JPH10275629A - Battery manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte secondary battery in which a power generation element 1 is integrated to facilitate manufacture and to be housed in a flexible aluminum laminate sheet 2. SOLUTION: An electrode arranging step of arranging a positive electrode 11 and a negative electrode 12 to which a separator 13 is fixed in a fan shape, an adhesive applying step of applying an adhesive A to these opposing surfaces 11a, 13a, and closing the fan shape These opposing surfaces 11a, 13
and an electrode bonding step of bonding the power generating elements to each other to integrate the power generating elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a battery in which a power generating element is formed by alternately disposing positive and negative electrodes having a separator fixed to one or both sides thereof.

[0002]

2. Description of the Related Art In general, a battery (which is an active material holding type chemical battery and includes a primary battery and a secondary battery) forms a power generating element by arranging positive and negative electrodes close to each other with a separator interposed therebetween. The separator is an insulator for separating these positive and negative electrodes, and a separator that can be impregnated with an electrolytic solution is used. For example, in a wound cylindrical battery, a power generating element is formed by winding one strip-shaped positive and negative electrode via two strip-shaped separators, and the power generating element is formed into a cylindrical battery container. To be stored. In addition, a stacked prismatic battery forms a power generating element by laminating a plurality of thin plate-like positive and negative electrodes via a plurality of sheet-shaped separators, and forms the power generating element into a rectangular battery container. To be stored.

[0003]

However, in the conventional method of manufacturing a battery, since the electrode and the separator are wound or laminated in a state of being simply overlapped, the electrode and the separator are not closely adhered to each other without being in close contact with each other. In order to prevent the distance between the electrodes from changing due to floating, or to prevent the overlapping of these electrodes and separators from occurring, the power generation element is made of a metal can, etc. The battery must be housed in a robust battery container and pressed, which not only complicates operations such as tape fixing, but also causes a problem that a thick, heavy and expensive battery container must be used.

The present invention has been made in view of the above circumstances, and further includes a positive electrode and a negative electrode having a separator fixed to one or both of them, thereby facilitating the production of the power generating element and providing a flexible structure. It is an object of the present invention to provide a battery that can be housed in a sheet-shaped battery container or the like.

[0005]

That is, in order to solve the above-mentioned problems, the present invention provides at least one of positive electrodes and negative electrodes having a separator fixed to one or both of them alternately. In a method of manufacturing a battery in which a power generating element is formed by disposing them in close proximity via a separator fixed to an electrode, the separator fixed to at least one of the positive and negative electrodes is alternately arranged one by one or more. An electrode arranging step of arranging the electrodes with a gap therebetween, and applying an adhesive to an opposing surface of one or both of the positive and negative electrodes or an opposing surface of the separator fixed to the electrodes. And an adhesive application step, and the opposing surfaces of the positive and negative electrodes arranged at an interval or the opposing surfaces of the separator fixed to this electrode are brought into close contact and adhered to each other to generate a power generating element. Characterized by comprising an electrode bonding forming.

According to the means, since the positive and negative electrodes are fixed by bonding via the separator fixed to one or both electrodes, the power generating element can be integrated. Therefore, even if this power generating element is not fixed with tape or the like or stored in a battery can or the like and pressed, the distance between the electrodes is not changed, and the overlapping of the electrodes and the separator is not degraded and the battery characteristics are not deteriorated. In addition, the production of the power generation element is facilitated, and the material and shape of the battery container are not limited. In addition, since the adhesive can be efficiently applied to the positive and negative electrodes and adhered to and adhered to each other, the productivity can be improved.

[0007] The electrode to which the separator is fixed is applied, for example, by sequentially applying an adhesive to the long electrode and the separator, and pressing them by a roll press to continuously adhere them.
By punching and forming this for each predetermined shape, it is possible to efficiently manufacture all at once.

Further, in the above-mentioned electrode disposing step, the distance between the positive and negative electrodes is arranged such that one end of the opposing surface is wider than the other end.

According to the means, since the interval between the positive and negative electrodes is widened at one end, the adhesive can be easily applied by spraying the adhesive from the one end.

Further, the above-mentioned adhesive application step includes
The method is characterized by an adhesive sheet inserting step of inserting a double-sided adhesive sheet between opposing surfaces of positive and negative electrodes arranged at intervals or an opposing surface of a separator fixed to this electrode.

According to the means, the positive and negative electrodes can be formed by inserting a double-sided adhesive sheet made of a sheet-like adhesive or a double-sided adhesive sheet having an adhesive layer formed on both sides of the sheet instead of applying the adhesive. Can be glued.

Further, the method is characterized in that a power generating element storing step of storing the power generating element formed in the above-mentioned electrode bonding step in a sheet-like battery container having a barrier property is provided.

According to the means, since the power generating element is integrated, even if the power generating element is housed in a flexible sheet-shaped battery case, the distance between the electrodes changes and the overlap of the electrodes and the separator is shifted. Such a possibility is eliminated, and the battery container can be made thin, lightweight, and inexpensive.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a manufacturing process of a power generating element of a non-aqueous electrolyte secondary battery, and FIG. FIG. 2 is a longitudinal sectional view showing a structure of a power generating element of a secondary battery, FIG. 2 is a longitudinal sectional view showing a structure of an integrated power generating element, and FIG. 4 is a perspective view of a non-aqueous electrolyte secondary battery in which the power generating element is sealed with an aluminum laminate sheet. It is.

In this embodiment, a method of manufacturing a non-aqueous electrolyte secondary battery in which a laminated power generating element 1 is covered with an aluminum laminate sheet 2 and sealed as shown in FIG. 4 will be described.
As shown in FIG. 2, the power generating element 1 includes a plurality of positive electrodes 11, a plurality of negative electrodes 12, and separators 13. Positive electrode 1
Reference numeral 1 denotes a rectangular thin plate formed by coating a positive electrode active material such as a lithium cobalt composite oxide on a positive electrode current collector plate. The negative electrode 12
It has a rectangular thin plate shape in which a negative electrode active material such as graphite is applied to a negative electrode current collector plate. The separator 13 is a square sheet such as a microporous resin film. Then, on both surfaces of each negative electrode 12, a separator 1 having the same size as the negative electrode 12 is previously formed.
3 are respectively fixed. Thus, the separator 1
The negative electrode 12 to which 3 is fixed is coated, for example, with an adhesive such as PVDF on a long strip-shaped negative electrode and a separator successively, pressed together by a roll press, continuously bonded and dried and fixed, and this is shown in FIG. By punching and forming each of such predetermined shapes, it is possible to efficiently manufacture them collectively. In the non-aqueous electrolyte secondary battery of the present embodiment, the positive electrode 11 must necessarily face the negative electrode 12, and thus a long strip is punched and formed into a slightly smaller size than the negative electrode 12.

The positive electrode 11 and the negative electrode 12 to which the separator 13 is fixed are alternately arranged one by one (electrode arranging step). In the non-aqueous electrolyte secondary battery, since the positive electrode 11 must always face the negative electrode 12, the negative electrodes 12 to which the separators 13 are fixed are disposed at the left and right ends, respectively. Then, as shown in FIG.
The lower portions of the support members 2 are supported by support members 3, respectively, and these support members 3 are swung so as to open the fan around the lower part.
Then, the distance between the opposing surface 11a of the positive electrode 11 and the opposing surface 13a of the separator 13 fixed to the negative electrode 12 increases as the distance increases.

When the electrodes 11 and 12 spread in a fan shape in this manner, an adhesive A such as PVDF is sprayed from above between the electrodes 11 and 12 so that the positive electrode 11 is sprayed.
Separator 1 fixed to each opposing surface 11a and negative electrode 12
This adhesive A is applied to each of the opposing surfaces 13a of No. 3 (adhesive application step). At this time, the adhesive A may be applied by a method other than spraying, or may be applied to only one of the opposing surfaces 11a or 13a between the electrodes 11 and 12. Instead of applying the adhesive A, a double-sided adhesive sheet may be inserted between the opposing surface 11a of the positive electrode 11 and the opposing surface 13a of the separator 13 fixed to the negative electrode 12 (insertion of the adhesive sheet). Process). The double-sided adhesive sheet is formed by forming an adhesive in a sheet shape, or by forming an adhesive layer on both sides of a sheet material such as a thin resin or paper. Further, these adhesives (adhesive A) and double-sided adhesive sheets must be stable with respect to the electrolytic solution, and must be capable of impregnating or flowing the electrolytic solution.

When the application of the adhesive A is completed, the support 3
Are moved so that the fan closes, whereby the opposing surface 11a of the positive electrode 11 and the opposing surface 13a of the separator 13 fixed to the negative electrode 12 are brought into close contact with each other (electrode bonding step). When the electrodes 11 and 12 adhered to each other are dried in an atmosphere of 80 ° C. while being pressed from both sides, the opposing surfaces 11 a and 13 a are fixed to each other, and a laminated power generating element as shown in FIG. 1 is formed.

The power generating element 1 is, as shown in FIG.
A non-aqueous electrolyte secondary battery is formed by covering with an aluminum laminate sheet 2 having a barrier property, filling the inside with a non-aqueous electrolyte, and sealing the periphery (a power-generating element storage step). At this time, the leads 4 connected to each of the positive electrode 11 and each of the negative electrodes 12 of the power generating element 1 are securely sealed with the tips protruding from between the laminated aluminum laminate sheets 2. The non-aqueous electrolyte secondary battery formed as described above can be housed in, for example, a card-type outer case and used as a card-type secondary battery. Note that the thicknesses of the positive electrode 11, the negative electrode 12, and the separator 13 shown in FIGS. 1 to 3 are drawn thicker than they actually are in order to make the configuration of the power generating element 1 easily understandable.

In the non-aqueous electrolyte secondary battery having the above structure, the positive electrode 11 is further fixed to the negative electrode 12 to which the separator 13 is fixed, and the laminated power generating element 1 is integrated. There is no need to stop or store it in a battery can or the like and press it. Therefore, not only is the production of the power generating element 1 easy, but even if the power generating element 1 is stored in a flexible battery container such as the aluminum laminate sheet 2 as it is, the distance between the positive electrode 11 and the negative electrode 12 changes. In addition, there is no fear that the overlap between the positive electrode 11, the negative electrode 12, and the separator 13 is shifted. Moreover, a plurality of positive electrodes 1
Since it is possible to apply the adhesive A or the like to the first and negative electrodes 12 at a time and bond them together, the productivity of the power generating element 1 can be increased.

In the above embodiment, the separator 13
Although the case where the positive electrode 11 is adhered to the entire surface of the negative electrode 12 to which is adhered has been described, these may be partially adhered. Moreover, in this case, the adhesive (adhesive A) or the double-sided adhesive sheet may not be able to impregnate the electrolyte.

In the above embodiment, the separator 13
Has been described in advance, the separator 13 is fixed to the positive electrode 11 or is fixed to one surface of the positive and negative electrodes 11 and 12 if insulation can be reliably performed. You can also put it.

Further, in the above embodiment, each electrode 11,
The case where the adhesive A is applied by spreading the fan 12 in a fan shape has been described. However, if the distance between the opposing surfaces 11a and 13a is sufficiently large, the application of the adhesive A and the like can be performed while the electrodes 11 and 12 remain parallel. Can also be performed.

Further, in the above embodiment, the non-aqueous electrolyte secondary battery has been described. However, the present invention is not limited to this and can be similarly applied to a primary battery or another secondary battery. However, in the case of a secondary battery that generates gas during charging, it is necessary to take measures to cope with the generation of gas. Further, the configurations of the positive electrode 11, the negative electrode 12, and the separator 13 can be arbitrarily changed according to the type of the battery.

Further, in the above-described embodiment, the stacked power generating element 1 has been described. However, the present invention can be similarly applied to a power generating element having another structure such as a wound type. In the case of a wound type, an adhesive A is applied immediately before winding the strip-shaped positive and negative electrodes 11 and 12, and tension is applied to the wound electrodes, thereby pressing and bonding.

[0027]

As is clear from the above description, according to the battery manufacturing method of the present invention, the positive and negative electrodes can be fixed by bonding via a separator to integrate the power generating element. The production of the power generating element becomes easy. Moreover, since there is no risk that the distance between the electrodes changes or the electrodes and separators are displaced, this power generation element can be housed in a flexible sheet-shaped battery container or the like. It can contribute to cost reduction by reducing weight and weight.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a longitudinal sectional view illustrating a process of manufacturing a power generating element of a nonaqueous electrolyte secondary battery.

FIG. 2, showing an embodiment of the present invention, is a longitudinal sectional view illustrating a configuration of a power generating element of a nonaqueous electrolyte secondary battery.

FIG. 3, showing one embodiment of the present invention, is a longitudinal sectional view showing the structure of an integrated power generating element.

FIG. 4 illustrates one embodiment of the present invention, and is a perspective view of a nonaqueous electrolyte secondary battery in which a power generation element is sealed with an aluminum laminate sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power generation element 2 Aluminum laminated sheet 11 Positive electrode 12 Negative electrode 13 Separator A Adhesive

Claims (4)

[Claims] 1. A power generating element comprising: positive and negative electrodes having a separator fixed to one or both of them alternately arranged one by one or more alternately in close proximity via a separator fixed to at least one of the electrodes; In the method of manufacturing a battery, an electrode arranging step of arranging positive and negative electrodes alternately one by one or more at intervals through a separator fixed to at least one of the electrodes; An adhesive application step of applying an adhesive to one or both of the arranged positive and negative electrodes or an opposite surface of the separator fixed to the electrode; and an opposite of the positive and negative electrodes arranged at intervals. And an electrode bonding step of forming a power generating element by bringing the surfaces or the opposing surfaces of the separator fixed to the electrode into close contact with each other to form a power generating element. Construction method. 2. The battery manufacturing method according to claim 1, wherein in the electrode disposing step, the distance between the positive and negative electrodes is arranged such that one end of the opposing surface is wider than the other end. 3. The adhesive applying step is an adhesive sheet inserting step of inserting a double-sided adhesive sheet between opposing surfaces of positive and negative electrodes arranged at an interval or an opposing surface of a separator fixed to this electrode. The method for manufacturing a battery according to claim 1 or 2, wherein 4. A power generating element storing step of storing the power generating element formed in the electrode bonding step in a sheet-like battery container having a barrier property. 3. The method for producing a battery according to item 1.