Positioning and guiding fuel cell stack module and method for manufacturing the same

Abstract

The application discloses a positioning and guiding fuel cell stack module and a preparation method thereof, relates to the technical field of fuel cells, and comprises a battery monomer series layer and a tightening assembly, a top fixing plate is arranged on the top of the battery monomer series layer, and positioning and guiding grooves are arranged on the two sides of the top fixing plate and a bottom fixing plate. The positioning and guiding fuel cell stack module and the preparation method thereof have the adjustable winding characteristics of the winding shaft on the steel band, can flexibly wind the excess steel band according to the battery monomer series layer, the top fixing plate and the bottom fixing plate with different sizes, realize tight tightening, do not need to customize bolts with different lengths, greatly reduce the customization cost caused by specification adaptation, reduce the complexity of bolt inventory management, after winding is stopped, the spring toothed pieces are clamped into the one-way gear tooth grooves, the rotation of the winding shaft is forced to be limited, the steel band is ensured to always keep a tight state, and the stability of the stack structure is ensured.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, specifically to a positioning-guided fuel cell stack module and its fabrication method. Background Technology

[0002] The fuel cell stack module is composed of multiple fuel cell cells stacked in series. Specifically, bipolar plates and membrane electrode assemblies (MEAs) are stacked alternately, with seals embedded between each cell. Fixing plates are set at the top and bottom, and the fixing plates are tightened by bolts or steel strips welded together.

[0003] When existing fuel cell stack modules are fastened with bolts or bound together with steel strips, the former requires custom production of bolt lengths based on the overall specifications of the fuel cell stack module. Custom production of bolt lengths increases costs. For example, a 50kW stack requires bolts with a length of 150mm-200mm, a 100kW stack requires 250mm-300mm, and a 200kW stack requires 400mm-500mm. Each bolt specification requires a separately developed mold and high processing precision (thread precision must reach IT8 level). On the other hand, using steel strips for binding and welding is very inconvenient for disassembly when the battery needs to be inspected and maintained later. The welded steel strips cannot be reused, and they need to be cut with an angle grinder during disassembly. The disassembly time for a single stack is long, and the stack shell or internal components are easily scratched during the cutting process, leading to an increased stack scrap rate. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a positioning-guided fuel cell stack module and its fabrication method, thus solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a positioning-guided fuel cell stack module, comprising a series layer of battery cells and a bundling assembly. A top fixing plate is provided at the top of the series layer of battery cells, and a bottom fixing plate is provided at the bottom of the series layer of battery cells. Positioning guide grooves are provided on both sides of the top and bottom fixing plates. The bundling assembly includes a steel strip passing through the positioning guide groove, with a bearing plate fixed to one end of the steel strip. A through hole is provided at the bottom of the surface of the bearing plate. A first bracket and a second bracket are fixed to both sides of the surface of the bearing plate, respectively. A winding shaft is rotatably connected to the middle of the side of the first bracket, and a cross-groove end is fixed to the end of the winding shaft. A transition guide ring passes through the interior of the second bracket, and a one-way gear is fixed to one side of the transition guide ring. A turntable is fixed to the outer wall of the cross-groove end, and a groove is provided on the side of the turntable. A spring tooth is provided inside the groove.

[0006] Furthermore, the end of the steel strip away from the bearing plate passes through the through hole, and the end of the steel strip away from the bearing plate is engaged with the surface of the winding shaft.

[0007] Furthermore, the turntable is connected to a one-way gear via a spring-loaded toothed plate, and the winding shaft can only rotate in one direction via the turntable, the spring-loaded toothed plate, and the one-way gear.

[0008] Furthermore, the inner surface of the transition guide ring is sloping, that is, it bulges out in the middle and slopes down smoothly to both sides.

[0009] Furthermore, the slope of the transition guide ring is provided with a guide groove, and the end of the guide groove is aligned with the tooth groove of the one-way gear.

[0010] Furthermore, a splitting assembly is fixed to the side of the first bracket, and the splitting assembly includes a tube body.

[0011] Furthermore, a spring rod is inserted inside the tube, and one end of the spring rod is fixedly connected to a one-way gear.

[0012] Furthermore, the one-way gear is slidably connected to the second bracket via a transition guide ring, and the one-way gear and the transition guide ring are elastically connected to the tube body via a spring rod.

[0013] Furthermore, a lever is fixed to the end of the spring rod away from the one-way gear, and the lever is arranged parallel to the outside of the first bracket.

[0014] A preparation method for use in a positioning-guided fuel cell stack module as described above, the preparation method comprising the following steps: Step 1: The steel strip is made into a strip structure with a width of 20-40mm using a stamping process, and the surface is galvanized for rust prevention; the winding shaft is machined into a cylindrical structure with a shoulder by a turning process, and the shaft body has a groove to fit the end of the steel strip; the levers and spring rods of the splitting and engaging components are made by injection molding and machining, and the one-way gear and turntable are formed by powder metallurgy and machining. Step 2: Machining positioning guide grooves on both sides of the top and bottom fixing plates. After stacking the battery cell series layer, the top fixing plate, and the bottom fixing plate, the steel strip is sequentially passed through the positioning guide grooves of the bottom and top fixing plates to ensure that the steel strip fits snugly in the positioning guide grooves of each layer. This allows one end of the steel strip to pass through a through hole on the surface of the bearing plate at the other end and then engage with the surface of the winding shaft. Then, use an electric drill to insert the drill bit into the cross groove end, and use the electric drill to drive the cross groove end to rotate so that the winding shaft can wind up the excess steel strip, so that the steel strip is continuously tightened inside the positioning guide groove to bind the stacked battery cell series layer, top fixing plate and bottom fixing plate tightly. Step 3: After the cross groove ends stop rotating, the tension and pull of the steel strip will cause the take-up shaft to rotate. At this time, the spring tooth will be stuck inside the tooth groove under the rotation, thus preventing the take-up shaft from rotating and preventing the steel strip from loosening.

[0015] This invention provides a positioning-guided fuel cell stack module and its fabrication method, which has the following beneficial effects: 1. This positioning-guided fuel cell stack module and its fabrication method utilize the adjustable winding characteristics of the steel strip on the winding shaft. It can flexibly wind up excess steel strip to achieve tight binding according to different sizes of battery cell series layers, top fixing plates, and bottom fixing plates, eliminating the need for customized bolts of different lengths. This significantly reduces customization costs due to specification adaptation and simplifies bolt inventory management. Furthermore, to prevent loosening due to pull-back force after the steel strip is tightened, when the winding shaft drives the turntable to rotate, the spring-loaded teeth slide along the one-way gear groove under elastic action, allowing the winding shaft to wind in one direction. After winding stops, the tension pull-back force of the steel strip will cause the winding shaft to tend to rotate. At this time, the spring-loaded teeth will engage with the one-way gear groove, forcibly restricting the rotation of the winding shaft, ensuring that the steel strip remains taut at all times. This prevents stack displacement caused by loose steel strips under bumpy conditions and ensures the structural stability of the fuel cell stack.

[0016] 2. The positioning-guided fuel cell stack module and its fabrication method address the misalignment issue between the spring tooth and the unidirectional gear tooth groove during reset of the unidirectional locking structure. A guide groove on the inner wall of the transition guide ring is precisely aligned with the tooth groove of the unidirectional gear. During reset, the spring tooth slides along the guide groove under its own elasticity, automatically engaging with the unidirectional gear tooth groove without manual calibration. This ensures reliable engagement of the unidirectional locking structure after each reset, preventing locking failure due to reset misalignment, improving the long-term reliability of the component, and facilitating disassembly of the fuel cell stack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a positioning-guided fuel cell stack module of the present invention after being bundled with steel straps; Figure 2 This is a schematic diagram of the unbuckled structure of a positioning-guided fuel cell stack module according to the present invention; Figure 3 This is a schematic diagram of the steel strip structure of a positioning-guided fuel cell stack module according to the present invention; Figure 4 This is a schematic diagram of the support plate structure of a positioning-guided fuel cell stack module according to the present invention; Figure 5 This is a schematic diagram of the winding shaft structure of a positioning-guided fuel cell stack module according to the present invention; Figure 6This is a schematic diagram of the transition guide ring structure of a positioning-guided fuel cell stack module according to the present invention; Figure 7 This is a schematic diagram of the turntable structure of a positioning-guided fuel cell stack module according to the present invention.

[0018] In the diagram: 1. Battery cell series layer; 2. Top fixing plate; 3. Bottom fixing plate; 4. Positioning guide groove; 5. Bundling assembly; 501. Steel strip; 502. Bearing plate; 503. Through hole; 504. First bracket; 505. Second bracket; 506. Rewinding shaft; 507. Cross groove end; 508. Transition guide ring; 509. One-way gear; 510. Turntable; 511. Groove; 512. Spring toothed plate; 6. Splitting assembly; 601. Tube body; 602. Spring rod; 603. Paddle. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] like Figures 1-7 As shown, the present invention provides a technical solution: a positioning-guided fuel cell stack module, comprising a battery cell series layer 1 and a bundling assembly 5. A top fixing plate 2 is provided at the top of the battery cell series layer 1, and a bottom fixing plate 3 is provided at the bottom of the battery cell series layer 1. Positioning guide grooves 4 are provided on both sides of the top fixing plate 2 and the bottom fixing plate 3. The bundling assembly 5 includes a steel strip 501 passing through the positioning guide grooves 4, and a bearing plate 502 is fixed to one end of the steel strip 501. A through hole 503 is provided at the bottom of the surface of the bearing plate 502. A first bracket 504 and a second bracket 505 are respectively fixed to both sides of the surface of the bearing plate 502. A winding shaft 506 is rotatably connected to the middle of the side of the first bracket 504, and a cross-groove end 507 is fixed to the end of the winding shaft 506. A transition guide ring 50 is passed through the interior of the second bracket 505. 8. A one-way gear 509 is fixed on one side of the transition guide ring 508. A turntable 510 is fixed on the outer wall of the cross groove end 507. A groove 511 is provided on the side of the turntable 510. A spring tooth 512 is provided inside the groove 511. The end of the steel strip 501 away from the bearing plate 502 passes through the through hole 503. The end of the steel strip 501 away from the bearing plate 502 is engaged with the surface of the take-up shaft 506. The turntable 510 is engaged with the one-way gear 509 through the spring tooth 512. The take-up shaft 506 can only rotate in one direction through the turntable 510, the spring tooth 512 and the one-way gear 509. The inner side of the transition guide ring 508 is sloping, that is, it protrudes in the middle and slopes down smoothly to both sides. A guide groove is provided on the slope of the transition guide ring 508. The end of the guide groove is aligned with the tooth groove of the one-way gear 509. The specific operation is as follows: the battery cell series layer 1 is composed of several fuel cell cells stacked in series. The top and bottom fixing plates 2 and 3 are stacked on the top and bottom respectively. After the stacking is completed, the steel strip 501 passes through the positioning guide grooves 4 on both sides of the top fixing plate 2 and the bottom fixing plate 3, so that one end of the steel strip 501 passes through the through hole 503 on the surface of the bearing plate 502 at the other end and is engaged with the surface of the winding shaft 506. The top fixing plate 2 and the bottom fixing plate 3 are the bearing frame of the stack, used to distribute the stacking pressure to protect the battery cell series layer 1. Then, an electric drill is used to connect the drill bit to the cross-shaped groove end 507. The electric drill drives the cross-shaped groove end 507 to rotate, causing the winding shaft 506 to wind up the excess steel strip 501. This causes the steel strip 501 to continuously tighten inside the positioning guide groove 4, thereby binding the stacked battery cell series layer 1, top fixing plate 2, and bottom fixing plate 3 tightly. This adapts to fuel cell stack modules of different specifications and sizes. The steel strip 501 is made of Q235 or 65Mn spring steel, with a thickness of 1mm-2mm, a width of 20mm-40mm (selected according to the circumference of the stack to ensure that a single wrap can cover the side of the stack), and a length designed according to the size of the stack, usually 1m-3m. When the electric drill drives the cross-groove end 507 to rotate, its rotation direction is the rotation direction allowed by the one-way gear 509. When the cross-groove end 507 rotates, the turntable 510 carries the spring tooth 512 to rotate together. Under the action of elasticity, the spring tooth 512 continuously passes through the tooth groove positions of the one-way gear 509. After the cross-groove end 507 stops rotating, the tension and pull of the steel belt 501 will cause the winding shaft 506 to rotate. At this time, the spring tooth 512 will be stuck in the tooth groove under the action of rotation, so that the winding shaft 506 cannot rotate, thereby preventing the steel belt 501 from loosening. The number of spring teeth 512 can be more than one. Based on the above description, this invention utilizes the adjustable winding characteristics of the take-up shaft 506 on the steel strip 501. It can flexibly wind up excess steel strip 501 to achieve tight binding according to different sizes of battery cell series layers 1, top fixing plate 2, and bottom fixing plate 3, eliminating the need for custom-made bolts of different lengths. This significantly reduces customization costs associated with specification matching and also reduces the complexity of bolt inventory management. Furthermore, to prevent the steel strip 501 from loosening due to pull-back force after binding, the take-up shaft 506 drives the turntable 510 to rotate. When in motion, the spring tooth 512 slides along the tooth groove of the one-way gear 509 under elastic action, allowing the winding shaft 506 to wind in one direction. After winding stops, the tension and pull-back force of the steel strip 501 will cause the winding shaft 506 to have a tendency to rotate. At this time, the spring tooth 512 will engage with the tooth groove of the one-way gear 509, forcibly restricting the rotation of the winding shaft 506, ensuring that the steel strip 501 always remains taut, and preventing the stack from shifting due to the loosening of the steel strip 501 under bumpy or other working conditions, thus ensuring the structural stability of the stack.

[0021] like Figures 1-7 As shown, a splitting assembly 6 is fixed to the side of the first bracket 504, and the splitting assembly 6 includes a tube body 601. A spring rod 602 is inserted inside the tube body 601, and one end of the spring rod 602 is fixedly connected to a one-way gear 509. The one-way gear 509 is slidably connected to the second bracket 505 through a transition guide ring 508. The one-way gear 509 and the transition guide ring 508 are elastically connected to the tube body 601 through the spring rod 602. A paddle 603 is fixed to the end of the spring rod 602 away from the one-way gear 509, and the paddle 603 is arranged parallel to the outside of the first bracket 504. The specific operation is as follows: When it is necessary to disassemble the fuel cell stack module, simply pull the lever 603 to make the spring rod 602 move along the inside of the tube 601. At this time, the one-way gear 509 and the transition guide ring 508 slide, so that the spring tooth 512 separates from the one-way gear 509 and enters the interior of the transition guide ring 508. Because the spring tooth 512 separates from the one-way gear 509, the locking effect on the winding shaft 506 is lost. At this time, the winding shaft 506 can rotate to release the steel strip 501, thereby loosening the steel strip 501, making it easy to remove the steel strip 501 from the inside of the positioning guide groove 4, thus facilitating the disassembly of the fuel cell stack module. When the one-way gear 509 needs to be reset, simply release the lever 603. At this time, the one-way gear 509 and the transition guide ring 508 will slide in opposite directions to reset. During the reset process, the spring tooth 512 will be guided by the guide groove on the inner wall slope of the transition guide ring 508 under its own elasticity and will be accurately reset into the tooth groove of the one-way gear 509, so that the spring tooth 512 can re-mesh with the one-way gear 509. Based on the above description, in order to solve the problem of misalignment between the spring tooth 512 and the tooth groove of the one-way gear 509 when the one-way locking structure is reset, the present invention precisely aligns the end of the guide groove opened on the inner wall of the transition guide ring 508 with the tooth groove of the one-way gear 509: when resetting, the spring tooth 512 slides along the guide groove under its own elasticity and can automatically engage with the tooth groove of the one-way gear 509 without manual calibration, ensuring that the one-way locking structure can reliably engage after each reset, avoiding locking failure caused by reset misalignment, improving the long-term reliability of the component, and facilitating the disassembly of the fuel cell stack.

[0022] A preparation method for use in a positioning-guided fuel cell stack module, comprising the following steps: Step 1: Steel strip 501 is manufactured into a strip structure with a width of 20-40mm using a stamping process, and the surface is galvanized for rust prevention. Specifically: Q235 steel coil conforming to GB / T3274 standard is selected, with a thickness of 1mm-2mm and a width of 21mm-41mm (1mm wider than the finished product, leaving a stamping allowance). The length is cut according to the fuel cell stack specifications (e.g., 2m-2.5m for a 100kW fuel cell stack). A continuous stamping press is used, with the stamping die clearance set to 5%-10% of the thickness of the 501 steel strip (e.g., 0.08mm for a 1.5mm thick strip). The stamping speed is 30-50 times / minute to ensure that the edges of the 501 steel strip are burr-free (burr height ≤0.05mm). After stamping, stress-relief annealing is performed at a temperature of 600℃-650℃ for 1-2 hours, followed by furnace cooling to room temperature to eliminate internal stamping stress and prevent deformation during use. The winding shaft 506 is machined into a cylindrical structure with a shoulder by turning process, and the shaft body has a groove adapted to the end of the steel strip 501; the paddle 603 and spring rod 602 of the splitting and connecting assembly 6 are made by injection molding and machining, and the one-way gear 509 and turntable 510 are formed by powder metallurgy and machining. Step 2: Machining positioning guide grooves 4 on both sides of the top fixing plate 2 and the bottom fixing plate 3. After stacking the battery cell series layer 1, the top fixing plate 2, and the bottom fixing plate 3, the steel strip 501 is sequentially passed through the positioning guide grooves 4 of the bottom fixing plate 3 and the top fixing plate 2 to ensure that the steel strip 501 fits in the positioning guide grooves 4 of each layer without jamming. This allows one end of the steel strip 501 to pass through the through hole 503 on the surface of the bearing plate 502 at the other end and then engage with the surface of the winding shaft 506. Then, the drill bit is inserted into the cross groove end 507 by using an electric drill. The drill drives the cross groove end 507 to rotate, so that the winding shaft 506 winds up the excess steel strip 501, so that the steel strip 501 is continuously tightened inside the positioning guide groove 4 to bind the stacked battery cell series layer 1, top fixing plate 2, and bottom fixing plate 3. Step 3: After the cross groove end 507 stops rotating, the winding shaft 506 will rotate due to the tension and pull of the steel strip 501. At this time, the spring tooth 512 will be stuck in the tooth groove under the rotation, so that the winding shaft 506 cannot rotate, thereby preventing the steel strip 501 from loosening.

[0023] In summary, the positioning-guided fuel cell stack module and its preparation method are used in the following way: First, the battery cell series layer 1 is composed of several fuel cell cells stacked in series. A top fixing plate 2 and a bottom fixing plate 3 are stacked on its top and bottom sides, respectively. After stacking, the steel strip 501 passes through the positioning guide grooves 4 on both sides of the top fixing plate 2 and the bottom fixing plate 3, so that one end of the steel strip 501 passes through the through hole 503 on the surface of the bearing plate 502 at its other end and is engaged with the surface of the winding shaft 506. Then, an electric drill is used to insert the drill bit into the cross groove end 507. The electric drill drives the cross groove end 507 to rotate, causing the winding shaft 506 to wind up the excess steel strip 501. The steel strip 501 is continuously tightened inside the positioning guide groove 4 to bind the stacked battery cell series layer 1, top fixing plate 2, and bottom fixing plate 3, thereby adapting to fuel cell stack modules of different specifications and sizes. When the electric drill drives the cross-groove end 507 to rotate, its rotation direction is the rotation direction allowed by the one-way gear 509. When the cross-groove end 507 rotates, the turntable 510 carries the spring tooth 512 to rotate together. Under the action of elasticity, the spring tooth 512 continuously passes through the tooth groove positions of the one-way gear 509. After the cross-groove end 507 stops rotating, the tension and pull of the steel belt 501 will cause the winding shaft 506 to rotate. At this time, the spring tooth 512 will be stuck in the tooth groove under the action of rotation, so that the winding shaft 506 cannot rotate, thereby preventing the steel belt 501 from loosening. When it is necessary to disassemble the fuel cell stack module, simply pull the lever 603 to make the spring rod 602 translate along the inside of the tube 601. At this time, the one-way gear 509 and the transition guide ring 508 translate and slide, so that the spring tooth 512 separates from the one-way gear 509 and enters the interior of the transition guide ring 508. Because the spring tooth 512 separates from the one-way gear 509, the locking effect on the winding shaft 506 is lost. At this time, the winding shaft 506 can rotate to release the steel strip 501, thereby loosening the steel strip 501, making it easy to remove the steel strip 501 from the positioning guide groove 4, thus facilitating the disassembly of the fuel cell stack module. When the one-way gear 509 needs to be reset, simply release the lever 603. At this time, the one-way gear 509 and the transition guide ring 508 will slide in opposite directions to reset. During the reset process, the spring tooth 512 will be guided by the guide groove on the inner wall slope of the transition guide ring 508 under its own elasticity and will be accurately reset into the tooth groove of the one-way gear 509, so that the spring tooth 512 can re-mesh with the one-way gear 509.

[0024] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A positioning-guided fuel cell stack module, comprising a series layer of individual cells (1) and a bundling assembly (5), characterized in that: The top of the battery cell series layer (1) is provided with a top fixing plate (2), and the bottom of the battery cell series layer (1) is provided with a bottom fixing plate (3). The top fixing plate (2) and the bottom fixing plate (3) are provided with positioning guide grooves (4) on both sides. The binding assembly (5) includes a steel strip (501) passing through the positioning guide groove (4), and a bearing plate (502) is fixed at one end of the steel strip (501). A through hole (503) is provided at the bottom of the surface of the bearing plate (502). A first bracket (504) and a second bracket (505) are fixed on both sides of the surface of the bearing plate (502). A winding shaft (506) is rotatably connected to the middle of the side of the first bracket (504). A cross groove end (507) is fixed at the end of the winding shaft (506). A transition guide ring (508) passes through the inside of the second bracket (505), and a one-way gear (507) is fixed on one side of the transition guide ring (508). 09), a turntable (510) is fixed to the outer wall of the cross groove end (507), and a groove (511) is provided on the side of the turntable (510). A spring tooth (512) is provided inside the groove (511). A splitting assembly (6) is fixed to the side of the first bracket (504), and the splitting assembly (6) includes a tube (601). A spring rod (602) is passed through the inside of the tube (601), and one end of the spring rod (602) is... The one-way gear (509) is fixedly connected to the one-way gear (509), which is slidably connected to the second bracket (505) through the transition guide ring (508). The one-way gear (509) and the transition guide ring (508) are elastically connected to the tube body (601) through the spring rod (602). A paddle (603) is fixed at one end of the spring rod (602) away from the one-way gear (509), and the paddle (603) is arranged parallel to the outside of the first bracket (504).

2. The positioning-guided fuel cell stack module according to claim 1, characterized in that: The end of the steel strip (501) away from the bearing plate (502) passes through the through hole (503), and the end of the steel strip (501) away from the bearing plate (502) is engaged with the surface of the winding shaft (506).

3. A positioning-guided fuel cell stack module according to claim 2, characterized in that: The turntable (510) is connected to the one-way gear (509) by the spring tooth plate (512), and the winding shaft (506) can only rotate in one direction through the turntable (510), the spring tooth plate (512) and the one-way gear (509).

4. A positioning-guided fuel cell stack module according to claim 3, characterized in that: The inner surface of the transition guide ring (508) is sloping, that is, it bulges out in the middle and slopes down smoothly to both sides.

5. A positioning-guided fuel cell stack module according to claim 4, characterized in that: The transition guide ring (508) has a guide groove on its slope, and the end of the guide groove is aligned with the tooth groove of the one-way gear (509).

6. A preparation method, applied to a positioning-guided fuel cell stack module as described in claim 5, characterized in that: The preparation method includes the following steps: Step 1: The steel strip (501) is made into a strip structure with a width of 20-40mm by stamping process, and the surface is galvanized for rust prevention; the winding shaft (506) is machined into a cylindrical structure with a shoulder by turning process, and the shaft body is opened with a groove that matches the end of the steel strip (501); the paddle (603) and spring rod (602) of the splitting assembly (6) are made by injection molding and machining, and the one-way gear (509) and turntable (510) are formed by powder metallurgy and machining; Step 2: Machining positioning guide grooves (4) on both sides of the top fixing plate (2) and the bottom fixing plate (3). After stacking the battery cell series layer (1), the top fixing plate (2) and the bottom fixing plate (3), the steel strip (501) is sequentially passed through the positioning guide grooves (4) of the bottom fixing plate (3) and the top fixing plate (2) to ensure that the steel strip (501) fits in the positioning guide grooves (4) of each layer without jamming. This allows one end of the steel strip (501) to pass through the through hole (503) on the surface of the bearing plate (502) at the other end and then engage with the surface of the winding shaft (506); Then, the drill bit is inserted into the cross groove end (507) by the electric drill. The cross groove end (507) is rotated by the electric drill so that the winding shaft (506) winds up the excess steel strip (501). The steel strip (501) is continuously tightened inside the positioning guide groove (4) to bind the stacked battery cell series layer (1), top fixing plate (2), and bottom fixing plate (3). Step 3: After the cross groove end (507) stops rotating, the winding shaft (506) will rotate under the tensioning and pulling action of the steel strip (501). At this time, the spring tooth (512) will be stuck in the tooth groove under the rotation action, so that the winding shaft (506) cannot rotate, thereby preventing the steel strip (501) from loosening.

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