Battery internal resistance suppression system and energy storage battery cabinet

Abstract

The application relates to a battery internal resistance inhibition system and an energy storage battery cabinet. In the system, a current compensation circuit is connected to a battery pack to be measured; an isolation driving module is connected to the current compensation circuit; a power conversion module is connected to the isolation driving module and the battery pack to be measured; a control device is connected to the power conversion module and the battery pack to be measured; the control device is configured to detect the impedance of the battery pack to be measured, and transmit a target control signal to the power conversion module according to the detection result; the power conversion module is used for transmitting a target driving signal to the isolation driving module according to the target control signal, so that the isolation driving module drives the current compensation circuit to compensate the current of the battery pack to be measured, the internal resistance polarization component of the battery pack to be measured is automatically and quickly inhibited, manual adjustment of the battery internal resistance is not needed, the accuracy and reliability of the internal resistance adjustment are improved, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery internal resistance suppression system and an energy storage battery cabinet. BACKGROUND

[0002] With the rapid development of energy storage technology, outdoor energy storage cabinets are increasingly widely used. With the increase of use time, the number of cycles of battery charging and discharging of the outdoor energy storage cabinet increases. In a low SOC state, the internal resistance of the battery in the outdoor energy storage cabinet increases. The battery internal resistance directly affects the output capacity, energy efficiency and service life of the outdoor energy storage cabinet.

[0003] In the control system of the existing outdoor energy storage cabinet, only the internal resistance of the battery can be monitored, and the internal resistance needs to be adjusted by a human way, which leads to a large internal resistance adjustment error and affects the service life of the outdoor energy storage cabinet. CONTENT OF THE UTILITY MODEL

[0004] Therefore, a battery internal resistance suppression system and an energy storage battery cabinet are provided.

[0005] In a first aspect, the application provides a battery internal resistance suppression system, comprising: A current compensation circuit, which is used to connect a battery pack to be tested; An isolation driving module, which is connected to the current compensation circuit; A power conversion module, which is connected to the isolation driving module and the battery pack to be tested; A control device, which is connected to the power conversion module and the battery pack to be tested; The control device is configured to detect the impedance of the battery pack to be tested, and transmit a target control signal to the power conversion module according to the result of the impedance detection. The power conversion module is used to transmit a target driving signal to the isolation driving module according to the target control signal, so that the isolation driving module drives the current compensation circuit to perform current compensation on the battery pack to be tested.

[0006] In one embodiment, the control device comprises a control module and an impedance detection module; The control module is connected to the impedance detection module and the power conversion module, and the impedance detection module is connected to the battery pack to be tested; The control module is configured to control the impedance detection module to transmit a detection current signal to the battery pack to be tested to detect the impedance of the battery pack to be tested.

[0007] In one embodiment, the impedance detection module comprises an excitation source circuit and a signal acquisition circuit; the control module is connected to the excitation source circuit and the signal acquisition circuit, and the excitation source circuit and the signal acquisition circuit are connected to the battery pack to be tested; The control module is configured to control the excitation source circuit to transmit a detection current signal to the battery pack to be tested, so that the signal acquisition circuit acquires an electrical signal of the battery pack to be tested to obtain an acquisition signal. The control module is further configured to transmit a target control signal to the power conversion module according to the acquisition signal.

[0008] In one of the embodiments, the excitation source circuit comprises a waveform generator, an operational amplifier and a voltage-controlled current source. The input end of the waveform generator is connected to the control module, the output end of the waveform generator is connected to the input end of the operational amplifier, the output end of the operational amplifier is connected to the voltage-controlled current source, and the voltage-controlled current source is connected to the battery pack to be tested.

[0009] In one of the embodiments, the control module comprises a processor and a lock-in amplifier. The input end of the lock-in amplifier is connected to the signal acquisition circuit, and the output end of the lock-in amplifier is connected to the processor.

[0010] In one of the embodiments, the signal acquisition circuit comprises a current acquisition module and a voltage acquisition module. The current acquisition module is connected to the battery pack to be tested and the control module respectively, and the voltage acquisition module is connected to the battery pack to be tested and the control module respectively.

[0011] In one of the embodiments, the current compensation circuit comprises a switch tube module and a transformer. The switch tube module is connected to the isolation driving module, the switch tube module is connected to the transformer, and the transformer is connected to the battery pack to be tested.

[0012] In one of the embodiments, the battery internal resistance suppression system further comprises an auxiliary power supply. The input end of the auxiliary power supply is connected to the battery pack to be tested, and the output end of the auxiliary power supply is connected to the control device, the current compensation circuit, the power conversion module and the isolation driving module respectively.

[0013] In one of the embodiments, the power conversion module comprises a bidirectional DCDC module. The first end of the bidirectional DCDC module is connected to the auxiliary power supply, the second end of the bidirectional DCDC module is connected to the isolation driving module, and the control end of the bidirectional DCDC module is connected to the control device.

[0014] In a second aspect, the application further provides a battery storage cabinet, comprising a cabinet body, a battery pack to be tested and a battery internal resistance suppression system according to any one of the above. The battery pack to be tested and the battery internal resistance suppression system are arranged in the cabinet body, and the battery internal resistance suppression system is connected to the battery pack to be tested.

[0015] One of the above technical solutions has the following advantages and beneficial effects: The battery internal resistance suppression system comprises a current compensation circuit, an isolation driving module, a power conversion module and a control device. The current compensation circuit is used for connecting a battery pack to be measured. The isolation driving module is connected to the current compensation circuit. The power conversion module is connected to the isolation driving module and the battery pack to be measured respectively. The control device is connected to the power conversion module and the battery pack to be measured respectively. The control device is configured to perform impedance detection on the battery pack to be measured, and transmit a target control signal to the power conversion module according to the result of the impedance detection. The power conversion module is used for transmitting a target driving signal to the isolation driving module according to the target control signal, so that the isolation driving module drives the current compensation circuit to perform current compensation on the battery pack to be measured, thereby realizing automatic suppression of the internal resistance of the battery pack to be measured. According to the result of the impedance detection on the battery pack to be measured by the control device, the target control signal is transmitted to the power conversion module. The target driving signal corresponding to the target control signal is transmitted to the isolation driving module through the power conversion module. The current compensation circuit is driven to work through the isolation driving module, and then the current compensation circuit injects corresponding compensation current into the battery pack to be measured, thereby realizing automatic and rapid suppression of the internal resistance polarization component of the battery pack to be measured. The battery internal resistance does not need to be adjusted artificially, the accuracy and reliability of the internal resistance adjustment are improved, and the service life of the battery is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a first structural schematic diagram of a battery internal resistance suppression system in an embodiment of the present application; Figure 2 FIG. 2 is a second structural schematic diagram of a battery internal resistance suppression system in an embodiment of the present application; Figure 3 FIG. 3 is a third structural schematic diagram of a battery internal resistance suppression system in an embodiment of the present application; Figure 4 FIG. 4 is a fourth structural schematic diagram of a battery internal resistance suppression system in an embodiment of the present application; Figure 5 FIG. 5 is a fifth structural schematic diagram of a battery internal resistance suppression system in an embodiment of the present application.

[0017] REFERENCE NUMERALS: 10, current compensation circuit; 110, switch tube module; 120, transformer; 20, isolation driving module; 30, power conversion module; 310, bidirectional DCDC module; 40, control device; 410, control module; 412, processor; 414, phase-locked amplifier; 420, impedance detection module; 422, excitation source circuit; 4222, waveform generator; 4224, operational amplifier; 4226, voltage-controlled current source; 424, signal acquisition circuit; 4242, current acquisition module; 4244, voltage acquisition module; 50, battery pack to be measured; 60, auxiliary power supply. DETAILED DESCRIPTION

[0018] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0019] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In addition, the term "a plurality of" should mean two and more than two.

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] In one embodiment, as shown in Figure 1 In one embodiment, as shown in

[0023] The battery pack 50 to be measured can include a plurality of single battery cells, each of which can be composed by series connection and / or parallel connection, and the single battery cells can be lithium ion battery cells, but are not limited thereto. The battery pack 50 to be measured can be applied to an energy storage battery cabinet, which can be an outdoor energy storage battery cabinet. In another example, the battery pack 50 to be measured can also be applied to an electric vehicle.

[0024] The power conversion module 30 is configured to convert an input power signal into a target driving signal, which can be a pulse signal. The isolation driving module 20 is configured to electrically isolate a high voltage signal on the side of the battery pack 50 to be measured from a low voltage signal on the side of the control device 40, so as to avoid signal interference. The isolation driving module 20 is also configured to drive the current compensation circuit 10 to work according to the target driving signal. The current compensation circuit 10 injects a corresponding compensation current into the battery pack 50 to be measured according to the driving of the isolation driving module 20, so as to automatically and quickly suppress the polarization component in the internal resistance of the battery pack 50 to be measured.

[0025] The control device 40 can be configured to detect the impedance of the battery pack 50 to be measured. For example, the control device 40 is provided with a corresponding acquisition module, and the acquisition module collects the electrical signal of the battery pack 50 to be measured, and processes the electrical signal based on a preloaded existing program, so as to obtain the internal resistance of the battery pack 50 to be measured. For another example, the control device 40 is also provided with an analog circuit, and the acquisition module collects the electrical signal and inputs the electrical signal into the analog circuit for processing. The internal resistance of the battery pack 50 to be measured is obtained by detecting the output of the analog circuit. The control module 410 can also be configured to transmit a target control signal to the power conversion module 30 according to the detected internal resistance, so as to control the power conversion module 30 to start working.

[0026] Based on that the control device 40 is connected to the battery pack 50 to be measured, the control device 40 can detect the impedance of the battery pack 50 to be measured. Based on that the battery pack 50 to be measured is connected to the power conversion module 30, the battery pack 50 to be measured supplies power to the power conversion module 30. Based on that the control device 40 is connected to the power conversion module 30, the power conversion module 30 is connected to the isolation driving module 20, the isolation driving module 20 is connected to the current compensation circuit 10, and the current compensation circuit 10 is connected to the battery pack 50 to be measured. The control device 40 transmits a target control signal to the power conversion module 30 according to the impedance detection result of the battery pack 50 to be measured. The power conversion module 30 transmits a target driving signal to the isolation driving module 20 according to the target control signal, so that the isolation driving module 20 drives the current compensation circuit 10 to perform current compensation on the battery pack 50 to be measured, thereby automatically suppressing the internal resistance of the battery pack 50 to be measured.

[0027] In the above embodiment, according to the impedance detection result of the battery pack 50 to be detected by the control device 40, a target control signal is transmitted to the power conversion module 30; a target driving signal corresponding to the target control signal is transmitted to the isolation driving module 20 by the power conversion module 30; the current compensation circuit 10 is driven to work by the isolation driving module 20, and then the current compensation circuit 10 injects a corresponding compensation current into the battery pack 50 to be detected, so as to automatically and quickly suppress the internal resistance polarization component of the battery pack 50 to be detected, without the need for manual adjustment of the battery internal resistance, thereby improving the accuracy and reliability of the internal resistance adjustment and prolonging the service life of the battery.

[0028] In one embodiment, as shown in Figure 2 The control device 40 includes a control module 410 and an impedance detection module 420; the control module 410 is connected to the impedance detection module 420 and the power conversion module 30, respectively, and the impedance detection module 420 is connected to the battery pack 50 to be detected; the control module 410 is configured to control the impedance detection module 420 to transmit a detection current signal to the battery pack 50 to be detected for impedance detection.

[0029] The control module 410 includes an MCU (processing chip), and the impedance detection module 420 is used for impedance detection of the battery pack 50 to be detected. The control module 410 and the impedance detection module 420 can be connected by SPI communication mode. The detection current signal can be an alternating current signal of 1-10 kHz.

[0030] For example, based on the control module 410 connected to the impedance detection module 420, the impedance detection module 420 connected to the battery pack 50 to be detected, and the control module 410 connected to the power conversion module 30, the control module 410 can trigger the impedance detection module 420 to work, so that the impedance detection module 420 transmits a detection current signal (such as a 1 kHz sine wave signal) to the battery pack 50 to be detected, and then performs impedance detection on the battery pack 50 to be detected receiving the detection current signal, without the need for manual judgment of the internal resistance of the battery pack 50 to be detected. According to the detected internal resistance of the battery pack 50 to be detected, the current compensation of the battery pack 50 to be detected is automatically triggered, the internal resistance polarization component of the battery pack 50 to be detected is automatically and quickly suppressed, the accuracy and reliability of the internal resistance adjustment are improved, and the service life of the battery is prolonged.

[0031] In one embodiment, as shown in Figure 3As shown, the impedance detection module 420 includes an excitation source circuit 422 and a signal acquisition circuit 424; the control module 410 is connected to the excitation source circuit 422 and the signal acquisition circuit 424 respectively, and the excitation source circuit 422 and the signal acquisition circuit 424 are connected to the battery pack 50 to be detected; the control module 410 is configured to control the excitation source circuit 422 to transmit a detection current signal to the battery pack 50 to be detected, so that the signal acquisition circuit 424 acquires an electrical signal of the battery pack 50 to be detected to obtain an acquisition signal; the control module 410 is also configured to transmit a target control signal to the power conversion module 30 according to the acquisition signal.

[0032] The excitation source circuit 422 is configured to generate the detection current signal; and the signal acquisition circuit 424 is configured to acquire the electrical signal of the battery pack 50 to be detected.

[0033] Based on that the control module 410 is connected to the excitation source circuit 422, the excitation source circuit 422 is connected to the battery pack 50 to be detected, and then the control module 410 controls the excitation source circuit 422 to start working, so that the excitation source circuit 422 outputs the detection current signal to the battery pack 50 to be detected. Based on that the control module 410 is connected to the signal acquisition circuit 424, the signal acquisition circuit 424 is connected to the battery pack 50 to be detected, and then the signal acquisition circuit 424 acquires the electrical signal of the battery pack 50 to be detected receiving the detection current signal, and transmits the acquired acquisition signal to the control module 410, and then the control module 410 outputs the target control signal to the power conversion module 30 according to the received acquisition signal, so that the power conversion module 30 starts working according to the target control signal, and then the power conversion module 30 transmits a target driving signal corresponding to the target control signal to the isolation driving module 20, and the isolation driving module 20 drives the current compensation circuit 10 to work, so that the current compensation circuit 10 injects a corresponding compensation current into the battery pack 50 to be detected, which realizes automatic and rapid suppression of the internal resistance polarization component of the battery pack 50 to be detected, without the need for manual adjustment of the battery internal resistance, improves the accuracy and reliability of the internal resistance adjustment, and improves the service life of the battery.

[0034] In one embodiment, as shown in Figure 3 The excitation source circuit 422 includes a waveform generator 4222, an operational amplifier 4224 and a voltage-controlled current source 4226; the input end of the waveform generator 4222 is connected to the control module 410, the output end of the waveform generator 4222 is connected to the input end of the operational amplifier 4224, the output end of the operational amplifier 4224 is connected to the voltage-controlled current source 4226, and the voltage-controlled current source 4226 is connected to the battery pack 50 to be detected.

[0035] The waveform generator 4222 can be a DDS (Direct Digital Synthesizer) device, used to output a sine wave signal. For example, the waveform generator 4222 can be an AD9834 chip. The operational amplifier 4224 amplifies the sine wave signal transmitted by the waveform generator 4222 to obtain an amplified signal. The voltage-controlled current source 4226 transmits a detection current signal to the battery pack under test 50 based on the amplified signal transmitted by the operational amplifier 4224.

[0036] Based on the control module 410 connecting to the waveform generator 4222, which in turn connects to the operational amplifier 4224, which in turn connects to the voltage-controlled current source 4226, which in turn connects to the battery pack under test 50, the control module 410 triggers the waveform generator 4222 to start working, causing it to generate a sine wave signal and transmit it to the operational amplifier 4224. The operational amplifier 4224 amplifies the input sine wave signal to obtain an amplified signal, which is then transmitted to the voltage-controlled current source 4226. The voltage-controlled current source 4226, based on the received discharge signal, transmits a detection current signal to the battery pack under test 50. The signal acquisition circuit 424 acquires electrical signals from the battery pack 50 under test. The control module 410 then outputs a target control signal to the power conversion module 30 based on the acquired signal. The power conversion module 30 then starts operating according to the target control signal. The power conversion module 30 then transmits a target drive signal corresponding to the target control signal to the isolation drive module 20. The isolation drive module 20 drives the current compensation circuit 10 to inject a corresponding compensation current into the battery pack 50 under test. This automatically and quickly suppresses the internal resistance polarization component of the battery pack 50 without requiring manual adjustment of the battery's internal resistance, reducing internal resistance adjustment errors and extending battery life.

[0037] In one embodiment, such as Figure 3 As shown, the signal acquisition circuit 424 includes a current acquisition module 4242 and a voltage acquisition module 4244; the current acquisition module 4242 is connected to the battery pack under test 50 and the control module 410 respectively, and the voltage acquisition module 4244 is connected to the battery pack under test 50 and the control module 410 respectively.

[0038] Among them, the current acquisition module 4242 can be a shunt, and the current acquisition module 4242 is used to acquire the current of the battery pack 50 under test; the voltage acquisition module 4244 can acquire the voltage of the battery pack by means of resistor voltage division.

[0039] The current collection module 4242 is connected to the battery pack 50 under test and the control module 410, respectively, and then after the excitation source circuit 422 transmits the detection current signal to the battery pack 50 under test, the current collection module 4242 collects the current of the battery pack 50 under test and transmits the collected current signal to the control module 410. The voltage collection module 4244 is connected to the battery pack 50 under test and the control module 410, respectively, and then after the excitation source circuit 422 transmits the detection current signal to the battery pack 50 under test, the voltage collection module 4244 collects the voltage of the battery pack 50 under test and transmits the collected voltage signal to the control module 410, so that the control module 410 can trigger the power conversion module 30 to start working according to the current signal and the voltage signal, realize the determination of the internal resistance of the battery pack 50 under test by detecting the current and voltage of the battery pack 50 under test, so as to trigger the current compensation circuit 10 to inject the corresponding compensation current into the battery pack 50 under test, and realize the automatic and rapid suppression of the internal resistance polarization component of the battery pack 50 under test.

[0040] In one embodiment, as shown in Figure 4 The control module 410 includes a processor 412 and a lock-in amplifier 414; the input end of the lock-in amplifier 414 is connected to the signal collection circuit 424, and the output end of the lock-in amplifier 414 is connected to the processor 412.

[0041] The lock-in amplifier 414 can be used to process the collected signal input by the signal collection circuit 424 and transmit the processing result to the processor 412, and then the processor 412 triggers the power conversion module 30 to work according to the processing result of the lock-in amplifier 414.

[0042] For example, the signal collection circuit 424 can transmit the collected current signal and voltage signal to the lock-in amplifier 414, process the current signal and voltage signal through the lock-in amplifier 414 to obtain the processed signal, realize the internal resistance detection of the battery pack 50 under test, and then the lock-in amplifier 414 transmits the processed signal to the processor 412, and then the processor 412 compares the processed signal based on the existing program loaded in advance, to determine whether the internal resistance of the battery pack 50 under test is too large, if it is too large, the power conversion module 30 is triggered to work, so that the power conversion module 30 transmits the target drive signal corresponding to the target control signal to the isolation drive module 20, the isolation drive module 20 drives the current compensation circuit 10 to work, so that the current compensation circuit 10 injects the corresponding compensation current into the battery pack 50 under test, and realizes the automatic and rapid suppression of the internal resistance polarization component of the battery pack 50 under test.

[0043] In one embodiment, as shown in Figure 5As shown, the current compensation circuit 10 includes a switch tube module 110 and a transformer 120; the switch tube module 110 is connected to the isolation driving module 20, the switch tube module 110 is connected to the transformer 120, and the transformer 120 is connected to the battery pack 50 to be tested.

[0044] Among them, the switch tube module 110 can be a MOS bridge arm circuit, and the transformer 120 can be a high-frequency transformer.

[0045] Based on the connection of the switch tube module 110 to the isolation driving module 20 and the transformer 120 respectively, and the connection of the transformer 120 to the battery pack 50 to be tested, the control device 40 triggers the transmission of a target control signal to the power conversion module 30 according to the impedance detection result of the battery pack 50 to be tested, the power conversion module 30 transmits a target driving signal corresponding to the target control signal to the isolation driving module 20, so that the isolation driving module 20 drives the switch tube module 110 to work in conduction, and then the transformer 120 is turned on, so that the transformer 120 generates a compensation current signal and injects a corresponding compensation current into the battery pack 50 to be tested, thereby automatically and quickly suppressing the internal resistance polarization component of the battery pack 50 to be tested, without the need for manual adjustment of the battery internal resistance, improving the accuracy and reliability of the internal resistance adjustment, and prolonging the service life of the battery.

[0046] In one embodiment, as shown in Figure 5 The battery internal resistance suppression system further includes an auxiliary power supply 60; the input end of the auxiliary power supply 60 is connected to the battery pack 50 to be tested, and the output end of the auxiliary power supply 60 is connected to the control device 40, the current compensation circuit 10, the power conversion module 30 and the isolation driving module 20 respectively.

[0047] Among them, the auxiliary power supply 60 is used to convert the high-voltage electric signal transmitted by the battery pack 50 to be tested into a low-voltage electric signal meeting the power supply requirements of the control device 40, the current compensation circuit 10, the power conversion module 30 and the isolation driving module 20, so as to power the control device 40, the current compensation circuit 10, the power conversion module 30 and the isolation driving module 20. It should be noted that the low-voltage electric signal can be but is not limited to 3.3V, 5V and 15V.

[0048] In one embodiment, as shown in Figure 5 The power conversion module 30 includes a bidirectional DCDC module 310, the first end of the bidirectional DCDC module 310 is connected to the auxiliary power supply 60, the second end of the bidirectional DCDC module 310 is connected to the isolation driving module 20, and the control end of the bidirectional DCDC module 310 is connected to the control device 40.

[0049] For example, the bidirectional DCDC module 310 can include a first switch tube module, a second switch tube module, and an isolation transformer connected between the first switch tube module and the second switch tube module, the first switch tube module and the second switch tube are respectively connected to the control device 40, the first switch tube module is connected to the auxiliary power supply 60, and the second switch tube is connected to the isolation driving module 20. The first switch tube module can include four first MOS tubes, and the four first MOS tubes form a first MOS bridge arm. The second switch tube module can include four second MOS tubes, and the four second MOS tubes form a second MOS bridge arm.

[0050] The control device 40 detects the impedance of the battery pack 50 to be tested, and transmits a target control signal to the bidirectional DCDC module 310 according to the result of the impedance detection, so that the bidirectional DCDC module 310 is turned on and works, and then converts the low-voltage electrical signal transmitted by the auxiliary power supply 60 into a target driving signal, and transmits the target driving signal to the isolation driving module 20, so as to drive the current compensation circuit 10 to work through the isolation driving module 20, so that the current compensation circuit 10 injects corresponding compensation current into the battery pack 50 to be tested, realizes automatic and rapid suppression of the internal resistance polarization component of the battery pack 50 to be tested, and does not need to artificially adjust the battery internal resistance, improves the accuracy and reliability of the internal resistance adjustment, and prolongs the service life of the battery.

[0051] In one example, the control device 40 further includes a pulse generation module, and the pulse generation module is respectively connected to the processor 412 and the power conversion module 30. The processor 412 controls the pulse generation module to work according to the result of the impedance detection of the battery pack 50 to be tested, and then the pulse generation module transmits a target control signal to the power conversion module 30. It should be noted that the target control signal can be a PWM signal; and the pulse generation module can be an HRTIM (High Resolution Timer, high resolution timer) module.

[0052] In one embodiment, a battery internal resistance suppression system is also provided, which includes a cabinet, a battery pack to be tested, and the battery internal resistance suppression system according to any one of the above embodiments. The battery pack to be tested and the battery internal resistance suppression system are arranged in the cabinet, and the battery internal resistance suppression system is connected to the battery pack to be tested.

[0053] The cabinet can be, but is not limited to, a square cabinet, and the cabinet is provided with a battery compartment and an electrical compartment. The battery compartment is used to accommodate at least one battery pack to be tested, and the electrical compartment is used to accommodate the battery internal resistance suppression system. For specific description of the battery internal resistance suppression system, please refer to the description of the above embodiments, which will not be repeated here.

[0054] The battery resistance suppression system is connected to the battery pack to be tested, a control device in the battery resistance suppression system detects the impedance of the battery pack to be tested, and according to the result of the impedance detection, a target control signal is transmitted to a power conversion module; the power conversion module is used for transmitting a target driving signal to an isolation driving module according to the target control signal, so that the isolation driving module drives a current compensation circuit to compensate the current of the battery pack to be tested, and the internal resistance polarization component of the battery pack to be tested is automatically and quickly suppressed, without manual adjustment of the battery resistance, the accuracy and reliability of the internal resistance adjustment are improved, and the service life of the energy storage battery cabinet is improved.

[0055] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0056] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery internal resistance suppression system, characterized in that, include: A current compensation circuit, which is used to connect to the battery pack under test; An isolation drive module, wherein the isolation drive module is connected to the current compensation circuit; A power conversion module, wherein the power conversion module is connected to the isolation drive module and the battery pack under test respectively; Control device, wherein the control device is connected to the power conversion module and the battery pack under test respectively; The control device is configured to perform impedance detection on the battery pack under test and transmit a target control signal to the power conversion module based on the impedance detection result; the power conversion module is used to transmit a target drive signal to the isolation drive module based on the target control signal, so that the isolation drive module drives the current compensation circuit to perform current compensation on the battery pack under test.

2. The battery internal resistance suppression system according to claim 1, characterized in that, The control device includes a control module and an impedance detection module; The control module is connected to the impedance detection module and the power conversion module respectively, and the impedance detection module is connected to the battery pack under test; The control module is configured to control the impedance detection module to transmit a detection current signal to the battery pack under test in order to perform impedance detection on the battery pack under test.

3. The battery internal resistance suppression system according to claim 2, characterized in that, The impedance detection module includes an excitation source circuit and a signal acquisition circuit; the control module is connected to the excitation source circuit and the signal acquisition circuit respectively, and the excitation source circuit and the signal acquisition circuit are connected to the battery pack under test respectively; The control module is configured to control the excitation source circuit to transmit a detection current signal to the battery pack under test, so that the signal acquisition circuit can acquire electrical signals from the battery pack under test and obtain the acquired signal. The control module is also configured to transmit the target control signal to the power conversion module based on the acquired signal.

4. The battery internal resistance suppression system according to claim 3, characterized in that, The excitation source circuit includes a waveform generator, an operational amplifier, and a voltage-controlled current source; The input terminal of the waveform generator is connected to the control module, the output terminal of the waveform generator is connected to the input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the voltage-controlled current source, and the voltage-controlled current source is connected to the battery pack under test.

5. The battery internal resistance suppression system according to claim 3, characterized in that, The control module includes a processor and a lock-in amplifier; The input terminal of the lock-in amplifier is connected to the signal acquisition circuit, and the output terminal of the lock-in amplifier is connected to the processor.

6. The battery internal resistance suppression system according to claim 3, characterized in that, The signal acquisition circuit includes a current acquisition module and a voltage acquisition module; The current acquisition module is connected to the battery pack under test and the control module, respectively, and the voltage acquisition module is connected to the battery pack under test and the control module, respectively.

7. The battery internal resistance suppression system according to claim 1, characterized in that, The current compensation circuit includes a switching transistor module and a transformer; The switching transistor module is connected to the isolation drive module, the switching transistor module is connected to the transformer, and the transformer is connected to the battery pack under test.

8. The battery internal resistance suppression system according to any one of claims 1 to 7, characterized in that, It also includes auxiliary power supply; The input terminal of the auxiliary power supply is connected to the battery pack under test, and the output terminal of the auxiliary power supply is connected to the control device, the current compensation circuit, the power conversion module and the isolation drive module respectively.

9. The battery internal resistance suppression system according to claim 8, characterized in that, The power conversion module includes a bidirectional DC-DC module; The first end of the bidirectional DC-DC module is connected to the auxiliary power supply, the second end of the bidirectional DC-DC module is connected to the isolation drive module, and the control end of the bidirectional DC-DC module is connected to the control device.

10. An energy storage battery cabinet, characterized in that, Includes a cabinet, a battery pack under test, and a battery internal resistance suppression system as described in any one of claims 1 to 9; The battery pack under test and the battery internal resistance suppression system are housed inside the cabinet, and the battery internal resistance suppression system is connected to the battery pack under test.

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