CN216526203U

CN216526203U - Battery test auxiliary device and battery test device

Info

Publication number: CN216526203U
Application number: CN202122962825.XU
Authority: CN
Inventors: 王磊; 陈少杰; 黄海强; 袁文森; 王志文; 杨红新
Original assignee: Svolt Energy Technology Wuxi Co Ltd
Current assignee: Svolt Energy Technology Wuxi Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-05-13
Anticipated expiration: 2031-11-29

Abstract

The utility model provides a battery test auxiliary device and a battery test device, wherein the battery test auxiliary device comprises a support body, an insulator, a pressure device and two leading-out ends, wherein the insulator is positioned on the support body, and an accommodating cavity is formed in the insulator to accommodate a cathode plate, an electrolyte membrane and an anode plate which are stacked together; the pressure device is provided with a movable top column which can be inserted into the containing cavity, the movable top column is provided with a top pressure end matched with the cross section area of the containing cavity so as to act on the positive plate or the negative plate elastically, and the movable top column can press and keep the body to be tested in the thickness direction; the two leading-out ends are insulated and isolated from each other and are respectively in electric contact with the positive plate and the negative plate, and electrodes of the positive plate and the negative plate are led out for testing. The auxiliary device for testing the battery can effectively solve the problem that the contact between the current collector of the battery and the top column is poor, and has good use stability.

Description

Battery test auxiliary device and battery test device

Technical Field

The utility model relates to the technical field of power battery testing, in particular to a battery testing auxiliary device. Meanwhile, the utility model also relates to a battery testing device applying the battery testing auxiliary device.

Background

The solid-state battery adopts non-flammable solid electrolyte to replace flammable organic liquid electrolyte, so that the safety of a battery system is greatly improved, and the synchronous improvement of energy density is realized. Among various new battery systems, solid-state batteries are the next-generation technology closest to the industry, which has become a consensus of the industry and the scientific community. The sulfide electrolyte has high lithium ion conductivity, the ion conductivity can reach 10 < -3 > to 10 < -2 > S/cm at room temperature, is close to or even exceeds that of an organic electrolyte, has the characteristics of high thermal stability, good safety performance and wide electrochemical stability window (more than 5V), and particularly has outstanding advantages in the aspects of high-power and high-low temperature solid batteries.

However, when the sulfide solid electrolyte is used to prepare the all-solid-state electric core system, the sulfide electrolyte belongs to ceramic materials, and the inside of the prepared soft package battery is in solid-solid contact, so that impedance is generated due to poor interface contact between electrolytes, between the electrolytes and a conductive agent, between the electrolytes and an active substance, between the conductive agent and the active substance, and between an electrode and an electrolyte membrane. Therefore, in the test or use of the all-solid-state battery, a certain pressure is usually applied to the outside of the battery to ensure the performance of the battery.

Before the all-solid-state battery is assembled into the soft package battery, the die battery screening material is used for assembling the half battery to test the positive electrode or the negative electrode, and the all-solid-state battery is assembled to test the battery performance.

At present, the diameter of metal columns at two ends of a mould is consistent, when a sample is tested, two poles of the assembled battery are propped in an insulating sleeve, the mould battery nut is locked for testing, and in the cycle test of the all-solid-state mould battery, because the expansion and contraction of a negative pole of the battery in the charging and discharging process and various side reactions, the contact between the metal prop and the current collectors at two poles of the battery is poor, even the locked mould battery is loosened, the internal resistance of the battery test is increased, the test result of the battery is poor, and the test characterization fails.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an auxiliary device for testing a battery, so as to improve the contact effect between a current collector of the battery and a top pillar, thereby improving the accuracy of the test result.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a battery test auxiliary device is used for stacking a negative plate, an electrolyte membrane and a positive plate of an all-solid-state battery together and forming a body to be tested for testing, and comprises a support body, an insulator, a pressure applying device and two leading-out ends, wherein:

the insulator is positioned on the support body, and an accommodating cavity is formed in the insulator to accommodate the stacked negative pole piece, the electrolyte membrane and the positive pole piece;

the pressing device is provided with a movable ejection column which can be inserted into the accommodating cavity, the movable ejection column is provided with an ejection end matched with the cross section area of the accommodating cavity, the ejection end can act on the body to be tested elastically and can press and hold the body to be tested in the thickness direction;

the two leading-out ends are insulated and isolated from each other and are respectively in electric contact with the positive plate and the negative plate, and electrodes of the positive plate and the negative plate are led out for testing.

Furthermore, the pressing device comprises a pressing plate positioned above the insulator and a fixed top pillar fixedly connected below the pressing plate, the movable top pillar is connected to the end part of the fixed top pillar, and an elastic part is arranged between the movable top pillar and the pressing plate.

Furthermore, the elastic part is a spring sleeved on the fixed top column, one end of the spring is arranged on the lower surface of the pressing plate in an overhead mode, and the other end of the spring is arranged on the upper end face of the movable top column in an overhead mode.

Furthermore, a plurality of screw rods are arranged on the circumference of the insulator, each screw rod penetrates through the support body and the pressure plate and is in threaded connection with a matched nut, and the height of the pressure plate is adjustable due to the screwing depth of the nut on the corresponding screw rod.

Further, the screw rod is connected with the support body in an insulating mode.

Further, a lower top column for supporting the negative plate or the positive plate is arranged on the supporting body;

the accommodating cavity is a through hole formed in the insulator along the vertical direction;

the movable top column and the lower top column are respectively inserted at two ends of the through hole.

Further, the support body and/or the pressing plate are in a long-strip plate shape, and the diameters of the movable top column and the lower top column are the same as the inner diameter of the through hole.

Further, the electrolyte membrane is configured to be formed by pressing the solid electrolyte powder located in the through hole through the movable top pillar and the lower top pillar, and is located in the through hole;

the positive plate and the negative plate are respectively placed from two ends of the through hole and are stacked on two sides of the electrolyte membrane.

Furthermore, the movable top column and the lower top column are made of conductive materials so as to form two leading-out ends matched with the positive plate and the negative plate.

Compared with the prior art, the utility model has the following advantages:

the battery test auxiliary device is provided with the support body, the insulator, the pressure device, the two leading-out ends, the movable ejection column with the ejection end matched with the cross section area of the accommodating cavity, and the movable ejection column which can elastically act on the body to be tested so as to tightly press the body to be tested in the thickness direction, so that the movable ejection column and the battery current collector have better contact effect, the problem that the contact between the battery current collector and the ejection column is poor due to expansion and shrinkage or side reaction and the like of the battery in the charging and discharging process can be effectively solved, the accuracy of battery test data is improved, and better test effect is achieved.

In addition, the elastic piece arranged between the movable ejection column and the pressing plate can be favorable for elastically pushing the movable ejection column to tightly press the body to be tested, and can prevent the pressing device from loosening under the action of elasticity. In addition, through the strip-shaped structure of the supporting body and the pressing plate, the structure is simple, the processing and the manufacturing are convenient, and the material can be saved, so that the manufacturing cost is lower.

Another object of the present invention is to provide a battery testing apparatus, which includes a testing circuit, and further includes the battery test auxiliary apparatus as described above, wherein the two terminals are electrically coupled to the testing circuit.

Compared with the battery test auxiliary device in the prior art, the battery test device has the same beneficial effects, and the details are not repeated herein.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic structural diagram of a battery test assisting apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a support according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an insulator according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an applicator according to an embodiment of the present invention;

FIG. 5 is a schematic view of a connection structure of a pressing plate and a fixed post according to an embodiment of the present invention;

description of reference numerals:

1. a support body; 101. a lower top pillar; 102. mounting holes;

2. an insulator; 201. a through hole;

3. pressing a plate; 301. fixing the top pillar; 302. moving the top pillar; 303. a fixing hole;

4. a screw; 5. a nut; 6. a spring; 7. and an insulating sleeve.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inside", "outside", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.

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

The embodiment firstly relates to a battery test auxiliary device, which is used for stacking a negative plate, an electrolyte membrane and a positive plate of an all-solid battery together and forming a body to be tested for testing.

In the overall structure, as shown in fig. 1, the auxiliary device for testing a battery mainly comprises a supporting body 1, an insulator 2, a pressure device and two leading-out terminals, wherein the insulator 2 is arranged on the supporting body 1, and an accommodating cavity is formed on the insulator 2 to accommodate the stacked negative electrode sheet, the electrolyte membrane and the positive electrode sheet.

The pressing device has a movable top pillar 302 which can be inserted into the accommodating cavity, and the movable top pillar 302 has a top pressing end which is matched with the cross section area of the accommodating cavity and can elastically act on the body to be tested so as to press the body to be tested in the thickness direction. The two leading-out ends are insulated and isolated from each other and are respectively in electric contact with the positive plate and the negative plate, and electrodes of the positive plate and the negative plate are led out for testing.

Through the structure, the movable top pillar 302 and the battery current collector have better contact effect, so that the problem that the contact between the battery current collector and the top pillar is poor due to expansion and contraction or side reaction of the battery in the charging and discharging process can be effectively solved, and the accuracy of battery test data is improved.

The above-mentioned top pressure end formed on the movable top pillar 302 matches with the cross-sectional area of the accommodating cavity, specifically, on the premise that the top pressure end can be smoothly inserted into the accommodating cavity, the outer contour of the top pressure end can abut against the inner wall of the accommodating cavity, for example, when the accommodating cavity is circular, the diameter of the top pressure end should be the same as the inner diameter of the accommodating cavity, so that the contact area of the top pressure end abutting against the pole piece can be increased.

Specifically, as shown in fig. 1 to 5, the battery test assisting apparatus of the present embodiment includes a support body 1, an insulator 2, a pressing device, and two terminals, as described above. The support body 1 is integrally long and is provided with a lower top column 101 in the middle of the support body 1, so that the insulator 2 can be conveniently inserted and positioned on the lower top column 101, the lower top column 101 is used for supporting a negative plate or a positive plate, and the lower top column 101 is matched with a movable top column 302 to improve the assembly effect of the negative plate, the electrolyte membrane and the positive plate which are stacked together.

Here, the electrolyte membrane of the present embodiment is configured to be formed by pressing the solid electrolyte powder in the through hole 201 through the movable top pillar 302 and the lower top pillar 101, and to be located in the accommodation chamber, that is, the through hole 201 described below, and the positive electrode tab and the negative electrode tab are specifically placed by the two ends of the through hole 201 and stacked on both sides of the electrolyte membrane, thereby forming the body to be tested.

It should be noted that, in addition to the above-mentioned structural shape, the support body 1 of the present embodiment may also be in other shapes, such as a rectangle, a triangle, or a circle, and in addition, a groove matching with the insulator 2 is provided on the support body 1, so that the insulator 2 may also be positioned on the support body 1, and in this case, the bottom of the groove is used for supporting the negative electrode plate or the positive electrode plate.

In addition, it should be noted that the object to be tested in the above description, that is, the negative electrode tab, the electrolyte membrane, and the positive electrode tab of the all-solid battery are stacked together and received in the receiving cavity. For specific implementation, the side of the body to be tested where the negative plate is located may correspond to the lower top pillar 101, and the side where the positive plate is located may correspond to the movable top pillar 302. Of course, the side of the body to be tested where the negative plate is located may be moved to correspond to the top pillar 302, and the side where the positive plate is located may be moved to correspond to the lower top pillar 101.

An exemplary structure of the insulator 2 of the present embodiment is shown in fig. 3, the insulator 2 is a cylindrical structure as a whole, and the receiving cavity is a through hole 201 formed in the insulator 2 in a vertical direction, that is, the through hole 201 is arranged along an axial direction of the insulator 2. In this embodiment, the through hole 201 is used for accommodating the stacked negative electrode sheet, electrolyte membrane and positive electrode sheet, and the lower top pillar 101 and the movable top pillar 302 are respectively inserted into two ends of the through hole 201, and press-fit the accommodated negative electrode sheet, electrolyte membrane and positive electrode sheet.

It is understood that the cross-sectional shape of the receiving cavity in the present embodiment may be square, rectangular, oval, polygonal, etc. besides circular. At this time, the shapes of the positive plate, the negative plate and the electrolyte membrane should be changed adaptively, and the accommodating cavity should be kept matched with the positive plate and the negative plate.

Of course, the insulator 2 may have a rectangular parallelepiped shape, a square shape, or the like, in addition to the columnar structure. In specific implementation, the insulator 2 may be made of any one of polyether ketone, ceramic, polytetrafluoroethylene, acrylic, and the like, so as to have a good insulating effect.

As shown in fig. 1 with reference to fig. 4 and 5, the pressing device of this embodiment includes a pressing plate 3 located above the insulator 2, and a fixed top pillar 301 fixedly connected below the pressing plate 3, a movable top pillar 302 connected to an end of the fixed top pillar 301, and an elastic member disposed between the movable top pillar 302 and the pressing plate 3.

Specifically, the pressing plate 3 of this embodiment is also in the form of a long strip plate, and the fixed top pillar 301 is fixedly connected to the lower end face of the pressing plate 3. The diameters of the movable top pillar 302 and the lower top pillar 101 are the same as the inner diameter of the through hole 201 in the insulator 2, so that the contact area with the body to be tested can be increased, press fitting can be better performed, and the accuracy of testing can be improved.

As shown in fig. 4, an exemplary structure of the movable top pillar 302 of this embodiment is that the movable top pillar 302 is a cylinder, and a blind hole is formed in the interior of the movable top pillar 302, the blind hole is used for being inserted into and connected with the end of the fixed top pillar 301, and relative to the end provided with the blind hole, the outer end face of the other end of the movable top pillar 302 forms the aforementioned top end, and the diameter of the top end is the same as the diameter of the through hole 201 on the middle insulator 2, so that a larger contact area is provided between the movable top pillar 302 and the positive plate or the negative plate, and the problem that the contact between the battery current collector and the top pillar is deteriorated due to expansion and contraction or secondary reaction of the battery during charging and discharging can be effectively improved, so as to maintain good contact, and to improve the accuracy of battery test data.

With continued reference to fig. 4, the fixed post 301 is inserted into the movable post 302, and in this case, as a preferred embodiment, the elastic member of this embodiment is a spring 6 sleeved on the fixed post 301, one end of the spring 6 is placed on the lower surface of the pressing plate 3, and the other end is placed on the upper end surface of the movable post 302. Through the structure, the movable top pillar 302 can elastically act on the body to be tested through the elastic force of the spring 6, so that the movable top pillar 302 can better abut against the positive pole piece or the negative pole piece.

It is worth mentioning here that the inner diameter of the spring 6 is equal to or larger than the outer diameter of the fixed top post 301, and the outer diameter of the spring 6 is equal to or smaller than the outer diameter of the movable top post 302, so that the end of the elastic member can be reliably placed on the movable top post 302. In addition, the length of the spring 6 is preferably 1.1 to 1.2 times of the length of the fixed top pillar 301, so that the effect of applying the pushing force to the movable top pillar 302 is facilitated. In addition, when the battery shrinks during charging and discharging, the movable top pillar 302 can avoid the poor contact between the movable top pillar 302 and the pole piece caused by the shrinkage of the battery under the action of the elastic force of the spring 6. Of course, the loosening of the pressing device described below can also be effectively prevented to some extent.

It should be noted that, in addition to the above-mentioned structure form, the movable top pillar 302 of the present embodiment may also adopt other structures, for example, a cylindrical structure is adopted as a whole, in this case, both ends of the spring 6 are correspondingly connected to the fixed top pillar 301 and the movable top pillar 302, so that the movable top pillar 302 can elastically act on the body to be tested.

In order to facilitate adjustment of the height of the pressure plate 3, in the present embodiment, two threaded rods 4 are provided in the circumferential direction of the insulator 2, that is, the two threaded rods 4 are symmetrically arranged with respect to the insulator 2. The two screws 4 penetrate through the support body 1 and the pressing plate 3 and are in threaded connection with the matched nuts 5, and the height of the pressing plate 3 can be adjusted by adjusting the screwing depth of the nuts 5 on the corresponding screws 4.

Specifically, as shown in fig. 1 to 5, the supporting body 1 is further provided with two mounting holes 102, the two mounting holes 102 are used for mounting the insulating sleeve 7 described below, and the two mounting holes 102 are symmetrically arranged about the lower support pillar 101. The pressing plate 3 is correspondingly provided with two fixing holes 303, the screw rods 4 on the bolts penetrate through the corresponding insulating sleeves 7 and the fixing holes 303 and are connected with the matched nuts 5 in a threaded manner, the heads of the bottom ends of the bolts abut against the supporting body 1, and the nuts 5 abut against the pressing plate 3.

Through the structure, when the height of the pressing plate 3 is adjusted to apply downward pressure to the body to be tested, the spring 6 is compressed under force and applies downward pushing force to the movable top pillar 302, so that the movable top pillar 302 is favorable for elastically acting on the body to be tested in the containing cavity, and the stable state can be well kept, and the use stability is good.

In this embodiment, the movable top pillar 302 and the lower top pillar 101 are made of conductive materials to form two leading-out terminals matched with the positive plate and the negative plate. Thus, the connection of an external test circuit can be facilitated. In order to facilitate the arrangement of the two leading-out terminals, the supporting body 1 and the pressing plate 3 in this embodiment are also made of a conductive material, and at this time, the two leading-out terminals can be the supporting body 1 and the pressing plate 3 respectively, so that the connection with an external conductive wire can be realized more easily, wherein the external conductive wire can be clamped on the supporting body 1 and the pressing plate 3 through structures such as an alligator clip.

In order to further improve the using effect of the auxiliary device for testing the battery, in this embodiment, the support body 1, the lower top pillar 101, the pressing plate 3, the fixed top pillar 301 and the sliding top pillar are all made of high-strength alloy steel, so that the auxiliary device can be not bent, collapsed and deformed under the pressure of 600Mpa, and has good using stability.

Because the support body 1, the pressing plate 3 and the sliding top column are made of conductive materials, in the embodiment, the screw rod 4 is in insulation connection with the support body 1. Specifically, as shown in fig. 1 and 2, the insulating bush 7 is fitted into the mounting hole 102 of the support body 1, and in the assembled state, the insulating bush 7 forms an insulating partition between the outer wall of the screw rod 4 and the mounting hole 102, and between the support body 1 and the head of the bolt. Wherein, the insulating sleeve 7 can specifically adopt any one of polyether ketone, polytetrafluoroethylene, acrylic and the like, so as to have better insulating effect.

It should be noted that the bolts in the present embodiment are all high-strength bolts, so as to have strong rigidity. In addition, the number of the bolts in the present embodiment can be adjusted according to specific requirements or specific shapes of the supporting body 1 and the pressing plate 3. In addition, the pressing force of the body to be tested in the assembling process can be adjusted adaptively according to specific use requirements, and the pressure maintaining machine can be used for maintaining pressure after the assembling is finished, so that the testing body can be tested conveniently.

When the auxiliary device for testing the battery in the embodiment is used, the following steps are adopted:

firstly, sleeving an insulator 2 on a lower top column 101 of a support body 1, then adding a proper amount of solid electrolyte powder into a through hole 201 of the insulator 2, and then pressurizing for 5-10 minutes at a pressure of 200-500 Mpa by using a movable top column 302, so that the electrolyte powder is pressed into an electrolyte sheet or an electrolyte membrane.

And step two, placing a positive plate or a negative plate at one side of the electrolyte sheet or the electrolyte membrane in the through hole 201 of the insulator 2. Taking the negative electrode plate as an example, after the negative electrode plate is inserted, the insulator 2 is inserted into the lower top pillar 101 of the support body 1, and the negative electrode plate is tightly pressed by the lower top pillar 101.

And step three, placing a positive plate on the other side of the electrolyte sheet or the electrolyte membrane in the insulator 2, and inserting the movable top column 302 into the through hole 201 to jack the positive plate tightly.

And step four, installing the pressing plate 3 pre-installed with the spring 6 on the movable ejection column 302, namely inserting the fixed ejection column 301 on the pressing plate 3 into the movable ejection column 302, maintaining the pressure for 5-10 minutes under the pressure of 100-500 Mpa, then installing a bolt, enabling the screw rod 4 to penetrate through the insulating sleeve 7 and the fixing hole 303, and then screwing the screw rod through the nut 5. At the moment, applying a tightening force according to actual needs, and then maintaining the pressure through a pressure maintaining machine;

and step five, connecting the positive electrode conducting wire to the positive electrode leading-out end, and connecting the negative electrode conducting wire to the negative electrode leading-out end, so as to lead out two leading-out ends.

The battery test auxiliary device of this embodiment not only can effectively improve because of the battery in charge-discharge in-process expansion and contraction or side reaction etc. lead to the problem of battery mass flow body and fore-set contact variation, but also has better stability in use to do benefit to the accuracy that improves battery test data, simple structure has simultaneously, the characteristics of the manufacturing of being convenient for, and also can save material, reduce manufacturing cost, have positive effect for promoting all solid-state battery research and development.

The embodiment also relates to a battery testing device, which comprises a testing circuit and the battery testing auxiliary device, wherein the two leading-out ends are electrically connected into the testing circuit. The battery testing device of the embodiment can improve the accuracy of the testing result by adopting the auxiliary device for testing the battery, and has better use effect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a battery test auxiliary device for with all solid-state battery's negative pole piece, electrolyte membrane and positive plate stack together and form the body that awaits measuring, for the test, its characterized in that, battery test auxiliary device includes supporter (1), insulator (2), pressure device and two terminals of drawing forth, wherein:

the insulator (2) is positioned on the support body (1), and an accommodating cavity is formed in the insulator (2) to accommodate the stacked negative pole piece, the electrolyte membrane and the positive pole piece;

the pressing device is provided with a movable top pillar (302) which can be inserted into the accommodating cavity, the movable top pillar (302) is provided with a top pressing end matched with the cross section area of the accommodating cavity, the top pressing end can act on the body to be tested in an elastic mode, and the body to be tested can be pressed and kept in the thickness direction;

2. The battery test aid of claim 1, wherein:

the pressing device comprises a pressing plate (3) located above the insulator (2) and a fixed top pillar (301) fixedly connected below the pressing plate (3), the movable top pillar (302) is connected to the end portion of the fixed top pillar (301), and an elastic piece is arranged between the movable top pillar (302) and the pressing plate (3).

3. The battery test aid of claim 2, wherein:

the elastic piece is a spring (6) sleeved on the fixed top column (301), one end of the spring (6) is arranged on the lower surface of the pressing plate (3) in an overhead mode, and the other end of the spring (6) is arranged on the upper end face of the movable top column (302) in an overhead mode.

4. The battery test aid of claim 2, wherein:

the insulator is characterized in that a plurality of screw rods (4) are arranged in the circumferential direction of the insulator (2), each screw rod (4) penetrates through the support body (1) and the pressing plate (3) and is in threaded connection with a matched nut (5), and the height of the pressing plate (3) is adjustable due to the screwing depth of the nut (5) on the corresponding screw rod (4).

5. The battery test aid of claim 4, wherein:

the screw rod (4) is connected with the support body (1) in an insulating way.

6. The battery test aid according to any one of claims 2 to 5, wherein:

a lower top column (101) for supporting the negative plate or the positive plate is arranged on the supporting body (1);

the accommodating cavity is a through hole (201) formed in the insulator (2) along the vertical direction;

the movable top pillar (302) and the lower top pillar (101) are respectively inserted into two ends of the through hole (201).

7. The battery test aid of claim 6, wherein:

the support body (1) and/or the pressing plate (3) are in a long-strip plate shape, and the diameters of the movable top column (302) and the lower top column (101) are the same as the inner diameter of the through hole (201).

8. The battery test aid of claim 6, wherein:

the electrolyte membrane is configured to be formed by pressing solid electrolyte powder located in the through hole (201) through the moving top pillar (302) and the lower top pillar (101), and is located in the through hole (201);

the positive plate and the negative plate are respectively placed from two ends of the through hole (201) and are stacked on two sides of the electrolyte membrane.

9. The battery test aid of claim 6, wherein:

the movable top pillar (302) and the lower top pillar (101) are made of conductive materials to form two leading-out ends matched with the positive pole piece and the negative pole piece.

10. A battery testing device comprises a testing circuit, and is characterized in that: further comprising the battery test aid of any one of claims 1 to 9, both of the terminals being electrically coupled in the test circuit.