JPH05152001A - Battery charging method - Google Patents

Abstract

PURPOSE:To allow quick charging of a secondary battery. CONSTITUTION:A magnet 6 is arranged outside of a secondary battery in which positive electrodes 1, separators 2, negative electrodes 3 and electrolyte 4 are housed jar 5, and this magnet 6 applies a magnetic field on this secondary battery to charge it. The magnetic field moves ions in the electrolyte so that increased inner resistance and rise of overvoltage caused by diffusion of ion concentration as in a prior charging method can be suppressed so as to allow quick charging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging method, and more particularly, to a charging method for a secondary battery such as an electric vehicle that requires rapid charging.

[0002]

2. Description of the Related Art As a secondary battery to be mounted on an electric vehicle, a lead storage battery using lead dioxide for a positive electrode, lead for a negative electrode, glass fiber for a separator, and a sulfuric acid aqueous solution for an electrolytic solution is known.

[0003]

However, such a lead storage battery has a problem that when it is rapidly charged, the diffusion of ion concentration becomes a rate-determining step and the charging rate is limited.

[0004]

In order to solve the above-mentioned problems, the present invention provides a secondary battery having an electrolytic solution with a magnet disposed outside the secondary battery and applying a magnetic field to the secondary battery to charge the secondary battery. It is characterized by.

[0005]

[Operation] Therefore, in the present invention, since the ions are moved by the magnetic field applied to the secondary battery, it is possible to suppress an increase in internal resistance and an increase in overvoltage caused by diffusion of the ion concentration, and to perform quick charging easily. You can

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining the charging method of the present invention.

In FIG. 1, 1 is a positive electrode made of lead dioxide, 2 is a separator made of glass fiber, 3 is a negative electrode made of lead, 4 is an electrolytic solution made of dilute sulfuric acid, and these are a battery case 5.
Are housed in a lead-acid battery. Reference numeral 6 denotes a samarium-cobalt-based prismatic permanent magnet as a magnet arranged to apply a magnetic field to the lead storage battery, which is arranged on the upper and lower surfaces of the battery case 5.

Next, in order to compare the charging method of the present invention in which the magnets 6 are arranged on the upper and lower surfaces of the battery case for charging and the conventional charging method in which no magnets are arranged, 50% discharged lead is used. Prepare 5 storage batteries, 0.1C (0.1 hour rate) and 5C respectively
When the battery was charged to a charged state of 95% at (5 hour rate) and the average required time was examined, the results shown in Table 1 were obtained. The strength of the magnetic field generated by the magnet 6 is 500 Oe.

[0009]

[Table 1]

From Table 1, charging at 5C showed almost no difference between the average required time by the charging method of the present invention and the average required time by the conventional charging method, while the average required time by 0.1C was 0.1C.
It can be seen that the average charging time of the charging method of the present invention is about half of the average required time of the conventional charging method, and that the charging method of the present invention is suitable for rapid charging.

In the above embodiment, a lead storage battery using an electrolytic solution containing dilute sulfuric acid has been described. However, an alkaline storage battery using an electrolytic solution containing potassium hydroxide or sodium hydroxide or an electrolytic solution containing a non-aqueous electrolytic solution is used. It goes without saying that it can also be applied to a non-aqueous electrolyte secondary battery using a liquid.

Further, in the above embodiment, a permanent magnet is used as the magnet 6, but it goes without saying that an electromagnet can also be used.

[0013]

As described above, the charging method of the present invention is suitable for rapid charging, and can be applied to a charging method for a secondary battery such as an electric vehicle that requires rapid charging. .

[Brief description of drawings]

FIG. 1 is a diagram for explaining a charging method of the present invention.

[Explanation of symbols]

 1 Positive Electrode 2 Separator 3 Negative Electrode 4 Electrolyte 5 Battery Case 6 Magnet

Claims (6)

[Claims] 1. A charging method, wherein a magnet is arranged outside a secondary battery having an electrolytic solution, and a magnetic field is applied to the secondary battery by the magnet to charge the secondary battery. 2. The charging method according to claim 1, wherein the secondary battery is a lead storage battery using an aqueous sulfuric acid solution as an electrolytic solution. 3. The charging method according to claim 1, wherein the secondary battery is an alkaline storage battery using potassium hydroxide or sodium hydroxide as an electrolytic solution. 4. The secondary battery is a non-aqueous electrolyte secondary battery using a non-aqueous electrolyte as an electrolyte.
The charging method described in the item. 5. The charging method according to claim 1, wherein the magnet is a permanent magnet. 6. The charging method according to claim 1, wherein the magnet is an electromagnet.