JP2012186985A - Secondary battery degradation determination method and secondary battery degradation determination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery degradation determination method that determines whether or not and how each battery was degraded in an early stage with a simple configuration and process.SOLUTION: Battery voltage detection sections 21-2n detect voltages of a plurality of series-connected batteries BT1-BTn, respectively, and voltages V1-Vn fed into a control operation section 5 are compared with a reference voltage. Balance circuits corresponding to batteries whose voltage is higher than the reference voltage are turned on. The rate of operation of each balance circuit is stored in time series in a storage section 6. The rate of operation of each balance circuit is compared to determine that the battery corresponding to a balance circuit having a different rate of operation from other balance circuits is assumed to be degraded.

Description

  The present invention relates to a secondary battery deterioration determination method, and more particularly, to a secondary battery deterioration determination method and a secondary battery deterioration determination apparatus that can determine deterioration of a secondary battery at an early stage of deterioration.

  In recent years, lithium ion batteries have been widely used as secondary batteries.

  This lithium ion battery has very good input / output efficiency (about 98%), so that most of the charging energy is stored inside.

  On the other hand, a lithium ion battery has a property that is weaker than a high voltage (about 4.2 V), and generally has a protection circuit against overcharge pressure, overcurrent, overdischarge voltage, high temperature abnormality, etc. as a battery module. (For example, refer to cited document 1 and cited document 2).

  Recently, demand for large modules such as EVs has increased, and in addition to the protection function, as a circuit for adjusting individual battery voltages, secondary batteries connected in series are efficiently charged. A battery is connected in series, a main circuit having connection terminals at both ends of the series connection, a bypass circuit (balance circuit) connected in parallel to each secondary battery, and a resistor and a switch connected in series, and each two A measurement control circuit for measuring the voltage of the secondary battery and controlling on / off of the switch, and supplying a constant charge current or a discharge current between the end terminals of the main circuit, and the voltage of each secondary battery. Is disclosed, and a secondary battery charging / discharging device that adjusts charging / discharging of the secondary battery is disclosed (see, for example, Patent Document 3).

JP 2006-210120 A JP 2003-284237 A Japanese Patent No. 3517844

The above-described battery protection device described in Patent Document 1 can be used to protect overcharge, overdischarge, etc., and the secondary battery charge / discharge device disclosed in Cited Document 3 provides information on overcharge, overdischarge, etc. Even so, it is difficult for these devices to detect the very slow deterioration occurring inside the battery.

  For example, even if a small leak occurs inside the battery and the voltage of the battery decreases little by little, it is very difficult to understand that a gradual leak is occurring even if the voltage automatic balance function works and is measured in real time. Therefore, when an abnormality can be confirmed in the protection circuit, there is a problem that the battery can no longer be used.

  The present invention has been made paying attention to the above problems, and with a simple configuration and processing, the presence / absence / progress of deterioration of each battery is determined at an early stage, that is, after the abnormality has occurred. It is an object of the present invention to provide a secondary battery deterioration determination method and a secondary battery deterioration determination device that can be determined in advance and can ensure highly accurate battery maintenance and safety.

  In order to solve the above-described problems, a secondary battery deterioration determination method according to the present invention includes a plurality of secondary batteries connected in series, a battery voltage detection unit that detects the voltage of each secondary battery, and each battery voltage. A balance circuit that is turned on when the voltage of each secondary battery detected by the detection unit is within the reference and energizes the current to the secondary battery to adjust the battery voltage, and according to each secondary battery voltage And a secondary battery deterioration determining device including a control device that controls the balance circuit, and determining a deterioration of each secondary battery, wherein the secondary battery voltage is within the reference A first step of turning on a balance circuit corresponding to a certain case, a second step of storing ON of each balance circuit as operation information, and comparison of operation information of each balance circuit, The third to determine whether the secondary battery has deteriorated Characterized in that it comprises a step, a.

  In the present invention, the operation information is specifically the operation rate of the balance circuit, and the battery deterioration can be determined by comparing the operation rates of the balance circuits.

  Specifically, by comparing the operation rates of the balance circuits, a battery corresponding to a balance circuit having an operation rate smaller than that of other balance circuits can be determined as a deteriorated battery.

  Specifically, by comparing the operation rates of the balance circuits, a battery corresponding to a balance circuit having an operation rate larger than that of other balance circuits can be determined as a deteriorated battery.

  Further, the secondary battery deterioration determination method of the present invention uses a secondary battery deterioration determination device provided with a data communication device connected to the control device via a network, to determine the deterioration of each secondary battery. A battery deterioration determination method, characterized in that, when a required call is made from the data communication device, the deterioration determination information of each secondary battery is transmitted to the data communication device and output. There may be.

  Furthermore, the secondary battery deterioration determination method of the present invention uses a secondary battery deterioration determination device provided with a data communication device connected to the control device via a network to determine deterioration of each secondary battery. A secondary battery deterioration determination method, wherein the control device transmits deterioration determination information for each secondary battery to the data communication device, and outputs the deterioration determination information for each secondary battery from the data communication device. It may be characterized by the above.

  Moreover, the secondary battery deterioration determination device of the present invention is connected in parallel to a plurality of secondary batteries connected in series, a battery voltage detector for detecting the voltage of each secondary battery, and the secondary batteries. And a circuit control means for operating on a balance circuit that diverts and energizes a current flowing through the secondary battery when the voltage of each secondary battery detected by each battery voltage detection unit is within a reference. Deterioration for determining a deteriorated battery by comparing operation information of each balance circuit corresponding to each secondary battery stored in the operation information storage means, operation information storage means for storing operation information of each balance circuit at a predetermined timing And a control device having determination means.

  Further, specifically, the secondary battery deterioration determination device according to the present invention is a secondary battery deterioration determination device that enables a data communication device to be connected to the control device via a network, from the data communication device. At the time of calling, the deterioration determination information of each secondary battery may be transmitted to the data communication device and output.

  Further, specifically, the secondary battery deterioration determination device of the present invention is a secondary battery deterioration determination device that enables a data communication device to be connected to the control device via a network. The secondary battery deterioration determination information may be transmitted to the data communication device, and the secondary battery deterioration determination information may be output from the data communication device.

According to the present invention, the operation information of each balance circuit is stored for each predetermined timing, and the deterioration of the secondary battery is determined from the stored operation information of each balance circuit. Can be determined in advance, not after the occurrence of an abnormality, and high-precision maintenance and safety can be ensured.

  Further, in the present invention, in the method for determining the deterioration of each secondary battery using the secondary battery deterioration determining device including the data communication device connected to the control device via the network, the secondary battery is installed. The deterioration determination data can be confirmed from a location far away from the location where the secondary battery is installed, and even when the secondary battery is installed in a location that is difficult for the operator to confirm, the degradation determination can be performed directly from a location far away.

It is a circuit diagram explaining the schematic structure of the secondary battery deterioration determination apparatus which concerns on one Embodiment of this invention. It is a flowchart for demonstrating the battery deterioration determination operation | movement in the secondary battery deterioration determination apparatus of the embodiment. FIG. 6 is a timing waveform diagram showing an example of battery voltage change when each balance circuit is turned on and off in order to explain a battery deterioration judgment operation of the secondary battery deterioration judgment device of the same embodiment. It is a timing waveform diagram showing an example of ON / OFF operation of each balance circuit in order to explain the battery deterioration determination operation of the secondary battery deterioration determination device of the same embodiment. It is a figure which shows the data map of the operation rate memorize | stored in the memory | storage part of the signal processing apparatus of the embodiment secondary battery deterioration determination apparatus. It is a figure which shows the example of a measurement of the voltage transition and the operation rate change of a balance circuit when one of the batteries of series connection increases impedance. It is a figure which shows the measurement example of the voltage change in case one of the batteries of series connection has raise | generated the capacity | capacitance fall, and the operation rate change of a balance circuit. It is a figure which shows the measurement example of the voltage change in case one of the batteries of series connection has raise | generated the current leak, and the operation rate change of a balance circuit. It is a block explaining the schematic structure of the secondary battery degradation determination system concerning other embodiments of this invention. It is a circuit diagram explaining schematic structure of the secondary battery terminal device of the embodiment secondary battery deterioration determination system. It is a flowchart for demonstrating the battery deterioration determination process in the secondary battery deterioration determination system of the embodiment. Furthermore, it is a flowchart for demonstrating the battery deterioration determination process in other embodiment secondary battery deterioration determination system.

Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a block diagram showing a circuit configuration of a secondary battery deterioration determination device according to an embodiment of the present invention.

In FIG. 1, n secondary batteries (lithium ion batteries) BT1, BT2,..., BTn are connected in series. Each battery BT1, BT2,..., BTn is charged from the charging source 1 via the switch SW1. Further, the charging voltage of each battery BT1, BT2,..., BTn is discharged to the load 8 via the switch SW2.
Battery voltage detectors 21, 22,..., 2n for individually detecting battery voltages are connected in parallel to the batteries BT1, BT2,. In addition, each of the batteries BT1, BT2,..., BTn has a balance circuit 31, 32,. 3n are connected.

  The signal processing device 4 is provided to perform control during charging and discharging of the batteries BT1, BT2,..., BTn, and includes a control calculation unit 5, a storage unit 6, and a display unit 7. The control calculation unit 5 is predetermined by the battery voltage detection units 21, 22,..., 2n at the time of charging the battery when the switch SW1 is ON or discharging from the switch SW2 to the load 8 when the switch SW2 is ON. .., BTn voltage V1, V2,..., Vn are taken in a cycle, and the minimum value is extracted from the taken-in voltages V1, V2,. A function of calculating a reference voltage Vk for adding a predetermined value to the minimum value and determining whether or not the balance circuits 31, 32,.

Instead of the reference voltage Vk of this embodiment, an average voltage of the taken-in voltages V1,..., Vn may be calculated, and a predetermined value may be added to the average voltage to obtain the reference voltage Vk.
In addition, the control calculation unit 5 compares the battery voltages V1, V2,..., Vn detected by the battery voltage detection units 21, 22,. In this case, a function of turning on (energizing) the balance circuit 3i corresponding to the battery BTi is provided.

  Moreover, the control calculating part 5 is provided with the function which memorize | stores the electricity supply condition of each balance circuit 31, 32, ..., 3n in the memory | storage part 6 with progress of time. The control calculation unit 5 refers to the energization status (operation information) stored in the storage unit 6 of each of the balance circuits 31, 32,. 32,..., 3n is provided with a function of determining whether or not each battery BT1, BT2,. Specifically, the operation information here indicates, for example, an operation rate indicating in% how many times it is turned ON during 10 timings. For example, when ON is performed 6 times during 10 times, 6/10 × 100 = 60%.

  The storage unit 6 of the signal processing device 4 includes battery voltage detection units 21, 22,..., 2 n detected by the battery voltages V 1, V 2,. , Vn, and the energization status of each balance circuit 31, 32,..., 3n (the number of ON times and the operation rate of each balance circuit) are stored. Of course, this operation rate is not limited to this, but for each timing, for example, using the statistical method according to another formula, for example, Xn × (n−1) + X (n−1) / n, for the past n times at that timing. The operating rate may be obtained from the ON count data.

  Moreover, the display part 7 will display the operation rate, if the operation rate of each balance circuit is calculated by the control calculating part 5. FIG. The display unit 7 may display the number of times of ON corresponding to 10 timings in time sequence, or may display the operation rate of each voltage and each balance circuit in a graph. A deteriorated battery can be determined based on the operating rate of each balance circuit displayed on the display unit 7.

  As described above, the secondary battery deterioration determination device according to the present embodiment can determine the deterioration of each secondary battery. Next, an outline of secondary battery deterioration determination performed by the secondary battery deterioration determination device of this embodiment will be described.

  First, at the time of charging the batteries BT1, BT2,..., BTn, the terminal voltages of the batteries BT1, BT2,. V1, V2,..., Vn are detected, taken into the control calculation unit 5 and stored in the storage unit 6. The control calculation unit 5 compares the captured battery voltages V1, V2,..., Vn with a predetermined reference voltage Vk, and turns on the balance circuit 3i that increases the battery voltage Vi in accordance with a command from the control calculation unit 5. The current to the corresponding battery BTi is bypassed to the balance circuit 3i and the adjustment current is supplied.

  Further, simultaneously with the ON / OFF of the balance circuit 3i, the presence or absence of the operation (ON operation) of the balance circuit 3i is stored in the storage unit 6. Then, the operation rate characteristics of the respective balance circuits 31, 32,..., 3n (1 ≦ i ≦ n) are compared with each other, and a balance circuit having an operation rate characteristic different from that of other battery balance circuits is provided. By extracting the battery, the deterioration of the battery is estimated at an early stage.

  When the balance circuits 31, 32,..., 3n are turned ON, the battery BTi having a large terminal voltage reduces the terminal voltage Vi by bypassing the charging current of the battery BTi to the balance circuit 3i. Since the voltage between the batteries is balanced and the difference between the large battery voltage and the small battery voltage is small, it is not possible to judge the deterioration of each battery only by comparing the battery voltages V1, V2,. I can't.

  In this embodiment device, the number of ON times (operating rate) of the balance circuits 31, 32,..., 3n is further memorized. It is possible to determine the deterioration of the battery without requiring the addition of a special circuit / device.

  Next, the processing operation at the time of charging of the secondary battery deterioration determination device of this embodiment will be described in detail with reference to the flowchart shown in FIG. 2 and the waveform time charts shown in FIGS. When the switch SW1 is turned on by a command from the signal processing device 4 or manually, a charging processing operation for each battery is started. First, in step ST1, a variable T indicating processing timing is set to T = 1. Next, the process proceeds to step ST2.

  In step ST2, battery voltages V1, V2,..., Vn of the batteries BT1, BT2,..., BTn are detected by the battery voltage detectors 21, 22,. To do. Next, the process proceeds to step ST3. In step ST3, a minimum value (for example, V4) is obtained from battery voltages V1, V2,..., V4 (n = 4). Subsequently, the process proceeds to step ST4, where Vk = V4 + a obtained by adding a fixed value a to the obtained minimum value V4 is set as a reference voltage.

  Next, the process proceeds to step ST5. In step ST5, variable i = 1. The variable i is a variable indicating any one of the batteries BT1, BT2,. Next, the process proceeds to step ST6. In step ST6, it is determined whether or not the battery voltage Vi, that is, V1 is greater than the reference voltage Vk. If the determination result is V1> Vk, the determination is YES and the process proceeds to step ST7. On the other hand, if V1> Vk is not satisfied, the process proceeds to step ST9.

  Here, as an example, it is assumed that n = 4 and n of the batteries BT1, BT2,..., BTn is 4, and the voltages of the batteries BT1, BT2,. Assume that V2> V3> V4 (see waveform example in FIG. 3). Under this assumption, whether or not voltage V1> Vk is determined as YES, and when the determination in step ST6 is YES, the process proceeds to the next step ST7.

  In step ST7, the balance circuit 31 is turned on. That is, the balance circuit 31 is turned on. As a result, the charging current to the battery BT1 with the high voltage V1 is supplied to the balance circuit 31 as the adjustment current. Energization of the balance circuit 31 at this time is indicated by I11 in FIG. Further, by this energization, the battery voltage V1 drops by a predetermined value from V11 as shown in FIG. Next, the process proceeds to step ST8.

  In step ST8, the number of times the balance circuit 31 is turned on (number of operations) 1 (I11 in FIG. 4) is counted. Next, the process proceeds to step ST9. In step ST9, it is determined whether i = n (n = 4). Since i = 1 here, the process proceeds to step ST10 with a determination NO. In step ST10, the variable i is incremented, i = 2 is set, and the process returns to step ST6. In step ST6, it is determined whether or not battery voltage V2> Vk. In the assumed waveform example of FIG. 3, the determination is YES, and the process proceeds to step ST7.

  In step ST7, the balance circuit 32 is turned on. When the balance circuit 32 is turned on, a charging current for the battery BT2 is supplied to the balance circuit 32 as an adjustment current. The energization of the balance circuit 32 at this time is indicated by I21 in FIG. Further, by this energization, the battery voltage V2 drops by a predetermined value from V21 as shown in FIG. Next, the process proceeds to step ST8.

  In step ST8, the number of ON times 1 of the balance circuit 32 (I21 in FIG. 4) is counted. Next, the process proceeds to step ST9. In step ST9, since i = 2 here, the determination of i = n (n = 4) is NO, and the process proceeds to step ST10. In step ST10, the variable i is incremented to i = 3, and the process returns to step ST6.

  Thereafter, the processing of steps ST6 to ST9 is executed with respect to the battery BT3 to determine whether or not the battery voltage V3> Vk. In the waveform example of FIG. 3, V31> Vk. Then, the number of ON times 1 of the balance circuit 33 (I31 in FIG. 4) is counted. Furthermore, since i = 3 in step ST9, the process proceeds to step ST10 with a determination NO as to whether i = n (n = 4) or not. Here, the variable i is incremented to i = 4, and the process returns to step ST6.

  Further, the processes of steps ST6 to ST9 are executed for the battery BT4. In step ST6, it is determined whether or not battery voltage V4> Vk. Under the assumption of FIG. 3, V4 is smaller than the reference voltage Vk, and this determination is NO. Therefore, the process of steps ST7 and ST8 is skipped and the process proceeds to step ST9. Accordingly, here, the balance circuit 34 is not turned ON, and the number of ON times of the balance circuit 34 is not stored. In step ST9, it is determined whether i = 4 (n = 4). If the determination is YES, the process proceeds to step ST11.

  With the above processing, the battery voltage is detected at the timing T1 for the batteries BT1,..., BT4, and the balance circuit is turned on for each battery voltage V1,. The ON number 1 of the balance circuit that has been turned ON is stored in the storage unit 6. In the example of FIGS. 3 and 4, the balance circuits 31, 32, and 33 are turned on for the batteries BT 1, BT 2, and BT 3, and the ON count 1 is stored in the storage unit 6.

  Thereafter, in step ST11, it is determined whether or not the variable T is T = Tk (Tk = 10). If this determination is NO, the process proceeds to step ST12, the variable T is incremented, and T = 2. Next, the process returns to step ST2.

  Subsequently, the processes of steps ST2 to ST11 are executed in the same manner as at the timing T1. In the hypothetical example of FIG. 3, the voltage V12 of the battery BT1, the voltage V22 of the battery BT2, and the voltage V32 of the battery BT3 are decreased by the balance adjustment at the previous timing, but all are still higher than the reference voltage Vk. The balance circuits 31, 32, and 33 are turned ON, and the number of ON times 1 of the balance circuits 31, 32, and 33 (I12, I22, and I32 in FIG. 4) is added and counted.

  Next, when the process at the timing T2 ends, the variable T is incremented in step ST12, T = 3, the process returns to step ST2, and the same process as that at the timing T2 is executed. Similarly, the same processing is repeated until the variable T = 10 (Tk = 10).

  By the above processing from timing T = 1 to timing T = 10, in the hypothetical example of FIGS. 3 and 4, the battery BT1 has the voltages V11,..., V110 at each timing higher than the reference voltage Vk. The balance circuit 31 is turned ON 10 times with I11,..., I110. In the battery BT2, from the first timing to the sixth timing, the voltages V21,..., V26 are higher than the reference voltage Vk, and the balance circuit 32 is turned ON six times as I21,. In the battery BT3, from the first timing to the third timing, the voltages V31, V32, and V33 are higher than the reference voltage Vk, and the balance circuit 33 is turned ON three times, I31, I32, and I33. When T = 10, it is determined whether T = Tk (Tk = 10) in step ST11, and the process proceeds to step ST13. In step ST13, the operating rate of each battery BT1, ..., BT4 is calculated and stored in the storage unit 6.

  In the above embodiment, the operation rate of the balance circuit 31 is 100% when the number of ONs in FIG. 4 is 10, and the operation rate of the balance circuit 32 is 60% when the number of ONs in FIG. The number of ON times in FIG. 4 is 30%, and the operating rate of the balance circuit 34 is 0% in FIG. 4 when the number of ON times is 0. This operating rate (%) is stored in the storage area t1 shown in FIG. Remembered.

  Subsequent to the operation rate calculation in step ST13, the process proceeds to step ST14 to determine whether or not the deterioration evaluation mode is set. If the determination is NO, the process returns to step ST1 and starts the process in t2 that is the operation rate calculation period. To do. On the other hand, when the determination in step ST14 is YES, the process proceeds to step ST15, and the operating rate of each battery is displayed on the display unit 7 as the degree of deterioration. In addition, the deterioration degree here displays the operation rate of each balance circuit in time passage t1, ..., and determines a deterioration battery from the change state of an operation rate.

  For example, when the internal resistance (impedance) of a battery increases due to partial separation between a metal electrode for taking out electricity, a positive electrode material that accumulates electric charge, and a negative electrode material as a deteriorated battery, other batteries remain charged due to an increase in internal resistance. The voltage becomes higher, the operation rate becomes higher than other batteries, and deterioration can be determined from the displayed operation rate.

  A specific example in this case is shown in FIG. In this example, measurement examples of 12 batteries (cells) are shown from time 0 (h) to 1.2 (h), the upper figure shows an example of change in voltage (mv), and the lower figure shows a balance. The circuit operation rate (%) is shown. In this example, the internal resistance (impedance) of the battery of cell number 11 is increased, and the voltage is higher than that of other batteries at the beginning of the process. Therefore, the operating rate of only the corresponding balance circuit of the battery of cell number 11 is as shown in FIG. It is higher as shown by the bold line in the figure below. Only the balance circuit of this battery has a higher operating rate than the balance circuit of other batteries, and it is possible to determine the deterioration of this battery.

  In addition, for example, when the capacity of a deteriorated battery is decreased due to deterioration of the positive electrode material and the negative electrode material, the generation is caused by an increase in impedance due to the decrease in capacity in the charged state as in the case where the internal resistance of the battery is increased. Since the battery has a higher voltage than other batteries, the operation rate of the balance circuit of the other battery is lower than that of this battery, and the deterioration of a certain battery is caused by the required or displayed operation rate. Can be determined.

  FIG. 7 shows a specific example of this case in which the capacity is reduced. In this example, measurement examples of 12 batteries (cells) are shown from time 0 (h) to 0.8 (h). Also in this example, the battery of cell number 11 is shown in the upper diagram of FIG. The voltage is initially high. Only the balance circuit of this battery has a high operating rate as shown in the lower diagram of FIG. Only the balance circuit of this battery has a higher operating rate than the balance circuit of other batteries, and it is possible to determine the deterioration of this battery.

  In addition, as a deteriorated battery, if a small leak occurs inside due to the occurrence of dent light, etc., the generated battery has a voltage lower than that of other batteries, so that the operating rate of other batteries is high. The battery has a low operating rate, and deterioration can be determined by the displayed operating rate.

  A measurement example in this case is shown in FIG. In this example, measurement examples of 12 batteries (cells) are shown from time 0 (h) to 70 (h). Referring to the upper diagram of FIG. 8, the battery voltage of the cell number 10 gradually decreases with time as compared to other batteries, and the lower diagram of FIG. The deterioration of the battery can be determined from the transition of the operating rate of the balance circuit, which is lower than that of the balance circuit. In the measurement examples of FIGS. 6, 7, and 8, the operating rate is obtained by the statistical method.

  In the above-described embodiment, the secondary battery deterioration determination device 10 includes the secondary batteries BT1, BT2,..., BTn and the battery voltage detection units 21, 22,. The balance circuits 31, 32,..., 3n and the signal control device 4 are integrally configured, and the result of the deterioration determination can be confirmed at the location where the battery is installed.

  The present invention is not limited to this, and the determination data and determination result of the secondary battery deterioration determination device may be confirmed at a location far from the location where the battery is installed. A secondary battery deterioration determination system (apparatus) shown in FIG. 9 will be described as this type of embodiment.

  In FIG. 9, a data communication device 30 can be connected to a plurality of secondary battery terminal devices (secondary battery deterioration determination devices) 10-1, 10-2,. It is configured. Here, a plurality of secondary battery terminal devices 10 are installed, but it goes without saying that a single unit may be used. The secondary battery terminal devices 10-1, 10-2,..., 10-q have the same circuit configuration and operation as the secondary battery deterioration determination device shown in FIG. It is configured to be connectable to the network 20 via the input / output unit 9.

  In this embodiment, the secondary battery terminal devices 10-1, 10-2,..., 10 -q are each balanced circuit as in the secondary battery degradation determination device of FIG. Are stored, and the deterioration judgment result of each battery is stored. The data communication device 30 accesses the target device of any one of the secondary battery terminal devices 10-1, 10-2,..., 10-q via the network 20 at a desired timing. The operation rate of the balance circuit and the deterioration status of the battery can be displayed and output.

  With reference to the flowchart shown in FIG. 11, the outline | summary of the processing operation of this embodiment secondary battery deterioration determination system is demonstrated. First, in the data communication device 30, a call for a target secondary battery terminal device is input to the secondary battery terminal device 10 in order to call data indicating a secondary battery deterioration state. In step ST31, the data communication device 30 determines whether or not the own device has a call operation. If there is a call operation from the input unit of the device itself, the determination is YES and the process proceeds to step ST32. In step ST32, an access signal for requesting deterioration determination data is sent to the target secondary battery terminal apparatus 10.

  The secondary battery terminal apparatus 10 determines whether or not the deterioration determination process is necessary in step ST21. If the deterioration determination process is necessary, the process proceeds to step ST22, and the deterioration determination process is executed in step ST22. Specifically, this deterioration determination processing is, for example, the processing of the flowchart of FIG. 2, and the storage unit 6 stores the operation rate of each balance circuit, data on the presence / absence of deterioration, and the like. Next, the process proceeds to step ST23. On the other hand, in step ST21, when the deterioration determination process is not necessary in the operation mode of the secondary battery terminal apparatus 10, the process of step ST22 is skipped and the process proceeds to step ST23.

  In step ST23, it is determined whether there is a call access from the data communication device 30 or not. If it is determined YES whether there is a call, the process proceeds to step ST24. If NO is determined whether there is a call, step ST24 is skipped and the process returns. In step ST24, deterioration determination data such as the operation rate of each balance circuit and deterioration presence / absence data stored in the storage unit 6 of the secondary battery terminal device 10 are transmitted to the data communication device 30 that has accessed the call.

  On the other hand, the data communication device 30 determines whether or not deterioration determination data is received in step ST33. When the deterioration determination data is received from the secondary battery terminal device 10 described above, the process proceeds to step ST34 with this determination YES. On the other hand, if the deterioration determination data has not been received, step ST34 is skipped and the process returns. In step ST34, the data communication device 30 displays the deterioration determination data received from the secondary battery terminal device 10 on the display.

  According to the secondary battery deterioration determination method of this embodiment, from the data communication device remote from the secondary battery terminal device, read the deterioration determination data measured by the secondary battery terminal device via the network at an arbitrary time point, Because it can be displayed, the deterioration judgment data can be confirmed from a location far away from the location where the secondary battery terminal is installed, even if the secondary battery is installed in a location that is difficult for the operator to confirm. It is possible to make the deterioration judgment directly from the place where it was.

  Further, another embodiment will be described in which battery deterioration determination is possible at a location different from the battery installation location. Also in the secondary battery deterioration determination method according to this embodiment, the deterioration determination is performed by the secondary battery deterioration determination system shown in FIG. Further, the secondary battery terminal apparatuses 10-1, 10-2,..., 10-q use the secondary battery deterioration determination apparatus 10 shown in FIG. 10 as in the embodiment using the network. .

  The feature in this embodiment is that the secondary battery terminal device 10 itself can measure the operation rate and deterioration determination data of the balance circuit of each secondary battery, and the operation rate and deterioration determination data are networked at predetermined intervals. 20, and the data communication device 30 can also display and output the operation rate and the deterioration determination data.

  With reference to the flowchart shown in FIG. 12, the processing operation of this secondary battery deterioration determination system will be described. The secondary battery terminal device 10 continues the measurement / storage of the operation rate of each balance circuit, the deterioration determination process, and the storage thereof as in the case of the above embodiment. On the other hand, each battery voltage, the operating rate of each balance circuit, and other deterioration determination processing data are transmitted to the data communication device 30 via the network 20 at predetermined timings.

  When the secondary battery terminal apparatus 10 enters the deterioration determination process routine shown in FIG. 12, it is determined in step ST41 whether or not the deterioration determination process is necessary. If the determination is YES, the process proceeds to step ST42. In step ST42, the operation rate measurement of the balance circuit and the battery deterioration determination process are performed in the secondary battery terminal device 10, and the process proceeds to step ST43.

  On the other hand, in the case of determination NO in step ST41, the process of step ST42 is skipped and the process proceeds to step ST43. In step ST43, it is determined whether it is a transmission timing. If the transmission timing has arrived, the determination is YES and the process proceeds to step ST44. In step ST44, deterioration determination data such as the battery voltage and the operation rate of the balance circuit stored in the storage unit 6 are transmitted to the data communication device 30 via the network 20. If the transmission timing is not reached in step ST43, the process returns with a determination NO.

  When the data communication device 30 enters the deterioration determination processing routine shown in FIG. 12, it is determined in step ST51 whether or not deterioration determination data is received. When data is received from the secondary battery terminal device 10 and the determination is YES, the process proceeds to step ST52. In step ST52, the received deterioration determination data is stored. Next, the process proceeds to step ST53.

  On the other hand, in step ST51, if the deterioration determination data is not received from the secondary battery terminal device 10 and the determination is NO, the process of step ST52 is skipped and the process proceeds to step ST53. In step ST53, it is determined whether or not deterioration determination data is displayed. If it is desired to check whether or not the secondary battery has deteriorated in the data communication device 30, and if it is input to that effect, the determination is YES in step ST53, and the process proceeds to step ST54. In step ST54, the deterioration determination data is displayed on the display unit of the data communication device 30.

  On the other hand, in step ST53, if there is no input of deterioration determination data display and the determination is NO, the process returns.

  According to the secondary battery deterioration determination method of this embodiment, the secondary battery terminal device capable of determining the deterioration of the secondary battery is also operated at a predetermined timing to the data communication device separated from the secondary battery terminal device. The rate and deterioration determination data is transmitted via the network, and the battery deterioration determination can be performed by the data communication device as necessary, and the deterioration determination can be performed earlier from either the secondary battery terminal device or the data communication device. I can do it.

BT1, BT2, ..., BTn batteries V1, V2, ..., Vn battery voltage
SW1 Charging switch SW2 Discharging switch 1 Charging sources 21, 22, ..., 2n Battery voltage detectors 31, 32, ..., 3n Balance circuit 4 Signal control device
DESCRIPTION OF SYMBOLS 5 Control calculating part 6 Memory | storage part 7 Display part 8 Load 9 Input / output part 10, 10-1, ..., 10-q Secondary battery deterioration determination apparatus (secondary battery terminal device)
20 Network 30 Data processing device

Claims (9)

When a plurality of secondary batteries connected in series, a battery voltage detection unit for detecting the voltage of each secondary battery, and the voltage of each secondary battery detected by each battery voltage detection unit are within the reference Using a secondary battery deterioration determination device that includes a balance circuit that is turned on and supplies a current to the secondary battery to adjust the battery voltage, and a control device that controls the balance circuit according to each secondary battery voltage. A secondary battery deterioration determination method for determining deterioration of each secondary battery,
A first step of turning on a balance circuit corresponding to the case where the secondary battery voltage is within the reference;
A second step of storing ON of each balance circuit as operation information;
A third step of determining the presence or absence of deterioration of each secondary battery by comparing the operation information of each balance circuit;
A secondary battery deterioration determination method comprising: The secondary battery deterioration determination method according to claim 1, wherein the operation information is an operation rate of the balance circuit, and battery deterioration is determined by comparing the operation rates of the balance circuits. The battery corresponding to the balance circuit having an operation rate smaller than that of other balance circuits is determined as a deteriorated battery by comparing the operation rates of the balance circuits. Secondary battery deterioration judgment method. 3. The battery according to claim 2, wherein a battery corresponding to a balance circuit having an operation rate larger than that of another balance circuit is determined as a deteriorated battery by comparing the operation rates of the balance circuit. Secondary battery deterioration judgment method. A secondary battery deterioration determination method for determining deterioration of each secondary battery using a secondary battery deterioration determination apparatus provided with a data communication device connected to the control device via a network, from the data communication device 5. The information on whether or not each secondary battery has deteriorated is transmitted to and output from the data communication device at the time of a required call of claim 1, claim 2, claim 3, and claim 4. The secondary battery deterioration determination method described. A secondary battery deterioration determination method for determining deterioration of each secondary battery using a secondary battery deterioration determination apparatus provided with a data communication device connected to the control device via a network, from the control device, The deterioration determination information of each secondary battery is transmitted to the data communication device to the data communication device, and the deterioration determination information of each secondary battery is output from the data communication device. The secondary battery deterioration determination method according to claim 1, claim 2, claim 3 and claim 4. A plurality of secondary batteries connected in series, a battery voltage detector for detecting the voltage of each secondary battery, each balance circuit connected in parallel to each secondary battery, and each battery voltage detector When the detected voltage of each secondary battery is within the reference, circuit control means for turning on the balance circuit that shunts the current flowing through the secondary battery, and the operation information of each balance circuit at a predetermined timing An operation information storage means for storing, and a control device having a deterioration determination means for determining a deteriorated battery by comparing operation information of each balance circuit corresponding to each secondary battery stored in the operation information storage means. A secondary battery deterioration determination device. A secondary battery deterioration determination device capable of connecting a data communication device to the control device via a network,
8. The secondary battery deterioration determination device according to claim 7, wherein when the data communication device calls, the secondary battery deterioration determination information is transmitted to and output from the data communication device. A secondary battery deterioration determination device capable of connecting a data communication device to the control device via a network,
The control device transmits deterioration determination information of each secondary battery to the data communication device, and outputs the deterioration determination information of each secondary battery from the data communication device. Item 8. The secondary battery deterioration determination device according to Item 7.