A battery testing system

Abstract

This utility model discloses a battery testing system, including a power supply circuit, a control circuit, a rectifier-inverter module, a DC / DC converter module, and a measurement circuit. The power supply circuit supplies power to the entire system. The AC terminal of the rectifier-inverter module is connected to the AC input terminal for connecting to the power grid. The DC terminal of the rectifier-inverter module is connected to the input terminal of the DC / DC converter module via a first DC bus. The output terminal of the DC / DC converter module is connected to the DC output terminal for connecting the battery under test via a second DC bus. The measurement circuit includes a first voltage measurement circuit and / or a second voltage measurement circuit. The input terminal of the first voltage measurement circuit is connected to the first DC bus, and the output terminal of the first voltage measurement circuit is connected to the first input terminal of the control circuit. The input terminal of the second voltage measurement circuit is connected to the second DC bus, and the output terminal of the second voltage measurement circuit is connected to the second input terminal of the control circuit.

Description

Technical Field

[0001] This utility model belongs to the field of battery testing, and specifically relates to a battery testing system. Background Technology

[0002] Existing battery testing systems dissipate the energy from battery discharge as heat through a load (such as a resistor) during battery testing, resulting in energy waste.

[0003] Furthermore, the measurement circuits (such as voltage and current measurements) of existing battery testing systems have low accuracy. Utility Model Content

[0004] The purpose of this invention is to overcome at least one defect in the prior art and to provide a battery testing system.

[0005] The technical solution of this utility model is implemented as follows: This utility model discloses a battery testing system, including a power supply circuit, a control circuit, a rectifier-inverter module, a DC / DC converter module, and a measurement circuit. The power supply circuit is used to supply power to the entire system. The AC terminal of the rectifier-inverter module is connected to the AC input terminal for connecting to the power grid. The DC terminal of the rectifier-inverter module is connected to the input terminal of the DC / DC converter module via a first DC bus. The output terminal of the DC / DC converter module is connected to the DC output terminal for connecting the battery under test via a second DC bus. The measurement circuit includes a first voltage measurement circuit and / or a second voltage measurement circuit. The input terminal of the first voltage measurement circuit is connected to the first DC bus, and the output terminal of the first voltage measurement circuit is connected to the first input terminal of the control circuit. The input terminal of the second voltage measurement circuit is connected to the second DC bus, and the output terminal of the second voltage measurement circuit is connected to the second input terminal of the control circuit.

[0006] In some embodiments, an EMI filter circuit is provided between the AC terminal and the AC input terminal of the rectifier-inverter module.

[0007] In some embodiments, the control circuit is connected to the rectifier-inverter module and the DC / DC converter module.

[0008] In some embodiments, the control circuit includes a main controller and a drive circuit. The main controller is connected to the rectifier-inverter module via a first drive circuit, and the main controller is connected to the DC / DC converter module via a second drive circuit.

[0009] In some embodiments, the DC / DC conversion module includes a first power transistor, a second power transistor, a third power transistor, a fourth power transistor, and an inductor L1. The first terminal of the first power transistor is connected to the positive terminal of the first DC bus. The second terminal of the first power transistor is connected to the first terminal of the second power transistor and one end of the inductor L1. The second terminal of the second power transistor is connected to the negative terminal of the first DC bus. The first terminal of the third power transistor is connected to the positive terminal of the second DC bus. The second terminal of the third power transistor is connected to the first terminal of the fourth power transistor and the other end of the inductor L1. The second terminal of the fourth power transistor is connected to the negative terminal of the second DC bus. The control terminals of the first, second, third, and fourth power transistors are connected to a control circuit.

[0010] In some embodiments, the input terminal of the DC / DC converter module is provided with a first transient suppression diode, the anode of the first transient suppression diode is connected to the cathode of the first DC bus, and the cathode of the first transient suppression diode is connected to the anode of the first DC bus.

[0011] And / or,

[0012] The output terminal of the DC / DC converter module is provided with a second transient suppression diode. The positive terminal of the second transient suppression diode is connected to the negative terminal of the second DC bus, and the cathode of the second transient suppression diode is connected to the positive terminal of the second DC bus.

[0013] And / or,

[0014] The input terminal of the DC / DC converter module is provided with an input filter circuit, which includes at least one input filter capacitor. One end of the input filter capacitor is connected to the positive terminal of the first DC bus, and the other end of the input filter capacitor is connected to the negative terminal of the first DC bus.

[0015] And / or,

[0016] The output terminal of the DC / DC converter module is provided with an output filter circuit, which includes at least one output filter capacitor. One end of the output filter capacitor is connected to the positive terminal of the second DC bus, and the other end of the output filter capacitor is connected to the negative terminal of the second DC bus.

[0017] In some embodiments, both the first voltage measurement circuit and the second voltage measurement circuit include a signal conditioning circuit. The signal conditioning circuit includes an input circuit, a first amplification circuit, a voltage comparison and shaping circuit, a second amplification circuit, and an output circuit. The input terminal of the input circuit is used to receive a voltage signal. The output terminal of the input circuit is connected to the input terminal of the first amplification circuit. The output terminal of the first amplification circuit is connected to the input terminal of the voltage comparison and shaping circuit. The output terminal of the voltage comparison and shaping circuit is connected to the input terminal of the second amplification circuit. The output terminal of the second amplification circuit is connected to the input terminal of the output circuit. The output terminal of the output circuit is connected to the first or second input terminal of the control circuit.

[0018] In some embodiments, the first amplifier circuit includes a first operational amplifier, the non-inverting input terminal of the first operational amplifier is grounded, and the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier via a fixed resistor or a variable resistor.

[0019] And / or,

[0020] The voltage comparison and shaping circuit includes a second operational amplifier. The non-inverting input terminal of the second operational amplifier is grounded. The inverting input terminal of the second operational amplifier is connected to one end of a third resistor and the cathode of a first diode. The other end of the third resistor is the input terminal of the voltage comparison and shaping circuit. The anode of the first diode is connected to the output terminal of the second operational amplifier. The output terminal of the second operational amplifier is connected to the cathode of the second diode. The anode of the second diode is connected to one end of a fourth resistor. The other end of the fourth resistor is connected to the inverting input terminal of the second operational amplifier. The anode of the second diode is the output terminal of the voltage comparison and shaping circuit.

[0021] And / or,

[0022] The second amplifier circuit includes a third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, and the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier via a seventh resistor.

[0023] In some embodiments, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier via a first capacitor;

[0024] And / or,

[0025] The output of the first operational amplifier is grounded via the second capacitor;

[0026] And / or,

[0027] A third capacitor is connected in series between the output of the first operational amplifier and the input of the voltage comparator and shaping circuit.

[0028] And / or,

[0029] The inverting input of the third operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the input of the voltage comparator and the shaping circuit.

[0030] And / or,

[0031] The inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier via the fourth capacitor;

[0032] And / or,

[0033] The inverting input of the third operational amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the output of the voltage comparator and shaping circuit.

[0034] In some embodiments, the voltage sampling input includes a voltage divider network, which includes a first resistor and a second resistor. One end of the first resistor is connected to an interface and one end of the second resistor, respectively. The other end of the first resistor is grounded, and the other end of the second resistor is connected to the input terminal of a first amplifier circuit.

[0035] And / or,

[0036] The output circuit includes a fourth operational amplifier, the non-inverting input terminal of which is connected to the output terminal of the second amplifier circuit, and the inverting input terminal of which is connected to the output terminal of the fourth operational amplifier.

[0037] The fourth operational amplifier is connected directly or via at least one resistor to the first or second input terminal of the control circuit.

[0038] And / or,

[0039] The signal conditioning circuit also includes a fifth capacitor, one end of which is connected to the output of the signal conditioning circuit, and the other end of which is grounded.

[0040] In some embodiments, the measurement circuit further includes a first current measurement circuit and / or a second current measurement circuit. The first current measurement circuit includes a first signal conditioning circuit and a first sampling resistor connected in series on the first DC bus. The two ends of the first sampling resistor are respectively connected to the two input terminals of the first signal conditioning circuit, and the output terminal of the first signal conditioning circuit is connected to the third input terminal of the control circuit. The second current measurement circuit includes a second signal conditioning circuit and a second sampling resistor connected in series on the second DC bus. The two ends of the second sampling resistor are respectively connected to the two input terminals of the second signal conditioning circuit, and the output terminal of the second signal conditioning circuit is connected to the fourth input terminal of the control circuit.

[0041] In some embodiments, the measurement circuit further includes a temperature measurement circuit for acquiring battery temperature, the output of which is connected to the fifth input of the control circuit.

[0042] This utility model has at least the following beneficial effects:

[0043] This utility model's battery testing system achieves precise voltage matching (buck charging, boost discharging) between the battery pack and the first DC bus through a DC / DC converter module, reducing energy loss caused by voltage mismatch and significantly improving charging and discharging efficiency. The rectifier-inverter module can efficiently complete AC-DC conversion, adapting to the AC characteristics of the power grid and ensuring minimal energy conversion loss between the power grid and the DC bus.

[0044] The battery testing system of this invention can feed the energy generated during battery discharge back to the power grid, improve energy utilization efficiency, reduce energy waste, and reduce energy consumption during the testing process. The feedback efficiency can reach more than 85%.

[0045] The measurement circuit of this invention can monitor the key states of the battery pack, such as voltage, current, and temperature, in real time. The data is fed back to the control circuit, which intelligently adjusts the charging and discharging logic of the bidirectional reversible power module based on the monitoring data, strictly avoiding overcharging and over-discharging, and fundamentally extending the cycle life and service life of the battery pack.

[0046] The battery testing system of this invention has high-precision testing capabilities, which can accurately test various performance parameters of the battery and ensure the accuracy and reliability of the test results. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic block diagram of a battery testing system provided in one embodiment of the present invention;

[0049] Figure 2 A schematic block diagram of a battery testing system provided in another embodiment of this utility model;

[0050] Figure 3 A circuit diagram of a DC / DC converter module provided in one embodiment of this utility model;

[0051] Figure 4 A circuit diagram of a signal conditioning circuit provided in one embodiment of this utility model;

[0052] Figure 5 A circuit diagram of a power supply circuit provided in one embodiment of this utility model;

[0053] Figure 6 A circuit diagram of a main controller provided in one embodiment of the present invention;

[0054] Figure 7 This is a schematic block diagram of a measurement circuit provided in one embodiment of the present invention. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" or "several" means two or more.

[0057] See Figure 1 and Figure 2 This utility model provides a battery testing system, including a power supply circuit, a control circuit, a rectifier-inverter module, a DC / DC converter module, and a measurement circuit. The power supply circuit supplies power to the entire system. The AC terminal of the rectifier-inverter module is connected to an AC input terminal for connecting to the power grid. The DC terminal of the rectifier-inverter module is connected to the input terminal of the DC / DC converter module via a first DC bus. The output terminal of the DC / DC converter module is connected to a DC output terminal for connecting to the battery under test via a second DC bus. The measurement circuit includes a first voltage measurement circuit and / or a second voltage measurement circuit. The input terminal of the first voltage measurement circuit is connected to the first DC bus, and the output terminal of the first voltage measurement circuit is connected to the first input terminal of the control circuit. The input terminal of the second voltage measurement circuit is connected to the second DC bus, and the output terminal of the second voltage measurement circuit is connected to the second input terminal of the control circuit.

[0058] The rectifier-inverter module of this invention can be an existing rectifier-inverter module, which will not be described in detail here.

[0059] The bidirectional reversible power module includes a rectifier-inverter module and a DC / DC converter module, responsible for the core energy form conversion. The operation of this module is entirely controlled by the PWM (Pulse Width Modulation) signal issued by the main controller, and its internal process can be divided into two modes according to the energy flow direction:

[0060] Mode 1: Charging Mode (AC -> DC) - The power grid charges the battery.

[0061] Mode 2: Discharge / Feedback Mode (DC -> AC) - The battery feeds energy back to the grid.

[0062] Bidirectionality: Seamless switching between the two modes is achieved through different control algorithms and PWM driving methods.

[0063] The bidirectional reversible power module uses SiC / GaN devices, allowing switching frequencies up to hundreds of kHz, which significantly reduces the size and weight of passive components such as transformers, inductors, and capacitors.

[0064] The entire energy conversion process is completely controlled by the PWM signal of the main controller, which enables precise execution of complex charge and discharge curves.

[0065] By employing rectifier-inverter modules and DC / DC converter modules, high-precision, high-power-quality DC output is achieved. This design ensures the power quality on the grid side during energy feedback, reducing interference to the grid.

[0066] In some embodiments, an EMI filter circuit is provided between the AC terminal and the AC input terminal of the rectifier-inverter module.

[0067] In some embodiments, the control circuit is connected to the rectifier-inverter module and the DC / DC converter module.

[0068] In some embodiments, the control circuit includes a main controller and a drive circuit. The main controller is connected to the rectifier-inverter module via a first drive circuit, and the main controller is connected to the DC / DC converter module via a second drive circuit. Both the first and second drive circuits can be existing drive circuits, and will not be described in detail here.

[0069] The main controller may include MCU, microcontroller, DSP, or FPGA, etc. Figure 6 One embodiment of a microcontroller has been disclosed; however, this invention is not limited to this one. Figure 6 Examples of implementations.

[0070] The main controller acquires signals from the measurement circuit, compares the data collected by the ADC (such as the actual current value) with the set value (target current value), and calculates how to adjust the PWM output to reduce errors using control algorithms such as PID. The main controller then converts the calculation results into specific PWM pulse widths and timing sequences, directly driving the power switching transistors of the bidirectional reversible power module.

[0071] In some embodiments, see Figure 3The DC / DC converter module includes a first power transistor, a second power transistor, a third power transistor, a fourth power transistor, and an inductor L1. The first terminal of the first power transistor is connected to the positive terminal of the first DC bus. The second terminal of the first power transistor is connected to the first terminal of the second power transistor and one end of the inductor L1. The second terminal of the second power transistor is connected to the negative terminal of the first DC bus. The first terminal of the third power transistor is connected to the positive terminal of the second DC bus. The second terminal of the third power transistor is connected to the first terminal of the fourth power transistor and the other end of the inductor L1. The second terminal of the fourth power transistor is connected to the negative terminal of the second DC bus. The control terminals of the first, second, third, and fourth power transistors are connected to a control circuit.

[0072] The negative terminal of the first DC bus is grounded.

[0073] In some embodiments, see Figure 3 The input terminal of the DC / DC converter module is provided with a first transient suppression diode T1. The positive terminal of the first transient suppression diode T1 is connected to the negative terminal of the first DC bus, and the cathode of the first transient suppression diode T1 is connected to the positive terminal of the first DC bus.

[0074] In some embodiments, see Figure 3 The output terminal of the DC / DC converter module is provided with a second transient suppression diode T2. The positive terminal of the second transient suppression diode T2 is connected to the negative terminal of the second DC bus, and the cathode of the second transient suppression diode T2 is connected to the positive terminal of the second DC bus.

[0075] In some embodiments, see Figure 3 The input terminal of the DC / DC converter module is provided with an input filter circuit, which includes at least one input filter capacitor. One end of the input filter capacitor is connected to the positive terminal of the first DC bus, and the other end of the input filter capacitor is connected to the negative terminal of the first DC bus.

[0076] In some embodiments, see Figure 3 The output terminal of the DC / DC converter module is provided with an output filter circuit, which includes at least one output filter capacitor. One end of the output filter capacitor is connected to the positive terminal of the second DC bus, and the other end of the output filter capacitor is connected to the negative terminal of the second DC bus.

[0077] In some embodiments, both the first voltage measurement circuit and the second voltage measurement circuit include a signal conditioning circuit, see [link]. Figure 4The signal conditioning circuit includes an input circuit, a first amplification circuit, a voltage comparison and shaping circuit, a second amplification circuit, and an output circuit. The input terminal of the input circuit is used to receive voltage signals. The output terminal of the input circuit is connected to the input terminal of the first amplification circuit. The output terminal of the first amplification circuit is connected to the input terminal of the voltage comparison and shaping circuit. The output terminal of the voltage comparison and shaping circuit is connected to the input terminal of the second amplification circuit. The output terminal of the second amplification circuit is connected to the input terminal of the output circuit. The output terminal of the output circuit is connected to the first or second input terminal of the control circuit.

[0078] In some embodiments, the first amplification circuit includes a first operational amplifier U700A, with its non-inverting input terminal grounded and its inverting input terminal connected to its output terminal via a fixed resistor or a variable resistor. The variable resistor can be, but is not limited to, a potentiometer RW3. This invention allows for gain adjustment via potentiometer RW3, amplifying weak voltage signals to a suitable amplitude.

[0079] In some embodiments, the voltage comparison and shaping circuit includes a second operational amplifier U700B. The non-inverting input terminal of the second operational amplifier U700B is grounded, and the inverting input terminal of the second operational amplifier U700B is connected to one end of a third resistor R702 and the cathode of a first diode D701. The other end of the third resistor R702 is the input terminal of the voltage comparison and shaping circuit. The anode of the first diode D701 is connected to the output terminal of the second operational amplifier U700B, and the output terminal of the second operational amplifier U700B is connected to the cathode of the second diode D702. The anode of the second diode D702 is connected to one end of a fourth resistor R703, and the other end of the fourth resistor R703 is connected to the inverting input terminal of the second operational amplifier U700B. The anode of the second diode D702 is the output terminal of the voltage comparison and shaping circuit.

[0080] The operational amplifier U700B acts as a voltage comparator, working with diodes D701 and D702 to shape continuous voltage signals into high and low levels (similar to digital signals), making it easier for subsequent circuits to identify the voltage threshold.

[0081] In some embodiments, the second amplification circuit includes a third operational amplifier U700C. The non-inverting input terminal of the third operational amplifier U700C is grounded, and the inverting input terminal of the third operational amplifier U700C is connected to the output terminal of the third operational amplifier U700C via a seventh resistor R706. The third operational amplifier U700C performs secondary signal amplification, further increasing the signal amplitude and ensuring the driving capability of the output signal.

[0082] In some embodiments, the inverting input terminal of the first operational amplifier U700A is connected to the output terminal of the first operational amplifier U700A via the first capacitor C701.

[0083] In some embodiments, the output terminal of the first operational amplifier U700A is grounded via the second capacitor C702.

[0084] In some embodiments, a third capacitor C703 is connected in series between the output terminal of the first operational amplifier U700A and the input terminal of the voltage comparison and shaping circuit.

[0085] In some embodiments, the inverting input of the third operational amplifier U700C is connected to one end of the fifth resistor R704, and the other end of the fifth resistor R704 is connected to the input of the voltage comparator and shaping circuit.

[0086] In some embodiments, the inverting input terminal of the third operational amplifier U700C is connected to the output terminal of the third operational amplifier U700C via the fourth capacitor C704.

[0087] In some embodiments, the inverting input terminal of the third operational amplifier U700C is connected to one end of the sixth resistor R705, and the other end of the sixth resistor R705 is connected to the output terminal of the voltage comparator and shaping circuit.

[0088] In some embodiments, the voltage sampling input includes a voltage divider network, which includes a first resistor R700 and a second resistor R701. One end of the first resistor R700 is connected to the interface and one end of the second resistor R701, respectively. The other end of the first resistor R700 is grounded, and the other end of the second resistor R701 is connected to the input terminal of the first amplifier circuit. The interface JP700 is used to receive external voltage signals (such as sensor output, power supply voltage feedback, etc.). Resistors R700 and R701 form a voltage divider network to perform preliminary conditioning of the input voltage and prevent overvoltage damage to the operational amplifier.

[0089] In some embodiments, the output circuit includes a fourth operational amplifier U700D, the non-inverting input of which is connected to the output of the second amplifier circuit, and the inverting input of which is connected to its output. The operational amplifier U700D is used for level conversion, converting the signal voltage from the preceding stage to a level compatible with the subsequent system (such as an MCU or microcontroller), such as +3.3V.

[0090] The fourth operational amplifier U700D is connected directly or via at least one resistor to the first or second input terminal of the control circuit.

[0091] In some embodiments, the signal conditioning circuit further includes a fifth capacitor C705, one end of which is connected to the output terminal of the signal conditioning circuit, and the other end of which is grounded.

[0092] In other embodiments, the fourth operational amplifier U700D is connected to the first or second input terminal of the control circuit via the eighth resistor R707 and the ninth resistor R708. The signal conditioning circuit includes a fifth capacitor C705 and a sixth capacitor C706. One end of the fifth capacitor C705 is connected between the eighth resistor R707 and the ninth resistor R708, and the other end of the fifth capacitor C705 is grounded. One end of the sixth capacitor C706 is connected to the output terminal of the signal conditioning circuit, and the other end of the sixth capacitor C706 is grounded. Capacitors C705 and C706 are output filter capacitors used to stabilize the output voltage and reduce ripple. Resistors R707 and R708 form a voltage divider circuit to further adjust the accuracy of the output level.

[0093] The measurement circuit of this invention is not limited to the first voltage measurement circuit and the second voltage measurement circuit; other voltage measurement circuits can also be set up as needed to collect the voltage of other nodes.

[0094] In some embodiments, the measurement circuit further includes a first current measurement circuit and / or a second current measurement circuit. The first current measurement circuit includes a first signal conditioning circuit and a first sampling resistor R5 connected in series on the first DC bus. The two ends of the first sampling resistor R5 are respectively connected to the two input terminals of the first signal conditioning circuit, and the output terminal of the first signal conditioning circuit is connected to the third input terminal of the control circuit. The second current measurement circuit includes a second signal conditioning circuit and a second sampling resistor R14 connected in series on the second DC bus. The two ends of the second sampling resistor R14 are respectively connected to the two input terminals of the second signal conditioning circuit, and the output terminal of the second signal conditioning circuit is connected to the fourth input terminal of the control circuit. The first signal conditioning circuit and the second signal conditioning circuit of this utility model can adopt the signal conditioning circuit of the above embodiments, but are not limited to the above signal conditioning circuit, and can also adopt existing signal conditioning circuits.

[0095] The measurement circuit of this invention is not limited to the first current measurement circuit and the second current measurement circuit; other current measurement circuits can also be set up as needed to collect the current at other nodes.

[0096] In some embodiments, the power supply circuit of this invention is used to provide +24V, +12V, -12V, +5V, +3.3V, etc. to the battery testing system. See the specific circuit diagram below. Figure 5 As shown, and of course, not limited to Figure 5 The circuit shown.

[0097] In some embodiments, the measurement circuit further includes a temperature measurement circuit for acquiring battery temperature, the output of which is connected to the fifth input of the control circuit.

[0098] See Figure 7In some embodiments, the outputs of the temperature measurement circuit, voltage measurement circuit, and current measurement circuit of this invention can be connected to the main controller via a multiplexer. The multiplexer sequentially switches signals from multiple channels onto a single ADC path, achieving time-division multiplexing.

[0099] In some embodiments, the battery testing system of this utility model further includes a communication circuit, and the control circuit is connected to a host computer via the communication circuit.

[0100] This utility model's battery testing system simulates the charging and discharging behavior of batteries under various operating conditions to verify their performance, lifespan, safety, and reliability. It is an indispensable piece of equipment in battery research and development, quality verification, and production. This battery testing system achieves high power and bidirectional feedback functions while minimizing equipment size (high power density). High power typically refers to a single unit power output of tens to hundreds of kW, or even MW-level (megawatt-level) power output through parallel connection. This meets the testing needs of large battery packs, battery modules, and even energy storage systems.

[0101] The battery testing system of this invention no longer dissipates the energy of battery discharge as heat through a resistive load. Instead, it uses a rectifier-inverter module and a DC / DC converter module to invert DC power into AC power that is in phase and frequency with the power grid, feeding it back to the local power grid for use by other devices.

[0102] This utility model's battery testing system effectively tests battery life and performance through its efficient energy feedback technology, precise testing capabilities, compact size design, and intelligent data analysis system, thereby improving energy utilization efficiency.

[0103] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery testing system, characterized by: The system includes a power supply circuit, a control circuit, a rectifier-inverter module, a DC / DC converter module, and a measurement circuit. The power supply circuit supplies power to the entire system. The AC terminal of the rectifier-inverter module is connected to the AC input terminal for connecting to the power grid. The DC terminal of the rectifier-inverter module is connected to the input terminal of the DC / DC converter module via a first DC bus. The output terminal of the DC / DC converter module is connected to the DC output terminal for connecting to the battery under test via a second DC bus. The measurement circuit includes a first voltage measurement circuit and / or a second voltage measurement circuit. The input terminal of the first voltage measurement circuit is connected to the first DC bus, and the output terminal of the first voltage measurement circuit is connected to the first input terminal of the control circuit. The input terminal of the second voltage measurement circuit is connected to the second DC bus, and the output terminal of the second voltage measurement circuit is connected to the second input terminal of the control circuit.

2. The battery testing system as described in claim 1, characterized in that: The control circuit is connected to the rectifier-inverter module and the DC / DC converter module.

3. The battery testing system as described in claim 1, characterized in that: The DC / DC converter module includes a first power transistor, a second power transistor, a third power transistor, a fourth power transistor, and an inductor. The first terminal of the first power transistor is connected to the positive terminal of the first DC bus. The second terminal of the first power transistor is connected to the first terminal of the second power transistor and one end of the inductor. The second terminal of the second power transistor is connected to the negative terminal of the first DC bus. The first terminal of the third power transistor is connected to the positive terminal of the second DC bus. The second terminal of the third power transistor is connected to the first terminal of the fourth power transistor and the other end of the inductor. The second terminal of the fourth power transistor is connected to the negative terminal of the second DC bus. The control terminals of the first, second, third, and fourth power transistors are connected to a control circuit.

4. The battery testing system as described in claim 1 or 3, characterized in that: The input terminal of the DC / DC converter module is provided with a first transient suppression diode. The positive terminal of the first transient suppression diode is connected to the negative terminal of the first DC bus, and the cathode of the first transient suppression diode is connected to the positive terminal of the first DC bus. And / or, The output terminal of the DC / DC converter module is provided with a second transient suppression diode. The positive terminal of the second transient suppression diode is connected to the negative terminal of the second DC bus, and the cathode of the second transient suppression diode is connected to the positive terminal of the second DC bus. And / or, The input terminal of the DC / DC converter module is provided with an input filter circuit, which includes at least one input filter capacitor. One end of the input filter capacitor is connected to the positive terminal of the first DC bus, and the other end of the input filter capacitor is connected to the negative terminal of the first DC bus. And / or, The output terminal of the DC / DC converter module is provided with an output filter circuit, which includes at least one output filter capacitor. One end of the output filter capacitor is connected to the positive terminal of the second DC bus, and the other end of the output filter capacitor is connected to the negative terminal of the second DC bus.

5. The battery testing system as described in claim 1, characterized in that: Both the first voltage measurement circuit and the second voltage measurement circuit include a signal conditioning circuit. The signal conditioning circuit includes an input circuit, a first amplification circuit, a voltage comparison and shaping circuit, a second amplification circuit, and an output circuit. The input terminal of the input circuit is used to receive voltage signals. The output terminal of the input circuit is connected to the input terminal of the first amplification circuit. The output terminal of the first amplification circuit is connected to the input terminal of the voltage comparison and shaping circuit. The output terminal of the voltage comparison and shaping circuit is connected to the input terminal of the second amplification circuit. The output terminal of the second amplification circuit is connected to the input terminal of the output circuit. The output terminal of the output circuit is connected to the first or second input terminal of the control circuit.

6. The battery testing system as described in claim 5, characterized in that: The first amplifier circuit includes a first operational amplifier, the non-inverting input terminal of the first operational amplifier is grounded, and the inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier via a fixed resistor or a variable resistor; And / or, The voltage comparison and shaping circuit includes a second operational amplifier. The non-inverting input terminal of the second operational amplifier is grounded. The inverting input terminal of the second operational amplifier is connected to one end of a third resistor and the cathode of a first diode. The other end of the third resistor is the input terminal of the voltage comparison and shaping circuit. The anode of the first diode is connected to the output terminal of the second operational amplifier. The output terminal of the second operational amplifier is connected to the cathode of the second diode. The anode of the second diode is connected to one end of a fourth resistor. The other end of the fourth resistor is connected to the inverting input terminal of the second operational amplifier. The anode of the second diode is the output terminal of the voltage comparison and shaping circuit. And / or, The second amplifier circuit includes a third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, and the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier via a seventh resistor.

7. The battery testing system as described in claim 6, characterized in that: The inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier via the first capacitor; And / or, The output of the first operational amplifier is grounded via the second capacitor; And / or, A third capacitor is connected in series between the output of the first operational amplifier and the input of the voltage comparator and shaping circuit. And / or, The inverting input of the third operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the input of the voltage comparator and the shaping circuit. And / or, The inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier via the fourth capacitor; And / or, The inverting input of the third operational amplifier is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the output of the voltage comparator and shaping circuit.

8. The battery testing system as described in claim 5, 6, or 7, characterized in that: The voltage sampling input includes a voltage divider network, which includes a first resistor and a second resistor. One end of the first resistor is connected to the interface and one end of the second resistor, respectively. The other end of the first resistor is grounded, and the other end of the second resistor is connected to the input terminal of the first amplifier circuit. And / or, The output circuit includes a fourth operational amplifier, the non-inverting input terminal of which is connected to the output terminal of the second amplifier circuit, and the inverting input terminal of which is connected to the output terminal of the fourth operational amplifier. The fourth operational amplifier is connected directly or via at least one resistor to the first or second input terminal of the control circuit. And / or, The signal conditioning circuit also includes a fifth capacitor, one end of which is connected to the output of the signal conditioning circuit, and the other end of which is grounded.

9. The battery testing system as described in claim 1, characterized in that: The measurement circuit further includes a first current measurement circuit and / or a second current measurement circuit. The first current measurement circuit includes a first signal conditioning circuit and a first sampling resistor connected in series on the first DC bus. The two ends of the first sampling resistor are respectively connected to the two input terminals of the first signal conditioning circuit, and the output terminal of the first signal conditioning circuit is connected to the third input terminal of the control circuit. The second current measurement circuit includes a second signal conditioning circuit and a second sampling resistor connected in series on the second DC bus. The two ends of the second sampling resistor are respectively connected to the two input terminals of the second signal conditioning circuit, and the output terminal of the second signal conditioning circuit is connected to the fourth input terminal of the control circuit.

10. The battery testing system as described in claim 1, characterized in that: The measurement circuit also includes a temperature measurement circuit for acquiring battery temperature, the output of which is connected to the fifth input of the control circuit.

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