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：US20220140627A1

公开(公告)日：2022-05-05

申请号：US17084517

申请日：2020-10-29

Applicant: GOOGLE LLC

Inventor： David Wang ,  James Robert Lim ,  Chang Hong Ye ,  Arun Prakash Raghupathy

IPC: H02J7/00

Abstract: A battery provisioning method is implemented by an outdoor electronic device having a rechargeable battery. The electronic device obtains geolocation information of a geographic location where the electronic device is located. The electronic device further obtains outdoor temperature information of the geographic location based on the geolocation information. A battery setting of the rechargeable battery is determined based on the outdoor temperature information, and used to provision the rechargeable battery of this electronic device. In some implementations, the rechargeable battery is provisioned with an upper limit for a state of charge at each time of installing and initializing the electronic device. During normal operation, the rechargeable battery of the electronic device is charged up to the upper limit for the state of charge, while the upper limit for the state of charge of the rechargeable battery may be updated periodically or upon request.

公开(公告)号：US20220099749A1

公开(公告)日：2022-03-31

申请号：US17032668

申请日：2020-09-25

Applicant: Google LLC

Inventor： David Wang ,  Lauren Francine Chanen ,  James Robert Lim ,  Pak Heng Lau

IPC: G01R31/392 ,  G01R31/389 ,  G01R31/36 ,  H01M10/48 ,  G01L9/00

Abstract: A method for monitoring battery degradation including receiving, from a pressure sensor, a first pressure value associated with a battery pack, comparing the first pressure reading to a first pressure threshold value and if the first pressure reading is greater than the first pressure threshold value, applying a first battery discharge pulse to the battery pack. The method further includes calculating a first internal resistance value of the battery pack in response to the first battery discharge pulse, comparing the first internal resistance value to an initial internal resistance value, and transmitting an alert to an electronic device if the first internal resistance value exceeds the initial internal resistance value.

公开(公告)号：US20210376625A1

公开(公告)日：2021-12-02

申请号：US17222230

申请日：2021-04-05

Applicant: Google LLC

Inventor： James Robert Lim ,  David Wang ,  Bonnie Yip ,  Haoxing Zhang

IPC: H02J7/00 ,  H01M10/42 ,  H02H7/18

Abstract: This application is directed to a battery protection system including a sense resistor, a comparator, a switching component, and a protection integrated circuit (PIC). The sense resistor is electrically coupled in series with one of a plurality of rechargeable battery cells that are coupled in parallel in a battery. The comparator is coupled to the sense resistor and configured to compare a voltage drop across the sense resistor with a reference voltage to determine whether a subset of the rechargeable battery cells is not charging in the battery. The switching component is coupled to the battery, while the PIC is coupled to the comparator and the switching component. The PIC is configured to control charging and discharging of the battery including disabling the battery from being charged in accordance with a determination that a subset of the rechargeable battery cells is not charging in the battery.