Energy storage battery test system

Abstract

The utility model provides an energy storage battery testing system. The energy storage battery test system comprises a first switch tube, a first resistor, a second resistor, a third resistor and a plurality of load branches connected in parallel, each load branch is provided with a second switch tube, a first end of the first switch tube is connected with a charging power supply, a second end of the first switch tube is connected with a first end of the first resistor, and a second end of the third resistor is connected with a second end of the third resistor. The second end of the first resistor is connected with the positive electrode of the battery, the negative electrode of the battery is grounded, the first end of the second resistor is connected with the positive electrode of the battery, the second end of the second resistor is grounded through the third resistor, the load branches are connected with the third resistor in parallel, and the control end of the first switch tube and the control end of the second switch tube are both connected with the controller. The problem that an existing energy storage battery testing system is high in cost can be solved.

Description

Technical Field

[0001] The present disclosure relates to the field of power supply technology, and in particular to an energy storage battery testing system. Background Art

[0002] Energy storage batteries are devices that convert electrical energy into chemical energy and then back into electrical energy when needed. They play an important role in many fields. In order to timely discover potential safety hazards of energy storage batteries in actual operation and prevent safety accidents of energy storage batteries, it is necessary to test energy storage batteries regularly. The test contents include battery capacity test, voltage test, internal resistance test and charge and discharge test, etc. Each test requires special test equipment and the test cost is high. Utility Model Content

[0003] The disclosed embodiments provide an energy storage battery testing system to solve the problem of high cost of existing energy storage battery testing systems.

[0004] The embodiment of the present disclosure provides an energy storage battery testing system, comprising a first switch tube, a first resistor, a second resistor, a third resistor and a plurality of parallel load branches, each of the load branches is provided with a second switch tube,

[0005] The first end of the first switch tube is connected to the charging power supply, the second end of the first switch tube is connected to the first end of the first resistor, the second end of the first resistor is connected to the positive electrode of the battery, and the negative electrode of the battery is grounded.

[0006] The first end of the second resistor is connected to the positive electrode of the battery, the second end of the second resistor is grounded through a third resistor, and the plurality of load branches are connected in parallel with the third resistor.

[0007] The control end of the first switch tube and the control end of the second switch tube are both connected to the controller.

[0008] In an exemplary embodiment of the present disclosure, the energy storage battery testing system further includes a charging current detection circuit, wherein the charging current detection circuit includes a resistor R7, a resistor R8 and an operational amplifier U1A.

[0009] The non-inverting input terminal of the operational amplifier U1A is connected to the first end of the first resistor, the inverting input terminal of the operational amplifier U1A is connected to the second end of the first resistor, and the output terminal of the operational amplifier U1A is feedback-connected to the inverting input terminal of the operational amplifier U1A through the resistor R8.

[0010] The output end of the operational amplifier U1A is the output end of the charging current detection circuit.

[0011] In an exemplary embodiment of the present disclosure, the energy storage battery testing system further includes a discharge current detection circuit, wherein the discharge current detection circuit includes a resistor R10, a resistor R9 and an operational amplifier U1B.

[0012] The non-inverting input terminal of the operational amplifier U1B is connected to the first terminal of the second resistor, the inverting input terminal of the operational amplifier U1B is connected to the second terminal of the second resistor, and the output terminal of the operational amplifier U1B is feedback-connected to the inverting input terminal of the operational amplifier U1B through the resistor R9.

[0013] The output end of the operational amplifier U1B is the output end of the discharge current detection circuit.

[0014] In an exemplary embodiment of the present disclosure, the energy storage battery testing system further includes a battery voltage detection circuit, wherein the battery voltage detection circuit includes a resistor R13, a resistor R14 and an operational amplifier U2A.

[0015] The non-inverting input terminal of the operational amplifier U2A is connected to the second end of the second resistor, the inverting input terminal of the operational amplifier U2A is grounded through a resistor R13, and the output terminal of the operational amplifier U2A is feedback-connected to the inverting input terminal of the operational amplifier U2A through a resistor R14.

[0016] The output end of the operational amplifier U2A is the output end of the battery voltage detection circuit.

[0017] In an exemplary embodiment of the present disclosure, the energy storage battery test system further includes a battery power detection circuit, wherein the battery power detection circuit includes a first selection switch, a second selection switch and a power monitoring module.

[0018] The first selection input end of the first selection switch is connected to the first end of the first resistor, the second selection input end of the first selection switch is connected to the second end of the first resistor, and the output end of the first selection switch is connected to the current input positive end of the power monitoring module.

[0019] The first selection input terminal of the second selection switch is connected to the second terminal of the first resistor, the second selection input terminal of the second selection switch is connected to the second terminal of the second resistor, and the output terminal of the second selection switch is connected to the negative current input terminal of the power monitoring module.

[0020] The output end of the power monitoring module is connected to the controller.

[0021] The energy storage battery testing system provided by the embodiment of the present disclosure has the following working principles and beneficial effects:

[0022] In the embodiment of the present disclosure, when the first switch tube is turned on and the second switch tube is turned off, the charging power supply charges the battery, and the change of the charging current can be monitored in real time by detecting the current of the first resistor in real time. The second resistor and the third resistor form a resistor voltage divider circuit, and the change of the charging voltage can be monitored in real time by detecting the terminal voltage of the third resistor in real time; when the first switch tube is turned off and any one or more of the second switch tubes are turned on, the battery discharges through the load branch, and the change of the discharge current can be monitored in real time by detecting the current of the second resistor in real time, and the change of the discharge voltage can be monitored in real time by detecting the terminal voltage of the third resistor in real time. By controlling different second switch tubes to be turned on, the discharge detection of the battery under different load conditions can be realized.

[0023] The disclosed embodiment can realize battery charge and discharge detection simultaneously by controlling the conduction of a first switch tube and a plurality of second switch tubes. Meanwhile, by controlling the conduction of different second switch tubes, battery discharge detection under different load conditions can be realized. The circuit structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 is a circuit schematic diagram of an energy storage battery testing system provided by an embodiment of the present disclosure;

[0026] Figure 2 is a schematic diagram of a charging current detection circuit provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of a discharge current detection circuit provided by an embodiment of the present disclosure;

[0028] Figure 4 is a schematic diagram of a battery voltage detection circuit provided by an embodiment of the present disclosure;

[0029] Figure 5 It is a schematic diagram of a battery power detection circuit provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0031] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0032] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:

[0033] Figure 1 This is a circuit diagram of the energy storage battery testing system provided by the embodiment of the present disclosure. Figure 1 The energy storage battery test system includes a first switch tube, a first resistor, a second resistor, a third resistor and a plurality of parallel load branches, each load branch is provided with a second switch tube,

[0034] The first end of the first switch tube is connected to the charging power supply, the second end of the first switch tube is connected to the first end of the first resistor, the second end of the first resistor is connected to the positive electrode of the battery, and the negative electrode of the battery is grounded.

[0035] A first end of the second resistor is connected to the positive electrode of the battery, a second end of the second resistor is grounded through a third resistor, and a plurality of load branches are connected in parallel with the third resistor.

[0036] The control end of the first switch tube and the control end of the second switch tube are both connected to the controller.

[0037] In this embodiment, when the first switch tube Q1 is turned on and the second switch tubes Q2 to Q5 are turned off, the charging power supply charges the battery B1, and the change of the charging current can be monitored in real time by detecting the current of the first resistor R1 in real time. The second resistor R2 and the third resistor R3 form a resistor voltage divider circuit, and the change of the charging voltage can be monitored in real time by detecting the terminal voltage of the third resistor R3 in real time; when the first switch tube Q1 is turned off and any one or more of the second switch tubes Q2 to Q5 are turned on, the battery B1 is discharged through the load branch, and the change of the discharge current can be monitored in real time by detecting the current of the second resistor R2 in real time, and the change of the discharge voltage can be monitored in real time by detecting the terminal voltage of the third resistor R3 in real time. By controlling different second switch tubes Q2 to Q5 to be turned on, the discharge detection of the battery under different load conditions can be realized.

[0038] The disclosed embodiment can simultaneously realize the charge and discharge detection of the battery B1 by controlling the conduction of the first switch tube Q1 and multiple second switch tubes Q2~Q5. At the same time, by controlling the conduction of different second switch tubes Q2~Q5, the discharge detection of the battery B1 under different load conditions can be realized. The circuit structure is simple and the cost is low.

[0039] Reference Figure 2 In an exemplary embodiment of the present disclosure, the energy storage battery testing system further includes a charging current detection circuit, the charging current detection circuit includes a resistor R7, a resistor R8 and an operational amplifier U1A,

[0040] The non-inverting input terminal of the operational amplifier U1A is connected to the first end of the first resistor, the inverting input terminal of the operational amplifier U1A is connected to the second end of the first resistor, and the output terminal of the operational amplifier U1A is feedback-connected to the inverting input terminal of the operational amplifier U1A through the resistor R8.

[0041] The output of the operational amplifier U1A is the output of the charging current detection circuit.

[0042] In this embodiment, resistors R7, R8 and operational amplifier U1A constitute a subtraction circuit for outputting the voltage across the first resistor R1. The first resistor R1 is connected in series in the charging circuit of the battery B1. Therefore, the magnitude of the charging current can be obtained by detecting the voltage across the first resistor R1.

[0043] The output voltage of the operational amplifier U1A can be input to the controller, and the controller reads the output voltage data of the operational amplifier U1A, calculates the charging current data based on it, and stores it.

[0044] Reference Figure 3 In an exemplary embodiment of the present disclosure, the energy storage battery testing system further includes a discharge current detection circuit, the discharge current detection circuit includes a resistor R10, a resistor R9 and an operational amplifier U1B,

[0045] The non-inverting input terminal of the operational amplifier U1B is connected to the first end of the second resistor, the inverting input terminal of the operational amplifier U1B is connected to the second end of the second resistor, and the output terminal of the operational amplifier U1B is connected to the inverting input terminal of the operational amplifier U1B through the resistor R9.

[0046] The output end of the operational amplifier U1B is the output end of the discharge current detection circuit.

[0047] In this embodiment, the resistor R10, the resistor R9 and the operational amplifier U1B constitute a subtraction circuit for outputting the voltage across the second resistor R2. The second resistor R2 is connected in series in the discharge circuit of the battery B1. Therefore, the magnitude of the discharge current can be obtained by detecting the voltage across the second resistor R2.

[0048] The output voltage of the operational amplifier U1B can be input to the controller, and the controller reads the output voltage data of the operational amplifier U1B, calculates the discharge current data based on the data, and stores the data.

[0049] Reference Figure 4 In an exemplary embodiment of the present disclosure, the energy storage battery testing system further includes a battery voltage detection circuit, the battery voltage detection circuit includes a resistor R13, a resistor R14 and an operational amplifier U2A,

[0050] The non-inverting input terminal of the operational amplifier U2A is connected to the second end of the second resistor, the inverting input terminal of the operational amplifier U2A is grounded through the resistor R13, and the output terminal of the operational amplifier U2A is feedback-connected to the inverting input terminal of the operational amplifier U2A through the resistor R14.

[0051] The output terminal of the operational amplifier U2A is the output terminal of the battery voltage detection circuit.

[0052] In this embodiment, the resistor R13, the resistor R14 and the operational amplifier U2A constitute an in-phase proportional amplifier circuit, which is used to amplify the terminal voltage of the third resistor R3 to a set voltage level. Since the branch formed by the second resistor R2 and the third resistor R3 is connected in parallel with the battery B1, the voltage of the third resistor R3 is proportional to the battery voltage, and the battery voltage can be obtained by detecting the terminal voltage of the third resistor R3.

[0053] The output voltage of the operational amplifier U2A can be input to the controller, and the controller reads the output voltage data of the operational amplifier U2A, calculates the battery voltage data accordingly, and stores it.

[0054] Reference Figure 5 In an exemplary embodiment of the present disclosure, the energy storage battery test system further includes a battery power detection circuit, the battery power detection circuit includes a first selection switch, a second selection switch and a power monitoring module,

[0055] The first selection input terminal of the first selection switch is connected to the first end of the first resistor, the second selection input terminal of the first selection switch is connected to the second end of the first resistor, and the output terminal of the first selection switch is connected to the current input positive terminal of the power monitoring module.

[0056] The first selection input terminal of the second selection switch is connected to the second terminal of the first resistor, the second selection input terminal of the second selection switch is connected to the second terminal of the second resistor, and the output terminal of the second selection switch is connected to the negative current input terminal of the power monitoring module.

[0057] The output end of the power monitoring module is connected to the controller.

[0058] In this embodiment, the charging current can be obtained by detecting the voltage across the first resistor R1, and the two ends of the first resistor R1 are respectively connected to the current input positive terminal SENSE+ and the current input negative terminal SENSE- of the power monitoring module U3, and the power monitoring module U3 can accumulate the charging current to obtain the battery power; similarly, the discharging current can be obtained by detecting the voltage across the second resistor R2, and the two ends of the second resistor R2 are respectively connected to the current input positive terminal SENSE+ and the current input negative terminal SENSE- of the power monitoring module U3, and the power monitoring module U3 can accumulate the discharge current to obtain the battery power.

[0059] In order to further simplify the circuit, the present embodiment realizes the reuse of the power monitoring module U3 by setting the first selection switch U4 and the second switch U5. Specifically, when performing a battery charging test, the B0 end of the first selection switch U4 and the B0 end of the second selection switch U5 can be selected, and the two ends of the first resistor R1 are respectively connected to the current input positive end SENSE+ and the current input negative end SENSE- of the power monitoring module U3, and the power monitoring module U3 can accumulate the charging current to obtain the battery power; when performing a battery discharging test, the B1 end of the first selection switch U4 and the B1 end of the second selection switch U5 can be selected, and the two ends of the second resistor R2 are respectively connected to the current input positive end SENSE+ and the current input negative end SENSE- of the power monitoring module U3, and the power monitoring module U3 can accumulate the discharge current to obtain the battery power.

[0060] The controller may be a currently commonly used single-chip microcomputer, DSP, ARM or other microcontroller, and there is no limitation here.

[0061] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. Energy storage battery testing system, characterized in that: The invention comprises a first switch tube, a first resistor, a second resistor, a third resistor and a plurality of parallel load branches, each of the load branches is provided with a second switch tube, The first end of the first switch tube is connected to the charging power supply, the second end of the first switch tube is connected to the first end of the first resistor, the second end of the first resistor is connected to the positive electrode of the battery, and the negative electrode of the battery is grounded. The first end of the second resistor is connected to the positive electrode of the battery, the second end of the second resistor is grounded through a third resistor, and the plurality of load branches are connected in parallel with the third resistor. The control end of the first switch tube and the control end of the second switch tube are both connected to the controller.

2. The energy storage battery testing system according to claim 1, characterized in that: It also includes a charging current detection circuit, which includes a resistor R7, a resistor R8 and an operational amplifier U1A. The non-inverting input terminal of the operational amplifier U1A is connected to the first end of the first resistor, the inverting input terminal of the operational amplifier U1A is connected to the second end of the first resistor, and the output terminal of the operational amplifier U1A is feedback-connected to the inverting input terminal of the operational amplifier U1A through the resistor R8. The output end of the operational amplifier U1A is the output end of the charging current detection circuit.

3. The energy storage battery testing system according to claim 1, characterized in that: It also includes a discharge current detection circuit, which includes a resistor R10, a resistor R9 and an operational amplifier U1B. The non-inverting input terminal of the operational amplifier U1B is connected to the first terminal of the second resistor, the inverting input terminal of the operational amplifier U1B is connected to the second terminal of the second resistor, and the output terminal of the operational amplifier U1B is feedback-connected to the inverting input terminal of the operational amplifier U1B through the resistor R9. The output end of the operational amplifier U1B is the output end of the discharge current detection circuit.

4. The energy storage battery testing system according to claim 1, characterized in that: The battery voltage detection circuit includes a resistor R13, a resistor R14 and an operational amplifier U2A. The non-inverting input terminal of the operational amplifier U2A is connected to the second end of the second resistor, the inverting input terminal of the operational amplifier U2A is grounded through a resistor R13, and the output terminal of the operational amplifier U2A is feedback-connected to the inverting input terminal of the operational amplifier U2A through a resistor R14. The output end of the operational amplifier U2A is the output end of the battery voltage detection circuit.

5. The energy storage battery testing system according to claim 1, characterized in that: It also includes a battery power detection circuit, which includes a first selection switch, a second selection switch and a power monitoring module. The first selection input end of the first selection switch is connected to the first end of the first resistor, the second selection input end of the first selection switch is connected to the second end of the first resistor, and the output end of the first selection switch is connected to the current input positive end of the power monitoring module. The first selection input terminal of the second selection switch is connected to the second terminal of the first resistor, the second selection input terminal of the second selection switch is connected to the second terminal of the second resistor, and the output terminal of the second selection switch is connected to the negative current input terminal of the power monitoring module. The output end of the power monitoring module is connected to the controller.

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