Rechargeable battery module

1. A rechargeable battery module, comprising:

a plurality of rechargeable battery cells, each having identical appearance, arranged in the same direction, and connected to each other in series or parallel for providing power;

two end portion fixing structures, each comprising:

a plurality of end portion accommodating sections, formed in the same plane, each end portion accommodating section comprising at least one limiting structure, disposed at an end of the end portion accommodating section for accommodating one end of the rechargeable battery cell and limiting movement of the rechargeable battery cell not to go beyond the limiting structure; and

an end portion fixing tube, formed among the end portion accommodating sections;

a middle fixing structure, comprising:

a plurality of hollow portions, formed in the same plane, a cross-sectional shape of each hollow portion is substantially similar and larger than the cross-sectional shape of each of the rechargeable battery cells, for fixing the rechargeable battery cells; and

a plurality of fixing grooves, each fixing groove formed in one side of the middle fixing structure;

a plurality of thermal bars, each thermal bar fixed with at least one fixing groove, for conducting heat generated out from the rechargeable battery cells via the middle fixing structure;

a bolt; and

a nut,

wherein, the two end portion fixing structures are positioned in opposite directions, the bolt passes one end portion fixing tube, middle fixing structure and the other end portion fixing tube and fixes the rechargeable battery module by linking with the nut, and the rechargeable battery cells are fixed along an axial direction of the bolt by the limiting structures of the end portion accommodating sections in the two end portion fixing structures.

2. The rechargeable battery module according to claim 1 , wherein an end of the end portion accommodating section has an opening to expose an electrode.

3. The rechargeable battery module according to claim 1 , wherein the end portion fixing structure further comprises a nut accommodating portion, for accommodating the nut when the bolt is linked to the nut.

4. The rechargeable battery module according to claim 1 , wherein the middle fixing structure further comprises a fixing hole, accommodating end portions of the two end portion fixing tubes, for fixing the two end portion fixing tubes.

5. The rechargeable battery module according to claim 1 , wherein the end portion fixing structure is made by thermosetting plastic or metal material.

6. The rechargeable battery module according to claim 1 , wherein the middle fixing structure is made by thermosetting plastic or metal material.

7. The rechargeable battery module according to claim 1 , wherein a cross-sectional shape of the thermal bar is round, square or hexagonal.

8. The rechargeable battery module according to claim 1 , wherein the thermal bar is made by metal or alloy.

9. The rechargeable battery module according to claim 8 , wherein the metal is aluminum, brass or copper.