New energy power battery heating wire resistance testing device and heating wire thereof

Abstract

The invention discloses a new energy power battery heating wire resistance testing device and a heating wire thereof, and relates to the technical field of resistance detection, and the new energy power battery heating wire resistance testing device comprises a bottom plate, a resistance detection device, a transmission device, a shaping device and a heating wire; according to the invention, the push plate pushes the turning block to drive the transmission plate to rotate, and the guide effect of the slope surface structure of the transmission groove is utilized to drive the shaping rod to move radially, so that the heating wire can be shaped, and the stress uniformity and the current conduction stability of the heating wire during detection are effectively ensured; the technical problem of large detection data deviation caused by irregular shape of the heating wire in traditional detection is solved, and the accuracy and the reliability of a resistance detection result are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of resistance detection technology, and in particular to a device for testing the resistance of a heating wire in a new energy power battery and the heating wire thereof. Background Technology

[0002] With the development and promotion of new energy technologies, new energy electric vehicles are becoming increasingly popular, highlighting the growing importance of battery pack thermal management systems. Directly charging batteries in low-temperature environments can damage battery performance and even cause irreversible damage. Currently, the industry generally uses heating films to preheat the battery cells before starting the charging process to ensure battery charging performance, energy conversion efficiency, and safety. However, heating films have drawbacks such as high manufacturing costs and large space requirements in the module layout, which contradicts the lightweight design concept of new energy vehicles.

[0003] To address this, a heating wire product has been developed, which is installed on the T-strip or current collector of the battery module to heat the battery cells. This solution can significantly reduce manufacturing costs, optimize module layout, and meet the requirements of lightweight design.

[0004] Resistance testing is required before the heating wire leaves the factory. Its core functions are twofold: first, to determine the heating wire's conductivity, using measured resistance values ​​to identify inherent faults such as open circuits and short circuits; and second, to ensure the accuracy of heating power and temperature control, relying on stable resistance values ​​to ensure the heating wire's output power meets design requirements and maintains consistency in heating process parameters. However, the heating wire is flexible and prone to irregular excessive bending during testing, causing changes in the equivalent conduction length and microstructural deformation. This results in inconsistent resistance values ​​for each heating wire, leading to poor repeatability and affecting the accuracy of the resistance test results. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention provides a heating wire resistance testing device and its heating wire for new energy power batteries. During the heating wire resistance test, the heating wire is shaped to ensure that each heating wire has a uniform shape, thereby avoiding changes in the equivalent conduction length and microstructure deformation caused by irregular bending of the heating wire, and ensuring the accuracy and consistency of the resistance test results.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A resistance testing device for heating wires in new energy power batteries includes a base plate, a resistance detection device, a transmission device, and a shaping device. The resistance detection device is fixed on the base plate. The transmission device drives the shaping device to reciprocate. The shaping device moves in two modes: linearly along the W direction to stretch and shape the heating wire; and rotating along the E direction to fold the heating wire. A push plate is mounted above the base plate.

[0008] The shaping device includes: a support column, an assembly plate, a transmission plate, shaping rods, and a flipping block; the middle part of the assembly plate is rotatably connected to the support column via a rotating shaft, the support column limits the rotating shaft and is slidably connected to the base plate, the assembly plate is fixedly provided with a folding rod, and the assembly plate has multiple radially distributed strip grooves; the transmission plate is rotatably connected to the assembly plate, and a torsion spring is provided at the connection point, the transmission plate has multiple transmission grooves arranged one-to-one with the strip grooves, and the two are set at a set inclination angle; the ends of the multiple shaping rods are respectively nested in the strip grooves and transmission grooves; the flipping block fixes the axis of the transmission plate.

[0009] In one embodiment, a slide rail is provided on the top surface of the base plate. The slide rail is connected to the transmission device and the shaping device through a slider. A slide groove is provided on the slide rail. The length of both the slide rail and the slide groove is greater than the length of the heating wire. A connecting plate is fixedly connected to the side of one end of the slide rail. The push plate is located at the end of the stroke of the shaping device moving in the W direction.

[0010] In one embodiment, the resistance detection device includes a detection body, a clamping shell, a cylinder, and contacts. The detection body has current output and current receiving functions, and can calculate the resistance value of the heating wire based on the parameters of the output current and the received current using Ohm's law, and simultaneously display the calculated resistance value visually. The two clamping shells are arranged opposite each other for clamping and positioning the conductive plug. One clamping shell is fixedly installed, and the other clamping shell is connected to the output end of the cylinder and driven by the cylinder to achieve a reciprocating sliding action. The two contacts are located inside the two clamping shells and are electrically connected to the detection body.

[0011] In one embodiment, an extension plate is integrally formed on the lower side of the other end of the assembly plate. The extension plate can fit against the overlapping plate to limit the rotation stroke of the assembly plate. A counterweight is installed on the upper side of the other end of the assembly plate.

[0012] In one embodiment, a spline is fixedly provided at the end of the rotating shaft, and a protrusion is provided on one side of each of the multiple grooves of the spline. The side of the protrusion in the clockwise direction is a vertical surface, and the side in the counterclockwise direction is a slope surface. The lower end of the support column is fixedly connected to the slider, and a plurality of locking plates are slidably provided at the upper end of the support column. An elastic element is provided at the sliding connection between the support column and the locking plates. The plurality of locking plates are arranged in a ring along the axis of the rotating shaft. The plurality of locking plates are respectively inserted into the multiple grooves of the spline. A push plate is fixedly provided on the end face of the locking plate. The length of the push plate is smaller than the length of the locking plate, and the opposite end faces of the plurality of push plates are all set as arc surfaces.

[0013] In one embodiment, the transmission device includes: a servo motor, a roller, a second rotating shaft, a chain, and a cam; the servo motor is fixedly mounted on the slider, and a first sprocket is fixedly mounted on the transmission shaft of the servo motor; the second rotating shaft and the first rotating shaft are aligned on the same straight line; a second sprocket is fixedly mounted on the second rotating shaft, and the diameter of the second sprocket is larger than the diameter of the first sprocket; both ends of the chain are respectively fitted onto the first sprocket and the second sprocket; the cam is coaxially slidably fitted onto the second rotating shaft, the number of protrusions of the cam is consistent with the number of protrusions of the spline, the end face of the cam is in contact with the end face of the spline, and a spring is provided between the cam and the second sprocket; the roller is engaged in a groove, and an arc-shaped groove is opened at the hub of the roller, and the transmission shaft drives the roller through a protrusion.

[0014] In one embodiment, the time taken for the drive shaft to move the protrusion from one end of the arc-shaped groove to the other end is greater than the time taken for the protrusion of the cam to abut against the vertical surface of the protrusion.

[0015] The present invention also aims to provide a heating wire for a new energy power battery, comprising a heating wire and a conductive plug. The heating wire is provided with glass fiber, metal wire and insulating layer arranged sequentially from the inside to the outside. The metal wire is spirally wound around the outer peripheral wall of the glass fiber with the same spiral pitch. The insulating layer forms a fully enclosed protective structure for the glass fiber and the metal wire.

[0016] In one embodiment, the two ends of the heating wire are respectively firmly connected to the conductive plug, so that the heating wire as a whole forms a closed ring structure, and an external power supply circuit can be connected through the conductive plug.

[0017] The beneficial effects of this invention are as follows:

[0018] (1) The present invention drives the transmission plate to rotate by pushing the push plate against the push-rotating block, and drives the shaping rod to move radially by using the guiding effect of the transmission groove slope structure. This can shape the heating wire, effectively ensuring the uniformity of the force on the heating wire and the stability of the current conduction during the test. It solves the technical problem of large deviation of the test data caused by the irregular shape of the heating wire in traditional tests, and greatly improves the accuracy and reliability of the resistance test results.

[0019] (2) The present invention uses a torsion spring to drive the transmission plate to rotate in the opposite direction to gather the shaping rod, and then the shaping device moves to straighten the heating wire to ensure that the folded raw materials are neat and uniform; at the same time, the servo motor reverses to drive the cam and the protrusion to work together, and the folding rhythm and angle are controlled by the design of the sprocket diameter difference; the whole process is highly automated, reduces the labor intensity, and improves the convenience of heating wire storage and transportation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the heating wire of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the heating wire of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of the resistance detection device of the present invention;

[0023] Figure 4 This is a front view schematic diagram of the resistance detection device of the present invention;

[0024] Figure 5 This is a schematic diagram of the resistance detection device of the present invention;

[0025] Figure 6 This is a partial structural diagram of the resistance detection device of the present invention;

[0026] Figure 7 This is a schematic diagram of the shaping device and transmission device of the present invention;

[0027] Figure 8 This is an exploded structural diagram of the shaping device of the present invention;

[0028] Figure 9 This is a schematic diagram of the assembly plate structure of the present invention;

[0029] Figure 10 This is a schematic diagram of the transmission plate structure of the present invention;

[0030] Figure 11 This is a schematic diagram of the spline and support column connection of the present invention;

[0031] Figure 12 This is a partial structural diagram of the transmission device of the present invention;

[0032] Figure 13 This is a schematic diagram of the spline and cam connection of the present invention;

[0033] Figure 14 This is a schematic diagram showing the connection between the roller and the drive shaft of the present invention;

[0034] Figure 15 This is a schematic diagram of the heating wire shaping and testing process according to the present invention;

[0035] Figure 16 This is a schematic diagram of the pre-folding of the straightened heating wire according to the present invention;

[0036] Figure 17 This is a schematic diagram of the rotation of the transmission plate of the present invention;

[0037] Figure 18 This is a schematic diagram of the folding rod and the shaping rod folding the heating wire together according to the present invention;

[0038] Figure 19 This is a schematic diagram of the cam rotating clockwise according to the present invention;

[0039] Figure 20 This is a schematic diagram of the cam rotating counterclockwise according to the present invention.

[0040] In the diagram: 100, heating wire; 200, conductive plug; 101, fiberglass; 102, metal wire; 103, insulating layer; 1, base plate; 11, slide rail; 111, slider; 12, slide groove; 13, overlapping plate; 14, push plate; 141, crossbeam; 2, resistance detection device; 21, detection body; 22, clamping shell; 23, cylinder; 24, contact point; 20, support plate; 3, transmission device; 31, servo motor; 312, transmission shaft; 313, sprocket one; 314, protrusion; 32, roller; 32 1. Arc-shaped groove; 33. Rotating shaft two; 331. Sprocket two; 34. Chain; 35. Cam; 351. Spring; 4. Shaping device; 40. Support column; 401. Clamping plate; 402. Pushing plate; 41. Assembly plate; 411. Folding rod; 412. Rotating shaft one; 413. Strip groove; 414. Extension plate; 415. Counterweight block; 42. Transmission plate; 421. Transmission groove; 43. Shaping rod; 431. Sliding column one; 432. Sliding column two; 44. Flipping block; 46. Spline; 461. Protrusion. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0042] The present invention provides a device for testing the resistance of a heating wire in a new energy power battery and the heating wire thereof, comprising two aspects: a heating wire in a new energy power battery and a device for testing the resistance of a heating wire in a new energy power battery.

[0043] Please see Figure 1-2 A heating wire for a new energy power battery includes a heating wire 100 and a conductive plug 200. The heating wire 100 is provided with glass fiber 101, metal wire 102 and insulating layer 103 arranged sequentially from the inside to the outside. The metal wire 102 is spirally wound around the outer peripheral wall of the glass fiber 101 with the same spiral pitch to ensure the stability of the resistance value and the uniformity of heating of the heating wire 100. The insulating layer 103 forms a fully enclosed protective structure for the glass fiber 101 and the metal wire 102.

[0044] The two ends of the heating wire 100 are firmly connected to the conductive plug 200, so that the heating wire 100 forms a closed ring structure. The conductive plug 200 can be connected to an external power supply circuit to provide a stable working current to the heating wire 100, ensuring that the current can form a complete and continuous current circuit inside the heating wire 100.

[0045] The specific working principle of heating wire 100 is as follows:

[0046] When the heating wire 100 is connected to the power supply system, as the current flows through the metal wire 102, the free electrons inside the metal wire 102 will collide frequently with the metal atoms, achieving efficient conversion of electrical energy into heat energy based on the Joule heating effect, causing the temperature of the metal wire 102 to rise rapidly.

[0047] The glass fiber 101, as the core supporting component of the heating wire 100, has multiple characteristics such as high temperature resistance, excellent insulation performance, and uniform heat conduction. It can play a shaping role for the spirally wound metal wire 102, effectively preventing the metal wire 102 from deforming or shifting during heating or installation, thereby avoiding safety hazards caused by short circuits caused by contact of the metal wire 102. It can also quickly and evenly conduct the heat generated by the metal wire 102 to the surroundings.

[0048] The insulating layer 103 covering the outer layer of the metal wire 102 is made of a high thermal conductivity insulating material. Its functions are: first, to achieve electrical isolation between the metal wire 102 and the external battery module components, eliminating the risk of leakage or short circuit during the operation of the heating wire 100, and ensuring the electrical safety of the battery pack; second, to have good thermal conductivity, which can efficiently transfer the heat transferred by the glass fiber 101 to the surface of the power battery cell, thereby improving the heating efficiency of the thermal management system.

[0049] The specific reason why excessive bending of the heating wire 100 leads to inaccurate resistance detection is that excessive bending of the heating wire 100 during resistance detection causes local stretching or contraction of the metal wire 102 surrounding the glass fiber 101. This results in slight changes in the effective conductive length and pitch of the metal wire 102, causing the measured resistance value to deviate from the reference value. The larger the bending angle and the smaller the radius of curvature, the more obvious the deviation, leading to poor repeatability of the resistance detection value of the heating wire 100. To address the problem caused by excessive bending of the heating wire 100, this invention discloses a resistance testing device for heating wires in new energy power batteries to solve the above problems.

[0050] Please see Figure 3-4 A device for testing the resistance of a heating wire in a new energy power battery includes a base plate 1, a resistance detection device 2, a transmission device 3, and a shaping device 4. The resistance detection device 2 is fixed on the base plate 1 and is connected to a conductive plug 200 to accurately detect the resistance value of the heating wire 100. The transmission device 3 provides driving power to the shaping device 4, driving the shaping device 4 to perform reciprocating motion.

[0051] The shaping device 4 has two movement modes: linear movement and rotational movement. Specifically, it moves linearly along the W direction to stretch and shape the heating wire 100, thereby ensuring the accuracy of the resistance detection value; it moves rotationally along the E direction to return to the initial position. During this process, the heating wire 100 can be folded in an orderly manner to facilitate subsequent packaging and storage operations by the staff.

[0052] The top surface of the base plate 1 is provided with a slide rail 11. The slide rail 11 is connected to the transmission device 3 and the shaping device 4 through a slider 111. A slide groove 12 is mounted on the slide rail 11. The length of both the slide rail 11 and the slide groove 12 is greater than the length of the heating wire 100 to meet the requirements of full-length stretching and shaping of the heating wire 100. A lap plate 13 is fixedly connected to the side of one end of the slide rail 11. A push plate 14 is mounted above the slide rail 11 through a crossbeam 141. The length of the crossbeam 141 is consistent with the length of the slide rail 11. The push plate 14 is located at the end of the stroke of the shaping device 4 moving in the W direction.

[0053] Please see Figure 5-6 The resistance detection device 2 includes a detection body 21, a clamping shell 22, a cylinder 23, and contacts 24. The detection body 21, clamping shell 22, and cylinder 23 are integrated and mounted on the same preset position on the base plate 1 via a support plate 20. The detection body 21 has current output and current receiving functions. Based on the parameters of the output current and the received current, it can calculate the resistance value of the heating wire 100 using Ohm's law and simultaneously display the calculated resistance value visually. The two clamping shells 22 are arranged opposite to each other and are used to clamp and position the conductive plug 200. One clamping shell 22 is fixedly installed, and the other clamping shell 22 is connected to the output end of the cylinder 23 and is driven by the cylinder 23 to achieve a reciprocating sliding action. The two contacts 24 are located inside the two clamping shells 22 and are electrically connected to the detection body 21.

[0054] When the resistance of the heating wire 100 is tested, the two clamping shells 22 clamp the conductive plug 200 through the cylinder 23, and the two contacts 24 make contact with the conductive part of the conductive plug 200. After clamping and shaping are completed, the detection body 21 outputs a preset current to the heating wire 100 and receives the current signal returned by the heating wire 100. Based on the difference between the current output and the return parameters, the resistance value of the heating wire 100 is accurately calculated in combination with the preset calculation model, and the detection data is displayed in real time for the staff to read and record.

[0055] Please see Figure 7-11 The shaping device 4 includes: a support column 40, an assembly plate 41, a transmission plate 42, a shaping rod 43, a flipping block 44, and a spline 46;

[0056] Please see Figure 8-9 The middle part of the assembly plate 41 is rotatably connected to the support column 40 via a pivot 412. A folding rod 411 is fixed at one end of the assembly plate 41. Multiple radially distributed strip grooves 413 are formed on the assembly plate 41 with the pivot 412 as the axis. An extension plate 414 is integrally formed on the lower side of the other end of the assembly plate 41. The extension plate 414 can fit with the overlapping plate 13 to limit the rotation stroke of the assembly plate 41. A counterweight 415 is installed on the upper side of the other end of the assembly plate 41. The counterweight 415 is used to control the rotation direction of the assembly plate 41 when the assembly plate 41 is in a state without external force limiting, specifically driving the assembly plate 41 to rotate counterclockwise. When the extension plate 414 fits with the overlapping plate 13, the counterweight 415 limits the rotation direction of the assembly plate 41 to limit the assembly plate 41 and thus maintain a horizontal state.

[0057] Please see Figure 10 The transmission plate 42 is rotatably connected to the assembly plate 41 via a rotating shaft 412, and a torsion spring (not shown in the figure) is provided at the rotatable connection between the two. The wall surface of the transmission plate 42 is provided with multiple transmission grooves 421, and the transmission grooves 421 and the strip grooves 413 are arranged in a one-to-one correspondence. The transmission grooves 421 and the strip grooves 413 are set at a set inclination angle. In the initial state, with the help of the prestress of the torsion spring, the ends of the transmission grooves 421 and the strip grooves 413 near the axis of the rotating shaft 412 can be connected.

[0058] Please see Figure 8 , Figure 10 The ends of the plurality of shaping rods 43 are respectively equipped with sliding pin 1 431 and sliding pin 2 432. Sliding pin 1 431 is nested in the strip groove 413, and sliding pin 2 432 passes through the strip groove 413 and is nested in the transmission groove 421. In the initial state, the plurality of shaping rods 43 are in a closed state of mutual contact.

[0059] Please see Figure 8 , Figure 11The flipping block 44 is fixedly disposed at the axial position of the transmission plate 42; the rotating shaft 412 passes through the transmission plate 42 and the flipping block 44 in sequence, and the end of the rotating shaft 412 is fixedly provided with a spline 46. A protrusion 461 is provided on one side of the multiple grooves of the spline 46. The side of the protrusion 461 along the clockwise direction is a vertical surface, and the side along the counterclockwise direction is a slope surface. The lower end of the support column 40 is fixedly connected to the slider 111. Multiple locking plates 401 are slidably arranged on the upper end of the support column 40. An elastic element (not shown in the figure) is provided at the sliding connection between the support column 40 and the locking plates 401. The multiple locking plates 401 are arranged in a ring along the axis of the rotating shaft 412. With the help of the elastic force of the elastic element, the multiple locking plates 401 can be pushed into the multiple grooves of the spline 46 respectively, thereby forming a circumferential limit on the rotating shaft 412 and realizing the rotation limit on the assembly plate 41. A push plate 402 is fixedly provided on the end face of the locking plate 401. The length of the push plate 402 is smaller than the length of the locking plate 401, and the opposite end faces of the multiple push plates 402 are all set as arc surfaces.

[0060] Please see Figure 7 , Figure 13 The transmission device 3 includes: a servo motor 31, a roller 32, a rotating shaft 33, a chain 34, and a cam 35;

[0061] Please see Figure 7 , Figure 12 The servo motor 31 is fixedly mounted on the slider 111, and a sprocket 313 is fixedly mounted on the drive shaft 312 of the servo motor 31. The rotating shaft 33 is mounted on the mounting plate, and the axis of the rotating shaft 33 and the rotating shaft 312 are on the same straight line. A sprocket 331 is fixedly mounted on the rotating shaft 33, and the diameter of the sprocket 331 is larger than the diameter of the sprocket 313. The two ends of the chain 34 are respectively sleeved and engaged on the sprocket 313 and the sprocket 331.

[0062] Please see Figure 13 The cam 35 is coaxially slidably sleeved on the rotating shaft 33. The number of protrusions of the cam 35 is consistent with the number of protrusions 461 of the spline 46. The end face of the cam 35 is in contact with the end face of the spline 46. A spring 351 is provided between the cam 35 and the sprocket 331.

[0063] Please see Figures 19-20When the rotating shaft 33 drives the cam 35 to rotate counterclockwise, the protrusion of the cam 35, when passing over the slope of the protrusion 461, is guided by the slope of the protrusion 461, and the cam 35 moves horizontally along the axis of the rotating shaft 33 and compresses the spring 351. Then the protrusion of the cam 35 is in contact with the end of the push plate 402. The above action is repeated. During this process, the cam 35 cannot transmit rotational power to the spline 46, that is, it will not affect the state of the mounting plate 41.

[0064] When the rotating shaft 33 drives the cam 35 to rotate clockwise, the protrusion of the cam 35 first abuts against the arc surface of the push plate 402, pushing the locking plate 401 to move axially along the support column 40, so that the locking plate 401 separates from the groove of the spline 46, releasing the circumferential limit on the rotating shaft 412; at the same time, the protrusion of the cam 35 abuts against the vertical surface of the protrusion 461, thereby driving the spline 46 to rotate around the axis of the rotating shaft 412, driving the assembly plate 41 to rotate synchronously. The width of the protrusion of the cam 35 is greater than that of the groove of the spline 46, so that when rotating, the protrusion of the cam 35 pushes the push plate 402 in advance, so that the locking plate 401 moves away from the groove.

[0065] The roller 32 is engaged within the groove 12. Please refer to [link / reference]. Figure 14 The roller 32 has an arc-shaped groove 321 at the hub of its shaft. The drive shaft 312 transmits power to the roller 32 via a protrusion 314. In the initial state, the protrusion 314 is attached to one end of the arc-shaped groove 321. The time taken for the drive shaft 312 to move the protrusion 314 from one end of the arc-shaped groove 321 to the other end is greater than the time taken for the protrusion of the cam 35 to abut against the vertical surface of the protrusion 461. The technical function of this time difference will be explained in detail in the working principle section. After the servo motor 31 starts, it drives the drive shaft 312 to rotate counterclockwise. The protrusion 314 rotates synchronously with the drive shaft 312, thereby driving the roller 32 to roll along the slide groove 12, thus driving the shaping device 4 to move linearly in the W direction.

[0066] Working principle of this invention:

[0067] Please see Figure 15-16The heating wire 100 is subjected to shaping and resistance detection operations. The specific steps are as follows: First, the two clamping shells 22 clamp the conductive plug 200 through the cylinder 23. The two contacts 24 form contact with the conductive part of the conductive plug 200. Then, the heating wire 100 is sleeved on multiple shaping rods 43. The servo motor 31 is started, driving the shaping device 4 to move linearly in the W direction. When the shaping device 4 reaches the push plate 14, the push plate 14 forms a pushing action on the flipping block 44, pushing the flipping block 44 to perform a flipping action, thereby driving the transmission plate 42 to rotate synchronously around the rotating shaft 412, so that the transmission groove 421 and the end of the strip groove 413 away from the axis of the rotating shaft 412 are connected, and the shaping device 4 stops moving.

[0068] During this process, the sidewall of the transmission groove 421 that is in contact with the sliding column 432 adopts a sloping structure design. With the guidance of this sloping structure, the sliding column 432 can be pushed to move smoothly along the extension direction of the strip groove 413, thereby driving multiple shaping rods 43 to move away from each other radially, thus shaping the heating wire 100 into an approximately teardrop shape. This shape is the optimal shape for resistance detection of the heating wire 100. Specifically, one end of the heating wire 100 is shaped by multiple shaping rods 43 to form a semi-circular structure with a small degree of curvature, while the other end is relatively inclined and connected to the conductive plug 200. This end has a certain amount of slack and is not fully tightened.

[0069] After the heating wire 100 is shaped, the detection body 21 outputs a preset current to the heating wire 100 and simultaneously receives the current signal returning through the heating wire 100 in real time. Based on the difference between the output current parameter and the return current parameter, and combined with a preset calculation model, the detection body 21 accurately calculates the resistance value of the heating wire 100 and displays the detection data in real time. Based on the displayed detection data, staff can determine whether the heating wire 100 meets the preset qualification standards.

[0070] Please see Figure 17-18 The heating wire 100 is folded and packaged. The specific steps are as follows: Because a certain length of slack is reserved at the other end of the heating wire 100, the shaping device 4 can continue to move in the W direction when the multiple shaping rods 43 are not retracted. After the flipping block 44 separates from the push plate 14, the transmission plate 42 rotates in the opposite direction to the initial angle under the action of the torsion spring. During the reverse rotation of the transmission plate 42, the transmission groove 421 pushes the slide column 432 to move, thereby driving the multiple shaping rods 43 to retract. Then the shaping device 4 continues to move to straighten the heating wire 100.

[0071] Servo motor 31 initiates a reverse rotation program, driving protrusion 314 to move towards the other end of arc-shaped slot 321. During this process, the protrusion of cam 35 first abuts against the arc surface of push plate 402, causing locking plate 401 to separate from the groove of spline 46, releasing the circumferential limit on rotating shaft 412. Next, the protrusion of cam 35 abuts against the vertical surface of protrusion 461, driving mounting plate 41 to rotate 175 degrees. Afterward, protrusion 314 and the other end of arc-shaped slot 321 are fully engaged, thereby achieving transmission of roller 32. The purpose of this step is to prevent the shaping device 4 from moving prematurely in the E direction, preventing the heating wire 100 from being tightened first and then loosened, thus avoiding adverse effects on subsequent folding operations of the heating wire 100.

[0072] The assembly plate 41 rotates in the direction E, meaning the folding rod 411 rotates around multiple shaping rods 43 as axes, thereby folding the heating wire 100. Since the diameter of sprocket 1 313 is smaller than the diameter of sprocket 2 331, the rotation speed of the assembly plate 41 is slower than the rotation speed of the roller 32, creating a matching rotation speed. When the shaping device 4 returns to its initial position, the folding of the heating wire 100 is completed simultaneously. The operator then secures the folded heating wire 100 with ties, and subsequently, the cylinder 23 drives the two clamping shells 22 to open, releasing the clamp on the conductive plug 200, allowing the heating wire 100 to be removed.

[0073] Simultaneously, the servo motor 31 drives the protrusion 314 to move towards one end of the arc-shaped slot 321. During this process, the protrusion of the cam 35 separates from the push plate 402, and the engaging plate 401 re-engages into the groove of the spline 46, achieving a second circumferential limit on the assembly plate 41. It should be noted that during the engagement of the engaging plate 401 with the groove, the assembly plate 41 remains stable and does not rotate thanks to the support of the overlapping plate 13.

Claims

1. A device for testing the resistance of heating wires in new energy power batteries, comprising a base plate (1), a resistance detection device (2), a transmission device (3), and a shaping device (4); characterized in that: A resistance detection device (2) is fixed on the base plate (1); a transmission device (3) drives the shaping device (4) to reciprocate; the shaping device (4) moves in a straight line along the W direction. Rotate along the E direction; a push plate (14) is mounted above the base plate (1); The shaping device (4) includes: a support column (40), an assembly plate (41), a transmission plate (42), a shaping rod (43), and a flipping block (44); the middle part of the assembly plate (41) is rotatably connected to the support column (40) through a rotating shaft (412), the support column (40) limits the rotating shaft (412) and is slidably connected to the base plate (1), the assembly plate (41) is fixedly provided with a folding rod (411), and the assembly plate (41) has multiple radially distributed openings. The strip groove (413); the transmission plate (42) is rotatably connected to the assembly plate (41), and a torsion spring (351) is provided at the joint. The transmission plate (42) has multiple transmission grooves (421) arranged one-to-one with the strip groove (413), and the two are set at a set inclination angle; the ends of multiple shaping rods (43) are respectively nested in the strip groove (413) and the transmission groove (421); the flipping block (44) fixes the axis of the transmission plate (42).

2. The device for testing the resistance of heating wire in a new energy power battery according to claim 1, characterized in that: The top surface of the base plate (1) is provided with a slide rail (11). The slide rail (11) is connected to the transmission device (3) and the shaping device (4) through a slider (111). A slide groove (12) is mounted on the slide rail (11). The length of the slide rail (11) and the slide groove (12) is greater than the length of the heating wire (100). A lap plate (13) is fixedly connected to the side of one end of the slide rail (11). The push plate (14) is located at the end of the stroke of the shaping device (4) moving in the W direction.

3. The device for testing the resistance of heating wire in a new energy power battery according to claim 1, characterized in that: The resistance detection device (2) includes a detection body (21), a clamping shell (22), a cylinder (23), and contacts (24). The detection body (21) has current output and current receiving functions. It can calculate the resistance value based on the parameters of the output current and the received current using Ohm's law, and simultaneously display the calculated resistance value visually. The two clamping shells (22) are arranged opposite to each other. One clamping shell (22) is fixedly installed, and the other clamping shell (22) is connected to the output end of the cylinder (23). The two contacts (24) are located inside the two clamping shells (22) and are electrically connected to the detection body (21).

4. The device for testing the resistance of heating wire in a new energy power battery according to claim 1, characterized in that: An extension plate (414) is integrally formed on the lower side of the other end of the assembly plate (41). The extension plate (414) can fit with the overlapping plate (13). A counterweight (415) is installed on the upper side of the other end of the assembly plate (41).

5. The device for testing the resistance of heating wire in a new energy power battery according to claim 1, characterized in that: A spline (46) is fixedly provided at the end of the rotating shaft (412). A protrusion (461) is provided on one side of a plurality of grooves of the spline (46). The protrusion (461) is vertical on one side in the clockwise direction and sloped on the other side in the counterclockwise direction. The lower end of the support column (40) is fixedly connected to the slider (111). A plurality of locking plates (401) are slidably provided on the upper end of the support column (40). 01) The sliding connection is provided with an elastic element, and multiple locking plates (401) are arranged in a ring along the axis of the first rotating shaft (412); multiple locking plates (401) are respectively inserted into multiple grooves of the spline (46), and a push plate (402) is fixed on the end face of the locking plate (401). The length of the push plate (402) is smaller than the length of the locking plate (401), and the opposite end faces of the multiple push plates (402) are all set as arc surfaces.

6. The device for testing the resistance of heating wire in a new energy power battery according to claim 1, characterized in that: The transmission device (3) includes: a servo motor (31), a roller (32), a second rotating shaft (33), a chain (34), and a cam (35); the servo motor (31) is fixedly mounted on the slider (111), and a first sprocket (313) is fixedly mounted on the transmission shaft (312) of the servo motor (31); the axis of the second rotating shaft (33) and the first rotating shaft (412) are on the same straight line; a second sprocket (331) is fixedly mounted on the second rotating shaft (33), and the diameter of the second sprocket (331) is larger than the diameter of the first sprocket (313); the two ends of the chain (34) are respectively fitted with meshing chains. Wheel 1 (313) and sprocket 2 (331); the cam (35) is coaxially slidably sleeved on shaft 2 (33), the number of protrusions of the cam (35) is consistent with the number of protrusions (461) of the spline (46), the end face of the cam (35) is in contact with the end face of the spline (46), and a spring (351) is provided between the cam (35) and sprocket 2 (331); the roller (32) is meshed in the groove (12), and an arc-shaped groove (321) is opened at the hub of the roller (32), and the drive shaft (312) drives the roller (32) through the protrusion (314).

7. The device for testing the resistance of heating wire in a new energy power battery according to claim 6, characterized in that: The time taken for the drive shaft (312) to move the protrusion (314) from one end of the arc-shaped slot (321) to the other end is greater than the time taken for the protrusion of the cam (35) to abut against the vertical surface of the protrusion (461).

8. A heating wire for a new energy power battery, characterized in that: The device for testing the resistance of a heating wire in a new energy power battery as described in claim 1 further includes a heating wire (100) and a conductive plug (200). The heating wire (100) is provided with glass fiber (101), metal wire (102) and an insulating layer (103) from the inside to the outside. The metal wire (102) is spirally wound around the outer wall of the glass fiber (101) with the same spiral pitch. The insulating layer (103) forms a fully enclosed protective structure for the glass fiber (101) and the metal wire (102).

9. A heating wire for a new energy power battery according to claim 8, characterized in that: The two ends of the heating wire (100) are firmly connected to the conductive plug (200), so that the heating wire (100) forms a closed ring structure and can be connected to an external power supply circuit through the conductive plug (200).

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