Cordless tool system
A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. The ratio of the discharging time to the charging time is approximately 25:35.
1. A cordless tool system, comprising:
a tool;
a lithium based battery pack for supplying power to the tool; and
a heat absorbing device operably coupled to the lithium based battery pack, wherein the heat absorbing device comprises a phase-change material, the phase-change material comprising a mixture of 80%-90% sodium acetate, 1%-5% sodium dodecyl benzene sulfonate, 1%-5% carboxymethyl cellulose, and 1%-5% sodium carbonate, wherein the tool has a power of equal to or more than 300 W, and wherein the ratio of discharging time to charging time of the lithium based battery pack is approximately 25:35.
2. The cordless tool system as recited in claim 1 , comprising an intelligent charger for releasably receiving and charging the lithium based battery pack.
3. The cordless tool system as recited in claim 2 , wherein the tool has an average working current of equal to or more than 12 A.
4. The cordless tool system as recited in claim 2 , wherein the intelligent charging system charges the lithium based battery pack to one of a fully charged state and a storage state.
5. The cordless tool system as recited in claim 2 , wherein the intelligent charging system charges the lithium based battery pack with a charging current of approximately 8 A.
6. The cordless tool system as recited in claim 1 , wherein the lithium based battery pack has a battery capacity of approximately 4 Ah.
7. The cordless tool system as recited in claim 1 , wherein the tool comprises a mower.
8. The cordless tool system as recited in claim 7 , wherein a discharging time of the lithium based battery pack when used to power the mower is approximately 30 minutes.
9. The cordless tool system as recited in claim 1 , wherein the lithium based battery pack is removeably attachable to the tool.
10. The cordless tool system as recited in claim 1 , comprising a temperature measuring device associated with the lithium based battery pack.
11. The cordless tool system as recited in claim 10 , wherein the temperature measuring device comprises at least one electronic element with a PN junction.
12. The cordless tool system as recited in claim 10 , wherein the temperature measuring device comprises at least one triode.
13. A cordless tool system, comprising:
a tool;
a lithium based battery pack for supplying power to the tool; and
a heat absorbing device operably coupled to the lithium based battery pack, wherein the heat absorbing device comprises a phase-change material, the phase-change material comprising a mixture of 80%-90% sodium acetate, 1%-5% sodium dodecyl benzene sulfonate, 1%-5% carboxymethyl cellulose, and 1%-5% sodium carbonate, wherein the tool has a power of equal to or more than 300 W and an average working current of equal to or more than 12 A, and wherein the lithium based battery pack has a nominal voltage of equal to or more than 56V.
14. A cordless tool system, comprising: a tool; a lithium based battery pack for supplying power to the tool; and
a heat absorbing device operably coupled to the lithium based battery pack, wherein the heat absorbing device comprises a phase-change material, the phase-change material comprising a mixture of 90%-99% polyethylene glycol and 1%-10% cda cellulose diacetate, wherein the tool has a power of equal to or more than 300 W, and wherein the ratio of discharging time to charging time of the lithium based battery pack is approximately 25:35.