US 8013568

Here's a concise summary of US Patent 8013568, based on the provided patent text fetched on 2026-05-14:

US Patent 8013568: Summary and Claims Overview

• Title: Contact-less chargeable battery and charging device, battery charging set, and charging control method thereof
• Assignee: LS Cable and Systems Ltd
• Inventors: Dong-Young Park, Sung-Wook Moon, Sung-wook Choi, Gwang-Hee Gwon, Sub Han, Jung-Bum Kim
• Filing Date: 2006-05-08
• Issue Date: 2011-09-06

Abstract:
The present invention relates to a wireless charger for a mobile communication terminal, which allows charging a plurality of batteries in a conveniently way without any terminal connection of the batteries to chargers for various mobile communication terminals such as a cellular phone and PDA and also allows intercepting electromagnetic waves while the charger is used, by means of Faraday's law. The wireless charger of the present invention includes a charger body having an electromagnetic wave intercepting means; a charging pad received in the charger body; and at least one battery that is to be charged by means of induced electromotive force generated by the charging pad, wherein the charger body includes a power supply means, a housing having a receiver for receiving the charging pad and connected to the power supply means, and a cover hinged to the housing.

Plain-Language Overview of Independent Claims:

• Claim 1 (Contact-less chargeable battery): This claim describes a rechargeable battery that charges wirelessly. It includes a component to receive high-frequency alternating current (AC) via a magnetic field from an external charger, a rectifier to convert this AC into direct current (DC), and a constant voltage/current supplier to charge the battery cell. A crucial element is an overvoltage monitoring unit that checks voltages across the constant voltage/current supplier and wirelessly communicates this information back to the external charging device to prompt a change in the magnetic field's strength, thus adjusting the charging power.
• Claim 7 (Contact-less charging circuit module): This claim focuses on the contact-less charging circuit module itself, designed to be connected to a battery cell. It includes the same functional components as the battery in Claim 1: a high-frequency AC current inducing unit, a rectifier, a constant voltage/current supplier, and an overvoltage monitoring unit that communicates wirelessly to request a change in the magnetic field intensity from the charging device.
• Claim 13 (Contact-less charging device): This claim describes the charging device component of the wireless charging system. It comprises a unit to generate a magnetic field (e.g., a primary coil) by receiving an AC current, a high-frequency power driving unit to supply AC current to the magnetic field generator, and a charging power adjusting unit. This adjusting unit wirelessly receives monitoring results (such as an overvoltage indication) from the battery and then controls the high-frequency power driving unit to modify the AC current supplied to the magnetic field generator, thereby adjusting the charging power delivered to the battery.
• Claim 21 (Battery charging set): This claim covers the complete system, including both the contact-less chargeable battery and the charging device. It emphasizes that the magnetic field generation by the charger and the current induction in the battery occur intermittently. The battery's overvoltage monitoring unit transmits its feedback wirelessly during periods when no high-frequency AC current is being induced in the battery. Correspondingly, the charging device's power adjusting unit receives this feedback when it is not actively applying a high-frequency AC current to generate the magnetic field, allowing for undisturbed wireless communication and subsequent power adjustment.
• Claim 23 (Method for controlling charging): This claim details a method for managing contact-less battery charging. The method involves: (a) the charging device intermittently generating a magnetic field by applying high-frequency AC current to a primary coil; (b) the battery's secondary coil intermittently receiving an induced high-frequency AC current from this magnetic field; (c) rectifying this induced AC current to DC; (d) charging the battery cell with the DC current via a constant voltage/current supplier; (e) monitoring voltages at the constant voltage/current supplier within the battery and wirelessly sending a monitoring result to the charging device during periods when no high-frequency AC current is being induced in the secondary coil; and (f) adjusting the power of the high-frequency AC current applied to the primary coil by the charging device based on the received monitoring result.

Legal Status and Litigation:
US Patent 8013568B2 is currently Active, with an adjusted expiration date of 2028-05-27.

Litigation related to this patent family has been reported:

• A PTAB case, IPR2025-01141, was filed but was "Not Instituted - Merits".
• A US case (3:24-cv-09194) has been filed in the California Northern District Court.
• The first worldwide family litigation has also been initiated.

Searches of USPTO and CAFC 2026 dockets for the specific patent number 8013568 did not yield additional or conflicting information beyond what was already present in the provided patent text.