Battery explosion-proof device and battery pack comprising the same
A battery explosion-proof device battery explosion-proof device includes a valve body, a rupture plate, and a protecting cover. The valve body includes a base portion and a shaft portion connected with the base portion. The shaft portion may be formed with threads on an external circumferential surface thereof and with a venting passage. The rupture plate may be disposed inside a concaved portion of the base portion for sealing the venting passage. The protecting cover covers the concaved portion.
1. A battery explosion-proof device, comprising:
a valve body including:
a base portion having an opening; and
a shaft portion connected with the base portion, wherein the shaft portion includes threads on an external circumferential surface thereof, and the valve body includes a venting passage in communication with the opening;
a rupture plate disposed inside the opening for sealing the venting passage; and
a protecting cover configured to cover the opening, the protecting cover comprising
a seal plate formed with a central hole;
a net portion covering the central hole; and
a suspension clip portion formed on a surface of the seal plate facing the opening;
wherein the base portion is formed with a second opening at a side wall thereof to be buckled with the suspension clip portion.
2. The battery explosion-proof device of claim 1 , wherein the opening includes a concave portion.
3. The battery explosion-proof device of claim 2 , wherein an annular groove around the shaft portion is formed at a surface of the base portion where the base portion is connected with the shaft portion.
4. The battery explosion-proof device of claim 1 , wherein the base portion is formed with a mounting surface where the rupture plate is disposed, and the venting passage penetrates through the mounting surface to be in communication with the opening.
5. The battery explosion-proof device of claim 4 , wherein the rupture plate is welded to the mounting surface.
6. The battery explosion-proof device of claim 5 , wherein a circumferential surface of the venting passage is connected with the mounting surface via a transition surface.
7. The battery explosion-proof device of claim 6 , wherein the rupture plate is formed with an arcual dent which has a diameter larger than an inner diameter of the venting passage and smaller than an external diameter of the transition surface.
8. The battery explosion-proof device of claim 1 , wherein the rupture plate is made of steel, nickel, copper, aluminum material, or stainless steel.
9. The battery explosion-proof device of claim 7 , wherein the arcual dent has a trapezoidal, reversed triangular, rectangular, arcual, or circular cross section.
10. The battery explosion-proof device of claim 5 , wherein the rupture plate is welded at the mounting surface via electron beam welding or laser welding.
11. A battery pack, comprising:
a lower shell;
at least one battery module accommodated in the lower shell; and
an upper shell mated with the lower shell for sealing the battery pack, wherein at least the upper shell includes a battery explosion-proof device, which includes:
a valve body including:
a base portion having an opening; and
a shaft portion connected with the base portion, wherein the shaft portion includes threads on an external circumferential surface thereof, and the valve body includes a venting passage in communication with the opening;
a rupture plate disposed inside the opening for sealing the venting passage; and
a protecting cover configured to cover the opening, the protecting cover comprising
a seal plate formed with a central hole;
a net portion covering the central hole; and
a suspension clip portion formed on a surface of the seal plate facing the opening;
wherein the base portion is formed with a second opening at a side wall thereof to be buckled with the suspension clip portion.
12. The battery pack of claim 11 , wherein the shaft portion is threadedly connected with the upper shell.
13. The battery pack of claim 11 , wherein the shaft portion penetrates through an installing hole on the upper shell and the shaft portion is tightened with the upper shell via a mating nut.
14. The battery pack of claim 11 , wherein the opening includes a concave portion.
15. The battery pack of claim 11 , wherein an annular groove around the shaft portion is formed at a surface of the base portion where the base portion is connected with the shaft portion.
16. The battery pack of claim 11 , wherein the protecting cover comprises:
a seal plate formed with a central hole;
a net portion covering the central hole; and
a suspension clip portion formed on a surface of the seal plate facing the opening.
17. A battery explosion-proof device, comprising:
a valve body including:
a base portion having an opening; and
a shaft portion connected with the base portion, wherein the shaft portion includes threads on an external circumferential surface thereof, and the valve body includes a venting passage in communication with the opening;
a rupture plate disposed inside the opening for sealing the venting passage and formed with an arcual dent which has a diameter larger than an inner diameter of the venting passage; and
a protecting cover configured to cover the opening.