公开(公告)号：US12149106B2

公开(公告)日：2024-11-19

申请号：US18405408

申请日：2024-01-05

Applicant: Google LLC

Inventor： Michael Jonathon Chen ,  William Alan Saperstein ,  James Robert Lim ,  David Wang

IPC: H01M10/44 ,  H01M10/46 ,  H02J7/00

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

公开(公告)号：US11901751B2

公开(公告)日：2024-02-13

申请号：US17319815

申请日：2021-05-13

Applicant: Google LLC

Inventor： Michael Jonathon Chen ,  William Alan Saperstein ,  James Robert Lim ,  David Wang

IPC: H01M10/44 ,  H01M10/46 ,  H02J7/00

CPC classification number: H02J7/00308 ,  H02J7/0031 ,  H02J7/00302 ,  H02J7/007182

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

公开(公告)号：US20220285957A1

公开(公告)日：2022-09-08

申请号：US17195305

申请日：2021-03-08

Applicant: Google LLC

Inventor： James Robert Lim ,  Michael Jonathon Chen ,  Mitchell Aaron Jones ,  William Alan Saperstein ,  David Wang

IPC: H02J7/00

Abstract: Techniques to detect faults in a battery with at least two parallel battery cells. In some examples, a cell may fail or become disconnected. The circuitry of this disclosure may determine whether a battery pack has a fault by measuring battery parameters at the positive and negative terminals. When the circuitry detects a fault, the circuitry may adjust the charge rate so that the charge does not exceed the maximum charge rate of any single cell of the battery pack. In some examples, the circuitry may shut off the charge current to the battery pack to ensure that the charge rate does not exceed the maximum charge rate of any single cell. To avoid false positive fault detection, the circuitry of this disclosure may verify the detected fault and the parameters of the charging cycle before reducing the charging current.

公开(公告)号：US20220239134A1

公开(公告)日：2022-07-28

申请号：US17319815

申请日：2021-05-13

Applicant: Google LLC

Inventor： Michael Jonathon Chen ,  William Alan Saperstein ,  James Robert Lim ,  David Wang

IPC: H02J7/00

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.

公开(公告)号：US20240154435A1

公开(公告)日：2024-05-09

申请号：US18405408

申请日：2024-01-05

Applicant: Google LLC

Inventor： Michael Jonathon Chen ,  William Alan Saperstein ,  James Robert Lim ,  David Wang

IPC: H02J7/00

CPC classification number: H02J7/00308 ,  H02J7/00302 ,  H02J7/0031 ,  H02J7/007182

Abstract: An indexed sequence of bits in a buffer is allocated for tracking a battery charging state. The indexed sequence of bits has a first number of bits. A battery voltage of a rechargeable battery is sampled at a sampling rate. For each sampled battery voltage, the battery voltage is compared with a voltage threshold. A next bit position in the indexed sequence of bits is identified. In accordance with a determination that a comparison result is true, a predefined first value is added to the next bit position. A second number of bits that are filled with the predefined first value is determined. A ratio between the second number and the first number is also determined. In accordance with a determination that the ratio exceeds a threshold step-down ratio, a battery charge voltage is stepped down. The rechargeable battery is charged to a step-down voltage.