JP5371826B2 - Electrolyte injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolyte solution injection device capable of performing a liquid injection process and a preliminary charging process by itself, and shortening processing time. <P>SOLUTION: The electrolyte solution injection device 2 is provided with a jig 3 consisting of terminal parts 31, 32 and a liquid injection part 33 arranged at a given distance from the terminal parts 31, 32, an electrolyte solution supply part 4 supplying electrolyte solution Q to the liquid injection part 33, and a charging part 6 supplying current to the terminal parts 31, 32. The jig 3 has the terminal parts 31, 32 electrically connected with electrode terminals 11a, 11b, as it is installed on the battery container 10 with the electrode terminals 11a, 11b and a hole 12a arranged separated at a given interval, and that, the liquid injection part 33 and the hole 12a maintain a physically connected state. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electrolyte solution injection device in battery manufacture.

  Conventionally, a secondary battery that can be repeatedly charged and discharged has been used as a power source of an electric device. In recent years, secondary batteries with high energy density such as lithium ion secondary batteries have been developed. A general secondary battery includes a battery container that stores an electrolyte solution, an electrode plate that is accommodated in the battery container and contacts the electrolyte solution, and is provided outside the battery container and is electrically connected to the electrode plate. Electrode terminals.

  In order to manufacture a secondary battery, for example, an electrode is accommodated in a battery container provided with a hole for injecting an electrolytic solution, and after injecting the electrolytic solution from the hole, the hole is sealed. As one of apparatuses for injecting an electrolyte into a battery container, there is a liquid injector for a stationary storage battery disclosed in Patent Document 1. This stationary storage battery injector includes an injection container for storing an electrolytic solution, and an injection cylinder communicating with the injection container. When liquid injection is performed, the liquid injection cylinder is inserted into a liquid injection port provided in the battery container. The liquid injection cylinder is provided with a plug body that normally closes the liquid injection cylinder and a plug opening device that contacts the battery lid when the liquid is injected to open the plug body.

Japanese Utility Model Publication No. 2-13849

  By the way, in battery manufacture, after injecting electrolyte solution into a battery container in an injection process, as a preliminary charging process for a secondary battery in the manufacturing process, a process of charging to a state of several percent of full charge is performed. . Here, since the liquid injection process and the preliminary charging process are each performed by separate devices, it is necessary to align the secondary battery and each device in the manufacturing process for each process. Therefore, there has been a problem that the manufacturing work becomes complicated. In addition, as an exhaust gas process following the preliminary charging process, a process of removing the electrochemically generated gas at the time of initial charging or initial discharging is performed, and a highly safe secondary battery is supplied. Since the process is performed by another apparatus, there is a problem that it takes a lot of time to manufacture the battery.

  The present invention has been made in view of the above-described circumstances, and is capable of performing the liquid injection process and the preliminary charging process with one apparatus, and can reduce the processing time. Is one of the purposes. Furthermore, the present invention can perform the exhaust gas process in one apparatus in addition to the liquid injection process and the preliminary charging process, and can further reduce the processing time and efficiently manufacture a highly safe secondary battery. One object is to provide an electrolyte solution injection device that can be used.

In the present invention, the following means are employed in order to achieve the above-mentioned object.
An electrolyte solution injection device according to the present invention includes a jig provided with a terminal part and a liquid injection part arranged at a predetermined distance from the terminal part, an electrolyte supply part that supplies the electrolyte to the liquid injection part, A charging unit that supplies current to the terminal unit, and the jig is placed in a battery container in which the electrode terminal and the hole are spaced apart by the predetermined distance, whereby the terminal unit and the electrode The terminal is electrically connected, and the liquid injection part and the hole are maintained in a physically connected state.

  In this way, when connecting the jig to the battery container, the terminal part is aligned with the electrode terminal and the liquid injection part is aligned with the hole provided in the battery container. Save time and effort. Further, the relative position between the terminal portion and the electrode terminal and the relative position between the physical connection portion and the hole are maintained in a state where the jig and the battery container are installed. Therefore, immediately after the injection of the electrolytic solution, the charging control can be performed on the secondary battery in the manufacturing process by the charging unit. In the above configuration, by providing an intake portion that exhausts air from the liquid injection portion, in addition to the liquid injection step and the preliminary charging step, the exhaust gas step can also be performed with a single device.

  According to the present invention, it is possible to perform the injection of the electrolytic solution into the battery container and the preliminary charging of the injected electrolytic solution with a single device, thereby reducing the labor required for the alignment performed in each step. The manufacturing efficiency of the secondary battery can be increased. Furthermore, in addition to the liquid injection process and the precharge process, the exhaust gas process can be performed with a single device, so that the processing time can be further shortened and a highly safe secondary battery can be efficiently produced. An electrolyte solution injection device that can be manufactured can be provided.

It is a perspective exploded view showing secondary battery 1 which is the 1st example of a secondary battery. It is a schematic diagram which shows the structure of the electrolyte solution injection apparatus 2 of 1st Embodiment. (A) is a top view of the jig | tool 3, (b) is the sectional view on the A-A 'line of (a). It is a flowchart which shows operation | movement of the electrolyte solution injection apparatus 2 of 1st Embodiment. It is a timing chart of operation | movement of the electrolyte solution injection apparatus 2 of 1st Embodiment. It is a perspective exploded view showing secondary battery 1B which is the 2nd example of a secondary battery. It is a schematic diagram which shows the structure of the electrolyte solution injection apparatus 2B of 2nd Embodiment. (A) is a top view of the jig | tool 3B, (b) is the B-B 'sectional view taken on the line of (a). It is a flowchart which shows operation | movement of the electrolyte solution injection apparatus 2B of 2nd Embodiment. It is a timing chart of operation | movement of the electrolyte solution injection apparatus 2B of 2nd Embodiment. It is a flowchart which shows operation | movement of the electrolyte solution injection apparatus of 3rd Embodiment. It is a timing chart of operation | movement of the electrolyte solution injection apparatus of 3rd Embodiment. It is a schematic diagram which shows the structure of 2 C of electrolyte solution injection apparatuses of 4th Embodiment. (A) is a plan view of the jig 3C, and (b) is a cross-sectional view taken along the line C-C 'of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used for explanation, in order to show characteristic parts in an easy-to-understand manner, dimensions and scales of structures in the drawings may be different from actual structures. In the embodiment, the same components are illustrated with the same reference numerals, and detailed description thereof may be omitted. Prior to the description of the electrolytic solution injection device and the method for manufacturing a secondary battery according to the present invention, first, a configuration example of the secondary battery will be described.

FIG. 1 is an exploded perspective view showing a configuration of a secondary battery 1 which is a first example of a secondary battery.
As shown in FIG. 1, the secondary battery 1 includes a battery container 10 that stores an electrolytic solution therein. The secondary battery 1 is, for example, a lithium ion secondary battery. The battery container 10 is an aluminum hollow container, for example. The battery container 10 of this example has a substantially prismatic shape (substantially rectangular parallelepiped shape). The battery container 10 includes a container body 10a that is a three-dimensional structure having an opening, and a lid portion 10b that closes the opening.

  The lid 10b is provided with an electrode terminal 11a, an electrode terminal 11b, an electrolyte injection port 12a, and an exhaust port 12b. For example, the electrode terminal 11a is a positive terminal and the electrode terminal 11b is a negative terminal. An electrode plate 13, an electrode plate 14, and a separator 15 are accommodated inside the battery container 10.

  The electrode plate 13 and the electrode plate 14 are formed by using a sheet-like current collector such as a conductor foil or a conductor thin plate as a base material, and coating the surface of the base material with an electrode active material according to the type of the electrolytic solution. For example, the electrode plate 13 is a positive electrode plate, and the electrode plate 14 is a negative electrode plate. The electrode plate 13 is disposed to face the electrode plate 14. The electrode plate 13 and the electrode plate 14 are repeatedly arranged in directions facing each other.

  A separator 15 is provided between the electrode plate 13 and the electrode plate 14 so that the electrode plate 13 and the electrode plate 14 do not contact each other. As the separator 15, for example, a microporous resin film such as polyethylene or polypropylene is used.

  An electrode tab 13a is formed at the end of the electrode plate 13 on the electrode terminal 11a side. The electrode tabs 13a of the plurality of electrode plates 13 arranged repeatedly are collectively connected to the electrode terminal 11a. An electrode tab 14a is formed at the end of the electrode plate 14 on the electrode terminal 11b side. The electrode tabs 14a of the plurality of electrode plates 14 arranged repeatedly are collectively connected to the electrode terminal 11b.

  Inside the battery container 10, the electrolytic solution contacts with the electrode plate 13 and the electrode plate 14 and is stored so as to fill the pores of the separator 15. For example, examples of the electrolyte solution for a lithium ion secondary battery include a solution in which a lithium salt such as lithium hexafluorophosphate or lithium tetrafluoroborate is dissolved in an organic solvent such as ethylene carbonate or diethyl carbonate.

  Hereinafter, although the electrolyte solution injection device of the present invention will be described, the secondary battery 1 shown in FIG. 1 is an example, and the application range of the present invention is not limited to the type and shape of the secondary battery. For example, the present invention can be applied to other types of secondary batteries such as lead-acid batteries and sodium-sulfur secondary batteries, and can also be applied to prismatic and wound cylindrical secondary batteries. .

[First Embodiment]
FIG. 2 is a schematic diagram showing the configuration of the electrolyte solution injection device 2 of the first embodiment, and FIG. 3A is a plan view showing the detailed configuration of the jig 3 used in the electrolyte solution injection device 2. (b) is the sectional view on the AA 'line of (a).

  As shown in FIGS. 2, 3 (a), and 3 (b), the electrolyte solution injection device 2 includes a jig 3, an electrolyte solution supply unit 4, an intake unit 5, and a charging unit 6. A first pipe 21 and a second pipe 22 are connected to the jig 3. The electrolyte solution supply unit 4 is connected to the jig 3 via the first pipe 21 so that the electrolyte solution can be supplied to the inside of the battery container 10. The intake portion 5 is connected to the jig 3 via the second pipe 22 in order to exhaust the internal gas of the battery container 10. The jig 3 includes a terminal portion 31 and a terminal portion 32. The terminal unit 31 is electrically connected to the charging unit 6 via the wiring 61. The terminal unit 32 is electrically connected to the charging unit 6 through the wiring 62.

  The jig 3 includes a jig body 30 having a recess 30a, a terminal portion 31, a terminal portion 32, a first nozzle (liquid injection portion) 33, a second nozzle (liquid injection portion) 34, and a seal portion 35. ing. The concave portion 30a is shaped to be fitted to an end portion of the battery container 10 where the electrode terminal 11a, the electrode terminal 11b, the liquid injection port 12a, and the exhaust port 12b are provided. Inside the recess 30a, a terminal portion 31, a terminal portion 32, a first nozzle 33, a second nozzle 34, and a seal portion 35 are provided.

  The jig 3 is pressed so that the substantially entire surface of the concave portion 30a including the seal portion 35 is in contact with the end portion of the battery case 10, whereby the concave portion 30a of the jig 3 and the end portion of the battery case 10 are brought into contact. The battery container 10 is connected to the battery case 10. Hereinafter, a state in which the jig 3 is placed and connected to the battery container 10 is referred to as when the jig is connected.

  When the jig is connected, the side wall of the recess 30a including the seal portion 35 is fixed by sandwiching the end of the battery container 10, so that the terminal portion 31 and the terminal portion 32 provided on the jig 3 are respectively connected to the electrode terminal 11a. The first nozzle 33 and the second nozzle 34 are respectively inserted into the liquid injection port 12a and the exhaust port 12b. It is also called a holding part because it has a holding function. For this reason, at the time of jig connection, it will be in the state which can continuously charge the secondary battery of the manufacturing process in which the electrolyte solution injection and the electrolyte solution were injected. Therefore, compared with the case where alignment is performed in the liquid injection process and the preliminary charging process, labor required for alignment can be reduced, and the manufacturing efficiency of the secondary battery can be increased.

  The seal part 35 is made of, for example, a rubber material, and is provided along the inner side wall of the recess 30a. When the jig is connected, the seal portion 35 is in close contact with the side wall of the battery container 10, and the space between the jig 3 and the battery container 10 (inside the recess 30a) is hermetically sealed.

  The electrolyte supply unit 4 includes a storage tank 41, a feed tank 42, a measuring unit 43, a pressurizing unit 45, and a first valve 44. The measuring unit 43, the first valve 44, and the pressurizing unit 45 are connected to a control device (not shown) and controlled by this control device.

  The storage tank 41 is connected to the feed tank 42 via the measuring unit 43. A first pipe 21 is connected to the feed tank 42. The first valve 44 is provided in the first pipe 21.

  The pressurizing unit 45 is connected to the feed tank 42 via a pipe. The pressurizing unit 45 pressurizes the inside of the feed tank 42, whereby the electrolyte Q stored in the feed tank 42 can be supplied to the first nozzle 33.

  The storage tank 41 can store the electrolytic solution Q. The volume of the storage tank 41 is, for example, at least twice the amount of the electrolyte solution Q (hereinafter referred to as a predetermined amount) to be injected into one secondary battery 1.

  The metering unit 43 includes, for example, an electromagnetic valve and a flow meter, and manages the amount of the electrolyte Q flowing from the storage tank 41 into the feed tank 42. The flow meter measures the flow rate of the electrolyte Q flowing from the storage tank 41 to the feed tank 42, and transmits the flow rate data indicating the measured flow rate to the control device. The electromagnetic valve changes the flow rate of the electrolytic solution Q or stops the flow of the electrolytic solution Q into the feed tank 42 based on the command from the control device. Based on the flow rate data received from the flow meter, the above control device controls the electromagnetic valve so that the total flow rate of the electrolyte Q becomes a predetermined amount in a series of liquid injection operations for one secondary battery 1.

  Instead of the flow meter, a weight meter that measures the total weight of the electrolyte Q inside the feed tank 42 and the feed tank 42 may be used. In this case, the control device calculates the amount of the electrolyte Q inside the feed tank 42 from the amount of change in the total weight accompanying the inflow of the electrolyte Q, for example, and a predetermined amount of the electrolyte Q flows into the feed tank 42. To control the electromagnetic valve.

  The pressurizing unit 45 is constituted by a compressor, for example. The pressurizing unit 45 is controlled by the control device described above, and pressurizes the inside of the feed tank 42 by supplying an inert gas such as nitrogen gas to the inside of the feed tank 42. When the inside of the feed tank 42 is pressurized while the electrolytic solution Q is held in the feed tank 42, the electrolytic solution Q inside the feed tank 42 is pushed out to the first pipe 21. The first valve 44 is constituted by, for example, an electromagnetic valve. The first valve 44 is controlled by the control device described above to start or stop the flow of the electrolyte Q to the first nozzle 33.

  The intake part 5 is configured by, for example, a vacuum pump. When the jig is connected, the intake section 5 is controlled by the control device and starts to exhaust. Thereby, the internal gas of the battery container 10 is exhausted through the second pipe 22. The second pipe 22 is provided with a second valve 24. The second valve 24 is constituted by an electromagnetic valve, for example. The second valve 24 is controlled by the control device described above, and starts or stops the exhaust of the internal gas from the battery container 10.

  The charging unit 6 is composed of, for example, a charger, and can apply a desired voltage between the terminal unit 31 and the terminal unit 32 via the wiring 61 and the wiring 62. When the jig is connected, the charging unit 6 is controlled by the control device described above and applies a voltage between the electrode terminal 11a and the electrode terminal 11b. Thereby, charge control is performed with respect to the secondary battery of a manufacture process.

  FIG. 4 is a flowchart showing an operation example of the electrolyte solution injection device 2 of the first embodiment, and FIG. 5 is a timing chart showing an operation example of the electrolyte solution injection device 2 of the first embodiment. Operation | movement of the electrolyte solution injection apparatus 2 is controlled by said control apparatus.

  As shown in FIG. 4, first, in step S <b> 1, the electrode plate 13 and the electrode plate 14 are accommodated inside the battery container 10, and the battery container 10 is temporarily held. Specifically, the lid portion 10b shown in FIG. 1 is provided with electrode terminals 11a and 11b, and a liquid injection port 12a and an exhaust port 12b serving as holes connecting the inside and the outside of the battery container 10. And the laminated body provided with two or more electrode plates 13, the electrode plates 14, and the separator 15 is prepared, the electrode plate 13 is connected with the electrode terminal 11a, and the electrode plate 14 is connected with the electrode terminal 11b. And the said laminated body is accommodated in the container main body 10a, the cover part 10b is attached to the container main body 10a, and the container main body 10a and the cover part 10b are welded by laser welding etc. FIG.

  Next, in step S2, the jig 3 is fitted and connected to the battery case 10 (see FIGS. 3A and 3B). Accordingly, the terminal portion 31 contacts the electrode terminal 11a, the terminal portion 32 contacts the electrode terminal 11b, the first nozzle 33 is inserted into the liquid injection port 12a, and the second nozzle 34 is inserted into the exhaust port 12b. The inserted state is maintained. In the first embodiment, the battery container 10 and the recess 30a are kept airtightly fitted by the seal portion 35. Since the battery container 10 and the jig 3 are hermetically sealed by the seal portion 35, the air bubbles generated in the battery container 10 can be collected through the second nozzle 34 with almost no air bubbles.

  Next, the electrolytic solution supply unit 4 and the intake unit 5 are driven, and steps S3 and steps S4 to S6 are performed substantially in parallel. First, the electrolyte solution Q is measured in step S4, and the amount of the electrolyte solution Q to be injected into the battery container 10 is determined. On the other hand, in step S3, the second valve 24 is opened by the above-described control device, and the intake section 5 is driven to exhaust the battery container 10. Then, steps S5 and S6 are performed almost simultaneously with step S3.

More specifically, as shown in FIG. 5, first performs the above-mentioned control device at time t ₀ in step S4 is the metering of the electrolytic solution Q to turn on the metering unit 43 to the time t _1, the storage tank 41 Karasho A fixed amount of electrolyte Q is allowed to flow into the feed tank 42. Subsequently, in step S3 and step S5, and the ON pressing 45 and the inlet section 5 causes opens the first valve 44 and second valve 24 above control device in time t _2, the battery container The injection of the electrolyte solution Q into the battery 10 and the exhaust of the inside of the battery container 10 are started.

When the pressurizing unit 45 is turned on, the pressure inside the feed tank 42 increases, and the electrolyte Q flowing into the feed tank 42 in step S4 is pushed out to the first pipe 21. The electrolytic solution Q is injected from the first pipe 21 through the first nozzle 33 into the battery container 10. And as predetermined a predetermined amount of the electrolytic solution Q is injected into the battery container 10, Step above control device turns off the first pressurizing portion 45 at time t ₃ closes the valve 44 S5 Exit.

  In the first embodiment, as described above, the pressurizing unit 45 is used for injecting the electrolytic solution Q into the battery container 10. When the electrolyte solution Q is pressurized, the flow rate of the electrolyte solution Q increases, and the time required to inject a predetermined amount of the electrolyte solution Q into the battery container 10 is shortened. Further, not only the electrolyte Q is pushed out toward the inside of the battery container 10, but also the inside of the battery container 10 becomes negative pressure by the intake portion 5, so that the inside of the first pipe 21 and the first nozzle 33. The electrolyte solution Q hardly remains, and an accurate amount of the electrolyte solution Q can be injected into the battery container 10.

Here, between the time t ₄ when the charging and pouring is completed the time t ₃ to the battery container 10 is started, a predetermined time interval is provided. Thereby, for example, charging can be started after a target amount of the electrolyte Q is injected into the battery container 10, and charging is performed during a period in which the electrolyte Q remains inside the first nozzle 33. It is possible to avoid being started.

  In addition, the pressure difference between the inside of the battery container 10 and the outside is reduced by evacuating the inside of the battery container 10 while the battery container 10 is housed in the pressure container or the like, and reducing the pressure inside the pressure container. You can also. In this case, for example, the second pipe 22 may be branched and connected to the pressure vessel, and the inside of the pressure vessel may be decompressed by the intake portion 5. According to this, the battery container 10 can be held in a more sealed state, and gas can be prevented from leaking outside the pressure container or the like.

At STEP S6, to start charging the secondary battery manufacturing process by the charging unit 6 when it becomes a time t _4, and continues this until time t _5. Therefore, from time t ₄ to t ₅ , the second valve 24 remains open and the intake unit 5 and the charging unit 6 remain on. When the charging unit 6 is turned on, a predetermined voltage is applied via the electrolytic solution Q between the electrode plate 13 and the electrode plate 14 shown in FIG. When the charging reaction starts, gas such as bubbles may be generated in the electrolyte Q. One possible cause of the generation of this gas is that some of the organic components contained in the electrode active material and the electrolyte Q are decomposed by the application of power. The gas generated inside the battery case 10 by this charging reaction is exhausted from the exhaust port 12b to the outside of the battery case 10 through the second nozzle 34, the second pipe 22, and the intake portion 5.
Then, turn off the charging unit 6 at time t ₅ before the time t ₆ the step S3 is completed, and ends the step S6.

  In step S6, it is necessary to control charging within the range of the charging rate at which the secondary battery in the manufacturing process is not overcharged. For example, the amount of electricity at which the charging rate of the secondary battery in the manufacturing process including a predetermined amount of electrolyte Q is 10% or more and 100% or less is obtained based on the amount of the electrode active material, etc. The voltage applied by the charging unit 6 may be set so as to be applied to the inside of the battery container 10 containing a predetermined amount of the electrolyte Q within the period of step S6. As the charging rate is increased within the range of the charging rate that does not cause overcharging in step S6, the generation of gas such as bubbles during the second and subsequent charging control, that is, actual use can be reduced.

In the first embodiment, step S3 is such step S6 is terminated at time t ₆ after time t ₅ to end. Thus, even after the charging is completed, the gas generated during charging can be reliably exhausted by continuing the exhaust by the intake section 5 for a while. Therefore, the generation of gas in the charge / discharge cycle during actual use is reduced, and a highly safe secondary battery can be manufactured.

  Subsequently, after step S3 is completed, the jig 3 is removed from the battery container 10 in step S7, and the liquid injection port 12a and the exhaust port 12b are sealed in step S8. Further, the secondary battery 1 can be obtained by performing post-processing such as mounting an insulating cap (not shown) on the battery container 10 as necessary.

  As described above, in the first embodiment, the charging step and the preliminary charging step are performed using the jig 3 including at least the charging terminal portion 31 and the terminal portion 32 and the first nozzle 33 for electrolyte injection. Are continuously performed by one apparatus. Therefore, when the jig 3 is connected to the battery container 10, the terminal portion is aligned with the electrode terminal, and the liquid injection portion is automatically aligned with the liquid injection port, thereby eliminating the labor required for alignment. it can. Further, since the relative position between the terminal portion and the electrode terminal and the relative position between the physical connection portion and the hole are maintained in a state where the jig and the battery container are installed, the charging portion 6 is immediately after the injection of the electrolytic solution Q. The charging control by can be started.

  In the first embodiment, the jig 3 is provided with the second nozzle 34 to exhaust the air by the intake portion 5. Thereby, in addition to the liquid injection process and the preliminary charging process, the exhaust gas process can be performed with one apparatus, and the entire battery manufacturing line can be simplified.

[Second Embodiment]
Next, the electrolyte solution injection device of the second embodiment will be described. FIG. 6 is a perspective exploded view showing a configuration example of the secondary battery in the second embodiment, FIG. 7 is a schematic diagram showing the configuration of the electrolyte solution injection device 2B of the second embodiment, and FIG. 8A is an electrolyte solution. 8B is a plan view of the jig 3B used in the liquid injection device 2B, and FIG. 8B is a cross-sectional view taken along the line BB ′ of FIG.

  The same configurations as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate. In the second embodiment, as in the first embodiment, a control device (not shown) controls each unit, and the description of the control device will be omitted as appropriate.

  One difference between the second embodiment and the first embodiment is that an electrolyte injection port and an exhaust port for exhausting gas generated inside the battery container 10B are used together as one injection port 12B. It is a point. The liquid injection port 12B, the electrode terminal 11a, and the electrode terminal 11b are provided on one surface of the secondary battery 1B (the outer surface of the lid portion 10b).

  Another difference of the second embodiment from the first embodiment is that the seal portion 35 of the first embodiment is arranged at a position where the inner peripheral surface of the jig 3 and the outer peripheral surface of the battery container 10B are fitted. On the other hand, the seal part 34B and the seal part 35B of the second embodiment are arranged on the surface where the jig 3B and the battery container 10B come into contact with each other when the jig is connected. The seal portion 34B is provided so as to surround the nozzle 33B (liquid injection portion) in an annular shape. The seal portion 35B is provided at the peripheral portion of the surface facing the battery case 10B when the jig is connected, and surrounds the region where the terminal portion 31, the terminal portion 32, the nozzle 33B, and the seal portion 34B are arranged in an annular shape. Is provided. Differences from the first embodiment regarding the operation and the like of the electrolyte solution injection device will be described later.

As shown in FIGS. 6 to 8, the nozzle 33B is connected to the first pipe 21B so that both the liquid injection process and the exhaust gas process can be performed by the nozzle 33B of the jig 3B. It branches into 2 piping 22B and 3rd piping 23B. The second pipe 22 </ b> B is connected to the electrolyte solution supply unit 4, and the third pipe 23 </ b> B is connected to the intake unit 5.

  The angle formed by the axis of the second pipe 22B and the axis of the third pipe 23B at the joining portion where the second pipe 22B and the third pipe 23B merge is the same as the angle of the second pipe 22B. The angle is more acute than the angle formed with the axis of the pipe 21B. Specifically, the second pipe 22B is connected to the first pipe 21B in a straight line, and the third pipe 23B is connected to the second pipe 22B at an angle of approximately 90 °.

  A terminal portion 31, a terminal portion 32, a nozzle 33B, a seal portion 34B, and a seal portion 35B are provided on one surface (hereinafter referred to as an installation surface) of the jig body 30B of the jig 3B. In the secondary battery 1B, the jig 3B is placed on the battery container 10B so that the above-described installation surface is aligned with the surface on which the electrode terminal 11a, the electrode terminal 11b, and the liquid injection port 12B are provided. When the jig is connected, the nozzle 33B is inserted into the liquid injection port 12B, the terminal portion 31 is electrically connected to the electrode terminal 11a, and the terminal portion 32 is electrically connected to the electrode terminal 11b. It becomes a state.

FIG. 9 is a flowchart schematically showing the operation of the electrolyte solution injection device 2B of the second embodiment, and FIG. 10 is a timing chart of the operation of the electrolyte solution injection device 2B.
As shown in FIG. 9, in the second embodiment, steps S1 to S9 are performed. In the second embodiment, the exhaust inside the battery container 10B is divided into step S3 before the start of liquid injection and step S7 during charging after the end of liquid injection.

Specifically, to complete the connection of the nozzle 33B to pouring port 12B at the time t ₁₀ to end the step S2 as shown in FIG. 10, followed by starting the step S3. Sunachi, at time t ₁₀ to turn on the air intake unit 5 while opening the second valve 24 to begin the interior of the exhaust of the battery container 10. The exhaust in step S3 is performed so that the electrolyte Q is efficiently injected into the battery container 10B. After continuing the evacuation of the step S3 until the time t _13, and turns off the suction unit 5 while closing the second valve 24, and terminates the step S3.
Also, almost concurrently with step S3, performing weighing of the electrolyte solution Q by measuring unit 43 at step S4 at time _{t 12} from the time _{t 11.}

Then, from time _{t 13} to the time _{t 14,} performs pouring of the electrolyte Q into the battery container 10B as step S5. At time t ₁₄ the pouring of the electrolyte is completed in step S5, it starts inside the exhaust of the battery container 10B as step S7. More specifically, at time t _14, as well as clear the pressure portion 45 while closing the first valve 44, and turns on the air intake unit 5 while opening the second valve 24, the battery container 10B Start internal exhaust. The step S7 to start from the time t ₁₅ where the predetermined time has elapsed until time t _16, performed by the charging unit 6 to charge control of the secondary battery manufacturing process as a step S6. Further, at time _{t 17} after time _{t 16} to end the step S6, it ends the step S7 to turn off the air intake unit 5. The reason why the exhaust in step S7 is performed until the time after the completion of the charging in step S6 is as described in the first embodiment.

  Next, after step S7 is completed, the jig 3B is removed from the battery container 10B in step S8, and the liquid injection port 12B is sealed in step S9. Moreover, the secondary battery 1B is obtained by performing post-processing etc. as needed.

  In the second embodiment as described above, the jig 3B is provided with the nozzle 33B that serves both as the injection of the electrolyte Q and the exhaust of the gas. The electrolytic solution is injected into the battery container 10B through the nozzle 33B connected to the injection port 12B, and then the inside of the battery container 10B is exhausted using the same nozzle 33B. If it does in this way, the number of nozzles can be reduced and the number of parts which constitute electrolyte solution pouring device 2B can be decreased. Further, the processing cost of the exhaust port can be eliminated as compared with the case where an exhaust port or the like is provided separately from the liquid injection port in order to exhaust the inside of the battery container 10B. Thus, since the apparatus cost of electrolyte solution injection apparatus 2B and the processing cost of battery container 10B can be reduced, the manufacturing cost of a secondary battery can be reduced.

  Further, since the seal portion 34B is provided around the nozzle 33B, gas leakage between the outer surface of the nozzle 33B and the liquid injection port 12B can be reduced. Further, in the jig 3B, a seal portion 35B is provided on the installation surface that is in contact with the battery container 10B. Therefore, the airtightness between the battery container 10B and the jig 3B is improved, and the inside of the battery container 10B can be efficiently exhausted while suppressing gas leakage.

  Moreover, in 2nd Embodiment, the angle which the axis | shaft of 2nd piping 22B makes with the axis | shaft of 3rd piping 23B is more acute than the angle which the axis | shaft of 2nd piping 22B makes with the axis | shaft of 1st piping 21B. It has become. Therefore, the electrolyte Q flowing from the second pipe 22B to the first pipe 21B at the junction of the second pipe 22B and the third pipe 23B is transferred from the second pipe 22B to the third pipe 23B. It becomes difficult to wrap around. In order to further reduce the inflow of the electrolyte Q from the second pipe 22B to the third pipe 23B, the third pipe 23B may be configured to extend substantially vertically upward from the first pipe 21B, It is effective to use a configuration in which a valve or the like is provided in a portion where the third pipe 23B is connected to the first pipe 21B.

  Note that a jig provided with a restraining band connected to the jig body 30B may be adopted as the jig 3B. By restraining the battery container 10B with the jig 3B by the restraining band, the function as a holding portion of the jig 3B can be strengthened.

[Third Embodiment]
Next, an electrolyte solution injection device according to a third embodiment will be described. FIG. 11 is a flowchart schematically showing the operation of the electrolyte injection device of the third embodiment, and FIG. 12 is a timing chart of the operation of the electrolyte injection device.

  One difference between the third embodiment and the first embodiment is that the charging unit 6 includes a charger / discharger capable of both charging and discharging. The charging unit 6 can be switched between a charging mode for charging and a discharging mode for discharging by a control device (not shown). In addition, about the same component as 1st Embodiment or 2nd Embodiment, description is abbreviate | omitted suitably.

  As shown in FIG. 11, in 3rd Embodiment, it carries out similarly to 2nd Embodiment from step S1 to step S5. Next, the inside of the battery container 10B is exhausted in step S7 with respect to the battery container 10B into which the electrolytic solution Q has been injected (see FIG. 6), and discharge control is performed by the charger / discharger in steps S6 and S10.

Specifically, as shown in FIG. 12, a discharge starts in step S10 is switched from the charging mode to charger 6 in time t ₁₆ to end the step S6 in the discharge mode, it turns off the charging unit 6 to time t ₁₈ Then, step S10 is finished. For example, after charge control is performed until the charge rate of the secondary battery in the manufacturing process is approximately 100%, discharge control is performed until the charge rate is approximately 20%. At time t ₁₉ after time t _18, and turns off the suction unit 5 while closing the second valve 24, and ends the step S7

  In the third embodiment as described above, the inside of the battery container 10B is exhausted while performing discharge control after charge control, so that both bubbles generated by the charge reaction and bubbles generated by the discharge reaction can be removed. .

  As described in the first embodiment, the higher the charging rate is within a range where overcharging does not occur, the more the generation of bubbles due to the second and subsequent charging control can be significantly reduced. For example, since the secondary battery charged to the upper limit is in a state of high energy density, handling for storing the secondary battery is required unless a separate process such as sealing the secondary battery is performed. Becomes difficult. In 3rd Embodiment, since discharge control is performed after charge control, the charge rate of the manufactured secondary battery can be set to a desired value. In addition, the generation of bubbles during use of the secondary battery can be remarkably reduced, and the secondary battery can be easily stored in a high quality state.

[Fourth Embodiment]
Next, an electrolyte solution injection device according to a fourth embodiment will be described. FIG. 13 is a schematic diagram showing the configuration of the electrolyte solution injection device 2C of the fourth embodiment, FIG. 14 (a) is a plan view of a jig 3C used in the electrolyte solution injection device 2C, and FIG. 14 (b) is FIG. It is CC 'sectional view taken on the line of (a).

  As shown in FIGS. 13, 14 (a), and 14 (b), the jig 3 </ b> C includes a jig body 30 </ b> C, a terminal part 31, a terminal part 32, a first nozzle (liquid injection part) 33 </ b> C, and a seal part. 34C, a seal part 35C, and a third nozzle (exhaust part) 36C. The jig body 30C has a recess 37C that can accommodate the battery container 10B. About the terminal part 31, the terminal part 32, the 1st nozzle 33C, and the seal | sticker part 34C, it is the same as that of 2nd Embodiment, The description is abbreviate | omitted suitably. The seal portion 35C is provided at the peripheral edge portion of the opening of the recess 37C and surrounds the opening in an annular shape. One end side of the third nozzle 36C communicates with the inside of the recess 37C, and the other end side is connected to the fourth pipe 25C.

  The first pipe 21C is connected to the first nozzle 33C. The first pipe 21C is branched into a second pipe 22C and a third pipe 23C. The third nozzle 36C is connected to the third pipe 23C via the fourth pipe 25C. A second valve 24 is provided between a portion where the third piping 23C branches from the first piping 21C and a portion where the fourth piping 25C joins the third piping 23C. The second pipe 22 </ b> C is connected to the electrolytic solution supply unit 4. The third pipe 23C is connected to the intake section 5.

  Note that the flowchart schematically showing the operation of the electrolyte solution injection device 2C of the fourth embodiment and the timing chart of the operation of the electrolyte solution injection device 2C are the same as those of the third embodiment, so the explanation is omitted. Omitted (see FIGS. 11 and 12 as necessary).

  As shown in FIG. 13, the battery container 10B is placed on a mounting table 20C such as a table or a floor having a substantially flat surface when the processing from step S3 to step S10 is performed. When the jig 3C is pressed against the battery container 10B while the battery container 10B is housed inside the concave portion 37C of the jig 3C, the first nozzle 33C of the jig 3C is inserted into the liquid injection port 12B of the battery container 10B. At the same time, the terminal portion 31 of the jig 3C is connected to the electrode terminal 11a, and the terminal portion 32 is connected to the electrode terminal 11b. In this state, the sealed portion 34C is in close contact with the periphery of the liquid injection port 12B, the seal portion 35C is in close contact with the mounting table, and the recessed space 37C between the jig 3C and the mounting table 20C is hermetically sealed. become. That is, the battery container 10B is placed in the sealed space.

  At the time of exhausting in step S3 and step S7, the pressure difference between the inside and the outside of the battery container 10B can be reduced by reducing the pressure of the sealed space by the intake portion 5 through the third nozzle 36C. Thereby, deformation of the battery case 10B due to the pressure difference can be reduced. Further, since the space in which the battery container 10B is disposed is sealed, even if the gas generated in the battery container 10B leaks to the outside of the battery container 10B, the gas can be recovered almost certainly.

  The technical scope of the present invention is not limited to the above embodiments. Various modifications are possible without departing from the gist of the present invention. For example, the electrolyte solution may be injected into a plurality of times, and the inside of the battery container may be exhausted into a plurality of times. For example, a predetermined amount of half of the electrolyte Q is poured into the feed tank 42 and then poured into the battery container 10. Then, the inside of the battery container 10 is exhausted. While exhausting the inside of the battery container 10, a predetermined amount of the remaining half of the electrolyte Q flows into the feed tank 42 to stop the exhaust of the interior of the battery container 10, and the remaining electrolyte Q is removed from the battery. Liquid is poured into the container 10. After injecting the remaining electrolyte solution Q, the charge control may be started. According to this, it is possible to suppress air bubbles from remaining in the battery container 10 and to manufacture a high-quality secondary battery.

Alternatively, the measurement by the measuring unit 43 may be started in parallel with a part of step S7, and a predetermined amount of the electrolyte Q to be injected into the battery container 10 next time may be allowed to flow into the feed tank 42. According to this, the manufacturing time of the secondary battery can be shortened.
Moreover, you may use the apparatus which can perform charge control and discharge control like the charger / discharger demonstrated in 3rd Embodiment as the charging part 6 of 1st Embodiment.

  In the above embodiment, an example in which one jig is used for one electrolytic solution supply unit has been described. However, a configuration in which a plurality of jigs are provided for one electrolytic solution supply unit may be used. For example, a battery container may be attached to each jig, and the electrolytic solution may be poured into a plurality of battery containers at once. For example, in the second embodiment, the feed tank 42, the metering unit 43, the first valve 44, the pressurizing unit, the first pipe 21 and the second pipe 22 are set as one system, and this system is a plurality of jigs. You may provide in each.

  In this case, the storage tank 41 can be shared by a plurality of systems by branching the piping from the storage tank 41 and connecting the branched branch pipes for each system starting from the measuring unit 43. Further, the third pipe 23, the wiring 61, and the wiring 62 are branched, and the branched branch pipes and branch pipes are connected to the respective jigs. The charging unit 6 can be shared.

  The jig is provided with a nozzle (such as a first nozzle or a second nozzle) that is physically connected to the liquid injection port or the exhaust port of the battery container. As long as it can be fulfilled, it is not limited to a nozzle shape, and may be a simple hole. In addition, the said part is called a liquid injection part.

1, 1B ... secondary battery, 2, 2B, 2C ... electrolyte solution injection device,
3, 3B, 3C ... jig, 4 ... electrolyte supply part, 5 ... intake part, 6 ... charging part,
10, 10B ... battery container, 10a ... container body, 10b ... lid,
11a, 11b ... Electrode terminal, 12B ... Injection port (hole), 12a ... Injection port (hole), 12b ... Exhaust port, 13 ... Electrode plate, 13a ... Electrode Tab, 14 ... electrode plate,
14a ... Electrode tab, 15 ... Separator, 20C ... Mounting table,
21, 21B, 21C ... 1st piping, 22, 22B, 22C ... 2nd piping,
23, 23B, 23C ... 3rd piping, 24 ... 2nd valve,
25C ... 4th piping, 30, 30B, 30C ... Jig body, 30a ... Recess,
31, 32 ... terminal part, 33 ... first nozzle (liquid injection part), 33 B ... nozzle (liquid injection part), 33 C ... first nozzle (liquid injection part), 34 ..Second nozzle (liquid injection part),
34B, 34C, 35, 35B, 35C ... seal part,
36C: Third nozzle (exhaust part), 37C: Recess, 41 ... Storage tank, 42 ... Feed tank, 43 ... Metering part, 44 ... First valve, 45 ... Pressure part, 61, 62 ... Wiring, Q ... Electrolyte, S1-S10 ... Step

Claims (4)

A jig comprising a terminal part and a liquid injection part arranged at a predetermined distance from the terminal part;
An electrolytic solution supply unit for supplying an electrolytic solution to the liquid injection unit;
A charging unit for supplying current to the terminal unit;
Have
The jig is placed in a battery container in which an electrode terminal and a hole are spaced apart by the predetermined distance, whereby the terminal portion and the electrode terminal are electrically connected, and the liquid injection portion An electrolytic solution pouring device, characterized in that the state in which the holes are physically connected is maintained. It further has an intake part that exhausts air from the liquid injection part,
The said intake part performs exhaust_gas | exhaustion inside the said battery container to which the said electrolyte solution was supplied by the said electrolyte solution supply part, and the said electric current was supplied by the said charging part. Electrolyte injection device. The liquid injection part is composed of a first liquid injection part and a second liquid injection part,
The said 1st injection part is physically connected to the said electrolyte supply part, and the said 2nd injection part is physically connected to the said intake part. Electrolyte injection device. It further has a mounting table for mounting the battery container,
The jig further includes an exhaust part connected to the intake part,
The jig is airtightly accommodated between the jig and the mounting table in a state where the jig is placed on the battery container, and the jig is removed from the exhaust part during the exhaust by the intake part. The electrolyte solution injection device according to claim 3, wherein the space between the battery container and the battery container is exhausted.

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