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Battery safety evaluation device and battery safety evaluation method

A technology for safety evaluation and battery characteristics, applied in battery/fuel cell control devices, secondary battery charging/discharging, batteries, etc., can solve problems such as fluctuations

Active Publication Date: 2021-08-10
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these values ​​fluctuate as the battery cell deteriorates

Method used

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  • Battery safety evaluation device and battery safety evaluation method
  • Battery safety evaluation device and battery safety evaluation method
  • Battery safety evaluation device and battery safety evaluation method

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0028] figure 1 It is a block diagram showing an example of a schematic configuration of a power storage system including the battery safety evaluation device according to the first embodiment. This power storage system includes a storage battery 1 (first battery) and a battery safety evaluation device 2 . The battery safety evaluation device 2 includes a charge and discharge control unit 21, a measurement unit 22, an SOC (State of Charge: State of Charge) estimation unit 23, a storage unit 24, a battery characteristic estimation unit 25, an internal resistance correction unit 26, a battery safety An evaluation unit 27 and an output unit 28 . The battery characteristic estimation unit 25 includes a charge and discharge history recording unit 251 , an internal state parameter calculation unit 252 , and a battery characteristic calculation unit 253 . The battery safety evaluation unit 27 includes a thermal stability data storage unit 271, a thermal stability data acquisition u...

no. 2 Embodiment approach

[0180] The battery safety evaluation device 2 of the second embodiment not only outputs the determined safety evaluation to an external device or the like, but also changes the control related to charging and discharging of the storage battery 1 based on the determined safety evaluation.

[0181] Figure 12 It is a block diagram showing an example of a schematic configuration of the power storage system according to the second embodiment. The second embodiment differs from the first embodiment in that the battery safety evaluation device 2 further includes a use condition calculation unit 29 . Description of the same points as those of the first embodiment will be omitted.

[0182] The charge and discharge control unit 21 performs charge and discharge control for not only evaluating the safety of the storage battery 1 but also for using the storage battery 1 . In addition, the charge and discharge control unit 21 changes the control of charge and discharge based on the safet...

no. 3 Embodiment approach

[0190] In the previous embodiment, the thermal stability data acquisition unit 272 acquires the thermal stability data corresponding to the storage battery 1 from the thermal stability data stored in the thermal stability data storage unit 271 . However, since the state of the storage battery 1 involves many aspects, if all the thermal stability data is stored in the thermal stability data storage unit 271, the capacity of the thermal stability data storage unit 271 will be huge. In addition, there may be a case where the thermal stability data corresponding to the storage battery 1 does not exist in the thermal stability data storage unit 271 . Therefore, in the third embodiment, acquisition and update of thermal stability data are performed from the outside. Accordingly, the amount of thermal stability data stored in the thermal stability data storage unit 271 can be reduced, and the size of the battery safety evaluation unit 27 and the cost reduction related to the producti...

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Abstract

Embodiments of the present invention relate to a battery safety evaluation device and a battery safety evaluation method. One embodiment of the present invention evaluates the safety of a secondary battery by a non-destructive method. The battery safety evaluation device of the present embodiment includes a battery characteristic estimation unit, a calorific value estimation unit, and a battery cell attainable temperature estimation unit. The battery characteristic estimating unit estimates estimated values ​​of internal state parameters of the first battery based on voltage and current data of the first battery measured during charging or discharging of the first battery as a secondary battery to be evaluated. The calorific value estimating unit estimates the first temperature when the external temperature fluctuates based on the reference data showing at least the relationship between the calorific value of the secondary battery and the external temperature, and based on the first reference data whose estimated value corresponds to the first battery. The heat generated by the battery. The safety index calculation unit calculates a safety index related to the temperature of the first battery when the external temperature fluctuates based on the calorific value of the first battery.

Description

[0001] This application is based on Japanese Patent Application No. 2017-050332 (filing date: March 15, 2017), and priority is claimed based on this application. This application incorporates the entire contents of this application by reference thereto. technical field [0002] Embodiments of the present invention relate to a battery safety evaluation device and a battery safety evaluation method. Background technique [0003] Non-aqueous electrolyte secondary batteries such as lithium ion batteries are known to have high energy density and are widely used as constituent batteries (unit cells or battery cells) of battery packs. For example, a notebook PC uses a battery pack consisting of several battery cells, an electric vehicle uses a battery pack consisting of tens to hundreds of battery cells, and a power system uses a battery pack consisting of more than 10,000 cells. A battery pack composed of battery cells. [0004] On the other hand, it is also known that non-aqueo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/382G01R31/396
CPCG01R31/3648H01M10/488H01M10/482H01M10/486H01M10/4207H01M2200/00H01M10/635G01R31/392G01R31/367G01R31/396Y02E60/10Y02T10/70G06F17/18H01M10/441G01R31/3842G01F1/00G01F3/00B60L1/003H01M6/50G01N27/27H01M10/18H01M10/443B60L58/14H01M10/44G01R31/382
Inventor 森田朋和藤田有美杉山畅克石井惠奈荒谷涉
Owner KK TOSHIBA
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