Method for leak testing a finished battery cell using a leak test system comprising a vacuum chamber and a detecting and measuring instrument, the method including positioning the cell in the vacuum chamber, sealing the vacuum chamber, starting a vacuum creation phase in which the pressure inside the vacuum chamber is decreased, starting a stabilization phase in which gases and/or vapors deriving from parts and/or substances inside the cell leak from the cell, starting an acceleration phase in which an auxiliary gas is fed into the vacuum chamber pushing the gases and/or vapors leaking from the cell towards the detecting and measuring instrument, and detecting the leak rate by means of the detecting and measuring instrument. In the acceleration phase the pressure inside the leak test system is raised, thereby increasing the flow of the gases and/or vapors leaking from the cell towards the detecting and measuring instrument.

A battery module according to an embodiment of the present invention includes a battery stack in which a plurality of battery cells including a cathode tab and an anode tab are stacked; a first bus bar assembly including a first bus bar connecting cathode tabs and anode tabs located at one end of the battery stack; and a second bus bar assembly including a second bus bar connecting cathode tabs and anode tabs located at the other end of the battery stack. The first bus bar assembly or the second bus bar assembly may include a venting part including at least one venting knife which protrudes from the first bus bar or the second bus bar toward the battery cell, such that stability of the battery module may be improved.

Provided is a system for predicting a vent occurrence time of a battery cell, which includes a terrace portion having a sealing portion and provided on at least one side of a pouch type battery case and an electrode lead protruding from an end of the terrace portion, the system including a storage unit for collecting data about vent occurrence times according to widths of a remaining sealing portion, a measurement unit for periodically measuring a width of a remaining sealing portion of the battery cell to be measured, and a determination unit for predicting a vent occurrence time of the battery case to be measured by comparing a measured width of the remaining sealing portion with the collected data.

A high-voltage battery for a motor vehicle includes a battery housing for receiving a plurality of battery modules in an interior space of the battery housing, and a detection device for detecting damage to the battery housing. The detection device includes at least one pressure sensor arranged in the interior space of the battery housing, which is configured to detect a pressure signal in the interior space of the battery housing, and an evaluation unit, which is configured to identify the damage to the battery housing based on the pressure signal detected by the pressure sensor. A method and a motor vehicle using the high-voltage battery are also provided.

A battery system, a method of detecting leaks inside a battery system, and a vehicle, the battery system including a housing including a housing frame and a base frame, the housing frame and the base frame enclosing a housing space; a battery module including a plurality of battery cells electrically connected to each other via a bus bar, the battery module being in the housing space; a tray including a tray frame and a tray base; and a battery management system including a liquid detector, wherein the liquid detector is configured to detect a liquid inside the tray, and the liquid detector includes a high-voltage conductor, a first end of the high-voltage conductor being connected to the bus bar and a second end of the high-voltage conductor being between the base frame and the tray base.

An electronic device includes a housing configured to form at least a portion of an outer surface of the electronic device; a battery disposed inside the housing; a circuit board disposed inside the housing; a gas sensor module including at least one gas sensor and mounted in the circuit board; and at least one wall disposed adjacent to the gas sensor module, wherein in the at least one wall, a first opening configured to introduce a gas leaked from the battery and a second opening configured to introduce air outside the electronic device are formed.

An electrical device includes a housing with a first external contact and a second external contact for supplying the electrical device with power. The electrical device has a first conductor, a second conductor, and an evaluation unit in the housing. The first conductor is electrically connected to a first contact for a first potential. The second conductor is electrically connected to a second contact for a second potential that is different from the first potential. The first conductor and the second conductor are electrically connected to the evaluation unit. The first conductor and the second conductor are configured such that an electrical connection between the first conductor and the second conductor, due to dirt or moisture in the housing, is detected by the evaluation unit.

A battery pack includes a controller, a battery core, a liquid leakage detector, and a pre-charge switch. The liquid leakage detector is connected with the controller, and the liquid leakage detector is configured to send a liquid leakage signal to the controller when detecting that liquid leakage occurs in the battery core. The controller is configured to prohibit sending a pre-charge on signal to the pre-charge switch upon receiving the liquid leakage signal while receiving a start signal for starting the battery core. The pre-charge switch is configured to prohibit connection of the pre-charge voltage end and the power output end when not receiving the pre-charge on signal, to prohibit the battery core from outputting a pre-charge voltage through the power output end.

A battery cell includes a housing, wherein the housing includes a first wall, the first wall includes an inner surface and an outer surface that are arranged oppositely, and a first through-hole penetrating the inner surface and the outer surface; an electrode terminal, at least partially threaded through the first through-hole; a sealing component, configured to seal a gap between the electrode terminal and the first wall; a connecting piece, arranged outside the battery cell and connected to the electrode terminal; a first insulating member, at least partially arranged between the connecting piece and the first wall to separate the connecting piece from the first wall; and a flow-guiding channel, formed between the first insulating member and the first wall, wherein the flow-guiding channel is in communication with the first through-hole.

An inspection method for a lithium secondary battery can improve the reliability, accuracy, and reproducibility of inspection results by advancing a learning of an artificial neural network according to one or more divided regions of one or more surfaces of the lithium secondary battery and one or more types of defects occurring in each region.