JPH11135151A - Battery from which a plurality of output voltages can be taken out - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply different voltages to electrical equipment with a simple circuit by incorporating three kinds or more of polar plates with their different generation voltage, in which each polar plate is connected to an output terminal, and selecting the output terminal capable of the output voltage. SOLUTION: A power collecting plate 15B of a first positive electrode 4 is connected to a sealing plate 11, and a power collecting plate 15C of a second positive electrode 5 is connected to a rivet terminal 10, respectively via spot welding. Thereby, different outputs can be taken out from the sealing plate 11 and the rivet terminal 10. A nominal voltage between the sealing plate 11 connecting the first positive electrode 4 and a battery case 1 is 3.6 V, and a nominal voltage between a rivet terminal 10 connecting a second positive electrode 5 and the battery case becomes 1.5 V. Further, when the sealing plate 11 and the rivet terminal 10 are an output terminal, the output voltage can be set to 2.1 V. In this case, the sealing plate 11 is a positive electrode, and the rivet terminal 10 is a negative electrode. When the sealing plate 11 and the rivet terminal 10 are discharged as an output terminal, the first positive electrode 4 is discharged, and the second positive electrode 5 is charged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery capable of outputting a plurality of voltages.

[0002]

2. Description of the Related Art A conventional battery has a constant output voltage. For example, the nominal voltage of a lithium ion secondary battery is 3.6V, and the nominal voltage of a nickel-hydrogen battery or a nickel-cadmium battery is 1.2V. The battery voltage is
It is determined by the materials of the positive electrode and the negative electrode.

[0003] In an electric device driven by a battery, the driving voltage of each circuit provided therein is not always constant. For example, a portable microcomputer
The voltage for operating the built-in memory and the voltage for operating the LSI are not all the same.

[0004]

As described above, an electric device having a built-in circuit driven by a voltage different from the battery voltage needs to have a built-in circuit for increasing the battery voltage or a circuit for decreasing the battery voltage. And the power supply circuit becomes complicated. Furthermore, since the voltage boosting circuit and the voltage step-down circuit consume power by themselves, 100% of the power supplied from the battery cannot be supplied to other circuits, and there is a disadvantage that the use efficiency of the battery is reduced. In particular, the voltage booster circuit has a drawback that the circuit is significantly complicated because the DC voltage of the battery is converted to AC and then the voltage is converted, and then converted to DC. Further, a step-down circuit that lowers a voltage by using a voltage drop of a transistor has a drawback in that power consumption in the transistor is large and power stored in a battery cannot be used effectively.

SUMMARY OF THE INVENTION The present invention has been developed with the object of solving the above drawbacks. It is an object of the present invention to supply different voltages to electric equipment with a very simple circuit without using a step-down circuit or a step-up circuit. It is an object of the present invention to provide a battery capable of extracting a plurality of output voltages.

[0006]

According to a first aspect of the present invention, a battery capable of extracting a plurality of output voltages includes three or more types of electrode plates having different generated voltages. Each built-in electrode plate is connected to an output terminal, so that the output terminal can be selected and the output voltage can be changed.

The battery according to claim 2 of the present invention is characterized in that the negative electrode 3 and the first positive electrode 4 and the second positive electrode
The positive electrode 5 is built in. This battery uses the negative electrode 3 in common, and outputs different voltages from the negative electrode 3 and the first positive electrode 4 or from the negative electrode 3 and the second positive electrode 5.

In the battery according to a third aspect of the present invention, the negative electrode 3 is made of lithium metal or a lithium alloy.

The battery according to claim 4 of the present invention is characterized in that
_{Mn 2 O 4, LiOH-MnO} 2, LiCoO 2, LiNi
O ₂ , MnO ₂ , V ₂ O ₅ , V ₆ O ₁₃ , LiV ₃ O ₅ , LiT
i ₂ O ₄ , TiSeNbSe ₃ , MoS ₂ , CuCl ₂ , F
A positive electrode containing any of eS as an active material is provided.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. However, the following examples illustrate a battery for embodying the technical idea of the present invention, and the present invention does not specify the battery as follows.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.

The battery shown in FIG. 1 has a cylindrical battery case 1.
And a spiral electrode body 2 inserted into the battery case 1;
An opening side insulating plate 7 provided on the upper surface of the spiral electrode body 2;
The battery pack includes a bottom insulating plate provided on the lower surface of the spiral electrode body, and an insulating spacer provided between the bottom insulating plate and the bottom surface of the battery case.

The battery case 1 is a nickel-plated iron case. The battery case 1 has a cylindrical shape with an outer diameter of 17 mm and a height of 33.5 mm. However, the external shape of the battery of the present invention is not limited to a cylinder, but may be a square shape, an elliptical shape, or the like. In the battery case 1 shown in the figure, the rivet terminal 10 is fixed to the bottom, and the sealing plate 11 is fixed to the opening by air caulking. In order to caulk and fix the sealing plate 11, the battery case 1 is provided with a fitting groove 12 at an opening. The sealing plate 11 is fixed by caulking the battery case 1 in a state of being inserted into the fitting groove 12 via the insulating gasket 13. The battery case 1 is a sealing plate 11 to be fixed,
The opening is hermetically closed.

The rivet terminal 10 is provided in a through hole formed in the bottom of the battery case 1 with an insulating washer 14 made of polypropylene.
, And are fixed in an air-tightly insulated manner. In the battery case 1, the rivet terminal 10 and the sealing plate 11 are used as positive terminals, and the cylindrical portion of the battery case 1 is used as three negative terminals.

The spiral electrode body 2 includes a negative electrode 3 and a first positive electrode 4.
And the second positive electrode 5 are laminated with a separator 6 interposed therebetween, and are wound. The separator 6 is a polyethylene microporous membrane. However, as the separator, any sheet material that insulates the electrode plates laminated on both sides and can penetrate the electrolyte can be used.

FIG. 2 shows the developed negative electrode 3 before being wound around the spiral electrode body 2. The negative electrode 3 shown in this figure is a lithium-aluminum alloy having a thickness of 0.15 mm,
It is manufactured by cutting to a predetermined size. Negative electrode 3 in this figure
When a coil is wound around a spiral electrode body, a current collector plate 15A made of a nickel thin plate is crimped to the outermost peripheral portion, which is the end of winding. Further, except for the vicinity of the current collecting plate 15A of the negative electrode 3 and the tip portion protruding from the negative electrode 3, the current collecting plate 15A
Adhesive tape 1 to block lithium penetration so as to cover
6 is pasted.

FIG. 3 shows the developed first positive electrode 4 before being wound around the spiral electrode body 2. First positive electrode 4 shown in FIG.
Is manufactured by coating the surface of a core with a positive electrode mixture and rolling with a roller. The positive electrode mixture contains a spinel-type lithium-containing manganese oxide (LiMn) as an active material.
₂ O ₄ ), a carbon-based conductive material as a conductive material, polytetrafluoroethylene and water as a binder are mixed at a predetermined ratio so as to have an appropriate viscosity. A metal plate such as a stainless expanded metal is used for the core.

The rolled positive electrode plate is cut into a predetermined size,
After being dried, the first positive electrode 4 is obtained. The first positive electrode 4 is shown in FIG.
As shown in (1), a part of the mixture layer is peeled to expose the expanded metal, and the current collector plate 15B is connected to the exposed portion. As the current collecting plate 15B, for example, a stainless steel plate is used. The current collecting plate 15B is connected to the core body by a method such as spot welding. Further, the first positive electrode 4 in this figure is composed of a current collecting plate 15 near the current collecting plate 15B and a portion other than the protruding tip portion.
It is manufactured by sticking an adhesive tape 16 so as to cover the portion B.

FIG. 4 shows the developed second positive electrode 5 before being wound around the spiral electrode body 2. The second positive electrode 5 shown in FIG.
As in the case of the first positive electrode, the core is coated with a positive electrode mixture on the surface of the core and rolled with a roller. The positive electrode mixture contains a lithium-containing titanium oxide (Li
Ti ₂ O ₄ ), a carbon-based conductive material as a conductive material, and polytetrafluoroethylene as a binder and water in a predetermined ratio are mixed to produce an appropriate viscosity. A metal plate such as a stainless expanded metal is used for the core.

The rolled positive electrode plate is cut into a predetermined size,
The second positive electrode 5 is manufactured by performing a drying process. The second positive electrode 5
A part of the mixture layer is peeled to expose the ex-band metal, and the current collector plate 15C is connected to the exposed portion. As the current collector plate 15C, for example, a stainless thin plate is used in the same manner as the first positive electrode. The current collecting plate 15C is connected to the core body by a method such as spot welding. Further, the second positive electrode 5 in this figure is manufactured by attaching an adhesive tape 16 so as to cover the vicinity of the current collector 15C and the portion of the current collector 15C other than the protruding tip portion.

The negative electrode 3, the first positive electrode 4, and the second positive electrode 5 are laminated and wound via a polyethylene microporous film serving as a separator 6 to form a spiral electrode body 2. The spiral electrode body 2 is inserted into the battery case 1, and contacts the inner surface of the battery case 1 to electrically connect the outermost negative electrode 3 of the current collector plate 15 </ b> A. However, the negative electrode can also be electrically connected directly to the inner surface of the battery case without using a current collector. The current collecting plate 15B of the first positive electrode 4 is connected to the sealing plate 11 and the current collecting plate 15C of the second positive electrode 5 is connected to the rivet terminal 10 by spot welding. The current collector plate 15C of the second positive electrode 5 has a rivet terminal 1 inserted with a welding electrode inserted into the center of the spiral electrode body 2.
0 is spot-welded. Connect the second positive electrode 5 to the rivet terminal 1
0, the current collecting plate 15B of the first positive electrode 4 is connected to the sealing plate 1
1, and then the electrolyte is injected, and the opening is closed with a sealing plate 11.

As the electrolytic solution, a non-aqueous electrolytic solution is used. This electrolytic solution is composed of propylene carbonate (PC),
-Production by dissolving lithium hexafluorophosphate (LiPF ₆ ) as a solute at a ratio of 1 mol / l in a solvent in which dimethoxyethane (DME) is mixed at a ratio of 1: 1 by volume. Is done.

FIG. 5 shows the discharge characteristics of the above lithium metal secondary battery. As shown in FIG.
Different output voltages can be obtained from the rivet terminal 10. The nominal voltage between the sealing plate 11 connecting the first positive electrode 4 and the cylindrical battery case 1 is 3.6V, the rivet terminal 10 connecting the second positive electrode 5 and the battery case 1
Is 1.5V.

Although not shown, the battery can have an output voltage of 2.1 V using the sealing plate and rivet terminals as output terminals. In this case, the sealing plate has a positive polarity and the rivet terminal has a negative polarity. When the battery is discharged using the sealing plate and the rivet terminal as output terminals, the first positive electrode 4 is discharged and the second positive electrode 5 is charged.

As described above, a battery having three output terminals can have three different output voltages.

The above battery uses LiM as an active material of the first positive electrode.
n ₂ O ₄ , LiTi ₂ O ₄ for the active material of the second positive electrode, and a lithium alloy for the negative electrode. However, the battery of the present invention
The materials of the positive electrode and the negative electrode are not specified to those described above. In a lithium ion secondary battery, the negative electrode can be made of a carbon material instead of a lithium alloy. Further, the active materials of the positive electrode include LiMn ₂ O ₄ , LiOH—MnO ₂ , LiC
oO ₂ , LiNiO ₂ , MnO ₂ , V ₂ O ₅ , V ₆ O ₁₃ , Li
V ₃ O ₅ , LiTi ₂ O ₄ , TiSeNbSe ₃ , MoS ₂ ,
CuCl ₂ , FeS and the like can be used.

[0027] Lithium metal
The secondary battery uses LiMn as the active material of the positive electrode. _TwoO_Four, LiCo
O_Two, LiNiO_TwoThe nominal voltage is 3.6V and the active material is
MnO_Two, V_TwoO_FiveThe nominal voltage is 3V and the active material is Li
Ti_TwoO_FourNominal voltage of 1.5V for FeS
Can be.

As described above, in the battery of the present invention, the output voltage can be adjusted by selecting the negative electrode and the positive electrode. For the negative electrode and the positive electrode, all materials that have been used in batteries or that will be developed in the future can be used. Further, as for the electrolyte solution, all of the electrolyte solution used in the current battery and further used in the battery developed in the future are selected in consideration of the materials of the negative electrode and the positive electrode.

Further, the present invention does not specify a battery as a secondary battery. A non-rechargeable primary battery can also be used. Further, the above-mentioned batteries have a first positive electrode and a second positive electrode built in with a common negative electrode. However, three or more kinds of positive electrodes can be stacked and built in with a common negative electrode. Further, a plurality of negative electrodes can be stacked and built in using a common positive electrode.

[0030]

The battery of the present invention has the feature that different voltages can be supplied to electric equipment with a very simple circuit without using a step-down circuit or a step-up circuit. that is,
This is because the battery of the present invention incorporates three or more types of electrode plates having different generated voltages, and each of the incorporated electrode plates is connected to an output terminal. This battery has an excellent feature that an output terminal connected to each electrode plate is selected, an output voltage is adjusted, and two or more types of power can be supplied by one battery. This eliminates the need for a complicated circuit such as a voltage booster circuit or a voltage step-down circuit to supply a voltage to a circuit having a different drive voltage of an electric device as in the related art. Can be supplied. Furthermore, since a circuit that consumes power by itself, unlike a voltage boosting circuit or a voltage step-down circuit, is not required, there is a feature that the efficiency of using power supplied from a battery can be improved. Therefore, the battery of the present invention
As a very simple structure, take out multiple output voltages,
Different voltages can be supplied to the electric device, the circuit configuration of the electric device can be simplified, the manufacturing cost can be reduced, and the power stored in the battery can be used efficiently and efficiently.

Further, the battery according to the second aspect of the present invention has a feature that an electrode plate for extracting different voltages can be arranged in a small space. That is, this battery incorporates a negative electrode and a first positive electrode and a second positive electrode having different potentials with respect to the negative electrode, and a different voltage is applied to the negative electrode and the first positive electrode or between the negative electrode and the second positive electrode while the negative electrode is common. Because it is outputting. Since this battery uses a negative electrode in combination with the first positive electrode and the second positive electrode, there is a feature that these electrodes can be efficiently disposed in the battery to increase the electric capacity.

Further, the batteries according to claims 3 and 4 of the present invention have a feature that the nominal voltage can be changed by changing the active material of the positive electrode and the material used for the negative electrode. This battery can be conveniently used by adjusting the nominal voltage to an optimum value according to the type and purpose of use of electrical equipment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a battery capable of extracting a plurality of output voltages according to an embodiment of the present invention.

2 is a plan view of a developed negative electrode before being wound around a spiral electrode body of the battery shown in FIG. 1;

FIG. 3 is a plan view of a developed first positive electrode before being wound around the spiral electrode body of the battery shown in FIG. 1;

FIG. 4 is a plan view of a developed second positive electrode before being wound around the spiral electrode body of the battery shown in FIG. 1;

FIG. 5 is a graph showing discharge characteristics of a battery according to an example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Battery case 2 ... Spiral electrode body 3 ... Negative electrode 4 ... 1st positive electrode 5 ... 2nd positive electrode 6 ... Separator 7 ... Opening side insulating plate 8 ... Bottom side insulating plate 9 ... Insulating spacer 10 ... Rivet terminal 11 ... Sealing plate 12 ... fitting groove 13 ... insulating gasket 14 ... insulating washer 15A ... current collector plate 15B ... current collector plate
15C: current collector plate 16: adhesive tape

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01M 4/38 H01M 4/38 Z 4/58 4/58

Claims (4)

[Claims] 1. An electronic apparatus comprising three or more types of electrode plates having different generated voltages, each electrode plate being connected to an output terminal, and being configured so that an output terminal can be selected and an output voltage can be changed. A battery capable of extracting a plurality of output voltages. 2. A plurality of output voltages according to claim 1, wherein a first positive electrode (4) and a second positive electrode (5) having different potentials with respect to the negative electrode (3) and the negative electrode (3) are incorporated. Battery that can be removed. 3. The battery according to claim 2, wherein the negative electrode is made of a lithium metal or a lithium alloy. 4. The positive electrode is made of LiMn ₂ O ₄ , LiOH-Mn.
O ₂ , LiCoO ₂ , LiNiO ₂ , MnO ₂ , V ₂ O ₅ , V
₆ O ₁₃ , LiV ₃ O ₅ , LiTi ₂ O ₄ , TiSeNbS
_{2. The} battery according to claim 1, wherein the battery includes one of e ₃ , MoS ₂ , CuCl ₂ , and FeS as an active material.