JP2010176989A - Method of manufacturing battery, and battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a battery and the battery, capable of restraining short-circuit failure caused by metal foreign substances mixing into a battery container, while securing liquid injection efficiency into the battery container. <P>SOLUTION: The battery manufacturing process S1 for manufacturing a battery 1 includes a housing process S10 of housing an electrode body 10 inside a battery container 20, and a liquid injection process S20 of injecting electrolyte solution from a cathode non-carried part 15 side (a cathode terminal 17 side). In the liquid injection process S20, the electrolyte solution is guided from a liquid injection part 25 of the battery container 20 and injected into the cathode non-carried part 15 side through a guide member 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery manufacturing method and a battery, and more particularly to a technique for injecting an electrolytic solution into a battery container.

In a manufacturing process for manufacturing a secondary battery such as a lithium ion secondary battery or a nickel metal hydride battery, after charging / discharging elements (a positive electrode, a negative electrode, a separator, etc.) are contained in the battery container, an electrolytic solution is injected into the battery container. The process of carrying out is included.
Conventionally, in an electrolyte injection process, a technique has been used in which an electrolyte is injected from an injection hole provided in a battery container, and the injection hole is closed after the injection to make the inside of the container a sealed space. It was.

In such a liquid injection process, in order to improve the liquid injection efficiency and shorten the time of the manufacturing process, and to improve the performance of the secondary battery, the liquid injection is performed in a short time when the electrolytic solution is injected. There is a need for a technique (permeating the charge / discharge element) and a technique for uniformly distributing the electrolytic solution in the charge / discharge element.
For example, in Patent Document 1, an inner surface of a portion facing a liquid injection end surface of a charge / discharge element of a battery container is formed in a curved surface, and a space is formed between the facing portion of the battery container and the liquid injection end surface of the charge / discharge element. And a technique for providing a liquid injection hole in the opposite portion is disclosed. According to this, the electrolytic solution injected from the liquid injection hole stays in the space, and can be efficiently permeated into the inside from the liquid injection end surface of the charge / discharge element by the liquid pressure of the electrolytic solution.

However, in the technique disclosed in Patent Document 1, metal foreign matters remaining in the battery container may be mixed in the charge / discharge element due to the hydraulic pressure of the electrolytic solution. Examples of such metal foreign matter include metal pieces adhering to the inner wall of the battery container, welding spatter generated during welding of the charge / discharge element and the electrode terminal, and the charge / discharge element cannot be cleaned after the electrode terminal welding. It is difficult to completely remove these metallic foreign matters from the battery container.
In particular, as shown in FIG. 14, the gap between the end of the composite material carrying portion of the positive electrode 110 and the separator 130 in the charge / discharge element 100 (on the unsupported portion side of the negative electrode 120 connected to the charge / discharge element 100). (1) If the metal foreign object 140 has a contact with the positive electrode 110 when the metal foreign object 140 is mixed into the gap), the metal foreign object 140 is eluted and the positive electrode 110 and the negative electrode 120 are short-circuited by the eluted metal foreign object 140. (2) When the metal foreign object 140 does not have a contact with the positive electrode 110, it is shipped without being determined as a defective product during the self-discharge inspection. It is disadvantageous in that the metallic foreign object 140 and the positive electrode 110 may have a contact at an arbitrary timing due to vibration applied to the battery after shipment, which may cause the metallic foreign object 140 to precipitate and cause a short circuit failure suddenly. .
In addition, in order to apply the technique described in Patent Document 1 to a general battery, it is also disadvantageous in that it is inferior in versatility because a separate processing is required for the battery container or it is complicated by a sealing process or the like. .

JP 2005-251422 A

  An object of the present invention is to provide a battery manufacturing method and a battery that can suppress short circuit failure due to metal foreign matter mixed in the battery container while ensuring the efficiency of liquid injection into the battery container.

  The method for producing a battery according to claim 1 includes a positive electrode plate having a composite material supporting part on which a composite material containing an active material is supported, a non-composite material supporting part on which the composite material is not supported, and an active material. A positive electrode plate and a negative electrode plate having a negative electrode plate having a mixture unsupported part on which the composite material is not supported, and a positive electrode plate and a negative electrode plate. A charge / discharge element laminated via a separator made of a body, and a battery container that accommodates the charge / discharge element therein, wherein the unsupported portion of the positive electrode plate is connected to the positive electrode plate and the negative electrode plate. The battery is disposed on one side of the laminated portion of the composite material carrying portion, and the unsupported portion of the negative electrode plate is disposed on the other side of the laminated portion of the composite material carrying portion of the positive electrode plate and the negative electrode plate. In the state in which the charge / discharge element is accommodated in the battery container, From mixture material unsupported portion of the electrode plate or negative electrode plate includes a liquid injection step of pouring the electrolyte solution.

  As described in claim 2, in the battery manufacturing method, the unmixed material on the side where the electrolytic solution is injected from the injection port used when the electrolytic solution is injected in the injection step. A guide member that guides to the support portion side is continuously provided in the liquid injection port, and in the liquid injection step, the electrolytic solution is injected from the liquid injection port through the guide member. It is preferable to guide to the uncarried portion side of the composite material.

  According to a third aspect of the present invention, in the battery manufacturing method, it is preferable that the mixture unsupported portion on the side where the electrolytic solution is injected is a mixture unsupported portion of the positive electrode plate.

  According to a fourth aspect of the present invention, the battery manufacturing method includes a step of adhering the positive electrode side end portion of the separator and the unsupported portion of the positive electrode plate before the liquid injection step. Is preferred.

  The battery according to claim 5 includes a positive electrode plate having on its surface a composite material supporting portion on which a composite material containing an active material is supported, and an unsupported portion on which the composite material is not supported, and an active material. A negative electrode plate having on its surface a composite material supporting part on which a composite material is supported and an unsupported part on which the composite material is not supported, the composite material supporting part of the positive electrode plate and the negative electrode plate being made of a porous body Laminating via a separator, the unsupported portion of the positive electrode plate is disposed on one side of the laminated portion of the positive electrode plate and the negative electrode plate, and the unsupported portion of the negative electrode plate A charge / discharge element disposed on the other side of the laminated portion of the composite material carrying part of the positive electrode plate and the negative electrode plate, a battery container containing the charge / discharge element therein, and a surface of the battery container, An injection port used when pouring the electrolyte into the battery container; and the electrolyte Comprises a guide member for guiding the engagement member unsupported portion of the positive electrode plate or negative electrode plate of the charging and discharging elements from the pouring hole.

  As described in claim 6, in the battery, the unsupported portion of the mixture on the side where the electrolytic solution is injected is connected to an electrode terminal provided to protrude outward from the inside of the battery container, The electrolytic solution is preferably guided through the electrode terminal and the guide member.

  According to a seventh aspect of the present invention, in the battery, it is preferable that the mixture unsupported portion on the side where the electrolyte solution is injected is a mixture unsupported portion of the positive electrode plate.

  As described in claim 8, in the battery, it is preferable that a positive electrode side end portion of the separator and an unsupported portion of the positive electrode plate are bonded.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method and battery of a battery which can suppress the short circuit defect by the metal foreign material mixed in a battery container can be provided, ensuring the liquid injection efficiency in a battery container.

It is a schematic cross section which shows a battery. It is a perspective view which shows the charging / discharging element of a battery. It is an enlarged view which shows a part of charging / discharging element of a battery. It is a perspective view which shows a guide member. It is a flow which shows the manufacturing process of a battery. It is a figure which shows an accommodation process. It is a figure which shows an injection process. It is a figure which shows temporary sealing of the liquid injection port. It is a figure which shows a restraint process. It is a figure which shows this sealing process. It is a figure which shows another embodiment of a battery, (a) is a schematic cross section, (b) is a perspective view which shows a guide member. It is a figure which shows the comparative example of a battery. It is a figure which shows the experimental result of the comparative experiment using a comparative example. It is a figure which shows the prior art example of a battery.

Below, with reference to FIGS. 1-4, the battery 1 which is one Embodiment of the battery which concerns on this invention is demonstrated.
As shown in FIG. 1, the battery 1 includes an electrode body 10 that is a charge / discharge element, and a battery container 20 that houses the electrode body 10 therein, and is configured to be chargeable / dischargeable (for example, a lithium ion secondary battery). Battery).

As shown in FIG. 2, the electrode body 10 is a wound body in which a positive electrode plate 11 and a negative electrode plate 12 are stacked via a separator 13 made of a porous body and wound a plurality of times. The positive electrode plate 11 and the negative electrode plate 12 are stacked via a separator 13, and the positive electrode active material or a mixture containing a negative electrode active material is supported on each of the stacked portions 14 of the positive electrode plate 11 and the negative electrode plate 12. ing. In other words, in the electrode body 10, the composite material carrying portion of the positive electrode plate 11 and the composite material carrying portion of the negative electrode plate 12 are laminated via the separator 13, and the chemical reaction between the positive electrode and the negative electrode in the laminated portion 14 is performed. It is the structure which charges / discharges.
The positive electrode plate 11 is obtained by applying a mixture containing a positive electrode active material to a part of the surface of an electron conductive current collector foil (for example, a metal foil such as aluminum). The negative electrode plate 12 is an electron conductive material. A mixture containing a negative electrode active material is applied to a part of the surface of the current collector foil (for example, a metal foil such as copper).

In addition, as shown in FIG. 1, the unsupported portions 15 and 16 on the positive electrode plate 11 and the negative electrode plate 12 on which the composite material is not supported are respectively in opposite directions (in the winding axis direction of the electrode body 10) from the laminated portion 14. Projects in both directions. That is, the positive electrode unsupported portion 15 of the positive electrode plate 11 is disposed on one side of the laminated portion 14, and the negative electrode unsupported portion 16 of the negative electrode plate 12 is disposed on the other side of the laminated portion 14.
In the protruding portion from the laminated portion 14, the positive electrode unsupported portion 15 of the positive electrode plate 11 is connected to the positive electrode terminal 17, and the negative electrode unsupported portion 16 of the negative electrode plate 12 is connected to the negative electrode terminal 18 by welding.
The positive electrode terminal 17 and the negative electrode terminal 18 are electrode terminals serving as connection paths for electrical energy exchange with the outside of the battery 1, and project outward from the battery container 20 (upper side in the drawing).

As shown in FIG. 3, the boundary portion 19 between the separator 13 and the positive electrode unsupported portion 15 (that is, the portion where the positive electrode side end portion of the separator 13 and the negative electrode side end portion of the positive electrode unsupported portion 15 overlap) 19 is adhered to each other. In such a boundary portion, there is no gap between the separator 13 and the positive electrode unsupported portion 15.
The adhesion of the boundary portion 19 between the separator 13 and the positive electrode unsupported portion 15 can be performed using, for example, a modified polyphenylene ether resin when the electrode body 10 is wound. Other thermoplastic resins can be used as appropriate.

As shown in FIG. 1, the battery container 20 is a housing member that houses the electrode body 10, and includes an exterior 21, a lid 22, and the like. In the battery container 20, the electrode body 10 has a winding direction as a direction in which gravity acts (vertical direction in the drawing), and the winding side faces the both sides of the longitudinal direction (left and right direction in the drawing) of the battery container 20. Is contained.
The exterior 21 is a metal box-shaped member that opens on one surface (upper surface in the drawing), and has a square shape. The lid 22 is a metal flat plate member that closes the opening surface of the exterior 21, and has a shape corresponding to the opening surface of the exterior 21. Examples of the material of the exterior 21 and the lid 22 include aluminum.
Holes (not shown) through which the positive electrode terminal 17 and the negative electrode terminal 18 can be penetrated and fixed are provided on both sides of the lid 22, and the positive electrode terminal 17 and the negative electrode terminal 18 are exposed to the outside through the holes. It is protruding. The positive electrode terminal 17 and the negative electrode terminal 18 are arranged with a predetermined gap so as not to contact the inner wall of the exterior 21, and a space is formed between the inner wall on both sides of the exterior 21 and the electrode body 10. .

As shown in FIG. 1, a liquid injection port 25 that opens in the thickness direction (vertical direction in the drawing) of the lid body 22 is formed on the positive terminal 17 side of the lid body 22. A guide member 26 for guiding the electrolytic solution to a predetermined location is attached to the inside of the exterior 21 of the liquid injection port 25. The electrolyte injected from the injection port 25 is introduced into the internal space of the battery container 20 by the guide member 26 (more precisely, the space formed by the inner wall of the exterior 21 on the positive electrode terminal 17 side and the electrode body 10). Guided.
The guide member 26 is a resin member, and is fixed and supported by the positive electrode terminal 17.

As shown in FIG. 4, the guide member 26 includes a guide portion 28 that guides the electrolytic solution to the positive electrode terminal 17 side (the positive electrode unsupported portion 15 side of the positive electrode plate 11), and a fixing portion 29 that is fixed to the positive electrode terminal 17. It consists of.
The guide portion 28 is a portion having a substantially rectangular parallelepiped shape in which two surfaces (the upper surface and the side surface on the fixed portion 29 side in the drawing) are opened, and one surface (upper surface) of the two opening surfaces faces the other surface (side surface). Guide the electrolyte.
The fixing portion 29 is a plate-like portion provided to protrude laterally from the opening portion on the side surface side of the guide portion 28. The fixing portion 29 has a fixing hole 29a penetrating in the extending direction of the positive electrode terminal 17 (vertical direction in the drawing). The fixing hole 29a is formed in a shape corresponding to the outer peripheral portion of the positive electrode terminal 17, and the positive electrode terminal 17 penetrates and is welded to the fixing hole 29a. Thereby, the guide member 26 is fixed and supported by the positive electrode terminal 17.
In this case, by forming the guide member 26 of resin, the generation of metal foreign objects when welding and fixing to the positive electrode terminal 17 is suppressed. Further, by making the guide member 26 made of resin, the degree of freedom of molding such as injection molding can be improved, and versatility for various batteries having a manufacturing process of injecting an electrolytic solution or the like can be secured. Note that the resin material of the guide member 26 has sufficient electrolytic solution resistance and gas resistance.

As described above, the battery 1 includes the guide member 26 that guides from the liquid injection port 25 to the internal space on the positive electrode unsupported portion 15 side (positive electrode terminal 17 side) inside the battery container 20.
Thereby, by guiding the electrolytic solution to the wound side surface (injection end surface) side of the electrode body 10, the injection efficiency can be improved, and metal foreign matter mixed in the battery container 20 is injected from the injection port 25. Due to the liquid pressure of the electrolytic solution to be liquefied, it is possible to suppress a problem of being mixed from the negative electrode unsupported portion 16 side (negative electrode terminal 18 side) into the gap between the composite material supporting portion of the positive electrode plate 11 and the separator 13.
Therefore, after manufacturing the battery 1 while ensuring the efficiency of injecting the electrolyte, the composite material holding portion of the positive electrode plate 11 and the metal foreign object suddenly have a contact by virtue of applying vibration from the outside of the battery 1, and the metal Short-circuit failure inside the electrode body 10 due to the precipitation of foreign matters can be suppressed.
Further, in the battery 1, since the electrolytic solution is guided from the injection port 25 to the internal space of the battery container 20 through the guide member 26 and the positive electrode terminal 17 continuously arranged from the guide member 26, the battery 1 is efficient. In addition, it is possible to realize a proper liquid injection and to promote the penetration of the electrolytic solution into the electrode body 10 through the positive electrode terminal 17 connected to the positive electrode unsupported portion 15 constituting a part of the electrode body 10. Further, since the internal space of the battery container 20 through which the electrolytic solution is guided faces the wound side surface of the electrode body 10, the contact area with the electrode body 10 is increased, that is, the penetration efficiency into the electrode body 10 is improved. it can.

Furthermore, in the battery 1, since the boundary portion between the positive electrode unsupported portion 15 and the separator 13 is bonded, no metal foreign matter is mixed into the gap between the positive electrode unsupported portion 15 and the separator 13.
Thereby, when injecting electrolyte from the injection hole 25, it can prevent reliably that a metal foreign material mixes into the clearance gap between the composite material support part of the positive electrode plate 11, and the separator 13 from the positive electrode unsupported part 15 side. .
Accordingly, even when the battery 1 is manufactured, a short circuit failure inside the electrode body 10 due to the metal foreign matter having a contact point on the mixture carrying portion of the positive electrode plate 11 and the metal foreign matter being deposited can be suppressed.

Below, with reference to FIGS. 5-10, battery manufacturing process S1 which manufactures the battery 1 is demonstrated.
As shown in FIG. 5, the battery manufacturing process S1 includes a housing process S10, a liquid injection process S20, a restraining process S30, an initial charging process S40, a main sealing process S50, a high temperature aging process S60, an inspection process S70, and the like.

The housing step S <b> 10 is a step of housing the electrode body 10 in the battery container 20 and closing the opening of the battery container 20.
As shown in FIG. 6, in the accommodating step S <b> 10, the positive electrode terminal 17, the negative electrode terminal 18, and the guide member 26 are fixed to the lid body 22, and the electrode body 10 is connected and fixed to the positive electrode terminal 17 and the negative electrode terminal 18. These are integrally accommodated in the exterior 21, and the electrode body 10 is accommodated in the battery container 20 by joining the opening surface of the exterior 21 and the lid body 22 by laser welding or the like. At this time, the battery container 20 is sealed by the lid 22, and the inside of the battery container 20 is sealed except for the liquid injection port 25 provided in the lid 22.
In the present embodiment, the electrode body 10 as a wound body is prepared before the accommodating step S10, and the boundary portion 19 between the positive electrode unsupported portion 15 and the separator 13 is bonded at that time. (See FIG. 3).

The liquid injection step S20 is a step of injecting an electrolytic solution into the battery container 20 sealed in the housing step S10. Examples of the electrolyte include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and vinylene carbonate (VC), and chains such as dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC). A solution in which a supporting electrolyte such as LiPF6, LiClO4, LiBF4, or the like is dissolved in an organic solvent mixed with the carbonated carbonate can be used.
As shown in FIG. 7, in the liquid injection step S <b> 20, the electrolytic solution is filled into the battery container 20 from the liquid injection port 25 through the guide member 26. More specifically, the electrolytic solution injected from the injection port 25 is temporarily stored in the guide portion 28 (see FIG. 4) of the guide member 26, and then the opening portion on the side surface side of the guide portion 28. To the positive terminal 17 side, and accumulates in the internal space of the exterior 21 along the positive terminal 17. Then, the electrolytic solution stored in the internal space on the positive electrode terminal 17 side of the outer casing 21 penetrates into the electrode body 10 through the gap on the wound side surface (injection end surface) of the electrode body 10 on the positive electrode terminal 17 side.
That is, the electrolytic solution is guided in the order of the injection port 25 → the guide member 26 → the positive electrode terminal 17, stored in the internal space of the exterior 21, and permeates the electrode body 10.
At this time, since the injection end surface of the electrolyte solution into the electrode body 10 is a wound side surface on the positive electrode terminal 17 side, the metal foreign matter mixed in the battery container 20 is injected from the injection port 25. With this hydraulic pressure, it is possible to suppress the problem of mixing into the gap between the composite material supporting portion of the positive electrode plate 11 and the separator 13 from the negative electrode unsupported portion 16 side (negative electrode terminal 18 side).
Further, since there is no gap at the boundary portion between the separator 13 and the positive electrode unsupported portion 15, when the electrolyte penetrates into the gap on the winding side surface of the electrode body 10 from the positive electrode unsupported portion 15 side, the separator 13 and the positive electrode Metal foreign matter (for example, spatter generated when the terminals 17 and 18 are welded to the unsupported portions 15 and 16) does not enter between the mixed material carrying portion of the plate 11 and the metal foreign matter and the positive electrode (positive plate 11). The metal foreign matter can be prevented from being precipitated due to contact with the composite material carrying part.
As shown in FIG. 8, after a predetermined amount of electrolyte is injected into the battery container 20, the injection port 25 is temporarily sealed with a rubber plug 30. As the rubber plug 30, ethylene-propylene copolymer (EPDM), chloropyrene rubber, butyl rubber, silicon rubber, fluorine-based rubber, or the like can be used. In addition, any material can be used as long as it has an electrolytic solution resistance and a gas resistance and has a property of being in close contact with the lid 22.
In addition, liquid injection process S20 is performed in a dew point-30 degreeC environment.

The restraining step S30 is a step of restraining the battery 1 after injecting the electrolyte in the pouring step S20 and stabilizing the initial performance of the battery 1.
As shown in FIG. 9, in the restraint step S30, the restraint member 31 that restrains the wide surface of the battery 1 from both sides is restrained at a restraint pressure of 0.8 MPa. The restraining member 31 can restrain the battery 1 with a desired restraining pressure and can measure the actual restraining pressure.
When the restraining pressure by the restraining member 31 is too low, the restraining force does not reach the electrode body 10 sufficiently, and voltage variation occurs in the electrode body 10. For this reason, it is desirable that the restraint pressure is 0.2 MPa or more.
Moreover, when the said restraint pressure is too high, a malfunction may arise in the joint surface of the exterior 21 and the cover body 22. FIG. Furthermore, when the member in the electrode body 10 is constrained beyond the strength of a porous body having ion permeability and electro-electrical insulation, the voltage retention in a closed circuit state is lost. For this reason, it is desirable to set the upper limit of the restraint pressure in consideration of the bonding strength between the outer casing 21 and the lid body 22 and the strength of the porous body.

The initial charging step S40 is a step of performing initial charging on the battery 1 conditioned by the restraining step S30.
In the initial charging step S40, electrodes are connected to the positive terminal 17 and the negative terminal 18 while the battery 1 is restrained by the restraining member 31, and the battery 1 is initially charged. At this time, as lithium ions are inserted on the negative electrode side, the electrode body 10 expands, the voltage of the battery 1 increases, and the restraint pressure increases. The initial charging step S40 is terminated according to the restraining pressure.
More specifically, when measuring the voltage in the battery 1, it is preferable that the measurement be within the voltage at which the electrolytic solution is decomposed and close to the voltage that becomes the final chemical reaction peak between the positive electrode and the negative electrode.

The main sealing step S50 is a step in which the gas generated in the battery 1 initially charged in the initial charging step S40 is removed and the liquid injection port 25 temporarily sealed in the liquid injection step S20 is main sealed. is there.
As shown in FIG. 10, in the main sealing step S <b> 50, in a state where the battery 1 is restrained by the restraining member 31, the rubber plug 30 is removed from the liquid filling port 25, and the metal plate material 32 is completely removed from the liquid filling port 25. Then, the plate member 32 and the lid body 22 are welded by laser welding or the like and finally sealed. These steps are performed in an environment with a dew point of −30 ° C.
After the main sealing by the plate material 32, the restraint by the restraining member 31 is once released, the leakage inspection of the battery 1 is performed, and the process proceeds to the lower process while restrained by the restraining member 31 again.

The high temperature aging step S60 is a step of aging the battery 1 that has been sealed in the main sealing step S50 at a high temperature. More specifically, the battery 1 is aged in an environment of 50 ° C. for 15 hours.
The inspection step S70 is a step of performing a self-discharge inspection on the battery 1 that has been subjected to high temperature aging in the high temperature aging step S60. More specifically, the battery 1 is self-discharged at room temperature (25 ° C.) for 10 days.

  The battery 1 is manufactured through the battery manufacturing process S1 described above, and is appropriately shipped as a product.

  Although the battery 1 according to the present embodiment is a secondary battery in which the winding direction of the electrode body 10 is the direction in which gravity acts and the terminal connection portion is a side, the present invention is not limited to this, for example, as shown in FIG. Thus, the battery 2 may be a vertical battery 2 in which the winding direction of the electrode body 10 is orthogonal to the direction in which gravity acts, that is, a battery having a different accommodation form of the electrode body 10, and the battery container is substantially sealed. Thus, any battery may be used as long as it has a manufacturing form in which an electrolytic solution is injected from a predetermined injection port.

As shown in FIG. 11, a battery 2 according to another embodiment includes an electrode body 40 that is a charge / discharge element, and a battery container 50 that houses the electrode body 40 therein, and is configured to be chargeable / dischargeable. It is an ion secondary battery.
The electrode body 40 is a wound electrode body having substantially the same configuration as the electrode body 10 of the battery 1.
The battery container 50 includes an exterior 51, a lid 52, and the like. Within the battery case 50, the electrode body 40 is accommodated such that the winding direction is a direction perpendicular to the direction in which gravity acts (the left-right direction in the drawing), and the winding side faces the bottom and top surfaces of the battery case 50. Has been.
The exterior 51 is a metal box-shaped member that opens on one surface (the upper surface in the drawing), and has a square shape. The lid 52 is a metal flat plate member that closes the opening surface of the exterior 51, and has a shape corresponding to the opening surface of the exterior 51. Examples of the material of the exterior 51 and the lid 52 include aluminum.
The exterior 51 and the lid 52 are fixed while being insulated by an insulating sealing resin 53.

  As shown in FIG. 11A, the electrode body 40 has a positive electrode unsupported portion 45 disposed on the opening surface side of the battery container 50 (exterior 51) and a negative electrode unsupported portion 46 disposed on the bottom surface side. The negative electrode unsupported portion 46 and the bottom surface of the exterior 51 are joined by welding. A positive electrode terminal 47 is connected to the positive electrode unsupported portion 45 by laser welding or the like. The positive electrode terminal 47 penetrates the lid body 52 and protrudes to the outside of the battery container 50.

As shown in FIG. 11, the lid 52 is formed with a liquid injection port 55 that opens in the thickness direction of the lid 52 (the vertical direction in the drawing). A guide member 56 for guiding the electrolytic solution to a predetermined location is attached to the inside of the exterior 51 of the liquid injection port 55. The electrolyte injected from the liquid injection port 55 is introduced into the internal space of the battery container 50 by the guide member 56 (more precisely, the space formed by the inner wall of the exterior 51 on the positive electrode terminal 47 side and the electrode body 40). Guided.
The guide member 56 is a member made of resin like the guide member 26, and is fixed and supported by the positive electrode terminal 47.

As shown in FIG. 11B, the guide member 56 has an outer shape corresponding to the internal shape of the exterior 51 and is disposed substantially parallel to the lid body 52.
The guide member 56 has an opening 57 directly below the liquid injection port 55. The electrolytic solution is guided to the electrode body 40 side through the opening 57. In addition, the guide member 56 has a fixing hole 58 that penetrates in the center portion in the thickness direction of the guide member 56 (vertical direction in the drawing). The fixing hole 58 is formed in a shape corresponding to the outer peripheral portion of the positive electrode terminal 47, and the positive electrode terminal 47 penetrates into the fixing hole 58 and is welded. Thereby, the guide member 56 is fixed and supported by the positive electrode terminal 47.

The battery 2 configured as described above includes a guide member 56 that guides from the liquid injection port 55 to the internal space on the positive electrode terminal 47 side in the battery container 50.
As a result, as in the case of the battery 1, the electrolyte solution is guided to the wound side surface (injection end surface) side of the electrode body 40 by the guide member 56, whereby the injection efficiency can be improved, and the battery container 50 can be A problem that metal foreign matter is mixed into the gap between the negative electrode unsupported portion 46 side (negative electrode terminal side) and the mixture supporting portion of the positive electrode plate and the separator due to the liquid pressure of the electrolyte injected from the injection port 55. Can be suppressed.
As described above, the same effect as that of the battery 1 can be obtained for the battery 2 in which the battery 1 and the electrode body 10 are accommodated differently.
In addition, since the winding direction of the electrode body 40 is accommodated in the battery container 50 as a direction orthogonal to the direction in which gravity acts, the liquid injection end surface (winding side surface) is the gravity direction. For this reason, in this embodiment, it is not necessary to consider the injection efficiency of the electrolytic solution, and the electrolytic solution is guided in the order of the injection port 55 → the guide member 56 → the electrode body 40, so that the positive electrode terminal 47 is not interposed. To the positive electrode unsupported portion 45 of the electrode body 40.

Below, with reference to FIG.12 and FIG.13, the effect show | played by this invention is demonstrated based on the experimental result which conducted the comparative experiment using the comparative example.
As illustrated in FIG. 12, the battery 3 according to the comparative example has a configuration in which the liquid injection port 25 and the guide member 26 are provided on the negative electrode terminal 18 side in the battery 1. That is, the electrolyte solution injection in the battery 3 is performed from the negative electrode terminal 18 side.
The battery 3 can be manufactured by the same manufacturing method as the battery 1.

The experimental results of the comparative experiment between the battery 1 and the battery 3 shown in FIG. 13 are obtained through the following procedures (1) to (3).
(1) Two batteries 1 and 3 are prepared in a state where the electrode body 10 is housed in the battery container 20, respectively.
(2) As a metal foreign matter, an electrolytic solution is poured into the batteries 1 and 3 in a state where 20 copper foreign matters are mixed on the positive electrode side and the negative electrode side, respectively.
(3) After electrolyte injection, the batteries 1 and 3 were disassembled respectively, and (a) the number of copper foreign matter adhering to the end surface of the negative electrode plate 12 on the side of the positive electrode terminal 17 (end surface of the composite material carrying portion of the negative electrode plate 12) b) number of copper foreign matter mixed between the composite material carrying part of the negative electrode plate 12 and the separator 13; (c) on the end face of the positive electrode plate 11 on the negative electrode terminal 18 side (end face of the composite material carrying part of the positive electrode plate 11). The number of adhering copper foreign matters, (d) the number of copper foreign matters mixed between the composite material carrying part of the positive electrode plate 11 and the separator 13 are counted.

As shown in FIG. 13, in the battery 1, there was no copper foreign matter adhering to the end face of the positive electrode plate 11 on the negative electrode terminal 18 side (0/20), but in the battery 3 according to the comparative example, the negative electrode terminal 18. Copper foreign matter adhered to the end face of the positive electrode plate 11 on the side was present (4/20 pieces). In addition, in the battery 1, there was no copper foreign matter mixed between the composite material carrying portion of the positive electrode plate 11 and the separator 13 (0/20), but in the battery 3 according to the comparative example, the positive electrode plate There were copper foreign matters mixed between the 11 composite material carrying portions and the separator 13 (1/20).
These are because in the battery 3, the copper foreign matter 80 was mixed in the electrode body 10 (particularly, the end face of the positive electrode plate 11 on the negative electrode terminal 18 side) due to the liquid pressure of the electrolyte injected from the negative electrode terminal 18 side. . On the other hand, in the battery 1 in which the electrolytic solution is injected from the positive electrode terminal 17 side, there is no adhesion of copper foreign matter to the end portion of the composite material carrying portion of the positive electrode plate 11 on the negative electrode terminal 18 side.

Further, in the battery 3, the copper foreign matter adheres to the end face of the positive electrode plate 11 on the negative electrode terminal 18 side, so that the copper foreign matter is deposited during the self-discharge inspection after the injection, and the pores of the separator 13 are grown due to the growth of the precipitate. A short circuit failure in which the positive electrode plate 11 and the negative electrode plate 12 are short-circuited through the portion may occur.
However, even in the battery 3 configured to be injected from the negative electrode terminal 18 side, there is an effect that it is possible to suppress the mixing of metal foreign substances adhering to the inner wall of the battery container 20.
That is, since the battery 3 includes the guide member 26 that guides from the liquid injection port 25 to the internal space on the negative electrode unsupported portion 16 side (negative electrode terminal 18 side), the battery 3 adheres to the inner wall of the battery container 20. It is possible to reduce the possibility that the metallic foreign matter is contained in the injected electrolyte.
Further, since the electrolytic solution is guided from the liquid injection port 25 to the internal space of the battery container 20 through the guide member 26 and the negative electrode terminal 18 continuously disposed from the guide member 26, the efficient liquid injection is performed. While being realizable, the penetration of the electrolyte into the electrode body 10 can be promoted via the negative electrode terminal 18 connected to the negative electrode unsupported portion 16 constituting a part of the electrode body 10. Further, since the internal space of the battery container 20 through which the electrolytic solution is guided faces the wound side surface of the electrode body 10, the contact area with the electrode body 10 is increased, that is, the penetration efficiency into the electrode body 10 is improved. it can.
Thus, like the battery 3, the electrolytic solution may be injected from the negative electrode terminal 18 side (negative electrode unsupported portion 16 side), and the possibility of contamination of metal foreign matter into the electrode body 10 can be reduced.

As described above, in the battery 1, by pouring the electrolyte from the positive electrode terminal 17 side, the direction in which the electrolyte pressure in the battery container 20 is applied is one direction from the positive electrode terminal 17 side to the negative electrode terminal 18 side. Therefore, it is possible to prevent the metallic foreign matter mixed in the battery container 20 from adhering to the composite material carrying portion of the positive electrode plate 11 on the negative electrode terminal 18 side.
Thus, when the battery 1 and the battery 3 are compared, the battery 1 that injects the electrolyte from the positive electrode terminal 17 side (positive electrode unsupported portion 15 side) like the battery 1 is more effective.

1, 2 Battery 10, 40 Electrode body (charge / discharge element)
DESCRIPTION OF SYMBOLS 11 Positive electrode plate 12 Negative electrode plate 13 Separator 15, 45 Positive electrode unsupported part (Corporate unsupported part of positive electrode plate)
17, 47 Positive electrode terminal 20, 50 Battery container 25, 55 Injection port 26, 56 Guide member

Claims (8)

A positive electrode plate having, on the surface thereof, a composite material supporting portion on which a composite material containing an active material is supported, and a composite material unsupported portion on which the composite material is not supported, and
Including a negative electrode plate having, on the surface thereof, a composite material supporting portion on which a composite material containing an active material is supported, and a composite material unsupported portion on which the composite material is not supported,
A charge / discharge element formed by laminating a composite material supporting part of the positive electrode plate and the negative electrode plate via a separator made of a porous body;
A battery container containing the charge / discharge element therein,
The unsupported portion of the positive electrode plate is disposed on one side of the laminated portion of the mixed material support portion of the positive electrode plate and the negative electrode plate, and the unsupported portion of the negative electrode plate is disposed on the positive electrode plate and the negative electrode plate. A method of manufacturing a battery disposed on the other side of the laminated portion of the composite material carrying part,
A battery manufacturing method including a liquid injection step of injecting an electrolytic solution from the unsupported portion side of the positive electrode plate or the negative electrode plate in a state where the charge / discharge element is accommodated in the battery container. A guide member that guides from the injection port used when injecting the electrolyte solution in the injection step to the unsupported portion side of the mixture on the side where the electrolyte solution is injected is continuously provided to the injection port. Provided in
In the liquid injection step,
The battery manufacturing method according to claim 1, wherein the electrolytic solution is guided from the liquid injection port through the guide member to a mixture unsupported portion side on which the electrolytic solution is injected.   The method for manufacturing a battery according to claim 1, wherein the unsupported portion of the mixture on the side where the electrolyte is injected is an unsupported portion of the positive electrode plate. Before the liquid injection step,
The method for manufacturing a battery according to claim 3, comprising a step of bonding a positive electrode side end portion of the separator and an unsupported portion of the positive electrode plate. A positive electrode plate having, on the surface thereof, a composite material supporting portion on which a composite material containing an active material is supported, and a composite material unsupported portion on which the composite material is not supported, and
Including a negative electrode plate having, on the surface thereof, a composite material supporting portion on which a composite material containing an active material is supported, and a composite material unsupported portion on which the composite material is not supported,
Laminating the material carrying part of the positive electrode plate and the negative electrode plate through a separator made of a porous body,
The unsupported portion of the positive electrode plate is disposed on one side of the laminated portion of the mixed material support portion of the positive electrode plate and the negative electrode plate, and the unsupported portion of the negative electrode plate is disposed on the positive electrode plate and the negative electrode plate. A charge / discharge element arranged on the other side of the laminated portion of the composite material carrying part,
A battery container containing the charge / discharge element therein;
A liquid injection port provided on the surface of the battery container and used for injecting an electrolyte into the battery container;
A battery comprising: a guide member that guides the electrolytic solution from the liquid injection port to the unsupported portion side of the positive electrode plate or the negative electrode plate of the charge / discharge element. The mixture unsupported portion on the side where the electrolytic solution is injected is connected to an electrode terminal provided to protrude outward from the inside of the battery container,
The battery according to claim 5, wherein the electrolytic solution is guided through the electrode terminal and the guide member.   The battery according to claim 5 or 6, wherein the mixture unsupported portion on the side where the electrolytic solution is injected is a mixture unsupported portion of the positive electrode plate.   The battery according to claim 7, wherein a positive electrode side end portion of the separator is bonded to an unsupported portion of the positive electrode plate.

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