JPH10275630A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the manufacture of a power generating element easy and provide a battery capable of housing in a flexible sheet-shaped battery container by sticking a positive electrode, a negative electrode, and a separator interposed between both electrodes to integrate a power generating element. SOLUTION: A power generating element 1 is constituted with a plurality of positive electrodes, negative electrodes, and separators. The positive electrode and the negative electrode are alternately arranged one by one and the separator is arranged between the positive and negative electrodes. The facing surfaces of the positive electrode, the negative electrode, and the separator are coated with an adhesive, and they are stacked and stuck to form a stacked type power generating element 1. The power generating element 1 is covered with an aluminum laminated sheet 2 having a barrier property, a nonaqueous electrolyte is filled inside, and the periphery is sealed to form a nonaqueous electrolyte secondary battery. At that time, the tip of a lead 3 is projected from between two stacked aluminum laminated sheets 2, and they are surely sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery having a power generating element in which positive and negative electrodes are alternately arranged close to each other via a separator.

[0002]

2. Description of the Related Art A battery (an active material holding type chemical battery including a primary battery and a secondary battery) generally includes a power generating element in which positive and negative electrodes are arranged close to each other via a separator. 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 in which one strip-shaped positive and negative electrode is wound via two strip-shaped separators is housed in a cylindrical battery container. In addition, in a stacked prismatic battery, a power generating element in which a plurality of thin plate-like positive and negative electrodes are stacked via a plurality of sheet-like separators is housed in a square battery container.

[0003]

However, in the conventional power generating element of a battery, since the electrode and the separator are wound or laminated in a state in which the electrode and the separator are simply overlapped, the electrode and the separator do not come into close contact with each other. In order to prevent the electrode from being lifted up and changing the distance between the electrodes, and the overlapping of these electrodes and separators, a robust battery consisting of a metal can, etc., which is wound and laminated and then temporarily stopped with tape etc. It has to be stored in a container and pressed, which not only complicates operations such as tape fixing, but also causes a problem that the battery container is thick, heavy and expensive.

[0004] The present invention has been made in view of the above circumstances, and by fixing the positive and negative electrodes and a separator interposed therebetween to integrate the power generating element, manufacturing of the power generating element is facilitated. It is another object of the present invention to provide a battery that can be stored in a flexible sheet-like battery container or the like.

[0005]

In order to solve the above-mentioned problems, the present invention relates to a battery provided with a power generating element in which positive and negative electrodes are alternately arranged one by one or more via a separator. Each separator of the power generating element is fixed to the adjacent positive and negative electrodes.

According to the means, the positive and negative electrodes and the separator interposed therebetween are fixed, so that the power generating element can be integrated. Therefore, even if the 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. ,
Not only is the production of the power generating element easy, but also the material and shape of the battery container are not limited.

[0007] In the case of a secondary battery in which gas is generated between the electrodes during charging (mainly an aqueous electrolyte secondary battery), if the positive and negative electrodes and the separator are fixed on the entire surface, there is a possibility that outgassing may worsen. is there. However, in the case of a non-aqueous electrolyte secondary battery, almost no gas is generated during charging, so that no problem occurs even if the positive and negative electrodes and the separator are fixed as described above.

Further, each of the separators of the power generating element is partially fixed to adjacent positive and negative electrodes.

According to the means, the positive and negative electrodes and the separator interposed therebetween are partially fixed,
Also in this case, the power generation element can be integrated. Therefore, even if the power generating element is not fixed with tape or stored in a battery can or the like, the distance between the electrodes is not changed, and the overlapping of the electrodes and the separator is not degraded, so that the battery characteristics are not deteriorated. Not only makes it easier to manufacture
The material and shape of the battery container are not limited.
In addition, since the electrode and the separator are not in close contact with each other over the entire surface, the filling of the electrolytic solution becomes reliable and easy, and gas can be released during charging.

Further, the power generation element is housed in a sheet-like battery container having a barrier property.

According to the means, since the positive and negative electrodes and the separator interposed therebetween can be fixed and integrated, even if the power generating element is housed in a flexible sheet-like battery container, There is no possibility that the distance between the electrodes or the separator is shifted or the distance between the electrodes is changed. Therefore, this battery container can be made thin, lightweight, and inexpensive.

Further, the above-mentioned batteries are characterized by being non-aqueous electrolyte secondary batteries.

According to the means, since the battery is used for a non-aqueous electrolyte secondary battery in which almost no gas is generated between the electrodes during charging, even if the positive and negative electrodes of the power generating element and the separator are fixed,
There is no need to worry about degassing.

[0014]

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

1 to 3 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a configuration of a power generating element of a non-aqueous electrolyte secondary battery, and FIG. FIG. 3 is a perspective view of a non-aqueous electrolyte secondary battery sealed with a sheet, and FIG. 3 is a longitudinal sectional view showing a process of manufacturing a power generation element of the non-aqueous electrolyte secondary battery.

In this embodiment, as shown in FIG. 2, a non-aqueous electrolyte secondary battery in which a laminated power generating element 1 is covered with an aluminum laminate sheet 2 and sealed will be described. As shown in FIG. 3, the power generation element 1 includes a plurality of positive electrodes 11, a plurality of negative electrodes 12, and separators 13. The positive electrode 11 is a rectangular thin plate having a positive electrode current collector coated with a positive electrode active material such as a lithium-cobalt composite oxide, and the negative electrode 12 is a square thin plate having a negative electrode current collector coated with a negative electrode active material such as graphite. It is. The separator 13 is a square sheet such as a microporous resin film. And the positive electrode 11 and the negative electrode 12 are 1
The separators 13 are alternately arranged one by one, and one separator 13 is arranged between the positive electrode 11 and the negative electrode 12.
In the nonaqueous electrolyte secondary battery of the present embodiment, the positive electrode 11
Must always face the negative electrode 12, so that the positive electrode 11 is formed in a slightly smaller size than the negative electrode 12, and the negative electrodes 12 are arranged at the upper and lower ends of the laminate, respectively. The separator 13 is formed to have the same size as the negative electrode 12 to ensure insulation, and is arranged above and below the negative electrode 12 disposed at the upper and lower ends of the laminate.

The positive electrode 11, the negative electrode 12, and the separator 13
For example, an adhesive such as PVDF is applied to the opposing surfaces, and they are superposed and adhered to each other. Then, as shown in FIG. 1, the positive electrode 11, the negative electrode 12, and the separator 13 are stacked and fixed, and the stacked power generating element 1 is formed. Note that an adhesive layer may be formed on both surfaces of the separator 13 in advance, and the opposing surfaces of the positive electrode 11 and the negative electrode 12 may be overlapped and adhered to this adhesive layer. The separator 13 and the positive electrode 11 or the negative electrode 12 may be bonded via a thin sheet formed on both surfaces. The sheet on which the adhesive or the adhesive layer is formed must be stable with respect to the electrolytic solution and be capable of impregnating or flowing the electrolytic solution. The positive electrode 11, the negative electrode 12 and the separator 13 may be bonded together at the same time. Alternatively, for example, the negative electrode 12 and the separator 13 may be bonded first, and then the positive electrode 11 may be bonded thereto. Alternatively, a plurality of the sheets of the positive electrode 11, the negative electrode 12, and the two sheets of the separators 13 may be further laminated and adhered.

The power generating element 1 is, as shown in FIG.
A nonaqueous electrolyte secondary battery is formed by covering with an aluminum laminate sheet 2 having a barrier property, filling the inside with a nonaqueous electrolyte, and sealing the periphery. At this time, the leads 3 respectively connected to the respective positive electrodes 11 and the respective negative electrodes 12 of the power generating element 1
Is securely sealed with the leading end protruding from the space 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 and 3 are drawn thicker than they actually are in order to make the configuration of the power generating element 1 easily understandable.

The non-aqueous electrolyte secondary battery having the above-described structure has a positive electrode 1
Since the stack 1, the negative electrode 12, and the separator 13 are fixed to each other and the laminated power generating element 1 is integrated, there is no need to fix the power generating element 1 with tape or the like 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.

In the above embodiment, the case where the entire surface of both sides of the positive electrode 11 is fixed to the separator 13 and the entire surface of the negative electrode 12 is fixed to the separator 13 is also described. Moreover, in this case, the sheet on which the adhesive or the adhesive layer is formed may not be able to be impregnated with the electrolytic solution.

In the above embodiment, a 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 and other secondary batteries.
However, in the case of a secondary battery that generates gas when charging,
It is necessary to take measures to cope with this gas generation. Furthermore, the configuration of the positive electrode 11, the negative electrode 12, and the separator 13
It can be arbitrarily changed according to the type of these batteries and the like.

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.

[0023]

As is apparent from the above description, according to the battery of the present invention, since the positive and negative electrodes and the separator can be fixed to each other to integrate the power generating element, the production of the power generating element is easy. become. 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 one embodiment of the present invention, is a longitudinal sectional view illustrating a configuration of a power generation element of a nonaqueous electrolyte secondary battery.

FIG. 2, showing one embodiment of the present invention, is a perspective view of a nonaqueous electrolyte secondary battery in which a power generation element is sealed with an aluminum laminate sheet.

FIG. 3, 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.

[Explanation of symbols]

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

Claims (4)

[Claims] 1. A battery provided with a power generating element in which positive and negative electrodes are alternately arranged one by one or more via a separator, wherein each separator of the power generating element is fixed to an adjacent positive and negative electrode. Battery. 2. The battery according to claim 1, wherein each separator of the power generation element is partially fixed to adjacent positive and negative electrodes. 3. The battery according to claim 1, wherein the power generation element is housed in a sheet-like battery container having barrier properties. 4. The battery according to claim 1, wherein the battery is a non-aqueous electrolyte secondary battery.