Weak guide plate incoming material resistance testing device of power battery cover plate and use method thereof

Abstract

The invention discloses a weak guide plate incoming material resistance testing device for a power battery cover plate and a use method thereof, and relates to the technical field of power battery cover plate detection, and the weak guide plate incoming material resistance testing device comprises a pressure display and an internal resistance instrument which are arranged on a base; a positioning mechanism and an adjusting mechanism are arranged on the base; the positioning mechanism comprises a positioning frame arranged on the base; the adjusting mechanism comprises a rotating ring, at least one pair of clamping blocks and a driving mechanism. A lifting adjusting mechanism and a pressure display are arranged; the internal resistance of the assembled weak guide plate is tested by pressurizing at the incoming material stage, the finished cover plate assembling mode is simulated, the test pressure interval is obtained, and the problem of poor resistance caused by the fact that the incoming material monomer resistance value of the weak guide plate cannot be monitored is solved; and cover plate finished product scrapping caused by poor supplied materials is avoided, and cost output is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery cover plate detection, and particularly relates to a weak guide plate incoming material resistance testing device for a power battery cover plate and a using method thereof. Background Art

[0002] As an important component of the power battery cover plate, the main purpose of the weak guide plate is to protect the battery from damage under extreme conditions and ensure the safety of products and personnel using these batteries.

[0003] At present, in the traditional cover plate structure, during the production process of the battery cover plate, the resistance value of the weak guide plate body is directly tested to be 20,000 - 30,000 Ω. After being made into a finished product, the resistance of the cover plate finished product is tested to be 100 - 1000 Ω. The resistance value of the incoming material of the weak guide plate cannot be effectively monitored; only the internal resistance of the weak guide plate can be detected after the battery cover plate is assembled. At this time, when the weak guide plate is a defective product, the entire battery cover plate finished product will be scrapped, resulting in high cost output. Summary of the Invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a weak guide plate incoming material resistance testing device for a power battery cover plate and a using method thereof, which are used to solve the problem that the resistance value of the incoming material of the weak guide plate cannot be effectively monitored, resulting in the scrapping of the cover plate finished product due to defective incoming materials as mentioned in the above background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A weak guide plate incoming material resistance testing device for a power battery cover plate includes a pressure display and an internal resistance meter arranged on a base; a positioning mechanism and an adjustment mechanism are arranged on the base; the positioning mechanism includes a positioning frame arranged on the base; the adjustment mechanism includes:

[0007] A rotating ring, the rotating ring is rotatably connected to the positioning frame around its axis;

[0008] At least one pair of clamping blocks, at least one pair of the clamping blocks are fixedly arranged on the rotating ring and are used for clamping the weak guide plate of the battery cover plate assembly;

[0009] A driving mechanism, the driving mechanism is used to drive the rotating ring to rotate reciprocally, so that the clamping blocks drive the weak guide plate to rotate reciprocally.

[0010] Preferably, guide plates are arranged on both sides of the positioning frame, which are used to provide moving guidance when the battery cover plate assembly moves onto the positioning frame.

[0011] Preferably, a pair of first sliders are fixedly arranged on the rotating ring, and a pair of first chutes adapted to the first sliders are opened on the positioning frame, and the pair of first chutes are located on the same circumference with the axis of the output shaft of the pressure display as the center.

[0012] Preferably, the driving mechanism includes a mounting plate, a motor, a gear, a rack, and a second slider; the motor is mounted on the base through the mounting plate, and the gear is coaxially connected to the output end of the mounting plate; the rack is slidably connected to the mounting plate along its length direction, and the rack meshes with the gear; a second chute perpendicular to the sliding direction of the rack is formed on the rack, the second slider is fixedly arranged on the rotating ring, and the second slider is slidably connected to the second chute.

[0013] Preferably, a third chute parallel to the sliding direction of the rack is formed on the rack, and the output shaft of the motor is slidably connected to the third chute.

[0014] Preferably, the gear is coaxially rotatably connected to the output shaft of the motor, and a torsion spring is arranged between the gear and the motor.

[0015] Preferably, a pressing plate is arranged at the output end of the pressure display and is used to cooperate with the base to apply pressure to the battery cover assembly; a pressure control mechanism is arranged between the output end of the pressure display and the pressing plate, and the pressure control mechanism is used to control the pressure of the pressing plate on the battery cover assembly.

[0016] Preferably, the pressure control mechanism includes a connecting plate, a plurality of sliding shafts, and a second compression spring; the connecting plate is coaxially and fixedly arranged at the output end of the pressure display; one ends of the plurality of sliding shafts are fixedly arranged on the pressing plate, and the other ends of the plurality of sliding shafts are inserted into the connecting plate; the second compression spring is arranged between the pressing plate and the connecting plate.

[0017] Preferably, a lifting and adjusting mechanism is arranged on the base; the lifting and adjusting mechanism includes a sleeve, a worm gear, a worm, a handwheel, a lead screw, and a third slider; the sleeve is fixedly arranged on the base, the worm gear is coaxially rotatably connected to the sleeve, the lead screw is inserted into the sleeve, and the lead screw is coaxially and threadedly sleeved on the worm gear; the worm is rotatably connected to the base, and the worm meshes with the worm gear; the handwheel is mounted on the handwheel; the third slider is fixedly arranged on the lead screw, and the third slider is slidably connected to the base along the axis of the lead screw;

[0018] The pressure display and the internal resistance meter are mounted on the lead screw through the mounting plate; a scale is fixedly arranged on the mounting plate, a jack adapted to the scale is formed on the base, and the bottom end of the scale is inserted into the jack.

[0019] A method for using a weak guide plate incoming material resistance testing device for a power battery cover plate includes the following steps:

[0020] Step 1: Positioning the weak guide plate: Push the battery cover assembly along its length direction onto the positioning frame until one end of the battery cover assembly contacts the positioning frame. At this time, the center position of the guide plate on the battery cover assembly coincides with the axis of the output end of the pressure display.

[0021] Step 2, rubber ring adjustment: the pressure value that the rubber ring bears after the battery cover assembly is assembled and welded is set as a predetermined value; control the pressure display to drop from the initial position until the displayed value is equal to the predetermined value, and record the predetermined drop distance H; when testing the battery cover assembly, make the pressure display drop from the initial position by a predetermined distance H. If the pressure value at this time matches the predetermined value, it is determined that the battery cover assembly is in a standard assembly state, and the weak guide plate internal resistance test can be directly performed; if the pressure value does not match, it is determined that there are wrinkles in the rubber ring, and the adjustment mechanism is used to push the weak guide plate to reciprocate until the value on the pressure display is stable and close to the predetermined value, indicating that the rubber ring is judged to have returned to a flat state, and the weak guide plate internal resistance test can be performed at this time.

[0022] Beneficial effects of the present invention:

[0023] 1. By setting up a lifting and adjusting mechanism and a pressure display, the internal resistance of the assembled weak guide plate can be tested under pressure at the incoming material stage, the assembly method of the finished cover plate can be simulated, and the test pressure range can be obtained to solve the problem of poor resistance caused by the inability to monitor the single resistance value of the weak guide plate incoming material; avoid the scrapping of the finished cover plate due to poor incoming materials, and reduce cost output;

[0024] 2. By setting up an adjustment mechanism, it is possible to identify whether the rubber ring in the battery cover assembly after assembly is wrinkled. After wrinkles occur, the adjustment mechanism can be used to drive the weak guide plate to reciprocate and adjust the rubber ring to reduce detection errors and improve efficiency.

[0025] 3. By setting up a pressure control mechanism, when the rubber ring in the battery cover assembly is wrinkled, the battery cover assembly is subjected to less pressure through the pressure control mechanism, so that when the wrinkles of the rubber ring are adjusted by the adjustment mechanism, the battery cover assembly is in a stable assembly state, thereby improving the stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 5 is a schematic three-dimensional structure diagram of the present invention;

[0032] Figure 6 is a schematic three-dimensional structure diagram of the present invention;

[0033] Figure 7 is a schematic three-dimensional structure diagram of the present invention;

[0034] Figure 8 is a schematic three-dimensional structure diagram of the present invention;

[0035] Figure 9 is a schematic three-dimensional structure diagram of the present invention;

[0036] Figure 10 is a schematic three-dimensional structure diagram of the present invention.

[0037] In the figure: 1, base; 2, pressure display; 21, pressing plate; 3, internal resistance meter; 4, battery cover assembly; 5, positioning mechanism; 51, positioning frame; 52, guide plate; 6, adjustment mechanism; 61, rotating ring; 62, clamping block; 63, first slider; 64, first chute; 65, driving mechanism; 651, mounting plate; 652, motor; 653, gear; 654, rack; 655, second chute; 656, second slider; 657, third chute; 7, pressure control mechanism; 71, connecting plate; 72, sliding shaft; 73, second compression spring; 8, lifting adjustment mechanism; 81, sleeve; 82, worm gear; 83, worm; 84, hand wheel; 85, lead screw; 86, third slider; 9, scale. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1 - 9 , a weak guide plate incoming material resistance testing device for a power battery cover, as Figures 1 - 4 and Figure 7As shown in the figure, it includes a pressure display 2 and an internal resistance meter 3 provided on a base 1; a positioning mechanism 5 and an adjustment mechanism 6 are provided on the base 1; the positioning mechanism 5 includes a positioning frame 51 provided on the base 1; guide plates 52 are provided on both sides of the positioning frame 51, which are used to provide moving guidance for the battery cover plate assembly 4 when it moves onto the positioning frame 51; through the setting of the guide plates 52, guidance is provided for the battery cover plate assembly 4 to move into the positioning frame 51, so that the battery cover plate assembly 4 can be quickly aligned and positioned in the positioning frame 51; the adjustment mechanism 6 includes a rotating ring 61, at least a pair of clamping blocks 62 and a driving mechanism 65; wherein, the rotating ring 61 is rotatably connected to the positioning frame 51 around its axis; at least a pair of clamping blocks 62 are fixed on the rotating ring 61 and are used to clamp the weak guide plate of the battery cover plate assembly 4; the driving mechanism 65 is installed on the base 1 and is used to drive the rotating ring 61 to rotate reciprocally, so that the clamping blocks 62 drive the weak guide plate to rotate reciprocally.

[0040] It should be noted that the assembled battery cover plate assembly 4 is pushed into the positioning frame 51 along its length direction until the end of the battery cover plate assembly 4 abuts against the inner wall of the positioning frame 51. At this time, the center point of the weak guide plate on the battery cover plate assembly 4 just coincides with the axis of the output end of the pressure display 2, and the weak guide plate on the battery cover plate assembly 4 close to the positioning frame 51 just inserts between a pair of clamping blocks 62. Then, by driving the pressure display 2 to move downward, the output end of the pressure display 2 cooperates with the base 1 to squeeze the battery cover plate assembly 4 until the rubber ring in the battery cover plate assembly 4 is in the same compressed state as the rubber ring after the battery cover plate assembly 4 is assembled and welded. At this time, the internal resistance of the weak guide plate is detected by the internal resistance meter 3, that is, the internal resistance detection work before welding after assembly is completed; when the internal resistance of the weak guide plate detected by the internal resistance meter 3 does not meet the standard, a new weak guide plate can be quickly replaced, and other components can be reused, effectively monitoring the resistance value of the incoming weak guide plate, avoiding the waste of the cover plate finished product caused by poor incoming materials, and greatly reducing the cost;

[0041] When the rubber ring inside the battery cover plate assembly 4 is in a flat state, the pressure display 2 moves downward to squeeze the battery cover plate assembly 4, so that the rubber ring inside the battery cover plate assembly 4 after assembly and the rubber ring after the battery cover plate assembly 4 is assembled and welded have the same compression state, and record the pressure value of the pressure display 2 at this time, marked as the predetermined value. At this time, record that the pressure display 2 drops a predetermined distance H from the initial position; then when directly performing the weak guide plate internal resistance detection on the subsequently assembled battery cover plate assembly 4, first drive the pressure display 2 to drop a predetermined distance H. When the pressure value displayed by the pressure display 2 at this time is close to or equal to the predetermined value, it is determined that the battery cover plate assembly 4 is normally assembled, and the weak guide plate internal resistance detection can be directly performed; when the pressure value displayed by the pressure display 2 is greater than the predetermined value, it is determined that the rubber ring inside the battery cover plate assembly 4 is wrinkled. At this time, the clamping block 62 on the rotating ring 61 is driven by the driving mechanism 65 to rotate reciprocally at a small angle with the center of the rotating ring 61 as the rotation point, thereby driving the weak guide plate to rotate reciprocally with a certain movement amplitude, so that the rubber ring clamped under the weak guide plate is stressed and deformed to a certain extent, so that the rubber ring can be smoothed, facilitating the subsequent weak guide plate internal resistance detection work.

[0042] Please refer to Figure 4 and Figures 6 - 9 In an alternative embodiment, the driving mechanism 65 includes a mounting plate 651, a motor 652, a gear 653, a rack 654, and a second slider 656; the motor 652 is mounted on the base 1 through the mounting plate 651, and the gear 653 is coaxially connected to the output end of the mounting plate 651; the rack 654 is slidably connected to the mounting plate 651 along its length direction, and the rack 654 meshes with the gear 653; a second chute 655 perpendicular to the sliding direction of the rack 654 is formed on the rack 654, the second slider 656 is fixedly provided on the rotating ring 61, and the second slider 656 is slidably connected to the second chute 655.

[0043] It should be noted that the sector gear 653 is driven by the motor 652 to rotate reciprocally (the motor 652 is a servo motor, which is a prior art), the rack 654 is driven by the sector gear 653 to move reciprocally, so that the rack 654 pushes the second slider 656 to move through the second chute 655, thereby driving the rotating ring 61 to rotate reciprocally, and then driving the clamping block 62 to rotate reciprocally. The wrinkled rubber ring is smoothed by pushing the weak guide plate reciprocally by the clamping block 62. When the pressure display 2 drops to the predetermined distance H and the pressure value displayed on the pressure display 2 is close to or equal to the predetermined value, it is determined that the rubber ring is flat and the normal weak guide plate internal resistance detection can be performed.

[0044] Please refer to Figures 6 - 8, in an optional embodiment, a third sliding groove 657 parallel to the sliding direction is formed on the rack 654, and the output shaft of the motor 652 is slidably connected to the third sliding groove 657; a first compression spring is arranged between the rack 654 and the mounting plate 651; when the rack 654 loses restraint, the first compression spring drives the rack 654 to reset.

[0045] It should be noted that the gear 653 is a sector gear. By the combined use of the sector gear and the first compression spring, the motor 652 can continuously rotate in one direction to drive the rack 654 to perform reciprocating motion, that is, it can be realized by an ordinary motor, which can reduce the cost output; specifically, the sector gear 653 is driven to rotate by the motor 652. When the sector gear 653 meshes with the rack 654, the rack 654 can be driven to slide forward. When the sector gear 653 is separated from the rack 654, the first compression spring drives the rack 654 to move and reset, so as to realize the reciprocating motion of the rack 654, that is, drive the rotating ring 61 to rotate reciprocally; it can be understood that the elastic force of the first compression spring is much greater than the frictional force received by the rubber ring, that is, it can definitely push the weak guide plate to rotate reciprocally, so as to realize smoothing the wrinkles of the rubber ring.

[0046] Please refer to Figures 7 - 9 , in an optional embodiment, a pair of first sliders 63 are fixedly arranged on the rotating ring 61, a pair of first sliding grooves 64 adapted to the first sliders 63 are formed on the positioning frame 51, and the pair of first sliding grooves 64 are located on the same circumference with the axis of the output shaft of the pressure display 2 as the center of the circle.

[0047] It should be noted that when the rotating ring 61 is forced to rotate, the first slider 63 can be driven to slide along the first sliding groove 64. By the combined use of the first slider 63 and the first sliding groove 64, the rotation stability of the rotating ring 61 is improved.

[0048] Please refer to Figures 1 - 2 and Figure 5 , in an optional embodiment, a pressing plate 21 is arranged at the output end of the pressure display 2 and is used to cooperate with the base 1 to apply pressure to the battery cover assembly 4; a pressure control mechanism 7 is arranged between the output end of the pressure display 2 and the pressing plate 21, and the pressure control mechanism 7 is used to control the pressure of the pressing plate 21 on the battery cover assembly 4; the pressure control mechanism 7 includes a connecting plate 71, a plurality of sliding shafts 72 and a second compression spring 73; the connecting plate 71 is coaxially and fixedly arranged at the output end of the pressure display 2; one ends of the plurality of sliding shafts 72 are fixedly arranged on the pressing plate 21, and the other ends of the plurality of sliding shafts 72 are inserted into the connecting plate 71; the second compression spring 73 is arranged between the pressing plate 21 and the connecting plate 71.

[0049] It should be noted that when the driving pressure display 2 descends, first the pressing plate 21 contacts the battery cover plate assembly 4. As the pressure display 2 continues to descend, the second compression spring 73 is compressed. During this process, it does not affect the pressure detection of the pressure display 2 on the battery cover plate assembly 4. When the rubber ring wrinkles, it can drive the pressure display 2 to rise, so that the pressing plate 21 keeps squeezing the battery cover plate assembly 4. At this time, the second compression spring 73 is only slightly compressed. At this time, driving the rotating ring 61 to rotate makes the weak guide plate reciprocate, which can ensure that the battery cover plate assembly 4 is in a stable assembled state. At this time, since the pressure display 2 has moved upward by a certain distance, after driving the rotating ring 61 to reciprocate for a certain period of time, the pressure display 2 is driven to descend to restore the pressure on the battery cover plate assembly 4. By comparing the pressure value displayed on the pressure display 2 with the predetermined value, when they match, the internal resistance of the weak guide plate is detected. When they do not match, the pressure display 2 is driven to move upward again, and the weak guide plate is driven to reciprocate again. This cycle continues until it is determined that the rubber ring is in a flat state.

[0050] Please refer to Figures 1 - 4 , in an optional embodiment, a lifting and adjusting mechanism 8 is provided on the base 1; the lifting and adjusting mechanism 8 includes a sleeve 81, a worm gear 82, a worm 83, a handwheel 84, a lead screw 85 and a third slider 86; the sleeve 81 is fixedly provided on the base 1, the worm gear 82 is coaxially rotatably connected to the sleeve 81, the lead screw 85 is inserted into the sleeve 81, and the lead screw 85 is coaxially thread sleeved on the worm gear 82; the worm 83 is rotatably connected to the base 1, and the worm 83 meshes with the worm gear 82; the handwheel 84 is installed on the handwheel 84; the third slider 86 is fixedly provided on the lead screw 85, and the third slider 86 is slidably connected to the base 1 along the axis of the lead screw 85; the pressure display 2 and the internal resistance meter 3 are installed on the lead screw 85 through a mounting rod; a scale 9 is fixedly provided on the mounting rod, a jack adapted to the scale 9 is opened on the base 1, and the bottom end of the scale 9 is inserted into the jack.

[0051] It should be noted that driving the pressure display 2 to lift and lower through the lifting and adjusting mechanism 8 is specifically as follows: driving the worm 83 to rotate through the handwheel 84, thereby driving the worm gear 82 to rotate, so that the lead screw 85 lifts and lowers under the guidance of the third slider 86, and at the same time drives the scale 9 to lift and lower to determine the lifting and lowering distance of the pressure display 2; it can be understood that through the cooperation of the worm gear 82 and the worm 83, due to the axial self-locking characteristic of this component, the pressure display 2 can stay at any height arbitrarily, improving the control and use convenience.

[0052] Please refer to Figures 1 - 10 , a method for using a weak guide plate incoming material resistance testing device for a power battery cover plate includes the following steps:

[0053] Step 1. Weak guide plate positioning: Push the battery cover plate assembly 4 along its length direction onto the positioning frame 51 until one end of the battery cover plate assembly 4 abuts against the positioning frame 51. At this time, the center position of the weak guide plate on the battery cover plate assembly 4 coincides with the axis of the output end of the pressure display 2;

[0054] Step 2. Rubber ring adjustment: Take the pressure value borne by the rubber ring after the battery cover plate assembly 4 is assembled and welded as the predetermined value; control the pressure display 2 to descend from the initial position until the displayed value is equal to the predetermined value, and record the descending predetermined distance H; when detecting the battery cover plate assembly 4, make the pressure display 2 descend a predetermined distance H from the initial position. If the pressure value is consistent with the predetermined value at this time, it is determined that the battery cover plate assembly 4 is in the standard assembled state, and the weak guide plate internal resistance detection can be directly carried out; if the pressure value does not match, it is determined that there are wrinkles in the rubber ring, and use the adjustment mechanism 6 to push the weak guide plate to rotate reciprocally until the value on the pressure display 2 is stable and close to the predetermined value, indicating that it is judged that the rubber ring has returned to a flat state, and at this time, the weak guide plate internal resistance detection can be carried out.

[0055] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] The above has described a specific embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as used to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A device for testing the resistance of a weak guide plate of a power battery cover, comprising a pressure display (2) and an internal resistance meter (3) arranged on a base (1); characterized in that: The base (1) is provided with a positioning mechanism (5) and an adjustment mechanism (6); the positioning mechanism (5) comprises a positioning frame (51) arranged on the base (1); the adjustment mechanism (6) comprises: A rotating ring (61), the rotating ring (61) is rotatably connected to the positioning frame (51) around its axis; At least one pair of clamping blocks (62), wherein the at least one pair of clamping blocks (62) is fixedly mounted on the rotating ring (61) and is used to clamp the weak guide plate of the battery cover assembly (4); The driving mechanism (65) is used to drive the rotating ring (61) to rotate reciprocatingly, so that the clamping block (62) drives the weak guide plate to rotate reciprocatingly.

2. A device for testing the incoming resistance of a weak guide plate of a power battery cover according to claim 1, characterized in that: The driving mechanism (65) comprises a mounting plate (651), a motor (652), a gear (653), a rack (654) and a second slider (656); the motor (652) is mounted on the base (1) via the mounting plate (651), the gear (653) is coaxially connected to the output end of the mounting plate (651); the rack (654) is slidably connected to the mounting plate (651) along its length direction, and the rack (654) is meshed with the gear (653); a second slide groove (655) perpendicular to the sliding direction of the rack (654) is provided on the rack (654), the second slider (656) is fixed to the rotating ring (61), and the second slider (656) is slidably connected to the second slide groove (655).

3. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 2, characterized in that: The rack (654) is provided with a third sliding groove (657) parallel to its sliding direction, and the output shaft of the motor (652) is slidably connected to the third sliding groove (657).

4. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 3, characterized in that: A first compression spring is arranged between the rack (654) and the mounting plate (651); when the rack (654) loses its restriction, the first compression spring drives the rack (654) to return to its original position.

5. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 1, characterized in that: Guide plates (52) are provided on both sides of the positioning frame (51) for providing movement guidance for the battery cover assembly (4) when it moves onto the positioning frame (51).

6. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 1, characterized in that: A pair of first sliding blocks (63) are fixedly provided on the rotating ring (61), and a pair of first sliding grooves (64) adapted to the first sliding blocks (63) are provided on the positioning frame (51), and the pair of first sliding grooves (64) are located on the same circumference with the axis of the output shaft of the pressure display (2) as the center.

7. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 1, characterized in that: The output end of the pressure display (2) is provided with a pressure plate (21) and is used to cooperate with the base (1) to apply pressure to the battery cover assembly (4); a pressure control mechanism (7) is provided between the output end of the pressure display (2) and the pressure plate (21), and the pressure control mechanism (7) is used to control the pressure of the pressure plate (21) on the battery cover assembly (4).

8. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 7, characterized in that: The pressure control mechanism (7) comprises a connecting plate (71), a plurality of sliding shafts (72) and a second compression spring (73); the connecting plate (71) is coaxially fixed to the output end of the pressure display (2); one end of the plurality of sliding shafts (72) is fixed to the pressure plate (21), and the other end of the plurality of sliding shafts (72) is plugged into the connecting plate (71); the second compression spring (73) is arranged between the pressure plate (21) and the connecting plate (71).

9. A device for testing the resistance of a weak guide plate of a power battery cover according to claim 1, characterized in that: The base (1) is provided with a lifting and lowering adjustment mechanism (8); the lifting and lowering adjustment mechanism (8) comprises a sleeve (81), a worm wheel (82), a worm (83), a hand wheel (84), a screw (85) and a third slider (86); the sleeve (81) is fixedly arranged on the base (1), the worm wheel (82) is coaxially rotatably connected to the sleeve (81), the screw (85) is inserted into the sleeve (81), and the screw (85) is coaxially threadedly sleeved on the worm wheel (82); the worm (83) is rotatably connected to the base (1), and the worm (83) is meshed with the worm wheel (82); the hand wheel (84) is mounted on the hand wheel (84); the third slider (86) is fixedly arranged on the screw (85), and the third slider (86) is slidably connected to the base (1) along the axis of the screw (85); The pressure display (2) and the internal resistance meter (3) are mounted on the screw rod (85) via a mounting rod; a scale (9) is fixedly mounted on the mounting rod, a socket matching the scale (9) is provided on the base (1), and the bottom end of the scale (9) is plugged into the socket.

10. A method for using a device for testing the incoming resistance of a weak guide plate of a power battery cover according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Positioning the weak guide plate: Push the battery cover assembly (4) along its length direction onto the positioning frame (51) until one end of the battery cover assembly (4) contacts the positioning frame (51), and at this time, the center position of the guide plate on the battery cover assembly (4) coincides with the axis of the output end of the pressure display (2); Step 2, rubber ring adjustment: control the pressure display (2) to drop from the initial position until the displayed value is equal to the preset value, and record the preset drop distance H; when testing the battery cover assembly (4), make the pressure display (2) drop from the initial position by the preset distance H. If the pressure value does not match the preset value, it is judged that there are wrinkles in the rubber ring, and the adjustment mechanism (6) is used to push the weak guide plate to reciprocate until the value on the pressure display (2) is stable and close to the preset value, indicating that the rubber ring has returned to a flat state, and the internal resistance of the weak guide plate can be tested at this time.

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