| 摘要 |
This purpose of the present invention is to reduce the number of protective elements to be connected to batteries, which are connected in series, in order to lower the production cost while ensuring that the current is shut off during an anomaly to protect the batteries. This battery pack comprises: a battery block (10) wherein a plurality of batteries (1) are connected in series; a switching element (2) connected on an output side of battery block (10); a protection circuit (4) using an intermediate detection line (5) connected between each of the batteries (1) to detect the voltage of each of the batteries (1) and control the switching element (2); and a protective element (3) connected in series to the batteries (1) for shutting off the current when the battery temperature becomes higher than a set temperature. The switching element (2) is connected to a first output side of the battery block (10). The number of protective elements (3) is fewer than the number of batteries (1) connected in series. One among the protective elements (3) is connected to a second output side battery (1X) that is connected to a second output side. This protective element (3) is connected more to the second output side than a connection point (7) where the intermediate detection line (5) is connected, the intermediate detection line (5) being between the second output side battery (1X) and the battery (1) connected in series thereto. |
