Blocking device, battery cap and battery

The invention discloses a blocking device. The blocking device is installed above the explosion-proof valve in the battery cap, the explosion-proof valve comprises a hollow installation part and an explosion part installed in the installation part, the blocking device can be connected with the explosion part in an abutting mode, a ventilation part is arranged on the blocking device, and the invention further discloses an end cover comprising the blocking device and a battery. The blocking device has the beneficial effects that when a battery cell of the battery is subjected to thermal runaway,the blocking device can block the explosion part in the explosion-proof valve from moving upwards, so that substances in the battery can be delayed or prevented from rushing out, harm caused by leakage of chemical substances in the battery can be reduced or avoided, and the safety performance of the battery can be improved. 本发明公开了一种阻挡装置，阻挡装置安装在电池盖帽中防爆阀的上方，防爆阀包括一中空的安装部以及安装在安装部内的爆破部，阻挡装置能够与爆破部抵接，阻挡装置上设置有透气部，本发明还公开了一种包括该阻挡装