1.5V lithium battery and manufacturing method thereof
The present application relates to a 1.5V lithium battery. The lithium battery includes a circuit assembly, a plastic frame, a wound battery core assembly, a first metal housing, a second metal housing, a first insulating seal and an insulating sheath. The wound battery core assembly is arranged in the second metal housing, the first metal housing and the second metal housing dock with each other and fixed by circumferential welding, and the circuit assembly includes a PCB, a low-voltage positive cap, a high-voltage positive connecting piece and a negative elastic piece. In the present application, the circuit assembly can stably output a low voltage of 1.5V.
1. A 1.5V lithium battery, comprising a circuit assembly, a plastic frame, a wound battery core assembly, a first metal housing, a second metal housing, a first insulating seal and an insulating sheath, wherein the circuit assembly and the plastic frame are arranged in the first metal housing, the plastic frame is configured to fix the circuit assembly, the wound battery core assembly is arranged in the second metal housing, the first metal housing and the second metal housing dock with each other and are fixed by circumferential welding, the first insulating seal is arranged between the first metal housing and the second metal housing and configured to seal the second metal housing, a horizontal sealing portion further extends inwards from a bottom of the first insulating seal, the horizontal sealing portion is attached to a lower surface of the first metal housing to cover the lower surface of the first metal housing, and the insulating sheath covers the first metal housing and the second metal housing;
a positioning hole is defined in a bottom wall of the first metal housing, a second insulating seal and a riveting piece are provided at the positioning hole, and the riveting piece rivets the second insulating seal to the bottom wall of the first metal housing to seal the positioning hole;
the circuit assembly comprises a printed circuit board (PCB), a low-voltage positive cap, a high-voltage positive connecting piece and a negative elastic piece, the low-voltage positive cap, the high-voltage positive connecting piece and the negative elastic piece are all welded on the PCB, the negative elastic piece is in elastic contact with the first metal housing, the high-voltage positive connecting piece is in elastic contact with an upper end of the riveting piece, a positive tab of the wound battery core assembly is welded to a lower end of the riveting piece, and a negative tab of the wound battery core assembly is welded to the second metal housing.
2. The 1.5V lithium battery according to claim 1 , wherein a lower end of the first metal housing is provided with a contraction portion, and the first insulating seal is partially clamped between the contraction portion and the second metal housing.
3. The 1.5V lithium battery according to claim 2 , wherein an outer annular surface of the first insulating seal is provided with one or more annular protrusions to increase sealing performance between the first insulating seal and the second metal housing.
4. The 1.5V lithium battery according to claim 1 , wherein the second insulating seal is injection molded at the positioning hole, the riveting piece comprises a rivet and a metal piece, a rivet hole is formed in a center of the metal piece, and the rivet is riveted to the metal piece to press the second insulating seal against the bottom wall of the first metal housing, so as to seal the positioning hole.
5. The 1.5V lithium battery according to claim 1 , wherein the circuit assembly further comprises a charging interface, the charging interface is welded on the PCB, and a first opening and a second opening are formed in corresponding positions of the first metal housing and the insulating sheath, respectively.
6. The 1.5V lithium battery according to claim 1 , wherein the plastic frame comprises an upper frame and a lower frame, and the PCB is fixed between the upper frame and the lower frame.
7. The 1.5V lithium battery according to claim 1 , wherein a spun edge is inwardly provided at an upper end of the first metal housing and configured to press the plastic frame, a positive and negative electrode isolating piece is further arranged above or below the spun edge, and part of an upper surface of the positive and negative electrode isolating piece is further wrapped by the insulating sheath.
8. The 1.5V lithium battery according to claim 1 , wherein the low-voltage positive cap is patch welded on the PCB, and some electronic elements on the PCB are arranged in the low-voltage positive cap.
9. The 1.5V lithium battery according to claim 1 , wherein the wound battery core assembly comprises a wound battery core, an upper isolating piece and a lower isolating piece, the positive tab extends out of a central hole of the upper isolating piece, an end portion of the positive tab is welded to a lower surface of the riveting piece, the negative tab is wound from a side surface to a bottom surface of the wound battery core, and an end portion of the negative tab is welded to a bottom wall of the second metal housing.