JP2013058348A - Secondary battery evaluation jig and secondary battery evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery evaluation jig and a secondary battery evaluation method in which a secondary battery to be evaluated can be measured with high accuracy in the same state as the secondary battery to be actually used and can also be assembled with a simple structure and excellent sealing performance.SOLUTION: A secondary battery evaluation jig includes: a lower vessel having a housing part which houses an electrode composed of a flat plate-shaped positive electrode and negative electrode having a portion on which an active material is coated and a portion on which the active material is not coated; and an upper vessel which tightly closes the housing part from the outside by being bonded to the lower vessel and in which an electrode terminal part connected to the electrode is formed. The electrode terminal part is formed on the upper vessel so as to abut on the portion on which the active material is not coated.

Description

  The present invention relates to a secondary battery evaluation jig and a secondary battery evaluation method for evaluating a battery element used in a secondary battery.

The secondary battery evaluation jig is generally known as an electrochemical cell having a sealed container, and the three-electrode type has a working electrode, a counter electrode, and a reference electrode for determining potential, which are arranged oppositely, The monopolar potential can be measured.
This type of secondary battery evaluation jig is used to evaluate an actually used secondary battery, and requires high-precision measurement, and appropriately arranges battery elements including electrodes to be evaluated for each evaluation test. In order to perform measurement, it is required to be able to be assembled with a simple structure and good sealing performance.

So far, various secondary battery evaluation jigs have been proposed in which the arrangement structure of battery elements arranged in a container is devised (see Patent Documents 1 to 8).
For example, in Patent Document 1, a working electrode, a counter electrode disposed opposite to the working electrode, a separator interposed between the working electrode and the counter electrode, and a facing direction of the working electrode and the counter electrode The reference electrode is disposed so as to be separated from the projection surface of the working electrode and the separator is not interposed between the working electrode and a first electrode that presses the working electrode against the counter electrode. There has been proposed a secondary battery evaluation jig including a pressing member and a second pressing member that presses the reference electrode against the separator.
Further, in Patent Document 2, there is a concave portion that accommodates a battery element of a flat laminate composed of a positive electrode, a separator, and a negative electrode, and is connected to one electrode of the battery element at the bottom of the concave portion and is electrically connected to the outside. A first container having one conductor and a planar joining surface; and a planar joining formed by temporarily holding the battery element and joining the first container via a rubber-like hermetic sealing portion. A second container having a surface, and a third container having a planar joining surface that is joined to the second container through a rubber-like hermetic sealing portion and seals the battery element, Connected to the other electrode of the battery element, conducted to the outside through the second container or the third container, and insulated from the first conductor provided in the first container. Conductivity having a second conductor and interposed between the battery element and the second conductor Together with a pin and spring element, the secondary battery evaluation jig communicated is proposed by the first container side and a third container side holes for electrolyte injection.

In these conventional proposals, the electrode terminal is configured to press the electrode from above and below using the pressing of the spring, and generally the electrode terminal, the spring and the electrode are based on the electrode active material application portion of the electrode. It is set as the structure arrange | positioned at an up-down perpendicular | vertical 1 axis direction.
For example, in the secondary battery evaluation jig proposed in Patent Document 1, although the arrangement of the reference electrode is a special and complicated structure (see FIG. 3 of Patent Document 1), each plate-like working electrode, Coil springs are used with the counter electrode and separator placed opposite to the working electrode (upper side) through the separator so that the counter electrode is on the lower side in the housing part of the conductive casing connected to the electrode terminal for the counter electrode The electrode pressing member is brought into close contact by pressing from above, and the potential of the electrode coated with the active material can be measured by connecting the working electrode electrode terminal and the working electrode via the electrode pressing member. A terminal, a spring, and an electrode are arranged in a vertical and uniaxial direction with respect to an electrode active material application portion (see FIG. 1 of Patent Document 1).

  Further, for example, the secondary battery evaluation jig proposed in Patent Document 2 includes a battery element (electrode terminal) connected to a negative electrode terminal, each of which has a plate-shaped positive electrode, separator, and negative electrode laminated. The battery is pressed from the upper side of the push pin (electrode terminal) using a spring (spring) in a state where the negative electrode is placed on the lower side of the concave portion of the lower container so as to face the positive electrode (upper side) through a separator. By arranging the elements in close contact with each other and connecting them to the positive electrode terminal via the push pin, it is possible to measure the potential of the electrode coated with the active material. Generally, the electrode terminal, the spring and the electrode are based on the electrode active material coated portion. As shown in FIG. 1, the structure is arranged in the vertical and uniaxial direction.

However, there are the following problems in the secondary battery evaluation jig in which these conventional electrode terminals, springs, and electrodes are arranged in the vertical one-axis direction of the electrode active material application portion.
(1) First, when an electrode having an active material applied on both upper and lower surfaces is subjected to an evaluation test, there is a problem in that the contact resistance between the electrode terminal and the electrode is increased and high-precision measurement cannot be performed. In addition, in order to reduce the contact resistance, the active material may be applied only to the upper and lower surfaces of the electrode, and the electrode terminal may be connected to the surface where the active material is not applied. Therefore, there is a problem that the battery element cannot be evaluated in a state equivalent to that of the actually used electrode.
(2) Regarding the arrangement of the battery elements, in order to ensure the connection between each electrode terminal and the electrode, the arrangement order is limited, such as a positive electrode terminal, a positive electrode, a separator, a reference electrode, a separator, a negative electrode, and a negative electrode terminal. There is a problem. In other words, if an attempt is made to accurately evaluate the positive electrode, the negative electrode side (negative electrode regulation) is reduced in order to reduce the number of negative electrodes, and the negative electrode has a margin for exceeding the positive electrode capacity. However, in the structure of the conventional secondary battery evaluation jig, since the arrangement order of the battery elements is limited, there is a problem that such measurement cannot be performed.

Japanese Patent No. 4541869 Japanese Patent No. 3731142 Utility Model Registration No. 3066900 Japanese Patent No. 4106206 JP 2000-81405 A JP 2002-98670 A Japanese Patent No. 2585159 Japanese Patent No. 4580751

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, the present invention can measure the secondary battery to be evaluated with high accuracy in a state equivalent to the actually used secondary battery, and can be assembled with a simple structure and good sealing performance. It is an object of the present invention to provide a battery evaluation jig and a secondary battery evaluation method using the secondary battery evaluation jig.

Means for solving the problems are as follows. That is,
<1> A lower container having an accommodating portion for accommodating an electrode made of a flat plate-like positive electrode and a negative electrode on which an active material-coated portion and a portion not coated with the active material are formed; And an upper container in which an electrode terminal part connected to the electrode is formed, and the electrode terminal part is a part where the active material is not applied to the upper container A secondary battery evaluation jig, wherein the jig is formed so as to abut against the secondary battery.
<2> In the above <1>, the upper container includes a container main body and electrode terminals that are held by the container main body to form electrode terminal portions, and the container main body and the electrode terminals are completely insulated. The secondary battery evaluation jig described.
<3> The secondary battery evaluation jig according to any one of <1> to <2>, wherein the electrode terminal portion is formed so as to be in surface contact with a portion where the active material is not applied.
<4> The secondary battery evaluation jig according to any one of <1> to <3>, wherein the jig includes a plurality of positive electrodes and negative electrodes.
<5> A plate-like electrode pressing member that is formed with a contact portion that contacts at least a portion of the electrode coated with the active material on the upper container and is urged toward the upper container by the housing portion of the lower container When the electrode is arranged so that at least a portion of the electrode coated with the active material is placed on the electrode pressing member, the electrode is sandwiched between the contact portion and the electrode pressing member. The secondary battery evaluation jig according to any one of <1> to <4>.
<6> Further, in the housing part of the lower container, an elastic pressing member is embedded at a position facing the electrode terminal part of the upper container, and a portion where at least an active material of the electrode is applied is placed on the electrode pressing member. The secondary battery evaluation jig according to <5>, wherein when the electrode is arranged in such a manner, a portion of the electrode to which the active material is not applied is sandwiched between the electrode terminal portion and the elastic pressing member.
<7> A flat reference electrode is overlaid on the electrode, and when the housing portion is overlaid, at least a part of the portion where the active material of the positive electrode and the negative electrode is not applied is outward from the overlapped portion. The positive electrode and the negative electrode can be accommodated in an exposed state, and the reference electrode can be accommodated in a state in which at least a part of the reference electrode is exposed outward from the overlapped portion. The electrode terminal portions are formed at three positions with respect to the upper container, and each of the electrode terminal portions is in contact with one of the portions exposed to the outside of the positive electrode, the negative electrode, and the reference electrode independently of each other. The secondary battery evaluation jig according to any one of <1> to <6>, wherein the jig is formed on the battery.
<8> The secondary battery evaluation jig according to <7>, wherein the electrode terminal portion is formed so as to be in surface contact with a portion exposed to the outside of the reference electrode.
<9> The upper container is formed with a contact portion that contacts the portion of the reference electrode overlapped with the electrode of the reference electrode, and a flat electrode pressing member that is biased toward the upper container by the housing portion of the lower container. When the reference electrode is arranged so that the portion of the reference electrode overlapped with the electrode is placed on the electrode pressing member, the portion of the reference electrode overlapped with the electrode is the contact portion And the electrode pressing member. The secondary battery evaluation jig according to any one of <7> to <8>.
<10> Furthermore, the elastic pressing member is embedded in the housing portion of the lower container so as to face the electrode terminal portion of the upper container, and the portion superimposed on the electrode of the reference electrode is placed on the electrode pressing member. The portion described in <9>, wherein when the reference electrode is disposed on the electrode, the portion of the reference electrode that is exposed outwardly from the portion that overlaps the electrode is sandwiched between the electrode terminal portion and the elastic pressing member. Secondary battery evaluation jig.
<11> The secondary battery evaluation jig according to any one of <7> to <10>, wherein the positive electrode, the negative electrode, and the reference electrode have substantially the same shape and size.
<12> The secondary battery evaluation jig according to any one of <1> to <11>, wherein each electrode terminal portion has substantially the same shape and size.
<13> The secondary battery evaluation jig according to any one of <6> to <12>, wherein the elastic pressing member is formed of rubber having holes.
<14> Any one of <7> to <13>, wherein at least a portion of the electrode terminal portion that contacts the positive electrode, the negative electrode, and the reference electrode is covered with a metal that is nobler than a metal forming the electrode terminal portion and the electrode. The secondary battery evaluation jig described in 1.
<15> A secondary battery evaluation method for evaluating the performance of a secondary battery using the secondary battery evaluation jig according to any one of <1> to <14>, wherein a portion coated with an active material; In a state where an electrode composed of a plate-like positive electrode and a negative electrode on which a portion not coated with the active material is formed is arranged in a housing portion of the secondary battery evaluation jig, the electrode terminal portion is connected to an external measuring device, and A method for evaluating a secondary battery, comprising measuring characteristics of a battery element of a secondary battery including an electrode.
<16> A flat reference electrode is stacked between the electrodes, and the electrode is arranged in a state where at least a part of the electrode not coated with the active material is exposed outwardly from the overlapped part with respect to the housing part. In addition, the secondary battery evaluation method according to <15>, wherein the reference electrode is disposed in a state where at least a part of the reference electrode is exposed outward from the overlapped portion.

  According to the present invention, it is possible to solve the above-mentioned problems in the prior art, and to measure a secondary battery to be evaluated with high accuracy in a state equivalent to a secondary battery actually used. In addition, it is possible to provide a secondary battery evaluation jig that can be assembled with a simple structure and good airtightness, and a secondary battery evaluation method using the secondary battery evaluation jig.

1 is a perspective view of a secondary battery evaluation jig 1 according to an embodiment of the present invention. FIG. 4 is a perspective view of the lower container 10. It is a perspective view of the lower container 10 in the state where the battery element is arranged. It is a perspective view of an electrode (negative electrode 2, positive electrode 3). It is a perspective view of the secondary battery evaluation jig 100 concerning other embodiments of the present invention. 2 is a partial perspective view of a secondary battery evaluation jig 100. FIG. It is a fragmentary perspective view which shows the example of a change of the secondary battery evaluation jig | tool 100. FIG.

A secondary battery evaluation jig according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a secondary battery evaluation jig 1 according to an embodiment of the present invention.
As shown in FIG. 1, the secondary battery evaluation jig 1 includes a lower container 10 and an upper container 20 that is bonded to the lower container 10. Each of these members is fixed by pressing the upper container 20 toward the lower container 10 by tightening the wing nut 32 after the bolt 31 is inserted into the insertion portion of the bolt 31 formed on each member.
The electrode terminal 21 has a rod shape and is inserted into and fixed to the upper container 20, and is configured such that one end of the electrode terminal 21 is exposed upward from the upper container 20 and the other end is exposed downward. Two nuts 27 holding and holding a terminal of an external measuring device (not shown) for measuring the electrode potential are screwed into a portion exposed above the electrode terminal 21, and the terminal of the external measuring device and the electrode terminal 21 are screwed together. Connection with is possible.

FIG. 2A shows a perspective view of the lower container 10.
The lower container 10 has a box shape in which the outer frame 16 protrudes upward from the outer periphery of the floor surface 17. The floor surface 17 is provided with a storage portion 11 that stores battery elements such as electrodes, and the outer periphery of the storage portion 11 is provided with an O-ring 14 embedded in a guide groove formed in the floor surface 17. . The upper side of the O-ring 14 is exposed from the floor surface 17 toward the upper container 20, and comes into contact with the upper container 20 when the lower container 10 and the upper container 20 are joined together. Maintains airtightness inside. In addition, insertion grooves 15 into which the bolts 31 are inserted are formed at each corner of the floor surface 17.
The lower container 10 is formed of a resin having resistance to the electrolyte.

FIG. 2B is a perspective view showing a state in which battery elements such as electrodes are accommodated in the accommodating portion 11 of the lower container 10.
The accommodating part 11 accommodates a flat electrode. Here, a battery element in which a negative electrode 2, a positive electrode 3, and a reference electrode 4 are stacked as an electrode through separators 5 and 5 ′ is accommodated.
The negative electrode 2, the positive electrode 3, and the reference electrode 4 have substantially the same shape and size. As shown in FIG. 3, the negative electrode 2 and the positive electrode 4 have an active material coated on a part of both surfaces thereof, and a portion 6 where the active material is applied and a portion 7 where the active material is not applied are formed.
The negative electrode 2 and the positive electrode 3 are arranged such that at the time of overlapping, at least a part of the portion 7 to which each active material is not applied is exposed outward from the overlapped portion. The reference electrode 4 is arranged such that when the reference electrode 4 is overlapped with the negative electrode 2 and the positive electrode 3, a part of the reference electrode 4 is exposed outward from the overlapped portion. In particular, the negative electrode 2, the positive electrode 3, and the reference electrode 4 are preferably arranged so as to overlap each other so that the exposed portions of the electrodes are arranged at a sufficiently large distance (see FIG. 2B).
In addition, as the battery element, the entire battery element may be immersed in an electrolyte to exert a battery function. In addition, in order to facilitate assembly, a separator having an electrolyte adsorbed thereon is used as the separator 5, 5 ′. The battery function may be exhibited.

In addition, a flat plate-like electrode pressing member 12 that is biased toward the upper container 20 is disposed in the accommodating portion 11, and an elastic pressing member 13 is embedded (see FIG. 2A).
Here, the electrode pressing member 12 and the elastic pressing member 13 are provided with a portion 6 on which at least the active material of the negative electrode 2 and the positive electrode 3 is applied on the electrode pressing member 12, and the negative electrode 2 and the positive electrode on the elastic pressing member 13. 3, at least a portion 7 where no active material is applied is arranged. In addition, a part of the reference electrode 4 is disposed on the electrode pressing member 12, and the other part is disposed on the elastic pressing member 13 (see FIG. 2B).

  The elastic pressing member 13 is composed of an elastic body such as a spring or rubber. When the elastic pressing member 13 is formed of rubber, it is preferable that holes are formed in the member. By forming such a hole, when a contact pressure from the electrode is applied by tightening from the upper container 20, an escape path that can be elastically deformed at a position lower than the natural height position is created. Can do. Accordingly, the electrode is sandwiched between the elastic pressing member 13 and the electrode terminal 21 without hindering the sealing in the housing portion 11 by the O-ring 14 during assembly.

The upper container 20 is bonded to the lower container 10 to seal the housing portion 11 of the lower container 10 from the outside. The container body 25 is made of an insulating resin, and the negative electrode 2, It has three electrode terminals 21 connected to the positive electrode 3 and the reference electrode 4 (see FIG. 1).
The joining of the lower container 10 and the upper container 20 is performed by fitting the flange portion formed on the outer periphery of the container body 25 and the outer frame 16 of the lower container 10 at the time of assembly.
A bolt hole (not shown) through which the bolt 31 is inserted is formed at each corner of the upper container 20.

Further, a groove (not shown) whose outer periphery corresponds to the outer edge shape of the negative electrode 2, the positive electrode 3, and the reference electrode 4 is formed on the surface to be joined with the lower container 10 of the container body 25, Each electrode is housed in.
In this groove, a convex contact portion (not shown) that contacts at least a portion 6 of the negative electrode 2 and the positive electrode 3 coated with an active material and a portion of the reference electrode 4 (portion where the electrodes are overlapped) is formed. Has been. This abutting portion is formed by pressing the electrode when the electrodes 6 are arranged so that at least a portion 6 of the negative electrode 2 and the positive electrode 3 coated with the active material and a part of the reference electrode 4 are placed on the electrode pressing member 12. The electrodes 2, 3, and 4 are sandwiched together with the member 12 so that the battery elements can be closely arranged so that no gap is generated in the stacking direction of the battery elements.

The three electrode terminals 21 are held by the container body 25 at a position where they are in contact with one of the portions exposed to the outside of the negative electrode 2, the positive electrode 3, and the reference electrode 4 independently of each other. Here, the electrode terminal 21 is made of a substantially rod-like member, and an O-ring (not shown) is wound around the notched portion of the trunk, and the O-ring is inserted so as to crush the container body 25. Retained.
In this way, the electrode terminal 21 held in the container body 25 of the upper container 20 is connected to the elastic pressing member 13 of the lower container 10 at the time of assembly, and the portion 7 where the active material of the negative electrode 2 and the positive electrode 3 is not applied and the outside of the reference electrode 4. It is supposed that the exposed part is sandwiched.

  The electrode terminal 21 can be brought into surface contact with these electrodes by making the portions in contact with the negative electrode 2, the positive electrode 3, and the reference electrode 4 at one end thereof smooth and further reduce the contact resistance with these electrodes. For this reason, the portions in contact with these electrodes are covered with a metal that is nobler than the metal forming the electrode terminal 21 and the electrodes (2, 3, 4) such as gold plating. The other end protrudes from the upper surface of the container body 25 and can be connected to a terminal of an external measuring device.

A method for assembling the secondary battery evaluation jig 1 will be described.
First, a battery element is arrange | positioned in the accommodating part 11 of the lower container 10 (refer FIG. 2B). Here, the arrangement order of the battery elements is arranged in the order of the negative electrode 2, the separator 5, the positive electrode 3, the separator 5 ′, and the reference electrode 4, but the order of arrangement of the electrodes 2, 3, 4 is limited. Alternatively, the battery elements may be arranged in an arrangement order other than this. That is, the portion 7 of the negative electrode 2 and the positive electrode 3 to which the active material is not applied and the part of the reference electrode 4 are arranged so as to be exposed to the outside from the portion where these electrodes are overlapped, so that 3 Connection with two electrode terminals is possible.

In the example shown in FIG. 2B, the negative electrode 2 arranged at the lowermost side is arranged so that the portion 6 to which the active material is applied is placed on the electrode pressing member 12 of the lower container 10. Next, the separator 5 is disposed so as to cover the portion 6 coated with the active material of the negative electrode 2 from above. Next, the positive electrode 3 is arranged so that the portion 6 coated with the active material is placed on the separator 5. Next, a separator 5 ′ is disposed so as to cover the portion 6 coated with the active material of the positive electrode 3 from above. Next, the reference electrode 4 is arranged so that a part is placed on the separator 5 ′. The negative electrode 2, the positive electrode 3, and the portion 6 coated with the active material are arranged so as to be exposed to the outside, and the reference electrode 4 is exposed to the outside from the portion overlapped with the electrodes 2 and 3. Arranged.
In addition, the number of arrangement | positioning of each electrode does not have a restriction | limiting in particular, When evaluating the positive electrode 3, when arrange | positioning the negative electrode 2 in two sheets, for example, aligning a shape, and evaluating the negative electrode 2, For example, the positive electrodes 3 can be arranged in a stack of two sheets with the same shape.
Further, by disposing a plurality of electrodes (negative electrode 2 and positive electrode 3), it is possible to evaluate the same capacity as the actual battery.
In addition, although the form which arrange | positions the reference electrode 4 was demonstrated in this example, it can also be set as the form which distributes only the negative electrode 2 and the positive electrode 3. FIG.

Next, the outer container 16 and the flange part (not shown) of the upper container 20 are aligned with the lower container 10 in which the respective battery elements are arranged in the accommodating part 11, and the upper container 20 is attached.
At this time, the portion of the uppermost reference electrode 4 that is overlapped with the electrodes 2 and 3 is disposed opposite to the contact portion of the upper container 20, and the portion that is exposed outward from the overlapped portion is: The upper container 20 is disposed to face the smooth surface of the electrode terminal. In addition, the negative electrode 2 and the portion 6 to which the active material of the positive electrode 3 is applied below the reference electrode 4 are also arranged so as to face the contact portion of the upper container 20 through the reference electrode 4. Thus, each battery element is accommodated in the groove of the upper container 20.

Next, the wing nut 32 is screwed and the upper container 20 is pressed toward the lower container 10. This pressing is performed until the lower container 10 and the upper container 20 are in close contact with each other. As a result, a gap is created between the part 6 where the active material of the negative electrode 2 and the positive electrode 3 disposed in the accommodating portion 11 of the lower container 10 and the reference electrode 4 are overlapped with each of the battery elements. And sandwiched between the electrode pressing member 12 of the lower container 10 and the abutting portion of the upper container 20 and outward from the portion 7 where the active material of the negative electrode 2 and the positive electrode 3 is not applied and the portion where the reference electrode 4 is overlapped. The exposed portion is sandwiched between the elastic pressing member 13 of the lower container 10 and the electrode terminal 21 of the upper container 20. In addition, the O-ring 14 of the lower container 10 and the upper container 20 securely seal the accommodating portion 11 of the lower container 10.
Thus, the secondary battery evaluation jig 1 is assembled.

By connecting a terminal of an external measuring device (not shown) between the two nuts 27 screwed to the electrode terminal 21 of the secondary battery evaluation jig 1 assembled in this way, a battery comprising the battery element is connected. Measure and evaluate battery characteristics.
In addition, the secondary battery evaluation jig 1 can charge a secondary battery composed of the battery elements by connecting a terminal of an external power source (not shown) to the electrode terminal 21 in the same manner as the terminal connection of the external measuring device. Is possible.

According to the secondary battery evaluation jig 1 described above, even with an electrode coated with an active material on both sides, a portion 6 where the active material is applied to the electrodes (negative electrode 2, positive electrode 3) and a portion 7 where the active material is not applied are formed. By connecting a portion 7 not applied with the active material, which is arranged at a position deviated from the vertical (vertical) direction of the portion 6 coated with the active material, to the electrode terminal 21 with respect to the applied electrode, the battery element can be made with high accuracy. Can be evaluated.
Further, since the conventional electrode terminals, springs, and electrodes have a device configuration different from the arrangement configuration in the vertical uniaxial direction based on the electrode active material application portion, there is no restriction in the arrangement order of the battery elements, for example, the positive electrode 3 It is easy to adjust the capacity balance between the negative electrode 2 and the positive electrode 3 and evaluate the characteristics of the battery element with high accuracy, such as two negative electrodes 2 in the evaluation and two positive electrodes 3 in the negative electrode 2 evaluation. it can. At the same time, since there is no restriction on the number of the negative electrodes 2 and the positive electrodes 3, an evaluation test simulating a battery form actually used is possible.
Moreover, since it is a simple structure, it can be assembled with good airtightness manually without using a special device, and the assembling work can be easily performed in the glove box.

Further, if the size and shape of each electrode terminal 21 are the same, the voltage drop due to the resistance of each electrode terminal 21 becomes the same, and high accuracy evaluation is possible.
Further, if the contact between each electrode terminal 21 and each electrode 2, 3, 4 is not a point contact but a wide surface contact, the contact resistance can be reduced, and a highly accurate evaluation can be performed.
Moreover, if the contact portion is covered with a metal that is nobler than the metal forming the electrode terminal 21 and the electrodes (2, 3, 4) such as gold plating, no oxide is generated on the terminal surface, and the conductivity is maintained. can do.

The container 11 of the lower container 10 has at least a part of the negative electrode 2 and the positive electrode 3 where the active material is not applied and one reference electrode 4 when the three types of electrodes including the reference electrode 4 are stacked. The electrode can be accommodated in a state where the electrode is exposed to the outside from the portion where the electrodes are overlapped, and the electrode terminal 21 is formed at three positions corresponding to the electrodes with respect to the upper container 20. Since each electrode terminal portion is formed so as to be in contact with one portion of the portions 7 to which the active material exposed to the outside is not applied, a special reference electrode as in the prior art is formed. Thus, it is possible to prevent erroneous measurement caused by the unstable setting position of the reference electrode.
Moreover, since the container main body 25 of the lower container 10 and the upper container 20 is formed as a resin insulator and is configured independently of the electrode terminal 21 as a conductor, the electrolyte contacts these containers. Thus, the potential of the container or the like is not picked up, and highly accurate evaluation with few errors is possible.
Moreover, the arrangement | positioning arrangement | positioning of each battery element and the reliable connection with the electrode terminal 21 can be implement | achieved only by arrange | positioning the electrode press member 12 and the elastic press member 13 in the lower container 10, and the lower container 10 A reliable sealing of the accommodating portion 11 can be realized only by arranging the O-ring 14.

A secondary battery evaluation jig 100 according to another embodiment of the present invention will be described with reference to FIGS. 4 and 5.
Unlike the secondary battery evaluation jig 1 described above, the secondary battery evaluation jig 100 has a configuration in which a rod-like reference electrode 40 is provided instead of the flat reference electrode 4 (see FIG. 4).
The reference electrode 40 is held in a reference electrode holding member 41 so as to be screwable. The reference electrode holding member 41 is attached to the hole formed in the upper container 120 so as to be detachable with a screw type or the like.
Therefore, by attaching the reference electrode holding member holding the reference electrode 40 to the hole of the upper container 120 and screwing the reference electrode 40 in the direction of the lower container 10, the upper and lower ends of the reference electrode 40 are The state protrudes from the upper container 120.

The end projecting toward the lower container 10 side of the reference electrode 40 is arranged in the accommodating part 11 in which the upper container 120 and the O-ring 14 maintain airtightness, and the electrolytic solution poured into the accommodating part 11 is poured. The liquid can be contacted (see FIG. 5).
Further, the end portion of the reference electrode 40 protruding on the upper container 10 is connected to a terminal of an external measuring device (not shown) so that the electrode potential of the reference electrode 40 can be measured.
Since the other parts are substantially the same as the configuration of the secondary battery evaluation jig 1, the description thereof is omitted.

Furthermore, a modified example of the secondary battery evaluation jig 100 will be described with reference to FIG.
In this modified example, a separator 50 is used instead of the separator 5. The separator 50 is larger than the separator 5 and contains an electrolytic solution.
The reference electrode 40 and the separator 50 are included by bringing the portion exposed to the outside with the positive electrode 3 overlaid on the separator 50 into contact with the end protruding to the lower container 10 side of the reference electrode 40. The electrolyte solution can be contacted.
Since the other parts are substantially the same as the configuration of the secondary battery evaluation jig 100, the description thereof is omitted.

  Note that each of the secondary battery evaluation jigs 1 and 100 and the modification examples thereof illustrate one embodiment of the present invention, and the technical idea of the present invention is limited to the features of these embodiments. It is not a thing.

  As described above, the present invention provides exceptional convenience and can be widely used in various fields dealing with secondary batteries.

DESCRIPTION OF SYMBOLS 1,100 Secondary battery evaluation jig | tool 2 Negative electrode 3 Positive electrode 4,40 Reference electrode 5, 5 ', 50 Separator 6 The part which apply | coated the active material 7 The part which does not apply | coat an active material 10 Lower container 11 Storage part 12 Electrode pressing member DESCRIPTION OF SYMBOLS 13 Elastic pressing member 14 O-ring 15 Insertion groove 16 Outer frame 17 Floor surface 20,120 Upper container 21 Electrode terminal 25 Container main body 27 Nut 31 Bolt 32 Wing nut 41 Reference electrode holding member

Claims (16)

A lower container having an accommodating portion for accommodating an electrode composed of a plate-like positive electrode and a negative electrode on which an active material-coated portion and a portion not coated with the active material are formed;
An upper container in which an electrode terminal portion connected to the electrode is formed, and is sealed with the accommodating portion from the outside by being attached to the lower container,
The secondary battery evaluation jig, wherein the electrode terminal portion is formed in contact with a portion where the active material is not applied to the upper container.   The secondary container according to claim 1, wherein the upper container has a container main body and an electrode terminal that is held by the container main body to form an electrode terminal portion, and the container main body and the electrode terminal are completely insulated. Battery evaluation jig.   The secondary battery evaluation jig according to claim 1, wherein the electrode terminal portion is formed so as to be in surface contact with a portion where the active material is not applied.   The secondary battery evaluation jig according to claim 1, comprising a plurality of positive electrodes and negative electrodes. An abutting portion that abuts at least a portion of the electrode on which the active material is applied is formed on the upper container, and a flat electrode pressing member that is biased toward the upper container is disposed in the housing portion of the lower container. ,
The electrode is sandwiched between the contact portion and the electrode pressing member when the electrode is disposed so that at least a portion of the electrode coated with an active material is placed on the electrode pressing member. The secondary battery evaluation jig according to any one of 1 to 4.   Furthermore, in the housing part of the lower container, an elastic pressing member is embedded at a position facing the electrode terminal part of the upper container, and the electrode is placed such that at least a portion of the electrode coated with an active material is placed on the electrode pressing member. The secondary battery evaluation jig according to claim 5, wherein a portion where the active material of the electrode is not applied is sandwiched between the electrode terminal portion and the elastic pressing member. A flat reference electrode is superimposed on the electrode,
The accommodating portion is capable of accommodating the positive electrode and the negative electrode in a state in which at least a part of the portion where the active material of the positive electrode and the negative electrode is not applied is exposed to the outside from the overlapped portion when they are stacked. And the reference electrode can be accommodated in a state in which at least a part of the reference electrode is exposed outward from the overlapped portion,
The electrode terminal portions are formed at three positions with respect to the upper container, and each of the electrode terminal portions is one portion of the portions exposed to the outside of the positive electrode, the negative electrode, and the reference electrode independently of each other. The secondary battery evaluation jig according to claim 1, wherein the secondary battery evaluation jig is formed so as to abut against the secondary battery.   The secondary battery evaluation jig according to claim 7, wherein the electrode terminal portion is formed so as to be in surface contact with a portion exposed to the outside of the reference electrode. A contact portion that is in contact with the portion of the reference electrode that is superimposed on the electrode of the reference electrode is formed in the upper container, and a flat plate-like electrode pressing member that is biased toward the upper container is disposed in the storage portion of the lower container,
When the reference electrode is arranged so that a portion of the reference electrode overlapped with the electrode is placed on the electrode pressing member, the portion of the reference electrode overlapped with the electrode is the contact portion and the electrode The secondary battery evaluation jig according to claim 7, wherein the secondary battery evaluation jig is sandwiched between the pressing members.   Further, in the housing part of the lower container, an elastic pressing member is embedded at a position facing the electrode terminal part of the upper container, and the above-mentioned reference is placed so that the portion overlapping the electrode of the reference electrode is placed on the electrode pressing member. The secondary battery evaluation unit according to claim 9, wherein when a pole is disposed, a portion of the reference electrode that is exposed outward from a portion that overlaps the electrode is sandwiched between the electrode terminal portion and the elastic pressing member. Ingredients.   The secondary battery evaluation jig according to claim 7, wherein the positive electrode, the negative electrode, and the reference electrode have substantially the same shape and size.   The secondary battery evaluation jig according to claim 1, wherein each electrode terminal portion has substantially the same shape and size.   The secondary battery evaluation jig according to claim 6, wherein the elastic pressing member is formed of rubber having holes.   The secondary battery according to any one of claims 7 to 13, wherein at least a portion of the electrode terminal portion that comes into contact with the positive electrode, the negative electrode, and the reference electrode is covered with a metal that is nobler than a metal forming the electrode terminal portion and the electrode. Evaluation jig. A secondary battery evaluation method for evaluating the performance of a secondary battery using the secondary battery evaluation jig according to claim 1,
In a state where an electrode composed of a plate-like positive electrode and a negative electrode on which an active material is applied and a portion on which the active material is not applied is formed is disposed in a housing portion of the secondary battery evaluation jig, the electrode terminal portion is externally connected. A secondary battery evaluation method, comprising: connecting to a measuring device and measuring characteristics of a battery element of a secondary battery including the electrode.   A plate-shaped reference electrode is stacked between the electrodes, and the electrode is disposed in a state where at least a part of the portion where the active material of the electrode is not applied is exposed to the outside from the overlapped portion with respect to the housing portion, The secondary battery evaluation method according to claim 15, wherein the reference electrode is disposed in a state where at least a part of the reference electrode is exposed outward from the overlapped portion.