The invention relates to a double action battery for starting gasoline operatid Otto-engines. This improved battery supplies the ignition circuit of the engine. It is functionally divided and exhibits increased dynamic starting capacity. It is known that the starting of the overwhelming majority of presently operated gasoline engine is solved by simultaneously using series main circuit, direct current self- starting motor and high voltage ignition transformer.

The energy required for this is supplied by the battery, of which the limited magnitude of the current available at its terminals is defined by the geometrical dimensions and the weight of the battery. During starting, the battery is to per¬ form double functions:

To ensure the high performance necessary for the serially energized direct current engine that carries out the turning of the main axle. This requires high current beside given vol¬ tage (decreasing on loading) .

To supply reliable spark which ensures necessary magnitude

( ) voltage to reach the primary coil of the ignition trans¬ former and the circuit breaker contact.

The two tasks contradictory from electrical point of view - because of the limited capacity and the internal resistance of the battery - can be satisfied by the battery only with limitations. Unusually high current is required under low temperatures to bring about the starting torque for the self- starting engine, when the engine oil is congeled and the spare-parts are also contracted together and thus the mechanical resistance is increased. At the same time, the capacity of the battery is reduced, resulting from the principle that with reduced temperature the electrochemical reaction is also slowed down. The characteristic curves for the revolutions of the self-starting engine - current abεorbtion, and the battery voltage - current are shown in coordinate system of Fig. 1.

The electric starter motor absorbs the highest current (I max) when starting (at n=o revolution) , during which load a decreased U^ _j ^ή voltage is present at the terminals of an eletrically charged battery showing an internal resistance rfci- With increase in revolutions the quantity of current absorbed by the starter engine reduces. With reduction in load, the terminal voltage Ujς of the battery increases. The loading current reduces at ^ revolutions such that the terminal voltage of the battery will reach the UJJ output voltage which is minimally required for generating ignition sparks. The magnitude of the peak-voltage on the secondary coil of the ignition transformer - the energy of the spark - is proportional to the value of the primary current before contact breaking. If the primary coil does not receive enough voltage, the required primary current cannot be achieved. Decrease in temperature or increasing discharge will result in the increase of the internal resistance of the battery. As a result a situation marked with rj^ is achieved when at maximum rotational speed terminal voltage will not reach the value Ujr. (This procedure is known as grinding, in drivers' sleng) . The characteristic curve for the internal

resistance r _j -,2 is the limit value at which the U}ς terminal voltage of the battery equals the ignition - threshold voltage UJJ at maximum revolution. The above considerations neglect the increase of the starting current resulting in the value I _ma which increase is due to the cold state of the engine oil. At the starting of an engine not reaching the operation temperature even in ideal situation the voltage value UJJ is reached only after about the third revolution of the main axle. In the absence of ignition, the sucked ixture will escape into the atmosphere polluting the environment.

This aim is achieved by the starter battery defined in the claims.

The aim of the invention to provide means for improving a battery to supply sufficient energy and voltage to achieve safe start of gasoline operated Otto-motors even at extremely cold conditions.

The invention will be described with reference to the drawings wherein:

Fig. 1 shows diagrams characterizing the operation of a battery loaded by a starter motor, i.e. the functions of battery voltage and rotational speed versus electric current, Fig. 2 shows a perspective view with insight into the structure of the invented battery, Fig. 3 shows a sectional view of a cell of the invented battery, Fig. 4 shows an elevational view of the battery cell according to Fig. 3, partly in section, Fig. 5 is a diagram of the eletronic switching circuit. The starter battery of Fig. 2 is constructed by the practical usage of plastic elements and comprises four main structural parts: a container 11, a container cover 12, a plurality of battery monocells 9, and electrical switching unit 6.

The container 11 is prepared from suitably chosen hard plastic - different from the traditional battery container,

comprising six compartments - without any internal partition walls.

Considering the front part excisions are formed on the sidewall 1 for holding the acid level indicator extensions of the monocells. The function of the container is limited to hold a plurality of monoblocks 9 to form a compact structural unit and ensure the possibility of building the control and the switching elements through the covered top.

A cover lid 12produced from hard plastic is covering the container 11 and it contains said electronic switching unit 6 including a connecting plate, the holes 5 for filling the monoblocks and the universally connectable cable connector 4.

The monocells 9 on Figs. 3 and 4 form the basic main structural unit of the invented battery. Said monocells show a double action.

The monocells 9 are preferably produced from translucent PVC by injection moulding. Said monocells contain two, from electrical point of view, independently operatable battery units with a structure enabling common hydraulic handling the two batteries included (filling, refilling, etc.). The mono- cells comprise two main elements, that is: a basic cell and a combined cell-cover.

The extended portion 1 formed on the front side of the monocell allows checking the acid level and the electric charge situation of the battery, in such a way that the balls of different colour and density placed into it will have a position corresponding to both the charge and the acid level.

This part of the containing basic box is formed specially created for this purpose and makes the checking of the acid level and charge of the monocell independently possible, without using any measuring instruments, and even during operation. Negative and positive lattice plates 10 are built into the basic cells. The plates 10 are insulated from each other on the two sides with grilled or groved plates, surrounding the positive plates like a bag thereby, preventing the intensive formation of slurry. According to the dimensions of the lattice plates and the separators, 7 positive and 8

negative plates 10 can be built into one monocell (type: K- 15) .

The special placement of the positive and the negative terminals 7, 8 enables an asymmetric plate-terminal arrangement, and as a result it is possible to combined covering lid box portion containing the auxiliary battery into the container. The plate holding ridges formed at the bottom of the cell boxes ensures the space for the slurry, since the separator plates - despite the shielded welding - as a result of vibration, can sift off granules smaller than 2 microns during adverse situation. The covering of the basic cell is achieved by the combined cover lid 12 which includes the auxiliary battery unit containing special, axially shifted "bucket" and the filling opening 5 that guarantees the hydraulic handling. The "bucket" guaranteeing the separate building of the auxiliary battery 2 is made such that using a floating ball-row indicator placed into its protruding portion allows supervision of the acid level and charging of the auxiliary battery similarly to that of the main battery. The capacity of the auxiliary battery is approximately lAh and contains three positive and four negative plates 2. Six monocells are placed at the same time into the battery container. The advantage of this type of arrangement is that the cells can be manufactured with unprecedented accuracy with bulk manufacturing. The bursting of the plastic monocell is virtually ruled out, and its possibility can be optically observed with the help of the floating ball indicator 1 used for supervising the acid level. However, when necessary, the monocells can be replaced after removing the binding lead- bridges 3. The use of monocell structure rules out the possibility of the otherwise frequently experienced cell faults of traditional batteries. Should there be cell fault, the cell can be replaced within a short time (max. 15 minutes) . The monocell can be mounted in the place of the faulty one in filled and electrically charged state, this way it can be put in service immediately, there is no need to replace the whole battery.

The cells of the auxiliary battery can be connected in

series (Un = 8 V) or in 2 pieces of 4V subunits - in parallel connection (Un = 4V) . The auxiliary battery is in serial connection during charging and in parallel connection during starting. An automatic swith-over is achieved by the semi¬ conductor elements of the electronic circuit built on top of the cover.