公开(公告)号：US20230246470A1

公开(公告)日：2023-08-03

申请号：US18159553

申请日：2023-01-25

Applicant: Google LLC

Inventor： James Robert Lim ,  David Wang ,  Haoxing Zhang ,  Shang Shi

IPC: H02J7/00 ,  G01R19/165 ,  G01R31/3835

CPC classification number: H02J7/007182 ,  H02J7/0029 ,  G01R19/16542 ,  G01R31/3835

Abstract: The present document describes battery zero-voltage (0V) detection methodologies and applications thereof. These techniques detect the occurrence of the 0V condition and enable the device to continue operation after one 0V condition. These techniques may, however, shut down the device after detecting a second occurrence of the 0V condition of the battery. In an aspect, a combination of hardware and software is used at a system side of a device, when the device is connected to an external power source, to detect a 0V condition and/or distinguish the 0V condition from an undervoltage-protection (UVP) condition.

公开(公告)号：US11637434B2

公开(公告)日：2023-04-25

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.

公开(公告)号：US20220285741A1

公开(公告)日：2022-09-08

申请号：US17194480

申请日：2021-03-08

Applicant: Google LLC

Inventor： James Robert Lim ,  Wei Li ,  Brian Conner ,  Brett Wilson

IPC: H01M10/42 ,  H01M10/48

Abstract: An example outdoor mounted device includes a first battery configured to operate at a low temperature range that at least includes negative 20 Celsius; a second battery configured to operate at a high temperature range; a temperature sensor; and processing circuitry configured to: determine, based on data received from the temperature sensors, a current temperature; responsive to determining that the current temperature is within the low temperature range, cause one or more components of the computing device to operate using electrical energy sourced from the first battery; and responsive to determining that the current temperature is within the high temperature range, cause the one or more components of the computing device to operate using electrical energy sourced from the second battery.

公开(公告)号：US20220102691A1

公开(公告)日：2022-03-31

申请号：US17032685

申请日：2020-09-25

Applicant: Google LLC

Inventor： David Wang ,  Lauren Francine Chanen ,  James Robert Lim ,  Neha Ravi Dixit ,  Alexander P. Wroblewski

IPC: H01M2/10 ,  H01M2/02

Abstract: A battery pack includes a battery, an outer enclosure housing the battery to form a battery pack, and an expandable portion extending from the outer enclosure and allowing the battery pack to expand along an X-axis of the battery pack. The expandable portion includes an inner portion, an outer portion, and a gap portion between the inner portion and the outer portion. The inner portion and the outer portion have a sealing layer to seal off an interior space and the gap portion is devoid of the sealing layer. The sealing layer allows for fluid communication between the gap portion and the interior space when a pressure exerted on the sealing layer exceeds a pressure threshold. The expandable portion includes folds allowing the expandable portion to fold toward the battery pack in an initial folded configuration and expand away from the battery pack in an at least partially unfolded configuration.

公开(公告)号：US20220099606A1

公开(公告)日：2022-03-31

申请号：US17032679

申请日：2020-09-25

Applicant: Google LLC

Inventor： David Wang ,  Arun Raghupathy ,  James Robert Lim ,  Ihab A. Ali ,  Chang Hong Ye

IPC: G01N25/72 ,  G01R31/392 ,  G01R31/371

Abstract: A battery pack includes a battery, a first temperature sensor configured to provide a first temperature value associated with a temperature of the battery, a heat source disposed proximate to the battery and configured to heat the battery, a second temperature sensor configured to provide a second temperature value associated with a temperature of the heat source, and a control board coupled to the first temperature sensor and the second temperature sensor, wherein the control board is configured to receive the first temperature value and the second temperature value. The control board is configured to compare the first temperature value and the second temperature value to determine a temperature gradient between the battery and the heat source and transmit an alert if the temperature gradient exceeds a first temperature gradient threshold.