JP2000090957A - Measuring device for internal cavity volume of battery and measuring method thereof, and manufacturing device for battery and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the high reliability of a battery by stably measuring an internal cavity amount of the battery without any influence of the dispersion of members for use. SOLUTION: Regarding a device for measuring the internal cavity volume V0 of a battery 10 constituted with a wound group 14 sealed in a battery can 12 shaped like a bottomed cylinder together with an electrolyte, a pressure detection part 102 for detecting a first pressure P0 based on the first reference capacity V1 and the cavity volume V0 in the battery 10, and a second pressure P1 based on the second reference capacity (V1+V2) and the cavity volume V0 in the battery 10 are provided, together with a cavity volume calculating part 2104 for calculating the cavity volume V0 based on at least the first pressure and the second pressure P0 and P1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring the amount of internal void of a battery constituted by enclosing a winding group together with an electrolyte in a battery can having a bottomed cylindrical shape, and a method thereof. The present invention relates to a battery manufacturing apparatus for manufacturing a battery by using a battery internal void amount measuring apparatus and a manufacturing method thereof.

[0002]

2. Description of the Related Art For example, a lithium battery comprises a winding group in which a positive electrode plate and a negative electrode plate provided with current collecting leads (a positive electrode lead and a negative electrode lead) are wound with a separator interposed therebetween. The battery is inserted into the battery can.

[0003] In the case of manufacturing the above-mentioned lithium battery, usually, a winding group in which a positive electrode plate and a negative electrode plate are wound through a separator is produced, and then this winding group is placed in a bottomed cylindrical battery can. Is inserted into.

[0004] Next, an annular groove is formed near the opening of the battery can, and after the negative electrode lead is spot-welded to the inner bottom of the battery can, an electrolyte is injected. Further, a sealing plate is welded to the positive electrode lead, and various sealing components including a safety valve (PTC ring) are inserted into the battery can and subjected to sealing and caulking, thereby completing the above-described lithium battery.

[0005] Incidentally, the safety valve of the battery is devised so as to operate by generating gas from the winding group at the time of overcurrent. In order for the safety valve of the battery to operate normally, it is necessary to keep the amount of void in the battery constant and to keep the pressure rise in the battery due to gas generation constant.

Conventionally, the capacity of the battery and the volume of the winding group have been calculated, and the amount of the electrolyte has been controlled to control the amount of voids in the battery.

[0007]

However, in the above-mentioned conventional method, there is a possibility that the operating pressure of the safety valve may vary because of the influence of the variation of the members used.

The present invention has been made in view of such a problem, and it is possible to stably measure the amount of internal voids of a battery without being affected by variations in members used. An object of the present invention is to provide an apparatus and a method for measuring the amount of internal voids in a battery that can achieve reliability.

Another object of the present invention is to provide a highly reliable battery using a measuring device capable of stably measuring the amount of internal voids of a battery without being affected by variations in members used. It is an object of the present invention to provide a battery manufacturing apparatus and a manufacturing method thereof capable of manufacturing a battery.

[0010]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for measuring the amount of internal void of a battery constituted by enclosing a winding group together with an electrolyte in a battery can having a bottomed cylindrical shape. 1 based on a reference volume of 1 and a void amount in the battery.
Pressure detecting means for detecting a second pressure based on the first reference pressure and a second reference volume, and a second pressure based on the gap amount in the battery, and calculating the internal gap amount based on at least the first and second pressures. It is configured by providing a gap amount calculating means.

Thus, first, the first reference volume and the first volume based on the void amount in the battery are detected through the pressure detecting means.
, And a second pressure based on the second reference volume and the void amount in the battery. Thereafter, the gap amount of the battery is calculated based on at least the first and second pressures through the gap amount calculation means.

In this case, the variation caused by the variation of the member related to the detected first pressure and the variation caused by the variation of the member related to the detected second pressure are calculated by the gap amount calculating means. Since the offsets are offset, the internal void amount of the battery can be stably measured without being affected by the variation of the members used, and high reliability of the battery can be achieved.

The pressure detecting means includes a cylinder mounted on an opening of the battery can in which the winding group is housed, and communicating with the inside of the battery can. A piston forming the first reference volume and the second reference volume, and a pressure gauge for detecting the pressure in the cylinder may be provided.

When measuring the amount of the internal void of the battery, a cylinder is attached to the opening of the battery can, and the inside of the cylinder and the inside of the battery can are communicated. Thereafter, the piston is operated to form a first reference volume in the cylinder, and the pressure in the cylinder at that time is detected through a pressure gauge. This is the first pressure. Further, the piston is operated to form a second reference volume in the cylinder, and the pressure in the cylinder at that time is detected through a pressure gauge. This is the second pressure.

Then, through the air gap amount calculating means at the subsequent stage,
The internal void amount of the battery is calculated based on at least the first and second pressures.

In this case, since the first pressure and the second pressure can be easily detected, it is possible to effectively reduce the cost for accurately measuring the amount of internal void of the battery.

Next, the present invention relates to a method for measuring the amount of internal voids in a battery constituted by enclosing a winding group together with an electrolytic solution in a battery can having a bottomed cylindrical shape. Detecting a first pressure based on a volume and a void amount in the battery, and a second pressure based on a second reference volume and a void amount in the battery, based on at least the first and second pressures; Calculating the amount of internal voids.

In this case, it is possible to perform measurement for making the internal void amount of the battery constant without being affected by the variation of the members used, and it is possible to achieve high reliability of the battery.

Next, according to the present invention, there is provided an apparatus for manufacturing a battery comprising a battery can having a bottomed cylindrical shape and a winding group enclosed with an electrolytic solution, wherein the first reference volume and the gap in the battery are provided. Pressure detecting means for detecting a first pressure based on the amount, a second reference volume and a second pressure based on the void amount in the battery, and the internal pressure based on at least the first and second pressures. A gap amount measuring device having a gap amount calculating means for calculating a gap amount, and calculating an injection amount of the electrolytic solution based on an internal gap amount from the gap amount measuring device, and calculating an amount corresponding to the calculated injection amount. And an electrolyte injection device for injecting the electrolyte into the battery can.

Accordingly, first, the first pressure based on the first reference volume and the void amount in the battery, the second reference volume, and the void amount in the battery through the pressure detecting means in the void amount measuring device. Are detected respectively. Then, the internal void amount of the battery is calculated based on at least the first and second pressures through the void amount calculating means.

Then, in the electrolyte injection device, the injection amount of the electrolyte is calculated based on the internal void amount from the void amount measurement device, and the electrolyte solution corresponding to the injection amount is stored in the battery can. Injected.

[0022] In this case, in the void amount measuring apparatus,
The variation caused by the variation of the member related to the detected first pressure and the variation caused by the variation of the member related to the detected second pressure are offset by the calculation by the gap amount calculating means. Therefore, the amount of the internal void of the battery is measured without being affected by the variation of the members used. That is, the internal void amount of the battery is measured with high accuracy.

Therefore, the amount of the electrolyte to be injected into the battery can be accurately calculated in the latter electrolyte injection device, and the operating pressure of the safety valve of the battery can be kept constant. A reliable battery can be manufactured.

The pressure detecting means in the air gap measuring device may include a cylinder mounted on an opening of the battery can in which the winding group is accommodated and communicating with the inside of the battery can. And a piston forming the first reference volume and the second reference volume in the cylinder, and a pressure gauge for detecting a pressure in the cylinder.

Next, according to the present invention, in a battery manufacturing apparatus constituted by enclosing a winding group together with an electrolytic solution in a battery can having a bottomed cylindrical shape, a first reference volume and an electrolytic solution in the battery are provided. A first pre-injection pressure based on the void volume before liquid injection, and a second pre-injection pressure.
And a second pre-injection pressure detecting means for detecting a reference volume and a second pre-injection pressure based on a void amount in the battery before the electrolyte is injected, and the electrolysis based on at least the first and second pre-injection pressures. A first void volume measuring device having void volume calculating means for calculating the void volume before liquid injection, and the electrolyte solution based on the void volume before the electrolytic solution injection from the first void volume measuring device. An electrolyte injection device for calculating an injection amount and injecting an electrolyte solution corresponding to the calculated injection amount into the battery can, a third reference volume and a void amount after the electrolyte injection in the battery. A first post-injection pressure based on the first reference pressure, a fourth reference volume, and a second post-injection pressure based on the void volume of the battery after the electrolyte injection, and at least the first and second pressures. Calculating the void volume after the electrolyte injection based on the second post-injection pressure A second gap measuring device having a gap calculating means, and determining whether or not the gap amount after the injection of the electrolyte from the second gap measuring device is within a predetermined allowable range, A gap amount determining means for determining pass / fail is provided.

Thus, first, the first reference volume and the first pre-injection pressure based on the void amount in the battery before the injection of the electrolyte are passed through the pre-injection pressure detecting means of the first void amount measuring device. A second reference volume and a second pre-injection pressure based on the void volume before the electrolyte injection in the battery are detected. Thereafter, the internal void amount of the battery is calculated based on at least the first and second pre-injection pressures through the void amount calculating means.

Thereafter, in the electrolyte injection device, the injection amount of the electrolyte is calculated based on the internal void amount from the first void amount measurement device, and the electrolyte corresponding to the injection amount is supplied to the battery. Injected into the can.

Thereafter, the first post-injection pressure based on the first reference volume and the post-injection void volume in the battery, and the second post-injection pressure, through the post-injection pressure detecting means in the second void volume measurement device. A reference volume and a second post-injection pressure based on the void volume after the injection of the electrolyte in the battery are respectively detected.
After that, at least the first
And the second internal pressure of the battery is calculated based on the second post-injection pressure.

Then, it is determined through the next void amount determining means whether or not the void amount after the injection of the electrolyte from the second void amount measuring device is within a predetermined allowable range, and according to the determination result, The quality of the battery is determined.

In this case, in the first gap measuring device, the gap before the electrolyte is injected into the battery is measured without being affected by the variation of the members used. In the injection device, the injection amount of the electrolyte to be injected into the battery is accurately calculated, and the operating pressure of the safety valve of the battery can be kept constant. Then, in the subsequent second gap amount measuring device, the gap amount after the electrolyte solution is injected into the battery is measured without being affected by the variation of the members used. By this means, a battery that satisfies certain conditions can be accurately determined, and a highly reliable battery can be manufactured.

The pre-injection pressure detecting means in the first gap measuring device is attached to an opening of the battery can in which the winding group is accommodated, and communicates with the inside of the battery can. A first cylinder for forming a first reference volume and a second reference volume in the first cylinder, and a first piston for detecting a pressure in the first cylinder. And a pressure gauge.

The post-injection pressure detecting means in the second gap measuring device is mounted on an opening of the battery can in which the winding group is accommodated, and is connected to the inside of the battery can. A second cylinder communicating with the second cylinder, a second piston forming the third reference volume and the fourth reference volume in the second cylinder, and a second piston for detecting a pressure in the second cylinder. And two pressure gauges.

In this case, the first reference volume and the third
May be made substantially the same, and the second reference volume and the fourth reference volume may be made substantially the same.

Next, according to the present invention, there is provided a method for manufacturing a battery, comprising a battery can having a bottomed cylindrical shape and a winding group enclosed with an electrolytic solution, wherein a first reference volume and a gap in the battery are provided. Detecting a first pressure based on the volume, a second reference volume and a second pressure based on the void volume in the battery, and calculating the internal void volume based on at least the first and second pressures; The gap amount measurement step to be performed, the injection amount of the electrolyte solution is calculated based on the gap amount obtained in the gap amount measurement process, and the electrolyte solution corresponding to the calculated injection amount is stored in the battery can. And an electrolyte solution injecting step.

In this case, the internal void amount of the battery is measured without being affected by the variation of the members used in the void amount measuring step. Since the amount of the electrolyte to be injected is accurately calculated, the operating pressure of the battery safety valve can be kept constant, and a highly reliable battery can be manufactured.

Next, the present invention relates to a method for manufacturing a battery comprising a battery group in which a winding group is sealed together with an electrolytic solution in a battery can having a bottomed cylindrical shape. A first pre-injection pressure based on the void volume before liquid injection, and a second pre-injection pressure.
And a second pre-injection pressure based on the void volume before electrolyte injection in the battery is detected, and based on at least the first and second pre-injection pressures, a void volume before the electrolyte injection. Calculating the injection amount of the electrolytic solution based on the void amount before the injection of the electrolytic solution obtained in the first void amount measuring step, and calculating the calculated injection amount An electrolyte injection step of injecting an amount of electrolyte corresponding to the amount into the battery can; a third post-injection pressure based on a third reference volume and a void amount after injection of the electrolyte in the battery; 4 based on the reference volume of No. 4 and the void amount after the electrolyte is injected into the battery.
And the pressure after the injection is detected, and at least the first and second pressures are detected.
A second gap measuring step of calculating the gap after the electrolyte injection based on the pressure after the injection of the electrolyte, and the gap after the electrolyte injection obtained in the second gap measuring is predetermined. A gap amount inspection step of determining whether the battery is within the allowable range and determining the quality of the battery.

In this case, in the first void amount measuring step, the void amount before the injection of the electrolytic solution into the battery is measured without being affected by the variation of the members used. In the injection step, the injection amount of the electrolyte to be injected into the battery is accurately calculated, and the operating pressure of the safety valve of the battery can be kept constant. Then, in the next second gap amount measuring step, the gap amount after the electrolyte solution is injected into the battery is measured without being affected by the variation of the members used. In the above, a battery satisfying certain conditions can be accurately inspected, and a highly reliable battery can be manufactured.

The first reference volume and the third reference volume are made substantially the same, and the second reference volume and the fourth
May be made substantially the same.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION An apparatus and a method for measuring the amount of internal voids in a battery according to the present invention are applied to, for example, the measurement of the amount of internal voids in a cylindrical secondary battery (hereinafter simply referred to as a battery). An embodiment (hereinafter simply referred to as a measuring apparatus according to an embodiment), and an embodiment of a battery manufacturing apparatus and a manufacturing method thereof according to the present invention (hereinafter simply referred to as a manufacturing system according to an embodiment) will be described. This will be described with reference to FIGS.

Before describing the measuring apparatus 100 according to the present embodiment and the manufacturing system 200 according to the present embodiment,
First, the configuration of the battery 10 to which the measuring apparatus 100 and the manufacturing system 200 are applied and a method of manufacturing the battery 10 will be briefly described with reference to FIGS.

As shown in FIG. 1, the battery 10 includes a battery can 12 having a bottomed cylindrical shape, and a winding group 14 sealed in the battery can 12 together with an electrolytic solution.

The winding group 14 is configured by winding a positive electrode plate 16 and a negative electrode plate 18 with a separator 20 interposed therebetween. At the end of the positive electrode plate 16, a positive electrode lead 22 which is a metal lead is provided. A negative electrode lead 24 which is a metal lead is also provided at an end of the plate 18.

The positive electrode lead 22 extends from the center of the winding group 14 toward the opening 12a of the battery can 12, and
It is welded to the sealing unit 26. The sealing unit 26 includes various sealing components in a gasket 28, that is, a sealing plate 30 to be welded to the positive electrode lead 22, a breaker 32,
The TC ring 34 and the cap member 36 are integrally incorporated, and the sealing unit 26 is fixed to an end of the battery can 12 on the side of the opening 12a. At this time, the various sealing components are undercut, and maintain a laminated state.

The negative electrode lead 24 extends from the outer periphery of the winding group 14 to the inner bottom 12 b of the battery can 12, and
2b is spot-welded, for example.

An annular groove 38 is formed in the battery can 12 near the opening 12a. In the battery can 12, a lower insulating plate 40 and an upper insulating plate 42 are provided for the winding group 14.

Next, a method of manufacturing the battery 10 thus configured will be described with reference to FIG.

First, after a winding group 14 in which the positive electrode plate 16 and the negative electrode plate 18 are wound with the separator 20 interposed therebetween is formed, the negative electrode lead 24 of the negative electrode plate 18 is provided with the lower insulating plate 40 interposed therebetween. It is bent toward the center of the winding group 14 (FIG. 2).
Middle, see (a)).

The winding group 14 is inserted into the battery can 12, and an upper insulating plate 42 is disposed on the side of the opening 12a of the battery can 12 ((b), (c) in FIG. 2). reference).
At this time, the negative electrode lead 24 of the winding group 14 contacts the inner bottom portion 12b of the battery can 12, while the positive electrode lead 22 protrudes outward from the opening 12a of the battery can 12.

Next, the negative electrode lead 24 of the winding group 14 is spot-welded to the inner bottom 12b of the battery can 12,
After the annular groove 38 is formed in the vicinity of the opening 12a of the battery can 12, the electrolyte is injected into the battery can 12 through the electrolyte injection means 44 as shown in FIG. You. Further, as shown in FIG. 2E, the sealing unit 26 is welded to the positive electrode lead 22 of the winding group 14.

Here, as shown in FIG. 1, the sealing unit 26 has a gasket 28 in which a sealing plate 30, a breaker 32, a PTC ring 34, and a cap member 36, which are various sealing components, are laminated and integrally integrated. Have been.
Then, the positive electrode lead 22 is welded to the sealing plate 30 by, for example, laser welding.

The sealing unit constituting the sealing unit 26 includes at least a sealing plate 30 and a cap member 36 which are welded to the positive electrode lead 22, and includes a breaker 32 and a PTC ring 34, if necessary. Various sealing parts are incorporated.

After the positive electrode lead 22 is welded to the sealing unit 26, the positive electrode lead 22 is folded so that
The sealing unit 26 is disposed so as to be supported by an inner wall portion of the annular groove 38 of the battery can 12 ((f) in FIG. 2).
reference).

Next, the battery 10 as a product is manufactured by subjecting the end of the battery can 12 to the opening 12a side to be sealed and caulked (see (g) and (h) in FIG. 2). .

The measuring apparatus 10 according to the present embodiment
0 indicates that the winding group 14 is inserted into the battery can 12, for example,
Further, the amount of internal voids of the battery 10 (hereinafter, referred to as a work to distinguish it from a battery as a finished product) at a stage where the upper insulating plate 42 is provided on the opening 12a side of the battery can 12 is measured.

More specifically, as shown in FIG. 3, a first pressure P0 based on the first reference volume V1 and the void amount V0 in the work 10, a second reference volume (V1 + V2) and the work 1
A pressure detection unit 102 for detecting a second pressure P1 based on a void amount V0 in the first and second pressures P1 and P2;
And a gap calculator 104 for calculating a gap V0 of the work 10 based on 0 and P1.

The pressure detecting section 102 is mounted on the opening 12a of the battery can 12 in which the winding group 14 is accommodated, and
A cylinder 110 communicating with the inside of the battery can 12, a piston 112 forming a first reference volume V1 and a second reference volume (V1 + V2) in the cylinder 110, and a pressure for detecting a pressure in the cylinder 110 Gauge 114
And

The cylinder 110 has a piston 112 inside.
Has a hollow portion 116 for vertically moving the cylinder, and a communicating portion 118 for communicating the hollow portion 116 with the inside of the work 10. When the cylinder 110 is a cylinder, the diameter of the communicating portion 118 is Is set smaller than the diameter of the hollow portion 116. As a result, a step 120 is formed at the boundary between the hollow portion 116 and the communication portion 118.

The outer diameter of the piston 112 is set to be substantially the same as the diameter of the hollow portion 116. From these dimensional relationships, the stage at which the tip end surface of the piston 112 abuts on the step 120 indicates the stage on the stroke of the piston 112. It can be a bottom dead center. The top dead center of the piston 112 is
When the upper surface of the abuts against the upper inner wall of the cylinder 110,
The stage at which the piston rod 122 hits an arbitrarily set stopper (not shown) outside the cylinder 110 can be arbitrarily determined.

The communication portion 118 is provided with a communication hole 124 connected to a pressure gauge 114 installed outside the side wall of the communication portion 118. The pressure inside the cylinder 110 when the piston 112 is at the bottom dead center and the top dead center is provided. Can be detected through the pressure gauge 114. This pressure gauge 11
4 is supplied to the air gap amount calculation unit 104 at the subsequent stage.

A seal member 126 is provided on the lower surface of the cylinder 110 at a portion which comes into contact with the opening 12a of the battery can 12.
Is embedded, and an O-ring 128 is
Is attached, whereby the cylinder 110 is attached to the battery can 12.
The airtightness is maintained between the inside of the battery can 12 and the inside of the cylinder 110 when it is brought into contact with the opening 12a.

Here, the measuring apparatus 10 according to the present embodiment
The principle of detecting the internal void amount of the battery 10 at 0 will be described. First, the lower surface of the cylinder 110 is brought into contact with the opening 12a of the battery can 12, and the inside of the cylinder 110 and the inside of the battery can 12 are communicated with each other and sealed. From this stage, the piston 112 is moved to, for example, be located at the bottom dead center, and the first pressure detected by the pressure gauge 114 at this time is set to P0. In the cylinder 110, the volume after the lower surface of the piston 112 is the sum of the volume (first reference volume) V1 of the communicating portion and the void amount V0 of the battery.

Next, the piston 112 is moved to a position, for example, at the top dead center, and the second pressure detected by the pressure gauge 114 at this time is set to P1. In the cylinder 110, the volume after the lower surface of the piston 112 is the sum of the volume V1 of the communicating portion, the volume V2 of the hollow portion after the lower surface of the piston, and the void amount V0 of the battery.

The following equation (1) can be derived from Boyle's law, and the void amount V0 of the work 10 can be obtained from the equation (1) (see equation (2)).

P0 (V0 + V1) = P1 (V0 + V1 + V2) (1) V0 = {P1 · V2 / (P0−P1)} − V1 (2) On the other hand, the void amount calculation unit 104 is not shown inside. Has memory. In the array variable area of this memory, cylinder 1
Ten volumes V1 and V2 are registered in advance.

Then, the air gap amount calculation unit 104 receives a detection signal when the piston 112 reaches the bottom dead center from the detection signals from the pressure gauge 114 as a signal indicating the first pressure P0. Receives the detection signal at the time of reaching the top dead center as a signal indicating the second pressure P1, and calculates the above equation (2) from the volumes V1, V2, the pressures P0, and P1 to obtain the work 10
Is obtained.

As described above, in the measuring apparatus 100 according to the present embodiment, the fluctuation due to the variation of the member related to the detected first pressure P0 and the detected second pressure P0
Since the variation due to the variation of the members related to 1 is offset by the calculation in the void amount calculation unit 104, the void amount V0 of the work 10 can be stabilized without being affected by the variation of the members used. And high reliability of the battery 10 can be achieved.

In the present embodiment, the pressure detector 10
2, a cylinder 110 which is attached to the opening 12 a of the battery can 12 in which the winding group 14 is accommodated and communicates with the inside of the battery can 12;
And a pressure gauge 114 for detecting the pressure in the cylinder 110, the piston 112 forming the reference volume V1 and the second reference volume (V1 + V2). The second pressure P1 can be easily detected, and the cost for accurately measuring the void amount V0 of the work 10 can be effectively reduced.

Next, the manufacturing system 2 according to the present embodiment
00 will be described with reference to FIG.

[0069] Manufacturing system 200 according to this embodiment.
As shown in FIG. 4, a first gap measuring device 202 for measuring the gap of the work 10 after the beading process, and an electrolyte injection device 204 for injecting the electrolyte into the battery can 12 A second gap amount measuring device 206 for measuring the gap amount of the workpiece 10 after the injection of the electrolytic solution, and the gap amount after the electrolyte solution is injected from the second gap amount measuring device 206 is a predetermined amount. A gap amount determining device 208 that determines whether the workpiece 10 is within the allowable range and determines the quality of the work 10 is provided.

The first void amount measuring device 202 can adopt the same configuration as the measuring device 100 shown in FIG. In this case, the first pressure P0 detected by the pressure gauge 114 is a first pre-injection pressure based on the first reference volume V1 and the void amount V0 in the work 10 before the electrolyte is injected,
The second pressure P1 is a second pre-injection pressure based on the second reference volume (V1 + V2) and the void amount V0 in the work 10 before the electrolyte solution is injected, and the void amount V0 taken out from the void amount calculation unit 104. Indicates the void amount V0 in the work 10 before the injection of the electrolytic solution.

This void amount V 0 is supplied to the subsequent electrolytic solution injection device 204. The electrolyte injection device 204 includes a first
V before the injection of the electrolyte from the void measuring device 202
The injection amount of the electrolyte is calculated based on 0, and the amount of the electrolyte corresponding to the calculated injection amount is injected into the battery can 12.

The second gap measuring device 206 can have the same configuration as the measuring device 100 shown in FIG. 3, but has a relationship for measuring the gap V0 of the work 10 after the electrolyte is injected. Therefore, a cylinder 220 (see FIG. 5) having a different size from the cylinder 110 (see FIG. 3) used in the first gap amount measuring device 202 may be used.

In this case, as shown in FIG.
The volume of the communication part 224 when the point 22 reaches the bottom dead center is
Unlike the first volume V1 of the communication portion 118 in the first gap measuring device 202, it can be defined as a third reference volume V3. When the piston 222 reaches the top dead center, the volume in the cylinder 220 after the lower surface of the piston 222 is different from the second reference volume (V1 + V2) in the first air gap measuring device 202, and is equal to the fourth volume. (V3 + V4).

Therefore, the second gap measuring device 206
In, the lower surface of the cylinder 220 is brought into contact with the opening 12a of the battery can 12 to seal the inside of the cylinder 220 and the inside of the battery can 12 from each other. From this stage, the piston 222 is moved to, for example, be located at the bottom dead center. At this time, assuming that the first post-injection pressure detected by the pressure gauge 226 is P2, the volume after the lower surface of the piston 222 in the cylinder 220 is equal to the volume V3 of the communication portion 224 and the work after the electrolyte injection. It is the sum of 10 and the gap amount V5.

Next, assuming that the piston 222 is moved to, for example, the top dead center and the second post-injection pressure detected by the pressure gauge 226 is P3, the cylinder 2
20, the volume after the lower surface of the piston 222 is the sum of the volume V3 of the communication portion 224, the volume V4 of the hollow portion 228 after the lower surface of the piston 222, and the gap amount V5 of the work.

The following equation (3) can be derived from Boyle's law, and from the equation (3), the work 10 after the injection of the electrolytic solution can be obtained.
Can be determined (see equation (4)).

P2 (V0 + V3) = P3 (V0 + V3 + V4) (3) V5 = {P3 · V4 / (P2-P3)} − V3 (4) Of the work after the injection of the electrolytic solution is output.

The gap determining device 208 receives the gap V5 of the work 10 output from the gap calculating section 230 of the second gap measuring device 206, and the gap V5 is within a predetermined allowable range. It is configured to determine whether or not.

Next, the processing operation of the manufacturing system 200 will be described. First, the work 10 that has completed the beading process is put into the first gap amount measuring device 202. Then, in the first gap measuring device 202, the lower surface of the cylinder 110 is brought into close contact with the opening 12 a of the battery can 12. At this stage, the first pre-injection pressure P0 and the second
Of the work 10 before the injection of the electrolytic solution is calculated. This calculation result (the void amount V0) is sent to the subsequent electrolyte injection device 204.

After the piston 112 in the cylinder 110 in the first gap amount measuring device 202 is returned to the original position, the cylinder 110 is separated from the opening 12a of the battery can 12, and from this stage, the work 10 is moved to the next electrolysis. Liquid injection device 20
4 is carried.

The electrolyte injection device 204 calculates the injection amount of the electrolyte based on the void amount V0 supplied from the first void amount measurement device 202 at the time when the workpiece 10 is transported, and discharges the electrolyte. The work is injected into the battery can 12 of the work 10 by an amount corresponding to the calculated value.

After the injection of the electrolyte, the work 10 is
Is transported to the gap amount measuring device 206. Then, in the second gap measuring device 206, the lower surface of the cylinder 110 is brought into close contact with the opening 12 a of the battery can 12. At this stage, the first post-injection pressure P2 and the second post-injection pressure P3 are detected.
Is calculated. This calculation result (gap amount V5) is sent to the gap amount determination device 208 at the subsequent stage.

If the gap amount V5 after the injection of the electrolytic solution falls within a predetermined allowable range, the gap amount determining device 208 determines the work 10 as a non-defective product.
It is put into the next sealing unit assembly process. On the other hand, if the gap amount V5 does not fall within the predetermined allowable range, the work 10 is determined to be defective, and is collected in a collection box through another conveyance path.

As described above, the manufacturing system 200 according to the present embodiment uses the first void amount measuring device 202
The void amount V0 of the work 10 before the injection of the electrolytic solution is measured without being affected by the variation of the members used. The amount of liquid injected is accurately calculated, and the operating pressure of the safety valve when the battery 10 is used can be kept constant.

Then, in the second gap measuring device 206 at the subsequent stage, the gap V5 after the injection of the electrolytic solution of the work 10 is not affected by the variation of the members used.
Is to be measured, so that the subsequent gap amount determination device 2
At 08, the work 10 satisfying a certain condition can be accurately determined, and a highly reliable battery 10 can be manufactured.

In the above example, the first gap measuring device 20
2 and the size of the cylinder 220 in the second gap measuring device 206 are made different from each other, so that the second gap measuring device 206 newly has a third reference volume V3 and a fourth reference volume ( V3 + V4), the first reference volume V1 and the third reference volume V3 may be substantially the same, and the second reference volume (V1 + V2) and the fourth reference volume (V3 + V4) may be substantially the same.

In this case, the void amount V0 of the work 10 before the injection of the electrolytic solution and the void amount V5 of the work 10 after the injection of the electrolytic solution can be measured only by the first void amount measuring device 202.
This is advantageous for reducing costs.

The apparatus and method for measuring the amount of internal voids in a battery according to the present invention, and the apparatus and method for manufacturing a battery are not limited to the above-described embodiments, but may be modified without departing from the gist of the present invention. Of course, various configurations can be adopted.

[0089]

As described above, according to the apparatus and method for measuring the amount of internal voids in a battery according to the present invention, the amount of internal voids in a battery can be stabilized without being affected by variations in the members used. And high reliability of the battery can be achieved.

Further, according to the battery manufacturing apparatus and the manufacturing method according to the present invention, there is provided a measuring apparatus capable of stably measuring the internal void amount of a battery without being affected by variations in members used. It can be used and a highly reliable battery can be manufactured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a battery to which a measurement device according to the present embodiment and a manufacturing system according to the present embodiment are applied.

FIG. 2 is a process chart showing a method for manufacturing a battery.

FIG. 3 is a configuration diagram showing a measuring device (first void amount measuring device) according to the present embodiment.

FIG. 4 is a block diagram showing a manufacturing system according to the present embodiment.

FIG. 5 is a configuration diagram showing a second gap measuring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Battery (work) 12 ... Battery can 14 ... Wound group 100 ... Measuring device 102 ... Pressure detecting part 104 ... Void amount calculating part 110 ... Cylinder 112 ... Piston 114 ... Pressure gauge 116 ... Hollow part 118 ... Communication part 200 ... Manufacturing system 202: First gap measuring device 204: Electrolyte injecting device 206: Second gap measuring device 208: Gap determining device 220: Cylinder 222: Piston 224: Communication portion 226: Pressure gauge 228: Hollow portion 230: Air gap amount calculation unit

Claims (11)

[Claims] 1. An apparatus for measuring the amount of internal voids of a battery constituted by enclosing a winding group together with an electrolytic solution in a battery can having a bottomed cylindrical shape, comprising: a first reference volume; Pressure detecting means for detecting a first pressure based on the amount of voids, a second reference volume and a second pressure based on the amount of voids in the battery, and based on at least the first and second pressures. A measuring device for calculating the internal void amount of the battery, comprising: a void amount calculating means for calculating the internal void amount. 2. The apparatus according to claim 1, wherein said pressure detecting means is mounted on an opening of said battery can in which said winding group is housed, and A cylinder communicating with the inside of the can, a piston forming the first reference volume and the second reference volume in the cylinder, and a pressure gauge for detecting a pressure in the cylinder. For measuring the amount of internal voids in a battery. 3. A method for measuring an internal void amount of a battery constituted by enclosing a winding group together with an electrolyte in a battery can having a bottomed cylindrical shape, comprising: a first reference volume; Detecting a first pressure based on the void amount of the battery, a second reference volume and a second pressure based on the void amount in the battery, and determining the internal void volume based on at least the first and second pressures. The method for measuring the amount of internal voids in a battery, comprising: 4. A battery manufacturing apparatus in which a winding group is sealed together with an electrolyte in a battery can having a bottomed cylindrical shape, wherein a first reference volume based on a first reference volume and a void amount in the battery. Pressure detecting means for detecting a second pressure based on the first reference pressure and a second reference volume, and a second pressure based on the gap amount in the battery, and calculating the internal gap amount based on at least the first and second pressures. A void amount measuring device having a void amount calculating means, calculating an injection amount of the electrolytic solution based on the internal void amount from the void amount measuring device, the electrolytic solution corresponding to the calculated injected amount, An apparatus for injecting an electrolyte into a battery can. 5. The battery manufacturing apparatus according to claim 4, wherein the pressure detecting means in the gap measuring device is mounted on an opening of the battery can accommodating the winding group therein, and A cylinder communicating with the inside of the battery can, a piston forming the first reference volume and the second reference volume in the cylinder, and a pressure gauge for detecting a pressure in the cylinder. Characteristic battery manufacturing equipment. 6. A battery manufacturing apparatus in which a winding group is enclosed together with an electrolyte in a battery can having a bottomed cylindrical shape, wherein a first reference volume and a gap before the electrolyte is injected into the battery. A first pre-injection pressure based on the amount, a second pre-injection pressure detecting means for detecting a second reference volume and a second pre-injection pressure based on the void amount in the battery before the electrolyte injection, and at least the 1
A first gap measuring device having a gap calculating means for calculating the gap before the electrolyte injection based on the second pre-injection pressure, and the electrolyte from the first gap measuring device. An electrolyte injection device for calculating an injection amount of the electrolyte solution based on the void amount before the injection, and injecting an amount of the electrolyte solution corresponding to the calculated injection amount into the battery can; a third reference volume; A first post-injection pressure based on the void volume after the electrolyte injection in the battery, and a fourth reference volume and a second post-injection pressure based on the void volume in the battery after the electrolyte injection are detected. Post-injection pressure detecting means, at least the first
And a second gap measuring device having a gap calculating means for calculating a gap after the electrolyte injection based on the second post-injection pressure, and the electrolyte from the second gap measuring device. An apparatus for manufacturing a battery, comprising: means for determining whether or not the amount of voids after injection is within a predetermined allowable range to determine the quality of the battery. 7. The battery manufacturing apparatus according to claim 6, wherein the pre-injection pressure detecting means in the first gap measuring device is provided at an opening of the battery can in which the winding group is accommodated. A first cylinder mounted and in communication with the inside of the battery can, a first piston forming the first reference volume and the second reference volume in the first cylinder; A first pressure gauge for detecting the pressure in the cylinder, wherein the post-injection pressure detecting means in the second gap measuring device includes the battery can in which the winding group is housed. A second cylinder attached to the opening of the battery can and communicating with the inside of the battery can; and a second piston forming the third reference volume and the fourth reference volume in the second cylinder. Detecting the pressure in the second cylinder. And a second pressure gauge for producing the battery. 8. The battery manufacturing apparatus according to claim 6, wherein said first reference volume and said third reference volume are substantially the same, and said second reference volume and said fourth reference volume. Are substantially the same. 9. A method for manufacturing a battery, comprising a battery group having a bottomed cylindrical shape and a winding group sealed together with an electrolyte, wherein a first reference volume and a void amount in the battery are based on a first reference volume and a void amount in the battery. And a second pressure based on a second reference volume and a void amount in the battery, and calculating the internal void amount based on at least the first and second pressures. And calculating an injection amount of the electrolytic solution based on the void amount obtained in the void amount measuring process, and injecting an electrolytic solution corresponding to the calculated injected amount into the battery can. And a method for producing a battery. 10. A method for manufacturing a battery comprising a battery group having a bottomed cylindrical shape and a winding group sealed together with an electrolyte, comprising: a first reference volume and a gap before the electrolyte is injected into the battery. Detecting a first pre-injection pressure based on the volume, a second reference volume and a second pre-injection pressure based on the void volume in the battery before the electrolyte injection, and at least the first and second injections. A first void volume measuring step of calculating the void volume before the injection of the electrolyte based on the pre-pressure, and based on the void volume before the injection of the electrolyte obtained in the first void volume measuring step. Calculating an injection amount of the electrolyte, and injecting an amount of the electrolyte corresponding to the calculated injection amount into the battery can; a third reference volume and an electrolyte injection after the injection of the electrolyte in the battery. First post-injection pressure based on void volume, fourth reference volume, and electrolyte injection into the battery Detecting a second post-injection pressure based on the amount of voids, and calculating a void amount after the injection of the electrolyte based on at least the first and second post-injection pressures, Having a void amount inspection step of determining whether or not the void amount after the injection of the electrolyte obtained in the second void amount measurement step is within a predetermined allowable range to determine the quality of the battery. A method for manufacturing a battery. 11. The method for manufacturing a battery according to claim 9, wherein the first reference volume and the third reference volume are substantially the same, and the second reference volume and the fourth reference volume are provided. Are substantially the same.