The secondary battery of the present application includes a cell, an electrolyte and a case, the cell includes electrodes and a separator. The secondary battery further includes a gas-generating additive and a water-generating additive. During the overcharging process of the Li-ion battery, when the battery reaches a certain temperature, the water-generating additive decomposes and generates a large amount of water. Then, Li salt and the gas-generating additive are induced to decompose and generate a large amount of gas, so that when the internal pressure of the battery reaches a certain value, the charging current is interrupted in advance by a device for interrupting charging current. Moreover, the water-generating additive can absorb the heat generated by the battery during decomposition, so that the internal temperature of the battery decreases, thereby preventing the overcharge failure of the battery.

A rechargeable lithium battery includes a positive electrode including a positive electrode active material including a secondary particle in which a plurality of primary particles are aggregated, the secondary particle having at least a portion of the primary particles radially arranged and comprising a lithium nickel-based composite oxide, and a boron coating layer on the surface of the secondary particle and including lithium borate; a negative electrode; a separator between the positive electrode and the negative electrode; an electrolyte including vinylene carbonate; and a case containing the positive electrode, the negative electrode, the separator, and the electrolyte.

A traction battery of a vehicle includes a temperature compensated passive wireless surface acoustic wave sensor within the traction battery and a controller. The temperature compensated passive wireless surface acoustic wave sensor is configured to receive a broadcast signal and transmit a reflected signal. The controller is programmed to transmit the broadcast signal and receive the reflected signal, and based on a difference in phase and amplitude between the broadcast and reflected signals indicative of an increase in pressure within the traction battery, stop charging the traction battery.

An encasing film for a galvanic element has at least one force sensor for detecting an expansion state of the encasing film. The encasing film is produced from an elastic and electrically insulating material, e.g., plastic. The force sensor, which has a strain gauge, is situated on a surface of the encasing film.

A method for managing gas generated during a formation phase of a cell that is a hard-case electrochemical cell, the method may include supplying electrolyte to the cell; initially charging and discharging the cell during a formation phase; and permanently sealing the cell; wherein the method further comprises temporarily sealing the electrolyte during the formation phase.

A degassing device includes a piercing unit including a piercing body configured to be disposed on a first surface of the secondary battery to seal one side of the first surface of the secondary battery, and a piercing member configured to pierce the sealed one side of the first surface of the secondary battery to form an opening hole; and a gas discharge unit including a gas discharge body configured to be disposed on a second surface of the secondary battery to seal one side of the second surface of the secondary battery, and a gas discharge member configured to discharge the gas within the secondary battery to the outside through the opening hole, wherein the piercing member is configured to form the opening hole passing from the one side of the first surface to the one side of the second surface of the secondary battery.

An apparatus and method to detect an abnormal behavior of a battery, including a receiving portion receiving information indicating a temperature value, a pressure value, and a gas concentration value respectively from a temperature sensor measuring temperature inside a battery module, a pressure sensor measuring pressure inside the battery module, and a gas sensor measuring gas concentration inside the battery module, a comparison portion comparing the temperature value, the pressure value, and the gas concentration value with first, second, and third threshold values, respectively, and a detection portion determining occurrence of abnormal behavior of the battery when the comparison result shows the pressure value exceeding the second threshold value falling below the second threshold value or the gas concentration value exceeding the third threshold value, while the temperature value exceeds the first threshold value.

A battery pack includes a battery pack housing that is flooded with a dielectric fluid and sealed. The battery pack includes a vent block disposed on an outer surface of the housing, and a bladder disposed inside the housing that communicates with the vent block via a fitting. The bladder interior space includes air, and the bladder expands and contracts to accommodate volume changes of the dielectric fluid due to changes in the environment of the battery pack.

A battery cell, including a housing, a pressure relief member disposed on a first wall of the housing, an electrode assembly disposed inside the housing, an electrolyte immersing the electrode assembly, and a sealing member and an active substance that are disposed inside the housing. The sealing member is configured to seal the active substance on a side of electrode assembly close to the first wall. The sealing member is configured to be actuated when an internal pressure or temperature of the battery cell reaches a first threshold, to release the active substance, and the active substance is able to react with the electrolyte and/or the electrode assembly to increase the internal pressure or temperature of the battery cell, so as to actuate the pressure relief member. The battery cell can quickly discharge its internal temperature and pressure when experiencing thermal runaway, and the battery cell has good safety performance.

The present disclosure relates to methods for monitoring the health of a battery cell. Specifically, the method includes receiving, by a controller communicatively coupled a pressure sensor positioned proximate to a battery housing having an initial volume and an initial shape and containing a battery cell, a pressure value indicative of a current volume or a current shape of the battery' housing. The pressure sensor is configured to measure the pressure value indicative of the current volume or the current shape of the battery' housing. The method also involves comparing, by the controller, the pressure value to a predetermined threshold pressure value. The method further involves adjusting, by the controller and based on the comparison, at least one parameter associated with operations of the battery cell.