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真相来了丨下雨天开新能源电车会触电?谣言!
Yang Shi Wang· 2025-06-25 17:41
Core Viewpoint - The recent claims that electric vehicles (EVs) are unsafe to drive in rainy conditions due to electric shock risks have been debunked by experts, emphasizing that EVs are designed with adequate waterproofing and safety measures [1][11]. Group 1: Battery Design and Safety Standards - Electric vehicle batteries are generally designed with IP67 or higher waterproof ratings, ensuring they remain intact even when submerged for a limited time, thus eliminating leakage risks [2][8]. - According to national standards, all marketed EVs must pass rigorous water immersion tests, including driving in 100mm deep water at specified speeds for a minimum distance [4]. - The national standard for power batteries mandates that all batteries must meet mechanical vibration durability tests followed by water immersion tests [5]. Group 2: Safety Mechanisms and Expert Insights - Experts highlight that EVs are equipped with multiple safety mechanisms that automatically disconnect high-voltage power in case of detected anomalies, ensuring safety during normal operation [9]. - While driving in heavy rain or flooded areas poses general driving risks, it does not specifically relate to electric shock concerns, allowing for safe operation of EVs in such conditions [11]. - Charging an EV in rainy weather is not as dangerous as commonly perceived, as the charging process begins in a disconnected state, ensuring safety checks are in place before high-voltage current is activated [13]. Group 3: Precautions for Charging in Rainy Conditions - To ensure safety while charging during heavy rain, EV owners should take precautions such as selecting appropriate charging locations, avoiding waterlogged charging stations, and following proper operational guidelines [15].
5月经济数据解读:消费回升能持续吗?
CAITONG SECURITIES· 2025-06-16 09:46
Group 1: Economic Overview - In May, industrial production growth slightly decreased to 5.8% year-on-year, primarily due to weakened export activities influenced by tariff fluctuations[12] - Fixed asset investment growth fell to 2.7%, with real estate investment declining by 12%[21] - Retail sales growth increased to 6.4%, indicating enhanced consumer momentum, with service retail sales rising to 5.2%[26] Group 2: Real Estate Market - National real estate sales area growth rate dropped to -3.3%, with a two-year average growth rate narrowing to -12.4%[29] - New housing sales area growth rate continued to decline, while prices for new and second-hand homes showed a narrowing year-on-year decline[30] - Construction area growth rebounded significantly, but new construction area growth remained at -19.3%[30] Group 3: Consumer Behavior - Consumption rebounded due to the combination of trade-in subsidies and increased holiday spending, with inbound tourism transactions increasing by 2.4 times in number and 1.3 times in value[13] - The growth rates for essential and discretionary consumer goods reached 8.2% and 8.5%, respectively, with two-year average growth rates also rising[26] Group 4: Risks and Future Outlook - External demand is expected to weaken as tariff exemptions expire, potentially impacting production and investment[13] - The urban unemployment rate remained stable at 5.0%, indicating a steady employment situation despite economic fluctuations[33]
都市车界|探究新能源电池寿命之谜:“8年报废”之说是真是假?
Qi Lu Wan Bao· 2025-06-09 07:00
Core Viewpoint - The notion that electric vehicle batteries must be discarded after eight years is a misunderstanding, as battery lifespan is influenced by various factors including usage patterns and environmental conditions [7][12]. Group 1: Warranty and Battery Lifespan - Different brands have varying warranty periods for electric vehicles, with some offering lifetime warranties for key components like batteries [2][5]. - The mandatory warranty for batteries is at least 8 years or 120,000 kilometers, but this does not guarantee that the battery will fail after this period [5][7]. - Battery performance typically declines over time, affecting the overall driving experience, and replacement costs can be significant [4][6]. Group 2: Factors Affecting Battery Life - Battery lifespan is determined by multiple factors, including charge cycles, calendar life, and environmental conditions [7][8]. - Current lithium-ion batteries can last approximately 10 to 20 years under normal usage conditions, with three types of lithium batteries having different cycle counts [7][8]. - Poor usage habits, such as frequent overcharging or exposure to extreme temperatures, can accelerate battery degradation [8][12]. Group 3: Second-Hand Market Impact - The condition of the battery significantly affects the resale value of electric vehicles, with older models often valued at only 20% of their original price due to battery performance decline [9]. - Early electric vehicle models may exhibit more pronounced battery degradation, leading to cautious evaluations by second-hand dealers [9]. Group 4: Battery Replacement Indicators - Signs that a battery may need replacement include rapid loss of charge, inability to reach full capacity, and significant reductions in driving range [10][11]. - Regular health checks and monitoring of battery performance are recommended to ensure longevity and performance [11]. Group 5: Best Practices for Battery Maintenance - Maintaining battery charge between 20% and 80% and minimizing fast charging can extend battery life [11][12]. - Temperature management is crucial, with recommendations for insulation in cold climates and avoiding immediate charging after exposure to heat [12].
5月“科学”流言榜发布 这几条骗了我们好多年……
Yang Shi Xin Wen· 2025-05-30 01:19
Group 1 - The common misconception that electric vehicles cannot be driven in the rain due to electric shock risks is debunked. Electric vehicles are designed with waterproof and leak-proof features, typically rated IP67 or higher, ensuring safety during rain [2][5] - All electric vehicles must pass rigorous water immersion tests as per the national safety standards, which include driving in water up to 100mm deep at a speed of 20km/h for at least 500 meters [2] - Additional safety mechanisms in electric vehicles include waterproof circuits and automatic disconnection of high-voltage power in case of anomalies, emphasizing that driving in rain is safe as long as general driving safety is observed [5] Group 2 - The belief that swimming right after eating can lead to leg cramps is clarified. Cramps are more commonly caused by electrolyte imbalance, muscle fatigue, or inadequate warm-up rather than blood flow diversion to the digestive system [6][9] - It is suggested that light meals do not require a waiting period before swimming, while heavier meals should allow for a 30 to 60-minute interval to avoid discomfort [9] - Proper warm-up, hydration, and awareness of individual health conditions are recommended to prevent cramps during swimming [10][11][12] Group 3 - The myth that early use of glasses can worsen children's myopia is addressed. The progression of myopia is linked to eye shape changes rather than the use of corrective lenses [13][18] - Children should be encouraged to have regular eye check-ups and maintain visual health records to manage myopia effectively [18] Group 4 - The claim that removing polyps can lead to more polyps is refuted. Timely removal of certain types of polyps is crucial due to their potential cancer risk, and removal does not cause an increase in polyps [19][24] - New polyps found after removal may be previously undetected or a result of incomplete removal, not a consequence of the removal process itself [24] Group 5 - The notion that shaving facial hair makes it grow back thicker is a common misconception. The thickness of hair is determined by the structure of hair follicles, which is influenced by genetics and hormones, not shaving [25][29] - The perception of increased thickness after shaving is due to the blunt edge of newly cut hair, not an actual change in hair characteristics [29] Group 6 - The belief that drinking vinegar or swallowing food can help dislodge fish bones stuck in the throat is misleading. These methods are ineffective and can potentially worsen the situation by pushing the bone deeper [34][38] - If a fish bone is lodged, it is advised to cough forcefully or seek medical attention if there is significant pain or discomfort [38] Group 7 - The idea that tea residue is beneficial for maintaining teapots is incorrect. Tea residue can harbor harmful substances and microorganisms, affecting both the teapot's integrity and health [39][43] - Regular cleaning of teapots is essential to prevent the accumulation of tea residue and maintain the quality of the tea [43]
美联储改制,鲍威尔重大表态!加息降息成迷局?
Sou Hu Cai Jing· 2025-05-19 00:10
Group 1 - The Federal Reserve's adjustment of its monetary policy framework indicates a potential shift away from the average inflation targeting (AIT) to a more flexible inflation targeting (IT) model, which could increase the likelihood of interest rate cuts [3][6] - If the Fed adopts the IT model, it will allow for more responsive decision-making based on monthly CPI data, potentially leading to a stronger rate-cutting cycle [6] - Historical precedents show that the Fed's rate-cutting cycles have significant impacts on both the U.S. and global economies, as seen during the 2007-2008 financial crisis and the 2019-2020 pandemic period [6][8] Group 2 - The anticipated rate cuts could stimulate consumer demand and benefit export-oriented manufacturing sectors in China, such as home appliances and semiconductors, especially if U.S.-China trade relations improve [8] - Emerging industries, including green economy projects and cross-border finance, are expected to see rapid growth, creating new job opportunities in high-demand sectors like renewable energy and technology [8] - Investment opportunities in China's A-shares, particularly in solid-state batteries and new energy vehicles, are highlighted, with companies like CATL and BYD identified as having strong growth potential [10]