BATTERY PACK

In a battery pack, a heat-resistant cap is coupled to an end of a battery block including battery cells positioned at predetermined positions by a battery holder and a circuit board coupled to a first surface and accommodated in an exterior case. Each of the battery cells includes a discharge valve. A heat-resistant cap includes closing plate portion forming first discharge gap between the cap and an end surface of the battery block, and a peripheral wall portion forming a second discharge gap between the peripheral wall portion and the first surface of the battery block. A circuit board forms a ventilation gap between the circuit board and the first surface of the battery block. The ventilation gap communicates with the second discharge gap.