Second battery control circuit

• US 6,714,882 B1
• Filed: 01/19/2001
• Issued: 03/30/2004
• Est. Priority Date: 03/16/1999
• Status: Expired due to Term

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Iwaizono, Yoshinori
• Primary Examiner(s): WACHSMAN, HAL D
• Application Number:
  US09/700,583
• Time in Patent Office: 1,166 Days
• Field of Search: 702/63-65, 702/57, 702/99, 702/130, 702/132, 702/133, 702/136, 702/182, 702/183, 702/188, 702/FOR.103, 702/FOR.104, 702/FOR.106, 702/FOR.111, 702/FOR.134, 702/FOR.135, 702/FOR.170, 320/152, 320/162, 320/112, 320/107, 320/151-154, 320/137, 320/134, 320/128, 320/130, 320/150, 429/61, 429/62, 429/56, 429/57, 429/59, 429/90, 429/92, 324/429, 324/431, 324/434, 324/426, 340/455, 340/449, 340/636, 340/657, 340/660, 374/137, 374/141, 374/142, 374/163, 374/183, 700/286, 700/291-293, 700/295-297, 700/299
• US Class Current: 702/63
• 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 sections. 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 temperature detection section for detection a temperature of a secondary battery; and

a control section for controlling charging/discharging of the secondary battery based on a temperature detected by the temperature detection section, wherein

the control section interrupts 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 discharging of the secondary battery in the case where the temperature detected by the temperature detection section is out of a predetermined second temperature range,

wherein the secondary battery control circuit is incorporated within a sealing section of the secondary battery, and a battery power is directly obtained by a secondary battery unit which is incorporated within the secondary battery control circuit.

2. The secondary battery control circuit according to claim 1, wherein the predetermined second temperature range includes the predetermined first temperature range.

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