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.

公开(公告)号：US11668756B2

公开(公告)日：2023-06-06

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 ,  G01L9/00 ,  H01M10/48 ,  G01R31/389 ,  G01R31/36

CPC classification number: G01R31/392 ,  G01L9/0002 ,  G01R31/3644 ,  G01R31/389 ,  H01M10/48

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：US20230066939A1

公开(公告)日：2023-03-02

申请号：US18047521

申请日：2022-10-18

Applicant: Google LLC

Inventor： James Robert Lim ,  Haoxing Zhang ,  David Wang ,  Dietrich Shing-Quan Ho ,  Yuanyuan Song

IPC: H02J7/00

Abstract: This application is directed to an electronic device powered by one or more rechargeable battery cells. The electronic device includes a first negative temperature coefficient (NTC) thermistor proximate to the battery cells, and an open capacitor coupled in parallel with the NTC thermistor. The open capacitor has an open area and two electrodes that are at least partially exposed via the open area and electrically isolated. The electronic device further includes a control circuit coupled to the NTC thermistor and the open capacitor. The control circuit is configured to detect a voltage drop across the NTC thermistor and the open capacitor if conductive liquid enters the open area of the capacitor and electrically connects the two electrodes that are at least partially exposed via the open area.

公开(公告)号：US20240353361A1

公开(公告)日：2024-10-24

申请号：US18758223

申请日：2024-06-28

Applicant: Google LLC

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

IPC: G01N25/72 ,  G01R31/371 ,  G01R31/392 ,  H01M10/615 ,  H01M10/63

CPC classification number: G01N25/72 ,  G01R31/371 ,  G01R31/392 ,  H01M10/615 ,  H01M10/63

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.

公开(公告)号：US12057592B2

公开(公告)日：2024-08-06

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: H01M50/209 ,  H01M50/105 ,  H01M50/138

CPC classification number: H01M50/209 ,  H01M50/105 ,  H01M50/138

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：US20230335824A1

公开(公告)日：2023-10-19

申请号：US18044035

申请日：2021-09-02

Applicant: Google LLC

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

IPC: H01M10/6571 ,  H01M50/519 ,  H01M10/655 ,  H01M50/24 ,  H01M10/615 ,  H01M10/48 ,  H01M10/637 ,  H01M10/627 ,  H01M50/509

CPC classification number: H01M10/627 ,  H01M10/486 ,  H01M10/615 ,  H01M10/637 ,  H01M10/655 ,  H01M10/6571 ,  H01M50/24 ,  H01M50/509 ,  H01M50/519 ,  H01M2220/10

Abstract: This application is directed to a battery having a heating element. A connector of the battery includes a first terminal, a second terminal, and a heater terminal. One or more rechargeable battery cells are electrically coupled to the first and second terminals of the connector. The heating element is in contact with a subset of the battery cells, and includes a resistive heater path that is electrically coupled to the first and heater terminals of the connector and generates heat to warm the battery when a heater voltage is applied to the heater terminal. A waterproof material is wrapped around an exterior of the heating element and battery cells and prevents ambient water from contacting the heater element and battery cells. The waterproof material includes an opening to allow at least the first and second terminals of the connector to be electrically coupled to a logic board.

公开(公告)号：US11482872B2

公开(公告)日：2022-10-25

申请号：US17144807

申请日：2021-01-08

Applicant: Google LLC

Inventor： James Robert Lim ,  Haoxing Zhang ,  David Wang ,  Dietrich Shing-Quan Ho ,  Yuanyuan Song

IPC: H02J7/00

Abstract: This application is directed to an electronic device powered by one or more rechargeable battery cells. The electronic device includes a first negative temperature coefficient (NTC) thermistor proximate to the battery cells, and an open capacitor coupled in parallel with the NTC thermistor. The open capacitor has an open area and two electrodes that are at least partially exposed via the open area and electrically isolated. The electronic device further includes a control circuit coupled to the NTC thermistor and the open capacitor. The control circuit is configured to detect a voltage drop across the NTC thermistor and the open capacitor if conductive liquid enters the open area of the capacitor and electrically connects the two electrodes that are at least partially exposed via the open area.

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：US20240313268A1

公开(公告)日：2024-09-19

申请号：US18122878

申请日：2023-03-17

Applicant: Google LLC

Inventor： James Robert Lim ,  Shang Shi ,  Haoxing Zhang ,  Kelly Jitsuo Tsudama

IPC: H01M10/42 ,  G01R31/36 ,  G06F1/16

CPC classification number: H01M10/4221 ,  G01R31/3646 ,  G06F1/1635

Abstract: The present document describes techniques associated with right-to-repair battery-replacement methodologies and applications thereof. These techniques include detecting a replacement battery in an electronic device (a new battery or the same battery reinstalled), authenticating the replacement battery, and monitoring battery characterization and health of the replacement battery. Using these techniques fulfills sustainability and right-to-repair options, aligning with customer rights and government regulations. Further, these techniques enable replacement of an embedded battery in a user's device and detection that the replacement battery was installed and is safe for use by the device. A battery health monitor may be implemented on the device to monitor the health of the replacement battery. In some aspects, the battery health monitor may be a subscription-based service implemented via an application executed on the device or via a system-level application.

公开(公告)号：US11961976B2

公开(公告)日：2024-04-16

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

CPC classification number: H01M10/425 ,  H01M10/482 ,  H01M10/486 ,  H01M2010/4271

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.