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Secondary battery internal state estimating apparatus and secondary battery internal state estimating method

A secondary battery and internal state technology, applied to secondary batteries, measuring devices, lithium batteries, etc., can solve the problem of not being able to estimate the internal state of secondary batteries with high precision

Inactive Publication Date: 2009-08-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, there is a problem that the internal state of the secondary battery cannot be estimated with high precision in the conventional estimation method

Method used

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  • Secondary battery internal state estimating apparatus and secondary battery internal state estimating method
  • Secondary battery internal state estimating apparatus and secondary battery internal state estimating method
  • Secondary battery internal state estimating apparatus and secondary battery internal state estimating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050] figure 1 It is a schematic block diagram for explaining a configuration example of a power supply system including an internal state estimation device for a secondary battery and a power supply system for the secondary battery according to an embodiment of the present invention.

[0051] refer to figure 1 , the power supply system 5 includes: a secondary battery 10 , a load 20 , a cooling fan 40 for the secondary battery, and an electronic control unit (ECU: Electronic Control Unit) 50 .

[0052] A lithium ion battery is used as a representative example of the chargeable and dischargeable secondary battery 10 . Lithium ion batteries are suitable for applying the present invention because their output characteristics change with changes in the distribution state of the lithium ion concentration inside the battery.

[0053] The secondary battery 10 is provided with: a temperature sensor 30 for measuring the battery temperature Tb; a current sensor 32 for measuring the...

Embodiment approach 2

[0117] In Embodiment 2, not only the parameter value is updated based on the usage state of the secondary battery, but also the deterioration state of the secondary battery is estimated based on the updated parameter value.

[0118] Figure 7 is a functional block diagram of the internal state estimation device of the secondary battery according to the second embodiment.

[0119] refer to Figure 7 , the internal state estimation device of the secondary battery according to Embodiment 2 includes the voltage sensor 34 and the ECU 50 .

[0120] ECU 50 includes a battery model unit 60 , a parameter generation unit 62 , and a comparison unit 75 . The parameter generation unit 62 includes a parameter identification unit 65 and a parameter management unit 80 .

[0121] The ECU 50 also includes a degradation characteristic storage section 82 and a degradation estimation section 84 .

[0122] The degradation characteristic storage unit 82 stores in advance standard degradation cha...

Embodiment approach 3

[0133] In Embodiment 3, not only the parameter values ​​are updated, but also the updated parameter values ​​are compared with the parameter values ​​on the degradation curve. Furthermore, in Embodiment 3, the comparison result is also displayed. Thereby, the user of the secondary battery can grasp whether or not the degree of deterioration of the secondary battery is deeper than usual.

[0134] Figure 10 is a configuration diagram of a power supply system including an internal state estimation device for a secondary battery according to Embodiment 3.

[0135] refer to Figure 10 , the power supply system 5 includes a secondary battery 10 , a load 20 , a cooling fan 40 for the secondary battery, an ECU 50 , and a display unit 90 . The display unit 90 receives information on the internal state of the secondary battery from the ECU 50 and displays the information.

[0136] Figure 11 It is a functional block diagram of the internal state estimation device of the secondary ...

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Abstract

By using a battery model capable of estimating the internal reaction of a secondary battery (10) based on a parameter value, a battery model portion (60) provides the battery model with the parameter value obtained from a parameter generating portion (62) and estimates the internal state of the secondary battery (10). The parameter generating portion (62) generates the parameter value including a material property value of the secondary battery (10), based on information indicating a usage state of the secondary battery (10). The battery model is updated by updating the parameter value. This reduces a difference between the actual internal state of the secondary battery and the internal state of the secondary battery estimated by the battery model.

Description

technical field [0001] The present invention relates to a device for estimating the internal state of a secondary battery and a method for estimating the internal state of the secondary battery. More specifically, the present invention relates to a device and method for estimating an internal state of a secondary battery from a battery model. Background technique [0002] Various methods for estimating the state of the secondary battery have been proposed so far. For example, Japanese Patent Laid-Open No. 2003-346919 discloses a method of estimating the state of charge (SOC: State of Charge) of a secondary battery. According to this method, first, the ion concentration distribution in the active material forming the lithium ion battery is calculated based on the value of the current flowing into the storage battery. Next, the open circuit voltage of the power storage device is calculated based on the calculated ion concentration distribution. Then, the SOC is estimated ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3651G01R31/3662G01R31/367G01R31/389Y02E60/10H01M10/48G01R31/392H01M10/052
Inventor 西勇二
Owner TOYOTA JIDOSHA KK