Battery cell tab pre-pressing device and pre-pressing equipment

Abstract

The invention relates to the technical field of battery processing, and discloses a battery cell tab pre-pressing device and pre-pressing equipment. The battery cell tab pre-pressing device comprises a mounting disc and a pre-pressing mechanism, the pre-pressing mechanism comprises a plurality of pre-pressing pieces which are radially distributed by taking the circle center of the mounting disc as the center, each pre-pressing piece comprises a first end and a second end, the first end is provided with a pre-pressing surface, and the pre-pressing surface is also provided with a push broach rib which extends along the radial direction of the mounting disc; each pre-pressing piece is rotationally arranged on the mounting disc so as to be switched between a first position and a second position; and in the process that the pre-pressing piece is switched from the first position to the second position, pre-pressing operation on the tab of the battery cell to be pressed is achieved, and a pressing groove of the tab of the battery cell is formed in the position, corresponding to the convex edge of the push broach, of the end face of the battery cell to be pressed. The battery cell tab pre-pressing device can be used for forming tabs with good compactness and high flatness on the end surface of a battery cell, so that the quality of a finished battery cell is ensured.

Description

Technical Field

[0001] This invention relates to the field of battery processing technology, and in particular to a cell tab pre-pressing device and pre-pressing equipment. Background Technology

[0002] The new energy industry has attracted much attention. Within this industry, battery technology is a crucial factor in its development. Lithium-ion power batteries are widely used due to their advantages such as high energy density, good safety, light weight, and long cycle life.

[0003] In the manufacturing process of all-tab batteries, pressure is typically applied to the cell tabs to achieve a certain flatness and compaction density, a process known as flattening. Flattening helps ensure a tight bond between the layers of electrode sheets in the battery tab area, reducing gaps. Existing flattening mechanisms usually include a drive module and a pressure plate connected to the output of the drive module. The drive module moves the pressure plate closer to the cell to apply pressure to the cell tabs. However, this flattening operation easily causes excess tabs to protrude beyond the edge of the cell end face, resulting in out-of-tolerance cell diameter, defective products, and significantly increased cell production costs.

[0004] Therefore, there is an urgent need to propose a cell tab pre-pressure device and pre-pressure equipment to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-pressing device and equipment for battery cell tabs, which can form tabs with good density and high flatness, ensuring the quality of finished battery cells and reducing production costs.

[0006] Based on the above concept, the technical solution adopted by this invention is as follows:

[0007] A battery cell tab pre-loading device, comprising:

[0008] Installation disk;

[0009] The pre-compression mechanism includes multiple pre-compression components radially distributed on the mounting plate with the center of the mounting plate as the center. Each pre-compression component includes a first end near the center of the mounting plate and a second end away from the center of the mounting plate. The first end is provided with a pre-compression surface, and the pre-compression surface is also provided with a pusher protrusion extending radially along the mounting plate. The middle part of each pre-compression component is rotatably disposed on the mounting plate to switch between a first position and a second position.

[0010] When the pre-pressing member is in the first position, the second end tilts away from the mounting plate. When the pre-pressing member is in the second position, the pre-pressing member is parallel to the mounting plate. During the process of the pre-pressing member switching from the first position to the second position, the pre-pressing operation of the tab of the cell to be pressed is realized, and a pressure groove for the tab of the cell is formed on the end face of the cell to be pressed, corresponding to the position of the pusher ridge.

[0011] As a preferred embodiment of the pre-compression device for battery cell tabs provided by the present invention, the pre-compression component is rotatably mounted on the mounting plate via a rotating shaft, and the axis of the rotating shaft is coplanar with the pre-compression surface.

[0012] As a preferred embodiment of the pre-compression device for battery cell tabs provided by the present invention, the distance L between the end of the first end of the pre-compression member and the axis of the rotating shaft along the radial direction of the mounting plate is D / 2 + ΔL.

[0013] Where D is the diameter of the end face of the cell to be pressurized 100, and ΔL is 2.0mm~3.5mm.

[0014] As a preferred embodiment of the pre-pressurization device for battery cell tabs provided by the present invention, the pre-pressurization device for battery cell tabs further includes a driving mechanism, which is configured to drive multiple pre-pressurization components to switch simultaneously from the first position to the second position.

[0015] As a preferred embodiment of the pre-pressing device for battery cell tabs provided by the present invention, the pre-pressing device for battery cell tabs further includes a fixing frame, the mounting plate is disposed on the fixing frame, and the driving mechanism includes a pushing member, which is slidably disposed on the fixing frame and can pass through the center of the mounting plate and abut against the first end of all the pre-pressing members.

[0016] As a preferred embodiment of the pre-loading device for battery cell tabs provided by the present invention, the driving mechanism further includes a driving arm, the middle part of which is rotatably connected to the fixed frame, one end of which is connected to the pusher, and the other end of which forms a handheld end. Rotating the driving arm can drive the pusher to move along the axial direction of the mounting plate.

[0017] As a preferred embodiment of the pre-pressure device for battery cell tabs provided by the present invention, the pre-pressure mechanism further includes a reset member, the two ends of which are respectively connected to the mounting plate and the second end.

[0018] As a preferred embodiment of the pre-compression device for battery cell tabs provided by the present invention, the mounting plate is provided with receiving grooves corresponding to the positions of the reset members. When the pre-compression member is in the second position, the reset member can be received in the receiving grooves in a compressed state.

[0019] As a preferred embodiment of the pre-pressing device for battery cell tabs provided by the present invention, a limiting part is further provided on the mounting plate corresponding to the position of the pre-pressing member. When the pre-pressing member is in the second position, the second end abuts against the limiting part.

[0020] As a preferred embodiment of the pre-pressurization device for battery cell tabs provided by the present invention, the pre-pressurization device for battery cell tabs further includes a center pin, which is disposed at the center of the mounting plate and can extend into the center hole of the battery cell to be pressurized.

[0021] As a preferred embodiment of the pre-loading device for battery cell tabs provided by the present invention, the height of the pusher ridge gradually decreases towards the center of the mounting plate.

[0022] As a preferred embodiment of the pre-loading device for the battery cell tabs provided by the present invention, the height of the end of the pusher ridge near the center of the mounting plate is 0.3mm to 0.6mm; and / or

[0023] The height of the end of the pusher ridge furthest from the center of the mounting plate is 0.7mm to 1.2mm; and / or

[0024] The width of the pusher protrusion is 0.2mm to 1.5mm.

[0025] To achieve the above objectives, the present invention also provides a pre-compression device, comprising:

[0026] frame;

[0027] A clamping device is provided on the frame, and the clamping device is used to install the battery cell to be pressed;

[0028] The cell tab pre-loading device described above;

[0029] The feeding device includes a drive module and an operating platform. The cell tab pre-pressing device is mounted on the operating platform. The drive module is set on the frame, and the output end of the drive module is connected to the operating platform so as to drive the cell tab pre-pressing device to move in the horizontal and / or vertical direction through the operating platform, thereby approaching the cell to be pre-pressed for pre-pressing.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention provides a pre-loading device for battery cell tabs. By rotating a pre-loading component onto a mounting plate, the pre-loading component can perform pre-loading operations on the battery cell to be loaded during the process of switching from a first position to a second position. When switching from the first position to the second position, the end of the pre-loading surface furthest from the center of the mounting plate first contacts the end face of the battery cell to be loaded. This allows the pre-loading component to perform pre-loading operations from the outside in on the end face of the battery cell, preventing excess tabs from protruding from the edge of the end face of the battery cell during the pre-loading process. This ensures the quality of the finished battery cell, improves the yield rate, and avoids increased processing costs due to excessive scrap. By setting pusher protrusions on the pre-pressing surface of the pre-pressing component, corresponding pressure grooves can be formed on the end face of the cell to be pressed, so as to accommodate the tabs that are stacked together during the pre-pressing process. This avoids the excess tabs being squeezed between two adjacent pre-pressing components during the pre-pressing process, forming an uncontrollable deformation bulge. This ensures that dense and flat tabs can be formed on the end face of the cell to be pressed. Furthermore, by forming pressure grooves on the end face of the cell to be pressed, excess tabs can also be accommodated in the subsequent flattening operation, so as to ensure that the finished cell has tabs with good density and high flatness, meet the process dimensional forming requirements of the cell to be pressed, and ensure the quality of the finished cell.

[0032] The present invention also provides a pre-pressing device. By applying the above-mentioned cell tab pre-pressing device, a tab with better density and flatness can be formed on the end face of the cell, thereby meeting the process size forming requirements of the cell and ensuring the quality of the finished cell. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the battery cell tab pre-loading device provided in an embodiment of the present invention from one perspective;

[0034] Figure 2 This is a schematic diagram of the structure of the pre-compression component provided in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the battery cell to be pre-pressed according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the battery cell after pre-pressurization according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of the pre-compression device for battery cell tabs provided in an embodiment of the present invention when multiple pre-compression components are in the first position;

[0038] Figure 6 This is a schematic diagram of the structure of the pre-compression device for battery cell tabs provided in an embodiment of the present invention when multiple pre-compression components are in the second position;

[0039] Figure 7This is a schematic diagram of the battery cell tab pre-compression device provided in an embodiment of the present invention from another perspective;

[0040] Figure 8 yes Figure 7 A cross-sectional view;

[0041] Figure 9 This is a schematic diagram of the battery cell tab pre-pressure device provided in an embodiment of the present invention from another perspective;

[0042] Figure 10 yes Figure 9 A cross-sectional view;

[0043] Figure 11 This is a schematic diagram of the pre-compression device provided in an embodiment of the present invention.

[0044] In the picture:

[0045] 100. Battery cell to be pressed; 101. Pressing groove; 102. Center hole;

[0046] 200. Cell tab pre-compression device; 300. Clamping device; 400. Feeding device; 410. Drive module; 420. Operating platform; 500. Frame;

[0047] 1. Fixture;

[0048] 2. Pre-compression mechanism; 21. Pre-compression component; 2101. First end; 2102. Second end; 211. Pre-compression surface; 212. Pusher protrusion; 213. Second mounting hole; 22. Rotary shaft; 23. Reset component; 24. Mounting bracket;

[0049] 3. Mounting plate; 31. Receiving groove; 32. Limiting part;

[0050] 4. Drive mechanism; 41. Pushing component; 411. Abutting plane; 42. Drive arm; 43. First mounting shaft; 44. Second mounting shaft;

[0051] 5. Center needle. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0053] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0056] Figure 1 A schematic diagram of the battery cell tab pre-pressure device 200 provided in this embodiment is shown from one perspective. Figure 2 A schematic diagram of the pre-compression component 21 provided in this embodiment is shown. Figure 3 This diagram shows the structure of the battery cell 100 to be pre-pressed as provided in this embodiment. Figure 4 A schematic diagram of the structure of the battery cell 100 provided in this embodiment after pre-pressurization is shown. Figures 1-4As shown, this embodiment provides a battery cell tab pre-compression device 200, which includes a pre-compression mechanism 2 and a mounting plate 3. The pre-compression mechanism 2 includes a plurality of pre-compression components 21 radially distributed on the mounting plate 3 with the center of the plate as the center. Each pre-compression component 21 includes a first end 2101 near the center of the mounting plate 3 and a second end 2102 away from the center of the mounting plate 3. The first end 2101 is provided with a pre-compression surface 211, and the pre-compression surface 211 is also provided with a pusher protrusion 212 extending radially along the mounting plate 3. The middle part of each pre-pressing component 21 is rotatably mounted on the mounting plate 3 to switch between a first position and a second position. When the pre-pressing component 21 is in the first position, the second end 2102 is tilted away from the mounting plate 3. When the pre-pressing component 21 is in the second position, the pre-pressing component 21 is parallel to the mounting plate 3. During the process of the pre-pressing component 21 switching from the first position to the second position, the pre-pressing operation of the tab of the cell to be pressed 100 is realized, and the pressure groove 101 of the cell tab is formed on the end face of the cell to be pressed corresponding to the position of the pusher protrusion 212.

[0057] The battery cell tab pre-compression device 200 provided in this embodiment, by rotating the pre-compression component 21 onto the mounting plate 3, can perform pre-compression operation on the battery cell 100 to be compressed during the process of switching the pre-compression component 21 from the first position to the second position. When the pre-compression component 21 switches from the first position to the second position, the end of the pre-compression surface 211 furthest from the center of the mounting plate 3 first contacts the end face of the battery cell 100 to be compressed. This allows the pre-compression component 21 to perform pre-compression operation on the end face of the battery cell 100 from the outside in, preventing excess tabs from protruding from the edge of the end face of the battery cell 100 during the pre-compression process. This ensures the quality of the finished battery cell, improves the yield rate of the battery cell, and avoids increased processing costs due to excessive scrap. By setting pusher protrusions 212 on the pre-pressing surface 211 of the pre-pressing component 21, a corresponding pressure groove 101 can be formed on the end face of the battery cell 100 to be pressed, so as to accommodate the electrode tabs that are stacked together during the pre-pressing process, and to prevent the excess electrode tabs from being squeezed between two adjacent pre-pressing components 21 to form an uncontrollable deformation protrusion during the pre-pressing process. This ensures that a dense and flat electrode tab can be formed on the end face of the battery cell 100 to be pressed. Furthermore, by forming pressure grooves 101 on the end face of the battery cell 100 to be pressed, excess electrode tabs can also be accommodated in the subsequent flattening operation, so as to ensure that the finished battery cell has electrode tabs with good density and high flatness, meet the process size forming requirements of the battery cell 100 to be pressed, and ensure the quality of the finished battery cell.

[0058] Figure 5 This diagram shows a structural schematic of the battery cell tab pre-compression device 200 provided in this embodiment when the plurality of pre-compression components 21 are in the first position. Figure 6 This diagram illustrates the structure of the battery cell tab pre-compression device 200 provided in this embodiment when multiple pre-compression components 21 are in the second position. (See diagram for example.) Figures 5-6and combined Figures 2-4 As shown, when multiple preloaded components 21 are in the first position (i.e., as shown) Figure 5 When the second end 2102 of the pre-compression member 21 is tilted away from the mounting plate 3, the cell to be compressed 100 is brought close to the cell tab pre-compression device 200, and then the multiple pre-compression members 21 are switched to the second position (i.e., as shown). Figure 6 The pre-pressing component 21 shown is parallel to the mounting plate 3. During this process, the pre-pressing operation of the cell to be pressed 100 from the outside to the inside can be realized. The electrode tabs can be pressed well, so that multiple fan-shaped areas are formed on the end face of the cell to be pressed 100. During the pre-pressing process, the dense area and the pressing groove 101 are formed simultaneously.

[0059] Optionally, the overall height of the pusher ridge 212 is in the range of 0.3mm to 1.2mm; the width of the pusher ridge 212 is in the range of 0.2mm to 1.5mm. The pusher ridge 212 within this height and width range can form a pressure groove 101 with better depth and width on the end face of the cell to be pressured 100, so that the pressure groove 101 has enough space to accommodate the tabs that are stacked together during the pre-pressure process, and avoids excess tabs forming protrusions between two adjacent pre-pressure members 21, thereby further ensuring the compactness and flatness of the tabs. For example, in actual processing, the height of the pusher protrusion 212 can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, etc., and the width of the pusher protrusion 212 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, etc. Of course, this embodiment does not limit the specific height and width of the pusher protrusion 212; designers can adjust the height and width of the pusher protrusion 212 according to the specific dimensions and forming requirements of the battery cell 100 to be pressed. In this embodiment, the battery cell 100 to be pressed has a wound core structure. When the pre-pressing member 21 presses the battery cell 100 to be pressed, it presses from the outside to the inside. That is, the outer tabs will collapse towards the center hole 102 of the battery cell 100 to be pressed. However, due to the center pin 5 inside the center hole 102 (reference... Figure 8 Due to limitations (described in detail later), the tabs located near the central hole 102 cannot collapse into the central hole 102, resulting in a greater degree of tab accumulation closer to the central hole 102. To form the corresponding pressure groove 101 and ensure that the tabs on the entire end face of the cell to be pressed have sufficient space to be compressed, the height of the pusher ridge 212 gradually decreases towards the center of the mounting plate 3. Optionally, the height difference between the two ends of the pusher ridge 212 along the radial direction of the mounting plate 3 is 0.1mm to 1mm. It should be explained that... Figure 2For illustrative purposes only, in actual processing, there is a height difference between the two ends of the pusher ridge 212 along the radial direction of the mounting plate 3. By setting the pusher ridge 212 with a height difference between the two ends along the radial direction of the mounting plate 3, a pressure groove 101 with a deep outer circumference and a shallow inner circle can be formed on the end face of the cell to be pressed 100, so that there is enough space in the pressure groove 101 to accommodate the tabs that are squeezed against each other during pre-pressing and subsequent flattening operations.

[0060] Furthermore, the height of the end of the pusher ridge 212 closest to the center of the mounting plate 3 is 0.3mm to 0.6mm; the height of the end of the pusher ridge 212 furthest from the center of the mounting plate 3 is 0.7mm to 1.2mm. In this embodiment, the height of the end of the pusher ridge 212 closest to the center of the mounting plate 3 is preferably 0.5mm, and the height of the end of the pusher ridge 212 furthest from the center of the mounting plate 3 is preferably 0.8mm. Of course, this embodiment does not limit the specific height of the pusher ridge 212 at both ends along the radial direction of the mounting plate 3, and the designer can adjust the above values ​​according to the specific dimensions and molding requirements of the battery cell 100 to be pressed.

[0061] like Figure 1 , Figure 2 and Figure 6 As shown, in this embodiment, there are eight pre-pressing components 21. These eight components are evenly spaced along the circumference of the mounting plate 3. The pre-pressing surface 211 of each component is approximately a fan-shaped area with a central angle of 45°. This allows the pre-pressing surfaces 211 of all eight components to close together when all components are switched to the second position, forming a circular surface that matches the end face of the battery cell 100 to be pressurized. This achieves the pre-pressing operation on the end face of the battery cell 100. Furthermore, the structure of the pre-pressing components 21 is simple and easy to manufacture. Of course, in other embodiments, the number of pre-pressing components 21 can be any number, such as four, six, or ten. The central angle of the pre-pressing surface 211 of each component can also be adjusted according to the number of components to ensure that multiple pre-pressing components 21 can close together to form a circular surface that matches the end face of the battery cell 100 to be pressurized.

[0062] It should be noted that the specific location of the pusher protrusion 212 on the pre-pressing surface 211 is not limited in this embodiment. It can be located in the middle of the pre-pressing surface 211 or on one side of the pre-pressing surface 211, as long as the pusher protrusion 212 on all the pre-pressing components 21 is located in the same position on the pre-pressing surface 211.

[0063] To enable the pre-compression component 21 to rotate on the mounting plate 3, in this embodiment, the pre-compression mechanism 2 further includes a rotating shaft 22, with the middle portion of the pre-compression component 21 rotatably mounted on the mounting plate 3 via the rotating shaft 22. Specifically, the pre-compression mechanism 2 also includes a mounting bracket 24, which is mounted on the mounting plate 3. The mounting bracket 24 has a first mounting hole, and the pre-compression component 21 has a second mounting hole 213 corresponding to the first mounting hole. Both ends of the rotating shaft 22 are fixed in the first mounting hole and rotatably pass through the second mounting hole 213. Optionally, the axis of the rotating shaft 22 is coplanar with the pre-compression surface 211. This design avoids the force that causes the tabs to flip outward due to the height difference between the axis of the rotating shaft 22 and the pre-compression surface 211. Flipping the tabs outward would affect the pre-compression effect and lead to poor subsequent cell insertion.

[0064] Optionally, such as Figure 2 , Figure 3 as well as Figure 6 As shown, in this embodiment, along the radial direction of the mounting plate 3, the distance L between the end of the first end 2101 of the pre-pressing component 21 and the axis of the rotating shaft 22 is L = D / 2 + ΔL, where D is the diameter of the end face of the battery cell 100 to be pressed, and ΔL is 2.0mm to 3.5mm. Simulation verification shows that the smaller ΔL is, the smaller the deformation of the pre-pressing surface 211, the better the pre-pressing effect on the battery cell 100 to be pressed, and the smaller the overall size of the battery cell tab pre-pressing device 200, thus reducing manufacturing costs. It is understood that when processing the pre-pressing component 21, the dimension of the pre-pressing surface 211 in the radial direction along the mounting plate 3 should be slightly larger than the radius of the end face of the battery cell 100 to be pressed, so that all the pre-pressing components 21 can completely cover the end face of the battery cell 100 to be pressed when in the second position.

[0065] Figure 7 A schematic diagram of the battery cell tab pre-pressure device 200 provided in this embodiment is shown from another perspective. Figure 8 It shows Figure 7 A cross-sectional view. Figure 9 A schematic diagram of the battery cell tab pre-pressure device 200 provided in this embodiment is shown from another perspective. Figure 10 It shows Figure 9 A cross-sectional view. (See diagram.) Figures 7-9 As shown, the cell tab pre-compression device 200 also includes a drive mechanism 4, which is configured to drive multiple pre-compression components 21 to simultaneously switch from a first position to a second position. By setting the drive mechanism 4 to drive multiple pre-compression components 21 to rotate simultaneously, the number of drive modules can be reduced, the processing cost can be lowered, and the simultaneity of the movement of multiple pre-compression components 21 can be guaranteed, further ensuring the pre-compression effect.

[0066] Specifically, the cell tab preloading device 200 also includes a fixing frame 1, a mounting plate 3 disposed on the fixing frame 1, and a drive mechanism 4 including a pusher 41. The pusher 41 is slidably inserted through the fixing frame 1 and can pass through the center of the mounting plate 3 and abut against the first end 2101 of all the preloading members 21. When the preloading member 21 needs to switch from the first position to the second position, the pusher 41 can be moved along the axial direction of the mounting plate 3, thereby pushing the first end 2101 of the preloading member 21, so that the preloading member 21 rotates about the axial direction of the rotating shaft 22, thereby switching to the second position.

[0067] Furthermore, the drive mechanism 4 also includes a drive arm 42, the middle of which is rotatably connected to the fixed frame 1. One end of the drive arm 42 is connected to the pusher 41, and the other end forms a handheld end. Rotating the drive arm 42 can drive the pusher 41 to move along the axis of the mounting plate 3. When it is necessary to switch the pre-pressed part 21 from the first position to the second position, the operator can hold the handheld end of the drive arm 42 to rotate the drive arm 42 relative to the fixed frame 1, thereby driving the pusher 41 to move along the axis of the mounting plate 3. The structure is simple and the operation is convenient and quick.

[0068] Of course, in other embodiments, the drive arm 42 may not be provided. In this case, the drive mechanism 4 includes a linear drive assembly, which is mounted on the fixed frame 1, and the output end of the linear drive assembly is connected to the pusher 41 to drive the pusher 41 to move along the axis of the mounting plate 3. This arrangement can also achieve the above-mentioned effect and improve the automation level of the battery cell tab pre-pressure device 200. This embodiment does not limit the specific structure of the linear drive assembly. Existing drive devices that can achieve linear drive function, such as cylinders, electric cylinders, and linear motors, can all be used.

[0069] Optionally, in this embodiment, the drive arm 42 is rotatably connected to the fixed frame 1 via the first mounting shaft 43; the drive arm 42 is rotatably connected to the push member 41 via the second mounting shaft 44, so as to ensure the stability of the relative rotation between the drive arm 42 and the fixed frame 1 and between the drive arm 42 and the push member 41.

[0070] Furthermore, the end of the pusher 41 facing away from the drive arm 42 is provided with an abutment plane 411. The first ends 2101 of all the pre-compression members 21 abut against the abutment plane 411 of the pusher 41. When the operator holds the hand end of the drive arm 42 and applies force away from the fixed frame 1, the drive arm 42 can rotate about the first mounting shaft 43 as the axis, thereby causing the end of the drive arm 42 facing away from the hand end to push the pusher 41 towards the pre-compression member 21. At this time, under the interaction between the pre-compression member 21 and the abutment plane 411, the first end 2101 of the pre-compression member 21 can... The pre-pressing member 21 slides on the abutment plane 411 to adjust the relative position between the two. At the same time, the pre-pressing member 21 rotates relative to the rotating shaft 22 to switch from the first position to the second position. When the pre-pressing member 21 is in the second position, the side of the first end 2101 of the pre-pressing member 21 facing the mounting plate 3 is in contact with the abutment plane 411 of the pusher member 41. After the pre-pressing is completed, the operator releases the drive rotating arm 42. The pre-pressing member 21 can switch from the second position to the first position under the action of the elastic restoring force of the reset member 23. At the same time, it pushes the pusher member 41 to move away from the pre-pressing member 21, thereby driving the drive rotating arm 42 to reset.

[0071] Optionally, such as Figure 7 As shown, in this embodiment, the lever ratio of the drive arm 42 is 1 / 3, that is, the ratio of the distance H1 between the first mounting shaft 43 and the second mounting shaft 44 to the distance H2 between the first mounting shaft 43 and the handle of the drive arm 42 is 1 / 3, so that the operator can rotate the drive arm 42 with a small force. Of course, in other embodiments, the lever ratio of the drive arm 42 can be other values, and this embodiment does not limit it.

[0072] like Figure 5 and Figure 8 As shown, to enable the pre-compression component 21 to switch from the second position to the first position, the pre-compression mechanism 2 also includes a reset component 23. The two ends of the reset component 23 are connected to the mounting plate 3 and the second end 2102 of the pre-compression component 21, respectively. When the pre-compression component 21 needs to switch from the second position to the first position, the operator can hold the hand end of the drive arm 42 to rotate it in the opposite direction, thereby moving the pusher 41 away from the mounting plate 3. At this time, each pre-compression component 21 can rotate around the axis of the rotating shaft 22 under the elastic restoring force of its corresponding reset component 23, thus switching to the first position. In this embodiment, the reset component 23 is a spring, which is convenient to install and has a low cost.

[0073] Optionally, a receiving groove 31 is provided on the mounting plate 3 at each position corresponding to the reset member 23. When the pre-compression member 21 is in the second position, the reset member 23 can be compressed and accommodated in the receiving groove 31. By providing a receiving groove 31 that can accommodate the reset member 23, the situation where the pre-compression member 21 cannot be parallel to the mounting plate 3 due to the thickness of the reset member 23 can be avoided, thus ensuring the flatness of the end face of the cell 100 after pre-compression.

[0074] like Figure 5 and Figure 6 As shown, a limiting part 32 is also provided on the mounting plate 3 at the position corresponding to the pre-compression member 21. When the pre-compression member 21 is in the second position, the second end 2102 abuts against the limiting part 32. By providing the limiting part 32, the maximum rotation angle of the pre-compression member 21 can be limited. When the pre-compression member 21 rotates to abut against the limiting part 32, the pre-compression member 21 is exactly parallel to the mounting plate 3, further ensuring the flatness of the end face of the cell 100 after pre-compression. In this embodiment, the limiting part 32 is a limiting step arranged around the receiving groove 31.

[0075] like Figure 8 and Figure 10 As shown, to achieve accurate positioning of the battery cell 100 to be pressurized, the battery cell tab pre-pressurization device 200 also includes a center pin 5. The center pin 5 is inserted at the center of the mounting plate 3 and can extend into the center hole 102 of the battery cell 100 to be pressurized. In this embodiment, one end of the center pin 5 is fixed to the pusher 41, and the other end can pass through the mounting plate 3 and extend into the center hole 102 of the battery cell 100 to be pressurized, so that when the pusher 41 moves along the axial direction of the mounting plate 3, it can simultaneously drive the center pin 5 to extend into or out of the center hole 102. The center pin 5 is connected to the center position of the pusher 41, and the pusher 41, the mounting plate 3, and the center pin 5 are coaxially arranged. By setting the center pin 5, on the one hand, it can play the role of center positioning of the cell to be pressed 100; on the other hand, during the pre-pressing process, since the center pin 5 passes through the center hole 102 of the cell to be pressed 100, it can keep the center hole 102 of the cell to be pressed 100 from being squeezed and damaged, thereby preventing the risk of damage to the electrode and poor welding contact due to deformation and blockage of the center hole 102 when the electrode passes through the center hole 102 for bottom welding in subsequent operations.

[0076] For ease of processing, in this embodiment, the center pin 5 is integrally formed on the pusher 41. Of course, in other embodiments, the center pin 5 can also be connected to the pusher 41 by screws, or directly screwed onto the pusher 41 by threads; this embodiment does not limit this.

[0077] Optionally, the outer diameter of the center pin 5 is 2.5mm to 3.5mm. For example, the outer diameter of the center pin 5 can be 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, etc. Designers can adjust the outer diameter of the center pin 5 according to actual processing requirements to adapt to different specifications of the battery cells 100 to be pressed.

[0078] In this embodiment, the center pin 5 is made of stainless steel, which is low-cost and durable. To extend the service life of the center pin 5, its outer surface is also coated with an anti-wear layer. Optionally, the anti-wear layer is a Teflon coating.

[0079] Figure 11 A schematic diagram of the pre-compression device provided in this embodiment is shown. Figure 11 As shown, this embodiment also provides a pre-pressing device, which includes a frame 500, a clamping device 300, a feeding device 400, and the aforementioned cell tab pre-pressing device 200. The clamping device 300 is disposed on the frame 500 and is used to install the cell 100 to be pressurized. The feeding device 400 includes a drive module 410 and an operating platform 420. The cell tab pre-pressing device 200 is mounted on the operating platform 420, and the drive module 410 is disposed on the frame 500. The output end of the drive module 410 is connected to the operating platform 420 so that the cell tab pre-pressing device 200 can be driven to move in the horizontal and / or vertical direction through the operating platform 420, thereby approaching the cell 100 to be pressurized for pre-pressing operation.

[0080] The following is combined Figures 1-11 Briefly describe the operation procedure of this preloading equipment:

[0081] 1) Install the battery cell 100 to be pressurized onto the clamping device 300 and position it;

[0082] 2) The operator holds the hand end of the drive arm 42 to make the drive arm 42 rotate, thereby driving the pusher 41 to move along the axis of the mounting plate 3 toward the pre-compression member 21, thereby pushing multiple pre-compression members 21 to rotate around the axis of the rotating shaft 22, so that multiple pre-compression members 21 switch from the first position to the second position.

[0083] 3) The feeding device 400 drives the cell tab pre-pressing device 200 to move in the horizontal and / or vertical direction so that the pre-pressing surface 211 of the pre-pressing member 21 contacts the end face of the cell to be pressed 100 (only for contact positioning, at this time the pre-pressing member 21 has no force on the cell to be pressed 100), and at the same time the center pin 5 is inserted into the center hole 102 of the cell to be pressed 100.

[0084] 4) The operator holds the hand end of the drive arm 42 to rotate the drive arm 42, thereby driving the pusher 41 to move away from the pre-compression member 21 along the axis of the mounting plate 3, so that the multiple pre-compression members 21 can switch from the second position to the first position.

[0085] 5) The feeding device 400 drives the cell tab pre-pressing device 200 to feed a preset distance in the horizontal direction (the axial direction of the cell to be pressed 100). Then, the operator holds the hand end of the drive rotating arm 42 to make the drive rotating arm 42 rotate, thereby driving the pusher 41 to move along the axial direction of the mounting plate 3 towards the pre-pressing member 21, thereby pushing multiple pre-pressing members 21 to switch from the first position to the second position. In this process, the pre-pressing operation of the end face of the cell to be pressed 100 is realized.

[0086] 6) Repeat steps 4) to 5) N times to shape the end face of the battery cell 100 to be pressed, and avoid material springback;

[0087] 7) The feeding device 400 drives the cell tab pre-pressing device 200 to move away from the cell to be pressed 100, and then the cell to be pressed 100 is removed from the clamping device 300, reversed, and reinstalled.

[0088] 8) Repeat steps 2) to 6). After pre-pressurization is completed, remove the finished battery cell.

[0089] In this embodiment, the aforementioned preset distance is approximately 1mm to 3.5mm. This embodiment does not limit the preset distance of each horizontal feed of the feeding device 400 driving the cell tab pre-pressing device 200; the operator can adjust this value according to actual processing requirements. Similarly, this embodiment does not limit the specific value of N; the operator can adjust this value according to actual processing requirements.

[0090] It should be noted that both the clamping device 300 and the feeding device 400 are relatively mature devices in the prior art. The specific structure and working principle of the clamping device 300 and the feeding device 400 will not be described in detail in this embodiment.

[0091] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-loading device for battery cell tabs, characterized in that, include: Installation disk (3); The pre-compression mechanism (2) includes a plurality of pre-compression components (21) radially distributed on the mounting plate (3) with the center of the mounting plate (3) as the center. Each pre-compression component (21) includes a first end (2101) close to the center of the mounting plate (3) and a second end (2102) away from the center of the mounting plate (3). The first end (2101) is provided with a pre-compression surface (211), and the pre-compression surface (211) is also provided with a pusher protrusion (212) extending radially along the mounting plate (3). The middle part of each pre-compression component (21) is rotatably disposed on the mounting plate (3) to switch between a first position and a second position. When the pre-pressing member (21) is in the first position, the second end (2102) is tilted away from the mounting plate (3). When the pre-pressing member (21) is in the second position, the pre-pressing member (21) is parallel to the mounting plate (3). During the process of the pre-pressing member (21) switching from the first position to the second position, the pre-pressing operation of the tab of the cell to be pressed (100) is realized, and a pressure groove (101) of the cell tab is formed on the end face of the cell to be pressed (100) corresponding to the position of the pusher protrusion (212).

2. The cell tab pre-loading device according to claim 1, characterized in that, The pre-compression component (21) is rotatably mounted on the mounting plate (3) via a rotating shaft (22), and the axis of the rotating shaft (22) is coplanar with the pre-compression surface (211).

3. The cell tab pre-loading device according to claim 2, characterized in that, Along the radial direction of the mounting plate (3), the distance between the end of the first end (2101) of the preload member (21) and the axis of the rotating shaft (22) is L = D / 2 + ΔL; Where D is the diameter of the end face of the cell (100) to be pressurized, and ΔL is 2.0mm~3.5mm.

4. The cell tab pre-loading device according to claim 1, characterized in that, The cell tab pre-pressing device further includes a drive mechanism (4), which is configured to drive multiple pre-pressing elements (21) to switch simultaneously from the first position to the second position.

5. The cell tab pre-loading device according to claim 4, characterized in that, The pre-compression device for the battery cell tabs also includes a fixing frame (1), the mounting plate (3) is disposed on the fixing frame (1), and the driving mechanism (4) includes a pusher (41), the pusher (41) is slidably disposed on the fixing frame (1) and can pass through the center of the mounting plate (3) and abut against the first end (2101) of all the pre-compression members (21).

6. The cell tab pre-loading device according to claim 5, characterized in that, The drive mechanism (4) further includes a drive arm (42), the middle part of which is rotatably connected to the fixed frame (1). One end of the drive arm (42) is connected to the push member (41), and the other end of the drive arm (42) forms a handheld end. Rotating the drive arm (42) can drive the push member (41) to move along the axial direction of the mounting plate (3).

7. The cell tab pre-loading device according to claim 1, characterized in that, The pre-compression mechanism (2) further includes a reset member (23), the two ends of which are connected to the mounting plate (3) and the second end (2102), respectively.

8. The cell tab pre-loading device according to claim 7, characterized in that, The mounting plate (3) is provided with a receiving groove (31) at the position corresponding to the reset member (23). When the pre-compression member (21) is in the second position, the reset member (23) can be compressed and accommodated in the receiving groove (31).

9. The cell tab pre-loading device according to claim 1, characterized in that, The mounting plate (3) is also provided with a limiting part (32) corresponding to the position of the pre-compression member (21). When the pre-compression member (21) is in the second position, the second end (2102) abuts against the limiting part (32).

10. The cell tab pre-loading device according to any one of claims 1 to 9, characterized in that, The pre-pressurization device for the battery cell tabs also includes a center pin (5), which is located at the center of the mounting plate (3) and can extend into the center hole (102) of the battery cell (100) to be pressurized.

11. The cell tab pre-loading device according to any one of claims 1 to 9, characterized in that, The height of the pusher ridge (212) gradually decreases towards the center of the mounting plate (3).

12. The cell tab pre-loading device according to claim 11, characterized in that, The height of the end of the pusher ridge (212) near the center of the mounting plate (3) is 0.3mm to 0.6mm; and / or The height of the end of the pusher ridge (212) furthest from the center of the mounting plate (3) is 0.7mm to 1.2mm; and / or The width of the pusher protrusion (212) is 0.2mm to 1.5mm.

13. A pre-compression device, characterized in that, include: Rack (500); A clamping device (300) is disposed on the frame (500), and the clamping device (300) is used to install the battery cell (100) to be pressed; The cell tab pre-loading device as described in any one of claims 1 to 12; The feeding device (400) includes a drive module (410) and an operating platform (420). The cell tab pre-pressing device is mounted on the operating platform (420). The drive module (410) is mounted on the frame (500), and the output end of the drive module (410) is connected to the operating platform (420) so that the cell tab pre-pressing device can be driven to move in the horizontal and / or vertical direction through the operating platform (420) to approach the cell to be pre-pressed (100) for pre-pressing operation.

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