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Secondary-battery temperature-raising apparatus and vehicle having same

A secondary battery and heating device technology, applied in secondary batteries, secondary battery repair/maintenance, battery/fuel cell control devices, etc., can solve problems such as performance degradation, reduced battery capacity, and reduced charge and discharge characteristics

Active Publication Date: 2012-05-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In general, secondary batteries represented by lithium-ion batteries have lower charge and discharge characteristics when the temperature decreases.
For example, in lithium-ion batteries, lithium (Li) is deposited on the negative electrode when charging at low temperature, and as a result, performance degradation such as reduction in battery capacity is caused.

Method used

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  • Secondary-battery temperature-raising apparatus and vehicle having same
  • Secondary-battery temperature-raising apparatus and vehicle having same
  • Secondary-battery temperature-raising apparatus and vehicle having same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0055] figure 1 It is an overall configuration diagram of a temperature rising device for a secondary battery according to the first embodiment of the present invention. Reference figure 1 , The heating device includes: a ripple generating device 20 and a control device 30. The ripple generating device 20 is connected to the secondary battery 10.

[0056] The secondary battery 10 is a rechargeable battery represented by a lithium ion battery or a nickel-hydrogen battery. The secondary battery 10 includes an internal resistance 12. As described later, this internal resistance 12 is temperature-dependent, and at the same time, it varies greatly depending on the frequency of the current flowing through the battery.

[0057] The ripple generation device 20 is controlled by the control device 30 to cause the secondary battery 10 to actively generate a ripple current I of a predetermined frequency. For example, the power semiconductor switching element constituting the ripple generati...

Embodiment approach 2

[0099] In the second embodiment, the secondary battery 10 is a lithium ion battery, and when the precipitation of lithium (Li) in the negative electrode is a problem due to the ripple current in the charging direction, the ripple frequency is set to avoid the generation of Li precipitation. Hereinafter, the way to consider the ripple frequency in this second embodiment will be described.

[0100] Picture 12 It is an equivalent circuit diagram of the electrode / electrolyte interface of the secondary battery 10. Reference Picture 12 The internal resistance of the secondary battery 10 mainly includes: negative electrode precipitation resistance R1-, negative electrode reaction resistance R2-, negative electrode electric double layer capacitor C-, positive electrode reaction resistance R+, positive electrode electric double layer capacitor C+, and electrolyte resistance Rsol.

[0101] The negative electrode precipitation resistance R1- is the charge transfer resistance of the negative...

Embodiment approach 3

[0107] In the third embodiment, the secondary battery 10 is a lithium ion battery, and when the precipitation of lithium (Li) in the negative electrode becomes a problem due to the ripple current in the charging direction, a ripple current is generated so that the average value of the ripple current is The discharge side is biased.

[0108] As a specific method, refer to Figure 9~Figure 11 , For example, by Picture 9 When the illustrated circuit implements the ripple generating device 20, the duty ratio command value d when the ripple rises may be set to a value smaller than 0.5. Or through Picture 9 In the case where the illustrated circuit implements the ripple generating device 20, the necessary energy source for raising the ripple is only the secondary battery 10. Here, even if the duty ratio command value d when the ripple temperature rises is set to 0.5, the ripple current biases the loss in the ripple generation device 20 to the discharge side, so this can be used.

[0...

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PUM

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Abstract

An apparatus for raising the temperature of a secondary battery (10) comprises a ripple generator (20) and a controller (30). The ripple generator (20), which is connected to the secondary battery (10), is adapted to actively cause the secondary battery (10) to generate a ripple current (I) having a predetermined frequency. The controller (30) controls the ripple generator (20) to cause the secondary battery (10) to generate the ripple current (I), thereby raising the temperature of the secondary battery. Herein, the predetermined frequency is set, based on the frequency characteristic of the impedance of the secondary battery (10), to a frequency in a frequency range in which the absolute value of the impedance relatively decreases.

Description

Technical field [0001] The present invention relates to a temperature-raising device for a secondary battery and a vehicle including the temperature-raising device, and in particular to a technology for raising the temperature of the secondary battery using heat generated by the internal resistance of the secondary battery. Background technique [0002] Generally, secondary batteries represented by lithium-ion batteries have lower charge and discharge characteristics when the temperature drops. For example, in a lithium ion battery, when charging at a low temperature, lithium (Li) is precipitated in the negative electrode. As a result, it causes performance degradation such as a decrease in battery capacity. Here, when the temperature of the battery is low, there is a need to quickly raise the temperature of the battery. [0003] Japanese Patent Laid-Open No. 11-329516 (Patent Document 1) discloses a battery heating device. In this heating device, a series circuit including an in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/50B60L11/18
CPCY02E60/12H01M10/5006H01M10/5026H01M10/5081H01M10/5008Y02T10/7005H01M10/5016H01M2220/20Y02T10/7011H02M3/158B60L11/1851Y02T10/705B60L11/1875B60L58/10B60L58/27H01M10/615H01M10/625H01M10/637H01M10/657H01M10/613Y02E60/10Y02T10/70H01M10/425H01M2200/10H01M50/578H01M50/581
Inventor 西勇二高桥秀典田泽正俊松坂正宣石仓诚
Owner TOYOTA JIDOSHA KK
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