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Battery system

A battery system and battery technology, applied in the direction of secondary batteries, airtight batteries, circuits, etc., can solve the problems of easy deterioration of batteries and extending the service life of batteries to the target value

Active Publication Date: 2015-04-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when the temperature of the battery when the vehicle is placed increases, the battery is more likely to deteriorate
[0004] If the deterioration of the battery is determined based only on the battery temperature while the vehicle is running, the actual degree of deterioration of the battery becomes higher than the determined degree of battery deterioration, making it impossible to extend the service life of the battery to the target value

Method used

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Embodiment Construction

[0034] figure 1 is a view showing the configuration of the battery system according to the embodiment. figure 1The battery system shown is installed on a vehicle. The vehicle may be a hybrid vehicle or an electric vehicle. As a power source for propelling the vehicle, a hybrid vehicle includes another power source such as an engine and a fuel cell in addition to a battery pack (described below). An electric vehicle includes only a battery pack (described below) as a power source for propelling the vehicle.

[0035] The battery pack 10 includes a plurality of single cells 11 electrically connected in series. Each unit cell 11 may be a nickel metal hydride battery. The number of cells 11 can be set as necessary based on the required output of the battery pack 10 and the like. In the present embodiment, all the cells 11 constituting the battery pack 10 are connected to each other in series; alternatively, the battery pack 10 may include a plurality of cells 11 electrically c...

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Abstract

A battery system that controls charging and discharging operations of a nickel metal hydride battery (11) includes a temperature sensor (23) detecting a temperature of the nickel metal hydride battery and a controller (30) limiting the charging and discharging operations of the nickel metal hydride battery when a negative electrode reserve capacity of the nickel metal hydride battery is smaller than a target value. The controller acquires the temperature of the nickel metal hydride battery when the nickel metal hydride battery is being charged or discharged and the temperature of the nickel metal hydride battery when the nickel metal hydride battery is not being charged or discharged with the use of the temperature sensor. The controller calculates the negative electrode reserve capacities corresponding to the acquired temperatures using a correspondence relationship between the temperature of the nickel metal hydride battery and the negative electrode reserve capacity.

Description

technical field [0001] The present invention relates to a battery system that limits the input and output of a nickel metal hydride battery based on the reserve capacity of the negative electrode in the nickel metal hydride battery. Background technique [0002] In Japanese Patent Application Publication No. 2011-010465 (JP 2011-010465 A), the degree of battery degradation is based on the battery's past temperature history distribution and the actual growth rate of the battery's workload against the battery's temperature. Here, the life of the battery is extended by limiting the output of the battery when necessary. [0003] In JP 2011-010465 A, the temperature history distribution of the battery is established by detecting the battery temperature in one driving cycle. Here, the deterioration of the battery is affected not only by the battery temperature when the vehicle is running, but also by the battery temperature when the vehicle is left. In particular, when the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/34B60W20/00G01R31/36H01M10/48H01M10/44
CPCH01M10/345H01M10/48H01M10/486H01M10/443B60L2240/545Y02T10/7072Y02T90/14B60L53/00B60L58/24Y02E60/10Y02T10/70G01R31/374H01M10/44
Inventor 加贺美征宏
Owner TOYOTA JIDOSHA KK