CN218036923U - Lower clamp for high-voltage resistance test of battery core and test tool - Google Patents

Abstract

The utility model provides a lower clamp for high-voltage resistance test of an electric core and a test tool, wherein the lower clamp for high-voltage resistance test of the electric core comprises a lower clamp body and an auxiliary support body; the lower clamp body is provided with a main bearing surface and a lug bearing surface; the auxiliary supporting body is provided with an auxiliary supporting surface; the auxiliary bearing surface is provided with a first position connected with the main bearing surface and a second position positioned above the main bearing surface; when the auxiliary bearing surface is located at the first position, the lower pressure borne by the top of the battery cell is not lower than the qualified pressure of the high-voltage resistance test of the battery cell. The test of electric core high pressure resistant is with anchor clamps down, vice bearing surface on the auxiliary supporting body have and meet the primary importance in order to constitute electric core bearing surface with main bearing surface to and be located the second place of main bearing surface top, carry out continuous bearing in the face of electric core through electric core bearing when primary importance, do benefit to and prevent that the indentation from appearing in the electric core, the overdraft that electric core bore simultaneously is not less than qualified pressure, thereby do benefit to the effect and the precision that improve the test.

Description

Lower clamp for high-voltage resistance test of battery core and test tool

Technical Field

The utility model relates to a battery test technical field, in particular to test of electric core is with lower anchor clamps. The utility model discloses still relate to a test fixture of anchor clamps under test of this resistant high pressure of electric core has.

Background

With the popularization and application of lithium ion batteries, people pay more and more attention to the safety of the batteries. The high voltage resistance test of the battery cell is a test for detecting the pressure bearing capacity of the battery cell and is an important test for evaluating the safety of the battery.

When the high-voltage resistance test is performed on the battery cell, the battery cell is clamped by an upper clamp and a lower clamp, and then the downward pressure is applied to the upper clamp, so that the bearing capacity of the battery cell in a power-on state is obtained. Because electric core generally needs clamping structure to place on the electric core bearing surface of lower fixture, and clamping structure can be partly located the lower surface of electric core for need set up the groove of dodging that is used for dodging clamping structure on the lower fixture. But the arrangement of avoiding the groove not only stacks up dust and impurities easily, but also can lead the battery cell bearing surface to bear the battery cell incompletely, thereby leading to lower test precision. In addition, if the downward pressure applied to the battery core is small, fine particles in the diaphragm cannot pierce the diaphragm under the pressure, so that the hidden danger cannot be detected in advance, and the testing accuracy is low.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an electric core is anchor clamps under high pressure resistant test to improve the bearing effect to electric core, and do benefit to the precision that improves the test.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a lower clamp for a high-voltage-resistant test of a battery cell is used for bearing and clamping the battery cell to be tested and comprises a lower clamp body and an auxiliary supporting body;

the lower clamp body is provided with a main bearing surface for bearing part of the battery core and a polar lug bearing surface for bearing each polar lug;

the auxiliary supporting body is arranged on the lower clamp body in a sliding mode and is provided with an auxiliary bearing surface used for bearing the other part of the battery cell;

the auxiliary supporting body can slide up and down relative to the lower clamp body, so that the auxiliary supporting surface has a first position which is connected with the main supporting surface to form a battery cell supporting surface, and a second position which is positioned above the main supporting surface;

and when the auxiliary bearing surface is positioned at the first position, the lower pressure borne by the top of the battery cell is not lower than the qualified pressure of the high-voltage resistance test of the battery cell.

Further, the lower clamp comprises a first driving part arranged at the bottom of the lower clamp body;

the power output end of the first driving part is connected with the auxiliary supporting body so as to drive the auxiliary supporting body to slide relative to the lower clamp body and switch between the first position and the second position.

Furthermore, the auxiliary supporting body is provided with a plurality of supporting columns which are arranged at intervals, and the plurality of supporting columns penetrate through the lower clamp body;

the top surfaces of the support columns jointly form the auxiliary bearing surface.

Furthermore, the auxiliary supporting body is also provided with a connecting piece connected between the supporting columns;

the connecting piece is located below the lower clamp body.

Further, the qualified pressure of the high-pressure resistance test of the battery core is not lower than 50000N.

Compared with the prior art, the utility model discloses following advantage has:

electric core is anchor clamps under high pressure resistant test, through for the gliding auxiliary supporting body of anchor clamps body down, make the vice holding surface on the auxiliary supporting body have and meet with main holding surface in order to constitute the primary importance of electric core holding surface, and be located the second place of main holding surface top, and then can be convenient for putting into of electric core when vice holding surface is in the second place, and carry out continuous bearing in the face of electric core through electric core bearing when vice holding surface removes to the primary importance, thereby prevent that indentation from appearing in the test process electric core, do benefit to the effect and the precision that improve the test. Meanwhile, when the auxiliary bearing surface is limited to be located at the first position, the lower pressure borne by the top of the battery cell is not lower than the qualified pressure of the high-voltage resistance test of the battery cell, so that the diaphragm can be pierced by small particles in the diaphragm, and the test precision can be further improved.

In addition, the first driving part can be beneficial to driving the auxiliary supporting body to slide relative to the lower clamp body, so that the state of the auxiliary supporting surface is switched. The simple structure of a plurality of support columns is convenient for arrange and is implemented, and does benefit to many electric cores and bear to avoid being used for placing the centre gripping structure on vice bearing surface with electric core. Through setting up the connecting piece, do benefit to the synchronization action that realizes a plurality of support columns, and can improve the bearing effect of vice bearing surface. Qualified pressure is not lower than 50000N, and the requirement that the particles pierce the diaphragm can be met, so that the test precision is improved.

In addition, another object of the present invention is to provide a testing tool for testing high voltage resistance of an electrical core, which comprises a base, an upper clamp slidably disposed on the base and having an upper clamp body, a lower pressing portion disposed on the base and pushing the upper clamp body downwards, and conductive members respectively connected to the tabs; the method is characterized in that: the lower clamp for the high-voltage-resistant test of the battery cell is positioned below the upper clamp body;

due to the fact that the pushing of the pressing portion is received, the electric core on the electric core bearing surface can be extruded by the extrusion surface at the bottom of the upper clamp body.

Further, the pressing part adopts a servo motor;

the test tool for the high voltage resistance test of the battery cell further comprises a distance measuring sensor;

the distance measuring sensor is used for measuring the distance between the extrusion surface and the battery cell bearing surface.

Furthermore, the conductive piece is arranged on the upper clamp body in a sliding mode through a second driving part, and the conductive piece is detachably connected to the power output end of the second driving part.

Furthermore, the upper clamp body slides on the base in a guiding manner, and an elastic piece is arranged between the upper clamp body and the base.

Further, the lower clamp body can be driven to slide along the base to have a working position below the upper clamp body and an initial position moved out of the lower position of the upper clamp body.

Compared with the prior art, the utility model discloses following advantage has:

test fixture is used to resistant high pressure test of electric core, can realize the centre gripping to electric core through last anchor clamps body and the cooperation between the anchor clamps body down to exert decurrent extrusion force to last anchor clamps body through splenium down, electric connection between electrically conductive piece and the utmost point ear can carry out high pressure test to electric core under the state of electric core circular telegram, and has better measuring accuracy.

In addition, the pressing part adopts a servo motor, so that the pressing force which is not lower than the qualified pressure is favorably applied to the battery cell. Through the measurement of distance between extrusion face and the electric core bearing surface of range finding sensor, can obtain the change of electric core thickness in high pressure resistant test process to do benefit to the high pressure resistant performance who obtains electric core. Through the detachable connection between the conductive piece and the second driving part, the conductive piece is favorably detached and the model is favorably replaced. The arrangement of the elastic piece between the upper clamp body and the base is beneficial to improving the extrusion effect of the upper clamp body on the battery in use. Through switching between work position and the initial position of anchor clamps body down, do benefit to the loading and the test of realization to electric core.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural view of a lower fixture for high voltage resistance testing of a battery cell according to a first embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

fig. 3 is a schematic structural view of the lower fixture for high voltage resistance test of the battery cell when the secondary bearing surface in fig. 2 is at the first position;

fig. 4 is a schematic structural view of the lower fixture for the high voltage resistance test of the battery cell when the secondary bearing surface in fig. 2 is at a second position;

fig. 5 is a schematic structural view of a test tool for a high voltage resistance test of a battery cell according to an embodiment of the present invention;

fig. 6 is an enlarged view of a portion a in fig. 5.

Description of reference numerals:

1. a lower clamp body; 2. a support pillar; 3. an electric core; 4. a base; 5. an upper clamp body; 6. a second cylinder; 7. a lead screw motor;

101. a positioning claw; 102. a boss; 1021. a polar ear bearing surface; 103. a main bearing surface; 104. a first cylinder;

201. a secondary bearing surface; 202. a connecting member;

301. a tab;

401. a top plate; 402. a connecting bolt; 403. a base plate; 404. a servo motor; 405. a guide post; 406. A spring; 407. a ranging sensor; 408. a slide rail;

601. a conductive member; 602. an insulating plate.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The embodiment relates to a lower clamp for a high-voltage-resistant test of an electric core, which is used for bearing and clamping an electric core 3 to be tested at high voltage. On whole the constitution, this test of nai high voltage of electricity core is with lower anchor clamps includes anchor clamps body 1 and auxiliary stay body down. The lower fixture body 1 has a main supporting surface 103 for supporting a part of the battery cell 3, and a tab supporting surface 1021 for supporting each tab 301. The auxiliary supporting body is slidably arranged on the lower clamp body 1 and is provided with a secondary bearing surface 201 for bearing another part of the battery core 3. The auxiliary support body can slide up and down relative to the lower jig body 1, so that the auxiliary support surface 201 has a first position which is connected with the main support surface 103 to form a support surface of the battery cell 3, and a second position which is positioned above the main support surface 103. And when the auxiliary bearing surface 201 is located at the first position, the downward pressure borne by the top of the electrical core 3 is not lower than the qualified pressure of the high-voltage resistance test of the electrical core.

Based on the above general description, an exemplary structure of the bottom clamp for high voltage endurance test of the battery cell described in this embodiment is shown in fig. 1. The main bearing surface 103 on the lower clamp body 1 is the partial upper surface of the lower clamp body 1, a plurality of positioning claws 101 respectively arranged on two sides of the main bearing surface 103 are further arranged on the lower clamp body 1, and two sides of the battery core 3 can be clamped and positioned by the positioning claws 101.

The positioning claws 101 also have a positioning state of clamping both sides of the battery cell 3 and a release state of releasing the positioning of the battery cell 3. When the positioning claws 101 are in a loose state, the distance between the oppositely arranged positioning claws 101 is larger than the width of the battery cell 3, and at the moment, the battery cell 3 can be freely taken and placed. Thereby close to each other through the contained angle that sets up relatively after electric core 3 places targets in place and press from both sides tightly electric core 3's both sides to make positioning pawl 101 switch to the positioned state. The structure of the positioning claws 101 and the connection relationship with the lower clamp body 1 in this embodiment can be referred to in the prior art, and the description thereof is provided herein.

Corresponding to the tabs 301 at the two ends of the battery cell 3, the upper surface of the lower fixture body 1 is provided with a boss 102, and the upper surface of the boss 102 forms the tab bearing surface 1021. After the battery cell 3 is placed in place, the bottom surface of each tab 301 can abut against the corresponding tab bearing surface 1021.

In order to drive the auxiliary supporting body to slide relative to the lower fixture body 1, the lower fixture for a high voltage resistance test of a battery cell in the embodiment further includes a first driving portion disposed at the bottom of the lower fixture body 1. The power output end of the first driving part is connected with the auxiliary supporting body so as to drive the auxiliary supporting body to slide relative to the lower clamp body 1 and switch between a first position and a second position.

As a preferred embodiment, the auxiliary supporting body in this embodiment has a plurality of supporting pillars 2 arranged at intervals, the plurality of supporting pillars 2 are arranged through the lower fixture body 1, and top surfaces of the plurality of supporting pillars 2 jointly constitute the auxiliary supporting surface 201. A plurality of through holes corresponding to the support pillars 2 are arranged on the lower clamp body 1 in a penetrating manner, and the sum of the areas of the through holes is the area of the auxiliary bearing surface 201. To further improve the stability of the secondary support in use, at least one support post 2 is provided through the central portion of the primary support surface 103.

As shown in fig. 1 in the specific structure, the number of the support columns 2 in this embodiment is specifically five, one support column 2 is disposed through the middle of the lower fixture body 1, and the other four support columns 2 are disposed on two sides of the support column 2 in the middle in a group of two. Through the middle part of support column 2 bearing electricity core 3 at middle part, the both ends of electricity core 3 are supported to the support column 2 of both sides, so can do benefit to and realize the independent bearing of a plurality of support columns 2 to electricity core 3, and have better bearing effect.

Wherein, the area of the top surface is greater than the area of the top surfaces on the rest four support columns 2 on the support column 2 that is located the middle part to further improve the bearing effect of support column 2 to electric core 3. Of course, the schemes that the areas of the top surfaces of the supporting columns 2 are equal or unequal are feasible, and the schemes can be selected according to the use requirements in specific implementation. In addition, the total number of the support columns 2, the arrangement modes, the number and the like of the support columns 2 positioned at the middle part and on the two sides can be determined according to requirements, and the battery cell 3 can be stably supported by the cooperation of the support columns 2.

In a preferred embodiment, the auxiliary supporting body further has a connecting member 202 connected between the supporting columns 2, and the connecting member 202 is located below the lower jig body 1. As shown in fig. 3, the connecting member 202 in this embodiment adopts a plate-shaped structure connected to the bottom of each supporting column 2, so that a plurality of supporting columns 2 can slide synchronously, thereby having better stability in use, and the connecting member 202 has a simple structure, and is convenient to arrange and implement. The first driving part adopts a first air cylinder 104 arranged at the bottom of the lower clamp body 1, and an air cylinder rod of the first air cylinder 104 is arranged downwards and is connected with the connecting piece 202.

When the cylinder rod of the first cylinder 104 retracts, the supporting pillars 2 can be driven to slide upwards relative to the lower fixture body 1 through the connecting part 202 and extend out of the lower fixture body 1, and at this time, the auxiliary bearing surface 201 is located at the first position. Because of vice bearing surface 201 is located the top of main bearing surface 103 under the first position for by electric core 3 under the clamping structure centre gripping placing at the in-process of vice bearing surface 201, can not contact with main bearing surface 103, thereby need not to set up on main bearing surface 103 and dodge the groove, can place electric core 3 at the top of each support column 2.

When the cylinder rod of the first cylinder 104 extends, the supporting pillars 2 can be driven to slide downward relative to the lower fixture body 1 through the connecting members 202 and retract into the lower fixture body 1, and at this time, as shown in fig. 4, the secondary supporting surface 201 is in the second position. In the second position, the auxiliary bearing surface 201 is continuously connected with the main bearing surface 103 and is in the same plane, so that the bottom surface of the battery cell 3 completely abuts against the battery cell 3 bearing surface jointly formed by the main bearing surface 103 and the auxiliary bearing surface 201, and the bottom surface of the tab 301 completely abuts against the tab bearing surface 1021. Therefore, the electric core 3 can not generate indentation when being extruded, and has higher test precision.

In addition, in this embodiment, the qualified pressure of the high voltage resistance test of the battery core is not lower than 50000N, and thus the battery core 3 can be ensured to be completely pierced by the small particles in the diaphragm when being pressed and extruded by the downward pressure, so that the short circuit of the battery core 3 is tested, and the detection precision is further improved. Of course, in specific implementations, the acceptable pressure setting can also be selected and determined according to specific test criteria, as long as it is ensured that the small particles can pierce the septum. This embodiment the high pressure resistant test of electric core is with anchor clamps down, through the gliding auxiliary supporting body for anchor clamps body 1 down, make the vice holding surface 201 on the auxiliary supporting body have the primary importance that meets in order to constitute electric core 3 holding surface with main holding surface 103, and be located the second place of main holding surface 103 top, and then can be convenient for putting into of electric core 3 when vice holding surface 201 is in the second place, and carry out continuous bearing to electric core 3 through electric core 3 bearing surface when vice holding surface 201 removes to the primary importance, thereby prevent that indentation from appearing in the test procedure electric core 3, and be difficult for having the detection dead angle, and then do benefit to the effect and the precision that improve the test. Meanwhile, when the auxiliary bearing surface 201 is limited to be located at the first position, the downward pressure borne by the top of the battery core 3 is not lower than the qualified pressure of the high-voltage resistance test of the battery core, so that the small particles in the diaphragm can pierce through the diaphragm, and the test precision can be further improved. Example two

The embodiment relates to a test fixture for testing high voltage resistance of an electric core, which comprises a base 4, an upper clamp with an upper clamp body 5, a lower pressing part and conductive pieces 601, wherein the upper clamp is arranged on the base 4 in a sliding mode, the lower pressing part pushes the upper clamp body 5 downwards, and the conductive pieces 601 are arranged on the base 4 and are connected with lugs 301 respectively. The test tool for the high voltage resistance test of the battery cell further comprises a lower clamp for the high voltage resistance test of the battery cell, wherein the lower clamp is positioned below the upper clamp body 5. Because of the top of accepting the push-down portion, the extrusion face of 5 bottoms of upper clamp body can extrude electric core 3 on the 3 bearing faces of electric core.

Based on the above general description, an exemplary structure of the test tool for testing high voltage resistance of a battery cell described in this embodiment is shown in fig. 5, where the base 4 includes a bottom plate 403, a top plate 401 disposed above the bottom plate 403 in parallel, and a plurality of connecting bolts 402 connected between the bottom plate 403 and the top plate 401, and is configured such that a distance between the top plate 401 and the bottom plate 403 is fixed. The upper clamp in this embodiment may be a product well-known in the art, and the upper clamp body 5 thereof is slidably connected to the top plate 401.

In order to further improve the effect of the upper clamp body 5 in use, the upper clamp body 5 is guided to slide on the base 4, and an elastic member is arranged between the upper clamp body 5 and the base 4. Specifically, as shown in fig. 5, the upper jig body 5 is provided with a plurality of guide posts 405, and a plurality of guide holes are provided in the top plate 401 corresponding to the guide posts 405. The upper clamp body 5 is guided to slide on the upper clamp body 5 by the penetration of the guide posts 405 in the corresponding guide holes.

Wherein, for preventing that guide post 405 from deviating from in by the guiding hole, still can be equipped with the stopper on the top of guide post 405, thereby this stopper can play spacing effect with the upper surface butt of roof 401. The elastic member is a spring 406 sleeved on each guide post 405, which is beneficial to improving the stability of the spring 406 in use.

The pressing part adopts the servo motor 404 arranged on the top plate 401, and the power output end of the servo motor 404 is connected with the upper clamp body 5, so that downward pressing force can be applied to the battery cell 3 through the upper clamp body 5. The servo motor 404 is used for applying downward pressure, which can meet the requirement of qualified pressure in the first embodiment, that is, the downward pressure applied by the servo motor 404 is not lower than 50000N, so that the tiny particles in the battery cell 3 can pierce the diaphragm under such pressure, the short-circuited battery cell 3 can be detected in advance, and the detection precision is high.

The conductive piece 601 in this embodiment is used for being electrically connected to the tab 301, so that the battery cell 3 is subjected to a high voltage resistance test in an energized state, and the description is unqualified when the battery cell 3 is short-circuited. In a preferred embodiment, the conductive member 601 of the present embodiment is slidably disposed on the upper fixture body 5 through the second driving portion, and the conductive member 601 is detachably connected to the power output end of the second driving portion.

The second driving part is a second cylinder 6 corresponding to the tab 301, and may be a product well-known in the art, such as a sliding cylinder, as shown in fig. 5 and 6. The power output end of the second cylinder 6 is connected with an insulating plate 602, and the conductive piece 601 specifically adopts a conductive copper block arranged on the lower surface of the insulating plate 602. The insulating plate 602 is provided to improve the safety of the conductive member 601 in use. In addition, by the detachable connection between the conductive member 601 and the second cylinder 6, the mounting and dismounting of the conductive member 601, the replacement of the conductive member 601, and the like are facilitated.

In this embodiment, the lower jig body 1 can be urged to slide along the base 4, and has a working position located below the upper jig body 5, and an initial position moved out of the lower position of the upper jig body 5. Specifically, as shown in fig. 5, two slide rails 408 arranged in parallel are provided on the bottom plate 403 of the base 4, and the lower jig body 1 slides along the slide rails 408 between the operating position and the initial position. In order to drive the lower fixture body 1 to slide, a screw motor 7 is disposed on the bottom plate 403, a screw of the screw motor 7 is connected to the lower fixture body 1 by a screw joint, and when the screw motor 7 drives the screw to rotate, the lower fixture body 1 can be driven to slide between the first position and the second position along the slide rail 408.

In addition, in order to obtain the high pressure resistance of the battery cell 3, the test fixture for testing high pressure resistance of a battery cell in this embodiment further includes a distance measuring sensor 407, where the distance measuring sensor 407 is configured to measure a distance between the pressing surface and the bearing surface of the battery cell 3. The distance measuring sensor 407 in the present embodiment may adopt a mature product in the prior art, and may obtain the value of the thickness of the electric core 3 in the process of gradually increasing the pressing force of the servo motor 404 by measuring the distance between the pressing surface and the bearing surface of the electric core 3, so as to obtain the high voltage resistance test data of the electric core 3.

As a preferred embodiment, the two bases 4 in this embodiment are connected, and the bottom plates 403 in the two bases 4 are connected, and a space for accommodating the battery cell 3 in the initial position is formed between the two bases 4. Locate two servo motor 404 and two and go up anchor clamps body 5 on each roof 401, can hold two anchor clamps bodies 1 down simultaneously on each bottom plate 403, so make single base 4 can carry out high voltage resistance test to two electric cores 3 simultaneously, whole electric core is high voltage resistance test fixture for test can carry out high voltage resistance test to four electric cores 3 simultaneously to do benefit to the efficiency of software testing to electric core 3 of improvement.

As shown in fig. 5, two slide rails 408 are disposed across the two bottom plates 403, each bottom plate 403 is provided with the above-mentioned lead screw motor 7, the two lead screw motors 7 are respectively disposed at two sides of the two slide rails 408, and each lead screw can simultaneously screw and connect the end portions of the two lower fixture bodies 1, so that the two lower fixture bodies 1 can be simultaneously driven to slide between the initial position and the working position.

This embodiment test fixture is used in resistant high voltage test of electric core, can realize the centre gripping to electric core 3 through last anchor clamps body 5 and the cooperation between the anchor clamps body 1 down to exert decurrent extrusion force to last anchor clamps body 5 through the splenium, electrically connect between 601 and the utmost point ear 301 of electrically conductive, can carry out resistant high voltage test to electric core 3 under the state of 3 circular telegrams of electric core, and have better measuring accuracy.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a clamp down is used in resistant high pressure test of electric core for bear and the centre gripping treats electric core (3) of high pressure test, its characterized in that:

the lower clamp for the high-voltage-resistant test of the battery cell comprises a lower clamp body (1) and an auxiliary supporting body;

the lower clamp body (1) is provided with a main bearing surface (103) used for bearing part of the battery core (3) and a lug bearing surface (1021) used for bearing each lug (301);

the auxiliary supporting body is arranged on the lower clamp body (1) in a sliding mode and is provided with an auxiliary supporting surface (201) used for bearing another part of the battery core (3);

the auxiliary supporting body can slide up and down relative to the lower clamp body (1), so that the auxiliary supporting surface (201) has a first position which is connected with the main supporting surface (103) to form a supporting surface of the battery cell (3), and a second position which is positioned above the main supporting surface (103);

and when the auxiliary bearing surface (201) is located at the first position, the lower pressure borne by the top of the battery cell (3) is not lower than the qualified pressure of the high-voltage resistance test of the battery cell.

2. The lower clamp for the high voltage resistance test of the battery core according to claim 1, wherein:

the first driving part is arranged at the bottom of the lower clamp body (1);

the power output end of the first driving part is connected with the auxiliary supporting body so as to drive the auxiliary supporting body to slide relative to the lower clamp body (1) and switch between the first position and the second position.

3. The lower clamp for the high-voltage resistance test of the battery cell of claim 1 or 2, which is characterized in that:

the auxiliary supporting body is provided with a plurality of supporting columns (2) which are arranged at intervals, and the supporting columns (2) penetrate through the lower clamp body (1);

the top surfaces of a plurality of support columns (2) jointly form the secondary bearing surface (201).

4. The lower clamp for the high voltage resistance test of the battery cell of claim 3, wherein:

the auxiliary supporting body is also provided with a connecting piece (202) connected between the supporting columns (2);

the connecting piece (202) is positioned below the lower clamp body (1).

5. The lower clamp for the high voltage resistance test of the battery cell of claim 1, wherein:

the qualified pressure of the high-pressure resistance test of the battery core is not lower than 50000N.

6. A test tool for testing high voltage resistance of a battery cell comprises a base (4), an upper clamp, a pressing part and a conductive piece (601), wherein the upper clamp is arranged on the base (4) in a sliding mode and provided with an upper clamp body (5), the pressing part is arranged on the base (4) and downwards pushes the upper clamp body (5), and the conductive piece (601) is connected with each lug (301) of the battery cell respectively; the method is characterized in that: the lower clamp for the high voltage resistance test of the battery cell is positioned below the upper clamp body (5) according to any one of claims 1 to 5;

due to the fact that the pushing of the pressing-down part is received, the extrusion surface at the bottom of the upper clamp body (5) can extrude the battery cell (3) on the battery cell (3) bearing surface.

7. The test tool for the high voltage resistance test of the cell of claim 6, wherein:

the pressing part adopts a servo motor (404);

the test tool for the high-voltage-resistant test of the battery cell further comprises a distance measuring sensor (407);

the distance measuring sensor (407) is used for measuring the distance between the extrusion surface and the bearing surface of the electric core (3).

8. The test tool for the high voltage resistance test of the cell of claim 6, wherein:

the conductive piece (601) is arranged on the upper clamp body (5) in a sliding mode through the second driving portion, and the conductive piece (601) is detachably connected to the power output end of the second driving portion.

9. The test tool for the high voltage resistance test of the cell of claim 6, wherein:

the upper clamp body (5) slides on the base (4) in a guiding manner, and an elastic piece is arranged between the upper clamp body (5) and the base (4).

10. The test tool for the high voltage resistance test of the cell of claim 6, wherein:

the lower clamp body (1) can be driven to slide along the base (4) and has a working position below the upper clamp body (5) and an initial position moved out of the position below the upper clamp body (5).

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