CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International Application No. PCT/CN2018/083386, filed on Apr. 17, 2018, which claims priority to Chinese Patent Application No. 201820179736.3, filed on Feb. 1, 2018, both of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The disclosure relates to the technical field of power battery, and in particular to a power battery and a battery module.

BACKGROUND

The power battery generally includes an electrode assembly, a case, and a cap assembly. The electrode assembly is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet around a winding axis. The electrode assembly is accommodated in the case, and the cap assembly is assembled together with the case and is disposed corresponding to an end of the electrode assembly along the winding axis. The cap assembly includes a cap plate and an electrode terminal disposed in the cap plate, and herein a tab of the electrode assembly is electrically connected to the electrode terminal of the cap assembly. The cap plate includes a liquid injection hole communicating with a closed space.

SUMMARY

Embodiments of the disclosure provide a power battery and a battery module. The power battery protects the end of the electrode assembly during the liquid injection, and reduces a probability that a short circuit occurs between a positive electrode sheet and a negative electrode sheet.

In one aspect, embodiments of the disclosure provide a power battery, including: a case including two openings opposite to each other; an electrode assembly which is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet around a winding axis, the electrode assembly being disposed in the case, and two opposite ends of the electrode assembly along the winding axis being respectively disposed corresponding to the two openings; a first cap assembly covering one of the two openings, the first cap assembly including an liquid injection hole communicating with an interior of the case; a second cap assembly covering the other of the two openings, the second cap assembly including a through hole communicating with the interior of the case; in a length direction, the liquid injection hole and the through hole are located on a same side of a central axis of the case.

In another aspect, embodiments of the disclosure provide a battery module including a plurality of power batteries as described above.

