Abstract: A curved battery cell may include (1) a positive terminal, (2) a negative terminal, (3) one or more curved electrodes, and (4) an outer case encasing the one or more curved electrodes that includes at least one curved surface having a non-uniform radius of curvature. A curved battery pack may include (1) a first curved battery cell with a first outer surface having a first non-uniform curvature and (2) a second curved battery cell with a second outer surface having a second non-uniform curvature. Various other apparatus, systems, and methods are also disclosed.

Abstract: For electronic devices that have an electrically conductive surface across a gap from a battery enclosure, the described circuit may be used to detect an anomalous event. The circuit may connect the battery enclosure to ground and may include a switch that operably connects the electrically conductive surface to ground or, upon actuation of the switch, to a portion of the circuit including a resistor. In an anomaly detection mode, the switch is controlled to disconnect the surface from ground and to connect the surface to a resistance measurement channel and a resistor that is connected to the sub-circuit and ground. The system may determine an impedance across the resistor and may use the measured impedance to detect and/or classify an anomalous event.

Abstract: The disclosed adjustable strap apparatus may include a left strap having a first rack member and a right strap having a second rack member. An electrical unit may have an opening through which a shaft passes. A pinion member may be affixed to a proximal end of the shaft and may be adapted to (a) engage the first rack member and the second rack member and (b) translate the first rack member and the second rack member in opposite directions via rotation of the shaft. A ratcheting member may be coupled to a distal end of the shaft and may include one or more pawls adapted to prevent rotation of the shaft when engaged. Various other methods, systems, and devices are also disclosed.

Abstract: A curved battery cell may include (1) a positive terminal, (2) a negative terminal, (3) one or more curved electrodes, and (4) an outer case encasing the one or more curved electrodes that includes at least one curved surface having a non-uniform radius of curvature. A curved battery pack may include (1) a first curved battery cell with a first outer surface having a first non-uniform curvature and (2) a second curved battery cell with a second outer surface having a second non-uniform curvature. Various other apparatus, systems, and methods are also disclosed.

Abstract: A flexible battery comprising (1) at least one positively charged layer, (2) at least one negatively charged layer, (3) a coated electrode segment that includes a segment of the positively charged layer and a segment of the negatively charged layer, and (4) an additional coated electrode segment movably coupled to the coated electrode segment, wherein the additional coated electrode segment includes an additional segment of the positively charged layer and an additional segment of the negatively charged layer. Various other apparatuses, devices, systems, and methods are also disclosed.

Abstract: The disclosed adjustable strap apparatus may include a left strap having a first rack member and a right strap having a second rack member. An electrical unit may have an opening through which a shaft passes. A pinion member may be affixed to a proximal end of the shaft and may be adapted to (a) engage the first rack member and the second rack member and (b) translate the first rack member and the second rack member in opposite directions via rotation of the shaft. A ratcheting member may be coupled to a distal end of the shaft and may include one or more pawls adapted to prevent rotation of the shaft when engaged. Various other methods, systems, and devices are also disclosed.

Abstract: A non-cuboidal battery having a cross-sectional area and a thickness may include a metal can housing, a metal lid coupled to the metal can housing, and an electrode stack disposed in the metal can housing. The thickness of the non-cuboidal battery can be substantially uniform over the cross-sectional area. The electrode stack may include a cathode layer stacked on an anode layer, and a separator layer disposed between the cathode layer and the anode layer. The electrode stack may be hermetically sealed by the metal can housing and the metal lid. A negative terminal that can be electrically coupled to the anode layer and a positive terminal that can be electrically coupled to the cathode layer may be disposed on an exterior side of the metal can housing or the metal lid.

Abstract: An apparatus may include a power rail, a subassembly, an additional subassembly, and an interface coupling the subassembly to the additional subassembly. The subassembly may include a load, an energy-storing component, a charger having an output coupled to the energy-storing component, and a reverse-current limiter having a first terminal coupled to the energy-storing component. The additional subassembly may include an additional energy-storing component, an additional charger having an output coupled to the additional energy-storing component, and an additional reverse-current limiter having a first terminal coupled to the additional energy-storing component. The power rail may cross the interface and may couple the load, an input of the charger, a second terminal of the reverse-current limiter, an input of the additional charger, and a second terminal of the additional reverse-current limiter. Various other apparatuses, systems, and methods are also disclosed.

Abstract: A battery system includes a plurality of battery cells connected in parallel. Each battery cell includes a pair of positive and negative tabs extending from each of two opposing sides. The battery system also includes one or more pairs of adjacent joining pads, each pair connecting the positive and negative tabs of adjacent battery cells. The battery system also includes a terrace portion. The positive tab and the negative tab corresponding to one side of a battery cell at one end of the parallel connection extend out onto the terrace portion. A pair of bus-bars placed in the terrace portion allow the extension of the tabs. Each joining pad is made of a flexible material so as to allow the positive and negative tabs of adjacent battery cells to bend around the respective joining pad. The battery system can be configured in various shapes, such as curved.

Abstract: A curved battery pack may include (1) a housing comprising a curved surface and (2) a curved battery shaped to conform to the curved surface. The curved battery may be positioned relative to the curved surface such that the curved surface applies a force that counteracts a flattening force experienced by the curved battery. Various other apparatus, systems, and methods are also disclosed.

Abstract: The disclosed computer-implemented method may include (i) detecting a battery condition of a wearable battery-operated device that indicates a threat to a battery's health and (ii) in response to detecting the battery condition, performing a battery-protection action by initiating a reverse power flow across a bidirectional connection from the wearable battery-operated device to a portable charging case that is designed to charge the wearable battery-operated device. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: A wearable battery-pack accessory may include (1) one or more curved batteries, (2) charging circuitry that charges the one or more curved batteries, (3) supplying circuitry that supplies power to a connected external computing device, and (4) an outer housing including a curved surface shaped to conform to a portion of a wearer's body. A head-mounted display system may include (1) a head-mounted display, (2) a strap that is coupled to the head-mounted display and wraps around the back of a user's head when the user is wearing the head-mounted display, and (3) a battery-pack accessory detachably coupled to the strap. Various other apparatus, systems, and methods are also disclosed.

Abstract: A battery system includes a plurality of battery cells connected in parallel. Each battery cell includes a positive and negative tab. The battery system also includes a plurality of thermal switch devices (e.g., temperature cut off (TCO) or positive temperature coefficient (PTC) devices). Each thermal switch device is electrically coupled to a respective cell. The battery system further includes a rigid-flex circuit board comprising a plurality of rigid regions. Each rigid region is physically and electrically connected to an adjacent rigid region by a respective flexible region. Each rigid region is electrically coupled to respective positive and negative tabs of a respective battery cell. Each thermal switch device prevents abnormal current flow (e.g., by limiting the flow of current at high temperatures) between a first battery cell that is coupled to the thermal switch device and a second battery cell that is adjacent to the first battery cell.

Abstract: An artificial-reality headset assembly includes an artificial-reality headset, a battery pack, and a plurality of head straps. One end of each of the head straps is coupled to the artificial-reality headset and the respective opposite end is coupled to the battery pack. The plurality of head straps includes one or more side straps configured to be worn around a user's head. The battery pack is located in proximity to a posterior portion of the user's head when the artificial-reality headset is worn. The position and weight of the battery pack function to counterbalance weight of the artificial-reality headset, creating a symmetric balance along an axis of the user's head and maintaining the position of the battery pack regardless of adjustment to the one or more side straps. In some embodiments, the plurality of head straps includes an overhead strap (e.g., an adjustable ergonomic strap).

Abstract: An apparatus may include a power rail, a subassembly, an additional subassembly, and an interface coupling the subassembly to the additional subassembly. The subassembly may include a load, an energy-storing component, a charger having an output coupled to the energy-storing component, and a reverse-current limiter having a first terminal coupled to the energy-storing component. The additional subassembly may include an additional energy-storing component, an additional charger having an output coupled to the additional energy-storing component, and an additional reverse-current limiter having a first terminal coupled to the additional energy-storing component. The power rail may cross the interface and may couple the load, an input of the charger, a second terminal of the reverse-current limiter, an input of the additional charger, and a second terminal of the additional reverse-current limiter. Various other apparatuses, systems, and methods are also disclosed.

Abstract: The disclosed adjustable strap apparatus may include a left strap having a first rack member and a right strap having a second rack member. An electrical unit may have an opening through which a shaft passes. A pinion member may be affixed to a proximal end of the shaft and may be adapted to (a) engage the first rack member and the second rack member and (b) translate the first rack member and the second rack member in opposite directions via rotation of the shaft. A ratcheting member may be coupled to a distal end of the shaft and may include one or more pawls adapted to prevent rotation of the shaft when engaged. Various other methods, systems, and devices are also disclosed.

Abstract: An apparatus may include a power rail, a subassembly, an additional subassembly, and an interface coupling the subassembly to the additional subassembly. The subassembly may include a load, an energy-storing component, a charger having an output coupled to the energy-storing component, and a reverse-current limiter having a first terminal coupled to the energy-storing component. The additional subassembly may include an additional energy-storing component, an additional charger having an output coupled to the additional energy-storing component, and an additional reverse-current limiter having a first terminal coupled to the additional energy-storing component. The power rail may cross the interface and may couple the load, an input of the charger, a second terminal of the reverse-current limiter, an input of the additional charger, and a second terminal of the additional reverse-current limiter. Various other apparatuses, systems, and methods are also disclosed.

Abstract: An apparatus for monitoring battery swelling includes a conductive layer adhered to a battery pack, a surface opposite the battery pack, a flex layer adhered to the bottom of the surface, and a resistance measurement circuit. The conductive layer includes one or more conductive strips. The flex layer includes a resistive pattern with one or more serially connected resistive segments. Each resistive segment is aligned to a respective conductive strip. The surface is positioned over the battery pack so that initially the resistive pattern is not in contact with and is electrically separated from the conductive layer. The resistance measurement circuit is connected to the resistive pattern to detect changes in resistance of the resistive pattern. When the battery pack swells, the resistive pattern comes in contact with the conductive layer, thereby shorting a resistive segment, and causes the resistance measurement circuit to detect the change in the resistance.

Abstract: A battery system includes a plurality of battery cells connected in parallel. Each battery cell includes a positive and negative tab. The battery system also includes a plurality of thermal switch devices (e.g., temperature cut off (TCO) or positive temperature coefficient (PTC) devices). Each thermal switch device is electrically coupled to a respective cell. The battery system further includes a rigid-flex circuit board comprising a plurality of rigid regions. Each rigid region is physically and electrically connected to an adjacent rigid region by a respective flexible region. Each rigid region is electrically coupled to respective positive and negative tabs of a respective battery cell. Each thermal switch device prevents abnormal current flow (e.g., by limiting the flow of current at high temperatures) between a first battery cell that is coupled to the thermal switch device and a second battery cell that is adjacent to the first battery cell.

Abstract: An apparatus may include a power rail, a subassembly, an additional subassembly, and an interface coupling the subassembly to the additional subassembly. The subassembly may include a load, an energy-storing component, a charger having an output coupled to the energy-storing component, and a reverse-current limiter having a first terminal coupled to the energy-storing component. The additional subassembly may include an additional energy-storing component, an additional charger having an output coupled to the additional energy-storing component, and an additional reverse-current limiter having a first terminal coupled to the additional energy-storing component. The power rail may cross the interface and may couple the load, an input of the charger, a second terminal of the reverse-current limiter, an input of the additional charger, and a second terminal of the additional reverse-current limiter. Various other apparatuses, systems, and methods are also disclosed.