A segmented cap process for lithium battery cells and a cell platform and a capping head thereof
By employing a segmented fitting process and vacuum adsorption, the problems of tab bending and cell stability were solved, achieving stability in tab flatness and cell position, and improving capping accuracy and efficiency.
Patent Information
- Application Number
- CN202511349862.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2045-09-22
AI Technical Summary
In the capping process of lithium battery cells, the tabs are prone to bending due to their own weight and deformation when in contact with the cell body, resulting in positional displacement and compression deformation, which affects the accuracy and stability of the capping.
A segmented insertion process is adopted, in which the inner and outer parts of the tab are supported by support blocks and pressure blocks respectively, and the tabs are shaped and flattened. Combined with vacuum adsorption and flexible contact, the flatness of the tabs and the stability of the cell body are ensured.
It effectively reduces tab bending, maintains tab flatness, reduces cell body compression deformation, improves capping accuracy and stability, and increases yield.
Smart Images
Figure CN120878986B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy battery manufacturing processes, and in particular to a segmented capping process for lithium battery cells, its cell platform, and its capping head. Background Technology
[0002] A battery cell is the core structure of a lithium-ion battery. It refers to a single electrochemical cell containing positive and negative electrodes. It is not used directly; the cell and the protection circuit board together form a battery that can be used directly. The cell includes the cell body, which is generally a block or columnar structure. It contains multiple layers of positive and negative electrodes, which are filled with electrolyte to form the cell body. One end wall of the cell body has flexible sheet-like positive and negative electrode plates that extend outwards for connection to the circuit to provide power.
[0003] In the manufacturing process of battery cells, an intermediate step is the capping process, which involves nesting a cap onto the end wall of the battery cell body. The cap has a box-shaped structure with a through hole in its center corresponding to the horizontally extending tabs of the battery cell body. During the capping process, the cap needs to be set vertically and fitted onto the end wall of the battery cell body with the tabs extending outwards, ensuring that the horizontal tabs pass through the through hole in the cap. Due to the requirements of the capping process, when the cap is fitted onto the battery cell body, the tabs need to pass through the hole in the cap. However, since the tabs are made of flexible material and extend horizontally to the outside of the battery cell body, they will bend and deform under their own weight. Furthermore, the tabs are prone to bending due to contact with the cap during insertion into the cap. Therefore, it is necessary to design a capping process that can effectively reduce the impact on the flatness of the tabs during the capping process. Furthermore, during the capping process, the cap body's contact and collision with the battery cell body can easily cause localized compression deformation and lead to a relative positional shift between the tab and the battery cell body. Therefore, it is necessary to reduce the compression and collision forces on the battery cell body during the capping process. Additionally, the positional stability of the battery cell body must be ensured during capping to allow the cap body to accurately fit onto the tab and be properly positioned. After capping is completed, the cap body must be kept in a pressed state to maintain positional stability during the transfer of the battery cell body and cap body to different workstations. Summary of the Invention
[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a segmented capping process for lithium battery cells, a cell platform, and a capping head. The process employs a segmented fitting method, fitting the outer and inner portions of the tab separately, effectively reducing tab bending during the capping process. Furthermore, the segmented pressing and shaping of the tab reduces bending while simultaneously shaping it, ensuring flatness during capping. It also features flexible contact pressing to reduce compression deformation of the cell body during capping, and uses adsorption and compression to ensure positional stability of the cell body. Finally, it features lateral pressing and fixing after capping to ensure positional stability of the cap during transfer.
[0005] The technical solution adopted in this invention is as follows: a segmented capping process for lithium battery cells, comprising the following process steps:
[0006] S1, electrode tab: The battery cell placed on the battery cell platform is horizontally pressed by the battery cell platform, and the end with the electrode tab extends outward to the outside of the battery cell platform; the first upper support block and the second upper support block located below the battery cell platform support the suspended electrode tab from below;
[0007] S2, Press the inner tab: The first pressing block located above the cell platform presses down from above the inner part of the tab in step S1;
[0008] S3, Pressing and Shaping the Outer Tab: The second pressing block located above the cell platform presses down on the outer part of the tab in step S2 from above, forming a flat pressing and shaping of the tab.
[0009] S4. Loosen the outer tab: After the tab is flattened and shaped in step S3, the second upper support block and the second lower pressure block move downward and upward respectively to loosen the outer part of the tab.
[0010] S5. Fitting the outer tab: The capped head located on the outside of the cell platform moves horizontally towards the cell platform and is fitted onto the outer part of the tab that was released in step S4.
[0011] S6. Loosen the inner tab and attach the tab root: The first upper support block and the first lower support block move downward and upward respectively to loosen the inner part of the tab; the cap head in step S5 drives the cap body to continue to move horizontally towards the cell platform, attaching the inner part of the tab and attaching it to the side wall of the cell body.
[0012] S7, Side-press cap: After the cap body is put on in step S6, the cap head is pushed back, and the side-pressing mechanism of the cell platform presses the cap body from the top and side.
[0013] Preferably, the battery cell includes a battery cell body, tabs, and a cap, wherein the battery cell body is a block structure; the tabs include two pieces, which are respectively spaced apart on the end sidewall of the battery cell body; the cap is a cover structure with one side open, used to pass through the tabs and fit on the end sidewall of the cap, and the inside of the cap has a through groove so that the tabs can pass through when the cap is on.
[0014] Preferably, in step S1, the cell platform horizontally supports the cell body, and the cell body is fixed by vacuum negative pressure adsorption, and the cell body is fixed by pressure blocks.
[0015] Preferably, in step S5, the end of the cap head is embedded with the cap body to be assembled, and the cap body is fixed inward by vacuum negative pressure. The end of the cap head is provided with a clearance groove so that when the cap is worn, the tabs extend horizontally outward through the cap body.
[0016] Preferably, the cap head flexibly adsorbs the cap body in the horizontal direction and flexibly contacts the battery cell body during the cap-wearing process.
[0017] A capping head for a segmented capping process of lithium battery cells includes a rotating shaft, a capping support, buffer springs, a capping slide, a capping block, and an air nozzle. The rotating shaft is horizontally positioned, with one end connected to an external drive mechanism for driving the capping action. The capping support, an L-shaped seat with one end protruding upwards, is located at the other end of the rotating shaft. The capping slide is slidably mounted on the capping support. Two buffer springs are arranged parallel and spaced apart, with one end connected to the capping support. The first end is on the seat, and the second end is connected to the capped slide to provide elastic cushioning when the capped slide slides. The capped block is set on the capped support, and the outer end of the capped block has a U-shaped opening groove. Vacuum suction holes are arranged in the groove. An air passage is arranged in the capped block, and one end of the air passage is connected to the vacuum suction hole. The air nozzle is set on the side of the capped block and connected to the other end of the air passage for vacuum pumping, so as to adsorb the cap body in the groove through vacuum negative pressure. An anti-cavity groove is provided on the inner side of the groove so that when the cap is on, the tabs pass through the cap body and extend into the anti-cavity groove.
[0018] A cell platform for a segmented capping process of lithium battery cells includes a platform support, a bearing suction seat, a guide limiting seat, a piezoelectric cell assembly, and a side pressing assembly. The platform support is horizontally positioned. The bearing suction seat is horizontally positioned on the platform support and has at least two vacuum suction holes. The cell body to be assembled is horizontally positioned on the bearing suction seat and is fixed by vacuum negative pressure generated by the vacuum suction holes. The platform support has a through groove running vertically. The guide limiting seat is located at the edge of the platform support and on one side of the through groove, and has an arc-shaped limiting bearing groove inside. The piezoelectric cell assembly is positioned below the platform support and extends above the platform support to press the cell body from above. The side pressing assembly is positioned below the platform support and extends upwards to simultaneously press and fix the cell body onto the cap from above and from the side.
[0019] Preferably, the piezoelectric cell assembly includes a pressing cylinder, a pressing shaft, a pressing block, and a guide roller. The pressing cylinder is positioned below the platform support with its output end facing upwards. The pressing shaft is vertically connected to the output end of the pressing cylinder and extends upwards through the platform support. The pressing block is horizontally positioned on top of the pressing shaft, with one end extending horizontally above the cell body. The guide roller is positioned at the other end of the pressing block and extends into the limiting groove of the guide limiting seat. The pressing cylinder drives the pressing block to move up and down via the pressing shaft, pressing it flat against the cell body from above, and sliding within the limiting groove via the guide roller for guiding and limiting.
[0020] Preferably, the side-pressure assembly includes a support block, a first slider, a first cylinder, a second slider, a second cylinder, a lower pressure plate, a first spring, and a second spring. The support block is horizontally positioned at the bottom of the platform support, and one side edge of the support block has a support portion extending downwards perpendicular to the support block. The first slider has an L-shaped block structure, and one side plate of the first slider is slidably connected to the side wall of the support block. The first cylinder is mounted on the first slider, and its output end passes through the first slider and pushes against the support portion. When the first cylinder outputs power, its output end pushes against the support portion, and the reaction force of the support portion pushes the first cylinder and the first slider to slide on the support block. The second slider is slidably mounted on the other side plate of the first slider, and one side of the second slider first extends upwards through a through groove, then extends horizontally to... Above the tab of the battery cell body; the second cylinder is mounted on the second slider, and the second cylinder outputs power in a direction perpendicular to the first cylinder. The output end of the second cylinder passes through the second slider and pushes against the first slider. The reaction force of the second slider pushes the second slider to move linearly. The lower pressure plate is located at the part of the second slider that extends horizontally to above the tab. The lower pressure plate moves with the second slider to press down and shape the tab from above. The two ends of the first spring are respectively connected to the first slider and the support block. In its natural state, the elastic force of the first spring pulls the first slider in the opposite direction to the first cylinder. The two ends of the second spring are respectively connected to the second slider and the first slider. In its natural state, the elastic force of the second spring pulls the second slider in the opposite direction to the second cylinder.
[0021] The beneficial effects of this invention are as follows:
[0022] This invention addresses the shortcomings and deficiencies of existing technologies by independently developing and designing a segmented fitting process for lithium battery cells. This process involves fitting the outer and inner portions of the tab separately, effectively reducing tab bending during the capping process. Furthermore, the segmented pressing and shaping of the tab reduces bending while simultaneously ensuring flatness during capping. It also features flexible contact pressing to reduce compression deformation of the cell body during capping, and uses adsorption and compression to ensure the cell body's positional stability. Finally, it incorporates side-pressing fixation after capping to guarantee the positional stability of the cap during transfer. This invention also includes a segmented capping process for lithium battery cells, a cell platform, and a capping head.
[0023] This invention aims to provide a method for automated cell assembly in the field of new energy batteries. It belongs to the field of automated cell assembly technology and its function is to automatically assemble caps on the cell body. Under the premise of ensuring the relative stability of the cell body position, the relative stability of the tab and the cell body position, and the flatness of the tab, the caps are automatically nested on the cell body. This effectively improves the capping accuracy and efficiency while increasing the capping yield.
[0024] To address the requirement that the tabs extend beyond the cell body during capping and must accurately pass through the cap's groove, and to prevent the tabs from bending due to their own weight and failing to insert, this invention employs a segmented capping process. The horizontally extending tab is divided into an outer and an inner section, which are independently fitted into the cap. Two sets of corresponding upper and lower support blocks work together. Before capping, the first upper support block and the first lower pressure block support the inner section of the tab from below and press it down from above, respectively. The second upper support block and the second lower pressure block support the outer section of the tab from below and press it down from above, respectively, maintaining the flatness of the tab surface and ensuring... While providing support, the tabs are shaped and flattened before capping, effectively ensuring the flatness of the tab surface during capping. During the capping process, the second upper support block and the second lower pressure block on the outer side of the tab move downwards and upwards respectively, and the capping head horizontally inserts the cap into the outer side of the tab, completing the first stage of capping. Then, the first upper support block and the first lower pressure block on the inner side of the tab move downwards and upwards respectively, and the capping head continues to approach the cell body and insert into the root of the tab until it is fitted onto the side end face of the cell body, completing the second stage of capping. By using the segmented capping process, the downward bending of the tab due to its own weight can be effectively reduced, ensuring the flatness of the tab during the capping process.
[0025] Furthermore, this invention designs a cell platform to support the cell body. To ensure the positional accuracy of the cell body during assembly and the surface flatness of the tabs connected to its end walls, the cell platform is equipped with a cell pressing assembly and a side pressing assembly. The pressing cylinder of the cell pressing assembly is located below the platform support, and the pressing shaft connected to the output end extends upward through the platform support to drive the pressing block located at the top of the pressing shaft to move up and down, thereby pressing the cell body flat from above to ensure its positional stability during assembly. At the same time, to avoid excessive compression of the cell body and the accuracy of its pressing position during the pressing process, the pressing block slides in the limiting bearing groove of the guide limiting seat on the platform support through the guide groove at the end of the pressing block, so as to achieve the guiding and limiting of the pressing block during the pressing process. After pressing, the part of the cell body with tabs on the side to be assembled extends to the outside of the bearing suction seat and the pressing block, and is in a suspended state to facilitate the subsequent assembly of the cap. To prevent the suspended tabs from bending due to their own weight, thus affecting their flatness, an upper support mechanism is installed below to support the suspended tabs from below, while a side pressing component presses down on the tabs from above to ensure their surface flatness. The side pressing component uses a support block horizontally set at the bottom of the platform support as a load-bearing structure. The position of the lower pressing plate is adjusted by the first and second slide blocks that slide linearly in the same plane in mutually perpendicular directions, so that they are aligned with the edge of the cell body and pressed down. The first and second slide blocks slide under the driving force of the first and second cylinders respectively, driven by the opposing forces. The lower pressing plate has an L-shaped notch, which presses down along the edge of the cell body. The inner side wall flattens the wrinkles on the end face of the cell body, while the bottom surface presses down to flatten the tabs connected to the end face of the cell body. Thus, the flattening and pressing of the side face of the cell body and the surface of the tabs are completed in one press.
[0026] Furthermore, as the capping execution component, the capping head of the present invention uses a rotating shaft as the connecting structure, and an L-shaped capping support sleeved on the rotating shaft as the supporting structure. A capping slide is slidably connected to the capping support, and the capping slide and the capping support are connected by a buffer spring so that the capping block set at the end of the capping slide has elastic buffering force when picking up and putting down the cap, reducing the squeezing deformation of the cap on the side end face of the battery cell body during the capping process, and ensuring the capping quality. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the capping process steps of the present invention.
[0028] Figure 2 This is a three-dimensional structural diagram of the battery cell of the present invention.
[0029] Figure 3 This is one of the three-dimensional structural diagrams of the present invention with a cap.
[0030] Figure 4 This is the second schematic diagram of the three-dimensional structure of the present invention with a cap.
[0031] Figure 5 This is one of the three-dimensional structural schematic diagrams of the battery cell platform of the present invention.
[0032] Figure 6 This is the second three-dimensional structural schematic diagram of the battery cell platform of the present invention.
[0033] Figure 7 This is the third three-dimensional structural schematic diagram of the battery cell platform of the present invention.
[0034] Figure 8 This is one of the three-dimensional structural diagrams of the battery cell platform of the present invention after the components are hidden.
[0035] Figure 9 This is the second three-dimensional structural diagram of the battery cell platform of the present invention with hidden components.
[0036] Figure 10 This is one of the three-dimensional structural schematic diagrams of the side pressure mechanism of the present invention.
[0037] Figure 11 This is the second three-dimensional structural schematic diagram of the side-pressure mechanism of the present invention.
[0038] Figure 12 This is the third three-dimensional structural schematic diagram of the side-pressure mechanism of the present invention.
[0039] Figure 13 This is the fourth three-dimensional structural schematic diagram of the side-pressure mechanism of the present invention.
[0040] In the picture:
[0041] 0. Battery cell; 1. Battery cell platform; 2. First upper support block; 3. Second upper support block; 4. First lower pressure block; 5. Second lower pressure block; 6. Capped end cap;
[0042] 01. Battery cell body; 02. Electrode tab; 03. Cap body; A. Sleeve groove;
[0043] 61. Rotating shaft; 62. Capped support; 63. Buffer spring; 64. Capped slide; 65. Capped block; 66. Air nozzle; B. Suction groove; C. Clearance groove; D. Limiting bearing groove;
[0044] 11. Platform support; 12. Bearing suction seat; 13. Guide limit seat; 14. Clamping cylinder; 15. Clamping shaft; 16. Clamping block; 17. Guide roller; 18. Side pressure assembly; E. Through groove;
[0045] 181. Support block; 182. First slider; 183. First cylinder; 184. Second slider; 185. Second cylinder; 186. Lower pressure plate; 187. First spring; 188. Second spring. Detailed Implementation
[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0047] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0048] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1
[0049] like Figure 1 and Figure 2 As shown, this invention proposes a segmented capping process for lithium battery cells, comprising the following process steps:
[0050] S1, electrode tab: The battery cell placed on the battery cell platform is horizontally pressed by the battery cell platform, and the end with the electrode tab extends outward to the outside of the battery cell platform; the first upper support block and the second upper support block located below the battery cell platform support the suspended electrode tab from below;
[0051] S2, Press the inner tab: The first pressing block located above the cell platform presses down from above the inner part of the tab in step S1;
[0052] S3, Pressing and Shaping the Outer Tab: The second pressing block located above the cell platform presses down on the outer part of the tab in step S2 from above, forming a flat pressing and shaping of the tab.
[0053] S4. Loosen the outer tab: After the tab is flattened and shaped in step S3, the second upper support block and the second lower pressure block move downward and upward respectively to loosen the outer part of the tab.
[0054] S5. Fitting the outer tab: The capped head located on the outside of the cell platform moves horizontally towards the cell platform and is fitted onto the outer part of the tab that was released in step S4.
[0055] S6. Loosen the inner tab and attach the tab root: The first upper support block and the first lower support block move downward and upward respectively to loosen the inner part of the tab; the cap head in step S5 drives the cap body to continue to move horizontally towards the cell platform, attaching the inner part of the tab and attaching it to the side wall of the cell body.
[0056] S7, Side-press cap: After the cap body is put on in step S6, the cap head is pushed back, and the side-pressing mechanism of the cell platform presses the cap body from the top and side.
[0057] The battery cell includes a battery cell body 01, tabs 02, and a cap 03. The battery cell body 01 is a block structure. The tabs 02 include two pieces, which are respectively and spaced apart on the end sidewall of the battery cell body 01. The cap 03 is a cover structure with one side open, which is used to pass through the tabs 02 and fit on the end sidewall of the cap 03. The cap 03 has a through groove A inside so that the tabs 02 can pass through when the cap is on.
[0058] In step S1, the cell platform horizontally supports the cell body, and the cell body is fixed by vacuum negative pressure adsorption, and the cell body is fixed by pressure block.
[0059] In step S5, the end of the cap head is embedded with the cap body to be assembled, and the cap body is fixed inward by vacuum negative pressure. The end of the cap head is provided with a clearance groove so that when the cap is worn, the tabs extend horizontally outward through the cap body.
[0060] The capped head flexibly adheres to the cap body in the horizontal direction and flexibly contacts the battery cell body during the capping process.
[0061] Furthermore, the aforementioned "first upper support block", "second upper support block", "first lower support block" and "second lower support block" are mechanisms disposed outside the battery cell platform, which can be driven by cylinders or motors to move in the vertical or horizontal direction. The driving method is a conventional technology in this field; therefore, the "first upper support block", "second upper support block", "first lower support block" and "second lower support block" are not described in detail in this application.
[0062] Furthermore, this invention designs a segmented fitting process for lithium battery cells, employing a segmented fitting method to separately fit the outer and inner portions of the tab, effectively reducing tab bending during the capping process. The segmented pressing and shaping of the tab reduces bending while simultaneously shaping it, ensuring its flatness during capping. It also features flexible contact pressing to reduce compression deformation of the cell body during capping, and uses adsorption and compression to ensure the cell body's positional stability. Finally, it includes a side-press fixing feature after capping to ensure the cap's positional stability during transfer. This invention also includes a segmented capping process for lithium battery cells, a cell platform, and a capping head.
[0063] This invention aims to provide a method for automated cell assembly in the field of new energy batteries. It belongs to the field of automated cell assembly technology and its function is to automatically assemble caps on the cell body. Under the premise of ensuring the relative stability of the cell body position, the relative stability of the tab and the cell body position, and the flatness of the tab, the caps are automatically nested on the cell body. This effectively improves the capping accuracy and efficiency while increasing the capping yield.
[0064] To address the requirement that the tabs extend beyond the cell body during capping and must accurately pass through the cap's groove, and to prevent the tabs from bending due to their own weight and failing to insert, this invention employs a segmented capping process. The horizontally extending tab is divided into an outer and an inner section, which are independently fitted into the cap. Two sets of corresponding upper and lower support blocks work together. Before capping, the first upper support block and the first lower pressure block support the inner section of the tab from below and press it down from above, respectively. The second upper support block and the second lower pressure block support the outer section of the tab from below and press it down from above, respectively, maintaining the flatness of the tab surface and ensuring... While providing support, the tabs are shaped and flattened before capping, effectively ensuring the flatness of the tab surface during capping. During the capping process, the second upper support block and the second lower pressure block on the outer side of the tab move downwards and upwards respectively, and the capping head horizontally inserts the cap into the outer side of the tab, completing the first stage of capping. Then, the first upper support block and the first lower pressure block on the inner side of the tab move downwards and upwards respectively, and the capping head continues to approach the cell body and insert into the root of the tab until it is fitted onto the side end face of the cell body, completing the second stage of capping. By using the segmented capping process, the downward bending of the tab due to its own weight can be effectively reduced, ensuring the flatness of the tab during the capping process. Example 2
[0065] like Figures 3 to 4As shown in the figure, as an embodiment of the present invention, the present invention discloses a capping head for a segmented capping process of lithium battery cells, including a rotating shaft 61, a capping support 62, a buffer spring 63, a capping slide 64, a capping block 65, and an air nozzle 66. The rotating shaft 61 is horizontally arranged, with one end connected to an external driving mechanism for driving the capping body to be picked up and put on. The capping support 62 is located at the other end of the rotating shaft 61 and is an L-shaped seat with one end protruding upwards. The capping slide 64 is slidably arranged on the capping support 62. Two buffer springs 63 are arranged parallel and spaced apart. One end of 3 is connected to the capped support 62, and the other end is connected to the capped slide 64, providing elastic cushioning when the capped slide 64 slides; the capped block 65 is set on the capped support 62, and the outer end of the capped block 65 is provided with a U-shaped opening groove B; the groove B is provided with vacuum suction holes; the capped block 65 is provided with an air passage, one end of which is connected to the vacuum suction hole; the air nozzle 66 is set on the side of the capped block 65 and connected to the other end of the air passage, for vacuum pumping, so as to adsorb the cap body 03 in the groove B through vacuum negative pressure; the inner side of the groove B is provided with a clearance groove C, so that when the cap is on, the tab 02 passes through the cap body 03 and extends into the clearance groove C.
[0066] Furthermore, as the capping execution component, the capping head of the present invention uses a rotating shaft as the connecting structure, and an L-shaped capping support sleeved on the rotating shaft as the supporting structure. A capping slide is slidably connected to the capping support, and the capping slide and the capping support are connected by a buffer spring so that the capping block set at the end of the capping slide has elastic buffering force when picking up and putting down the cap, reducing the squeezing deformation of the cap on the side end face of the battery cell body during the capping process, and ensuring the capping quality. Example 3
[0067] like Figures 5 to 13As shown in the figure, as an embodiment of the present invention, the present invention discloses a battery cell platform for a segmented capping process, including a platform support 11, a bearing suction seat 12, a guide limiting seat 13, a cell pressing assembly, and a side pressing assembly 18. The platform support 11 is horizontally arranged; the bearing suction seat 12 is horizontally arranged on the platform support 11, and the bearing suction seat 12 is provided with at least two vacuum suction holes. The battery cell body 01 to be assembled is horizontally arranged on the bearing suction seat 12 and is fixed by vacuum negative pressure generated by the vacuum suction holes; the platform support 11 is horizontally arranged on the bearing suction seat 12, ... The platform support 11 has a through groove E extending vertically; the guide limiting seat 13 is located at the edge of the platform support 11 and on one side of the through groove E, and the guide limiting seat 13 has an arc-shaped limiting bearing groove D; the piezoelectric core assembly is located below the platform support 11 and extends above the platform support 11 to press the cell body 01 from above; the side pressing assembly 18 is located below the platform support 11 and extends upward to press and fix the cap 03 of the cell body 01 simultaneously from above and from the side.
[0068] The piezoelectric cell assembly includes a pressing cylinder 14, a pressing shaft 15, a pressing block 16, and a guide roller 17. The pressing cylinder 14 is located below the platform support 11 with its output end facing upwards. The pressing shaft 15 is vertically connected to the output end of the pressing cylinder 14 and extends upwards through the platform support 11. The pressing block 16 is horizontally located on top of the pressing shaft 15, with one end extending horizontally above the cell body 01. The guide roller 17 is located at the other end of the pressing block 16 and extends into the limiting bearing groove D of the guide limiting seat 13. The pressing cylinder 14 drives the pressing block 16 to move up and down via the pressing shaft 15, pressing it flat against the cell body 01 from above, and sliding within the limiting bearing groove D via the guide roller 17 for guiding and limiting.
[0069] The side pressure assembly 18 includes a support block 181, a first slider 182, a first cylinder 183, a second slider 184, a second cylinder 185, a lower pressure plate 186, a first spring 187, and a second spring 188. The support block 181 is horizontally disposed at the bottom of the platform support 11, and a support portion extending downward perpendicularly to the support block 181 is provided on one side edge. The first slider 182 has an L-shaped block structure, and one side plate of the first slider 182 is slidably connected to the side wall of the support block 181. The first cylinder 183 is mounted on the first slider 182. The output end of the first cylinder 183 passes through the first slider 182 and pushes against the support. When the first cylinder 183 outputs power, its output end pushes against the support, and the reaction force of the support pushes the first cylinder 183 and the first slider 182 to slide on the support block 181. The second slider 184 is slidably mounted on the other side plate of the first slider 182. One side of the second slider 184 first extends upward through the through slot E, and then extends horizontally to above the electrode tab of the cell body 01. The second cylinder 185 is mounted on the second slider 184. The second cylinder 185 outputs power in a direction perpendicular to the first cylinder 183. The output end of the second cylinder 185 passes through the second slider 184 and pushes against the first slider 182. The output power of the second cylinder 185 pushes against the first slider 182, and the reaction force of the first slider 182 pushes the second slider 184 to move linearly. The lower pressure plate 186 is mounted on the part of the second slider 184 that extends horizontally to above the electrode tab. 186 moves with the second slider 184 to press down on the shaping tab from above; the two ends of the first spring 187 are respectively connected to the first slider 182 and the support block 181. In its natural state, the elastic force of the first spring 187 pulls the first slider 182 in the opposite direction to the first cylinder 183; the two ends of the second spring 188 are respectively connected to the second slider 184 and the first slider 182. In its natural state, the elastic force of the second spring 188 pulls the second slider 184 in the opposite direction to the second cylinder 185.
[0070] Furthermore, this invention designs a cell platform to support the cell body. To ensure the positional accuracy of the cell body during assembly and the surface flatness of the tabs connected to its end walls, the cell platform is equipped with a cell pressing assembly and a side pressing assembly. The pressing cylinder of the cell pressing assembly is located below the platform support, and the pressing shaft connected to the output end extends upward through the platform support to drive the pressing block located at the top of the pressing shaft to move up and down, thereby pressing the cell body flat from above to ensure its positional stability during assembly. At the same time, to avoid excessive compression of the cell body and the accuracy of its pressing position during the pressing process, the pressing block slides in the limiting bearing groove of the guide limiting seat on the platform support through the guide groove at the end of the pressing block, so as to achieve the guiding and limiting of the pressing block during the pressing process. After pressing, the part of the cell body with tabs on the side to be assembled extends to the outside of the bearing suction seat and the pressing block, and is in a suspended state to facilitate the subsequent assembly of the cap. To prevent the suspended tabs from bending due to their own weight, thus affecting their flatness, an upper support mechanism is installed below to support the suspended tabs from below, while a side pressing component presses down on the tabs from above to ensure their surface flatness. The side pressing component uses a support block horizontally set at the bottom of the platform support as a load-bearing structure. The position of the lower pressing plate is adjusted by the first and second slide blocks that slide linearly in the same plane in mutually perpendicular directions, so that they are aligned with the edge of the cell body and pressed down. The first and second slide blocks slide under the driving force of the first and second cylinders respectively, driven by the opposing forces. The lower pressing plate has an L-shaped notch, which presses down along the edge of the cell body. The inner side wall flattens the wrinkles on the end face of the cell body, while the bottom surface presses down to flatten the tabs connected to the end face of the cell body. Thus, the flattening and pressing of the side face of the cell body and the surface of the tabs are completed in one press.
[0071] The embodiments of this invention are merely illustrative of specific implementation methods and are not intended to limit the scope of protection. Those skilled in the art can make modifications based on these embodiments; therefore, all equivalent changes or modifications made in accordance with the scope of this invention's patent claims fall within the scope of this invention's patent claims.
Claims
1. A segmented capping process for lithium battery cells, characterized in that, The process includes the following steps: S1, electrode tab: The battery cell placed on the battery cell platform is horizontally pressed by the battery cell platform, and the end with the electrode tab extends outward to the outside of the battery cell platform; the first upper support block and the second upper support block located below the battery cell platform support the suspended electrode tab from below; S2, Press the inner tab: The first pressing block located above the cell platform presses down from above the inner part of the tab in step S1; S3, Pressing and Shaping the Outer Tab: The second pressing block located above the cell platform presses down on the outer part of the tab in step S2 from above, forming a flat pressing and shaping of the tab. S4. Loosen the outer tab: After the tab is flattened and shaped in step S3, the second upper support block and the second lower pressure block move downward and upward respectively to loosen the outer part of the tab. S5. Fitting the outer tab: The capped head located on the outside of the cell platform moves horizontally towards the cell platform and is fitted onto the outer part of the tab that was released in step S4. S6. Loosen the inner tab and attach the tab root: The first upper support block and the first lower support block move downward and upward respectively to loosen the inner part of the tab; the cap head in step S5 drives the cap body to continue to move horizontally towards the cell platform, attaching the inner part of the tab and attaching it to the side wall of the cell body. S7, Side-press cap: After the cap body is put on in step S6, the cap head is pushed back, and the side-pressing mechanism of the cell platform presses the cap body from the top and side.
2. The segmented capping process for lithium battery cells according to claim 1, characterized in that: The battery cell includes a battery cell body (01), tabs (02), and a cap (03). The battery cell body (01) is a block structure. The tabs (02) include two pieces, which are respectively spaced apart on the end sidewall of the battery cell body (01). The cap (03) is a cover structure with one side open, which is used to pass through the tabs (02) and fit on the end sidewall of the cap (03). The cap (03) has a through groove (A) inside so that the tabs (02) can pass through when the cap is on.
3. The segmented capping process for lithium battery cells according to claim 1, characterized in that: In step S1, the cell platform horizontally supports the cell body, and the cell body is fixed by vacuum negative pressure adsorption, and the cell body is fixed by pressure blocks.
4. The segmented capping process for lithium battery cells according to claim 1, characterized in that: In step S5, the end of the cap head is embedded with the cap body to be assembled, and the cap body is fixed inward by vacuum negative pressure. The end of the cap head is provided with a clearance groove so that when the cap is worn, the tabs extend horizontally outward through the cap body.
5. The segmented capping process for lithium battery cells according to claim 4, characterized in that: The capped head flexibly adsorbs the cap body in the horizontal direction and flexibly contacts the battery cell body during the capping process.
6. A capping head used in the segmented capping process of lithium battery cells as described in claim 1, characterized in that: The system includes a rotating shaft (61), a capped support (62), a buffer spring (63), a capped slide (64), a capped block (65), and an air nozzle (66). The rotating shaft (61) is horizontally positioned, with one end connected to an external drive mechanism for driving the capping and attaching the cap. The capped support (62) is located at the other end of the rotating shaft (61) and is an L-shaped seat with one end protruding upwards. The capped slide (64) is slidably mounted on the capped support (62). The buffer spring (63) consists of two springs arranged parallel and spaced apart. One end of each spring is connected to the capped support (62), and the other end... Connected to the capped slide (64), it provides elastic cushioning when the capped slide (64) slides; the capped block (65) is set on the capped support (62), and the outer end of the capped block (65) is provided with a U-shaped opening structure groove (B); the groove (B) is provided with vacuum suction holes; the capped block (65) is provided with an air passage, one end of which is connected to the vacuum suction hole; the air nozzle (66) is set on the side of the capped block (65) and connected to the other end of the air passage for vacuum pumping, so as to adsorb the cap body (03) in the groove (B) through vacuum negative pressure; the inner side of the groove (B) is provided with a clearance groove (C), so that when the cap is on, the tab (02) passes through the cap body (03) and extends into the clearance groove (C).
7. A cell platform applied to the segmented capping process of lithium battery cells as described in claim 1, characterized in that: Includes a platform support (11), a load-bearing suction seat (12), a guide and limiting seat (13), a piezoelectric core assembly, and a side pressure assembly (18), wherein, The platform support (11) is set horizontally; The bearing suction seat (12) is horizontally set on the platform support (11). At least two vacuum suction holes are arranged on the bearing suction seat (12). The battery cell body (01) to be assembled is horizontally set on the bearing suction seat (12) and is fixed by vacuum negative pressure generated by the vacuum suction holes. The platform support (11) has a through groove (E) that runs vertically through it. The guide limit seat (13) is located at the edge of the platform support (11) and on one side of the through groove (E). The guide limit seat (13) is provided with an arc-shaped limit bearing groove (D). The piezoelectric core assembly is disposed below the platform support (11) and extends above the platform support (11) to press the core body (01) from above. The side pressure assembly (18) is located below the platform support (11) and extends upward, and is used to press and fix it onto the cap (03) of the cell body (01) from above and the side.
8. The cell platform for a segmented capped process of lithium battery cells according to claim 7, characterized in that: The piezoelectric cell assembly includes a pressing cylinder (14), a pressing shaft (15), a pressing block (16), and a guide roller (17). The pressing cylinder (14) is located below the platform support (11) with its output end facing upward. The pressing shaft (15) is vertically connected to the output end of the pressing cylinder (14) and extends upward through the platform support (11). The pressing block (16) is horizontally located on top of the pressing shaft (15), with one end of the pressing block (16) extending horizontally above the cell body (01). The guide roller (17) is located at the other end of the pressing block (16) and extends into the limiting bearing groove (D) of the guide limiting seat (13). The pressing cylinder (14) drives the pressing block (16) to move up and down through the pressing shaft (15) to press it flat on the cell body (01) from above, and slides in the limiting bearing groove (D) through the guide roller (17) for guiding and limiting.
9. The cell platform for a segmented capped process of lithium battery cells according to claim 7, characterized in that: The side pressure assembly (18) includes a support block (181), a first slider (182), a first cylinder (183), a second slider (184), a second cylinder (185), a lower pressure plate (186), a first spring (187), and a second spring (188). The support block (181) is horizontally positioned at the bottom of the platform support (11), and one side edge of the support block (181) has a support portion extending downwards perpendicular to the support block (181). The first slider (182) has an L-shaped block structure, and one side plate of the first slider (182) is slidably connected to the support block (181). On the side wall of the first slider (182); the first cylinder (183) is mounted on the first slider (182), and the output end of the first cylinder (183) passes through the first slider (182) and pushes against the support. When the first cylinder (183) outputs power, its output end pushes against the support. The reaction force of the support pushes the first cylinder (183) and the first slider (182) to slide on the support block (181); the second slider (184) is slidably mounted on the other side plate of the first slider (182). One side of the second slider (184) first extends upward through the through groove (E) and then extends horizontally to the battery cell. Above the electrode tab of body (01); the second cylinder (185) is disposed on the second slider (184), the second cylinder (185) outputs power in a direction perpendicular to the first cylinder (183), the output end of the second cylinder (185) passes through the second slider (184) and pushes against the first slider (182), the output power of the second cylinder (185) pushes against the first slider (182), the reaction force of the first slider (182) pushes the second slider (184) to move linearly; the lower pressure plate (186) is disposed at the part where the second slider (184) extends horizontally to the top of the electrode tab, the lower pressure plate (186) Move with the second slider (184) to press down on the shaping tab from above; the two ends of the first spring (187) are respectively connected to the first slider (182) and the support block (181). In the natural state, the elastic force of the first spring (187) pulls the first slider (182) in the opposite direction to the first cylinder (183); the two ends of the second spring (188) are respectively connected to the second slider (184) and the first slider (182). In the natural state, the elastic force of the second spring (188) pulls the second slider (184) in the opposite direction to the second cylinder (185).
Citation Information
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