JPH09294338A - Battery apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery apparatus capable of removing the bad influence of a malfunction appropriately, when the conditions of its unit batteries are monitored and this malfunction is detected. SOLUTION: Each unit battery 11-1 , 11-2 ,..., 11-n is composed of one battery 12-1 , 12-2 ,..., 12-n and a by-pass wire 13-1 , 13-2 ,..., 13-n arranged in parallel independently. And adjoining unit batteries 11-1 , 11-2 ,..., 11-n are connected in series through switching devices 14-1 , 14-2 ,..., 14-n , and a part of the batteries 12-1 , 12-2 ,..., 12-n detected as malfunctioning is switched off with the switching devices 14-1 , 14-2 ,..., 14-n so as to connect adjoining unit batteries with a by-pass wire 13-1 -13-n .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery device, and is particularly useful when applied to an electric vehicle.

[0002]

2. Description of the Related Art An electric vehicle such as an automatic guided vehicle is a vehicle that travels using an electric motor driven by a battery as a drive source.

9A and 9B are explanatory views conceptually showing a battery device 1 according to the prior art together with an inverter 2 and an electric motor 3. As shown in the figure, the output terminals 1a and 1b of the battery device 1 are connected to the inverter 2 so as to supply DC power, and the AC power converted by the inverter 2 is supplied to the electric motor 3. is there.

Here, the battery device 1 is a unit battery 1
_-1 , 1, _-2 , ..., 1- _n are connected in series (Fig. 9
(A)), or a plurality of such serially connected columns are connected in parallel (two columns in the drawing) (FIG. 9 (b)).

[0005]

The battery device 1 as described above has the following problems. (1) In the case shown in FIG. 9A, if one unit battery 1 _-1 , 1 _-2 , ..., 1 _-n has an abnormality due to simple series connection, the abnormality spreads to the whole. , The normal unit batteries 1 _-1 , 1 _-2 , ..., 1 _-n are also made abnormal.

(2) As shown in FIG.
If you continue, it will be difficult to increase the voltage and the current value
To increase. Also, if you try to increase the voltage, the unit battery
Li 1 _-1 , 1_-2 , ..., 1_-nLimited number due to increased number of
It exceeds the space.

(3) Individual unit batteries 1 _-1 , 1 _-2 ,
..., by variation of 1 _-n characteristics, the unit battery 1 _-1 by charging, 1 _-2, ..., which may degrade the 1 _-n. That is, when charging is started based on a certain capacity, the unit batteries 1 _-1 , 1 _-2 , ...
1- _n is overcharged. As a means for solving this, it is possible to prepare a charger for each unit battery 1 _-1 , 1 _-2 , ..., 1 _-n to charge the battery, but there are new problems such as increase in cost and installation space. Occur.

In view of the above-mentioned prior art, the present invention aims at providing a battery device capable of appropriately removing the adverse effects of the unit batteries by monitoring the states thereof and detecting abnormalities or overcharging. And

[0009]

The structure of the present invention for achieving the above object is characterized by the following points.

1) A unit battery is constituted by one battery and a bypass line which is arranged independently in parallel with the unit battery, and adjacent unit batteries are sequentially connected in series via a switch means, and abnormalities of each battery occur. And a battery monitoring means for detecting the abnormality. When the battery monitoring means detects an abnormality of the battery, the unit battery having the battery is switched by the switch means so as to be connected to the adjacent unit battery via the bypass line. What I did.

2) A unit battery is constituted by one battery and a bypass line which is independently arranged in parallel with the battery, and adjacent unit batteries are sequentially connected in series via a switch means and each battery is charged. A battery monitoring unit for detecting the state is provided, and when the battery monitoring unit detects the completion of charging of the battery, the unit battery having the battery is switched by the switch unit so as to be connected to the adjacent unit battery via the bypass line. Configured to.

3) A unit battery is constituted by one battery and a bypass line which is arranged independently in parallel with the unit battery, and adjacent unit batteries are sequentially connected in series via a switch means and each battery is abnormal. And a battery monitoring means for detecting the state of charge, and when this battery monitoring means detects an abnormality or completion of charging of the battery, the unit battery having the battery is switched so as to be connected to the adjacent unit battery via a bypass line. It is configured to be switched by means.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory view showing a unit battery in this embodiment. As shown in the figure, the unit battery 11 has one battery 12 and a bypass line 13 arranged in parallel with the battery 12 independently.

As shown in FIG. 2A, the battery device I
Is a plurality of the unit batteries 11_-1 , 11_-2 , ..., 11_-n
Switch devices 14 that are adjacent to each other_-1 , 14_-2
 , ..., 14_-nIt is configured to be connected in series in sequence via.
The battery monitoring device 15 uses the unit battery 11_-1 , 11_-2
 , ..., 11_-nEach battery 12_-1 , 12_-2 , ..., 12 _-n
State, that is, each battery 12_-1 , 12_-2 , ..., 12
_-nThe abnormalities and the charging end status of the
And each battery 12_-1~ 12_-nSent from
Battery status signal S₁, S_Two,…, S_nProcessing
To detect. As a result, abnormal or charging end status is detected.
Abnormality / charging end signal S if known ₁₁Switchco
It is sent to the controller 16. Switch controller 16
Then, according to each mode, the switch device 14_-1~ 14_-nTo
Control. Each mode at this time is predetermined.

That is, as shown in FIG. 2B, each of the switch devices 14 _{-1 to} 14 _-n has the same structure, but each has four contacts a, b, c, d. Normally, the contacts (a, b) are connected to each other and the other contacts c and d are opened (first mode), and when abnormality of the batteries 12 _{-1 to} 12 _-n or termination of charging is detected. , The other contacts (a, d) are opened (second mode) by connecting the contacts (b, c) as required, or the other contacts (b) are connected by connecting the contacts (a, d). , C) are opened (third mode), or the contacts (c, d) are connected and the other contacts (a, b) are opened (fourth mode).

FIG. 3 shows a state of the battery device I during normal operation. As shown in the figure, in this case, the switch devices 14 _{-1 to} 14 _-n are all in the first mode, and all the batteries 12 _{-1 to} 12 connected in series are connected.
The voltage of _-n is superimposed and becomes the output voltage of the battery device I.

FIG. 4 shows the battery 12 of the battery device I.
If an abnormality is detected in _-1, 5 respectively state when the battery 12 _-1 of the battery I, abnormal _12-2 is detected. In the case shown in FIG. 4, the switch device 14 _{-1 is set} to the third mode and the switch device 14 _{-2 is set} to the second mode so as to bypass the battery 12 _-1 in which the abnormality is detected, and the bypass line 13 _-1 is connected. Through the switch device 14
The connection between _-1 and 14 _-2 is secured. In the case shown in FIG. 5, the switch device 14 _{-1 is set} to the third mode, the switch device 14 _{-2 is set} to the fourth mode, and the switch device 14 _-2 is set to bypass the batteries 12 _-1 , 12 _-2 in which the abnormality is detected. 14 _{-3 is set} to the second mode, and the connection between the switch devices 14 _-1 , 14 _-2 , 14 _-3 is secured via the bypass lines 13 _-1 , 13 _-2 .

When the batteries 12 _{-1 to} 12 _-n are charged, the switch devices 14 _-1 to 1 are exactly the same as when the abnormality is detected as described above.
Control 4- _n . That is, the batteries 12 _{-1 to} 12 _-n in which the completion of charging is detected are sequentially disconnected, and this portion uses the bypass lines 13 _{-1 to} 13 _-n to connect the adjacent unit batteries 11 _{-1 to} 11 _-n. All you have to do is secure.

FIG. 6 is an explanatory view showing the connection state of the battery device I at the start of charging, which corresponds to the mode shown in FIG.
FIG. 7 is an explanatory diagram showing the connection state when the battery 12 _-1 is in the charging completed state, and corresponds to the mode shown in FIG. FIG. 8 is an explanatory diagram showing a connection state in which the batteries 12 ₋₁ and 12 ₋₂ are in a charging completed state, and corresponds to the mode shown in FIG.

In the above embodiment, the battery monitoring device 15 is configured to detect the abnormality of each of the batteries 12 _{-1 to} 12 _-n and the completion of charging, but it is of course possible to detect only one of them. good.

[0022]

As described above in detail with the embodiments, the present invention has the following effects.

1) By preventing energization of an abnormal battery, the normal battery is not adversely affected,
It is possible to extend the battery life.

2) Early detection of an abnormal battery improves maintenance efficiency.

3) Overcharging due to variations in battery characteristics can be carried out by switching the switching device and charging according to each battery.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a unit battery according to an embodiment of the present invention.

FIG. 2 is a block diagram (a) showing a battery device according to an embodiment of the present invention together with an inverter and an electric motor, and an explanatory diagram (b) conceptually showing a switch device thereof.

FIG. 3 is a block diagram showing a connected state of the battery device according to the above embodiment during normal operation.

FIG. 4 is a block diagram showing an example of a connection state of the battery device when an abnormality occurs in a battery.

FIG. 5 is a block diagram showing another example of the connection state of the battery device when an abnormality occurs in the battery.

FIG. 6 is a block diagram showing a connection state of the battery device during battery charging.

FIG. 7 is a block diagram showing an example of a connection state of the battery device when there is a fully charged battery.

FIG. 8 is a block diagram showing another example of a connection state of the battery device when there is a fully charged battery.

9A and 9B are explanatory views conceptually showing a conventional technique, in which FIG. 9A shows a series connection and FIG. 9B shows a parallel connection.

[Explanation of symbols]

I the battery device 11, 11 _-1, 11 _-2, ..., 11 _-n unit batteries 12, 12 _-1, 12 _-2, ..., 12 _-n battery 13 _-1, 13 _-2, ..., 13 _{- n} bypass line 14, 14 _-1 , 14 _-2 , 14 _-3 , ..., 14 _-n switch device 15 battery monitoring device 16 switch controller a, b, c, d contact

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H02J 7/00 H02J 7/00 S

Claims (3)

[Claims] 1. A unit battery is constituted by one battery and a bypass line which is independently arranged in parallel with the unit battery, and adjacent unit batteries are sequentially connected in series through a switch means and each battery is abnormal. And a battery monitoring means for detecting the abnormality. When the battery monitoring means detects an abnormality of the battery, the unit battery having the battery is switched by the switch means so as to be connected to the adjacent unit battery via the bypass line. A battery device characterized by the above. 2. A unit battery is constituted by one battery and a bypass line which is arranged independently in parallel with the unit battery, and adjacent unit batteries are sequentially connected in series via a switch means and each battery is charged. A battery monitoring unit for detecting the state is provided, and when the battery monitoring unit detects the completion of charging of the battery, the unit battery having the battery is switched by the switch unit so as to be connected to the adjacent unit battery via the bypass line. A battery device having the above-mentioned configuration. 3. A unit battery is constituted by one battery and a bypass line which is arranged independently in parallel with the unit battery, and adjacent unit batteries are sequentially connected in series via a switch means and abnormalities of each battery are provided. And a battery monitoring means for detecting the state of charge, and when this battery monitoring means detects an abnormality or completion of charging of the battery, the unit battery having the battery is switched so as to be connected to the adjacent unit battery via a bypass line. A battery device characterized in that it is configured to switch by means.