LONG LIFE BATTERY-Develop Good Manufacturing Habits
Develop Good Manufacturing Habits
Up to now, readers have acquired most of the knowledge necessary to make the electronic circuits in this book.3 However, in order to make the electronic circuits successfully, in addition to the practical practices and techniques already described in this chapter, there are still some practices that must be followed.This will help inexperienced producers improve their production skills.
Most producers are likely to encounter semi-finished products that are only half finished.Some semi-finished products were started long ago, but they have not been finished due to lack of some components.Or because the producer lost confidence and did not finish it.Since the semi-finished product has not yet been installed in the housing with mechanical protection, it is easily damaged.Sometimes semi-finished products are placed on the edge of the workbench, and if they accidentally fall to the ground / they will be completely damaged.In this way, the time, effort and cost of making this electronic circuit will be paid to Oshima Dongliu.
The reason why these semi-finished products are not finished is often not due to lack of interest, ability or skill.It is often due to producers' eagerness to make components before they are ready.Don't forget a basic rule for making electronic circuits: " Never start making an electronic circuit before all the required components, components, connectors and housings are ready." If you start making without some components, you will not be able to make the production work go smoothly from beginning to end. At the beginning, the maker will remember those parts to be set aside and those components to be replaced.However, as time goes on, he will forget all about it.In particular, for those beginners, they were made without a small number of components and finished connecting the wires.However, after a period of time, he has completely forgotten what components are still missing in the circuit.It is believed that the production has been completed and the power supply has been connected.However, because of the lack of individual components in the circuit, the circuit does not work properly or even completely.At this time, he often forgets to find out which components are missing, but is eager to find out the bad solder joints or damaged components in the circuit.Not only is this a waste of time, but sometimes the entire circuit may be damaged and scrapped.
3 - 6 Special Technology for Installing Solar Cells
The solar cell is a very fragile device. It is made on a very thin layer of glass and will be broken if it is not installed carefully.If the surface has not been torn, it can be repaired with transparent adhesive tape.Solar cells must not be bent, even if they are slightly bent, and they should be installed with special care.
The solar cell can only be installed on an insulating base plate with high mechanical strength.Some thicker drilled circuit boards are suitable for mounting smaller solar cells, while larger solar cells need to be mounted on a more solid insulating base plate.A large solar cell occupies a large part of the area on the circuit board, but a circuit board made of the same material has poor mechanical strength with a larger area and a smaller area.The solution is to use two or more circuit boards together to improve the mechanical strength.A single circuit board can also be embedded in an aluminum frame or other solid insulation board to increase the rigidity of the mounting base plate.
Most solar cells have no leads.Therefore, it is necessary to connect the leads on the solar cells with thin insulated wires.One is welded to the connecting strip on the front side of the solar cell, while the other is welded to the metal bottom plate on the back side.Figs. 3 - 18 show the proper positions of the welding leads on the front of the solar cell in circular figs. 3 - 18
The front of the solar cell is welded to the appropriate position of the lead wire.The other lead can be soldered to any point on the back.
The lead wire must be a soft twisted wire. If a hard wire is used, the solar cell will be broken due to bending stress during wiring.The use of twisted wire w or less than 16 is sufficient to meet the needs of the solar cell with the largest capacity.
3 - 7 Assault Installation of Solar Cells
It is ideal to install solar cells on a solid insulating base plate, but special tools and materials are required.Large solar cells occupy several square inches of the drilled circuit board.If it is mounted on an aluminum frame or other metal bracket, the weight is a major problem.In addition, when a plurality of cells are used, the connection between the leads on the back of the solar cells and other solar cells is also a problem.As the solder on the back of the solar cell will make its surface extremely low and uneven, the solar cell will not fit very flat.If the solar cell is pressed down too heavily, the solar cell can be broken due to the unevenness of the surface.In order to make the solar cells completely flat in structure, it is often necessary to adopt the technology of manufacturing printed circuit boards.
A few years ago, the author wanted to assemble 13 large solar cells into a solar power supply in a short time.The work starts in the morning and must be finished before evening.Because the battery used is large in size and very easy to break, it took several hours to connect the lead to the battery.However, the real problem is how to install the 13 solar cells on a small positive bottom plate, and at this time, there is no suitable circuit board at hand.The author adopted the so-called " surprise installation" method for the first time. This method was discovered by accident, but the effect was very good.
Thirteen solar cells were packed when they were bought.This kind of packing was originally used to prevent vibration and collision during transportation and to hang it on the exhibition stand.Each battery was placed on a circular foam pad, which was then used as a mounting base for each battery.
Figs. 3 - 19 show the actual installation of solar cells on the foam plastics gasket.The foam pad is trimmed to the same size as the battery.The leads from the back of the battery pass through the foam pad and extend from the top.A drop of epoxy resin or any quick-drying adhesive is used to stick the battery to the foam pad, and then a drop of adhesive is used to bond the foam pad to the insulating base plate, which does not need to be particularly hard.The author used a piece of cardboard.