CN219890610U - Over-current temperature rise testing device for lithium ion battery tab - Google Patents

Abstract

The utility model provides a lithium ion battery tab overcurrent temperature rise testing device, and belongs to the technical field of battery testing. The lithium ion battery tab overcurrent temperature rise testing device comprises a direct current power supply piece, a conductive connecting piece and a temperature acquisition piece. According to the utility model, one end of the conductive connecting piece is electrically connected with the direct current supply piece, the lug is connected with the other end of the conductive connecting piece, current is supplied to the lug, the temperature information of the lug is collected by the temperature collecting piece, the battery is simulated to charge and discharge for one week under different multiplying powers, the highest temperature rise data is obtained, and whether the design of the lug meets the safety and performance requirements can be judged through the highest temperature rise data.

Description

Over-current temperature rise testing device for lithium ion battery tab

Technical Field

The utility model relates to the technical field of battery test, in particular to a lithium ion battery tab overcurrent temperature rise test device.

Background

The temperature rise of the battery comprises the temperature rise of electrochemical reaction of the battery core pack and the electrolyte, and the joule heat and the like generated by the tab and the structural member (including a connecting sheet, a cover plate and the like) when current passes through, and the heat is mixed and generated by a plurality of heat sources, thus the battery belongs to a black box, the heat generation quantity of the tab is difficult to distinguish, and the size design of the tab of the battery is not facilitated.

Chinese patent CN209605962U, publication No. 2019-11-08 discloses a device for accurately testing battery temperature rise, which comprises a vacuum box, a battery placing table, a charge-discharge clamp and a thermocouple, wherein the battery placing table is arranged in the vacuum box, the charge-discharge clamp connected with the anode and the cathode of the battery is arranged on the table top of the battery placing table, the charge-discharge clamp is connected with the anode and the cathode of the battery during testing and is connected with the outside through a charge wire, and when the thermocouple tests the detected temperature, the detected temperature result of the thermocouple is displayed on a temperature measuring instrument outside the box through a wire. The inner wall of the vacuum box in the prior art is subjected to silver plating treatment, heat convection can be avoided in a vacuum state of the battery, heat energy radiated outwards by the battery can be reflected back by the silver-plated inner wall, and the influence of a test environment on a test result is avoided, so that the actual temperature change of the battery is measured rapidly and accurately. Although the temperature rise of the battery can be tested in the patent, the temperature rise of the battery comprises the temperature rise of the core pack, and the joule heat generated by the tab and the structural member when the current passes is difficult to distinguish the heat generation quantity of the tab, which is not beneficial to the design of the tab.

Disclosure of Invention

The utility model aims to provide an overcurrent temperature rise testing device for a lithium ion battery tab, aiming at overcoming the defects of the prior art.

The utility model provides a lithium ion battery tab overcurrent temperature rise testing device which is used for testing tabs and comprises a direct current power supply piece, a conductive connecting piece and a temperature acquisition piece; one end of the conductive connecting piece is electrically connected with the direct current power supply piece and is used for supplying current to the tab when the tab is connected with the other end of the conductive connecting piece; the temperature acquisition piece is used for acquiring temperature information of the tab when the tab is electrified.

Further, the temperature acquisition piece comprises a temperature sensing line, and a data recording module, wherein one end of the temperature sensing line is connected with the lug to acquire temperature information of the lug, and the data recording module is connected with the other end of the temperature sensing line to record the temperature information acquired by the temperature sensing line.

Further, the conductive connecting piece comprises two conductive plates which are symmetrically arranged, two side ends which are far away from each other on the conductive plates are respectively connected with the positive electrode and the negative electrode of the direct current power supply piece, and two side ends which are close to each other on the conductive plates are respectively connected with two side ends of the lug.

Further, the direct current power supply piece includes anodal link and negative pole link, runs through respectively and sets up the first mounting hole on anodal link and negative pole link, two the both sides end that keeps away from each other on the conducting plate is equipped with first screw hole respectively, the conducting connection piece still includes two first screws, anodal link overlap joint in one on the conducting plate, negative pole link overlap joint in another on the conducting plate, one first screw one end pass first mounting hole on the anodal link and spiro union in one first screw hole on the conducting plate, another first screw one end passes first mounting hole on the negative pole link and spiro union in another first screw hole on the conducting plate.

Further, the conductive connecting piece comprises two pressing plates which are respectively arranged above the two conductive plates, and the two pressing plates are symmetrically arranged; the two pressing plates are used for pressing the two side ends of the pole lugs respectively, so that the two side ends of the pole lugs are fixedly connected to the two side ends of the two conducting plates, which are close to each other.

Further, the solar cell further comprises heat conducting glue adhered to the electrode lugs, and one end of the temperature sensing wire is adhered to the heat conducting glue.

Further, the heat-conducting glue is insulating heat-conducting glue.

Further, the conductive connecting piece further comprises an insulating bottom plate used for respectively carrying the two conductive plates.

Further, the conductive connecting piece further comprises at least two second screws, and each conductive plate is provided with at least one adjusting groove with the length larger than the inner diameter of the second screw; one end of the second screw is sequentially connected with different positions of the adjusting groove on the conductive plate and the insulating bottom plate, and the other end of the second screw is sequentially connected with different positions of the adjusting groove on the conductive plate and the insulating bottom plate, so that the distance between the two side ends of the conductive plates, which are close to each other, is adjusted.

Further, the device also comprises a knob structure, one end of which is sequentially connected with one pressing plate and the conducting plate positioned below the pressing plate, a gap is arranged between the pressing plate and the conducting plate positioned below the pressing plate, and the knob structure is two symmetrically arranged; the knob structure rotates along a first preset direction, so that the pressing plate moves towards a direction close to the conductive plate to reduce a gap; the knob structure is rotated in a second preset direction such that the pressure plate moves in a direction away from the conductive plate to increase the gap.

The device for testing the overcurrent temperature rise of the lithium ion battery tab has the following beneficial effects:

one end of the conductive connecting piece is electrically connected with the direct current supply piece, the lug is connected with the other end of the conductive connecting piece, current is supplied to the lug, the temperature information of the lug is collected by the temperature collecting piece, the battery is simulated to charge and discharge for one week under different multiplying powers, the highest temperature rise data is obtained, and whether the design of the lug meets the safety and performance requirements can be judged through the highest temperature rise data.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model. In the drawings, like reference numerals are used to identify like elements. The drawings, which are included in the description, illustrate some, but not all embodiments of the utility model. Other figures can be derived from these figures by one of ordinary skill in the art without undue effort.

Fig. 1 is a schematic structural diagram of an overcurrent temperature rise test device for a lithium ion battery tab according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a conductive connector in a lithium ion battery tab overcurrent temperature rise test device according to an embodiment of the utility model.

In the figure: the device comprises a 1-conductive connecting piece, a 11-conductive plate, a 12-pressing plate, a 13-insulating bottom plate, a 14-second screw, a 15-first threaded hole, a 16-adjusting groove, a 17-knob structure, a 2-direct current power supply piece, a 21-positive electrode connecting end, a 22-negative electrode connecting end, a 23-first mounting hole, a 3-temperature acquisition piece, a 31-temperature sensing wire, 32-heat conducting glue, a 33-data recording module and a 4-tab.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be arbitrarily combined with each other.

Please refer to fig. 1-2. The embodiment of the utility model provides a lithium ion battery tab overcurrent temperature rise testing device which is used for testing a tab (4) and comprises a direct current power supply piece (2), a conductive connecting piece (1) and a temperature acquisition piece (3); one end of the conductive connecting piece (1) is electrically connected with the direct current power supply piece (2) and is used for supplying current to the lug (4) when the lug (4) is connected with the other end of the conductive connecting piece (1); the temperature acquisition piece (3) is used for acquiring temperature information of the lug (4) when the lug (4) is electrified.

Here, electrically conductive connecting piece (1) one end electricity is connected in direct current power supply piece (2), the other end is connected in utmost point ear (4), then form a closed loop, then realize supplying power for utmost point ear (4), set up the energizing current, recording time and ambient temperature can test, simulate battery charge and discharge a week under different multiplying powers, let in the electric current of equidimension on utmost point ear (4), obtain the highest temperature rise data, whether design of utmost point ear (4) satisfies safety and performance requirement through the highest temperature rise data, can effectively simulate the temperature rise of test lithium ion battery in the charge-discharge in-process utmost point ear (4), avoid the testing process to the loss of battery, reduce test cost.

The temperature acquisition piece (3) can include one end is connected in the temperature sensing line (31) that utmost point ear (4) are used for gathering utmost point ear (4) temperature information, is connected in temperature sensing line (31) other end and is used for recording temperature information's that temperature sensing line (31) gathered data record module (33).

Specifically, the data recording module (33) may be a daily LR8431CN data recorder. The data recording module (33) records real-time temperature information of the temperature sensing wire (31) acquisition lug (4).

The conductive connecting piece (1) can comprise two conductive plates (11) with the top ends kept flush, two side ends far away from each other on the two conductive plates (11) are respectively connected with the positive electrode and the negative electrode of the direct current power supply piece (2), and two side ends close to each other on the two conductive plates (11) respectively support two side ends of the lug (4).

Specifically, the top ends of the two conductive plates (11) are kept flush, so that the two side ends of the tab (4) are conveniently lapped on the two conductive plates (11) respectively. The two conductive plates (11) may be symmetrically arranged. The two side ends far away from each other on the two conductive plates (11) are respectively connected with the positive electrode and the negative electrode of the direct current power supply piece (2), the two side ends of the lug (4) are respectively lapped on the two side ends close to each other on the two conductive plates (11), and then the direct current power supply piece (2) can supply power for the lug (4) through the two conductive plates (11).

The direct current power supply piece (2) can include positive electrode connecting end (21) and negative electrode connecting end (22), run through respectively and set up first mounting hole (23) on positive electrode connecting end (21) and negative electrode connecting end (22), both sides end that keep away from each other on two conducting plates (11) are equipped with first screw hole (15) respectively, conducting connection piece (1) still includes two first screws, positive electrode connecting end (21) overlap joint is on one conducting plate (11), negative electrode connecting end (22) overlap joint is on another conducting plate (11), first screw one end passes first mounting hole (23) on positive electrode connecting end (21) and spiro union first screw hole (15) on one conducting plate (11), first mounting hole (23) on negative electrode connecting end (22) are passed to another first screw one end and screwed first screw hole (15) on another conducting plate (11).

Specifically, the first mounting hole (23) on the positive electrode connecting end (21) and the first threaded hole (15) below the first mounting hole have the same central axis, namely the first mounting hole (23) and the first threaded hole (15) are coaxially arranged; the first mounting hole (23) on the negative electrode connecting end (22) and the first threaded hole (15) below the first mounting hole have the same central axis, namely the first mounting hole (23) and the first threaded hole (15) are coaxially arranged. The positive electrode connecting end (21) and one conducting plate (11) are fixedly connected, the negative electrode connecting end (22) and the other conducting plate (11) are fixedly connected through two first screws respectively, when the two first screws are screwed down respectively, the bottom of the positive electrode connecting end (21) is abutted to one conducting plate (11), the bottom of the negative electrode connecting end (22) is abutted to the other conducting plate (11), then the positive electrode connecting end (21) and one conducting plate (11) are conducted, the negative electrode connecting end (22) and the other conducting plate (11) are conducted, the positive electrode connecting end (21) and one conducting plate (11) are connected in series, the negative electrode connecting end (22) and the other conducting plate (11) are connected in series, and then the direct current power supply piece (2) can supply power for one conducting plate (11) through the positive electrode connecting end (21) and the other conducting plate (11) through the negative electrode connecting end (22).

The conductive connecting piece (1) can comprise two pressing plates (12) respectively arranged above the two conductive plates (11); the two pressing plates (12) are used for pressing the two side ends of the lug (4) respectively, so that the two side ends of the lug (4) are fixedly connected to the two side ends of the two conductive plates (11) which are close to each other respectively.

In particular, the two pressure plates (12) may be symmetrically arranged. The current conducting plate (11) can be rectangle current conducting plate (11), a minor face of one current conducting plate (11) can be connected in anodal link (21) of direct current power supply spare (2), another minor face is used for supporting utmost point ear (4) one side end, a minor face of another current conducting plate (11) can be connected in negative pole link (22) of direct current power supply spare (2), another minor face is used for supporting utmost point ear (4) opposite side end, clamp plate (12) can be rectangle clamp plate (12), clamp plate (12) can be on a parallel with current conducting plate (11), clamp plate (12) push down utmost point ear (4) one side end, another clamp plate (12) push down utmost point ear (4) opposite side end, thereby push down utmost point ear (4) top, make utmost point ear (4) bottom can butt in two current conducting plates (11), avoid utmost point ear (4) both sides end to play and influence and give utmost point ear (4) power supply, then direct current power supply spare (2), two current conducting pieces, utmost point ear (4) form a stable conductive loop, thereby give utmost point ear (4).

As the overcurrent temperature rise testing device for the lithium ion battery electrode lug in the embodiment, the device can further comprise heat conducting glue (32) adhered to the electrode lug (4), and one end of the temperature sensing wire (31) is adhered to the heat conducting glue (32).

Specifically, the heat conducting glue (32) can bond one end of the temperature sensing wire (31) on the lug (4), and as the two pressing plates (12) respectively press the two side ends of the lug (4), only the middle part of the lug (4) is exposed, and then the heat conducting glue (32) is bonded at the middle part of the lug (4). One end of the temperature sensing wire (31) is lapped on the lug (4) when insulating heat conducting glue is not arranged, the temperature sensing wire (31) can also collect temperature information of the lug (4), the heat conducting glue (32) is used for fixing the temperature sensing wire (31) on the lug (4), and the heat conducting glue (32) can transfer heat of the lug (4) to the temperature sensing wire (31), so that the temperature can be collected conveniently and better.

The heat conductive glue (32) may be an insulating heat conductive glue.

Specifically, in order to avoid the temperature sensing wire (31) from being influenced by the current on the tab (4), the current is separated from the temperature sensing wire (31) by the insulating heat-conducting glue.

The conductive connection (1) may further comprise an insulating base plate (13) for carrying the two conductive plates (11) respectively.

Specifically, the insulating bottom plate (13) can support the conductive plate (11), so that the situation that the conductive plate (11) leaks to other positions to endanger personnel safety after being electrified is avoided.

The conductive connecting piece (1) can also comprise at least two second screws (14), and each conductive plate (11) is provided with at least one adjusting groove (16) with the length larger than the inner diameter of the second screw (14); one end of one second screw (14) is sequentially connected with different positions of the adjusting groove (16) on one conductive plate (11) and the insulating bottom plate (13), and one end of the other second screw (14) is sequentially connected with different positions of the adjusting groove (16) on the other conductive plate (11) and the insulating bottom plate (13) so as to adjust the distance between the side ends of the two conductive plates (11) which are close to each other.

Specifically, the area of the insulating base plate (13) is larger than the sum of the areas of the two conductive plates (11). The insulating bottom plate (13) can be provided with a containing groove, the short side of the conducting plate (11) is parallel to the short side of the containing groove, the long side of the conducting plate (11) is parallel to the long side of the containing groove, the width of the containing groove can be equal to the width of the conducting plate (11), the sum of the lengths of the two conducting plates (11) is smaller than the length of the containing groove, and then the lug (4) can be placed between the two conducting plates (11). One end of a second screw (14) is sequentially connected with an adjusting groove (16) and an insulating bottom plate (13) on the conducting plate (11), and the top end of the second screw (14) is abutted against the conducting plate (11), so that the conducting plate (11) and the insulating bottom plate (13) are fixedly connected. The second screws (14) are sequentially connected to different positions of the adjusting grooves (16) and the insulating bottom plate (13), so that the positions of the conducting plates (11) are adjusted on the insulating bottom plate (13), the distance between the side ends, close to each other, of the two conducting plates (11) is adjusted, the electrode lugs (4) with different lengths are adapted to, the electrode lugs (4) with different lengths are conveniently overlapped on the two conducting plates (11), the conducting plates (11) can be easily adjusted, and the electrode lugs (4) with different sizes are applicable to the electrode lugs (4) with different sizes.

As the overcurrent temperature rise testing device of the lithium ion battery tab in the embodiment, the device also comprises a knob structure (17) of which one end is sequentially connected with a pressing plate (12) and a conductive plate (11) positioned below the pressing plate (12), a gap is arranged between the pressing plate (12) and the conductive plate (11) positioned below the pressing plate, and at least one knob structure (17) is arranged on one pressing plate (12); the knob structure (17) rotates along a first preset direction, so that the pressing plate (12) moves towards the direction close to the conductive plate (11) to reduce the gap; the knob structure (17) is turned in a second preset direction such that the pressure plate (12) is moved in a direction away from the conductive plate (11) to increase the gap.

Specifically, when the tab (4) needs to be placed on the conductive plate (11), the knob structure (17) rotates along the second preset direction, so that the pressing plate (12) moves in a direction away from the conductive plate (11) to increase the gap, and after the tab (4) is placed, the knob structure (17) rotates along the first preset direction, so that the pressing plate (12) moves in a direction close to the conductive plate (11) to reduce the gap, and the tab (4) is pressed on the conductive plate (11). The pressing plate (12) can be provided with a second mounting hole in a penetrating mode, the conducting plate (11) located below the pressing plate (12) can be provided with a second threaded hole, the knob structure (17) can comprise a rotating rod, a bearing sleeved on the rotating rod and a threaded portion arranged on the rotating rod and located below the bearing, the outer ring of the bearing is sleeved on the second mounting hole, the threaded portion is in threaded connection with the second threaded hole, when the rotating rod rotates along a second preset direction, the bottom end of the rotating rod moves towards a direction away from the bottom end of the second threaded hole, the bearing is driven to move upwards, and the pressing plate (12) is driven to move towards a direction away from the conducting plate (11), so that a gap is increased; when the rotating rod rotates along the first preset direction, the bottom end of the rotating rod moves towards the direction close to the bottom end of the second threaded hole, so that the bearing is driven to move downwards, and the pressing plate (12) is driven to move towards the direction close to the conductive plate (11), and the gap is reduced.

Specifically, the first screw is sequentially connected to the first mounting hole (23) and the first threaded hole (15) so as to fixedly connect the conductive plate (11) with the direct current power supply piece (2). The conducting plate (11) can move on the insulating bottom plate (13), and the pressing plate (12) and the conducting plate (11) fix the two ends of the lug (4) to be tested in the gap. Three knob structures (17) can be arranged on the pressing plate (12) from left to right in sequence, the knob structures (17) are used for fixedly connecting the pressing plate (12) with the conductive plate (11), and the pressing plate (12) can be moved up and down or fixedly connecting the pressing plate (12) with the conductive plate (11) through rotating the knob structures (17). The adjusting groove (16) can be a return groove, the second screw (14) is used for fixedly connecting the conducting plate (11) with the insulating bottom plate (13), the second screw (14) can move left and right in the return groove, and the relative positions of the conducting plates (11) on the two sides on the insulating bottom plate (13) are adjusted so as to be suitable for the lugs (4) with different lengths. The electrode lug (4) to be tested is arranged in the conductive connecting piece (1) to be clamped, insulating heat-conducting glue is stuck to the middle of the electrode lug (4), a temperature sensing wire (31) connected with the data recording module (33) is stuck to the insulating heat-conducting glue, energizing current is set, the recording time and the ambient temperature can be tested, the temperature rise of the electrode lug (4) in the charging and discharging process of the lithium ion battery can be effectively simulated and tested, the loss of the battery in the testing process is avoided, and the testing cost is reduced.

The above description may be implemented alone or in various combinations and these modifications are within the scope of the present utility model.

It should be noted that, in the description of the present utility model, the terms "upper end," "lower end," and "bottom end" of the indicated orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the application, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. The utility model provides a lithium ion battery tab overflows temperature rise testing arrangement for test tab (4), its characterized in that: comprises a direct current power supply piece (2), a conductive connecting piece (1) and a temperature acquisition piece (3); one end of the conductive connecting piece (1) is electrically connected with the direct current power supply piece (2) and is used for supplying current to the lug (4) when the lug (4) is connected with the other end of the conductive connecting piece (1); the temperature acquisition piece (3) is used for acquiring temperature information of the lug (4) when the lug (4) is electrified.

2. The lithium ion battery tab overcurrent temperature rise testing device according to claim 1, wherein: the temperature acquisition piece (3) comprises a temperature sensing line (31) with one end connected to the lug (4) for acquiring temperature information of the lug (4), and a data recording module (33) connected to the other end of the temperature sensing line (31) for recording the temperature information acquired by the temperature sensing line (31).

3. The lithium ion battery tab overcurrent temperature rise testing device according to claim 1 or 2, wherein: the conductive connecting piece (1) comprises two conductive plates (11) with the top ends kept flush, two side ends far away from each other on the conductive plates (11) are respectively connected with the positive electrode and the negative electrode of the direct current power supply piece (2), and two side ends close to each other on the conductive plates (11) are respectively used for supporting the side ends of the lug (4).

4. The lithium ion battery tab overcurrent temperature rise testing device according to claim 3, wherein: the direct current power supply piece (2) comprises an anode connecting end (21) and a cathode connecting end (22), and first mounting holes (23) which are respectively formed in the anode connecting end (21) and the cathode connecting end (22) in a penetrating mode, two side ends which are far away from each other on the conducting plate (11) are respectively provided with first threaded holes (15), the conducting connecting piece (1) further comprises two first screws, the anode connecting end (21) is lapped on one conducting plate (11), the cathode connecting end (22) is lapped on the other conducting plate (11), one end of each first screw penetrates through the first mounting hole (23) in the anode connecting end (21) and is connected with the first threaded hole (15) in one conducting plate (11) in a threaded mode, and the other end of each first screw penetrates through the first mounting hole (23) in the cathode connecting end (22) and is connected with the first threaded hole (15) in the other conducting plate (11) in a threaded mode.

5. The lithium ion battery tab overcurrent temperature rise testing device according to claim 3, wherein: the conductive connecting piece (1) comprises two pressing plates (12) which are respectively arranged above the two conductive plates (11); the two pressing plates (12) are used for pressing the two side ends of the lug (4) respectively, so that the two side ends of the lug (4) are fixedly connected to the two side ends of the two conducting plates (11) which are close to each other respectively.

6. The lithium ion battery tab overcurrent temperature rise testing device according to claim 2, wherein: the solar cell also comprises a heat conducting adhesive (32) adhered to the tab (4), and one end of the temperature sensing wire (31) is adhered to the heat conducting adhesive (32).

7. The lithium ion battery tab overcurrent temperature rise testing device according to claim 6, wherein: the heat conducting glue (32) is insulating heat conducting glue.

8. The lithium ion battery tab overcurrent temperature rise testing device according to claim 3, wherein: the conductive connecting piece (1) further comprises an insulating bottom plate (13) used for respectively carrying the two conductive plates (11).

9. The lithium ion battery tab overcurrent temperature rise testing device according to claim 8, wherein: the conductive connecting piece (1) further comprises at least two second screws (14), and each conductive plate (11) is provided with at least one adjusting groove (16) with the length larger than the inner diameter of the second screw (14); one end of the second screw (14) is sequentially connected to different positions of the adjusting groove (16) on the conductive plate (11) and the insulating bottom plate (13), and the other end of the second screw (14) is sequentially connected to different positions of the adjusting groove (16) on the conductive plate (11) and the insulating bottom plate (13) so as to adjust the distance between the side ends of the two conductive plates (11) which are close to each other.

10. The lithium ion battery tab overcurrent temperature rise testing device according to claim 5, wherein: the device also comprises a knob structure (17) with one end connected with one pressing plate (12) and a conductive plate (11) positioned below the pressing plate (12) in sequence, a gap is arranged between the pressing plate (12) and the conductive plate (11) positioned below the pressing plate, and at least one knob structure (17) is arranged on one pressing plate (12); the knob structure (17) rotates along a first preset direction, so that the pressing plate (12) moves towards a direction close to the conductive plate (11) to reduce a gap; the knob structure (17) is turned in a second preset direction such that the pressure plate (12) is moved in a direction away from the conductive plate (11) to increase the gap.