{
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  "description": "A battery management device includes: an acquisition unit that acquires a degradation evaluation value for evaluating a degree of advance of a high-rate degradation state of a lithium-ion secondary battery; a high-frequency signal supply unit that supplies a high-frequency signal at a frequency of…",
  "path": "/patents/1423527",
  "publishedAt": "2026-06-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M10/425",
    "TOYOTA JIDOSHA KABUSHIKI KAISHA"
  ],
  "textContent": "A battery management device includes: an acquisition unit that acquires a degradation evaluation value for evaluating a degree of advance of a high-rate degradation state of a lithium-ion secondary battery; a high-frequency signal supply unit that supplies a high-frequency signal at a frequency of 0.1 MHz or higher to the lithium-ion secondary battery; a detection unit that detects a value of a real part of alternating current impedance from the lithium-ion secondary battery supplied with the high-frequency signal; a calculation unit that calculates an amount of Li deposition in the lithium-ion secondary battery from the detected value of the real part of the alternating current impedance; and a control unit that, as the calculated amount of Li deposition increases, reduces an upper-limit degradation evaluation value for the lithium-ion secondary battery that is a criterion for determining whether the lithium-ion secondary battery is expected to reach the high-rate degradation state.",
  "title": "BATTERY MANAGEMENT DEVICE"
}