SECONDARY BATTERY CONTROL CIRCUIT

• US 20040162698A1
• Filed: 02/10/2004
• Published: 08/19/2004
• Est. Priority Date: 03/16/1999
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Iwaizono, Yoshinori
• Granted Patent: US 7,502,700 B2
• Time in Patent Office: Days
• US Class Current: 702/132
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/007194 of the battery

Abstract

According to the present invention, there is provided a secondary battery control circuit which can perform a reliable charge/discharge control without activating Positive Temperature Coefficient element. The secondary battery control circuit includes a temperature detection section for detecting a temperature of the secondary battery and a system logic for controlling charging/discharging of the secondary battery based on the temperature detected by the temperature detection section. The system logic interrupts the charging of the secondary battery in a case where the temperature detected by the temperature detection section is out of a predetermined first temperature range, and interrupts the discharging of the secondary battery in a case where the temperature detected by the temperature detection section is out of a predetermined second temperature range.

Claims

1. A secondary battery control circuit, comprising:

a liquid detection section for detecting infiltration or generation of a liquid inside a secondary battery or inside a battery pack in which the secondary battery is installed; and

a control section for interrupting charging/discharging of the secondary battery in a case where a liquid is detected by the liquid detection section.

2. A secondary battery control circuit according to claim 1, further comprising a temperature detection section for detecting a temperature of the secondary battery, wherein

the control section controls charging/discharging of the secondary battery based on the temperature detected by the temperature detection section.

3. A secondary battery control circuit according to claim 1, wherein the secondary battery control circuit is formed on a single semiconductor chip.

4. A secondary battery control circuit according to claim 3, wherein the single semiconductor chip is enclosed in a sealing section of the secondary battery.