Patent Number: 
Section: claims

1. A micro-nuclear battery, comprising:a base frame comprising a bottom, a top and a side wall;a cantilever structure having a free end and a fixed end fixed to the side wall of the base frame and provided with a piezoelectric component thereon; anda radiation unit comprising an upper radioactive source and a lower radioactive source configured to emit electrons to the free end and respectively arranged at positions in inner surfaces on the top and bottom of the base frame corresponding to that are over opposite sides of the free end of the cantilever structure,wherein a width of the free end is greater than a width of the fixed end;wherein a distance between the cantilever structure and one of the upper radiation source and the lower radiation source is smaller than a distance between the cantilever structure and the other of the upper radiation source and the lower radiation source. 2. The micro-nuclear battery according to claim 1, wherein a ratio of the width of the free end to the width of the fixed end is between 2.5 and 6. 3. The micro-nuclear battery according to claim 1, further comprising: a radiation source control module electrically connected to the radiation unit and configured to control the radiation unit to emit electrons periodically. 4. The micro-nuclear battery according to claim 3, wherein the radiation source control module controls the upper radiation source and the lower radiation source to emit electrons alternately. 5. The micro-nuclear battery according to claim 1, wherein the piezoelectric component is formed of a piezoelectric material and is configured to generate a current pulse based on mechanical oscillation of the cantilever structure. 6. The micro-nuclear battery according to claim 1, further comprising:a direct current conversion module electrically connected to the piezoelectric component of the cantilever structure and configured to convert a current pulse generated by the piezoelectric component into a direct current. 7. The micro-nuclear battery according to claim 6, wherein the direct current conversion module further comprises a functional module configured to implement at least one of the following functions: transformation, rectification, filtering, and voltage regulation. 8. The micro-nuclear battery according to claim 1, wherein the radiation unit comprises a β radiation source. 9. The micro-nuclear battery according to claim 1, wherein the free end and the fixed end are connected via a connection portion therebetween. 10. The micro-nuclear battery according to claim 1, wherein the cantilever structure is formed of an elastic material. 11. An energy conversion method using the micro-nuclear battery according to claim 1, comprising:controlling, by the radiation source control module, the radiation unit to periodically emit electrons to the free end of the cantilever structure;generating, by the piezoelectric component, a current pulse based on mechanical oscillation of the cantilever structure; andconverting, by the direct current conversion module, the current pulse generated by the piezoelectric component into a direct current. 12. The energy conversion method of claim 11, wherein controlling the radiation unit to periodically emit electrons to the free end of the cantilever structure comprises: controlling the upper radiation source and the lower radiation source to emit electrons alternately.