JP5636634B2 - Electrode plate pressurizing device - Google Patents

Description

  The present invention relates to a technique of an electrode plate pressurizing device for pressing an electrode plate having a laminated structure in a laminating direction.

  Conventionally, for example, in a lithium ion secondary battery, in order to suppress variations in current density that cause deterioration and performance degradation, an electrode plate having a laminated structure, which is a component of the battery, is uniformly pressed in the stacking direction. Is known to be effective. Here, it is known that the pressure applied to the electrode plate has an appropriate value according to the specification of the electrode plate. That is, the pressure applied to the electrode plate has the property that it may not be too strong or too weak, and it is necessary to keep the pressure evenly and constantly.

  However, when the electrode plate is energized, the electrode plate expands or the device that restrains the electrode plate expands or deforms due to heat generated from the electrode plate. There was a problem that it was difficult to keep the pressure uniform and constant.

As a technique capable of solving such a problem, there is a technique disclosed in Patent Document 1 shown below, which is publicly known.
In the related art disclosed in Patent Document 1, the bipolar battery is housed in a case filled with fluid, the fluid in the case is pressurized by a pressurizing unit connected to the inside of the case, and the end surface of the bipolar battery is fluidized by the fluid. The electrode plate of the bipolar battery is pressed evenly and uniformly in the stacking direction. In this conventional technology, the temperature of the case is detected, and the pressurizing unit is feedback-controlled by the control device based on the temperature, and the pressurizing force by the fluid is controlled, so that an appropriate pressurizing state according to the situation change. It is set as the structure which maintains.

  However, in the conventional configuration disclosed in Patent Document 1, an electrode plate pressurization device (that is, a pressurization unit and a control device) must be provided for each battery, and the electrode plate pressurization device is increased in size and complexity. In addition, there is a problem that the manufacturing cost of the battery is increased. In addition, there is a problem that the reliability of the battery may be lowered because there is a possibility of failure in the configuration of the electrode plate pressurizing device.

JP 2008-147010 A

  The present invention has been made in view of the present situation, and in order to further promote the spread of lithium ion secondary batteries and the like, the pressure applied to the electrode plate having a laminated structure can be kept uniform and constant with a simple configuration. It is an object of the present invention to provide a highly reliable electrode plate pressurizing apparatus capable of achieving the above.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, an electrode plate pressing device for pressing an electrode plate formed by laminating an electrode plate and a separator in a laminating direction, the pair of first electrodes facing in parallel At least one of the first and second restraint plates, and a second restraint plate, and a holding device capable of adjusting and holding a distance between the first and second restraint plates. Between the first and second constraining plates, and an electrode plate placement portion that is a portion where the electrode plates are placed, and is a first liquid enclosure that is a space capable of holding a liquid A pressurizing apparatus comprising: a first and second elastically deformable film bodies that constitute at least a portion facing the electrode plate arrangement portion of the partition walls forming the first liquid sealing portion; A second space that can hold the liquid communicating with the liquid enclosure. A liquid enclosure and a space built in the second liquid enclosure and in contact with the liquid held in the second liquid enclosure are spaces formed by elastically deformable film bodies that hold gas And a pressure accumulating device having a gas sealing portion.

  According to a second aspect of the present invention, the first liquid enclosing portion is a recess that is formed in at least one of the first and second restraining plates and is opened toward the electrode plate placement portion. The elastically deformable film body constituting the partition wall forming the liquid sealing portion covers the open portion of the recess.

  According to a third aspect of the present invention, the second liquid enclosure is a separate container from the first liquid enclosure.

According to a fourth aspect of the present invention, there is provided an electrode plate pressurizing device for pressurizing an electrode plate formed by laminating an electrode plate and a separator in a laminating direction, and a pair of first and first opposing electrodes A restraint device having a second restraint plate, and a holding device capable of adjusting and holding a distance between the first and second restraint plates, and at least one of the first and second restraint plates And an electrode plate placement portion which is formed between the first and second restraint plates and is a portion where the electrode plate is placed, and a liquid enclosing portion which is a space capable of holding a liquid, and the liquid A pressurizing device having an elastically deformable film body that constitutes at least a portion of the partition wall forming the enclosing portion that faces the electrode plate arrangement portion, and faces the electrode plate arrangement portion of the liquid enclosure portion On the opposite side of the liquid sealing part Has been in contact with the liquid, a portion in contact with the liquid are those comprising a pressure accumulating device having a gas-filled portion which can hold a space formed of an elastically deformable membrane body gases, the.

In Claim 5, the said gas enclosure part is a recessed part formed in at least any one of said 1st and 2nd restraint plate, and is open | released toward the said electrode plate arrangement | positioning part, and comprises the said gas enclosure part the film body that is intended to fully cover the opening portion of the recess.

  As effects of the present invention, the following effects can be obtained.

  Claims 1 and 4 are elements that can absorb the change in volume of the liquid and the restraining device due to the expansion and heat generation of the electrode plate by the change in volume of the gas sealing portion, and act passively on the factor that the applied pressure fluctuates. Can only be adjusted. This also makes it possible to configure a highly reliable electrode plate pressing device with a simple configuration.

  In Claims 2 and 5, the electrode plate pressurizing device can be made compact.

  According to the third aspect of the present invention, the required volume of the liquid enclosure can be easily ensured. As a result, the pressure applied to the electrode plate can be reliably and uniformly maintained.

The schematic diagram which shows the whole structure of the electrode plate pressurization apparatus which concerns on the 1st Example of this invention. The schematic diagram which shows the use condition of the electrode plate pressurization apparatus which concerns on the 1st Example of this invention. The schematic diagram which shows the whole structure of the electrode plate pressurization apparatus which concerns on the 2nd Example of this invention. The schematic diagram which shows the whole structure of the electrode plate pressurization apparatus which concerns on the 3rd Example of this invention. The schematic diagram which shows the application example (when applied to an electrode plate evaluation apparatus) of the electrode plate pressurization apparatus which concerns on 1st Example of this invention. The schematic diagram which shows the application example (when applied to a battery) of the electrode plate pressurization apparatus which concerns on the 1st Example of this invention.

Next, embodiments of the invention will be described.
First, the overall configuration of the electrode plate pressurizing apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing the overall configuration of an electrode plate pressurizing apparatus according to a first embodiment of the present invention.
As shown in FIG. 1, the electrode plate pressurizing device 1 according to the first embodiment of the present invention is configured by a restraint device 2, a pressurizing unit 3, a pressure accumulating unit 13, and the like.

First, the restraint device 2 will be described.
The restraint device 2 includes a first restraint plate 4, a second restraint plate 5, support members 6, 6... And the like, and a portion of a gap formed by the first restraint plate 4 and the second restraint plate 5 is an electrode plate. 7 is an electrode plate placement portion 8 on which 7 is placed. Here, the electrode plate 7 applied to the electrode plate pressurizing apparatus 1 includes a positive plate 7a, a negative plate 7b, a separator 7c, and the like. Note that the electrode plate 7 shown in the present embodiment has a configuration in which one positive plate 7a, one negative plate 7b, and one separator 7c are provided for the sake of simplicity, but a large number of members are laminated. Even an electrode plate having the structure described above can be applied to the electrode plate pressurizing apparatus according to the present invention (the same applies to the second and third embodiments described below). Moreover, the electrode plate 7 is not limited to the one used for the battery, and for example, an electrode plate provided inside the capacitor can also be applied to the present invention.

  The first constraining plate 4 and the second constraining plate 5 are substantially rectangular steel members in plan view, and the surfaces facing each other are used as the pressure surfaces 4a and 5a so that the pressure surfaces 4a and 5a are parallel to each other. It is supported by the support members 6.

  The second constraining plate 5 forms a base portion of the electrode plate placement portion 8 on which the electrode plate 7 is disposed, and the insulating sheet 12 is disposed on the pressing surface 5a. The insulating sheet 12 serves to ensure insulation by preventing the electrode plate 7 from directly contacting the second constraining plate 5 that is a metal member. For example, the electrode plate 7 itself is insulated. This is not necessary when the material is laminated with a conductive material, and can be appropriately omitted depending on the specifications of the electrode plate 7 and the restraint plates 4 and 5.

  The support members 6, 6... Are members that protrude perpendicularly to the pressurizing surface 5 a at the four corners of the second restraint plate 5, and employ substantially round bar-shaped members in which female screws are engraved. ing. .. Are screwed into the support members 6.

  Further, holes 4b, 4b,... Are formed in the four corners corresponding to the arrangement of the support members 6, 6,. Yes. Then, the support members 6, 6... Are inserted into the holes 4 b, 4 b, and the pressurizing surface 4 a of the first constraining plate 4 and the pressurizing surface 5 a of the second constraining plate 5 face each other. The restraint plates 4 and 5 are assembled.

  At this time, the nuts 9, 9... Screwed into the support members 6. By adjusting the screwing position (height), the separation distance between the first restraining plate 4 and the second restraining plate 5 can be adjusted, and the nuts 9 and 9 on both the upper and lower sides can be adjusted in the state where the adjustment of the spacing distance is completed. Is configured so that the first restraining plate 4 can be held at a desired position.

  That is, in the electrode plate pressurizing device 1 according to the first embodiment of the present invention, the first restraint plate 4 and the second restraint plate 5 are separated by the support members 6. A holding unit 20 as a holding device for adjusting and holding the distance is configured.

  And the electrode plate 7 is arrange | positioned in the clearance gap (namely, electrode plate arrangement | positioning part 8) formed between each pressurization surface 4a * 5a in the state which hold | maintained the 1st restraint plate 4 in the desired position. Note that the configuration of the support member applied to the electrode plate pressurizing apparatus according to the present invention is not limited to the configuration of the present embodiment, and it is possible to adjust and hold the separation positions of the first constraint plate and the second constraint plate. Various other configurations can be adopted as long as the configuration is adopted.

Next, the pressurizing unit 3 will be described.
The first constraining plate 4 is formed with a liquid enclosing portion 10 for enclosing a liquid, which is a recess opened to the pressing surface 4a. And the elastic sheet 11 is arrange | positioned so that the open part of this liquid enclosure part 10 may be covered entirely. By setting it as such a structure, according to the pressure of the liquid enclosed with the liquid enclosure part 10, the elastic sheet 11 is expanded-contracted, and the bulge amount of the elastic sheet 11 with respect to the pressurization surface 4a can be changed. In addition, the kind of liquid enclosed with the liquid enclosure part of the electrode plate pressurization apparatus which concerns on this invention is not specifically limited, Various liquids, such as water and oil, can be applied.

  Then, by adjusting the bulging amount of the elastic sheet 11, it is possible to adjust the pressure applied to the electrode plate 7 arranged in the electrode plate arrangement portion 8. In other words, the expansion and deformation of the electrode plate 7 can be transmitted to the liquid enclosed in the liquid enclosure 10 via the elastic sheet 11. In the present embodiment, the pressurizing unit 3 is formed only on the pressurizing surface 4a on the first constraining plate 4 side. For example, the same as the pressurizing unit 3 on the pressurizing surface 5a on the second constraining plate 5 side. It is also possible to form a pressurizing part, or to form a pressurizing part similar to the pressurizing part 3 on both the pressurizing surfaces 4a and 5a.

  That is, in the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention, the electrode plate 7 is pressed by the liquid enclosure part 10, the elastic sheet 11, and the liquid enclosed in the liquid enclosure part 10. The pressurizing unit 3 as a pressurizing device is configured.

That is, in the electrode plate pressurizing device 1 according to the first embodiment of the present invention, the pressurizing unit 3 as the pressurizing device is formed on at least one of the first constraining plate 4 and the second constraining plate 5, and the electrode The liquid sealing portion 10 is formed as a void portion having an open portion that opens toward the plate placement portion 8, and an elastic sheet 11 that is a film body that airtightly covers the open portion.
With such a configuration, it is not necessary to separately provide a control device or the like, and thus the electrode plate pressurizing device 1 can be made compact.

Next, the pressure accumulating unit 13 will be described.
The pressure accumulating unit 13 includes a liquid enclosure 14 serving as a second liquid enclosure, a gas enclosure 15 that forms an independent space in the liquid enclosure 14, and the like.
The liquid enclosure 14 communicates with the liquid enclosure 10 through the communication hole 4 c formed in the first restraining plate 4 and the piping member 18 in the internal space. That is, the integral liquid sealing part 10 is formed including not only the concave part formed in the first restraining plate 4 but also the internal space of the liquid sealing container 14.

In other words, in the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention, the liquid sealing portion 10 is a first liquid sealing formed on at least one of the first constraining plate 4 and the second constraining plate 5. And a liquid enclosure 14 that is a container separate from the first restraint plate 4 and the second restraint plate 5 and is a second liquid enclosure that communicates with the first liquid enclosure. It is what is done.
With such a configuration, the necessary volume of the liquid enclosure 10 can be easily ensured. Thereby, the applied pressure to the electrode plate 7 can be held uniformly and reliably.

  The gas sealing portion 15 is a bag-like member formed of an elastic material having elasticity such as rubber, and the airtightness between the inside and the outside of the bag is maintained. For this reason, by disposing the gas enclosure 15 inside the liquid enclosure 14 (that is, the liquid enclosure 10), the gas enclosure 15 is isolated from the liquid enclosure 10 inside the liquid enclosure 14. A closed space is formed. Further, the gas sealing part 15 may be configured to use a diaphragm, a piston, and a cylinder.

  The gas enclosure 15 communicates with the outside of the liquid enclosure 14 through a piping member 19, and a valve 16 is disposed in the middle of the piping member 19. With such a configuration, the valve 16 is “open”, and the pressure of the gas sealed in the gas sealing portion 15 can be adjusted by press-fitting or discharging the gas from the outside through the piping member 19. In addition, the kind of gas enclosed with the gas enclosure part of the electrode plate pressurization apparatus which concerns on this invention is not specifically limited, Various gas, such as air and an inert gas, can be applied.

  In this embodiment, the pressure adjusting device 17 is used to connect the pressure adjusting device 17 to the gas enclosure 15 via the valve 16 and the piping member 19, and the pressure in the gas enclosure 15 is set to a predetermined pressure (hereinafter referred to as “pressure”). , Called initial pressure). After the adjustment of the initial pressure is completed, the valve 16 is set to “closed” and the pressure adjusting device 17 is removed.

  With such a configuration, the pressure of the incompressible liquid in the liquid enclosure 10 is adjusted according to the initial pressure of the gas enclosure 15, and the bulging state of the elastic sheet 11 of the pressurizer 3 is changed. Thus, the pressure fluctuation in the liquid enclosure 10 is adjusted (absorbed) by the volume change of the compressible gas (that is, the gas enclosure 15). Thereby, it is set as the structure which hold | maintains the pressurization force with respect to the electrode plate 7 by the pressurization part 3 equally and uniformly.

  That is, in the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention, the gas sealing portion 15 formed of an elastically deformable film body and disposed in the liquid sealing portion 10 and the gas sealing portion 15 are sealed. The pressure accumulating portion 13 as a pressure accumulating device for absorbing the pressure fluctuation in the liquid enclosing portion 10 is constituted by the gas.

That is, in the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention, the pressure accumulating portion 13 as the pressure accumulating device is disposed inside the liquid enclosing container 14 as the second liquid enclosing portion and the liquid enclosing container 14. And the gas sealing portion 15 to be formed.
With such a configuration, the required volume of the gas sealing part 15 can be easily ensured. Thereby, the applied pressure to the electrode plate 7 can be held uniformly and reliably. This also makes it possible to employ a general-purpose accumulator or the like for the pressure accumulating unit 13.

Next, the use situation of the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram showing a use situation of the electrode plate pressurizing apparatus according to the first embodiment of the present invention.
As shown in FIG. 2, when the electrode plate pressing device 1 is used, first, the first restraint plate 4 is lowered with respect to the second restraint plate 5, and the electrode plate 7 is sandwiched between the pressurizing surfaces 4a and 5a. And At this time, the arrangement (position in the vertical direction) of the first restraint plate 4 is held at a desired position by fastening the nuts 9, 9. In addition, the separation distance between the pressure surfaces 4a and 5a at this time is determined by positively applying pressure depending on the fastening of the nuts 9 and 9 in consideration of the design thickness of the electrode plate 7 and the like. There is no separation distance.

  Next, the pressure adjusting device 17 is connected to the valve 16, and the valve 16 is set to “open”, and then the gas is fed into the gas sealing portion 15 through the piping member 19 by the pressure adjusting device 17. And when the pressure in the gas enclosure 15 rises and the volume of the gas enclosure 15 expands, the liquid enclosed in the liquid enclosure 10 is pressurized.

Thereby, the elastic sheet 11 of the pressurizing unit 3 swells toward the electrode plate 7, and the electrode plate 7 is pressed by the liquid in the elastic sheet 11 and the liquid sealing unit 10. In this way, the electrode plate 7 is evenly pressurized by the pressurizing unit 3.
In the case of this example, when the volume of the gas sealing part 15 expands, the liquid inside the liquid sealing container 14 is pumped to the concave part which is the first liquid sealing part in the first restraining plate 4, and the electrode plate 7 is pressed. The Rukoto.
Further, the pressure applied to the electrode plate 7 by the pressurizing unit 3 is adjusted by changing the degree of swelling of the elastic sheet 11. And after adjusting the initial pressure of the gas sealing part 15 so that the pressurization force with respect to the electrode plate 7 by the pressurization part 3 may turn into a desired pressurization, while stopping the air supply by the pressure adjustment apparatus 17, valve | bulb 16 “Closed”.

  After the initial pressure of the gas sealing part 15 is adjusted, for example, if the electrode plate 7 expands and deforms, the expansion and deformation are transmitted to the liquid in the liquid sealing part 10 via the elastic sheet 11, and By finally being transmitted to the gas enclosure 15, the expansion state (volume) of the gas enclosure 15 changes. Further, when the electrode plates 7 are energized and generate heat, the volume of the gas sealing portion 15 similarly changes even when the restraint plates 4 and 5 are deformed.

  Conventionally, if the electrode plate 7 expands and deforms, or if each of the restraining plates 4 and 5 is deformed, the pressure applied to the electrode plate 7 fluctuates. By absorbing the expansion and deformation and deformation of each of the restraining plates 4 and 5 by the volume change of the gas enclosing portion 15, it is possible to prevent fluctuations in the pressure applied to the electrode plate 7 by the pressurizing portion 3.

  The effect of preventing the fluctuation of the pressurizing force can be obtained semipermanently thereafter as long as the initial pressure of the gas sealing portion 15 is set. At this time, a complicated control device or the like is also unnecessary. Furthermore, since the pressure adjusting device 17 is required only when setting the initial pressure, it is not necessary to provide the pressure adjusting device 17 individually for each electrode plate pressurizing device 1.

  Thus, the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention has a simple configuration that does not require a complicated control device and the like, and the applied pressure to the electrode plate 7 having a laminated structure is uniform and constant. It can be held in. Furthermore, since the electrode plate pressurizing apparatus 1 does not require a complicated control device or the like, the electrode plate pressurizing apparatus 1 has high reliability with respect to failure or the like. In addition, such an effect can be similarly obtained in each electrode plate pressurizing apparatus according to the second and third embodiments described below.

Next, the overall configuration of the electrode plate pressurizing apparatus according to the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic diagram showing the overall configuration of the electrode plate pressurizing apparatus according to the second embodiment of the present invention.
As shown in FIG. 3, the electrode plate pressurizing device 21 according to the second embodiment of the present invention includes a restraining device 22, a pressurizing unit 23, a pressure accumulating unit 33, and the like.

First, the restraining device 22 will be described.
The restraint device 22 includes a first restraint plate 24, a second restraint plate 25, support members 26, 26..., And the like, and a portion of a gap formed by the first restraint plate 24 and the second restraint plate 25 is an electrode plate. 27 is an electrode plate placement portion 28 on which 27 is placed. Here, the electrode plate 27 applied to the electrode plate pressurizing device 21 includes a positive electrode plate 27a, a negative electrode plate 27b, a separator 27c, and the like.

  The first constraining plate 24 and the second constraining plate 25 are substantially rectangular steel members in plan view, and the pressure surfaces 24a and 25a are parallel to each other so that the surfaces facing each other are the pressure surfaces 24a and 25a. It is supported by the supporting members 26, 26.

  The second constraining plate 25 forms a base portion of the electrode plate placement portion 28 on which the electrode plate 27 is disposed, and an insulating sheet 32 is provided on the pressing surface 25a. The insulating sheet 32 can be omitted as appropriate according to the specifications of the electrode plate 27 and the restraining plates 24 and 25 for the reason described in the first embodiment.

  The supporting members 26, 26,... Are members that project perpendicularly to the pressing surface 25a at the four corners of the second restraining plate 25, and employ substantially round bar-shaped members in which female screws are engraved. ing. Then, nuts 29, 29,... Are screwed into the support members 26, 26,.

  In the four corners corresponding to the arrangement of the support members 26, 26,... Of the first restraining plate 24, holes 24b, 24b,. Then, the support members 26, 26,... Are inserted into the holes 24b, 24b, and the pressurizing surface 24a of the first constraining plate 24 and the pressurizing surface 25a of the second constraining plate 25 face each other. The restraint plates 24 and 25 are assembled.

  At this time, the nuts 29, 29,... Screwed into the support members 26, 26,. By adjusting the screwing position (height), the separation distance between the first restraining plate 24 and the second restraining plate 25 can be adjusted, and the nuts 29 and 29 on both the upper and lower sides can be adjusted in a state where the adjustment of the spacing distance is completed. Is configured so that the first restraining plate 24 can be held at a desired position.

  That is, in the electrode plate pressurizing device 21 according to the second embodiment of the present invention, the first constraining plate 24 and the second constraining plate 25 are separated by the support members 26, 26,. A holding unit 40 as a holding device for adjusting and holding the distance is configured. And the electrode plate 27 is arrange | positioned in the clearance gap (namely, electrode plate arrangement | positioning part 28) formed between each pressurization surface 24a * 25a in the state which hold | maintained the 1st restraint plate 24 in the desired position.

Next, the pressurizing unit 23 will be described.
Below the first restraining plate 24, a bag-like elastic bag 31 arranged in parallel to the pressurizing surface 24a is disposed, and a liquid sealing portion in which liquid is sealed inside the elastic bag 31 30 is formed. In other words, in the electrode plate pressurizing apparatus 21 according to the second embodiment of the present invention, the pressurizing part 23 is formed by disposing the elastic bag 31 in which the liquid is sealed inside the pressurizing surface 24a. Yes. By setting it as such a structure, according to the pressure of the liquid enclosed with the liquid enclosure part 30, the expansion amount of the elastic bag 31 can be changed.
Then, with the first restraint plate 24 held at a desired position, the electrode plate 27 is placed in a gap (that is, the electrode plate placement portion 28) formed between the elastic bag 31 and the pressure surface 25a of the second restraint plate 5. Is placed.

  The pressurizing unit 23 can adjust the pressure applied to the electrode plate 7 by adjusting the bulge amount of the elastic bag 31. In other words, the pressurizing unit 23 can transmit the expansion and deformation of the electrode plate 27 to the liquid sealed in the liquid sealing unit 30 via the elastic bag 31. In this embodiment, the pressurizing portion 23 is formed only below the pressurizing surface 24a on the first restraining plate 24 side. For example, the pressurizing portion 23 and the pressurizing surface 25a on the second restraining plate 25 side are provided. It is also possible to form a similar pressurizing part, or to form a pressurizing part similar to the pressurizing part 23 on both pressurizing surfaces 24a and 25a.

  That is, in the electrode plate pressurizing apparatus 21 according to the second embodiment of the present invention, the electrode plate includes the liquid enclosure 30 formed in the elastic bag 31 and the liquid enclosed in the liquid enclosure 30. The pressurizing unit 23 is configured as a pressurizing device for pressurizing 27.

Next, the pressure accumulating unit 33 will be described.
The pressure accumulating unit 33 includes a liquid enclosure 34 serving as a second liquid enclosure and a gas enclosure 35 that forms an independent space in the liquid enclosure 34.
The liquid enclosure 34 communicates with the inside of the elastic bag 31 (that is, the liquid enclosure 30) through the piping member 38. In other words, not only the inside of the elastic bag 31 but also the internal space of the liquid enclosure 34 is formed as an integral liquid enclosure 30.

  The gas sealing part 35 is a bag-shaped member formed of an elastic material having elasticity such as rubber, and the airtightness between the inside and the outside is maintained. For this reason, the gas enclosure 35 is isolated from the liquid enclosure 30 inside the liquid enclosure 34 by disposing the gas enclosure 35 inside the liquid enclosure 34 (that is, the liquid enclosure 30). A closed space is formed. Moreover, as the gas sealing part 35, it can also be set as the structure which uses a diaphragm, a piston, and a cylinder.

  The gas enclosure 35 communicates with the outside of the liquid enclosure 34 through a piping member 39, and a valve 36 is disposed in the middle of the piping member 39. With such a configuration, the valve 36 is opened, and the pressure of the gas sealed in the gas sealing portion 35 can be adjusted by press-fitting or discharging the gas through the piping member 39 from the outside.

  In this embodiment, the pressure regulator 37 is connected to the gas enclosure 35 via the valve 36 and the piping member 39 to adjust the pressure in the gas enclosure 35 to the initial pressure. It is configured. After the adjustment of the initial pressure is completed, the valve 36 is set to “closed” and the pressure adjusting device 37 is removed.

  With such a configuration, the pressure of the incompressible liquid in the liquid sealing part 30 is adjusted according to the initial pressure of the gas sealing part 35, and the expansion of the elastic bag 31 of the pressurizing part 23 is changed. The pressure variation in the liquid enclosure 30 is adjusted (absorbed) by changing the volume of the compressible gas (that is, the gas enclosure 35). Thereby, it is set as the structure which hold | maintains the pressurization force with respect to the electrode plate 27 by the pressurization part 23 equally and uniformly.

  That is, in the electrode plate pressurizing device 21 according to the second embodiment of the present invention, the gas sealing portion 35 formed of an elastically deformable film body and disposed in the liquid sealing portion 30 and the gas sealing portion 35 are sealed. The gas accumulating portion 33 as a pressure accumulating device for absorbing the pressure fluctuation in the liquid enclosure 30 is constituted by the gas. As the pressure accumulating unit 33, a general-purpose accumulator or the like can be employed.

Next, the overall configuration of the electrode plate pressurizing apparatus according to the third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram showing the overall configuration of an electrode plate pressurizing apparatus according to a third embodiment of the present invention.
As shown in FIG. 4, an electrode plate pressurizing device 41 according to a third embodiment of the present invention is configured by a restraining device 42, a pressurizing portion 43, and the like.

First, the restraining device 42 will be described.
The restraint device 42 includes a first restraint plate 44, a second restraint plate 45, support members 46, 46... And the like, and a gap portion formed by the first restraint plate 44 and the second restraint plate 45 is disposed on the electrode plate. An electrode plate placement portion 48 in which 47 is placed is used. Here, the electrode plate 47 applied to the electrode plate pressurizing device 41 includes a positive electrode plate 47a, a negative electrode plate 47b, a separator 47c, and the like.

  The first constraining plate 44 and the second constraining plate 45 are substantially rectangular steel members in plan view, and the surfaces facing each other are used as the pressure surfaces 44a and 45a so that the pressure surfaces 44a and 45a are parallel to each other. It is supported by support members 46, 46.

  The first constraining plate 44 is composed of a liquid sealing member 44d and a gas sealing member 44e, and is configured integrally with the liquid sealing member 44d on the lower side and the gas sealing member 44e on the upper side.

A liquid sealing portion 50 is formed in the liquid sealing member 44d, and a gas sealing portion 55 is formed in the gas sealing member 44e.
An elastic sheet 59 is provided on the surface where the overlapping liquid sealing member 44d and the gas sealing member 44e come into contact with each other, and the liquid sealing part 50 and the gas sealing part 55 are separated by the elastic sheet 59.

  The second constraining plate 45 forms a base portion of the electrode plate arrangement portion 48 on which the electrode plate 47 is arranged, and an insulating sheet 52 is provided on the pressing surface 45a. The insulating sheet 52 can be omitted as appropriate according to the specifications of the electrode plate 47 and the restraint plates 44 and 45 for the reason described in the first embodiment.

  The supporting members 46, 46,... Are members that protrude perpendicularly to the pressing surface 45a at the four corners of the second restraining plate 45, and employ substantially round bar-like members in which female screws are engraved. ing. Then, nuts 49, 49... Are screwed into the support members 46, 46.

In the four corners of the first restraining plate 44 corresponding to the arrangement of the support members 46, 46,... Holes 44b, 44b,.
Then, the support members 46, 46,... Are inserted into the holes 44b, 44b, and the pressurizing surface 44a of the first restraining plate 44 and the pressurizing surface 45a of the second restraining plate 45 face each other. Restraint plates 44 and 45 are assembled.

  At this time, the nuts 49, 49... Screwed into the support members 46, 46. By adjusting the screwing position (height), the separation distance between the first restraining plate 44 and the second restraining plate 45 can be adjusted, and the nuts 49 and 49 on both the upper and lower sides can be adjusted in a state where the adjustment of the spacing distance is completed. Are configured so that the first restraining plate 44 can be held at a desired position.

That is, in the electrode plate pressurizing device 41 according to the third embodiment of the present invention, the first constraining plate 44 and the second constraining plate 45 are separated by the support members 46, 46... And the nuts 49, 49. A holding unit 60 as a holding device for adjusting and holding the distance is configured.
And the space formed between each pressurization surface 44a * 45a is made into the electrode plate arrangement | positioning part 48 in which the electrode plate 47 is arrange | positioned.

Next, the pressurizing unit 43 will be described.
The first constraining plate 44 is formed with a liquid sealing portion 50 that is a space open to the pressure surface 44a and in which a liquid is sealed. And the pressurization part 43 is formed by arrange | positioning the elastic sheet 51 so that the open part of this liquid enclosure part 50 may be covered. With such a configuration, the elastic sheet 51 is expanded and contracted according to the pressure of the liquid sealed in the liquid sealing unit 50, and the bulging amount of the elastic sheet 51 with respect to the pressing surface 44a can be changed.

  The pressurizing unit 43 can adjust the pressure applied to the electrode plate 47 arranged in the electrode plate arranging unit 48 by adjusting the bulge amount of the elastic sheet 51. In other words, the pressurization unit 43 can transmit the expansion and deformation of the electrode plate 47 to the liquid sealed in the liquid sealing unit 50 via the elastic sheet 51. In this embodiment, the pressurizing portion 43 is formed only on the pressurizing surface 44a on the first restraining plate 44 side. For example, the pressurizing portion 45a on the second constraining plate 45 side is similar to the pressurizing portion 43. It is also possible to form a pressurizing unit, or to form a pressurizing unit similar to the pressurizing unit 43 on both the pressurizing surfaces 44a and 45a.

  That is, in the electrode plate pressurizing device 41 according to the third embodiment of the present invention, the electrode plate 47 is pressed by the liquid enclosure 50, the elastic sheet 51, and the liquid enclosed in the liquid enclosure 50. The pressurizing unit 43 as a pressurizing device is configured.

Next, the pressure accumulating unit 53 will be described.
The pressure accumulating portion 53 includes a gas sealing portion 55 formed in the gas sealing member 44 e of the first restraining plate 44 and an elastic sheet 59 that separates the gas sealing portion 55 and the liquid sealing portion 50.

The gas sealing portion 55 is a space formed in the gas sealing member 44 e of the first restraining plate 44. The gas sealing member 44e is formed with a hole 44c communicating with the gas sealing part 55, and a piping member 58 and a valve 56 are connected to the hole 44c. When the valve 56 is set to “closed”, a closed space in which airtightness with the outside is maintained is formed by the gas sealing portion 55, the valve 56, the piping member 58 and the elastic sheet 59.
Further, if the valve 56 is set to “open”, the gas can be press-fitted or discharged from the outside through the piping member 58 and the hole 44 c, so that the gas is sealed in the gas sealing portion 55. The gas pressure can be adjusted.

  In this embodiment, the pressure regulator 57 is connected to the gas enclosure 55 via the valve 56, the piping member 58, etc., and the pressure in the gas enclosure 55 is set to a predetermined initial pressure. The configuration is adjusted. Then, after the adjustment of the initial pressure is completed, the valve 56 is closed and the pressure adjusting device 57 is removed.

  With such a configuration, the elastic sheet 59 bulges toward the liquid enclosure 50 in accordance with the initial gas enclosure pressure with respect to the gas enclosure 55, so that the pressure of the incompressible liquid in the liquid enclosure 50 is reduced. Can be adjusted. Further, the pressure fluctuation in the liquid sealing portion 50 due to the change in the swelling state of the elastic sheet 51 of the pressurizing portion 43 is caused by the change in the swelling state of the elastic sheet 59 (that is, a compressible gas (that is, the gas sealing portion). 55), the volume is adjusted (absorbed). Thereby, it is set as the structure which hold | maintains the pressurization force with respect to the electrode plate 47 by the pressurization part 43 equally and uniformly.

  That is, in the electrode plate pressurizing device 41 according to the third embodiment of the present invention, an elastic sheet 59 that is an elastically deformable film body, and a gas sealing portion 55 that is in contact with the liquid sealing portion 50 via the elastic sheet 59 The gas sealed in the gas sealing part 55 constitutes a pressure accumulating part 53 that is a pressure accumulating device for absorbing pressure fluctuations in the liquid sealing part 10.

  Further, according to the configuration of the electrode plate pressurizing device 41 according to the third embodiment of the present invention, it is not necessary to provide a separate liquid enclosure, so that each electrode plate pressurizing according to the first and second embodiments is provided. Compared to the devices 1 and 21, a more compact device configuration can be achieved.

That is, each of the electrode plate pressurizing devices 1, 21, and 41 according to the first, second, and third embodiments of the present invention includes the electrode plates 7a, 7b, 27a, 27b, 47a, and 47b, and the separators 7c, 27c, 47c, and electrode plates 7, 27, 47 formed by laminating each electrode plate pressurizing device 1, 21, 41 for pressurizing in the laminating direction. The distance between each first restraint plate 4, 24, 44 and each second restraint plate 5, 25, 45, and each first restraint plate 4, 24, 44 and each second restraint plate 5, 25, 45 is adjusted. In addition, the restraining devices 2, 22, and 42 having the holding portions 20, 40, and 60 that can be held, the first restraining plates 4, 24, 44, and the second restraining plates 5, 25, 45, at least one of the first restraining plates 4, 24 and 44 and each of the second restraining plates 5 and 2. Each liquid enclosure as a space capable of holding a liquid formed between each electrode plate placement portion 8, 28, 48, which is a portion where each electrode plate 7, 27, 47 formed between 45 is placed Parts 10, 30, 50, and elastic sheets 11, 51, or elastic bags 31, each of which is an elastically deformable film body that forms at least a part of a partition wall forming each liquid sealing part 10, 30, 50. Each gas enclosure capable of holding a gas in a space formed by an elastically deformable film body at a portion in contact with each of the pressurizing units 3, 23, and 43 as a pressurizing device and the liquid enclosing units 10, 30, and 50 The pressure accumulating units 13, 33, and 53 that are pressure accumulating devices having the units 15, 35, and 55 are provided.
With such a configuration, the liquid resulting from the expansion and heat generation of the electrode plates 7, 27, and 47 and the volume changes of the restraining devices 2, 22, and 42 are absorbed by the volume changes of the gas sealing portions 15, 35, and 55. In addition, it is possible to adjust the factor that the applied pressure fluctuates only by the element that operates passively. In addition, this makes it possible to configure the electrode plate pressurizing devices 1, 21, 41 with high reliability with a simple configuration.

  In addition, in each Example, although the electrode plate pressurization apparatus of the structure which hold | maintains an electrode plate in a horizontal direction is illustrated, the attitude | position which an electrode plate hold | maintains is not limited to this, Each electrode plate pressurization is illustrated. It is also possible to flip the configuration of the apparatus upside down or to roll it horizontally.

  Next, an application example of the electrode plate pressurizing apparatus according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a schematic view showing an application example of the electrode plate pressurizing device according to the first embodiment of the present invention (when applied to an electrode plate evaluation device), and FIG. 6 is an electrode plate adding device according to the first embodiment of the present invention. It is a schematic diagram which shows the application example (when applied to a battery) of a pressure device.

  As shown in FIG. 5, when the electrode plate pressurizing apparatus 1 according to the first embodiment of the present invention is used together with the electrochemical measuring device 80, an electrode plate performance evaluating apparatus 81 for evaluating the performance of the electrode plate 7 is configured. be able to. The electrode plate performance evaluation device 81 having such a configuration can evaluate the performance of the electrode plate 7 with high accuracy because the pressure applied to the electrode plate 7 is held uniformly and constant by the electrode plate pressurizing device 1. In addition, since the configuration of the electrode plate pressurizing device 1 is a simple configuration that does not require the individual provision of the pressure adjusting device 17, it is also easy to prepare a plurality of electrode plate pressurizing devices 1 simultaneously and at a low cost. It is also possible to simultaneously evaluate a large number of electrode plates 7, 7... With a simple device configuration.

  In addition, as shown in FIG. 6, the electrode plate pressurizing device 1 according to the first embodiment of the present invention can be incorporated in a case 101 constituting a battery 100. In the battery 100 having such a configuration, the inside 102 of the case 101 is filled with the electrolytic solution, and the electrode plate pressurizing device 1 is accommodated, and the pressure applied to the electrode plate 7 is held uniformly and constant by the electrode plate pressurizing device 1. Therefore, stable performance can be demonstrated. Moreover, since the structure of the electrode plate pressurization apparatus 1 is a simple structure which does not need to provide the pressure adjustment apparatus 17 separately, while contributing to the cost reduction of the battery 100, the reliable battery 100 is provided. Is feasible. In addition, it is also possible to make it the structure which combines the one pressure accumulating part 13 with respect to the some electrode plate pressurization apparatus 1. FIG.

  The electrode plate pressurizing device according to the present invention can be used as an electrode plate performance evaluation device for evaluating the performance of a battery, a capacitor, etc. by using it together with an electrochemical measuring instrument. It can also be used as a pressurizing unit for pressurizing the electrode plate built in a battery or the like.

DESCRIPTION OF SYMBOLS 1 Electrode plate pressurization device 2 Restraint device 3 Pressurization part 4 1st restraint plate 5 2nd restraint plate 6 Support member 7 Electrode plate 8 Electrode plate arrangement | positioning part 10 Liquid enclosure part 11 Elastic sheet 13 Accumulation part 14 Liquid enclosure container 15 Gas Encapsulation part

Claims (5)

An electrode plate formed by laminating an electrode plate and a separator,
An electrode plate pressing device for pressing in the stacking direction,
A pair of first and second restraining plates facing in parallel;
A holding device capable of adjusting and holding a separation distance between the first and second restraint plates;
A restraint device having
Formed between at least one of the first and second restraint plates and an electrode plate placement portion which is formed between the first and second restraint plates and where the electrode plates are placed. A first liquid enclosure that is a space capable of holding liquid;
An elastically deformable film body that constitutes at least a portion facing the electrode plate placement portion of the partition walls forming the first liquid enclosing portion;
A pressurizing device having
A second liquid enclosure that is a space capable of holding the liquid in communication with the first liquid enclosure;
A gas-sealed portion that is built in the second liquid-sealed portion and is a space formed by an elastically deformable film body that is in contact with the liquid held in the second liquid-sealed portion and can hold gas. A pressure accumulator having;
Comprising
An electrode plate pressurizing device. The first liquid enclosure is
A recess formed in at least one of the first and second restraining plates and opened toward the electrode plate placement portion;
The elastically deformable film body that constitutes the partition wall forming the first liquid enclosing portion covers the entire opening of the recess,
The electrode plate pressurizing apparatus according to claim 1. The second liquid enclosure is
The first liquid enclosure is a separate container,
The electrode plate pressurizing device according to claim 1, wherein the electrode plate pressurizing device is provided. An electrode plate formed by laminating an electrode plate and a separator,
An electrode plate pressing device for pressing in the stacking direction,
A pair of first and second restraining plates facing in parallel;
A holding device capable of adjusting and holding a separation distance between the first and second restraint plates;
A restraint device having
Formed between at least one of the first and second restraint plates and an electrode plate placement portion which is formed between the first and second restraint plates and where the electrode plates are placed. A liquid enclosure that is a space that can hold liquid;
An elastically deformable film body that constitutes at least a portion facing the electrode plate arrangement portion among the partition walls forming the liquid sealing portion;
A pressurizing device having
On the opposite side of the liquid enclosure portion from the side facing the electrode plate placement portion, the space that is in contact with the liquid enclosed in the liquid enclosure portion and that is in contact with the liquid is a space formed by an elastically deformable film body. And a pressure accumulator having a gas sealing part capable of holding gas,
Comprising
An electrode plate pressurizing device. The gas sealing part is
A recess formed in at least one of the first and second restraining plates and opened toward the electrode plate placement portion;
The film body constituting the gas-filled portion,
Covering the entire opening of the recess,
The electrode plate pressurizing apparatus according to claim 4.

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