Computing device

1. A computing device comprising:

a processor;

memory accessible to the processor;

a lithium-ion battery;

a power interface;

magnet control circuitry operatively coupled to at least the power interface for receipt of electrical power; and

a housing for the processor, the memory, the lithium-ion battery, the power interface and the magnet control circuitry, wherein the housing comprises a first shell, a second shell, and an electropermanent magnet assembly that generates a magnetic force that couples the first shell to the second shell, wherein the electropermanent magnetic assembly is controllable via the magnet control circuitry to decrease the magnetic force to decouple the first shell from the second shell.

2. The computing device of claim 1 , wherein the magnet control circuitry is activated by supply of power to the power interface.

3. The computing device of claim 1 , wherein the magnet control circuitry is in an inactive state when electrical power of the lithium-ion battery is depleted.

4. The computing device of claim 1 , comprising a ferromagnetic target material, wherein the magnetic force is a magnetic attraction force between the electropermanent magnet assembly and the ferromagnetic target material.

5. The computing device of claim 1 , wherein the magnet control circuitry reverses polarity of a magnet of the electropermanent magnet assembly to decrease the magnetic force.

6. The computing device of claim 1 , wherein the electropermanent magnet assembly comprises a coil that surrounds at least one magnet.

7. The computing device of claim 6 , wherein the magnet control circuitry comprises a current pulse generator electrically coupled to the coil.

8. The computing device of claim 1 , wherein the first shell and the second shell comprise a tongue and a groove and wherein the magnetic force of the electropermanent magnet assembly is controllable via the magnet control circuitry to cause movement between the tongue and the groove.

9. The computing device of claim 1 , comprising firmware instructions stored in the memory that are executable by the processor to establish a firmware environment, wherein status of the magnetic control circuitry is detectable via the firmware environment.

10. The computing device of claim 9 , wherein the magnet control circuitry is controllable via the firmware environment.

11. The computing device of claim 1 , comprising operating system instructions stored in the memory that are executable by the processor via a boot process to establish an operating system environment.

12. The computing device of claim 11 , wherein the boot process depends on a tamper detection status of the magnet control circuitry.

13. The computing device of claim 12 , wherein, for a tamper detection status that indicates tampering, the boot process does not allow for establishment of the operating system environment.

14. The computing device of claim 1 , comprising a shield material disposed at least in part between the electropermanent magnet assembly and an electronic component disposed in the housing.

15. The computing device of claim 1 , comprising a power storage unit, wherein the magnet control circuitry is electronically coupled to the power storage unit for control of the electropermanent magnet assembly.

16. The computing device of claim 15 , wherein the processor and the memory are electronically coupled to the lithium-ion battery.

17. The computing device of claim 16 , wherein the power storage unit is independent of the lithium-ion battery.

18. The computing device of claim 17 , wherein the power storage unit comprises a capacitor.

19. The computing device of claim 1 , wherein the first shell is coupled to the second shell via the magnetic force and without rotatable fasteners.

20. The computing device of claim 1 , comprising a rotatable fastener that couples the first shell to the second shell, wherein the magnet control circuitry depends on a position of the rotatable fastener.