PHASE-CHANGE MICROCAPSULE, SEPARATOR, ELECTRODE PLATE, BATTERY, AND ELECTRICAL DEVICE

1 . A phase-change microcapsule, comprising: a core and an insulative heat-conducting wall material wrapped around the core, wherein

the core comprises a first phase-change component and a second phase-change component, the first phase-change component is paraffin with a melting point of 37° C. to 42° C., the second phase-change component is paraffin with a melting point of 65° C. to 75° C., and a melting point of the insulative heat-conducting wall material is greater than 75° C.; and

a mass ratio between the first phase-change component and the second phase-change component is 35:(45 to 77).

2 . The phase-change microcapsule according to claim 1 , wherein a structural formula of the paraffin used as the first phase-change component is: C n H 2n+2 , wherein 18≤n≤21; and

a structural formula of the paraffin used as the second phase-change component is: C n′ H 2n′+2 , wherein 25≤n′≤28.

3 . The phase-change microcapsule according to claim 1 , wherein, in the phase-change microcapsule, a mass ratio between the wall material and the core is 1:(3 to 4).

4 . The phase-change microcapsule according to claim 1 , wherein the insulative heat-conducting wall material comprises a substrate and ceramic particles dispersed in the substrate, and the substrate is a polymer; and

optionally, the polymer comprises phenolic resin.

5 . The phase-change microcapsule according to claim 4 , wherein, in the phase-change microcapsule, a mass ratio between the substrate and the ceramic particles is 3:(4 to 5), and a mass ratio between the substrate and the core is 1:(2 to 3).

6 . The phase-change microcapsule according to claim 4 , wherein, the ceramic particles comprise a silicon dioxide particle; and

optionally, a particle diameter of the silicon dioxide particle is 60 to 90 nm.

7 . The phase-change microcapsule according to claim 1 , wherein a particle diameter of the phase-change microcapsule is 0.5 to 4 μm.

8 . A separator, wherein an edge of the separator is coated with a coating layer, and the coating layer contains the phase-change microcapsule according to claim 1 .

9 . The separator according to claim 8 , wherein a thickness of the coating layer is 10 to 35 μm, optionally 10 to 20 μm, and optionally 25 to 35 μm.

10 . An electrode plate, wherein the electrode plate comprises a current collector and a tab connected to each other, a heat transfer coefficient of the tab is greater than or equal to 380 W/m·k, at least one side of the tab is coated with a coating layer, and the coating layer contains the phase-change microcapsule according to claim 1 .

11 . The electrode plate according to claim 10 , wherein a thickness of the coating layer is 10 to 35 μm, optionally 10 to 20 μm, and optionally 25 to 35 μm.

12 . A battery, comprising a separator and an electrode plate, wherein the electrode plate comprises a current collector and a tab connected to each other;

a coating layer is applied between the tab and the separator, and the coating layer is formed on the tab and/or formed on the separator; and

the coating layer contains the phase-change microcapsule according to claim 1 .

13 . The battery according to claim 12 , wherein a thickness of the coating layer between the separator and the tab is 20 to 35 μm.

14 . An electrical device, equipped with the battery according to claim 12 .