JP2016211994A - Charging/discharging device and charging/discharging voltage switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging/discharging device capable of solving a conventional problem that a charging/discharging device has to be reset according to the type of the secondary battery.SOLUTION: The charging/discharging device for testing charging/discharging on a secondary battery, includes: plural charging/discharging circuits each having identical functions; plural switches for connecting plural charging/discharging circuits in series or in parallel; a detection section that detects the voltage across the terminals of the secondary battery; and a control unit that determines charging/discharging voltage to be output to the secondary battery based on the voltage across the terminals and controls the combination of plural charging/discharging circuits by opening/closing the plural switches to obtain the charging/discharging voltage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charge / discharge device and a charge / discharge voltage switching method.

  In recent years, secondary batteries have been used in various fields ranging from large devices such as electric vehicles and solar cell systems at night and emergency storage batteries in disasters to small devices such as mobile phones. The manufacturer of the secondary battery maintains the quality of the secondary battery by performing a charge test and a discharge test using a charge / discharge test apparatus. However, secondary batteries have different charge / discharge voltages depending on the type, and it is difficult to handle various types of secondary batteries with a single charge / discharge test apparatus. Thus, as an example of a charger, an apparatus that connects a plurality of chargers in series or in parallel according to the type of secondary battery has been studied (for example, see Patent Document 1).

JP 05-276673 A

  However, a specific method for determining the type of the secondary battery to be connected has not been studied, and there are problems such as reading the identification number of the secondary battery and requiring the operator to set it manually. It was.

  The charging / discharging device and the charging / discharging voltage switching method according to the present disclosure provide a technique for making it easier to set a combination of charging / discharging circuits corresponding to a secondary battery that is a target of a charging / discharging test.

  According to one aspect, in a charge / discharge device for performing a charge / discharge test of a secondary battery, a plurality of charge / discharge circuits, a plurality of switches connecting the plurality of charge / discharge circuits in series or in parallel, and a terminal of the secondary battery A combination of multiple charge / discharge circuits by opening and closing multiple switches to determine the charge / discharge voltage to be output to the secondary battery based on the inter-terminal voltage And a control unit for controlling.

  According to one aspect, a charge / discharge voltage switching method in a charge / discharge device for performing a charge / discharge test of a secondary battery, wherein the charge / discharge voltage output to the secondary battery is detected by detecting a voltage between terminals of the secondary battery. And determining a charge / discharge voltage by opening and closing a plurality of switches connecting the plurality of charge / discharge circuits in series or in parallel.

  The charging / discharging device and the charging / discharging voltage switching method of the present disclosure can set the combination of charging / discharging circuits according to the secondary battery to be charged / discharged test more easily than before.

It is a figure which shows an example of a charging / discharging apparatus. It is a figure which shows an example of a secondary battery. It is a figure which shows an example of a switch part. It is a figure which shows the process example of a charging / discharging test. It is a figure which shows an example of the opening / closing pattern according to charging / discharging voltage. It is a figure which shows the example of opening and closing of the switch of the pattern 1 and the pattern 2. FIG. It is a figure which shows an example of the switch part of the pattern 1. FIG. 6 is a diagram illustrating an example of a switch unit of pattern 2. FIG. It is a figure which shows the example of opening and closing of the switch of the pattern 3 and the pattern 4. FIG. 6 is a diagram illustrating an example of a switch unit of pattern 3. FIG. 10 is a diagram illustrating an example of a switch unit of pattern 4. FIG. It is a figure which shows the example of opening and closing of the switch of the pattern 5 and the pattern 6. FIG. 6 is a diagram illustrating an example of a switch unit of pattern 5. FIG. 6 is a diagram illustrating an example of a switch unit of pattern 6. FIG.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 shows an example of a charge / discharge device 101 according to the present embodiment. The charge / discharge device 101 is a device that performs a charge / discharge test of the secondary battery 150. In addition, although this embodiment demonstrates the example of the charging / discharging apparatus 101 which performs the charging / discharging test of the secondary battery 150, it is the same as the charging / discharging apparatus 101 shown in FIG. 1 in the charging device for charging the secondary battery 150. The following configuration may be applied.

  In FIG. 1, the charging / discharging device 101 includes ten converters: a converter (indicated as CONV in the figure) 102 (1), a converter 102 (2), a converter 102 (3),. Have Here, when the matters common to the converter 102 (1) to the converter 102 (10) are described, the reference numeral (number) at the end of the code is omitted and the converter 102 is described. In the present embodiment, the charging / discharging device 101 has ten converters 102, but the present invention can be similarly applied if it has a plurality of converters 102 such as four or twenty. In the present embodiment, the converters 102 are connected in series or in parallel, and therefore, it is preferable to use the converters 102 of the same type having the same performance.

  In FIG. 1, the charge / discharge device 101 includes ten converters 102, a switch unit 103, a control unit 104, a voltage detection unit 105, and a storage unit 106. In addition, the charging / discharging device 101 includes a measuring unit 151 for measuring the charging / discharging characteristics of the secondary battery 150. The measurement unit 151 includes a shunt resistor for measuring the charge / discharge current flowing through the secondary battery 150, a voltmeter for measuring the voltage Vb between the terminals of the secondary battery 150, and the like.

  In FIG. 1, a converter 102 has a charge / discharge circuit, and a control unit 104 controls a charge / discharge voltage, a charge / discharge current, and the like of the converter 102.

  The switch unit 103 includes a plurality of switches that can freely connect the outputs of the ten converters 102 and the terminals of the secondary battery 150. The switch unit 103 includes a first switch 201 that connects a plurality of converters 102 in series by connecting the positive and negative electrodes of the converters 102 adjacent to each other. The switch unit 103 includes a second switch 202 that connects the plurality of converters 102 in parallel by connecting the positive and negative electrodes of the plurality of converters 102 to each other.

  The control unit 104 determines a charge / discharge voltage according to the inter-terminal voltage Vb of the secondary battery 150 connected to the charge / discharge device 101, and the switch unit 103 so that the determined charge / discharge voltage is applied to the secondary battery 150. To control. Control unit 104 controls the charge / discharge voltage and charge / discharge current of converter 102 in accordance with the charge / discharge test mode of secondary battery 150. Here, the charge / discharge test mode includes, for example, a constant voltage test, a constant current test, a constant power test, and the like, and the charge / discharge test of the secondary battery 150 may be performed by combining a plurality of tests. Further, the control unit 104 measures the charge / discharge voltage and the charge / discharge current during the charge / discharge test by the measuring unit 151, and outputs the measurement result to the control terminal 107.

  The voltage detection unit 105 detects the inter-terminal voltage Vb of the secondary battery 150 and outputs the inter-terminal voltage Vb to the control unit 104. The voltage detection unit 105 may be shared with a circuit that measures the voltage of the measurement unit 151.

  The storage unit 106 includes a table 131 that stores information indicating correspondence between the open / close pattern corresponding to the charge / discharge voltage output to the secondary battery 150 and the open / close state of each switch of the switch unit 103. The table 131 includes, for example, a table 131 a that stores information indicating correspondence with an open / close pattern corresponding to a charge / discharge voltage output to the secondary battery 150, and an open / close pattern and an open / close state of each switch of the switch unit 103. And a table 131b in which information indicating correspondence is stored. Here, in the present embodiment, the table 131 is described as being divided into the table 131a and the table 131b, but the table 131a and the table 131b may be a single table. Then, the control unit 104 refers to the table 131 in the storage unit 106, acquires the open / close pattern of each switch of the switch unit 103 corresponding to the charge / discharge voltage output to the secondary battery, and controls the switch unit 103.

  The control terminal 107 is connected to the charging / discharging device 101 and operated by an operator. For example, the operator sets a test mode to the charge / discharge device 101 from the control terminal 107 or instructs the start of the test. In addition, the control terminal 107 displays the measurement result of the secondary battery 150 measured by the measurement unit 151 of the charging / discharging device 101 on a monitor or saves it in a storage medium such as a built-in hard disk.

  In this way, the charging / discharging device 101 according to the present embodiment determines the charging / discharging voltage by detecting the inter-terminal voltage Vb of the secondary battery 150 even when the type and characteristics of the secondary battery 150 are unknown. The charged / discharged voltage can be applied to the secondary battery 150.

  FIG. 2 shows an example of a secondary battery 150 connected to the charge / discharge device 101 and a charge / discharge device corresponding to the secondary battery 150. Here, the secondary battery 150 is a storage battery using Ni (nickel), Li (lithium), or the like as a material, and there are various types of materials having different types and structures. For example, in the case of the lithium ion type, a cell having an electromotive force of about 3.7 V is basically used, and a plurality of cells (for example, 8 sheets) are stacked to form a module. Furthermore, a plurality of modules may be bundled and have a state called a pack.

  Fig.2 (a) shows an example of the charging / discharging apparatus 101a which performs the charging / discharging test of the secondary battery 150a of a cell state. The charge / discharge device 101a can perform a charge / discharge test with the single converter 102 (1) described in FIG. 1, for example.

  FIG. 2B shows an example of a charging / discharging device 101b that performs a charging / discharging test of the secondary battery 150b in a module state. Since the inter-terminal voltage of the secondary battery 150b is higher than that of the cell shown in FIG. 2A, the charging / discharging device 101b includes, for example, the converter 102 described in FIG. 1 in series with K (K is a positive integer) units. By connecting, the charge / discharge test of the secondary battery 150b is performed.

  FIG. 2C shows an example of a charging / discharging device 101c that performs a charging / discharging test of the packed secondary battery 150c. In the charging / discharging device 101c, the voltage between the terminals of the secondary battery 150c is higher than in the case of the cell in FIG. 2A or the module in FIG. The charging / discharging device 101c performs a charging / discharging test of the secondary battery 150c by connecting the converters 102 described in FIG. 1 in series (N is a positive integer (K <N)) units in series, for example.

  FIG. 3 shows an example of the switch unit 103. The switch unit 103 shown in FIG. 3 is the same block as the switch unit 103 shown in FIG. 1, and the connection of ten converters 102 from the converter 102 (1) to the converter 102 (10) can be freely switched. be able to. For example, a relay or a semiconductor element is used for each switch.

  In FIG. 3, the first switch 201 includes SW (SWitch) 001, SW002, SW003, SW004, SW005, SW006, SW007, SW008, and SW009.

  SW001 is a switch for connecting the negative electrode of converter 102 (1) (denoted by-in FIG. 3 (hereinafter the same)) and the positive electrode of converter 102 (2) (denoted by + in FIG. 3 (hereinafter the same)). is there. For example, by closing SW001, converter 102 (1) and converter 102 (2) are connected in series.

  SW002 is a switch for connecting the negative electrode of the converter 102 (2) and the positive electrode of the converter 102 (3). For example, by closing SW002, converter 102 (2) and converter 102 (3) are connected in series.

  Similarly, SW003 is a switch for connecting the negative electrode of converter 102 (3) and the positive electrode of converter 102 (4). SW004 is a switch for connecting the negative electrode of the converter 102 (4) and the positive electrode of the converter 102 (5). SW005 is a switch for connecting the negative electrode of converter 102 (5) and the positive electrode of converter 102 (6). Similarly, SW006 is a switch for connecting the negative electrode of converter 102 (6) and the positive electrode of converter 102 (7). SW007 is a switch for connecting the negative electrode of the converter 102 (7) and the positive electrode of the converter 102 (8). SW008 is a switch for connecting the negative electrode of converter 102 (8) and the positive electrode of converter 102 (9). Similarly, SW009 is a switch for connecting the negative electrode of the converter 102 (9) and the positive electrode of the converter 102 (10).

  In this way, by connecting the positive and negative electrodes of adjacent converters 102 in succession by the first switch 201, a plurality of converters 102 can be arranged in series. Thus, for example, when a charge / discharge test of the secondary battery 150 having a charge / discharge voltage exceeding the maximum output voltage of one converter 102 is performed, the charge / discharge required for the secondary battery 150 by connecting a plurality of converters 102 in series. A voltage can be obtained. As an example, by closing SW001 and SW002, three converters 102 from converter 102 (1) to converter 102 (3) are connected in series.

  Here, when M (M is a positive integer) converters 102 are connected in series, the first switch 201 is arranged between terminals of different polarities of adjacent converters 102 (M−1). Has a switch.

  In FIG. 3, the second switch 202 has a total of 20 switches, two for each converter 102. For example, SW011 and SW012 are connected to the converter 102 (1), SW021 and SW022 are connected to the converter 102 (2), and SW031 and SW032 are connected to the converter 102 (3). SW041 and SW042 are connected to the converter 102 (4), SW051 and SW052 are connected to the converter 102 (5), and SW061 and SW062 are connected to the converter 102 (6). SW071 and SW072 are connected to converter 102 (7), SW081 and SW082 are connected to converter 102 (8), and SW091 and SW092 are connected to converter 102 (9). Further, SW101 and SW102 are connected to the converter 102 (10). Here, SW011, SW021, SW031, SW041, SW051, SW061, SW071, SW081, SW091, and SW101 are arranged between the positive electrode of each converter 102 and the positive electrode charging / discharging terminal 110 of charging / discharging device 101. Here, SW012, SW022, SW032, SW042, SW052, SW062, SW072, SW082, SW092, and SW102 are arranged between the negative electrode of each converter 102 and the negative electrode charge / discharge terminal 111 of charge / discharge device 101. Accordingly, when all of SW011, SW021, SW031, SW041, SW051, SW061, SW071, SW081, SW091, and SW101 are closed, the positive electrodes of the ten converters 102 are connected to the positive electrode charge / discharge terminal 110 in parallel. Similarly, when all of SW012, SW022, SW032, SW042, SW052, SW062, SW072, SW082, SW092, and SW102 are closed, the negative electrodes of the ten converters 102 are connected to the negative electrode charge / discharge terminal 111 in parallel. Thereby, ten converters 102 are connected in parallel to the secondary battery 150 via the positive electrode charging / discharging terminal 110 and the negative electrode charging / discharging terminal 111.

  In FIG. 3, for example, when the converter 102 (1) and the converter 102 (6) are connected in parallel to the secondary battery 150, the control unit 104 closes SW 011, SW 012, SW 061, and SW 062 and closes the second switch 202. Open the other switch. Here, unlike the series connection of the first switches 201, the parallel connection of the second switches 202 is possible even in the converters 102 that are not adjacent to each other. When M converters 102 are connected in parallel, the second switch 202 has two (M × 2) switches for each converter 102. One switch included in the second switch 202 is disposed between the positive electrode and the positive electrode charging / discharging terminal 110 of each converter 102 and between the negative electrode and the negative electrode charging / discharging terminal 111.

  Further, a plurality of converters 102 connected in series may be used as one charging / discharging circuit group, and a plurality of charging / discharging circuit groups may be connected in parallel. For example, the control unit 104 connects five converters 102 from the converter 102 (1) to the converter 102 (5) in series to form a first charging / discharging circuit group. Similarly, the control unit 104 connects five converters 102 from the converter 102 (6) to the converter 102 (10) in series to form a second charging / discharging circuit group, and the first charging / discharging circuit group and the second charging / discharging circuit group. Connect the discharge circuit group in parallel. Then, the control unit 104 connects the positive electrodes of both the first charge / discharge circuit group and the second charge / discharge circuit group connected in parallel to the positive charge / discharge terminal 110. Similarly, the control unit 104 connects the negative electrodes of both the first charge / discharge circuit group and the second charge / discharge circuit group connected in parallel to the negative charge / discharge terminal 111.

  Thus, the charging / discharging device 101 according to the present embodiment can obtain a charging / discharging voltage and a charging / discharging current corresponding to the type of the secondary battery 150 by connecting the plurality of converters 102 in series or in parallel. .

  FIG. 4 shows an example of a charge / discharge test process. 4 is executed by the control unit 104 of the charging / discharging device 101 shown in FIG.

  In step S <b> 101, the control unit 104 detects the voltage Vb between the terminals of the secondary battery 150 connected to the charging / discharging device 101 by the voltage detection unit 105.

  In step S102, the control unit 104 determines a charge / discharge voltage from the inter-terminal voltage Vb. For example, Vz obtained by adding a preset voltage value (for example, 0.5 V) to the inter-terminal voltage Vb is determined as the charge / discharge voltage. For example, when the secondary battery 150 is a lithium ion type single cell, a terminal voltage Vb of about 3.7 V can be obtained. Therefore, 4.2 V obtained by adding a preset voltage value of 0.5 V is the charge / discharge voltage. Become.

In step S103, the control unit 104 determines the serial number Ns of converters 102 (Ns is a positive integer). Here, assuming that the maximum charge / discharge voltage that can be set per converter 102 is Vc, the series number Ns can be obtained by (Expression 1) or (Expression 2).
Ns = Vz / Vc (when remainder is 0) (Formula 1)
Ns = QUOTIENT (Vz / Vc) +1 (when the remainder is not 0) (Expression 2)
QUOTIENT is a function for obtaining the quotient of (Vz / Vc).
Alternatively, (Expression 2) may be used regardless of whether or not there is a remainder so that the processing is simplified.
For example, when Vz = 4.2V and Vc = 5.0V, the number of series Ns = 1, which can be handled by one converter 102. For example, when Vz = 20V and Vc = 5.0V, the series number Ns = 4, and four converters 102 may be connected in series. In this manner, the control unit 104 determines the serial number Ns of the converters 102.

In step S104, control unit 104 determines the parallel number Np (Np is a positive integer) of converter 102. Here, the control unit 104 compares the serial number Ns determined in step S103 with the total number Nz of converters 102 (Nz is a positive integer), and can be connected in parallel when (Equation 3) is satisfied. Judge that there is.
Nz ≧ Ns × 2 (Formula 3)
For example, in the case of FIG. 3, since the total number Nz of converters 102 is 10, the control unit 104 determines that parallel connection is possible when Ns ≦ 5 is satisfied (when the series number Ns is 5 or less). . And when (Formula 3) is satisfy | filled, the parallel number Np can be calculated | required by (Formula 4).
Np = QUOTIENT (Nz / Ns) (Formula 4)
QUOTIENT is a function for obtaining the quotient of (Nz / Ns).
For example, when Nz = 10 units and Ns = 5 units, the parallel number Np = 2, and the control unit 104 connects two charge / discharge circuit groups in which five converters 102 are connected in series. For example, when Nz = 10 and Ns = 3, the parallel number Np = 3, and the control unit 104 connects three charge / discharge circuit groups in which three converters 102 are connected in series. In this case, one converter 102 that does not belong to any of the three charge / discharge circuit groups is not used.

  In step S105, the control unit 104 controls opening and closing of the switch unit 103 based on the series number Ns and the parallel number Np determined in steps S103 and S104.

  Thus, the charging / discharging device 101 according to the present embodiment detects the inter-terminal voltage Vb of the secondary battery 150 and determines the charging / discharging voltage. And the charging / discharging apparatus 101 can perform the charging / discharging test of the secondary battery 150 by connecting the several converter 102 in series or in parallel according to the determined charging / discharging voltage. As a result, the charging / discharging device 101 according to the present embodiment can be used in various types without the operator setting the charging / discharging device 101 according to the type of the secondary battery 150 connected to the charging / discharging device 101. A charge / discharge test corresponding to the secondary battery 150 can be performed.

Here, the number of the plurality of converters 102 is Nz, the maximum charge / discharge voltage of each converter 102 is Vc, and the charge / discharge voltage of the secondary battery 150 is Vz. And the charging / discharging apparatus 101 which concerns on this embodiment sets the some charging / discharging circuit group of the number equivalent to the quotient of (Formula 5), when the conditions of (Formula 5) are satisfy | filled.
The quotient of (Vc × Nz) / Vz ≧ 2 (Equation 5)
Thus, the combination of the plurality of converters 102 can be determined according to the charge / discharge voltage of the secondary battery 150.
(Application examples)
Here, in the secondary battery 150, the inter-terminal voltage Vb may vary depending on the charging rate. For example, when the remaining capacity of the secondary battery 150 connected to the charging / discharging device 101 is in a discharge state of several percent or less, the inter-terminal voltage Vb is lower than in a state where the secondary battery 150 is sufficiently charged. The charging / discharging voltage may be set incorrectly. Therefore, in step S102, the control unit 104 may precharge the secondary battery 150 when measuring the inter-terminal voltage Vb of the secondary battery 150. The preliminary charging is performed for a short time (for example, 1 minute) at a charging voltage that is 0.5 V higher than the terminal-to-terminal voltage Vb of the secondary battery 150 detected first, and the converter 102 and the secondary battery 150 are connected. Separately, the control unit 104 confirms the voltage Vb between the terminals of the secondary battery 150. If the difference between the second inter-terminal voltage Vb and the first inter-terminal voltage Vb is within a preset range, the control unit 104 determines the charge / discharge voltage based on the first inter-terminal voltage Vb. To do. If the difference between the second inter-terminal voltage Vb and the first inter-terminal voltage Vb is outside the preset range, the control unit 104 performs preliminary charging again, and the third inter-terminal voltage Vb. Confirm. If the difference between the third inter-terminal voltage Vb and the second inter-terminal voltage Vb is within a preset range, the controller 104 determines the charge / discharge voltage based on the second inter-terminal voltage Vb. To decide. If the difference between the third inter-terminal voltage Vb and the second inter-terminal voltage Vb is outside the preset range, the control unit 104 performs the preliminary charging again, and the fourth inter-terminal voltage Vb. Check Vb. Hereinafter, the control unit 104 determines the charge / discharge voltage by repeating the same operation until the voltage fluctuation of the secondary battery 150 is stabilized.

Thus, since the charging / discharging apparatus 101 which concerns on this embodiment can detect the voltage Vb between the terminals of the secondary battery 150 reliably, it can prevent the failure of the test by the setting error etc. of charging / discharging voltage.
(Combination example of charge / discharge circuit)
Hereinafter, an example of a combination of a plurality of converters 102 in the charge / discharge device 101 according to the present embodiment will be described.

  FIG. 5 shows an example of the correspondence with the open / close pattern corresponding to the charge / discharge voltage output to the secondary battery 150. Here, FIG. 5 is an example of the table 131a shown in FIG. The table 131a shows ten types of connection pattern examples (pattern 1 to pattern 10) in which the series number Ns of the ten converters 102 shown in FIG. 1 is different. In FIG. 5, the series number Ns, the parallel number Np, and the remainder of the converter 102 are different for each pattern. Here, the series number Ns and the parallel number Np of the converter 102 are obtained based on (Expression 1) to (Expression 4).

  In FIG. 5, since the number of series Ns is 1 in the pattern 1, each converter 102 is connected to the secondary battery 150, and can correspond to the charge / discharge voltage V1. Further, since the parallel number Np is 10, ten converters 102 are connected in parallel. Furthermore, since the remainder is zero, the number of converters 102 that are not used is zero.

  In the pattern 2, since the series number Ns is 2, two converters 102 are connected in series and can correspond to the charge / discharge voltage V2. Further, since the parallel number Np is 5, five groups (groups of charge / discharge circuits) in which two converters 102 are connected in series are connected in parallel. In this case, since all ten converters 102 are used, the number of unused converters 102 is zero.

  In the pattern 3, since the number of series Ns is 3, three converters 102 are connected in series and can cope with the charge / discharge voltage V3. Further, since the parallel number Np is 3, three groups in which three converters 102 are connected in series are connected in parallel. In this case, since nine converters 102 are used, the number of converters 102 that are not used is one.

  Similarly, in the pattern 4, the converter 102 has a series number Ns of 4, a parallel number Np of 2, and a remainder of 2, and can correspond to the charge / discharge voltage V4. In the pattern 5, the converter 102 has a series number Ns of 5, a parallel number Np of 2, and a remainder of 0, and can correspond to the charge / discharge voltage V5.

  Here, since the patterns 6 to 10 do not satisfy (Equation 3), the parallel number Np is all 0, and all the converters 102 not connected in series have a remainder. For example, since the number Ns of series in the pattern 6 is 6, six converters 102 are connected in series and can cope with the charge / discharge voltage V6. Since the parallel number Np is 0, the number of converters 102 that are not used is four. Similarly, in the pattern 7, the converter 102 has a series number Ns of 7, a parallel number Np of 0, and a remainder of 3, and can correspond to the charge / discharge voltage V7. In the pattern 8, the converter 102 has a series number Ns of 8, a parallel number Np of 0, and a remainder of 2, and can correspond to the charge / discharge voltage V8. In the pattern 9, the series number Ns of the converters 102 is 9, the parallel number Np is 0, and the remainder is 1, and can correspond to the charge / discharge voltage V9. In the pattern 10, the converter 102 has a series number Ns of 10, a parallel number Np of 0, and a remainder of 0, and can handle the charge / discharge voltage V10.

  FIG. 6 shows an open / close example of the switch unit 103 of the pattern 1 and the pattern 2 shown in FIG. Here, FIG. 6 is an example of the table 131b shown in FIG. FIG. 6A shows an opening / closing example of the switch unit 103 in the case of pattern 1 (Ns = 1, Np = 10). In FIG. 6A, the state of SW001 to SW009 of the first switch 201 is an open state (indicated as OFF in FIG. 6), and there is no converter 102 connected in series. The state of SW011 to SW102 of the second switch 202 is a closed state (indicated as ON in FIG. 6), and ten converters 102 are connected in parallel.

  On the other hand, FIG. 6B shows an opening / closing example of the switch unit 103 in the case of the pattern 2 (Ns = 2, Np = 5). In FIG. 6B, among the switches SW001 to SW009 of the first switch 201, the odd-numbered switch is in the closed state, and the even-numbered switch is in the open state. In addition, SW011, SW022, SW031, SW042, SW051, SW062, SW071, SW082, SW091, and SW102 of the second switch 202 are closed. Furthermore, SW012, SW021, SW032, SW041, SW052, SW061, SW072, SW081, SW092, and SW101 of the second switch 202 are in an open state.

  FIG. 7 shows the open / close state of the first switch 201 and the second switch 202 of the pattern 1 shown in FIG. In FIG. 7, the positive electrodes of converters 102 (1) to 102 (10) are connected to positive electrode charge / discharge terminal 110, and the negative electrodes of converters 102 (1) to 102 (10) are connected to negative electrode charge / discharge terminal 111. . In this way, the charging / discharging device 101 can perform a charging / discharging test of the secondary battery 150. By connecting 10 converters 102 in parallel, for example, even when the maximum charge / discharge current of each converter 102 is 3A, a charge / discharge current of up to 30A can be supplied to the secondary battery 150.

  FIG. 8 shows the open / close state of the first switch 201 and the second switch 202 of the pattern 2 shown in FIG. In FIG. 8, converter 102 (1) and converter 102 (2) form group G1, and converter 102 (3) and converter 102 (4) form group G2. Similarly, converter 102 (5) and converter 102 (6) form group G3, converter 102 (7) and converter 102 (8) form group G4, and converter 102 (9) and converter 102 (10) form group G5, respectively. To do. And the positive electrode of the converter 102 (1) is used as the positive electrode of the group G 1, and is connected to the positive electrode charge / discharge terminal 110. The negative electrode of group G1 uses the negative electrode of converter 102 (2) and is connected to negative electrode charge / discharge terminal 111. Further, the positive electrode of the converter 102 (3) is used as the positive electrode of the group G2, and the negative electrode of the converter 102 (4) is used as the negative electrode of the group G2. Similarly, the positive electrode of the converter 102 (5) is used as the positive electrode of the group G3, and the negative electrode of the converter 102 (6) is used as the negative electrode of the group G3. Further, the positive electrode of the converter 102 (7) is used as the positive electrode of the group G4, and the negative electrode of the converter 102 (8) is used as the negative electrode of the group G4. Further, the positive electrode of the converter 102 (9) is used as the positive electrode of the group G5, and the negative electrode of the converter 102 (10) is used as the negative electrode of the group G5. As described above, five charge / discharge groups from group G1 to group G5 in which two adjacent converters 102 are connected in series are obtained. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 10V can be applied to the secondary battery 150. In addition, since the five charge / discharge groups from group G1 to group G5 are connected in parallel, for example, even when the maximum charge / discharge current of each converter 102 is 3A, the charge / discharge current of up to 15A flows to the secondary battery 150. be able to.

  FIG. 9 shows an open / close example of the switch unit 103 of the pattern 3 and the pattern 4 shown in FIG. Here, FIG. 9 is an example of the table 131b shown in FIG. FIG. 9A shows an example of opening and closing of the switch unit 103 in the case of pattern 3 (Ns = 3, Np = 3). In FIG. 9A, SW003, SW006, and SW009 of the first switch 201 are open. The switches other than SW003, SW006, and SW009 of the first switch 201 are closed. Further, SW011, SW032, SW041, SW062, SW071, and SW092 of the second switch 202 are closed. Note that the switches other than SW011, SW032, SW041, SW062, SW071, and SW092 of the second switch 202 are in an open state. As a result, three groups in which the three converters 102 are connected in series are formed, and further, the three groups are connected in parallel.

  On the other hand, FIG. 9B shows an open / close example of the switch unit 103 in the case of the pattern 4 (Ns = 4, Np = 2). In FIG. 9B, SW004, SW008 and SW009 of the first switch 201 are in an open state. The switches other than SW004, SW008, and SW009 of the first switch 201 are closed. In addition, SW011, SW042, SW051, and SW082 of the second switch 202 are closed. It should be noted that the switches other than SW011, SW042, SW051, and SW082 of the second switch 202 are in an open state. As a result, four groups in which four converters 102 are connected in series are formed, and further, the four groups are connected in parallel.

  FIG. 10 shows the open / closed state of the first switch 201 and the second switch 202 of the pattern 3 shown in FIG. In FIG. 10, converters 102 (1) to 102 (3) form group G1, and converters 102 (4) to 102 (6) form group G2. Similarly, converters 102 (7) to 102 (9) form group G3. Converter 102 (10) is redundant and is not used. In this way, three charge / discharge groups from group G1 to group G3 in which three adjacent converters 102 are connected in series are obtained. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 15V can be applied to the secondary battery 150. Further, since the three charge / discharge groups from group G1 to group G3 are connected in parallel, for example, even when the maximum charge / discharge current of each converter 102 is 3A, the charge / discharge current of up to 9A is caused to flow to the secondary battery 150. be able to.

  FIG. 11 shows the open / closed state of the first switch 201 and the second switch 202 of the pattern 4 shown in FIG. In FIG. 11, converters 102 (1) to 102 (4) form group G1, and converters 102 (5) to 102 (8) form group G2. Converter 102 (9) and converter 102 (10) are redundant and are not used. In this way, two charge / discharge groups of group G1 and group G2 in which four converters 102 adjacent to each other are connected in series are obtained. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 20V can be applied to the secondary battery 150. In addition, since the two charging / discharging groups of group G1 and group G2 are connected in parallel, for example, even when the maximum charging / discharging current of each converter 102 is 3A, the charging / discharging current up to 6A is allowed to flow to secondary battery 150. Can do.

  FIG. 12 shows an open / close example of the switch unit 103 of the pattern 5 and the pattern 6 shown in FIG. Here, FIG. 12 is an example of the table 131b shown in FIG. FIG. 12A shows an opening / closing example of the switch unit 103 in the case of the pattern 5 (Ns = 5, Np = 2). In FIG. 12A, SW005 of the first switch 201 is in an open state. The first switches 201 other than SW005 are in a closed state. In addition, SW011, SW052, SW061, and SW102 of the second switch 202 are closed. It should be noted that the switches other than SW011, SW052, SW061, and SW102 of the second switch 202 are in an open state. Thereby, two groups in which five converters 102 are connected in series are formed, and further, the two groups are connected in parallel.

  On the other hand, FIG. 12B shows an opening / closing example of the switch unit 103 in the case of the pattern 6 (Ns = 6, Np = 0). In FIG. 12B, SW001, SW002, SW003, SW004, and SW005 of the first switch 201 are closed. SW006, SW007, SW008 and SW009 of the first switch 201 are open. Further, SW011 and SW062 of the second switch 202 are closed. Note that switches other than SW011 and SW062 of the second switch 202 are in an open state. Thereby, one group in which six converters 102 are connected in series is formed. Here, the remaining four converters 102 are not used.

  FIG. 13 shows the open / closed state of the first switch 201 and the second switch 202 of the pattern 5 shown in FIG. In FIG. 13, converters 102 (1) to 102 (5) form group G1, and converters 102 (6) to 102 (10) form group G2. In this manner, two charge / discharge groups of group G1 and group G2 in which five adjacent converters 102 are connected in series are obtained. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 25V can be applied to the secondary battery 150. In addition, since the two charging / discharging groups of group G1 and group G2 are connected in parallel, for example, even when the maximum charging / discharging current of each converter 102 is 3A, the charging / discharging current up to 6A is allowed to flow to secondary battery 150. Can do.

  FIG. 14 shows the open / close state of the first switch 201 and the second switch 202 of the pattern 6 shown in FIG. In FIG. 14, converters 102 (1) to 102 (6) form group G1. Converters 102 (7) to 102 (10) are redundant and are not used. Thus, one charging / discharging group in which six converters 102 adjacent to each other are connected in series is obtained. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 30V can be applied to the secondary battery 150. In the example of FIG. 14, since the converters 102 are not connected in parallel, the charge / discharge current that can be passed through the secondary battery 150 is the same as the maximum charge / discharge current (3A) of one converter 102.

  Here, the pattern 7 to the pattern 10 shown in FIG. 5 are only connected in series without the converter 102 connected in parallel like the pattern 6 demonstrated in FIG. The number of converters 102 connected in series is 7 for pattern 7, 8 for pattern 8, 9 for pattern 9, and 10 for pattern 10.

  For example, in the case of the pattern 7, in FIG. 3, the positive electrode of the converter 102 (1) connected in series is connected to the positive electrode charging / discharging terminal 110, and the negative electrode of the converter 102 (7) is connected to the negative electrode charging / discharging terminal 111. At this time, SW001 to SW006 of the first switch 201 are in a closed state, and SW007 to SW009 are in an open state. In the second switch 202, SW011 and SW072 are closed, and the other switches of the second switch 202 are open. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 35V can be applied to the secondary battery 150. As in the case of FIG. 14, the converters 102 are not connected in parallel, so the charge / discharge current that can be passed through the secondary battery 150 is the same as the maximum charge / discharge current (3A) of one converter 102.

  In the case of pattern 8, in FIG. 3, the positive electrode of the converter 102 (1) connected in series is connected to the positive electrode charging / discharging terminal 110, and the negative electrode of the converter 102 (8) is connected to the negative electrode charging / discharging terminal 111. . At this time, SW001 to SW007 of the first switch 201 are closed, and SW008 and SW009 are open. In the second switch 202, SW011 and SW082 are closed, and the other switches of the second switch 202 are open. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 40V can be applied to the secondary battery 150. Note that the charge / discharge current that can flow through the secondary battery 150 is the same as the maximum charge / discharge current (3A) of one converter 102.

  Similarly, in the case of the pattern 9, in FIG. 3, the positive electrode of the converter 102 (1) connected in series is connected to the positive electrode charging / discharging terminal 110, and the negative electrode of the converter 102 (9) is connected to the negative electrode charging / discharging terminal 111. The At this time, SW001 to SW008 of the first switch 201 are closed and SW009 is open. In the second switch 202, SW011 and SW092 are closed, and the other switches of the second switch 202 are open. Thereby, the charging / discharging apparatus 101 can give the charging / discharging voltage up to 45V to the secondary battery 150, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V. Note that the charge / discharge current that can flow through the secondary battery 150 is the same as the maximum charge / discharge current (3A) of one converter 102.

  In the case of pattern 10, in FIG. 3, the positive electrode of converter 102 (1) is connected to positive electrode charge / discharge terminal 110, and the negative electrode of converter 102 (10) is connected to negative electrode charge / discharge terminal 111. At this time, all the switches of the first switch 201 are closed. In the second switch 202, SW011 and SW102 are closed, and the other switches of the second switch 202 are open. Thereby, for example, even when the maximum charging / discharging voltage of each converter 102 is 5V, the charging / discharging voltage up to 50V can be applied to the secondary battery 150. Note that the charge / discharge current that can flow through the secondary battery 150 is the same as the maximum charge / discharge current (3A) of one converter 102.

  As described above, the charging / discharging device 101 according to the present embodiment can connect a plurality of converters 102 having the same function in series or in parallel with the switch unit 103 and connect to the secondary battery 150. Then, the charging / discharging device 101 detects the voltage between the terminals of the secondary battery 150 and switches the switch unit 103 according to the charging / discharging voltage determined based on the voltage between the terminals, thereby obtaining a desired charging / discharging voltage. It can be generated and given to the secondary battery 150.

  From the above detailed description, features and advantages of the embodiments will become apparent. This is intended to cover the features and advantages of the embodiments described above without departing from the spirit and scope of the claims. Also, any improvement and modification should be readily conceivable by those having ordinary knowledge in the art. Therefore, there is no intention to limit the scope of the inventive embodiments to those described above, and appropriate modifications and equivalents included in the scope disclosed in the embodiments can be used.

101, 101a, 101b, 101c... Charging / discharging device; 102, 102 (1), 102 (2), 102 (3), 102 (4), 102 (5), 102 (6), 102 (7) , 102 (8), 102 (9), 102 (10)... Converter; 103... Switch unit; 104. ... Control terminal; 110 ... Positive electrode charge / discharge terminal; 111 ... Negative electrode charge / discharge terminal; 112 ... Positive electrode terminal; 113 ... Negative electrode terminal; 131, 131a, 131b ... Table; 150a, 150b, 150c ... secondary battery; 201 ... first switch; 202 ... second switch

Claims (8)

In a charge / discharge device for performing a charge / discharge test of a secondary battery,
A plurality of charge / discharge circuits;
A plurality of switches for connecting the plurality of charge / discharge circuits in series or in parallel;
A detection unit for detecting a voltage between terminals of the secondary battery;
Control for determining a charge / discharge voltage to be output to the secondary battery based on the inter-terminal voltage, and controlling a combination of the plurality of charge / discharge circuits by opening and closing the plurality of switches so as to be the charge / discharge voltage. A charge / discharge device comprising: a portion. The charging / discharging device according to claim 1,
A storage unit storing a table indicating correspondence between the charge / discharge voltage output to the secondary battery and the opening / closing patterns of the plurality of switches;
The control unit refers to the table, obtains an opening / closing pattern of the plurality of switches corresponding to a charge / discharge voltage output to the secondary battery, and controls opening / closing of the plurality of switches based on the opening / closing pattern. A charging / discharging device. In the charging / discharging device according to claim 1 or 2,
The plurality of switches include a first switch that connects the charging / discharging circuits adjacent to each other of the plurality of charging / discharging circuits in series, and a second switch that connects the plurality of charging / discharging circuits in parallel.
The control unit controls the first switch according to a charge / discharge voltage output to the secondary battery, and controls the second switch according to a charge / discharge current output to the secondary battery. Charging / discharging device. The charging / discharging device according to claim 3,
When the number of the plurality of charge / discharge circuits is Nz (Nz is a positive integer), the maximum output voltage of the charge / discharge circuit is Vc, and the charge / discharge voltage output to the secondary battery is Vz. When the quotient of (Vc × Nz) / Vz is 2 or more, a plurality of charge / discharge circuit groups corresponding to the quotient are set, and the plurality of charge / discharge circuits in each of the charge / discharge circuit groups are set. The charging / discharging device, wherein the first switch is connected in series, and the plurality of charging / discharging circuit groups are connected in parallel by the second switch. A charge / discharge voltage switching method in a charge / discharge device for performing a charge / discharge test of a secondary battery,
A charge / discharge voltage to be output to the secondary battery is determined by detecting a voltage between terminals of the secondary battery, and a plurality of switches connecting a plurality of charge / discharge circuits in series or in parallel are opened and closed to the charge / discharge voltage. The charging / discharging voltage switching method characterized by controlling the combination of said several charging / discharging circuit so that it may become. In the charging / discharging voltage switching method according to claim 5,
Opening / closing the plurality of switches corresponding to the charging / discharging voltage output to the secondary battery with reference to a table indicating correspondence between the charging / discharging voltages output to the secondary battery and the opening / closing patterns of the plurality of switches. A charge / discharge voltage switching method characterized by acquiring a pattern and controlling opening and closing of the plurality of switches. In the charging / discharging voltage switching method according to claim 5 or 6,
The plurality of switches include a first switch that connects the charge / discharge circuits adjacent to each other of the plurality of charge / discharge circuits in series, and a second switch that connects the plurality of charge / discharge circuits in parallel, A charge / discharge voltage switching method comprising: controlling the first switch according to a charge / discharge voltage output to a secondary battery; and controlling the second switch according to a charge / discharge current output to the secondary battery. . The charge / discharge voltage switching method according to claim 7,
When the number of the plurality of charging / discharging circuits is Nz (Nz is a positive integer), the maximum output voltage of the charging / discharging circuit is Vc, and the charging / discharging voltage output to the secondary battery is Vz, (Vc × Nz) ) / Vz when the quotient is 2 or more, a plurality of charge / discharge circuit groups corresponding to the quotient are set, and the plurality of charge / discharge circuits in each of the charge / discharge circuit groups are set by the first switch. A charge / discharge voltage switching method comprising: connecting in series, and further connecting the plurality of charge / discharge circuit groups in parallel by the second switch.

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