Battery cell shaping and hot-pressing system

Abstract

The utility model provides a battery cell shaping and hot-pressing system, which comprises a conveying mechanism, a first magnetic induction heating piece, a transfer mechanism and a pressing mechanism, and is characterized in that the conveying mechanism is used for conveying a battery cell to be subjected to hot-pressing; the first magnetic induction heating piece is arranged on a transmission path of the conveying mechanism, is opposite to a transmission end face of the conveying mechanism at an interval and is used for cutting a current collector magnetic field to heat a battery cell; the transfer mechanism is arranged on one side of the conveying mechanism and is used for grabbing and transferring the magnetic induction heated battery cell to the pressing mechanism; the pressing mechanism is arranged on the side, far away from the conveying mechanism, of the transferring mechanism and used for pressing and shaping the heated battery cell, the battery cell shaping and hot-pressing system achieves rapid and accurate shaping treatment of the battery cell through the automatic conveying, heating and pressing processes, the production efficiency is improved, and the quality and stability of the battery cell are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core hot pressing, in particular to a battery core shaping hot pressing system. Background Art

[0002] In lithium-ion battery manufacturing, high pressure and high temperature are essential for achieving hot-pressing and shaping of battery cells. This process allows for rapid bonding and lamination between the separator and the electrode, preventing problems such as softening of the battery cell and swelling after charge and discharge cycles.

[0003] A battery cell preheating device and battery cell hot pressing equipment with publication number CN219659945U include a conveyor belt and a high-frequency induction heating coil; the high-frequency induction heating coil is arranged around the conveyor belt, and there is an angle between the surrounding direction of the high-frequency induction heating coil and the conveying direction of the conveyor belt; it also includes a fixed sleeve; the fixed sleeve surrounds the conveyor belt, and the center line of the fixed sleeve is parallel to the central axis of the high-frequency induction heating coil.

[0004] Conventional hot pressing and shaping processes require long preheating times for battery cells, and the efficiency of hot pressing and shaping is slow, seriously affecting the on-site production rhythm. In addition, for high-capacity and thick energy storage batteries, the path for external heat source to conduct to the interior of the battery cell is too long, and long preheating times cannot guarantee the consistency of the internal temperature of the battery cell, making it difficult to compact the battery cell and increasing the production pressure of mass production. Utility Model Content

[0005] In view of this, the utility model proposes a battery cell shaping and hot pressing system, which improves the heating efficiency of ultra-thick battery cells and thus improves production efficiency.

[0006] The technical solution of the present invention is implemented as follows: The present invention provides a battery cell shaping and hot pressing system, comprising:

[0007] A conveying mechanism for conveying the battery cells to be hot pressed;

[0008] The first magnetic induction heating element is arranged on the transmission path of the conveying mechanism and is spaced apart from the transmission end surface of the conveying mechanism to cut the magnetic field of the current collector to heat the battery core;

[0009] The transfer mechanism is provided on one side of the conveying mechanism and is used to grab and transfer the battery cells after magnetic induction heating to the pressing mechanism;

[0010] The pressing mechanism is arranged on the side of the transfer mechanism away from the conveying mechanism, and is used to press and shape the heated battery cells.

[0011] On the basis of the above technical solution, preferably, there are multiple first magnetic induction heating elements, and the multiple first magnetic induction heating elements are arranged in sequence with equal intervals along the conveying direction of the conveying mechanism.

[0012] On the basis of the above technical solution, preferably, a plurality of rotating mechanisms are further included, wherein each rotating mechanism is arranged on a side of the first magnetic induction heating element away from the conveying mechanism, and each rotating mechanism is arranged corresponding to the position of the first magnetic induction heating element, and the rotating mechanism has an axial end that can rotate circumferentially, and the axial end of each rotating mechanism is respectively fixedly connected to the axis of the corresponding first magnetic induction heating element, so as to drive the first magnetic induction heating element to rotate and accelerate the magnetic field cutting speed.

[0013] On the basis of the above technical solution, preferably, at least two magnetic baffles are further included, wherein at least two magnetic baffles are arranged between the conveying mechanism and the first magnetic induction heating element, and at least two magnetic baffles are arranged opposite to each other and at intervals, and the two opposite magnetic baffles respectively correspond to the positions of the pole ears on both sides of the battery core, and are used to prevent the magnetic field from heating the pole ears.

[0014] Based on the above technical solution, preferably, the distance between the two opposing magnetic baffles is equal to the width of the battery core, and the magnetic baffles are made of a magnetic material composed of transition elements iron, cobalt, nickel and alloys thereof.

[0015] On the basis of the above technical solution, preferably, the transfer mechanism includes a lifting component and a grabbing and moving component, wherein:

[0016] The lifting assembly is arranged on a side of the conveying mechanism away from the first magnetic induction heating element. The lifting assembly has a telescopic end that can move linearly back and forth toward the side of the conveying mechanism. The linear movement of the telescopic end is used to lift the heated battery cell upward and separate it from the end surface of the conveying mechanism.

[0017] The grabbing moving assembly is arranged on one side of the conveying mechanism and is used to convey the lifted battery cells to the workstation of the pressing mechanism.

[0018] On the basis of the above technical solution, preferably, the lifting component is one of an air cylinder, an oil cylinder or a linear module, and the grabbing and moving component is a manipulator.

[0019] On the basis of the above technical solution, preferably, the pressing mechanism includes a bracket, a pusher, an upper pressing die and a lower pressing die, wherein:

[0020] The bracket is relatively fixed on the ground;

[0021] The pushing member is arranged on the bracket, and the telescopic end of the pushing member is arranged vertically toward the ground;

[0022] The upper pressing die is fixed on the telescopic end of the pushing member;

[0023] The lower die is fixed on the bracket and matches the position of the upper die.

[0024] The pusher pushes the upper die toward the lower die to close the mold and press and shape the battery cell.

[0025] On the basis of the above technical solution, preferably, the pressing mechanism also includes a second magnetic induction heating element, wherein the upper die and the lower die are both made of non-metallic ceramic materials, and the second magnetic induction heating element is arranged on the side of the upper die away from the lower die, and the second magnetic induction heating element is used to perform electromagnetic heating when pressing and shaping the battery core.

[0026] Based on the above technical solution, preferably, the first magnetic induction heating element and the second magnetic induction heating element are both provided with a plurality of magnetic induction coils, and the plurality of magnetic induction coils all generate a magnetic field perpendicular to the surface of the battery core, and the battery core moves its current collector and the magnetic field induction generating circuit to heat the battery core.

[0027] The battery cell shaping and hot pressing system of the present invention has the following beneficial effects compared with the prior art:

[0028] (1) The battery core to be heated is continuously conveyed toward the first magnetic induction heating element by a conveying mechanism. The principle of magnetic induction is used to generate eddy currents by cutting the magnetic field of the current collector. When the eddy currents flow inside the battery core, heat is generated, thereby achieving rapid heating of the battery core. Electromagnetic heating can improve the temperature consistency inside and outside the battery core, effectively improve the battery core stratification problem caused by low internal temperature, and improve the heating efficiency and battery core quality.

[0029] (2) After the battery cells are heated, they are quickly grabbed and transported by the transfer mechanism and safely placed on the workstation of the pressing mechanism. The pressing mechanism presses and shapes the heated battery cells. The battery cell shaping hot pressing system realizes the rapid and precise shaping of the battery cells through the automated conveying, heating and pressing processes, which not only improves the production efficiency but also ensures the quality and stability of the battery cells.

[0030] (3) Setting a rotating magnetic induction disk can speed up the cutting speed of the magnetic induction line on the current collector inside the battery cell, enhance the induced current, and improve the heating efficiency of the battery cell;

[0031] (4) The second magnetic induction heating element can simultaneously perform electromagnetic heating during the pressing process of the ultra-thick battery cell to ensure the consistency of the temperature inside the battery cell, thereby ensuring that the positive electrode sheet, the negative electrode sheet and the isolation film in the ultra-thick battery cell can be more firmly bonded together, thereby improving the pressing and shaping efficiency of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a structural diagram of the battery cell shaping and hot pressing system of the present utility model;

[0034] Figure 2 This is a top view of the structure of the active part of the first magnetic induction heating element of the battery core shaping and hot pressing system of the present invention;

[0035] Figure 3 This is a structural schematic diagram of the pressing mechanism of the battery cell shaping and hot pressing system of the present invention;

[0036] Figure 4 This is a cross-sectional view of the structure of the first magnetic induction heating element of the battery core shaping and hot pressing system of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figure 1-4 As shown, the utility model is a battery cell shaping and hot pressing system, comprising a conveying mechanism 1, a first magnetic induction heating element 2, a transfer mechanism 3 and a pressing mechanism 4, wherein the conveying mechanism 1 is used to convey the battery cell to be hot pressed; the first magnetic induction heating element 2 is arranged on the transmission path of the conveying mechanism 1, and is arranged relative to the transmission end face of the conveying mechanism 1 at an interval, and is used to cut the collector magnetic field to heat the battery cell; the transfer mechanism 3 is arranged on one side of the conveying mechanism 1, and is used to grab the battery cell after magnetic induction heating and transfer it to the pressing mechanism 4; the pressing mechanism 4 is arranged on the side of the transfer mechanism 3 away from the conveying mechanism 1, and is used to press and shape the heated battery cell.

[0039] It should be noted that the conveying mechanism 1 continuously conveys the battery cells to be heated toward the side of the first magnetic induction heating element 2, and uses the principle of magnetic induction to generate eddy currents by cutting the magnetic field of the current collector. When the eddy currents flow inside the battery cells, they generate heat, thereby realizing rapid heating of the battery cells. Electromagnetic heating can improve the temperature consistency inside and outside the battery cells, and can effectively improve the battery cell stratification problem caused by low internal temperature, thereby improving the heating efficiency and battery cell quality. The transfer mechanism 3 quickly grabs and transfers the battery cells after heating, and safely places them on the work station of the pressing mechanism 4. The pressing mechanism 4 presses and shapes the heated battery cells. The battery cell shaping hot pressing system realizes rapid and precise shaping of the battery cells through automated conveying, heating and pressing processes, which not only improves production efficiency, but also ensures the quality and stability of the battery cells.

[0040] Specifically, the conveying mechanism 1 in this embodiment is a conveyor belt.

[0041] In this embodiment, there are multiple first magnetic induction heating elements 2 , and the multiple first magnetic induction heating elements 2 are arranged in sequence at equal intervals along the conveying direction of the conveying mechanism 1 .

[0042] It should be noted that multiple first magnetic induction heating elements 2 are arranged at equal intervals, which can ensure that the battery core is continuously heated by a uniform magnetic field during the transmission process, avoiding the problem of local overheating or insufficient heating that may be caused by a single heating point. As the battery core moves on the conveying mechanism 1, it passes through each first magnetic induction heating element 2 in turn, realizing a continuous heating process and improving the heating efficiency; and by adjusting the power and magnetic field strength of each heating element, the heating temperature of the battery core at different positions can be precisely controlled, thereby optimizing the overall heating effect.

[0043] This embodiment also includes multiple rotating mechanisms 5, wherein each rotating mechanism 5 is arranged on the side of the first magnetic induction heating element 2 away from the conveying mechanism 1, and each rotating mechanism 5 is arranged corresponding to the position of the first magnetic induction heating element 2, and the rotating mechanism 5 has an axial end that can rotate circumferentially, and the axial end of each rotating mechanism 5 is fixedly connected to the axis of the corresponding first magnetic induction heating element 2, and is used to drive the first magnetic induction heating element 2 to rotate and accelerate the magnetic field cutting speed.

[0044] It should be noted that in this embodiment, the rotating mechanism 5 is a driving motor, and the output shaft of the driving motor drives the first magnetic induction heating element 2 to rotate circumferentially. During the rotation, the magnetic induction coil 200 also rotates. The rotating magnetic induction coil 200 will accelerate the cutting speed of the magnetic induction line on the current collector inside the battery cell. The induced current generated by the current collector cutting the magnetic field is proportional to the cutting speed. The rotating first magnetic induction heating element 2 can accelerate the heating efficiency of the battery cell.

[0045] This embodiment also includes at least two magnetic baffles 6, wherein at least two magnetic baffles 6 are arranged between the conveying mechanism 1 and the first magnetic induction heating element 2, and at least two magnetic baffles 6 are arranged opposite to each other and at intervals, and the two opposite magnetic baffles 6 respectively correspond to the positions of the pole ears on both sides of the battery cell, and are used to prevent the magnetic field from heating the pole ears.

[0046] In addition, the distance between the two opposite magnetic baffles 6 is equal to the width of the battery core, and the magnetic baffles 6 are made of a magnetic material composed of transition elements iron, cobalt, nickel and alloys thereof.

[0047] It should be noted that the magnetic baffle 6 is located directly above the battery cell tab, and its width just meets the requirement of shielding the tab. During electromagnetic heating, the magnetic baffle 6 can block part of the magnetic field from heating the battery cell tab, preventing oxidation of the battery cell tab.

[0048] The transfer mechanism 3 in this embodiment includes a lifting component 31 and a grabbing and moving component 32, wherein the lifting component 31 is arranged on the side of the conveying mechanism 1 away from the first magnetic induction heating element 2, and the lifting component 31 has a telescopic end that can move linearly back and forth toward the side of the conveying mechanism 1, and the linear movement of the telescopic end is used to lift the heated battery cell upward and separate it from the end face of the conveying mechanism 1; the grabbing and moving component 32 is arranged on one side of the conveying mechanism 1, and is used to transport the lifted battery cell to the work station of the pressing mechanism 4.

[0049] Specifically, the lifting component 31 in this embodiment is one of an air cylinder, an oil cylinder or a linear module, and the grabbing and moving component 32 is a robot arm. This part is existing technology and will not be described in detail here.

[0050] The pressing mechanism 4 in this embodiment includes a bracket 41, a pushing member 42, an upper die 43 and a lower die 44, wherein the bracket 41 is relatively fixed on the ground; the pushing member 42 is arranged on the bracket 41, and the telescopic end of the pushing member 42 is vertically arranged toward the ground; the upper die 43 is fixed on the telescopic end of the pushing member 42; the lower die 44 is fixed on the bracket 41 and matches the position of the upper die 43, and the pushing member 42 pushes the upper die 43 toward the side of the lower die 44 to close the mold, thereby pressing and shaping the battery cell.

[0051] In addition, the pressing mechanism 4 also includes a second magnetic induction heating element 45, wherein the upper die 43 and the lower die 44 are both made of non-metallic ceramic materials, and the second magnetic induction heating element 45 is arranged on the side of the upper die 43 away from the lower die 44. The second magnetic induction heating element 45 is used to perform electromagnetic heating when pressing and shaping the battery cell.

[0052] It should be noted that the upper die 43 and the lower die 44 are both made of non-metallic ceramic materials to prevent the upper die 43 and the lower die 44 from deformation under high temperature and high pressure. The second magnetic induction heating element 45 can simultaneously perform electromagnetic heating during the pressing process of the ultra-thick battery cell to ensure the consistency of the internal temperature of the battery cell, thereby ensuring that the positive electrode sheet, the negative electrode sheet and the isolation membrane in the ultra-thick battery cell can be more firmly bonded together, thereby improving the pressing and shaping efficiency of the battery cell.

[0053] In this embodiment, the first magnetic induction heating element 2 and the second magnetic induction heating element 45 are both provided with a number of magnetic induction coils 200, and the said number of magnetic induction coils 200 all generate a magnetic field perpendicular to the surface of the battery core. The battery core moves its current collector and the magnetic field induction generating circuit to heat the battery core. The magnetic induction coil 200 generates a magnetic field perpendicular to the surface of the battery core. The battery core moves to generate a magnetic field, and the current collector in the battery core will undergo electromagnetic induction with the magnetic field, thereby generating an induced current to achieve battery core heating.

[0054] Working principle:

[0055] The conveying mechanism 1 continuously conveys the battery cell to be heated toward the side of the first magnetic induction heating element 2, and the rotating mechanism 5 drives the first magnetic induction heating element 2 to rotate. By utilizing the principle of magnetic induction, eddy currents are generated by cutting the magnetic field of the current collector. When the eddy currents flow inside the battery cell, heat is generated, thereby realizing rapid heating of the battery cell. The transfer mechanism 3 quickly grabs and transfers the battery cell after the heating is completed, and places it on the work station of the pressing mechanism 4. The pushing member 42 pushes the upper die 43 toward the lower die 44 to close the mold and press and shape the battery cell. The second magnetic induction heating element 45 can simultaneously perform electromagnetic heating on the ultra-thick battery cell during the pressing process to ensure the consistency of the internal temperature of the battery cell.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery cell shaping and hot pressing system, characterized in that: include: A conveying mechanism (1) is used for conveying the battery core to be hot pressed; A first magnetic induction heating element (2) is arranged on the transmission path of the conveying mechanism (1) and is spaced apart from the transmission end surface of the conveying mechanism (1) and is used to cut the collector magnetic field to heat the battery core; A transfer mechanism (3) is provided on one side of the conveying mechanism (1) and is used to grab and transfer the battery core after magnetic induction heating to the pressing mechanism (4); The pressing mechanism (4) is arranged on a side of the transfer mechanism (3) away from the conveying mechanism (1) and is used to press and shape the heated battery cells.

2. The battery cell shaping and hot pressing system according to claim 1, characterized in that: There are multiple first magnetic induction heating elements (2), and the multiple first magnetic induction heating elements (2) are arranged in sequence at equal intervals along the conveying direction of the conveying mechanism (1).

3. The battery cell shaping and hot pressing system according to claim 2, characterized in that: The invention also includes a plurality of rotating mechanisms (5), wherein each rotating mechanism (5) is arranged on a side of the first magnetic induction heating element (2) away from the conveying mechanism (1), and each rotating mechanism (5) is arranged corresponding to the position of the first magnetic induction heating element (2), and the rotating mechanism (5) has an axial end that can rotate in a circumferential direction, and the axial end of each rotating mechanism (5) is fixedly connected to the axis of the corresponding first magnetic induction heating element (2), and is used to drive the first magnetic induction heating element (2) to rotate and accelerate the magnetic field cutting speed.

4. The battery cell shaping and hot pressing system according to claim 3, characterized in that: The invention also includes at least two magnetic baffles (6), wherein the at least two magnetic baffles (6) are both arranged between the conveying mechanism (1) and the first magnetic induction heating element (2), and the at least two magnetic baffles (6) are arranged opposite to each other and at intervals, and the two opposite magnetic baffles (6) respectively correspond to the positions of the tabs on both sides of the battery core, and are used to prevent the magnetic field from heating the tabs.

5. The battery cell shaping and hot pressing system according to claim 4, characterized in that: The distance between the two opposing magnetic baffles (6) is equal to the width of the battery core, and the magnetic baffles (6) are made of a magnetic material composed of transition elements iron, cobalt, nickel and alloys thereof.

6. The battery cell shaping and hot pressing system according to claim 1, characterized in that: The transfer mechanism (3) includes a lifting component (31) and a grabbing and moving component (32), wherein: The lifting assembly (31) is arranged on a side of the conveying mechanism (1) away from the first magnetic induction heating element (2), and the lifting assembly (31) has a telescopic end that can move linearly back and forth toward the side of the conveying mechanism (1). The linear movement of the telescopic end is used to lift the heated battery cell upward and separate it from the end surface of the conveying mechanism (1); The grabbing and moving assembly (32) is arranged on one side of the conveying mechanism (1) and is used to convey the lifted battery core to the workstation of the pressing mechanism (4).

7. The battery cell shaping and hot pressing system according to claim 6, characterized in that: The lifting component (31) is one of an air cylinder, an oil cylinder or a linear module, and the grabbing and moving component (32) is a manipulator.

8. The battery cell shaping and hot pressing system according to claim 1, characterized in that: The pressing mechanism (4) comprises a bracket (41), a pusher (42), an upper pressing die (43) and a lower pressing die (44), wherein: The bracket (41) is relatively fixed on the ground; The pushing member (42) is arranged on the bracket (41), and the telescopic end of the pushing member (42) is vertically arranged toward the ground; The upper pressing die (43) is fixed on the telescopic end of the pushing member (42); The lower die (44) is fixed on the bracket (41) and matches the position of the upper die (43). The pusher (42) pushes the upper die (43) to move toward the lower die (44) to close the die, thereby pressing and shaping the battery cell.

9. The battery cell shaping and hot pressing system according to claim 8, characterized in that: The pressing mechanism (4) further includes a second magnetic induction heating element (45), wherein the upper pressing die (43) and the lower pressing die (44) are both made of non-metallic ceramic material, and the second magnetic induction heating element (45) is arranged on a side of the upper pressing die (43) away from the lower pressing die (44), and the second magnetic induction heating element (45) is used to perform electromagnetic heating when pressing and shaping the battery core.

10. The battery cell shaping and hot pressing system according to claim 9, characterized in that: The first magnetic induction heating element (2) and the second magnetic induction heating element (45) are both provided with a plurality of magnetic induction coils (200), and the plurality of magnetic induction coils (200) all generate a magnetic field perpendicular to the surface of the battery core. The battery core moves its current collector and the magnetic field induction generating circuit to heat the battery core.

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