电池板块10月31日跌0.87%，铜冠铜箔领跌，主力资金净流出23.7亿元

Market Overview - The battery sector experienced a decline of 0.87% on the previous trading day, with the Shanghai Composite Index closing at 3954.79, down 0.81%, and the Shenzhen Component Index at 13378.21, down 1.14% [1] Individual Stock Performance - The top decliner in the battery sector was Tongguan Copper Foil, which closed at 35.00, down 8.81% with a trading volume of 647,600 shares and a transaction value of 2.334 billion [2] - Other notable declines included Zhuhai Guanyu at 26.81 (-6.23%), Defu Technology at 34.48 (-5.17%), and Yihua Tong at 29.95 (-3.23%) [2] Capital Flow Analysis - The battery sector saw a net outflow of 2.37 billion from institutional investors and 1.251 billion from speculative funds, while retail investors had a net inflow of 3.621 billion [4] - Key stocks with significant capital flow included Enjie Shares with a net inflow of 619 million from institutional investors, while speculative funds saw a net outflow of 377 million [4]