Core Viewpoint - The recent issues surrounding multi-brand power banks, including recalls, removal from e-commerce platforms, and safety concerns regarding lithium battery cells, have sparked significant public discussion about the safety and management of lithium batteries [1][3]. Group 1: Lithium Battery Characteristics - Lithium batteries, including both ternary lithium and lithium iron phosphate batteries, are categorized as chemical batteries composed of positive and negative electrodes, electrolyte, and separator [1]. - The positive electrode materials include lithium cobalt oxide, lithium manganese oxide, nickel cobalt aluminum oxide, ternary materials, and lithium iron phosphate, while lithium serves as the active material in the negative electrode [1][3]. Group 2: Causes of Thermal Runaway - During normal charge and discharge cycles, lithium ions move between the electrodes, but factors such as usage time, charge/discharge cycles, and temperature differences can increase internal resistance [3]. - External factors like overcharging, over-discharging, short circuits, and high temperatures can lead to chemical reactions within the battery, potentially resulting in thermal runaway, where internal heat cannot be dissipated, leading to fire or explosion [3][4]. Group 3: Firefighting Methods for Lithium Battery Fires - Once thermal runaway occurs, high temperatures can decompose the electrolyte, producing flammable gases like hydrogen and methane, which can ignite without oxygen [5]. - Water is considered one of the most effective extinguishing agents for lithium battery fires, as it can absorb heat through evaporation, lowering the battery's temperature and preventing further thermal runaway [9]. - Perfluorohexane is also effective in extinguishing battery fires due to its cooling, oxygen-isolating, and chemical suppression properties, although it is more expensive [11].

Group 1 - The core theme of the recent safety production month activities in Hangzhou is "Everyone Talks Safety, Everyone Knows Emergency" focusing on identifying safety hazards in the community [1] - The Xihu District introduced an "Emergency Ark" equipped with advanced safety technologies, providing a one-stop safety advisory service covering various safety topics [1] - The event showcased innovative emergency rescue technologies, including robotic dogs for forest fire patrol and drones for aerial emergency rescue [1] Group 2 - The Qiantang District organized diverse safety promotion and emergency drill activities, incorporating a "theory + practice + competition" model in their safety classes [2] - Interactive projects included a fire safety knowledge quiz, identifying daily hazards from cartoons, and practical demonstrations of emergency equipment [2] - Emergency drills simulated critical situations such as toxic exposure in confined spaces, forklift accidents, and hazardous material leaks, enhancing participants' emergency response skills [2]

Group 1 - The property management of the Jining Jingyun Residence has been reported for falsifying fire inspection records, including backdating and pre-filling dates [2] - Residents have raised concerns about the management of fire safety equipment, with issues such as empty fire extinguishers and lack of fire hoses in fire cabinets [2][3] - The property management company has received multiple fines from the Jining Fire Rescue Team for failing to maintain fire safety equipment properly [4] Group 2 - The effective lifespan of dry powder fire extinguishers is typically 10 years, and the extinguishers in the Jining Jingyun Residence have not been maintained or replaced as required [4] - The property management has been unresponsive to complaints, with attempts to contact the property manager resulting in no response [5] - Local emergency management officials have stated that they can only urge the property management to rectify the issues and will escalate the matter to higher authorities if necessary [5]

Group 1 - A fire drill was conducted in the historical cultural district of Taitown, Yidong District, Anshan City, focusing on fire safety in old buildings [1] - The district has over 100 old buildings from the 1920s and 1930s, making fire prevention work complex [1] - Regular inspections are conducted by community staff, grid workers, and volunteers to check fire safety, particularly in electrical wiring and gas pipelines [1] Group 2 - The inspections emphasize monitoring the electrical load in old buildings to ensure it remains within safe limits [1] - The district office collaborates with waste recycling personnel to assist elderly residents in clearing clutter that may pose fire hazards [1] - Fire extinguishers' functionality is crucial, and training on the use of dry powder extinguishers was provided after the drill [1][2] Group 3 - Dry powder extinguishers are preferred for old buildings due to their long usage and complex electrical environments [3] - The pressure gauge on dry powder extinguishers has three color zones indicating operational status: green for normal, red for low pressure, and yellow for high pressure [3] - Regular checks on the appearance and condition of extinguishers are necessary to ensure they are in working order [2][3]