CN113125959B - Battery test auxiliary device and test battery assembling method - Google Patents
Battery test auxiliary device and test battery assembling method Download PDFInfo
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- CN113125959B CN113125959B CN202110344700.2A CN202110344700A CN113125959B CN 113125959 B CN113125959 B CN 113125959B CN 202110344700 A CN202110344700 A CN 202110344700A CN 113125959 B CN113125959 B CN 113125959B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/364—Battery terminal connectors with integrated measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a battery test auxiliary device and a test battery assembly method, wherein the battery test auxiliary device comprises a support body, a lower insulator, an upper insulator, a pressure applying device and two leading-out ends; the lower insulator is arranged on the support body; a lower accommodating cavity matched with the double-sided negative plate is formed on the lower insulator to accommodate the stacked double-sided negative plate and the electrolyte membrane; the upper insulator is positioned above the lower insulator and is provided with a second positive electrode accommodating cavity matched with the other positive electrode plate; the pressing device acts on the double-sided pole piece to press and keep the double-sided pole piece in the thickness direction; the two leading-out ends are insulated and isolated from each other, form electric contact with the two positive plates respectively, and are led out from the two positive plates for testing. The auxiliary device for testing the battery can be used for conveniently assembling and testing the all-solid-state battery, and can effectively prevent the short circuit problem caused by the contact of the positive plate and the double-sided negative plate.
Description
Technical Field
The invention relates to the technical field of power battery testing, in particular to a battery testing auxiliary device; meanwhile, the invention also relates to a battery assembling method for testing.
Background
The sulfide electrolyte has higher lithium ion conductivity, and the ion conductivity is close to or even exceeds that of the organic electrolyte at room temperature. Meanwhile, the battery has the characteristics of high thermal stability, good safety performance and wide electrochemical stability window, and particularly has outstanding advantages in the aspects of high-power and high-low temperature solid batteries.
However, when the sulfide solid electrolyte is adopted to prepare the all-solid-state battery cell, the sulfide electrolyte belongs to ceramic materials, and the inside of the prepared soft package battery is in solid-solid contact. Therefore, the impedance is generated by the interface contact failure between the electrolyte itself, between the electrolyte and the conductive agent, between the electrolyte and the active material, between the conductive agent and the active material, or between the electrode and the electrolyte membrane. Based on this, in the test or use of the all-solid-state battery, in order to ensure the performance of the battery, a certain pressure is usually applied to the outside of the battery. At present, the sulfide all-solid-state battery is still in a rapid research and development stage, the mold battery used in the test is uniform in diameter of metal columns at two ends of the mold, when a sample is tested, an electrolyte membrane is formed by pressing electrolyte dry powder in an insulating sleeve, the electrolyte membrane is thick (millimeter or submillimeter level), and the electrolyte membrane is formed by membrane pressing under a high-pressure condition, the edge of the electrolyte membrane is extruded and supported by the inner wall of the sleeve, seamless contact is realized, no matter the anode layer and the cathode layer are pressed by dry powder, or the electrolyte membrane is formed by using a wet coating punching sheet, and the assembled mold battery generally cannot be short-circuited under high pressure.
The method for assembling the all-solid-state soft package is further promoted on the basis of the research of the die battery to use the method for assembling the all-solid-state soft package to test the performance of the soft package system, the general assembly of the sulfide all-solid-state soft package needs to be carried out in a glove box or under a high dew point condition, the assembly process is complex, the efficiency is low, and the cost of the sulfide electrolyte is higher at present, so that the waste of the cost of time, materials, manpower, equipment and the like can be caused when the soft package battery is directly assembled to test the performance for certain immature systems.
When the performance of the die battery is tested by simulating a soft package battery by using each part of the soft package battery, an independent electrolyte membrane is prepared by wet coating or dry rolling, and a positive plate and a negative plate are respectively placed on two sides of the electrolyte membrane. Due to the fact that the structural design of the testing device is unreasonable, and the electrolyte membrane is thin, under the conditions of medium pressure and high pressure, the positive current collector and the negative current collector are irregularly stretched and contacted, and therefore the battery is short-circuited. In addition, under high shear force, the edges of the electrolyte membrane and the negative plate are easy to lift, and the short circuit of the battery can also be caused.
Disclosure of Invention
In view of the above, the present invention is directed to a battery test assisting device for assembling and testing an all-solid-state battery, and effectively preventing the occurrence of short circuit during testing.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a battery test auxiliary device is used for stacking a double-sided negative plate, an electrolyte membrane and two positive plates of an all-solid-state battery into the double-sided negative plate and keeping the double-sided negative plate and the electrolyte membrane for testing, and comprises:
a support body;
a lower insulator disposed on the support body; a lower accommodating cavity matched with the double-sided negative pole pieces is formed on the lower insulator to accommodate the stacked double-sided negative pole pieces and the electrolyte membranes arranged on the upper and lower surfaces of the double-sided negative pole pieces respectively; a first positive electrode accommodating cavity communicated with the lower accommodating cavity is formed in the lower insulator below the lower accommodating cavity so as to match and accommodate one of the two positive electrode sheets contacting with the lower surface of the electrolyte membrane;
an upper insulator located above the lower insulator; a second positive electrode accommodating cavity matched with the other positive electrode plate is formed on the upper insulator to accommodate the other positive electrode plate and keep the positive electrode plate in contact with the upper surface of the electrolyte membrane;
the pressing device acts on the double-sided pole piece to press and hold the double-sided pole piece in the thickness direction;
and the two leading-out ends are insulated and isolated from each other, form electric contact with the two positive plates respectively, and are led out from the two positive plates for testing.
Further, the upper insulator is inserted into the lower accommodating cavity from the top of the lower insulator in an inserting mode and is pressed on the upper surface of the electrolyte membrane above the double-sided negative pole piece.
Further, the second positive electrode accommodating cavity is a through hole formed in the upper insulator along the vertical direction; the pressure device comprises a top plate and an upper top column, wherein the top plate is positioned above the upper insulator and is adjustable in height, and the upper top column is fixedly connected below the top plate and is inserted into the second anode containing cavity from the upper side of the upper insulator; and adjusting the height of the top plate to adjust the downward pressure of the upper top column pressing the positive plate.
Furthermore, a spring is sleeved on the upper top column, one end of the spring is arranged on the lower surface of the top plate in an overhead mode, and the other end of the spring is arranged on the upper surface of the upper insulator in an overhead mode.
Furthermore, the upper top column is made of a conductive material so as to form the leading-out end matched with the positive plate.
Furthermore, a plurality of screw rods are arranged on the circumference of the upper insulator, each screw rod penetrates through the support body and the top plate in the vertical direction, and the height of the top plate is adjusted based on the screwing depth of a nut matched with the screw rod.
Further, the lower accommodating cavity and the first positive electrode accommodating cavity are stepped through holes formed in the lower insulator along the vertical direction; the pressure device comprises a lower top column arranged on the support body, the lower top column is inserted into the first positive electrode accommodating cavity from the bottom of the lower insulator and supports the positive electrode plate.
Further, the lower top pillar is made of a conductive material to form the leading-out end matched with the positive plate.
Compared with the prior art, the invention has the following advantages:
according to the auxiliary device for testing the battery, the lower containing cavity matched with the double-sided negative plate, the first positive containing cavity matched with one positive plate and the second positive containing cavity matched with the other positive plate are arranged on the lower insulator, so that the double-sided pole pieces can be assembled conveniently, and meanwhile, the short circuit problem in the testing process can be effectively prevented; the pressure applying device is arranged to compress the test body, so that a double-sided pole piece with high compaction density can be obtained; the two leading-out ends are respectively in electrical contact with the positive plate and the negative plate, so that the double-sided pole piece can be tested conveniently; the auxiliary device for testing the battery is also beneficial to improving the testing precision and the testing efficiency.
Another objective of the present invention is to provide a method for assembling a battery for testing, in which two positive plates of an all-solid battery are respectively disposed on the upper and lower surfaces of a double-sided negative plate compounded with an electrolyte membrane, and are stacked into a double-sided plate and held for testing, the method comprising the steps of:
step one, obtaining a double-sided negative plate compounded with an electrolyte membrane and two positive plates;
step two, the double-sided negative plate and the electrolyte membrane are accommodated in a lower accommodating cavity corresponding to the shape of the double-sided negative plate;
step three, one of the two positive electrode plates is accommodated in a first positive electrode accommodating cavity which is communicated with the lower accommodating cavity and has a shape corresponding to that of the positive electrode plate, so that the positive electrode plate is in contact with the lower surface of the electrolyte membrane;
step four, accommodating the other positive electrode sheet in a second positive electrode accommodating cavity corresponding to the shape of the positive electrode sheet, and contacting the positive electrode sheet with the upper surface of the electrolyte membrane;
pressing the double-sided pole pieces in the thickness direction through a pressing device and keeping the double-sided pole pieces so that the upper surface and the lower surface of the double-sided negative pole piece are pressed by the two positive pole pieces with preset pressing force;
and step six, arranging two leading-out ends which are insulated and isolated from each other so as to be electrically contacted with the two positive plates and lead out for testing.
Further, the radial cross-sectional area of the first positive electrode accommodating cavity and/or the second positive electrode accommodating cavity is smaller than that of the lower accommodating cavity.
According to the test battery assembly method, the double-sided negative plate compounded with the electrolyte membrane is accommodated in the lower accommodating cavity, the two positive plates are respectively placed in the first positive accommodating cavity and the second positive accommodating cavity, and the double-sided negative plate can be assembled under the action of the pressure device; meanwhile, the lead-out end is arranged, so that the assembled double-sided pole piece can be tested, the battery assembling method for testing can realize the assembly and the test of the all-solid-state battery, and has a better testing effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a battery test assisting apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a support and a lower insulator according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a lower insulator according to a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a pressing device and an upper insulator according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a pressing device, an upper insulator and a spring according to a first embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for assembling a test battery according to a second embodiment of the present invention; description of reference numerals:
1. a support body; 101. a lower top pillar; 102. a first mounting hole; 103. an insulating sleeve;
2. a top plate; 201. mounting a top pillar; 202. a second mounting hole;
3. a spring;
4. an upper insulator; 401. a second positive electrode accommodating chamber;
5. a lower insulator; 501. a lower receiving chamber; 502. a first positive electrode accommodating chamber;
6. a screw;
7. and a nut.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention 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 to be construed as indicating or implying any particular importance.
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. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art 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.
Example one
The embodiment relates to a battery test auxiliary device, which is used for stacking a double-sided negative plate, an electrolyte membrane and two positive plates of an all-solid-state battery into a double-sided plate and keeping the double-sided plate for testing. The auxiliary device comprises a supporting body, a lower insulator, an upper insulator, a pressure applying device and two leading-out ends.
Wherein, the lower insulator in the embodiment is arranged on the support body; a lower accommodating cavity matched with the double-sided negative plate is formed on the lower insulator to accommodate the double-sided negative plate and the electrolyte membrane; and a first positive electrode accommodating cavity communicated with the lower accommodating cavity is formed in the lower insulator below the lower accommodating cavity so as to accommodate one of the two positive electrode plates in contact with the lower surface of the double-sided negative electrode plate.
And the upper insulator is positioned above the lower insulator, and a second positive electrode accommodating cavity matched with the other positive electrode plate is formed on the upper insulator so as to accommodate the other positive electrode plate and keep the positive electrode plate in contact with the upper surface of the electrolyte membrane. In addition, a pressing device acts on the double-sided pole piece to press and hold the double-sided pole piece in the thickness direction. Meanwhile, the two leading-out ends are insulated and isolated from each other, form electric contact with the two positive plates respectively, and are led out from the two positive plates for testing.
Based on the above design concept, an exemplary structure of the battery test assisting apparatus described in the present embodiment is shown in fig. 1. For the sake of distinction, in the present embodiment, the electrolyte membrane located below the double-sided negative electrode sheet is referred to as a first electrolyte membrane, and the electrolyte membrane located above the double-sided negative electrode sheet is referred to as a second electrolyte membrane. The positive electrode sheet housed in the first positive electrode housing chamber 502 is referred to as a first positive electrode sheet, and the positive electrode sheet housed in the second positive electrode housing chamber 401 is referred to as a second positive electrode sheet.
The double-sided negative electrode sheet in this embodiment may be manufactured by wet coating or dry rolling; the electrolyte membrane is prepared by wet coating or dry rolling, and compared with a test material adopting sulfide electrolyte, the electrolyte membrane is beneficial to saving the assembly cost of the double-sided pole piece and reducing the generation of pollutants in the test. In addition, the first electrolyte membrane and the second electrolyte membrane can be compounded on the upper surface and the lower surface of the double-sided negative plate by adopting a mature method in the prior art.
In this embodiment, referring to fig. 2, the structure of the lower insulator 5 and the support body 1, the lower receiving cavity 501 and the first positive electrode receiving cavity 502 on the lower insulator 5 are stepped through holes formed in the lower insulator 5 in the vertical direction. As shown in fig. 3, the radial sectional area of the lower receiving chamber 501 is larger than that of the first positive electrode receiving chamber 502. So set up, the equipment negative pole piece area of being convenient for is big, and the two-sided pole piece that the positive plate area is little, and its battery performance more approaches laminate polymer battery.
In addition, the structure of the stepped through hole can position the double-sided negative plate, and space is provided for placing the first positive plate and the second negative plate. Meanwhile, the stepped channel is convenient to machine and form, and when the double-sided negative plate, the first electrolyte membrane and the second electrolyte membrane are tightly pressed, the stepped through hole can also play a certain restraint effect.
Preferably, the radial cross section of the lower accommodating chamber 501 and the first positive electrode accommodating chamber 502 in the present embodiment is circular, and the shape and area thereof are the same as those of the double-sided negative electrode sheet and the two electrolyte membranes so as to match the double-sided negative electrode sheet. For the convenience of processing, the outer wall of the lower insulator 5 is also cylindrical in this embodiment.
It is understood that the radial cross-sectional shapes of the lower receiving chamber 501 and the first positive electrode receiving chamber 502 in the present embodiment may be square, rectangular, oval, polygonal, or the like, in addition to the circular shape. However, the shape of the double-sided negative electrode sheet and the two electrolyte membranes should be adapted to the change as long as it is ensured that the lower receiving cavity 501 and the double-sided negative electrode sheet remain matched.
Of course, the outer wall of the lower insulator 5 may have a rectangular parallelepiped shape, a square shape, or the like, in addition to the columnar shape. In specific implementation, the lower insulator 5 may be made of any one of polyether ketone, ceramic, polytetrafluoroethylene, acrylic, and the like, so as to have a better insulating effect.
With continued reference to fig. 2, the support body 1 in the present embodiment, which serves as a load-bearing base body for the lower insulator 5, is circular in shape as a whole. The pressing means in this embodiment includes a lower top post 101 provided on the support body 1, and the lower top post 101 is inserted into the first positive electrode receiving chamber 502 from the bottom of the lower insulator 5 to support the first positive electrode tab.
Wherein the lower top pillar 101 is located at the center of the support body 1. The diameter of the lower top pillar 101 is consistent with that of the first positive electrode accommodating cavity 502, so that the first positive electrode plate is placed in the first positive electrode accommodating cavity 502, the positioning of the lower insulator 5 on the support body 1 can be facilitated, and the double-sided electrode plate can be pressed from the bottom.
The upper insulator 4 in this embodiment is inserted in the lower receiving chamber 501 from the top of the lower insulator 5 in the form of an insert, and is pressed against the upper surface of the second electrolyte membrane. Here, through the insertion of the upper insulator 4 in the lower accommodating cavity 501 and the pressing and releasing of the upper surface of the second electrolyte membrane, the assembly and the test of the double-sided pole piece with the negative pole piece larger than the positive pole piece can be realized, so that the assembled double-sided pole piece is close to the soft package battery. In specific implementation, the upper insulator 4 may be made of any one of polyether ketone, ceramic, teflon, acrylic, and the like, so as to have a good insulating effect.
The upper insulator 4 of this embodiment is structured as shown in fig. 4, and the second positive electrode receiving chamber 401 is a through hole formed in the upper insulator 4 in the vertical direction. The structure is simple, the design and implementation are convenient, and the placement of the second positive plate can be guided. Meanwhile, the through hole in the upper insulator 4 is beneficial to the placement of the positive plate at the center of the double-sided negative plate, so that the consistency and stability of the positive plate in the assembling process are improved.
In addition, the edges of the double-sided negative plate and the electrolyte membrane are pressed by the bottom end of the upper insulator 4, so that the electrolyte membrane and the edges of the double-sided negative plate can be effectively prevented from tilting, and the problem of short circuit of the double-sided negative plate is further avoided. In this embodiment, the corresponding diameter of the outer wall of the upper insulator 4 is adapted to the diameter of the first positive electrode accommodating chamber 502, so as to ensure the insertion effect of the upper insulator 4 in the lower accommodating chamber 501.
It should be noted that the upper insulator 4 in the present embodiment may be disposed to protrude from the lower insulator 5 as shown in fig. 1, or may be entirely housed in the lower housing chamber 501. As long as the assembly requirements of the positive electrode tab can be satisfied and the bottom end of the spring 3 described below can abut against the upper surface of the upper insulator 4.
The pressing device in this embodiment further includes a top plate 2 with adjustable height above the upper insulator 4, a top plate 2 with adjustable height fixedly connected below the top plate 2 and above the upper insulator 4, and an upper top pillar 201 fixedly connected below the top plate 2 and inserted into the second positive electrode accommodating cavity 401 from above the upper insulator 4; the height of the top plate 2 is adjusted to adjust the downward pressure of the upper top column 201 pressing the second positive plate.
As shown in fig. 4, the top plate 2 in this embodiment has a circular shape, and the upper top pillar 201 is located at the center of the top. Preferably, the diameter of the upper stem 201 in the present embodiment is the same as the diameter of the second positive electrode receiving chamber 401. Therefore, when the upper top column 201 presses the positive plate downwards, the downward pressure can be uniformly applied to the whole positive plate, and the improvement of the testing precision is facilitated.
In order to facilitate adjustment of the height of the top plate 2, as shown in fig. 1 to 3, four bolts are provided on the circumference of the upper insulator 4, a screw 6 on each bolt penetrates the support body 1 and the top plate 2 in the vertical direction, and the height of the top plate 2 is adjusted based on the screwing depth of a nut 7 matched with the screw 6. In specific implementation, the four screws 6 are arranged around the upper insulator 4 at equal intervals in the circumferential direction, so that the uniformity and stability in the force application process are improved. Of course, the number of bolts in the present embodiment can be adjusted according to specific use requirements. In order to facilitate the installation of the screws 6, four first installation holes 102 are provided in the support body 1, and four second installation holes 202 are provided in the top plate 2. The screw 6 passes through the first mounting hole 102 and the second mounting hole 202 in sequence and then is connected with the nut 7 in a threaded manner. The head of the bottom end of each bolt is ensured to be abutted against the support body 1, and the nut 7 is abutted against the top plate 2. In addition, the bolt in the embodiment adopts a high-strength bolt, so that the service life is prolonged. It can be understood that the pressing force applied during the assembly process of the testing body can be adaptively adjusted according to specific use requirements, and the pressure maintaining machine can be used for maintaining the pressure after the assembly is completed, so as to test the testing body conveniently. As shown in fig. 1 and 5, in the present embodiment, the spring 3 is fitted over the upper top pillar 201, and one end of the spring 3 is placed on the lower surface of the top plate 2 and the other end is placed on the upper surface of the upper insulator 4. So configured, when the height of the top plate 2 is adjusted to apply a downward pressure to the second positive plate, the spring 3 can be compressed by a force and apply a downward pushing force to the upper insulator 4, so as to facilitate the maintenance of the upper insulator 4 in the inserted state in the lower receiving cavity 501, and have better stability in use. In addition, the inner diameter of the spring 3 is larger than or equal to the diameter of the upper support pillar 201, so that the spring can be sleeved on the upper support pillar 201 and can be compressed and reset. The length of the spring 3 is preferably 1.1-1.2 times of the length of the upper top column 201, so that the effect of applying a jacking force to the upper insulator 4 is facilitated. The upper top pillar 201 in this embodiment is made of a conductive material to form the above-mentioned terminal matched with the second positive electrode tab. The lower top pillar 101 is made of a conductive material to form the above-mentioned terminal to be matched with the first positive electrode tab. For the sake of distinction, in the present embodiment, the lead-out terminal in electrical contact with the first positive electrode tab is referred to as a first lead-out terminal, and the lead-out terminal in electrical contact with the second positive electrode tab is referred to as a second lead-out terminal.
In order to facilitate the arrangement of the first lead-out terminal and the second lead-out terminal, the top plate 2 and the support body 1 in this embodiment are also made of a conductive material, in this case, the first lead-out terminal is the top plate 2, and the second lead-out terminal is on the support body 1. The support body 1 and the top plate 2 have large areas, so that the connection with an external conducting wire is easier to realize. The external conductive wire can be connected to the top plate 2 and the supporting body 1 through a clamping structure such as an adhesive tape or an alligator clip.
It is understood that the first and second terminals in this embodiment may also be protrusions respectively disposed on the top plate 2 and the support plate to facilitate connection of the two to the conductive wire. In the specific embodiment, the top plate 2 and the upper top pillar 201 are made of the same material, and the support body 1 and the lower top pillar 101 are made of the same material, and both are preferably integrally formed.
In order to further improve the using effect of the auxiliary device for testing the battery, in the embodiment, the supporting body 1 and the lower top pillar 101, the top plate 2 and the upper top pillar 201 are all made of high-strength alloy steel, so that the structure is not deformed, collapsed and bent during the using process, and has better using stability.
Considering that the support body 1 and the top plate 2 are both made of conductive materials, in this embodiment, the screw 6 and the support body 1 are connected in an insulating fit manner. In particular, with continued reference to fig. 1, an insulating sleeve 103 is fitted inside each first mounting hole 102, and in the assembled state, the insulating sleeve 103 forms an insulating separation between the outer wall of the screw 6 and the first mounting hole 102, and between the support body 1 and the head of the bolt.
It should be noted that the top plate 2 and the supporting body 1 in this embodiment may also be made of insulating materials, and in this case, in order to facilitate the connection between the first and second terminals and the external conductive wires, a first annular protrusion arranged circumferentially is provided on the outer periphery of the bottom of the lower top pillar 101, and the bottom surface of the lower insulator 5 inserted into the lower top pillar 101 abuts against the first annular protrusion. At this time, the first annular protrusion is the first leading-out terminal. The top of the upper top pillar 201 is provided with a second annular protrusion arranged in the circumferential direction of the ring, the top end of the spring 3 abuts against the lower surface of the second annular protrusion, and at this time, the second annular protrusion constitutes a second leading-out end.
According to the auxiliary device for testing the battery, the lower accommodating cavity 501 matched with the double-sided negative plate, the first positive electrode accommodating cavity 502 matched with one positive plate and the second positive electrode accommodating cavity 401 matched with the other positive plate are arranged on the lower insulator 5, so that the double-sided plates can be conveniently assembled, and meanwhile, the short circuit problem in the testing process can be effectively prevented; the pressure device is arranged to compress the test body, so that a double-sided pole piece with high compaction density can be obtained; the two leading-out ends are respectively in electric contact with the positive plate and the negative plate, so that the double-sided pole piece can be tested; the auxiliary device for testing the battery is also beneficial to improving the testing precision and the testing efficiency.
In addition, the performance of the double-sided pole piece assembled by the auxiliary device for battery testing is closer to that of a soft package battery, and the auxiliary device has a higher reference value for the design of a solid-state battery.
Example two
The embodiment also relates to a test battery assembly method, which is used for respectively arranging the two positive plates of the all-solid-state battery on the upper surface and the lower surface of the double-sided negative plate compounded with the electrolyte membrane, stacking the positive plates into the double-sided plates and keeping the double-sided plates for testing, and comprises the following steps of:
step one, obtaining a double-sided negative plate and two positive plates which are compounded with an electrolyte membrane;
step two, the double-sided negative plate and the electrolyte membrane are accommodated in a lower accommodating cavity 501 corresponding to the shape of the double-sided negative plate;
step three, one of the two positive electrode plates is accommodated in a first positive electrode accommodating cavity 502 which is communicated with the lower accommodating cavity 501 and has a shape corresponding to the shape of the positive electrode plate, so that the positive electrode plate is in contact with the lower surface of the electrolyte membrane;
step four, accommodating another positive electrode plate in a second positive electrode accommodating chamber 401 corresponding to the shape of the positive electrode plate, and bringing the positive electrode plate into contact with the upper surface of the electrolyte membrane;
pressing the double-sided pole pieces in the thickness direction by a pressing device and keeping the double-sided pole pieces so that the two positive pole pieces are pressed by the upper surface and the lower surface of the double-sided negative pole piece at preset pressing force;
and step six, arranging two leading-out ends which are insulated and isolated from each other so as to be electrically contacted with the two positive plates and lead out for testing.
As shown in fig. 6, in step one of the present embodiment, the double-sided negative electrode sheet can be prepared by using a wet coating or dry rolling process in the prior art. The double-sided negative plate and an electrolyte membrane prepared by adopting a wet coating or dry rolling process are subjected to isostatic pressing integrated compounding, so that the double-sided negative plate compounded with the electrolyte membrane is obtained. Alternatively, the electrolyte membrane may be directly applied to the double-sided negative electrode sheet and then subjected to isostatic pressing, whereby a double-sided negative electrode sheet having the electrolyte membrane incorporated therein can be obtained. Preferably, the positive electrode sheet in the present embodiment is also manufactured by a wet coating or dry rolling process.
And (3) punching the double-sided negative plate compounded with the electrolyte membrane and the positive plate by using a punching machine to obtain the double-sided negative plate and the positive plate compounded with the electrolyte membrane in the step one.
For convenience of description, in the present embodiment, the electrolyte membrane located on the upper surface of the double-sided negative electrode sheet is referred to as an upper electrolyte membrane, and the electrolyte membrane located on the lower surface of the double-sided negative electrode sheet is referred to as a lower electrolyte membrane.
In the second step of the present embodiment, the double-sided negative electrode sheet in this step is a punched double-sided negative electrode sheet to which the electrolyte membrane is laminated, and is housed in the lower housing cavity corresponding to the shape of the double-sided negative electrode sheet. The double-sided negative plate compounded with the electrolyte membrane is punched into a certain shape, and the radial cross section of the cavity corresponding to the shape of the double-sided negative plate is also the lower accommodating cavity, so that the effect of assembling the double-sided negative plate into the solid-state battery is improved. Of course, when the double-sided negative plate is punched into other shapes, the radial cross-sectional shape and the specification adaptability of the lower accommodating cavity can be changed.
In the third step of this embodiment, the shape and specification of the positive electrode tab are consistent with the radial cross-sectional shape and specification of the corresponding positive electrode tab receiving cavity. For convenience of description, in this embodiment, the positive electrode sheet located on the upper surface of the upper electrolyte membrane is referred to as a first positive electrode sheet, and the positive electrode sheet located on the lower surface of the electrolyte membrane is referred to as a second positive electrode sheet. In the third step, the first positive electrode sheet is accommodated in the first positive electrode accommodating chamber. In step four, the second positive electrode tab is received in the second positive electrode tab receiving cavity.
In this embodiment, by accommodating the first positive electrode tab and the second positive electrode tab in the first positive electrode tab accommodating chamber and the second positive electrode tab accommodating chamber, the first positive electrode tab and the second positive electrode tab can be placed on the upper electrolyte membrane and the lower electrolyte membrane, respectively, to be guided. Meanwhile, the first positive plate and the second positive plate can have better performance and consistency in the fifth step.
In the fifth implementation, in order to improve the compressing effect of the pressing device on the double-sided pole piece, the structure for applying force to the first positive pole piece and the second positive pole piece may adopt a force application portion correspondingly arranged in the first positive pole piece accommodating cavity and the second positive pole piece accommodating cavity. For example, when the positive electrode sheet is circular, the radial transverse cross section of the urging portion provided correspondingly is also circular, and the specification coincides with the cross sectional specification of the first positive electrode accommodating chamber.
Because the two-sided negative pole piece receives the restraint that holds the chamber down, first positive plate and second positive plate receive the restraint that first positive plate held the chamber and the chamber is held to the second positive plate for the warpage can not take place for the electrolyte membrane on the two-sided negative pole piece in step five, and then prevents the emergence of two-sided pole piece short circuit problem when testing. In addition, the double-sided battery is pressed in the thickness direction of the double-sided battery through the pressing device, so that the compaction density of the double-sided battery is improved, and the double-sided battery has better performance.
In the sixth step, the leading-out terminals on the two positive plates should be conveniently connected with external wires so as to test the double-sided plates.
It should be noted here that in the present embodiment, the radial cross-sectional areas of the first positive electrode accommodating chamber and the second positive electrode accommodating chamber are equal, and both are smaller than the radial cross-sectional area of the lower accommodating chamber. By the arrangement, the double-sided battery with the small positive plate and the large negative plate convenient to manufacture is more suitable for the soft package battery. It can be understood that when the radial cross-sectional areas of the first positive electrode containing cavity and the second positive electrode containing cavity are equal to the radial cross-sectional area of the double-sided negative electrode plate, the double-sided negative electrode plate with the negative electrode plate and the positive electrode plate having opposite areas can be prepared. And when the radial cross-sectional area of only one of the first positive electrode containing cavity and the second positive electrode containing cavity is smaller than the radial cross-sectional area of the double-sided negative electrode piece, the double-sided negative electrode piece can be prepared. In specific implementation, the determination can be carried out according to the use requirement.
The steps two to six in the battery assembling method for testing in the embodiment can be applied to the auxiliary device for testing the battery in the embodiment one, so that the double-sided pole piece is assembled. Specifically, referring to fig. 1 to 5, in the second step, the double-sided negative electrode sheet combined with the electrolyte membrane is accommodated in the lower accommodation cavity 501 of the lower insulator 5.
In the third step, the upper insulator 4 is inserted into the lower receiving cavity 501, and then the first positive electrode tab is placed in the first positive electrode receiving cavity 502. In step four, a second positive electrode sheet is placed into the second positive electrode receiving cavity 401. In the fifth step, the lower support pillar 101 is inserted into the first positive electrode accommodating cavity 502, and the upper support pillar 201 sleeved with the spring 3 is inserted into the second positive electrode accommodating cavity; next, four insulating sleeves 103 are respectively installed in the first mounting holes 102, four bolts are installed and the nuts 7 are tightened, and pressure holding is performed by a pressure holding machine. And step six, connecting two conductive wires to the first leading-out end and the second leading-out end. According to the method for assembling the battery for testing, the double-sided negative plate is accommodated in the lower accommodating cavity 501, the two positive plates are respectively placed in the first positive accommodating cavity 502 and the second positive accommodating cavity 401, and the double-sided negative plate can be assembled under the action of the pressure applying device; meanwhile, the assembled double-sided pole piece is favorably tested by arranging the leading-out end, and the battery assembling method for testing can realize the assembly and the test of the all-solid-state battery and has better reference value.
In addition, compared with the traditional method for preparing the all-solid-state battery by adopting the sulfide electrolyte, the battery assembling method for testing has the advantages of low cost, low pollution, low operation difficulty and good consistency of the double-sided battery.
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 invention, 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 (10)
1. The utility model provides a battery test auxiliary device for double-sided negative pole piece, electrolyte membrane and two positive plates of all solid-state batteries stack into double-sided pole piece and keep, for the test, this auxiliary device of its characterized in that includes:
a support body (1);
a lower insulator (5) provided on the support body (1); a lower accommodating cavity (501) matched with the double-sided negative pole pieces is formed on the lower insulator (5) so as to accommodate the stacked double-sided negative pole pieces and the electrolyte membranes arranged on the upper and lower surfaces of the double-sided negative pole pieces respectively; a first positive electrode accommodating cavity (502) communicated with the lower accommodating cavity (501) is formed in the lower insulator (5) below the lower accommodating cavity (501) so as to match and accommodate one of the two positive electrode sheets contacted with the lower surface of the electrolyte membrane;
an upper insulator (4) located above the lower insulator (5); a second positive electrode accommodating cavity (401) matched with the other positive electrode plate is formed on the upper insulator (4) so as to accommodate the other positive electrode plate and keep the positive electrode plate in contact with the upper surface of the electrolyte membrane;
the pressing device acts on the double-sided pole piece to press and hold the double-sided pole piece in the thickness direction;
and the two leading-out ends are insulated and isolated from each other, form electric contact with the two positive plates respectively, and are led out from the two positive plates for testing.
2. The battery test aid according to claim 1, wherein: the upper insulator (4) is inserted into the lower accommodating cavity (501) from the top of the lower insulator (5) in an inserting mode and is pressed on the upper surface of the electrolyte membrane above the double-sided negative pole piece.
3. The battery test aid of claim 2, wherein: the second positive electrode receiving cavity (401) is a through hole formed in the upper insulator (4) in a vertical direction; the pressing device comprises a top plate (2) which is positioned above the upper insulator (4) and is adjustable in height, and an upper top column (201) which is fixedly connected below the top plate (2) and is inserted into the second positive electrode containing cavity (401) from above the upper insulator (4); the height of the top plate (2) is adjusted to adjust the downward pressure of the upper top column (201) for pressing the positive plate.
4. The battery test aid of claim 3, wherein: the upper top column (201) is sleeved with a spring (3), one end of the spring (3) is arranged on the lower surface of the top plate (2) in an overhead mode, and the other end of the spring (3) is arranged on the upper surface of the upper insulator (4) in an overhead mode.
5. The battery test aid of claim 3, wherein: the upper top column (201) is made of conductive materials so as to form the leading-out end matched with the positive pole piece.
6. The battery test aid of claim 3, wherein: a plurality of screw rods (6) are arranged in the circumferential direction of the upper insulator (4), each screw rod (6) penetrates through the support body (1) and the top plate (2) in the vertical direction, and the height of the top plate (2) is adjusted based on the screwing depth of a nut (7) matched with the screw rod (6).
7. The battery test aid according to any one of claims 1 to 6, wherein: the lower accommodating cavity (501) and the first positive electrode accommodating cavity (502) are stepped through holes formed in the lower insulator (5) in the vertical direction; the pressing device comprises a lower top column (101) arranged on the supporting body (1), and the lower top column (101) is inserted into the first positive electrode accommodating cavity (502) from the bottom of the lower insulator (5) and supports the positive electrode plate.
8. The battery test aid of claim 7, wherein: the lower top column (101) is made of conductive materials so as to form the leading-out end matched with the positive pole piece.
9. A method for assembling a test battery, which respectively arranges two positive plates of an all-solid-state battery on the upper and lower surfaces of a double-sided negative plate compounded with an electrolyte membrane, and stacks the positive plates into the double-sided plates and keeps the double-sided plates for testing, is characterized by comprising the following steps:
step one, obtaining a double-sided negative plate and two positive plates which are compounded with an electrolyte membrane;
step two, the double-sided negative plate is accommodated in a lower accommodating cavity (501) corresponding to the shape of the double-sided negative plate;
step three, one of the two positive electrode plates is accommodated in a first positive electrode accommodating cavity (502) which is communicated with the lower accommodating cavity (501) and has a shape corresponding to the shape of the positive electrode plate, so that the positive electrode plate is in contact with the lower surface of the electrolyte membrane;
step four, accommodating another positive electrode plate in a second positive electrode accommodating cavity (401) corresponding to the shape of the positive electrode plate, and enabling the positive electrode plate to be in contact with the upper surface of the electrolyte membrane;
pressing the double-sided pole pieces in the thickness direction through a pressing device and keeping the double-sided pole pieces so that the upper surface and the lower surface of the double-sided negative pole piece are pressed by the two positive pole pieces with preset pressing force;
and step six, arranging two leading-out ends which are insulated and isolated from each other so as to be electrically contacted with the two positive plates and lead out for testing.
10. The method of assembling a test battery according to claim 9, wherein: the radial cross-sectional area of the first positive electrode accommodating cavity (502) and/or the second positive electrode accommodating cavity (401) is smaller than that of the lower accommodating cavity (501).
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| CN113804926B (en) * | 2021-09-13 | 2024-06-07 | 中汽创智科技有限公司 | Battery clamp device, preparation test method and application |
| CN114114032A (en) * | 2021-11-15 | 2022-03-01 | 中国电子科技集团公司第十八研究所 | Four-wire system test fixture for high-power lithium battery |
| CN116754630B (en) * | 2023-08-17 | 2023-11-10 | 蓝固(常州)新能源有限公司 | Detection device and method for electrolyte membrane for all-solid-state battery |
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