Battery cell thermal complexing apparatus and method

Abstract

This invention provides a battery cell thermal bonding device and method. The battery cell thermal bonding device includes a first rotating mechanism, a second rotating mechanism, a transmission mechanism, and a hot-melt device. The first and second rotating mechanisms are arranged opposite to each other, with a gap between them. The transmission mechanism is located on one side of the first and / or second rotating mechanisms and is used to drive the battery cell through the gap. The hot-melt device is fixedly mounted on the first and / or second rotating mechanisms and is used to drive the hot-melt device to rotate. The hot-melt device is used to thermally bond the battery cell during rotation. The battery cell thermal bonding device of this invention stops the battery cell transport during bonding, resulting in high efficiency. Furthermore, the bonding method is achieved through extrusion by a heat-capacity module, which does not damage the powder layer of the battery cell and prevents powder shedding during subsequent cutting, thus ensuring the quality of the bonded battery cell.

Description

Technical Field

[0001] This invention relates to the field of battery cell manufacturing technology, and in particular to a battery cell thermal bonding equipment and method. Background Technology

[0002] With the development of new energy in China, new energy batteries are being used more and more widely due to their inherent advantages. Among the existing battery manufacturing technologies, the hot composite stacking method of battery cells is widely used. The general steps are as follows: before stacking, the positive electrode, negative electrode and separator are heated by a heating device, and then hot-rolled under appropriate pressure to make them stick together to form a composite unit. Then, the separator is cut by a hot cutter or other means. At the moment of cutting, the two layers of separator at the cut surface begin to fuse and stick together under the action of high temperature to achieve the purpose of sealing.

[0003] However, with the advancement of lithium-ion battery technology, the materials used in the cells have also changed. For example, the uncoated separators used in the original cells have been replaced with coated separators. Since the coating is usually made of powder material, the two layers of coating obtained by the original hot-cutting method cannot be bonded together. The cross-section needs to be encapsulated later, which can easily lead to problems such as low cell quality and low production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cell thermal bonding device and method to improve the problems of low battery cell quality and low production efficiency in the prior art.

[0005] To achieve the above objectives, the present invention provides a battery cell thermal bonding device, comprising a first rotating mechanism, a second rotating mechanism, a transmission mechanism, and a hot-melt device; the first rotating mechanism and the second rotating mechanism are arranged opposite to each other, with opposite rotation directions and a gap between them; the transmission mechanism is disposed on one side of the first rotating mechanism and / or the second rotating mechanism, and is used to drive the battery cell through the gap, with the transmission direction of the transmission mechanism being the same as that of the first rotating mechanism; the hot-melt device is fixedly disposed on the first rotating mechanism and / or the second rotating mechanism, and is used to drive the hot-melt device to rotate, and is used to thermally bond the battery cell during rotation.

[0006] The beneficial effects of the battery cell thermal bonding equipment of the present invention are as follows: By setting the first rotating mechanism and the second rotating mechanism to rotate in opposite directions and with a gap, and setting the conveying direction of the transmission mechanism to be the same as the conveying direction at the gap of the first rotating mechanism, the battery cell can be conveyed in the same direction under the combined action of the first rotating mechanism, the second rotating mechanism and the transmission mechanism when the transmission mechanism conveys the battery cell through the gap. In addition, the hot-melt device is set in the first rotating mechanism and / or the second rotating mechanism, which can heat-melt the separator of the battery cell during the movement of the battery cell, and bond the battery cell under the extrusion action of the hot-melt device. This eliminates the need to stop the conveying of the battery cell during bonding, resulting in high efficiency. Furthermore, the bonding method is carried out by extrusion of the heat capacity module, which does not damage the powder layer of the battery cell and prevents powder loss during subsequent cutting, thus ensuring the quality of the bonded battery cell.

[0007] In one feasible embodiment, the battery cell comprises two separators and several electrodes; the electrodes are sequentially and discontinuously disposed between the two separators, and the hot-melt device is used to thermally bond the two separators at the discontinuities of the electrodes. Its advantages are: by setting the electrodes in a discontinuous form and thermally bonding the separators at the discontinuities, the bonding process is facilitated, and damage to the electrodes is avoided.

[0008] In one feasible embodiment, both the first and second rotating mechanisms include a driving member and a rotating roller. The driving member is connected to the rotating roller and drives the rotating roller to rotate. The hot-melt device is disposed on the rotating roller, and the distance between the end of the hot-melt device near the gap and the rotation axis of the rotating roller is greater than the outer diameter of the rotating roller. Its advantage is that only when the rotation radius of one end of the outer wall of the hot-melt device is set to be greater than the rotation radius of the rotating roller can the hot-melt device compress and bond the separator of the battery cell during rotation.

[0009] In one feasible embodiment, the hot-melt device includes a heating element and a pressing element; the rotating roller has a groove, and the pressing element is slidably and fixably disposed in the groove; the heating element is connected to the pressing element, the heating element is used to heat the pressing element, and the pressing element is used to composite the battery cell. Its beneficial effect is that the heating element generates a hot-melt temperature, the pressing element compresses the separator of the battery cell, and thus, under the combined action of the heating element and the hot-melt element, the battery cell is thermally composited.

[0010] In one feasible solution, an overvoltage protector is also included; one end of the overvoltage protector is slidably and fixably disposed in the groove, and the other end of the overvoltage protector is fixedly disposed on the heat-sealing element. The overvoltage protector is used to provide elastic support for the heat-sealing element. Its beneficial effect is that the overvoltage protector can prevent damage to the battery cell or the heat-sealing device when the pressure is too high.

[0011] In one feasible embodiment, the overpressure protector includes a limiting block and a spring; the limiting block is slidably and fixably disposed in the groove, and the spring is fixedly disposed in the limiting block. Its advantages are: the limiting block fixes the position of the spring, and the movement of the limiting block can indirectly adjust the relative position of the pressing element, allowing adjustment of the spacing during different compounding cycles; and the spring provides elastic support to the pressing element, preventing excessive pressure.

[0012] In one feasible solution, the end of the hot melt component away from the axis of the rotating roller is configured as an arc surface. The advantage of this is that the arc surface elongates the bonding area between the hot melt component and the battery cell during the rotation of the hot melt component, thus improving the bonding effect and facilitating subsequent shearing.

[0013] In one feasible solution, a protective layer is provided at the end of the fusion bonding member away from the axis of the rotating roller. This protective layer is used to prevent the fusion bonding member from adhering to the separator of the battery cell. Its advantages are: by providing the protective layer to prevent the separator from adhering to the fusion bonding member, the quality of the battery cell after lamination is ensured, and the lamination process is guaranteed to proceed normally.

[0014] In one feasible solution, at least two heat-melting devices are provided. The advantage is that by setting different numbers of the heat-capacity modules, the heat-melting devices can be positioned at different locations as needed, while maintaining the rotation radii of the first and second rotating mechanisms, thereby obtaining battery cells of different lengths after composite processing, facilitating use with battery cells of different specifications.

[0015] In one feasible embodiment, each of the hot-melt devices is disposed on either the first rotating mechanism or the second rotating mechanism. The advantages are that by specifying that two or more of the hot-melt devices are disposed on either the first rotating mechanism or the second rotating mechanism, the processing and forming of the first rotating mechanism and the second rotating mechanism are facilitated, as are the placement of the hot-melt devices and the installation of the first rotating mechanism or the second rotating mechanism.

[0016] In one feasible solution, a temperature control device is also included; the temperature control device is electrically connected to the hot-melt device, and is used to control the heating power of the hot-melt device, and also to detect the temperature of the hot-melt device. Its advantages are that: the temperature control device ensures that the lamination process is carried out under controllable temperature conditions, and the lamination temperature can be adjusted according to the detected temperature.

[0017] This invention also provides a method for thermal bonding of battery cells, used to bond battery cells using the thermal bonding equipment described in any of the above feasible solutions, comprising the following steps:

[0018] S1. Place the battery cell in the transmission mechanism and adjust the relative position of the battery cell and the hot-melt device so that the hot-melt device corresponds to the required bonding point of the battery cell;

[0019] S2. Turn on the hot melt device to heat it. Once the hot melt device has been heated to a preset temperature, turn on the first rotating mechanism, the second rotating mechanism, and the transmission mechanism.

[0020] The beneficial effects of the cell thermal bonding method of the present invention are as follows: by adjusting the relative positions of the cell and the hot-melt module, the required thermal bonding point of the cell is ensured to be in accurate contact with the hot-melt device, and then the first rotating mechanism, the second rotating mechanism and the transmission mechanism are activated to carry out the thermal bonding work, resulting in high bonding efficiency and guaranteed quality of the bonded cell.

[0021] In one feasible solution, adjusting the relative position of the battery cell and the hot-melt device specifically includes adjusting the distance between the hot-melt device and the rotation axis of the first rotating mechanism or the second rotating mechanism. Its advantage is that this arrangement allows for precise adjustment of the interval length between the front and rear composite operations, resulting in a battery cell of the desired length.

[0022] In one feasible solution, the step of activating the hot-melt device for heating, and waiting for the hot-melt device to reach a preset temperature, specifically includes: providing a temperature control device, measuring the temperature of the hot-melt device through the temperature control device, comparing the measured temperature with the preset temperature, and then adjusting the heating power of the hot-melt device according to the comparison result, until the measured hot-melt temperature equals the preset temperature. Its beneficial effect is that by adjusting the heating power of the hot-melt module through real-time temperature measurement, the required composite temperature environment is obtained, ensuring the normal progress of the composite process.

[0023] In one feasible solution, before activating the first rotating mechanism, the second rotating mechanism, and the transmission mechanism, the method further includes adjusting the movement speeds of the first rotating mechanism, the second rotating mechanism, and the transmission mechanism to synchronize the movement of the hot-melt device with the battery cell. The beneficial effect is that by setting the movement speeds of the first rotating mechanism, the second rotating mechanism, and the transmission mechanism, the synchronous movement of the hot-melt device with the battery cell is ensured, preventing relative sliding between the hot-melt device and the battery cell and avoiding any impact on the composite position of the battery cell. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the battery cell thermal recombination device in the first embodiment of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the battery cell structure before thermal bonding at point A in the middle;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure during thermal recombination of the battery cell at point B in the middle section;

[0027] Figure 4 for Figure 1 A schematic diagram of the structure of the battery cell after thermal bonding at point C;

[0028] Figure 5 for Figure 1 A schematic diagram of the structure of the first rotating mechanism;

[0029] Figure 6 for Figure 1 Cross-sectional structural schematic diagram of the hot melt device and overvoltage protector;

[0030] Figure 7 This is a schematic diagram of the structure of the first rotating mechanism in the second embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the first rotating mechanism in the third embodiment of the present invention;

[0032] Figure 9 This is a flowchart of the cell thermal bonding method in the fourth embodiment of the present invention.

[0033] Numbering on the map:

[0034] 1. First rotating mechanism; 101. Driving component; 102. Rotating roller;

[0035] 2. Second rotating mechanism;

[0036] 3. Transmission mechanism;

[0037] 4. Hot melt device; 401. Heating element; 402. Press melt element;

[0038] 5. Battery cell; 501. Separator; 502. Electrode;

[0039] 6. Overvoltage protector; 601. Limit block; 602. Spring. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but do not exclude other elements or objects.

[0041] To address the problems existing in the prior art, embodiments of the present invention provide a battery cell thermal recombining device and method.

[0042] Figure 1 This is a schematic diagram of the structure of the battery cell thermal recombination device in the first embodiment of the present invention. Figure 2 for Figure 1 A schematic diagram of the battery cell structure before thermal bonding at point A. Figure 3 for Figure 1 A schematic diagram of the structure during thermal recombination of the battery cell at point B. Figure 4 for Figure 1 A schematic diagram of the structure of the battery cell after thermal bonding at point C.

[0043] In some embodiments of the present invention, reference is made to Figures 1 to 4The battery cell 5 thermal bonding device includes a first rotating mechanism 1, a second rotating mechanism 2, a transmission mechanism 3, and a hot-melt device 4. The first rotating mechanism 1 and the second rotating mechanism 2 are arranged opposite to each other, with opposite rotation directions and a gap between them. The transmission mechanism 3 is located on one side of the first rotating mechanism 1 and / or the second rotating mechanism 2, and is used to drive the battery cell 5 through the gap. The transmission direction of the transmission mechanism 3 is the same as the transmission direction at the gap of the first rotating mechanism 1. The hot-melt device 4 is fixedly arranged on the first rotating mechanism 1 and / or the second rotating mechanism 2, and is used to drive the hot-melt device 4 to rotate. The hot-melt device 4 is used to thermally bond the battery cell 5 during rotation.

[0044] In some specific embodiments of the present invention, the first rotating mechanism 1 and the second rotating mechanism 2 are arranged vertically correspondingly, with the first rotating mechanism 1 positioned on the upper side. The transmission mechanism 3 is horizontally arranged and is a conveyor belt. The top surface of the transmission mechanism 3 is coplanar with the vertex of the second rotating mechanism 2. Two transmission mechanisms 3 are provided, symmetrically arranged on both sides of the gap. The battery cell 5 is placed on the left-hand transmission mechanism 3, which transports the battery cell 5 from left to right. The first rotating mechanism 1 rotates counterclockwise, and the second rotating mechanism 2 rotates clockwise.

[0045] The hot-melt device 4 is mounted on the first rotating mechanism 1. The rotation radius of the hot-melt device 4 is greater than that of the first rotating mechanism 1, and the rotation radius of the hot-melt device 4 is not greater than the sum of the rotation radius of the first rotating mechanism 1 and the length of the gap. In use, as the hot-melt device 4 rotates with the first rotating mechanism 1, it can compress the battery cell 5 at the gap. The compression and heat generated by the hot-melt device 4 can thermally bond the battery cell 5. This allows for thermal bonding of the battery cell 5 during the rotation of the hot-melt device 4, resulting in high bonding efficiency. Furthermore, the diaphragm 501 of the battery cell 5 is bonded during rotation, and then cut by the cutting mechanism, preventing powder loss and ensuring the quality of the bonded battery cell 5.

[0046] In some embodiments, the hot-melt device 4 is disposed on the second rotating mechanism 2.

[0047] In some other embodiments, the thickness of the battery cell 5 is generally 2-5 mm, the length of the gap is set to 2.1-5.5 mm, and the length of the gap is slightly greater than the thickness of the battery cell 5. It is worth noting that when the hot-melt device 4 is located on the first rotating mechanism 1, the hot-melt point of the battery cell 5 is close to the second rotating mechanism 2; when the hot-melt device 4 is located on the second rotating mechanism 2, the hot-melt point of the battery cell 5 is close to the first rotating mechanism 1; when both the first rotating mechanism 1 and the second rotating mechanism 2 are equipped with the hot-melt device 4, and the hot-melt devices 4 on both are arranged opposite each other, the hot-melt point of the battery cell 5 is located near the middle of the gap.

[0048] In some embodiments, the transmission mechanism 3 delivers the battery cell 5 from right to left, in which case the first rotating mechanism 1 rotates clockwise and the second rotating mechanism 2 rotates counterclockwise.

[0049] In some other embodiments, the transmission direction of the transmission mechanism 3 forms a certain angle with the horizontal plane. In some other specific embodiments, the axis connecting the first rotating mechanism 1 and the second rotating mechanism 2 is perpendicular to the transmission direction of the transmission mechanism 3.

[0050] In some other embodiments, the transmission mechanisms 3 located on both sides of the second rotating mechanism 2 are at an angle to the horizontal plane, and the transmission mechanisms 3 on both sides are symmetrically arranged.

[0051] In some embodiments of the present invention, reference is made to Figures 1 to 4 The battery cell 5 is provided with two layers of separators 501 and several electrodes 502; the several electrodes 502 are arranged discontinuously between the two layers of separators 501, and the hot-melt device 4 is used to thermally bond the two layers of separators 501 at the discontinuities of the several electrodes 502.

[0052] In some specific embodiments of the present invention, the diaphragm 501 is continuously arranged, two layers of the diaphragm 501 are arranged vertically, and both layers of the diaphragm 501 extend horizontally. Each electrode 502 is arranged sequentially from left to right between the two diaphragms 501. As the conveying mechanism 3 transports the material, and the first rotating mechanism 1 and the second rotating mechanism 2 rotate, the hot-melt device 4 squeezes the two layers of diaphragm 501 at the discontinuity or the interval, and thermally bonds the two layers of diaphragm 501 together.

[0053] In some embodiments, the electrode 502 is a positive electrode 502 or a negative electrode 502.

[0054] In some embodiments, the length of the movement path of the hot-melt device 4 to the gap in two consecutive movements is the length of the electrode 502. Therefore, the electrode 502 can be set at different intervals according to the number of hot-melt devices 4 uniformly arranged on the first rotating mechanism 1 and the second rotating mechanism 2, or the interval between different hot-melt devices 4, and the rotation radius of the first rotating mechanism 1 or the second rotating mechanism 2.

[0055] In some other embodiments, the battery cell 5 is provided with three layers of separators 501, with a discontinuous electrode 502 between the upper separator 501 and the middle separator 501, and a discontinuous electrode 502 between the lower separator 501 and the middle separator 501, and the upper and lower electrode 502 are arranged correspondingly.

[0056] In some other embodiments, the separator 501 of the battery cell 5 and the electrode 502 undergo a pre-composite treatment, that is, the separator 501 and the side of the electrode 502 are combined together. The position of the combination by the hot-melt device 4 is still at the discontinuity of the electrode 502 of the battery cell 5. Furthermore, at this time, the length of the separator 501 at the discontinuity is the distance between two adjacent electrode 502s. During the combination, the extensibility of the separator 501 is used to squeeze and stretch the upper separator 501 to fit with the lower separator 501, thereby thermally combining the upper and lower separator 501 layers.

[0057] Figure 5 for Figure 1 A schematic diagram of the first rotating mechanism.

[0058] In some embodiments of the present invention, reference is made to Figures 1 to 5 Both the first rotating mechanism 1 and the second rotating mechanism 2 include a driving member 101 and a rotating roller 102; the driving member 101 is connected to the rotating roller 102, and the driving member 101 is used to drive the rotating roller 102 to rotate; the hot melt device 4 is disposed on the rotating roller 102, and the distance between the end of the hot melt device 4 near the gap and the rotation axis of the rotating roller 102 is greater than the outer diameter of the rotating roller 102.

[0059] In some specific embodiments of the present invention, the driving component 101 is a motor, and the movement path of each point on the rotating roller 102 is circular when it rotates. Therefore, the cross-section of the rotating roller can be circular, regular polygonal, or irregular. A gap is left between the first rotating mechanism 1 and the second rotating mechanism 2, that is, the sum of the maximum rotation radii of the rotating roller 102 of the first rotating mechanism 1 and the rotating roller 102 of the second rotating mechanism 2 is less than the distance between the axes of the two rotating mechanisms.

[0060] In some embodiments, the hot-melt device 4 is disposed on the first rotating mechanism 1, and the radius of rotation of the end of the hot-melt device 4 away from the axis of the rotating roller 102 of the first rotating mechanism 1 is greater than the radius of rotation of the outermost point of the rotating roller 102 of the first rotating mechanism 1. In this way, the outer end of the hot-melt device 4 can be used to press the battery cell 5 through the gap, i.e., the hot-melt bonding.

[0061] Figure 6 for Figure 1 A cross-sectional schematic diagram of the hot melt device and overvoltage protector.

[0062] In some embodiments of the present invention, reference is made to Figures 1 to 6 The hot-melting device 4 includes a heating element 401 and a pressing element 402; the rotating roller 102 is provided with a groove, the pressing element 402 is slidably and fixably disposed in the groove, the heating element 401 is connected to the pressing element 402, the heating element 401 is used to heat the pressing element 402, and the pressing element 402 is used to composite the battery cell 5.

[0063] In some specific embodiments of the present invention, the heating element 401 is a heating wire, the pressing element 402 is made of a rigid material, the heating wire is disposed on the side of the pressing element 402 near the axis, or the heating wire is disposed inside the pressing element 402.

[0064] In some embodiments, the extending direction of the groove is collinear with the rotation axis of the first rotating mechanism 1.

[0065] In some embodiments of the present invention, reference is made to Figures 1 to 6 It also includes an overvoltage protector 6; one end of the overvoltage protector 6 is slidably and can be fixedly disposed in the groove, and the other end of the overvoltage protector 6 is fixedly disposed with the pressure fusion piece 402. The overvoltage protector 6 is used to provide elastic support force for the pressure fusion piece 402.

[0066] In some specific embodiments of the present invention, the overpressure protector 6 is slidably and fixably disposed in the groove at one end near the axis of the rotating roller 102, and the pressure fusion member 402 is fixedly disposed at the other end of the overpressure protector 6 away from the rotating roller 102. The overpressure protector 6 provides elastic support to the pressure fusion member 402, and when the pressure fusion member 402 is subjected to a force greater than the elastic support force, the pressure fusion member 402 can retract into the groove.

[0067] In some embodiments of the present invention, reference is made to Figures 1 to 6The overvoltage protector 6 includes a limiting block 601 and a spring 602; the limiting block 601 is slidably and fixably disposed in the groove, and the spring 602 is fixedly disposed in the limiting block 601.

[0068] In some specific embodiments of the present invention, the rotating roller 102 is provided with a threaded hole, the threaded hole is connected to the groove, the limiting block 601 is slidably disposed in the groove, a bolt is provided in the threaded hole, and one end of the bolt near the groove abuts against the side of the limiting block 601, thereby realizing the sliding fixation of the limiting block 601, and the spring 602 is fixed on the side of the limiting block 601 away from the axis of the rotating roller 102.

[0069] In some embodiments, the two rotating rollers 102 of the first rotating mechanism 1 and the second rotating mechanism 2 are connected by chains and gears, so that only one motor is needed for driving.

[0070] In some embodiments, the length of the gap between the first rotating mechanism 1 and the second rotating mechanism 2 is adjustable, and the position of the heat capacity module is adjustable, so that thermal bonding can be performed after the length of the gap is adjusted.

[0071] In some other embodiments, the rotating roller 102 is replaceable. In some specific embodiments, the smaller diameter rotating roller 102 is replaced with a larger diameter rotating roller 102.

[0072] In some embodiments of the present invention, reference is made to Figures 1 to 6 The end of the pressing and melting element 402 away from the axis of the rotating roller 102 is set as an arc surface.

[0073] In some embodiments of the present invention, reference is made to Figures 1 to 6 The end of the fused piece 402 away from the axis of the rotating roller 102 is provided with a protective layer (not shown in the figure), which is used to prevent the fused piece 402 from sticking to the diaphragm 501 of the battery cell 5.

[0074] In some specific embodiments of the present invention, the protective layer (not shown in the figure) is a Teflon adhesive tape layer.

[0075] Figure 7 This is a schematic diagram of the structure of the first rotating mechanism in the second embodiment of the present invention. Figure 8 This is a schematic diagram of the structure of the first rotating mechanism in the third embodiment of the present invention.

[0076] In some embodiments of the present invention, reference is made to Figures 1 to 8 The hot-melting device 4 is configured to be at least two.

[0077] In some specific embodiments of the present invention, the hot-melt device 4 is configured as three, and the three hot-melt devices 4 are evenly arranged on the first rotating mechanism 1.

[0078] In some embodiments, the hot-melting device 4 is provided in two, four, five or other quantities.

[0079] In some embodiments, each of the hot-melt devices 4 is arranged on the rotating roller 102 with different central angles. It is worth noting that when two or more of the hot-melt devices 4 are arranged on the rotating roller 102 with different central angles, the lengths of the resulting composite cells 5 are also not equal.

[0080] In some embodiments of the present invention, reference is made to Figures 1 to 8 Each of the hot-melting devices 4 is disposed on the first rotating mechanism 1 or the second rotating mechanism 2.

[0081] In some embodiments of the present invention, reference is made to Figures 1 to 8 It also includes a temperature control device (not shown in the figure); the temperature control device is electrically connected to the hot melt device 4, the temperature control device is used to control the heating power of the hot melt device 4, and the temperature control device is also used to detect the temperature of the hot melt device 4.

[0082] In some specific embodiments of the present invention, the temperature control device (not shown in the figure) includes a temperature sensor and a controller. The temperature sensor is disposed on the press-fit element 402 and is used to detect the temperature of the press-fit element 402. The controller is electrically connected to the temperature sensor and electrically connected to the heating element 401. The controller is used to compare the temperature measured by the temperature sensor with a preset temperature and control the heating power of the heating element 401 according to the comparison result.

[0083] In some embodiments, the controller controls the heating power of the heating element 401 by adjusting the operating voltage. In other embodiments, the heating element 401 is provided with multiple heating wires, and the controller controls the opening and closing of different numbers of heating wires to adjust the heating power of the heating element 401.

[0084] Figure 9 This is a flowchart of the cell thermal bonding method in the fourth embodiment of the present invention.

[0085] In some embodiments of the present invention, reference is made to Figures 1 to 9 The cell 5 thermal bonding method is used to bond cell 5 using the cell 5 bonding equipment described in any of the above embodiments, and includes the following steps:

[0086] S1. Place the battery cell 5 in the transmission mechanism 3, and adjust the relative position of the battery cell 5 and the hot-melt device 4 so that the hot-melt device 4 corresponds to the required composite part of the battery cell 5;

[0087] S2. Turn on the hot melt device 4 to heat it. Once the hot melt device 4 has been heated to a preset temperature, turn on the first rotating mechanism 1, the second rotating mechanism 2 and the transmission mechanism 3.

[0088] In some specific embodiments of the present invention, the battery cell 5 to be composited is placed on the upper side of the transmission mechanism 3, and the relative position of the battery cell 5 or the first rotating mechanism 1 is adjusted so that when the hot-melt device 4 rotates to the gap between the first rotating mechanism 1 and the second rotating mechanism 2, the hot-melt device 4 abuts against the required composite position of the battery cell 5. After the adjustment is complete, the hot-melt device 4 is turned on to heat the hot-melt device 4 to a preset temperature. Then, the rotating mechanism, the second rotating mechanism 2 and the transmission mechanism 3 are turned on to composite the battery cell 5. Finally, the rotating mechanism, the second rotating mechanism 2 and the transmission mechanism 3 are turned off.

[0089] In some embodiments of the present invention, adjusting the relative position of the battery cell 5 and the hot-melt device 4 specifically includes adjusting the distance of the hot-melt device 4 relative to the rotation axis of the first rotating mechanism 1 or the second rotating mechanism 2.

[0090] In some specific embodiments of the present invention, the hot-melt device 4 is disposed on the first rotating mechanism 1. Adjusting the position of the hot-melt device 4 relative to the first rotating mechanism 1 can adjust the spacing between the two composite operations, so that it is adapted to the length of the electrode 502 of the battery cell 5.

[0091] In some embodiments of the present invention, the step of turning on the hot melt device 4 for heating until the hot melt device 4 is heated to a preset temperature specifically includes: providing a temperature control device, measuring the temperature of the hot melt device 4 through the temperature control device, comparing the measured temperature with the preset temperature, and then adjusting the heating power of the hot melt device 4 according to the comparison result through the temperature control device until the measured hot melt temperature is equal to the preset temperature.

[0092] In some embodiments of the present invention, before activating the first rotating mechanism 1, the second rotating mechanism 2 and the transmission mechanism 3, the method further includes: adjusting the movement speed of the first rotating mechanism 1, the second rotating mechanism 2 and the transmission mechanism 3 so that the hot-melt device 4 moves synchronously with the battery cell 5.

[0093] In some specific embodiments of the present invention, the hot-melt device 4 and the battery cell 5 are set to move synchronously. That is, the linear velocity of the hot-melt device 4 on the first rotating mechanism 1 is set to be equal to the phase velocity of the transmission mechanism 3. This can prevent relative sliding between the hot-melt device 4 and the battery cell 5 and prevent the battery cell 5 from being misaligned.

[0094] While embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of the invention as set forth in the claims. Furthermore, the invention described herein may have other embodiments and can be implemented or carried out in various ways.

Claims

1. A battery cell thermal bonding device, characterized in that, It includes a first rotating mechanism, a second rotating mechanism, a transmission mechanism, an overvoltage protector, and a hot-melt device; The first rotating mechanism and the second rotating mechanism are arranged opposite to each other, and the first rotating mechanism and the second rotating mechanism have a gap. The transmission mechanism is arranged on one side of the first rotating mechanism and / or the second rotating mechanism. The transmission mechanism is used to drive the battery cell through the gap. The transmission direction of the transmission mechanism is the same as the transmission direction at the gap of the first rotating mechanism. The hot-melt device is fixedly mounted on the first rotating mechanism and / or the second rotating mechanism. The first rotating mechanism and / or the second rotating mechanism are used to drive the hot-melt device to rotate. The hot-melt device is used to thermally bond the battery cell when rotating. Both the first rotating mechanism and the second rotating mechanism include a driving member and a rotating roller; the driving member is connected to the rotating roller and is used to drive the rotating roller to rotate; the hot-melt device is disposed on the rotating roller, and the distance between the end of the hot-melt device near the gap and the rotation axis of the rotating roller is greater than the outer diameter of the rotating roller; the two rotating rollers of the first rotating mechanism and the second rotating mechanism are connected by a chain and a gear. The hot-melting device includes a heating element and a pressing element; the rotating roller is provided with a groove, the pressing element is slidably and fixably disposed in the groove, the heating element is connected to the pressing element, the heating element is used to heat the pressing element, and the pressing element is used to composite the battery cell; One end of the overvoltage protector is slidably and can be fixedly disposed in the groove, and the other end of the overvoltage protector is fixedly disposed with the fusion piece. The overvoltage protector is used to provide elastic support force for the fusion piece.

2. The battery cell thermal recombination device according to claim 1, characterized in that, The battery cell has two layers of separators and several electrodes; The plurality of electrode sheets are sequentially and discontinuously disposed between the two layers of the separator, and the hot-melt device is used to thermally bond the two layers of the separator at the discontinuity of the plurality of electrode sheets.

3. The battery cell thermal recombination device according to claim 1, characterized in that, The overvoltage protector includes a limit block and a spring; The limiting block is slidably and fixably disposed in the groove, and the spring is fixedly disposed in the limiting block.

4. The battery cell thermal recombination device according to claim 1, characterized in that, The end of the press-molded part away from the axis of the rotating roller is set as an arc surface.

5. The battery cell thermal recombination device according to claim 1, characterized in that, The end of the fused component away from the axis of the rotating roller is provided with a protective layer, which is used to prevent the fused component from sticking to the separator of the battery cell.

6. The battery cell thermal recombination device according to claim 1, characterized in that, The hot-melting device is configured to have at least two units.

7. The battery cell thermal recombination device according to claim 6, characterized in that, Each of the aforementioned hot-melting devices is disposed on the first rotating mechanism or the second rotating mechanism.

8. The battery cell thermal recombination device according to claim 1, characterized in that, It also includes a temperature control device; The temperature control device is electrically connected to the hot melt device. The temperature control device is used to control the heating power of the hot melt device and is also used to detect the temperature of the hot melt device.

9. A method for thermal bonding of battery cells, characterized in that, A method for bonding battery cells using the battery cell thermal bonding equipment according to any one of claims 1 to 8 includes the following steps: S1. Place the battery cell in the transmission mechanism and adjust the relative position of the battery cell and the hot-melt device so that the hot-melt device corresponds to the required bonding point of the battery cell; S2. Turn on the hot melt device to heat it. Once the hot melt device has been heated to a preset temperature, turn on the first rotating mechanism, the second rotating mechanism, and the transmission mechanism.

10. The cell thermal bonding method according to claim 9, characterized in that, The adjustment of the relative position between the battery cell and the hot-melt device specifically includes: adjusting the distance between the hot-melt device and the rotation axis of the first rotating mechanism or the second rotating mechanism.

11. The cell thermal bonding method according to claim 9, characterized in that, The step of activating the hot-melt device for heating, and waiting for the hot-melt device to reach a preset temperature, specifically includes: A temperature control device is provided to measure the temperature of the hot melt device, compare the measured temperature with a preset temperature, and then adjust the heating power of the hot melt device according to the comparison result until the measured hot melt temperature is equal to the preset temperature.

12. The cell thermal bonding method according to claim 9, characterized in that, Before activating the first rotating mechanism, the second rotating mechanism, and the transmission mechanism, the method further includes: Adjust the movement speed of the first rotating mechanism, the second rotating mechanism, and the transmission mechanism to make the hot-melt device move synchronously with the battery cell.

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