JPH1027631A - Temperature measuring device for secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature measuring device for a secondary battery which can surely grasp an arranging condition in a plurality of the secondary batteries. SOLUTION: This temperature measuring device 40 for a secondary battery, measuring a temperature range of a plurality of the arranged secondary batteries, comprises a plurality of temperature sensors 50-1 to 50-x arranged corresponding to each secondary battery to detect its temperature, temperature sensor selecting means 70 for obtaining an output corresponding to a temperature change of the secondary battery from the selected temperature sensor by selecting the temperature sensor 50-1 to 50-x corresponding to the secondary battery intended to obtain a temperature change, temperature information IS corresponding to a temperature change of the secondary battery from a temperature sensor selected in the temperature sensor selecting means 70, discrimination code information AD specifying this secondary battery and a processing means 90 for combination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery temperature measuring device for measuring a temperature change of a secondary battery such as a plurality of lithium ion batteries.

[0002]

2. Description of the Related Art As a secondary battery, for example, a lithium ion battery has a negative electrode made of a carbonaceous material capable of doping and undoping lithium, a positive electrode made of a composite oxide of lithium and a transition metal, and a nonaqueous solution obtained by adding an electrolyte to a nonaqueous solution. It is a non-aqueous electrolyte secondary battery using an electrolyte. Lithium-ion batteries are rechargeable secondary batteries, and are expected to replace conventional nickel-cadmium batteries and the like, for example, as batteries that can extend the driving time of a portable personal computer or reduce the weight if the same driving time is used. ing.

[0003]

In the process of manufacturing such a lithium ion battery, a characteristic test and performance of the manufactured lithium ion battery are performed. In this characteristic test and performance, it is necessary to charge and discharge the lithium ion battery and to perform aging. By the way, when such a charge / discharge or aging is performed and the characteristic test and the performance of the lithium ion battery are observed, it is desired to monitor the state of each lithium ion battery. In particular, when performing a charge / discharge operation or aging on a large number of lithium ion batteries, it is necessary to grasp the state of each lithium ion battery in order to confirm a characteristic test and performance. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to provide a secondary battery temperature measuring device capable of reliably grasping the state of a plurality of arranged secondary batteries.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to provide a temperature measuring device for a secondary battery for measuring a temperature change of a plurality of secondary batteries, the device corresponding to each secondary battery. A plurality of temperature sensors for detecting the temperature of each secondary battery, and a temperature sensor corresponding to the secondary battery for which a temperature change is to be obtained.
Temperature sensor selecting means for obtaining an output corresponding to the temperature change of the secondary battery; temperature information corresponding to the temperature change of the secondary battery from the temperature sensor selected by the temperature sensor selecting means; and the secondary battery is specified. By a temperature measuring device for a secondary battery including identification code information and processing means for combining,
Achieved.

[0005] In the present invention, a plurality of temperature sensors are arranged corresponding to each secondary battery, and detect the temperature of each secondary battery. The temperature sensor selecting means tries to obtain a temperature change 2
A temperature sensor corresponding to the secondary battery is selected, and temperature information corresponding to a temperature change of the secondary battery is obtained from the selected temperature sensor.

The processing means combines temperature information corresponding to a temperature change of the secondary battery from the temperature sensor selected by the temperature sensor selecting means with identification code information for specifying the secondary battery. By doing so, the processing means can easily grasp whether the secondary battery having which identification code information has a temperature change, and the operation of identifying the secondary battery having the abnormal temperature change can be reliably performed. Can be.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows a tray 2 containing a plurality of lithium ion batteries 1. The tray 2 contains a plurality of lithium ion batteries 1 arranged at predetermined intervals. Each lithium ion battery 1 has, for example, a structure as shown in FIG. This lithium ion battery 1
Includes an electrode element 3, a can 4, a terminal 5, a gasket 6, and the like as shown in FIG. The electrode element 3 is obtained by sandwiching an insulating sheet (referred to as a separator) between a positive electrode and a negative electrode and winding it up in a spiral. Reactive materials (active materials) are laminated on both the positive electrode and the negative electrode. The electrode element 3 is formed by laminating and winding a strip-shaped positive electrode, a strip-shaped separator, a strip-shaped negative electrode, and a strip-shaped separator. The electrode element 3 is housed in a can 4, and a terminal 5 and a gasket 6 are attached to the can 4, and parts such as a safety valve enter the can 4. The lithium ion battery 1 of FIG.
Thirty to three hundred are arranged in tray 2 in an orderly manner. FIG. 3 shows an example of a charging device that charges the positive electrode terminal 5 and the negative electrode terminal 7 of each lithium ion battery 1 by applying a charge. The charging device 20 includes power supply pins 21 and 22, and the pins 21 and 22 are connected to a power supply 23.

FIGS. 4 and 5 show an apparatus for measuring the temperature of a secondary battery according to the present invention. 4 and 5, the temperature measuring device 40 includes a temperature sensor group 50, a temperature sensor selecting unit 70, a processing unit 90, and the like. First, the temperature sensor group 50 includes, for example, 250 to 300 temperature sensors 50-1 to 0-x in accordance with the number of the lithium ion batteries 1 in FIG. The temperature sensors 50-1 to 50-x are arranged in a matrix, and each of the temperature sensors 50-1 to 50-x can use, for example, a thermistor.

Each of the temperature sensors 50-1 to 50-x is
Only one is selected by the temperature sensor selecting means 70,
The temperature information of the lithium ion battery 1 measured by the selected one temperature sensor can be sent to the processing means 90 side. The temperature selecting means 70 includes an interface 71, switches 72 and 73, and two selectors A and B.
The selector A can select one of the lines L1, L2, L3,. That is, the switch 72 selects one of the switches S1, S2, S3, S4... Sα of the selector A and turns it on, so that one of the plurality of lines can be selected.

Similarly, the selector B is connected to the lines R1, R
Switch T1, to select one of 2, R3.
T2, T3, and Tα. The switch 73 selects and turns on one of these switches T1 to Tα. As a result, one of the lines R1 to Rα can be selected.

For example, the central processing unit 9 of the processing means 90
3 gives a command to the switches 72 and 73 via the interface 71, and when the switch 72 turns on the switch S1 and the switch 73 turns on the switch T1, the temperature sensor 5
The temperature information of the lithium ion battery 1 obtained from 0-1 is
It can be sent to the amplifier 91 of the processing means 90.

The processing means 90 includes the amplifier 91, A /
A D converter 92, a central processing unit (CPU) 93, an interface 94 and the like are provided. The amplifier 91 amplifies the temperature information IS of the selected temperature sensor and converts it into an A / D converter 92.
Send to The A / D converter 92 converts the temperature information IS amplified by the amplifier from analog to digital, and
Send to 3. The central processing unit 93 determines a change in the digitized temperature information IS of the lithium-ion battery 1 and, if the temperature change exceeds a predetermined temperature, an abnormality in the corresponding lithium-ion battery 1 Then, the central processing unit 93 issues an abnormal signal 95. The abnormal signal 95 enables the monitor of the display unit 200 to display an abnormal state of the corresponding lithium ion battery,
At the same time, the warning unit 210 can be activated. The warning unit 210 can notify the worker of the abnormal temperature rise of the lithium ion battery by voice using a buzzer or the like, or can notify the abnormal temperature rise of the lithium ion battery by blinking a lamp or the like.

By the way, the temperature information IS is sent to the central processing unit 93 by the address information AD as the identification code information of the temperature sensor set by the selectors A and B in FIG.
Can be captured via the amplifier 91 and the A / D converter 92. Therefore, the central processing unit 93 determines which address of the lithium ion battery 1 in the display unit 200 via the interface 94 has an abnormality in the temperature information IS and the temperature of the lithium ion battery 1 is abnormal. Can be displayed reliably.

Next, how to measure the temperature change of the lithium ion battery 1 as shown in FIG. 1 using the above-described temperature measuring device will be described. When measuring the temperature of each lithium ion battery 1, the temperature sensors 50-1 through 50-1 of FIG.
-X is directly set to the pin 21 in FIG.
In FIG. 3, the setting may be indirect. In FIG. 3, one of the temperature sensors 50-1 to 50-x is connected to a pin 21.
Setting the temperature directly is called the direct temperature measurement method.
A method of indirectly contacting the temperature sensors 50-1 to 50-x with the can 4 of the battery 1 to measure the temperature of the lithium ion battery 1 is called an indirect temperature measurement method. In the present invention, either the direct temperature measurement method or the indirect temperature measurement method may be employed.

FIG. 6 shows an example of the charging, discharging and inspection steps of the lithium ion batteries 1 housed in a plurality of trays 2 in FIG. The temperature measuring device 40 of FIG. 4 and FIG.
In the steps of charge, discharge, aging, and total inspection, the temperature of each lithium ion battery 1 can be inspected when necessary.

For example, consider the case where the temperature sensors 50-1 to 50-x are directly attached to the pins 21 for measurement in FIG. In step ST1 of FIG. 6, each lithium ion battery 1 in the tray 2 of FIG. 1 is subjected to rated charging using the charging device 20 of FIG. In the inspection at step ST2 in FIG. 6, the voltage of each charged lithium ion battery 1 immediately after charging is measured.

In step ST3 of FIG. 6, aging is performed by leaving all the lithium ion batteries 1 for a certain period. In step ST4, an inspection is performed, and the final voltage is checked for all of the lithium ion batteries 1.

In the process from step ST1 to step ST4 of FIG. 6, the temperature measuring device 40 of FIGS. 4 and 5 uses the temperature sensors 50-1 to 50-x to operate the lithium ion battery of FIG. This temperature change is checked for all 1s. During the checking of the change in the temperature of the lithium ion battery, the central processing unit 93 of the processing unit 90 in FIG.
The switches of selectors A and B are sequentially selected by 2, 73. Thus, the temperature sensor detects the temperature information of the corresponding lithium ion battery 1 and the temperature information IS of the lithium ion battery 1 corresponding to the temperature sensor is sent to the amplifier 91, and the lithium ion battery 1 corresponding to the temperature sensor 50-2 is also transmitted. Address information AD of the A / D
It is sent to the converter 90.

The central processing unit 93 of the processing means 90
Is based on the temperature information IS and the address information AD obtained from the A / D converter 92, when there is a lithium ion battery 1 whose temperature change in the temperature information IS is larger than a predetermined temperature change, The unit 93 outputs an abnormal signal 95 to the display unit 200 and the warning unit 210 via the interface 94. Thereby, the display unit 200
The address of the lithium ion battery 1 corresponding to the address information AD and the temperature abnormality of the lithium ion battery 1 are displayed. Further, the warning unit 210 can warn an operator by sound or light that there is an abnormality in the temperature change of a certain lithium ion battery 1.

As described above, the temperature measuring device 4 shown in FIGS.
By using 0, even when a large number of lithium ion batteries 1 are arranged in the tray 2, temperature changes during the charging, discharging, and aging processes of each lithium ion battery as shown in FIG. 6 can be reliably grasped. be able to. Therefore, the quality of the lithium ion battery and the safety can be ensured. In FIG. 4, when the temperature information IS of each lithium ion battery is obtained, for example, when the switch 72 sequentially switches the switches S1, S2, and S3 of the selector A at a predetermined timing, the switch of the selector B It is sufficient that only T1 is turned on. When the switch 72 is turned on again as in S1, S2, S3,..., The switch T2 of the selector B is turned on. By repeating such operations, the temperature sensor 50
The temperature information IS and the address information AD can be sequentially obtained from -1 to the temperature sensor 50-x.

The present invention is not limited to the above embodiment. In the above embodiment, the temperature sensor employs a thermistor. However, the temperature sensor is not limited to this, and a thermocouple or a heat-sensing semiconductor can be used in addition to the thermistor. Further, the assembly of the switch 72 and the selector A can employ a multiplexer or the like. In any case, by reading the temperature information IS based on the voltage and resistance value of the temperature sensor in order and the address information AD obtained from the selectors A and B, it is possible to determine which lithium ion battery has a temperature abnormality. It is easy and sure. In FIG. 1, a tray is used, but the present invention is not limited to this, and other types can be employed.

The lithium ion battery in which an abnormal temperature is found is judged to be defective, and is automatically discharged by an automatic machine. A secondary battery such as a lithium ion battery is shown in FIG.
And cylindrical shapes and square shapes as shown in FIG.

[0024]

As described above, according to the present invention,
The state of the plurality of secondary batteries can be reliably grasped.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a tray on which a plurality of secondary batteries of the present invention are arranged.

FIG. 2 is an exploded perspective view showing a configuration example of a lithium ion battery.

FIG. 3 is a diagram showing a state of charging a secondary battery and a method of measuring a temperature of the secondary battery.

FIG. 4 is a diagram showing a temperature measuring device according to the present invention.

FIG. 5 is a diagram showing the temperature measuring device of FIG. 4;

FIG. 6 is a diagram showing an example of charging, discharging, and aging steps of a lithium ion battery in which temperature is measured by the temperature measuring device of the present invention.

[Explanation of symbols]

1 ... lithium ion battery (secondary battery), 20 ...
Charging device, 40: temperature measuring device, 50: temperature sensor group, 50-1 to 50-x: temperature sensor, 7
0: temperature sensor selection means, 90: processing means, I
S: temperature information, AD: identification code information (address information)

Claims (4)

[Claims] 1. A secondary battery temperature measuring device for measuring a temperature change of a plurality of secondary batteries, wherein the plurality of secondary battery temperature measuring devices are arranged corresponding to the respective secondary batteries and detect the temperature of the respective secondary batteries. A temperature sensor for selecting a temperature sensor corresponding to the secondary battery whose temperature change is to be obtained, and obtaining an output corresponding to the temperature change of the secondary battery from the selected temperature sensor Selecting means; temperature information corresponding to a temperature change of the secondary battery from the temperature sensor selected by the temperature sensor selecting means; identification code information for specifying the secondary battery; A temperature measuring device for a secondary battery, characterized in that: 2. The secondary battery temperature measuring device according to claim 1, wherein the temperature sensor measures the temperature of the secondary battery by directly contacting the secondary battery. 3. The secondary battery temperature measuring device according to claim 1, wherein the temperature sensor measures a temperature of the secondary battery by contacting a probe connected to the secondary battery. 4. The temperature measuring device for a secondary battery according to claim 1, wherein the secondary battery is a lithium ion battery.