CS259813B1 - Equipment for accumulator heating - Google Patents

Abstract

A device for heating batteries using heat generated by passing alternating current through an electrochemical system of batteries, the essence of which is that an alternating current source, for example a secondary coil of a transformer, is connected between the common poles of starter batteries connected in two parallel branches, connected to one of the appliance inlets, while the other common poles of the batteries are interconnected and connected to the vehicle chassis. A system of parallel branches of batteries can also be created for heating purposes by connecting the positive and negative sides of the battery systems of two or more vehicles or autonomous machines, for example using connectors, while one side is connected via an alternating current source, for example a secondary coil of a transformer.

Description

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for heating accumulators with an AC power source, the output of which is connected to the terminals of the accumulators.

At temperatures below –30 ° C, the battery needs to be warmed up before starting vehicles and autonomous machines, since at these temperatures the battery is not only able to give a fraction of its power and performance, but the charging process is virtually ineffective.

Of the many possibilities of heating under these conditions, heating by alternating current through the electrochemical accumulator system is known and very advantageous, since heat is generated directly in the electrode pores and in the inter-electrode space where heat is critical. There is no need to heat any other media and high heating rates can be achieved. In practice, this heating is generally carried out by switching two accumulators connected in series for the heating time with the same poles to each other and connecting a coil of a low-voltage AC power source, for example a secondary coil of a transformer, to the opposite (same) poles. Alternatively, a relatively complex circuit may be used which requires the use of at least four or more accumulators or capacitor batteries.

The disadvantage of this method of heating is the necessity to include in the battery circuit a relatively complicated robust switch, which flows through both starting and heating the batteries. It is a source of additional resistance and is a risk factor especially when starting.

It is an object of the invention to make it possible by simple arrangement to heat the battery with alternating current without using auxiliary switching elements in the starter circuit.

SUMMARY OF THE INVENTION An AC source, such as a secondary transformer coil, connected to a consumer supply is connected between one of the common poles of the accumulators connected to two parallel branches, wherein the second common poles of the accumulators are interconnected and connected to the vehicle or machine frame. . The system of parallel accumulator branches can be created for heating purposes by connecting both positive and negative sides of accumulator systems of two or more vehicles or autonomous machines, for example by means of connectors,

Claims (2)

Device for heating accumulators with an AC power supply, the output of which is connected to the battery terminals, characterized in that the AC power supply, connected to one supply of appliances (4), is connected between one common pole of starter batteries (1) connected to two one side is connected via an AC power source, such as a secondary transformer coil. An advantage of the device according to the invention is the possibility to carry out alternating current heating without the use of auxiliary switching elements in the starter circuit, which increase the risk of failure while at the same time eliminating the inconvenient handling of these switching elements. The battery heating device according to the invention is shown schematically in FIG. 1. Giant. 2 schematically shows the connection of accumulators of two vehicles by means of connectors to a device according to the invention. In FIG. 1, the starter accumulators 1 are arranged in two parallel branches. The positive poles of the starter batteries 1 are connected via the transformer coil's secondary coil 3 to the supply lead of the consumer 4. The negative poles of the starter batteries 1 are connected to the vehicle frame 2. Appliances 4 can be connected to any point of the circuit between the positive poles of both parallel branches, but the most preferred point of connection is in the middle of the secondary coil of the transformer 3. Fig. 2 shows an example of a similar arrangement, where two parallel branches of the accumulator 1 were formed by connecting both positive and negative sides of identical battery systems of two vehicles, respectively. autonomous machines. Connectors 5 are used for direct connection of vehicle or machine frames 2 and for connecting the secondary coil of the transformer 3 as a source of alternating current between the positive poles of both battery systems. The connection of appliances 4 does not require any modifications in this case. assumes group deployment of vehicles or mobile machines. The polarity of the on-board power supply system to the vehicle or machine frame does not matter. The secondary coil of the transformer 3 can be connected both on the connection side of the appliances 4 and on the connection side of the vehicle or machine frame 2. The device according to the invention can be used in vehicles and mobile machines operating at low temperatures. It has been verified that in this way the batteries can be heated from -50 ° C to +10 ° C in five minutes. The second common poles of the batteries are interconnected and connected to the vehicle body (2). Device for heating accumulators according to claim 1, characterized in that the common poles of the starting accumulators (1j) are connected by means of connectors (5).