative pressure chamber is formed in the gas storage tank, which adsorbs the lithium battery core and moves it out of the limiting cylinder together; Step 4: After the lithium battery core is moved out of the limiting cylinder in step 3, the operator pinches the lithium battery core by hand and pulls the lithium battery core downward to take the lithium battery core out from between the guide rods, and the unloading operation of the lithium battery core is completed.

[0014] The present invention has at least the following beneficial effects: 1. When the improved lithium battery core expansion device is used, the blocking block and the limiting cylinder are combined to automatically complete the constraint and limitation of the lithium battery core, the blocking of the openings at both ends of the center hole of the lithium battery core, and the gas injection operation of the center hole of the lithium battery core in sequence, thereby quickly forming a high-strength high-pressure cavity inside the center hole of the lithium battery core. Due to the push of the gas on the diaphragm, the diaphragm expands outward, thereby driving the center hole of the entire lithium battery core to expand, and almost no damage is caused to the inner layer of the lithium battery core, thereby reducing the scrap probability of the lithium battery core during the center hole expansion operation and reducing the production cost of lithium batteries; 2. When the device is in use, when the blocking block approaches the limiting cylinder, the supporting mechanism can detect the alignment of the blocking block and the limiting cylinder. If there is no misalignment between the blocking block and the limiting cylinder, the supporting mechanism can constrain and guide the moving trajectory of the blocking block as the blocking block continues to move downward, so that the bottom end of the blocking block can be directly inserted into the top opening of the limiting cylinder. If there is a misalignment between the blocking block and the limiting cylinder, the operation of the electric telescopic rod can be stopped in time to avoid the blocking block and the limiting cylinder from fitting together in a misaligned state, which may cause damage to the device or the lithium battery core, and the operator can be promptly prompted to perform maintenance on the device in a timely manner.

[0015] 3. After the expansion operation of the center hole of the lithium battery core is completed, the electrically controlled telescopic rod is retracted to pull the blocking block upward and reset. At the same time, a negative pressure chamber can be formed in the gas storage tank through the cooperation of the blocking mechanism and the one-way valve, thereby forming an adsorption force between the lithium battery core and the blocking block, so that when the blocking block is separated from the limiting cylinder, the lithium battery core can be directly pulled out of the limiting cylinder together. The operator does not need to perform other operations, and the unloading operation of the lithium battery core can be automatically completed. The device has a high degree of automation, which is convenient for the operator's processing operation; 4. After the lithium battery core is pulled out of the limiting cylinder, the supporting mechanism can constrain and limit the lithium battery core at multiple positions on the outer peripheral side of the lithium battery core and multiple positions on the bottom side of the lithium battery core, so that the operator does not need to remove the lithium battery core in time when the adsorption force between the lithium battery core and the blocking block is reduced, and further avoids the lithium battery core from falling from a high place and causing damage to the lithium battery core, thereby reducing the operator's work intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the overall structure of the electric-controlled telescopic rod and the blocking block of the present invention; Figure 3 It is a front view of the internal structure of the blocking block of the present invention; Figure 4 For the present invention Figure 3 A magnified view of the structure at center A; Figure 5 This is a schematic diagram of the internal structure of the blocking block of the present invention; Figure 6 It is a schematic diagram of the internal structure of part of the guide rod and the balloon of the present invention; Figure 7 For the present invention Figure 6 A magnified view of the structure at B in the middle; Figure 8 It is a schematic diagram of the internal structure of part of the loading plate and the limiting cylinder of the present invention; Fig. 9 It is a schematic diagram of the overall structure of part of the soft board, pressure sensor and connecting block of the present invention.

[0018] In the figure: 1. loading plate; 2. bracket; 3. electrically controlled telescopic rod; 4. expansion assembly; 41. limiting cylinder; 42. blocking block; 43. air storage tank; 44. piston plate; 45. air injection head; 46. rectangular hole; 47. one-way valve; 48. first spring; 49. round hole; 410. electrically controlled valve; 5. blocking mechanism; 51. filling block; 52. sealing plate; 53. square rod; 54. second spring; 55. connecting hole; 56. valve core; 57. gasket; 6. supporting mechanism; 61. slide groove; 62. guide rod; 63. third spring; 64. annular groove; 65. balloon; 66. air guide hole; 67. pressure sensor; 68. soft pad; 69. limiting ring; 610. sealing ring; 611. connecting block. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Embodiment 1: The present invention provides a technical solution: Referring to Figure 1 - Fig. 9 The present invention discloses a lithium battery core expansion device, comprising a loading plate 1 on the top side of a workstation, a bracket 2 is fixedly installed at the rear end of the top side of the loading plate 1 by bolts, an electric control telescopic rod 3 is fixedly installed through the top of the bracket 2, a hole expansion component 4 is provided at the bottom end of the electric control telescopic rod 3, the hole expansion component 4 comprises a blocking block 42, an air storage tank 43 is opened in the blocking block 42, a piston plate 44 is slidably installed in the air storage tank 43, and the driving end of the electric control telescopic rod 3 slides through the cylinder wall of the blocking block 42 and is connected to the piston plate 44. A limit cylinder 41 is fixedly installed at the position of the blocking block 42 on the top side of the carrier plate 1 by bolts, and a gas injection head 45 is fixedly installed at the center position of the bottom side of the blocking block 42. Two rectangular holes 46 are relatively provided on the inner bottom wall of the gas storage tank 43. A one-way valve 47 is fixedly installed in the cylinder wall of the blocking block 42, and the inside of the gas inlet of the one-way valve 47 is communicated with the inside of the gas storage tank 43. The exhaust end of the one-way valve 47 is inserted into the top opening of the gas injection head 45 and is fixedly connected to the gas injection head 45; A blocking mechanism 5 is provided at a position on the blocking block 42 corresponding to the rectangular hole 46 , and a supporting mechanism 6 is provided on the blocking block 42 and the limiting cylinder 41 .

[0021] In this embodiment, when the improved lithium battery core expansion device is used, the operator first inserts the lithium battery core into the limiting cylinder 41 until the bottom end of the lithium battery core contacts the inner bottom wall of the limiting cylinder 41. At this time, due to the constraint and limitation of the lithium battery core by the limiting cylinder 41, the lithium battery core can be constrained and limited by the outer peripheral side of the lithium battery core. Then the operator starts the device by controlling the button, and the electric-controlled telescopic rod stretches to push the blocking block 42 in the direction of the limiting cylinder 41. At this time, the support mechanism 6 can perform alignment detection of the blocking block 42 and the limiting cylinder 41, so that the operation of the electric-controlled telescopic rod 3 is stopped in time when the blocking block 42 is misaligned with the limiting cylinder 41, so as to avoid the blocking block 42 and the limiting cylinder 41 being misaligned and fitting, resulting in damage to the device or the lithium battery core, and prompting the operator to perform maintenance of the device in time; In the process of the blocking block 42 and the limiting cylinder 41 approaching each other, if there is no misalignment between the blocking block 42 and the limiting cylinder 41, then in the process of the blocking block 42 continuing to move downward, the support mechanism 6 can constrain and guide the moving trajectory of the blocking block 42, so that the bottom end of the blocking block 42 can be directly inserted into the top opening of the limiting cylinder 41. After the bottom end of the blocking block 42 is inserted into the top opening of the limiting cylinder 41, the blocking block 42 and the top of the limiting cylinder 41 conflict with each other. At this time, the bottom side of the blocking block 42 and the inner bottom wall of the limiting cylinder 41 are tightly fitted with the upper and lower sides of the lithium battery core respectively, and finally the upper and lower openings of the center hole of the lithium battery core are blocked, so that a relatively closed cavity is formed inside the center hole of the lithium battery core. After the bottom side of the blocking block 42 is fitted with the top side of the lithium battery core, due to the mutual interference between the blocking block 42 and the limiting cylinder 41, the continued downward movement of the electric control telescopic rod 3 will not continue to push the blocking block 42 downward. At this time, the electric control telescopic rod 3 is rapidly stretched, and then the piston plate 44 is rapidly pushed downward, so that the gas in the gas storage tank 43 is rapidly pushed into the one-way valve 47, and the gas is introduced into the center hole of the lithium battery core by the gas injection head 45. At this time, due to the close contact between the two ends of the lithium battery core and the bottom side of the blocking block 42 and the inner bottom wall of the limiting cylinder 41, only a small amount of gas injected into the center hole will be discharged, and a high-strength high-pressure cavity is rapidly formed in the center hole of the lithium battery core. Due to the push of the gas on the diaphragm, the diaphragm expands outward, thereby driving the center hole of the entire lithium battery core to expand, and almost no damage is caused to the inner layer of the lithium battery core, thereby reducing the scrap probability of the lithium battery core during the expansion operation of the center hole, and reducing the production cost of lithium batteries; After the hole expansion operation of the lithium battery core is completed, the electric control telescopic rod 3 contracts rapidly, driving the piston plate 44 to move upward until the piston plate 44 and the inner wall of the gas storage tank 43 collide with each other. Due to the obstruction of the one-way valve 47, the gas in the central hole of the lithium battery core will not flow into the gas storage tank 43 from the gas injection hole, and at the same time, the blocking mechanism 5 releases the blocking state of the rectangular hole 46. At the same time, due to the obstruction of the rectangular hole 46 by the lithium battery core, only a small amount of external gas will flow into the gas storage tank 43, and finally a corresponding The negative pressure chamber has a strong negative pressure, and an adsorption force of corresponding strength is generated between the lithium battery core and the blocking block 42. Then, the electric-controlled telescopic rod 3 continues to contract, and the blocking block 42 can be driven to move up and reset due to the mutual interference between the piston plate 44 and the inner wall of the gas storage tank 43. At this time, due to the pulling of the lithium battery core by the above-mentioned adsorption force, the lithium battery core can be directly taken out of the limiting cylinder 41 during the upward movement of the blocking block 42, without the operator performing other operations, thereby automatically completing the unloading operation of the lithium battery core. After the unloading operation of the lithium battery core is completed, the support mechanism 6 can constrain the lithium battery core at multiple positions on the outer peripheral side of the lithium battery core and multiple positions on the bottom side of the lithium battery core, so that the operator does not need to perform the lithium battery core taking operation at the required time, and avoids the lithium battery core falling from a high place to cause damage to the lithium battery core, thereby reducing the work intensity of the operator; After the blocking block 42 is moved upward and reset, the external gas can be introduced into the gas storage tank 43 in time through the blocking mechanism 5, so as to avoid that after the lithium battery core is taken out from the limiting cylinder 41, the gas storage tank 43 is still in a negative pressure state, which affects the operator's material taking operation, and at the same time, the lithium battery core and the blocking block 42 are prevented from contacting each other for a long time, causing damage to the lithium battery core; It should be noted that a control host is installed in the storage box of the above-mentioned workstation to control the operating state of the device, and a control button is installed on the top side of the above-mentioned loading plate 1 to control the start of the device.

[0022] In a further preferred embodiment of the present invention, Figure 3 and Figure 5 As shown, two first springs 48 are disposed between the piston plate 44 and the inner wall of the air storage tank 43, and both ends of each first spring 48 are fixedly connected to the bottom side of the piston plate 44 and the inner bottom wall of the air storage tank 43, respectively, and the two first springs 48 are located between the two rectangular holes 46; In this embodiment, when the above-mentioned electric telescopic rod 3 pulls the piston plate 44 to move upward, due to the push of the first spring 48 on the piston plate 44 and the blocking block 42, during the rapid contraction of the electric telescopic rod 3, the blocking block 42 is first still tightly attached to the top of the limiting cylinder 41, and at the same time the piston plate 44 rises rapidly until the piston plate 44 and the inner wall of the air storage tank 43 collide with each other, and then the electric telescopic rod 3 that continues to contract will drive the blocking block 42 to move upward. When the electric telescopic rod 3 pulls the blocking block 42 to move upward, a strong negative pressure chamber can be stably formed in the air storage tank 43, so that when the electric telescopic rod 3 contracts, the lithium battery core can be stably pulled out of the limiting cylinder 41.

[0023] In a further preferred embodiment of the present invention, Figure 1 and Figure 8 As shown, a circular hole 49 is opened at the position corresponding to the limiting cylinder 41 on the carrier plate 1, and an electric control valve 410 is fixedly installed and penetrated at the center position of the bottom end of the limiting cylinder 41, and the top end of the electric control valve 410 is coplanar with the inner bottom wall of the limiting cylinder 41, the diameter of the top end of the electric control valve 410 is the same as the diameter of the gas injection head 45, and the bottom end of the electric control valve 410 is inserted into the circular hole 49; In this embodiment, after the expansion operation of the center hole of the lithium battery core is completed, the electric control valve 410 is opened, and the gas in the center hole of the lithium battery core is discharged to the outside through the electric control valve 410 and the circular hole 49 to relieve the high pressure state in the center hole of the lithium battery core, and avoid the formation of a negative pressure cavity in the gas storage tank 43. The pressure difference at both ends of the rectangular hole 46 is too large, which increases the amount of external gas flowing into the gas storage tank 43.

[0024] In a further preferred embodiment of the present invention, Figure 3 and Figure 5 As shown, the blocking mechanism 5 includes a filling block 51, which is arranged in the corresponding rectangular hole 46, and the outer peripheral wall of the filling block 51 contacts the inner wall of the corresponding rectangular hole 46, and the upper and lower ends of the filling block 51 are coplanar with the inner bottom wall of the gas storage tank 43 and the bottom side of the blocking block 42, respectively, and a sealing plate 52 is fixedly installed on the top side of the filling block 51, and the bottom side of the sealing plate 52 contacts the inner bottom wall of the gas storage tank 43; In the present embodiment, after the bottom end of the above-mentioned blocking block 42 is inserted into the top opening of the limiting cylinder 41, due to the filling of the rectangular hole 46 by the filling block 51, the contact surface between the blocking block 42 and the lithium battery core is always a relatively flat plane, thereby avoiding that when the bottom side of the blocking block 42 is fitted with the top side of the lithium battery core to limit the lithium battery core, the lithium battery core and the sharp opening edge of the rectangular hole 46 collide with each other, causing damage to the lithium battery core.

[0025] In a further preferred embodiment of the present invention, Figure 3As shown, two L-shaped square rods 53 are relatively fixedly installed at the positions corresponding to the sealing plates 52 on the inner peripheral wall of the air storage tank 43, the bottom ends of the square rods 53 slide through the corresponding sealing plates 52 and the corresponding filling blocks 51, the bottom sides of the square rods 53 are coplanar with the bottom sides of the corresponding filling blocks 51, and a second spring 54 is wound around the outer peripheral side of the bottom of the square rods 53, and the two ends of the second spring 54 are respectively fixedly connected to the outer wall of the corresponding square rods 53 and the top side of the corresponding sealing plates 52; In this embodiment, during the use of the above device, the second spring 54 can continuously apply a thrust to the sealing plate 52 toward the rectangular hole 46, so that the sealing plate 52 is always in contact with the inner bottom wall of the gas storage tank 43 without being subjected to external force, and the blocking block 42 is always inserted into the rectangular hole 46 without being subjected to external force, thereby completing the filling operation of the rectangular hole 46; During the process of pulling out or inserting the blocking block 42 from the rectangular hole 46 , due to the constraint and limitation of the square rod 53 , the sealing plate 52 and the blocking block 42 always move in a linear trajectory, so that there will be no position deviation during the movement of the blocking block 42 , resulting in the inability to insert the blocking block 42 into the rectangular hole 46 .

[0026] In a further preferred embodiment of the present invention, Figure 2 - Figure 5 As shown, a plurality of connection holes 55 are provided in a circumferential array on the top side of the blocking block 42, a valve core 56 is fixedly installed and penetrated at the position corresponding to the connection hole 55 on the piston plate 44, and the top of the valve core 56 penetrates the corresponding connection hole 55 and is matched with the inner wall gap of the corresponding connection hole 55, the pressing end of the valve core 56 is in contact with the outer shell wall of the electric control telescopic rod 3, a gasket 57 is provided between the plurality of valve cores 56, and the bottom side of the gasket 57 is fixedly connected to the top side of the blocking block 42, the inner ring wall of the gasket 57 is slidably connected to the driving rod of the electric control telescopic rod 3, and the top side of the gasket 57 is in contact with the outer shell wall of the electric control telescopic rod 3; In this embodiment, when the piston plate 44 moves up and down in the gas storage tank 43, the gas at the top of the gas storage tank 43 can flow out of the gas storage tank 43 through the connecting hole 55, or the external gas can flow into the gas storage tank 43 through the connecting hole 55, thereby preventing the piston plate 44 from forming a high pressure or negative pressure cavity at the top of the gas storage tank 43 and affecting the movement of the piston plate 44 in the gas storage tank 43 during the process of the piston plate 44 moving up and down in the gas storage tank 43; After the blocking block 42 is moved upward and reset, due to the mutual interference between the pressing end of the valve core 56 and the outer shell of the electric control telescopic rod 3, the valve core 56 opens, and the external gas quickly passes through the valve core 56 and flows into the gas storage tank 43, so that the negative pressure intensity in the gas storage tank 43 is quickly reduced and disappears, so that the adsorption force between the blocking block 42 and the lithium battery core is quickly reduced to zero, thereby preventing the lithium battery core from being subjected to the adsorption force for a long time, causing the top of the lithium battery core to be deformed and damaged; During the upward resetting process of the blocking block 42 , due to the mutual interference between the backing ring 57 and the housing of the electric control telescopic rod 3 , the pressing end of the valve core 56 will not be over-pressed to cause damage to the valve core 56 .

[0027] In a further preferred embodiment of the present invention, Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the support mechanism 6 includes a plurality of guide rods 62, a plurality of slide grooves 61 are provided on the bottom side of the blocking block 42 in a circular array, and the plurality of slide grooves 61 are all located on the outer peripheral side of the air storage tank 43, the top end of the guide rod 62 is located in the corresponding slide groove 61 and is slidably connected to the inner wall of the corresponding slide groove 61, a third spring 63 is provided in the slide groove 61, and the two ends of the third spring 63 are respectively fixedly connected to the top end of the corresponding guide rod 62 and the inner top wall of the corresponding slide groove 61, an annular groove 64 is provided on the outer peripheral wall of the bottom of the guide rod 62, a balloon 65 is sleeved in the annular groove 64, and the inner wall of the bottom opening of the balloon 65 is fixedly connected to the inner wall of the corresponding annular groove 64, the top end of the balloon 65 is gap-matched with the inner top wall of the corresponding annular groove 64, and the balloon 65 is filled with air; In this embodiment, after the above-mentioned lithium battery core is pulled out of the limiting cylinder 41, the balloon 65 and the outer ring edge of the bottom side of the lithium battery core are in conflict with each other, so that the guide rod 62 and the balloon 65 cooperate with each other, and the lithium battery core is constrained and limited at multiple positions on the bottom side and the outer peripheral side of the lithium battery core, so that the lithium battery core is placed more stably on the bottom side of the blocking block 42.

[0028] In a further preferred embodiment of the present invention, Figure 8 and Fig. 9 As shown, a plurality of air guide holes 66 are formed in a circular array at the top of the limiting cylinder 41, the interior of the air guide hole 66 is communicated with the interior of the circular hole 49, a pressure sensor 67 is fixedly installed in the bottom opening of the air guide hole 66 through a plurality of connecting blocks 611, a soft pad 68 is fixedly installed at the top of the pressure sensor 67, and the outer peripheral wall of the soft pad 68 is in contact with the inner wall of the corresponding air guide hole 66; In this embodiment, when the blocking block 42 and the limiting cylinder 41 are approaching each other, if there is a misalignment between the blocking block 42 and the limiting cylinder 41, the guide rod 62 will collide with the top of the limiting cylinder 41, and part of the guide rod 62 will gradually retract into the slide groove 61 to compress the third spring 63. At this time, the pressure sensor 67 cannot detect the flow of air in the air guide hole 66 within the corresponding time after the electric control telescopic rod 3 is started. At this time, the control host control device immediately suspends operation to avoid damage to the device; If there is no misalignment between the blocking block 42 and the limiting cylinder 41, then in the process of the blocking block 42 approaching the limiting cylinder 41, the guide rod 62 directly drives the balloon 65 to be inserted into the air guide hole 66, so that the gas in the air guide hole 66 applies a pressure to the pressure sensor 67 through the soft board. At this time, the control host of the device can determine that there is no misalignment between the blocking block 42 and the limiting cylinder 41 based on the pressure changes monitored by the pressure sensor 67, and the device can operate normally.

[0029] In a further preferred embodiment of the present invention, Figure 6 and Figure 7 As shown, a limiting ring 69 is fixedly installed in the top opening of the balloon 65, and the inner ring wall of the limiting ring 69 contacts the inner wall of the corresponding annular groove 64, and a sealing ring 610 is fixedly installed in the ring wall of the limiting ring 69, and the inner ring wall of the sealing ring 610 contacts the inner ring wall of the corresponding annular groove 64; In this embodiment, during the process of the guide rod 62 pushing the balloon 65 into the air guide hole 66, as the balloon 65 shrinks and deforms, the limit ring 69 can be synchronously pushed to slide in the annular groove 64, thereby changing the position of the top opening of the balloon 65 in the annular groove 64, leaving space for the balloon wall of the balloon 65 to shrink into the annular groove 64, thereby preventing the balloon wall of the balloon 65 from moving to the outer peripheral side of the guide rod 62 during the process of shrinkage and deformation, affecting the insertion of the guide rod 62 into the air guide groove. At the same time, due to the push of the gas in the balloon 65 on the balloon wall, after the balloon 65 is inserted into the air guide hole 66, part of the outer wall of the balloon 65 is in close contact with the inner wall of the air guide hole 66, and the balloon 65 can be used as a sealing ring between the guide rod 62 and the inner wall of the air guide hole 66.

[0030] Working principle: When the improved lithium battery core expansion device is used, the operator first inserts the lithium battery core into the limiting cylinder 41 until the bottom end of the lithium battery core contacts the inner bottom wall of the limiting cylinder 41. At this time, due to the restriction of the limiting cylinder 41 on the lithium battery core, the lithium battery core can be restricted by the outer peripheral side of the lithium battery core. After the installation of the lithium battery coil core is completed, the operator starts the device through the control button, and the electric telescopic rod 3 starts to slowly push the blocking block 42 downward. When the bottom end of the guide rod 62 is close to the air guide hole 66, if there is a misalignment between the blocking block 42 and the limiting cylinder 41, the guide rod 62 will conflict with the top of the limiting cylinder 41, and part of the guide rod 62 will gradually retract into the slide groove 61 to compress the third spring 63. At this time, the pressure sensor 67 cannot detect the flow of air in the air guide hole 66 within the corresponding time after the electric telescopic rod 3 is started. At this time, the control host control device immediately suspends operation, and at the same time makes the electric telescopic rod 3 retract and reset, and warns the operator that the device needs to be repaired; When the guide rod 62 approaches the air guide hole 66, if there is no misalignment between the blocking block 42 and the limiting cylinder 41, the bottom end of the guide rod 62 is directly inserted into the air guide hole 66 due to the push of the third spring 63 on the guide rod 62, and in the process of the bottom of the guide rod 62 being inserted into the air guide hole 66, due to the mutual interference between the top opening edge of the air guide hole 66 and the balloon 65, the balloon 65 shrinks and deforms so that the guide rod 62 can push the balloon 65 into the air guide hole 66. At this time, part of the outer wall of the balloon 65 fits with the inner wall of the air guide hole 66 to form a sealing structure between the guide rod 62 and the inner wall of the air guide hole 66, so that when the guide rod 62 is inserted into the air guide hole 66, the air in the air guide hole 66 is pushed downward. At this time, due to the push of the gas on the soft pad 68, the outer part of the soft pad 68 is bent and deformed, and the blocking state of the bottom opening of the air guide hole 66 is released. Finally, the gas in the air guide hole 66 passes through the gap between the connecting block 611, the pressure sensor 67 and the inner wall of the air guide hole 66 and is discharged from the bottom opening of the air guide hole 66. At the same time, as the soft pad 68 is deformed, a thrust can be applied to the pressure sensor 67. The pressure sensor 67 detects a pressure change. The control host can determine that the gas in the air guide hole 66 has changed according to the pressure change detected by the pressure sensor 67, thereby determining that the bottom of the guide rod 62 has been inserted into the air guide hole 66. At this time, the control host control device continues to operate; It should be noted that, during the process of the above-mentioned balloon 65 shrinking and deforming, the limiting ring 69 will be synchronously pushed to slide in the annular groove 64, changing the position of the top opening of the balloon 65, leaving space for the balloon wall 65 to shrink into the annular groove 64, thereby preventing the balloon wall 65 from moving to the outer peripheral side of the guide rod 62 during the process of shrinking and deforming, affecting the insertion of the guide rod 62 into the air guide groove. At the same time, due to the push of the balloon wall 65 by the gas in the balloon 65, after the balloon 65 is inserted into the air guide hole 66, part of the outer wall of the balloon 65 is in close contact with the inner wall of the air guide hole 66; After the bottom of the guide rod 62 is inserted into the air guide hole 66, due to the mutual interference between the outer peripheral wall of the guide rod 62 and the inner wall of the air guide hole 66, the downward-moving blocking block 42 moves in a linear trajectory, so that the bottom end of the blocking block 42 can be directly inserted into the top opening of the limiting cylinder 41 until the blocking block 42 and the limiting cylinder 41 interfere with each other, and at this time, the bottom side of the blocking block 42 and the inner bottom wall of the limiting cylinder 41 are respectively tightly fitted with the upper and lower ends of the lithium battery winding core, so as to block the openings at the upper and lower ends of the center hole of the lithium battery winding core to the greatest extent; After the bottom end of the blocking block 42 is inserted into the top opening of the limiting cylinder 41, the blocking block 42 cannot continue to move downward due to the mutual interference between the blocking block 42 and the limiting cylinder 41. At this time, the electrically controlled telescopic rod 3 is stretched rapidly, and the stretched electrically controlled telescopic rod 3 pushes the piston plate 44 to move downward rapidly until the compression of the first spring 48 by the piston plate 44 reaches the limit. At this time, the rapidly moving downward piston plate 44 pushes the excess gas in the gas storage tank 43 into the one-way valve 47, and quickly injects the gas into the inner hole of the lithium battery core through the gas injection head 45. At this time, since the amount of gas flowing out from the upper and lower ends of the inner hole of the lithium battery core is extremely small, a high-strength high-pressure chamber is quickly formed in the lithium battery core. Due to the push of the gas on the diaphragm, the diaphragm expands outward, thereby driving the center hole of the entire core to expand. After the hole expansion operation of the lithium battery core is completed, the electric control valve 410 is opened, and the gas in the center hole of the lithium battery core flows out directly from the electric control valve 410, so that the high-pressure chamber inside the center hole of the lithium battery core disappears, and then the electric control telescopic rod 3 contracts rapidly. Due to the push of the first spring 48 on the piston plate 44 and the blocking block 42, during the rapid contraction of the electric control telescopic rod 3, first, the blocking block 42 is still tightly attached to the top of the limit cylinder 41, and at the same time, the piston plate 44 rises rapidly until the piston plate 44 and the inner wall of the gas storage tank 43 conflict with each other, and then the electric control telescopic rod 3 that continues to contract will drive the blocking block 42 to move upward; It should be noted that, during the upward movement of the piston plate 44, the gas at the top of the gas storage tank 43 is discharged from the connecting hole 55, so that the top of the gas storage tank 43 does not form a high-pressure chamber to affect the pressing of the first spring 48 on the blocking block 42, and after the piston plate 44 and the inner wall of the gas storage tank 43 collide with each other, the top of the valve core 56 directly passes through the connecting hole 55; During the upward movement of the piston plate 44, the outside air cannot flow into the gas storage tank 43 from the gas injection head 45 due to the obstruction of the one-way valve 47, so that a negative pressure chamber is formed in the gas storage tank 43. At this time, due to the pressure difference at both ends of the filling block 51 and the push of the gas on the filling block 51, the filling block 51 automatically slides out of the rectangular hole 46 to release the blocking state of the rectangular hole 46, and finally a corresponding adsorption force is formed between the blocking block 42 and the lithium battery coil core; After the blocking state of the rectangular hole 46 is released, since the bottom side of the blocking block 42 is tightly attached to the top side of the lithium battery core, there will be only a very small gap between the blocking block 42 and the lithium battery core. At this time, only a very small amount of external gas will flow into the rectangular hole 46 from the gap between the blocking block 42 and the top side of the lithium battery core, and then pass through the rectangular hole 46 into the gas storage tank 43, and the negative pressure strength in the gas storage tank 43 will slowly decrease; After the piston plate 44 and the inner wall of the gas storage tank 43 collide with each other, the adsorption force between the blocking block 42 and the lithium battery core reaches a maximum value, and then as the blocking block 42 moves upward, the adsorption force between the blocking block 42 and the lithium battery core offsets the friction between the lithium battery core and the inner wall of the limiting cylinder 41, so that the lithium battery core can be directly pulled out of the limiting cylinder 41 during the upward movement of the blocking block 42, completing the material removal operation of the lithium battery core in the limiting cylinder 41; As the blocking block 42 moves upward, the guide rod 62 can be synchronously driven to slide out of the air guide hole 66. After the lithium battery core is taken out of the limiting cylinder 41, the balloon 65 is subsequently pulled out of the air guide hole 66. At this time, due to the push of the balloon wall by the gas in the balloon 65, the balloon 65 expands again, and the expanded balloon 65 and the outer ring edge of the bottom side of the lithium battery core are in conflict with each other, so that the lithium battery core is constrained and limited by multiple positions on the bottom side and the outer peripheral side of the lithium battery core through the cooperation between the guide rod 62 and the balloon 65, so that the lithium battery core is relatively stably placed on the bottom side of the blocking block 42. After the above-mentioned electric control telescopic rod 3 drives the loading plate 1 to reset, due to the mutual interference between the pressing end of the valve core 56 and the outer shell wall of the electric control telescopic rod 3, the valve core 56 opens, and the external gas quickly passes through the valve core 56 and flows into the gas storage tank 43, so that the negative pressure intensity in the gas storage tank 43 is quickly reduced and disappears, so that the adsorption force between the blocking block 42 and the lithium battery core is quickly reduced to zero, thereby preventing the lithium battery core from being subjected to the adsorption force for a long time, causing the top of the lithium battery core to be deformed and damaged; It should be noted that after the negative pressure state in the gas storage tank 43 is released, due to the push of the second spring 54 on the blocking block 42, the filling block 51 is automatically reinserted into the rectangular groove, and the sealing plate 52 is automatically reset to fit the bottom wall of the gas storage tank 43, thereby automatically completing the filling and blocking of the rectangular hole 46, and finally making the bottom side of the carrier plate 1 form a flat surface again, avoiding the lithium battery core and the sharp opening edge of the rectangular hole 46 from colliding with each other during the hole expansion operation of the center hole of the lithium battery core, resulting in damage to the lithium battery core; After the negative pressure state in the above-mentioned air storage tank 43 is released, the operator can pinch the lithium battery core with his fingers and pull the lithium battery core downward. As the balloon 65 shrinks and deforms, the lithium battery core can be directly taken out from between the several guide rods 62, and then the above-mentioned operation can be repeated to continuously complete the hole expansion process of the center hole of the lithium battery core.

[0031] Embodiment 2: A hole expansion method, including the above-mentioned lithium battery core hole expansion device, specifically includes the following steps: Step 1: First, the operator inserts the lithium battery core into the limiting cylinder 41 until the bottom side of the lithium battery core contacts the inner bottom wall of the limiting cylinder 41; Step 2: The operator starts the electric telescopic rod 3, which is stretched to slowly push the blocking block 42 in the direction of the limiting cylinder 41 until the blocking block 42 and the limiting cylinder 41 collide with each other. Then, the electric telescopic rod 3 is stretched rapidly to push the piston plate 44 downward rapidly, thereby forming a high-pressure chamber in the center hole of the lithium battery core, and the expansion operation of the center hole of the lithium battery core is completed by pushing the diaphragm with gas; Step 3: After the expansion operation of the center hole of the lithium battery core in step 2 is completed, the electrically controlled telescopic rod 3 is retracted to pull the piston plate 44 upward and reset, and after the piston plate 44 and the inner wall of the gas storage tank 43 collide with each other, the blocking block 42 is driven to move upward and reset. At this time, a negative pressure chamber is formed in the gas storage tank 43 to absorb the lithium battery core and move it out of the limiting cylinder 41; Step 4: After the lithium battery core is removed from the limiting cylinder 41 in step 3, the operator pinches the lithium battery core and pulls the lithium battery core downward to remove the lithium battery core from between the plurality of guide rods 62, and the unloading operation of the lithium battery core is completed; In this embodiment, the device is easy to operate and has a high degree of automation, which facilitates the use of the device.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium battery core expansion device, comprising a loading plate (1) at the top side of a workstation, characterized in that: The rear end of the top side of the carrier plate (1) is fixedly provided with a bracket (2) by means of bolts, the top of the bracket (2) is fixedly penetrated with an electric-controlled telescopic rod (3), the bottom end of the electric-controlled telescopic rod (3) is provided with a hole-expanding assembly (4), the hole-expanding assembly (4) comprises a blocking block (42), an air storage tank (43) is provided in the blocking block (42), a piston plate (44) is slidably provided in the air storage tank (43), and the driving end of the electric-controlled telescopic rod (3) slides through the cylinder wall of the blocking block (42) and is fixedly connected to the piston plate (44), the carrier plate (1) A limiting cylinder (41) is fixedly installed at a position corresponding to the blocking block (42) on the top side thereof by means of bolts, a gas injection head (45) is fixedly installed and penetrated at a central position of the bottom side of the blocking block (42), two rectangular holes (46) are provided on the inner bottom wall of the gas storage tank (43) in a relative manner, a one-way valve (47) is fixedly installed in the cylinder wall of the blocking block (42), and the interior of the gas inlet of the one-way valve (47) is communicated with the interior of the gas storage tank (43), and the exhaust end of the one-way valve (47) is inserted into the top opening of the gas injection head (45) and is fixedly connected to the gas injection head (45); A blocking mechanism (5) is provided at a position on the blocking block (42) corresponding to the rectangular hole (46), and a supporting mechanism (6) is provided on the blocking block (42) and the limiting cylinder (41).

2. A lithium battery core expansion device according to claim 1, characterized in that: Two first springs (48) are disposed opposite to each other between the piston plate (44) and the inner wall of the air storage tank (43), and both ends of each first spring (48) are fixedly connected to the bottom side of the piston plate (44) and the inner bottom wall of the air storage tank (43), respectively, and the two first springs (48) are located between the two rectangular holes (46).

3. A lithium battery core expansion device according to claim 2, characterized in that: A circular hole (49) is provided on the carrier plate (1) at a position corresponding to the limiting cylinder (41); an electrically controlled valve (410) is fixedly installed and penetrated at the center position of the bottom end of the limiting cylinder (41); the top end of the electrically controlled valve (410) is coplanar with the inner bottom wall of the limiting cylinder (41); the diameter of the top end of the electrically controlled valve (410) is the same as the diameter of the gas injection head (45); and the bottom end of the electrically controlled valve (410) is inserted into the circular hole (49).

4. A lithium battery core expansion device according to claim 3, characterized in that: The blocking mechanism (5) comprises a filling block (51), the filling block (51) being arranged in the corresponding rectangular hole (46), and the outer peripheral wall of the filling block (51) being in contact with the inner wall of the corresponding rectangular hole (46), the upper and lower ends of the filling block (51) being coplanar with the inner bottom wall of the gas storage tank (43) and the bottom side of the blocking block (42), respectively, and a sealing plate (52) being fixedly mounted on the top side of the filling block (51), and the bottom side of the sealing plate (52) being in contact with the inner bottom wall of the gas storage tank (43).

5. A lithium battery core expansion device according to claim 4, characterized in that: Two L-shaped square rods (53) are relatively fixedly installed at positions corresponding to the sealing plate (52) on the inner peripheral wall of the gas storage tank (43), the bottom ends of the square rods (53) slide through the corresponding sealing plate (52) and the corresponding filling block (51), the bottom side of the square rods (53) is coplanar with the bottom side of the corresponding filling block (51), and a second spring (54) is wound around the outer peripheral side of the bottom of the square rod (53), and the two ends of the second spring (54) are respectively fixedly connected to the outer wall of the corresponding square rod (53) and the top side of the corresponding sealing plate (52).

6. A lithium battery core expansion device according to claim 5, characterized in that: A plurality of connection holes (55) are provided in a circular array on the top side of the blocking block (42); a valve core (56) is fixedly installed and penetrated at a position corresponding to the connection hole (55) on the piston plate (44); the top of the valve core (56) penetrates the corresponding connection hole (55) and is gap-matched with the inner wall of the corresponding connection hole (55); a pressing end of the valve core (56) contacts the outer shell wall of the electric-controlled telescopic rod (3); a gasket (57) is provided between the plurality of valve cores (56); the bottom side of the gasket (57) is fixedly connected to the top side of the blocking block (42); the inner ring wall of the gasket (57) is slidably connected to the drive rod of the electric-controlled telescopic rod (3); and the top side of the gasket (57) contacts the outer shell wall of the electric-controlled telescopic rod (3).

7. A lithium battery core expansion device according to claim 6, characterized in that: The support mechanism (6) comprises a plurality of guide rods (62). The bottom side of the blocking block (42) is provided with a plurality of slide grooves (61) in a circular array, and the plurality of slide grooves (61) are all located on the outer peripheral side of the air storage tank (43). The top end of the guide rod (62) is located in the corresponding slide groove (61) and is slidably connected to the inner wall of the corresponding slide groove (61). A third spring (63) is provided in the slide groove (61), and the two ends of the third spring (63) are respectively fixedly connected to the top end of the corresponding guide rod (62) and the inner top wall of the corresponding slide groove (61). An annular groove (64) is provided on the outer peripheral wall of the bottom of the guide rod (62). A balloon (65) is sleeved in the annular groove (64), and the inner wall of the bottom opening of the balloon (65) is fixedly connected to the inner wall of the corresponding annular groove (64). The top end of the balloon (65) is gap-matched with the inner top wall of the corresponding annular groove (64), and the balloon (65) is filled with air.

8. A lithium battery core expansion device according to claim 7, characterized in that: The top end of the limiting cylinder (41) is provided with a plurality of air guide holes (66) in a circular array, the interior of the air guide holes (66) being in communication with the interior of the circular hole (49), a pressure sensor (67) being fixedly mounted in the bottom opening of the air guide holes (66) via a plurality of connecting blocks (611), a soft pad (68) being fixedly mounted on the top end of the pressure sensor (67), and an outer peripheral wall of the soft pad (68) being in contact with an inner wall of the corresponding air guide hole (66).

9. A lithium battery core expansion device according to claim 8, characterized in that: A limiting ring (69) is fixedly installed in the top opening of the balloon (65), and the inner ring wall of the limiting ring (69) contacts the inner wall of the corresponding annular groove (64). A sealing ring (610) is fixedly installed in the ring wall of the limiting ring (69), and the inner ring wall of the sealing ring (610) contacts the inner ring wall of the corresponding annular groove (64).

10. A hole expansion method, comprising a lithium battery core hole expansion device according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: First, the operator inserts the lithium battery core into the limiting cylinder (41) until the bottom side of the lithium battery core contacts the inner bottom wall of the limiting cylinder (41); In step 2, the operator starts the electric telescopic rod (3), and the electric telescopic rod (3) is stretched to slowly push the blocking block (42) in the direction of the limiting cylinder (41) until the blocking block (42) and the limiting cylinder (41) contact each other, and then the electric telescopic rod (3) is rapidly stretched to push the piston plate (44) to rapidly move downward, thereby forming a high-pressure chamber in the center hole of the lithium battery core, and completing the hole expansion operation of the center hole of the lithium battery core by pushing the diaphragm with gas; Step three, after the expansion operation of the center hole of the lithium battery core in step two is completed, the electrically controlled telescopic rod (3) is retracted to pull the piston plate (44) upward to reset, and after the piston plate (44) and the inner wall of the gas storage tank (43) contact each other, the blocking block (42) is driven to move upward to reset, and at this time, a negative pressure chamber is formed in the gas storage tank (43) to absorb the lithium battery core and move it out of the limiting cylinder (41); In step 4, after the lithium battery core is removed from the limiting cylinder (41) in step 3, the operator pinches the lithium battery core by hand and pulls the lithium battery core downward to remove the lithium battery core from between the plurality of guide rods (62), and the unloading operation of the lithium battery core is completed.

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