JPH09259937A - Method and device for preheating secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To directly preheat inside a battery, properly hold an internal temperature as easily as possible and prevent decreasing of a battery function due to a temperature decrease, by carrying an AC current between opposed electrodes of the secondary battery, and heating a battery internal resistance element. SOLUTION: Between opposed output electrodes 11a, 11a of a set battery 11 comprising a plurality of secondary batteries, a charging terminal 12a connected to a charger 13 and an external charging circuit 12 are utilized, through a controller 17 from an external AC power source 14, an AC current is carried. Here, an output voltage value of the set battery 11 is measured in a detector 15, in the point of time this measured value leads to a prescribed value, a control signal (a) is oscillated, the current carrying is preferably interruption controlled. In this way, an inside of the individual battery is efficiently mutually uniformly preheat adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preheating method and a preheating device for a secondary battery, and more particularly to an improvement of a preheating method and a preheating device in an assembled battery in which a plurality of secondary batteries are connected in series or in parallel. It is a thing.

[0002]

2. Description of the Related Art Generally, in this type of secondary battery,
Due to its configuration, when the internal temperature of the electrolytic cell decreases due to the influence of the ambient temperature (outside temperature), the mobility of ions in the electrolytic solution to obtain the desired electromotive force gradually deteriorates, which also causes the battery function. It is also known to gradually decrease.

As a countermeasure against this, conventionally, for example, when the secondary battery is used as a direct current power source in a cold region, a means for keeping the secondary battery appropriately from the external environment or a device around the battery is provided. A means for preheating is taken by a heating device such as an electric heater, which is
The same operation is performed at the time of function recovery by recharging the secondary battery whose battery function has deteriorated due to discharge.

[0004]

However, the former heat retention means for maintaining the internal temperature of the conventional secondary battery is relatively effective as a short-term measure, but is not effective for a long time. Again, it is difficult to completely avoid the decrease in internal temperature, and it cannot be called a fundamental solution.

On the other hand, in the latter preheating means using the heating device, there is an unfavorable problem that the structure of the battery system itself becomes unnecessarily complicated by the attached heating device and its control device.

The present invention has been made in view of such conventional circumstances,
In order to solve these problems, the purpose is to preheat the secondary battery so that the internal temperature of the secondary battery can be appropriately maintained by the simplest possible means, and It is to provide a preheating device.

[0007]

In order to achieve the above object, a method of preheating a secondary battery and a preheating device according to the present invention are such that an alternating current for preheating is passed between electrodes of the secondary battery. Thus, the internal temperature of the secondary battery is effectively and satisfactorily preheated.

Here, as one means for appropriately preheating the internal temperature of the secondary battery, for example, each counter (output)
When a direct current is applied between the electrodes, accompanying the application of the direct current, ions are unnecessarily received and discharged at the interface of each electrode, resulting in a large energy loss, or deterioration of the battery material. However, in the case where an alternating current for preheating is passed between the opposing (output) electrodes as in the present invention, there is a possibility that it will occur. Since almost all is converted into heat energy, it is very efficient as a preheating means.On the other hand, in the case of an assembled battery in which a plurality of secondary batteries are connected in series, even if the internal batteries are connected to each other, Even if there is temperature variation, the lower the temperature, the greater the internal resistance and the greater the amount of heat generated inside the battery. Therefore, the temperature inside each battery will be equal to each other. Extremely effective for preheating adjustment Is a basis.

According to the first aspect of the present invention, an alternating current for preheating is passed between the counter electrodes of the secondary battery to heat the internal resistance element of the secondary battery to directly preheat the inside of the battery. The method for preheating a secondary battery is characterized by

According to the first aspect of the present invention, with the passage of an alternating current between the counter electrodes of the secondary battery, the inside of the secondary battery is directly preheated by the resistance element existing inside, and the desired Preheating effect is achieved.

According to a second aspect of the present invention, in the method for preheating a secondary battery according to the first aspect, the passing of an alternating current for the preheating measures an output voltage value of the secondary battery. The shutoff control is performed when the output voltage value reaches a predetermined value.

According to the second aspect of the present invention, when the output voltage value of the secondary battery reaches a predetermined value and preheating is no longer required, energization of the alternating current for preheating is automatically cut off.

According to a third aspect of the present invention, there is provided a device for directly preheating the inside of the secondary battery by passing an alternating current for preheating between opposing electrodes of the secondary battery. A preheating device for a secondary battery, characterized in that an alternating current supplying means for supplying the alternating current through a battery circuit or a charging circuit of the secondary battery is provided.

In the present invention of claim 3, an alternating current for preheating is passed through the battery circuit or the charging circuit of the secondary battery by the alternating current conducting means, and heat generation of the resistance element existing inside the secondary battery. The inside is directly preheated by this, and the desired preheating effect is achieved.

According to a fourth aspect of the present invention, in the secondary battery preheating device according to the third aspect, the output voltage value of the secondary battery is measured and the output voltage value reaches a predetermined value. It is characterized in that a detecting means for outputting a detection signal at the time point is provided, and the energization of the alternating current can be interrupted by the detection signal.

In the invention of claim 4, when the output voltage value of the secondary battery reaches a predetermined value and preheating is no longer required by the detection means, energization of the alternating current is automatically cut off. It

The invention according to claim 5 of the present invention is a device for directly preheating the inside of the secondary battery by passing an alternating current for preheating between opposing electrodes of the secondary battery, Energizing current value control means for connecting a variable resistor in the battery circuit or charging circuit of the secondary battery, arranging the variable resistor inside the battery housing, and controlling the energizing current value of the alternating current. And a heating amount of the variable resistor can be adjusted by the energization current value control means.

According to the invention of claim 5, since the variable resistor inserted and connected in the battery circuit or the charging circuit of the secondary battery is arranged inside the battery housing, the variable resistor is connected through the variable resistor. The inside of the battery is preheated by the heat generated by the energization of the alternating current, and the amount of heat generation is arbitrarily adjusted by controlling the energizing current value of the alternating current by the energizing current value control means.

According to a sixth aspect of the present invention, in the preheating device for a secondary battery according to the fifth aspect, the output voltage value of the secondary battery is measured, and the output voltage value reaches a predetermined value. A detection means for outputting a detection signal at the time point is provided, and the conduction of the alternating current to the variable resistor can be interrupted by the detection signal.

In the present invention of claim 6, when the output voltage value of the secondary battery reaches a predetermined value by the detection means and preheating is not required, an alternating current for preheating the variable resistor is obtained. The power supply to is automatically cut off.

According to a seventh aspect of the present invention, in the preheating device for a secondary battery according to any one of the first to sixth aspects, the secondary battery is an assembled battery formed by combining a plurality of secondary batteries. It is characterized by being.

According to the invention of claim 7, as the alternating current for preheating is passed between the electrodes opposite to each other of the assembled battery, the inside of the assembled battery is directly preheated by the heat generated by the resistance element existing inside the assembled battery. , The desired preheating effect is achieved.

The invention according to claim 8 of the present invention is the preheating device for a secondary battery according to any one of claims 1 to 7, wherein the secondary battery is an on-vehicle secondary battery for driving an electric vehicle. It is what

According to the present invention of claim 8, when the alternating current for preheating is applied between the opposing electrodes of the vehicle-mounted secondary battery, the internal heat is generated by the resistance element existing inside the vehicle-mounted secondary battery. Is directly preheated to achieve the desired preheating effect.

According to a ninth aspect of the present invention, in the preheating device for a secondary battery according to the first to seventh aspects, the secondary battery is connected in parallel with an external charging circuit and the external charging circuit. A vehicle-mounted secondary battery for driving an electric vehicle, which comprises an internal charging circuit for rectifying a generated alternating current of an in-vehicle AC generator to a DC current, wherein the in-vehicle AC generator generates the generated AC current. It is characterized in that a preheating circuit for directly energizing the in-vehicle secondary battery as an alternating current for preheating is provided.

According to the present invention, the on-vehicle secondary battery is energized by the passage of an alternating current for preheating through the preheating circuit from the on-vehicle AC generator between the opposing electrodes of the on-vehicle secondary battery. Due to the heat generated by the resistance element existing inside the inside, the inside is directly preheated, and the desired preheating action is achieved without the need to supply an alternating current for preheating from the outside at all.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a preheating method for a secondary battery and a preheating device according to the present invention will be described below with reference to FIGS. 1 and 2.

First, a case where the present invention is applied to a general battery will be described as an embodiment of the present invention. FIG.
FIG. 1 is a block diagram schematically showing a schematic configuration to which an embodiment of a secondary battery preheating device according to the present invention is applied.

In the device configuration according to the embodiment shown in FIG. 1, a secondary battery of a known mode, here, a plurality of secondary batteries are combined together, and output from opposite (output) electrodes 11a and 11a at both ends. The charging terminal 12a, 12a as the external charging circuit 12 is taken out to the assembled battery 11 of the known mode that takes out the electric current, and the charging terminal 12a, 12a is taken out as necessary with respect to these charging terminals 12a, 12a. The external charger 13 can be connected, and an AC current having a required current value for preheating can be separately supplied from the external AC power source 14 to the charging terminals 12a, 12a.

Therefore, in the case of the present embodiment, when the assembled battery 11 is energized with an alternating current from the external AC power source 14, the internal resistance element generates heat due to the structure and function of the assembled battery 11. However, even if the inside of the battery pack 11 can be directly heated, and the assembled battery 11 itself cannot perform the battery function sufficiently due to cooling due to a decrease in ambient temperature (outside air temperature, etc.), its function It can recover well, and is a very effective preheating method although it is an extremely easy and simple method.

Further, in the present embodiment, as a first mode example, the output voltage value is measured and monitored between the output electrodes 11a, 11a of the assembled battery 11 to bring the output voltage value to a predetermined value. A detector 15 that outputs a detection signal a when the battery function is reached, in other words, when the battery function is restored, is provided, and the detection signal a of the detector 15 causes the external AC power supply 14 to operate.
Therefore, the AC current applied to the charging terminals 12a, 12a can be appropriately energized / interrupted, and if necessary, the energization / interruption can be appropriately externally displayed.

Therefore, in the case of the first embodiment, the preheating AC current applied to the assembled battery 11 from the external AC power source 14 can be turned off in accordance with the recovery of the battery function. Unnecessary preheating of the battery 11 can be easily prevented.

Further, in the present embodiment, as a second form example, the variable resistor 16 is connected in the battery circuit or the charging circuit of the assembled battery 11, and then the variable resistor 16 is connected.
Is provided inside the battery housing 11b, and an appropriate controller 17 for controlling the current value of the AC current supplied from the external AC power supply 14 is provided, and the variable resistance is controlled by the controller 17 by controlling the supplied current value. The calorific value of 16 can be adjusted appropriately.

Therefore, in the case of the second embodiment, since the heat generation amount of the variable resistor 16 can be adjusted by the controller 17, the battery pack 11 can always be appropriately preheated. Of.

Next, as another embodiment of the present invention, a case where the present invention is applied to an on-vehicle battery for driving an electric vehicle will be described. FIG. 2 is a block diagram schematically showing a schematic configuration of another embodiment of the secondary battery preheating device according to the present invention. In the configuration of the apparatus of another embodiment shown in FIG. 2,
The same reference numerals as those in the configuration of the apparatus according to the embodiment of FIG. 1 denote the same or corresponding portions.

Also in the apparatus configuration according to the other embodiment shown in FIG. 2, a vehicle-mounted secondary battery for driving an electric vehicle of a known mode, here, a plurality of secondary batteries are combined together, and both ends face each other ( Output) electrodes 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21c
a is taken out, and these charging terminals 22a, 2
An external charger 13 can be connected to 2a as required, as described above.

On the other hand, with respect to the on-vehicle assembled battery 21, there is arranged a rectifier 25 which is connected in parallel to the external charging circuit 22 and rectifies the AC current generated by the on-vehicle AC generator 24 into a DC current. The charging circuit 23 is connected in parallel with the external charging circuit 22, and here, separately,
A preheating circuit 26 for directly energizing the in-vehicle assembled battery 21 with an alternating current generated by the in-vehicle AC generator 24 via a switch 27 is provided, and the in-vehicle AC generator 24 passes the preheating circuit 26 through the preheating circuit 26. An alternating current having a required current value for preheating can be applied to the terminals 22a, 22a.

Therefore, in the case of the other embodiments, the in-vehicle assembled battery 21 is supplied with an alternating current from the in-vehicle AC generator 24, so that the in-vehicle assembled battery 21 is again constructed and functioned as follows. The resistance element existing inside heats up and can directly heat the inside, and even if the ambient environment temperature (outside air temperature, etc.) is lowered without the need of energizing an alternating current from the outside. Even when the on-vehicle assembled battery 21 itself cannot sufficiently perform its battery function due to cooling, it is possible to satisfactorily recover its function, and as a preheating method, it is an extremely easy and simple method. It is very effective.

Here, also in the case of this other embodiment, the first and second embodiment examples in the case of the above-mentioned one embodiment can be easily applied, and the same or substantially the same action and effect can be obtained. You can get it.

[0040]

As described above in detail with reference to the embodiments, according to the method for preheating a secondary battery according to claim 1 of the present invention, the alternating current between the counter electrodes of the secondary battery With the energization, the inside of the resistance element existing inside is directly heated by the heat generation of the resistance element, and the desired preheating action can be obtained very easily.

According to the method for preheating a secondary battery according to claim 2 of the present invention, when the output voltage value of the secondary battery reaches a predetermined value and preheating is no longer required, an alternating current for preheating is provided. It is possible to automatically cut off the energization of.

According to the preheating device for a secondary battery of the third aspect of the present invention, an alternating current for preheating is passed through the battery circuit or the charging circuit of the secondary battery and is present inside the secondary battery. The inside of the resistance element is directly heated by the heat generated by the resistance element, and the desired preheating effect can be obtained very easily.

According to the preheating device for a secondary battery of claim 4 of the present invention, when the output voltage value of the secondary battery reaches a predetermined value and preheating is no longer required, an alternating current for preheating is provided. It is possible to automatically cut off the energization of.

According to the preheating device for a secondary battery of the fifth aspect of the present invention, the variable resistor inserted and connected in the battery circuit of the secondary battery or the circuit of the charging circuit is disposed inside the battery housing. Therefore, the inside of the battery can be appropriately preheated by the heat generated by the energization of the alternating current for preheating through the variable resistor, and the energizing current value control means can change the energizing current value of the alternating current for preheating. It can be controlled and the amount of heat generation can be adjusted arbitrarily.

According to the secondary battery preheating device of the sixth aspect of the present invention, when the output voltage value of the secondary battery reaches the predetermined value and the preheating is no longer required by the detecting means,
It is possible to automatically cut off the application of alternating current for preheating the variable resistor.

According to the preheating device for a secondary battery according to claim 7 of the present invention, the resistance existing inside the assembled battery due to the passage of the alternating current for preheating between the electrodes opposed to each other at both ends of the assembled battery. The inside of the element is directly preheated by the heat generated by the element, and the desired preheating effect can be obtained very easily.

According to the preheating device for a secondary battery according to claim 8 of the present invention, the resistance existing inside the on-vehicle secondary battery accompanying the passage of an alternating current between the opposing electrodes of the on-vehicle secondary battery. The inside of the element is directly preheated by the heat generated by the element, and the desired preheating effect can be obtained very easily.

According to the preheating device for a secondary battery according to claim 9 of the present invention, an alternating current for preheating between the opposed electrodes of the on-vehicle secondary battery through the preheating circuit from the on-vehicle AC generator. With the energization of, the inside of the in-vehicle secondary battery is directly preheated by the heat generated by the resistance element inside, and the desired preheating effect is extremely achieved without the need to energize the outside with an alternating current. It has an excellent feature that it can be easily obtained.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a schematic configuration according to an embodiment when a preheating device for a secondary battery according to the present invention is applied to a general battery.

FIG. 2 is a block diagram schematically showing a schematic configuration according to an embodiment when a preheating device for a secondary battery according to the present invention is applied to a vehicle-mounted battery for driving an electric vehicle.

[Explanation of symbols]

 11 battery pack 11a counter (output) electrode 11b battery housing 12 external charging circuit 12a charging terminal 13 external charger 14 external AC power supply 15 output voltage detector a detection signal 16 variable resistance 17 energizing current value controller 21 vehicle-mounted battery pack 21a Opposite (output) electrode 22 External charging circuit 22a Charging terminal 23 Internal charging circuit 24 In-vehicle AC generator 25 Rectifier 26 Preheating circuit 27 Switch

Claims (9)

[Claims] 1. A secondary battery characterized in that an alternating current for preheating is passed between opposing electrodes of the secondary battery to heat the internal resistance element of the secondary battery to directly preheat the inside of the battery. Preheating method. 2. The alternating current is energized, the output voltage value of the secondary battery is measured, and the cutoff control is performed when the output voltage value reaches a predetermined value. A method for preheating a secondary battery as described above. 3. A device for directly preheating the inside of the secondary battery by passing an alternating current for preheating between opposing electrodes of the secondary battery, which is provided through a battery circuit or a charging circuit of the secondary battery. A preheating device for a secondary battery, characterized by comprising an alternating current supply means for supplying an alternating current for preheating. 4. The output voltage value of the secondary battery is measured,
4. A detection means for outputting a detection signal when the output voltage value reaches a predetermined value is provided, and the conduction of the alternating current for the preheating can be interrupted by the detection signal. The preheating device for the secondary battery according to. 5. A device for directly heating the inside of a secondary battery by passing an alternating current for preheating between opposing electrodes of the secondary battery, comprising a battery circuit or a charging circuit of the secondary battery. A variable resistor is connected in the circuit, the variable resistor is arranged inside the battery housing, and a conducting current value control means for controlling a conducting current value of the alternating current is provided, and the conducting current value control means is used. A preheating device for a secondary battery, wherein the heat generation amount of the variable resistor can be adjusted. 6. The output voltage value of the secondary battery is measured,
A detecting means for outputting a detection signal at the time when the output voltage value reaches a predetermined value is provided, and the detection signal can interrupt the supply of an alternating current for preheating to the variable resistor. The preheating device for the secondary battery according to claim 5. 7. The preheating device for a secondary battery according to claim 1, wherein the secondary battery is an assembled battery formed by combining a plurality of secondary batteries. 8. The preheating device for a secondary battery according to claim 1, wherein the secondary battery is an on-vehicle secondary battery for driving an electric vehicle. 9. The electric vehicle, wherein the secondary battery comprises an external charging circuit and an internal charging circuit connected in parallel to the external charging circuit to rectify the alternating current generated by the on-vehicle AC generator into a direct current. A vehicle-mounted secondary battery for driving, wherein the vehicle-mounted AC generator is provided with a preheating circuit for directly supplying the generated AC current to the vehicle-mounted secondary battery as an AC current for preheating. A preheating device for a secondary battery according to claim 1.