Battery detection system, battery detection method and vehicle

Abstract

The invention relates to a battery detection system, a battery detection method and a vehicle, and relates to the technical field of vehicles. The battery detection system comprises a charging and discharging circuit, a power battery and detection equipment, wherein the power battery is respectively connected with the charging and discharging circuit and the detection equipment; when the battery detection system is in a detection mode, the charging and discharging circuit is configured to send a detection signal to the power battery; the detection equipment is configured to receive a feedback signal for determining the service life of the power battery; the feedback signal is generated by the power battery based on the applied detection signal and is used for improving the accuracy of the determined service life of the battery.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, in particular to the field of vehicle technology, and specifically to a battery detection system, a battery detection method and a vehicle. Background Art

[0002] New energy vehicles use power batteries as an important power source. When the power battery life of the vehicle is insufficient, it will affect the normal driving of the vehicle. Therefore, it is necessary to determine the battery life of the power battery and let users know the battery life of the power battery in a timely manner.

[0003] In order to determine the battery life of a power battery, a related technical solution discloses a method for predicting the remaining life of lithium ions, the method comprising: taking a battery to be tested, and performing a cyclic charging and discharging test on the battery to be tested at a set current and voltage under a set working environment, collecting the number of cycles and the battery capacity data after each cycle; determining the remaining life of the battery based on the acquired battery capacity data and a preset formula. A method for intelligent monitoring of automotive batteries based on Internet of Vehicles big data technology is also disclosed, the method comprising: obtaining battery parameters such as battery voltage, current, and state of charge, and bringing the battery parameters into a life calculation model to obtain the battery life. Since this method directly brings the collected battery parameters into the existing life calculation model for calculation, it does not take into account the characteristics of different batteries and different vehicles, resulting in a low accuracy of the determined battery life. Summary of the invention

[0004] The present application provides a battery detection system, a battery detection method and a vehicle, which are used to improve the accuracy of battery life detection without adding a new power module. The technical solution of the present application is as follows: According to the first aspect provided by the present application, a battery detection system is provided, wherein the battery detection system 20 includes a charge and discharge circuit 21, a power battery 22, and a detection device 23, wherein the power battery 22 is connected to the charge and discharge circuit 21 and the detection device 23, respectively. When the battery detection system 20 is in the detection mode, the charge and discharge circuit 21 is configured to send a detection signal to the power battery 22. The detection device 23 is configured to receive a feedback signal for determining the battery life of the power battery 22. The feedback signal is generated by the power battery 22 based on the applied detection signal.

[0005] According to the above technical means, a detection signal is sent to the power battery 22 through the charge and discharge circuit 21, and the battery life of the power battery 22 is determined according to the feedback signal sent by the power battery 22. In this way, the battery life is determined by the electrochemical impedance measurement method. After the detection signal passes through the power battery 22, it will change according to the characteristics of the power battery 22, and a feedback signal is obtained. Subsequently, since the feedback signal can accurately reflect the battery characteristics of the power battery 22, the battery life of the power battery 22 is determined according to the battery characteristics of the power battery 22, thereby improving the accuracy of the determined battery life. In addition, in addition to the power supply function of the battery detection system itself, the battery detection system also integrates an electrochemical impedance measurement detection function, and the detection signal is sent to the power battery 22 through the charge and discharge circuit 21 of the battery detection system itself. There is no need to add a transmitting module and a power module to the vehicle, which reduces the cost.

[0006] In one possible embodiment, the battery detection system 20 also includes a storage battery 24, and the charge and discharge circuit 21 includes a bidirectional DC converter 211, one end of the bidirectional DC converter 211 is connected to the power battery 22, and the other end of the bidirectional DC converter 211 is connected to the storage battery 24; when the battery detection system 20 is in the detection mode, the bidirectional DC converter 211 is configured to: generate a detection signal and send the detection signal to the power battery 22.

[0007] According to the above technical means, the bidirectional DC converter 211 is used to generate a detection signal and send the detection signal to the power battery 22, so that the cost of the vehicle can be reduced.

[0008] In one possible manner, the detection signal is a high-voltage pulse current, and the bidirectional DC converter 211 is specifically configured to generate a high-voltage pulse current based on the low-voltage DC power provided by the battery 24 , and send the high-voltage pulse current to the power battery 22 .

[0009] According to the above technical means, a bidirectional DC converter 211 is used to generate a high-voltage pulse current, and the high-voltage pulse current is used to detect the battery characteristics of the power battery 22. Since the changes in the high-voltage pulse current can truly reflect the characteristics of the power battery, the detection accuracy of the power battery 22 can be improved.

[0010] In one possible embodiment, the charge and discharge circuit 21 also includes an inverter device 212 , one end of the inverter device 212 is configured to be connected to the AC power interface 25 , and the other end of the inverter device 212 is configured to be connected to the power battery 22 and also to the bidirectional DC converter 211 .

[0011] In one possible manner, when the battery detection system 20 is in the AC charging mode, the inverter device 212 is configured to: convert the mains power into a first DC power, and use the first DC power to charge the power battery 22 and provide the first DC power to the bidirectional DC converter 211. The bidirectional DC converter 211 is further configured to: step down the first DC power to obtain a second DC power, and use the second DC power to charge the storage battery 24.

[0012] In one possible embodiment, one end of the inverter device 212 is also configured to be connected to the AC load 26; when the battery detection system 20 is in the discharge mode, the charge and discharge circuit 21 is also configured to: convert the DC power provided by the power battery 22 into AC power through the inverter device 212, and use the AC power to power the AC load 26.

[0013] In one possible manner, when the battery detection system 20 is in the low-voltage charging mode, the bidirectional DC converter 211 is further configured to: step down the DC power provided by the power battery 22 to obtain a third DC power, and use the third DC power to charge the storage battery 24.

[0014] In a possible manner, the detection device 23 is further configured to determine the battery life of the power battery 22 according to the feedback signal and the detection signal.

[0015] In one possible manner, the inverter device 212 includes a rectifier inverter circuit and a resonant circuit.

[0016] According to a second aspect provided by the present application, a battery detection method is provided, which is applied to the battery detection system 20 as in the first aspect; the method comprises: when the battery detection system 20 is in a detection mode, using the charge and discharge circuit 21 to send a detection signal to the power battery 22. Using the detection device 23 to receive a feedback signal for determining the battery life of the power battery 22; the feedback signal is generated by the power battery 22 based on the applied detection signal.

[0017] In one possible embodiment, the charging and discharging circuit 21 of the battery detection system 20 includes a bidirectional DC converter 211 , and the battery detection system 20 also includes a storage battery 24 . The method further includes: generating a detection signal using the bidirectional DC converter 211 , and sending the detection signal to the power battery 22 .

[0018] According to a third aspect provided by the present application, a vehicle is provided, comprising the battery detection system 20 of the first aspect.

[0019] It should be noted that the technical effects brought about by any implementation method in the second aspect to the third aspect can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0022] Figure 1 is a schematic structural diagram of an electrochemical impedance measurement system according to an exemplary embodiment; Figure 2 is one of the structural schematic diagrams of a battery detection system according to an exemplary embodiment; Figure 3 is a second structural schematic diagram of a battery detection system according to an exemplary embodiment; Figure 4 is a flowchart of a battery detection method according to an exemplary embodiment; Figure 5 is a schematic diagram showing the flow direction of current in a battery detection system in a detection mode according to an exemplary embodiment; Figure 6 is a schematic diagram showing the flow direction of current in a battery detection system in an AC charging mode according to an exemplary embodiment; Figure 7 is a schematic diagram showing the flow direction of current in a battery detection system in a discharge mode according to an exemplary embodiment; Figure 8 is a schematic diagram showing the flow direction of current in a battery detection system in a low-voltage charging mode according to an exemplary embodiment; Fig. 9 It is a structural schematic diagram of a power supply system according to an exemplary embodiment. DETAILED DESCRIPTION

[0023] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0025] As described in the background art, the accuracy of the current life determination method by introducing battery parameters into the life calculation model is low. In order to improve the accuracy of battery life, the related art discloses an electrochemical impedance measurement system. Figure 1 As shown, Figure 1 An electrochemical impedance measurement system 10 is shown according to an exemplary embodiment, comprising: a power supply device 11, a transmitter device 12, a detection device 13 and a battery device 14. The transmitter device 12 is connected to the power supply device 11, the detection device 13 and the battery device 14 (such as a power battery) respectively, and the detection device 13 is connected to the battery device 14.

[0026] In the electrochemical impedance measurement system 10, the power supply device 11 supplies power to the transmitting device 12, so that the transmitting device 12 generates a detection signal and sends the detection signal to the battery device 14. Accordingly, the battery device 14 is applied with the detection signal, and after the detection signal passes through the battery device 14, the battery device 14 outputs a feedback signal to the detection device 13. The feedback signal is generated after the detection signal passes through the battery device 14.

[0027] Subsequently, the detection device 13 receives the feedback signal from the battery device 14, and determines the battery life of the battery device 14 according to the feedback signal. In this way, after the detection signal passes through the battery device 14, it will change according to the characteristics of the battery device 14 (such as the cell resistance and capacitance), and obtain the feedback signal. In this way, according to the changes of the detection signal and the feedback signal, the current real state of the battery device 14 can be determined, thereby obtaining a more accurate battery life of the battery device 14.

[0028] However, in the electrochemical impedance measurement system 10 , a power supply device 11 needs to be added to the vehicle, which results in an increase in the cost of the entire vehicle.

[0029] In order to solve the above technical problems, Figure 2 FIG. 2 is a battery detection system 20 according to an exemplary embodiment. Figure 2In the embodiment, the battery detection system 20 includes a charge and discharge circuit 21, a power battery 22, and a detection device 23. The power battery 22 is connected to the charge and discharge circuit 21 and the detection device 23 respectively. When the battery detection system 20 is in the detection mode, the charge and discharge circuit 21 is configured to send a detection signal to the power battery 22.

[0030] In some embodiments, Figure 2 As shown, the charge and discharge circuit 21 is connected to the detection device 23 .

[0031] The detection device 23 is configured to receive a feedback signal for determining the battery life of the power battery 22. The feedback signal is generated by the power battery based on the applied detection signal.

[0032] As a possible implementation method, in response to the battery detection instruction, the battery detection system 20 is controlled to enter the detection mode. Further, the charge and discharge circuit 21 is configured to generate a detection signal and supply power to the power battery 22 .

[0033] In the embodiment of the present application, the charge and discharge circuit 21 is a circuit for realizing the charging and discharging functions of the power battery 22 .

[0034] In some embodiments, the battery detection system 20 further includes a power supply device, and the charge and discharge circuit 21 includes a transmitter device, one end of the transmitter device is connected to the power battery 22, and the other end of the transmitter device is connected to the storage battery. When the battery detection system 20 is in the detection mode, the transmitter device is configured to: generate a detection signal and send the detection signal to the power battery 22. The power supply device is configured to: supply power to the transmitter device.

[0035] In the embodiment of the present application, the transmitting device may be a device that generates a detection signal. For example, the transmitting device may be a signal transmitting module (such as the transmitting device 12 described above), or may be a current regulating device with a signal transmitting function (such as a bidirectional DC converter). The power supply device may be a device that supplies power to the transmitting device. For example, the power supply device may be a device that provides direct current, or may be a device that provides alternating current. The embodiment of the present application does not specifically limit the transmitting device and the power supply device.

[0036] For example, Figure 3 As shown, the power supply device is a storage battery 24, and the transmitting device is a bidirectional DC converter 211. One end of the bidirectional DC converter 211 is connected to the power battery 22, and the other end of the bidirectional DC converter 211 is connected to the storage battery. When the battery detection system 20 is in the detection mode, the bidirectional DC converter 211 is configured to generate a detection signal and send the detection signal to the power battery. The storage battery 24 is configured to supply power to the bidirectional DC converter 211.

[0037] In some embodiments, the bidirectional DC converter 211 is configured to superimpose different frequency signals on the current provided by the battery 24 according to detection requirements to generate a high-voltage pulse current of a target spectrum.

[0038] In the embodiment of the present application, the high-voltage pulse current is a pulse current greater than a preset voltage threshold. The preset voltage threshold may be 110V or 200V, which is not limited in the embodiment of the present application. Exemplarily, the high-voltage pulse current is a pulse current of 220V.

[0039] In the embodiment of the present application, the voltage of the battery 24 can be 12V or 24V, which is not limited in the embodiment of the present application. It can be understood that the bidirectional DC converter 211 is used to generate a detection signal and send the detection signal to the power battery 22, thereby reducing the cost of the vehicle.

[0040] In other embodiments, the charge and discharge circuit 21, in response to the signal generation instruction, generates a detection signal corresponding to the signal generation instruction according to the signal generation instruction, and sends the detection signal to the power battery 22. The signal generation instruction is used to instruct the transmitting device 12 to generate a detection signal with specific characteristics. The detection signal with specific characteristics is related to the battery parameters (such as voltage, current or impedance) of the power battery 22.

[0041] Specifically, the processor of the vehicle where the battery detection system 20 is located obtains the battery parameters of the battery device, and obtains the characteristics of the detection signal according to the battery parameters and the signal determination algorithm. Further, the processor generates a signal generation instruction according to the characteristics of the detection signal, and sends the signal generation instruction to the charge and discharge circuit 21.

[0042] For example, the battery detection system 20 generates a signal generation instruction according to the model, current voltage, current current and signal determination algorithm of the power battery 22. The signal generation instruction is used to instruct the charge and discharge circuit 21 to generate a detection signal with a target spectrum.

[0043] It should be noted that the signal determination algorithm is pre-configured by the operation and maintenance personnel. The detection signal may be a pulse current.

[0044] In the embodiment of the present application, the detection signal may be a high-voltage pulse current. The bidirectional DC converter 211 is specifically configured to generate a high-voltage pulse current according to the low-voltage DC power provided by the battery, and send the high-voltage pulse current to the power battery.

[0045] In some embodiments, the charge and discharge circuit 21 may also output pulse currents of different spectra according to detection requirements. For example, the charge and discharge circuit 21 outputs different pulse currents according to different battery parameters of the power battery 22 .

[0046] The detection device 23 is configured to receive a feedback signal for determining the battery life of the power battery 22 .

[0047] The feedback signal is generated by the power battery 22 based on the applied detection signal.

[0048] In the embodiment of the present application, the feedback signal is a signal obtained by changing the detection signal after passing through the power battery 22. For example, the detection signal is a first pulse current, and after the first pulse current is applied to the power battery 22 and passes through the battery cell of the power battery 22, the first pulse current changes to a second pulse current. Subsequently, the power battery 22 sends a second pulse signal to the detection device 23.

[0049] As a possible implementation manner, the detection device 23 is configured to: receive a feedback signal from the power battery 22 , and determine the battery life of the power battery 22 according to the feedback signal.

[0050] In some embodiments, the detection device 23 is configured to collect voltage and current parameters returned from the power battery 22, parse the electrochemical impedance spectrum of the battery device based on the voltage and current parameters, and calculate information related to the battery device based on the electrochemical impedance spectrum, such as calculating the battery life of the battery device.

[0051] In some embodiments, the detection device 23 obtains the first signal feature of the feedback signal, and determines the battery life of the power battery 22 according to the first signal feature and the second signal feature of the detection signal. For example, the first signal feature and the second signal feature are input into the life determination model to obtain the battery life of the power battery 22.

[0052] In other embodiments, the detection device 23 sends a feedback signal to a processor of the vehicle. Subsequently, the processor determines the battery life of the power battery 22 according to the feedback signal.

[0053] Alternatively, the detection device 23 sends the feedback signal to the server via the communication device. Accordingly, the server determines the battery life of the power battery 22 according to the feedback signal, and generates a detection result according to the battery life. Further, the server sends the detection result to the vehicle. Accordingly, the vehicle receives the detection result from the server and displays the detection result.

[0054] In some embodiments, the detection device 23 may be located in the power battery 22 or outside the power battery 22 , which is not limited in the embodiments of the present application.

[0055] The battery detection system provided in the embodiment of the present application brings at least the following beneficial effects: a detection signal is sent to the power battery 22 through the charge and discharge circuit 21, and the battery life of the power battery 22 is determined according to the feedback signal sent by the power battery 22. In this way, the battery life is determined by the electrochemical impedance measurement method. After the detection signal passes through the power battery 22, it will change according to the characteristics of the power battery 22, and a feedback signal is obtained. Subsequently, since the feedback signal can accurately reflect the battery characteristics of the power battery 22, the battery life of the power battery 22 is determined according to the battery characteristics of the power battery 22, thereby improving the accuracy of the determined battery life. In addition, in addition to the power supply function of the battery detection system itself, the battery detection system also integrates an electrochemical impedance measurement detection function, and the detection signal is sent to the power battery 22 through the charge and discharge circuit 21 of the battery detection system itself. There is no need to add a new transmission module and a power module in the vehicle, which reduces the cost.

[0056] In one design, the battery detection system 20 further includes an inverter 212. Figure 3 As shown, one end of the inverter device 212 is configured to be connected to the mains interface 25 , and the other end of the inverter device 212 is configured to be connected to the power battery 22 and also to the bidirectional DC converter 211 .

[0057] The embodiment of the present application does not specifically limit the specific structure of the inverter device 212, and it only needs to be able to achieve AC to DC conversion and DC to AC conversion. For example, the inverter device 212 includes a rectifier inverter circuit and a resonant circuit. Alternatively, the inverter device 212 includes a power factor correction circuit and a resonant circuit.

[0058] In one design, when the battery detection system 20 is in the AC charging mode, the inverter device 212 is configured to: convert the mains power into a first DC power, and use the first DC power to charge the power battery and provide the first DC power to the bidirectional DC converter 211. The bidirectional DC converter 211 is also configured to: step down the first DC power to obtain a second DC power, and use the second DC power to charge the battery.

[0059] In one design, one end of the inverter device 212 is also configured to be connected to the AC load 26; when the battery detection system 20 is in the discharge mode, the charge and discharge circuit 21 is also configured to: convert the DC power provided by the power battery 22 into AC power through the inverter device 212, and use the AC power to power the AC load 26.

[0060] In one design, when the battery detection system 20 is in a low-voltage charging mode, the bidirectional DC converter 211 is further configured to: step down the DC power provided by the power battery 22 to obtain a third DC power, and use the third DC power to charge the storage battery 24.

[0061] On this basis, a battery detection method provided by the present application is applied to the above-mentioned battery detection system 20, such as Figure 4 , which is a flow chart of a battery detection method according to an exemplary embodiment, the battery detection method includes: S401 - S402.

[0062] S401 : When the battery detection system 20 is in the detection mode, the charge and discharge circuit 21 is used to send a detection signal to the power battery 22 .

[0063] S402 : Utilize the detection device 23 to receive a feedback signal for determining the battery life of the power battery 22 .

[0064] The feedback signal is generated by the power battery 22 based on the applied detection signal.

[0065] In some embodiments, the battery detection method provided in the embodiments of the present application further includes: S403-S404.

[0066] S403 , using the bidirectional DC converter 211 to generate a detection signal.

[0067] S404 , sending a detection signal to the power battery 22 .

[0068] In some embodiments, the battery detection method provided by the embodiments of the present application further includes: S405.

[0069] S405 : The detection device 23 determines the battery life of the power battery 22 according to the detection signal and the feedback signal.

[0070] In some embodiments, the battery detection method provided in the embodiments of the present application further includes: S406-S408.

[0071] S406 : When the battery detection system 20 is in the AC charging mode, the inverter device 212 is used to convert the AC power into the first DC power.

[0072] S407 , using the first direct current to charge the power battery 22 and provide the first direct current to the bidirectional direct current converter 211 .

[0073] S408 , using the bidirectional DC converter 211 to step down the first DC power to obtain a second DC power, and using the second DC power to charge the battery 24 .

[0074] In some embodiments, the battery detection method provided in the embodiments of the present application further includes: S409-S410.

[0075] S409 , when the battery detection system 20 is in the low-voltage charging mode, the bidirectional DC converter 211 is used to reduce the voltage of the DC power provided by the power battery 22 to obtain a third DC power.

[0076] S410 : Charge the storage battery 24 using the third direct current.

[0077] In order to better understand the battery detection system 20 and the operation mode of the battery detection system 20 provided in the embodiment of the present application, a schematic diagram of the operation of the battery detection system 20 in different operation modes is provided below.

[0078] Combination Figure 3 ,like Figure 5 , which is a schematic diagram of current flow direction of a battery detection system 20 in a detection mode according to an exemplary embodiment.

[0079] Specifically, when the battery detection system 20 is in the detection mode, Figure 5 As shown, the storage battery 24 provides low-voltage direct current to the bidirectional direct current converter 211. Accordingly, the bidirectional direct current converter 211 performs inversion processing on the low-voltage direct current, generates a first high-voltage pulse current with a target spectrum, and transmits the first high-voltage pulse current to the power battery 22. Subsequently, the power battery 22 outputs a second high-voltage pulse current to the detection device 23. The second high-voltage pulse current is the first high-voltage pulse current passing through the battery cell of the power battery 22.

[0080] Combination Figure 3 ,like Figure 6 , which is a schematic diagram of current flow of a battery detection system 20 in an AC charging mode according to an exemplary embodiment.

[0081] Specifically, when the mode of the battery detection system 20 is the first charging mode, Figure 6 As shown, the mains power is supplied through the mains power interface 25 ( Figure 6 220V AC) is input into the inverter device 212. The inverter device 212 outputs high-voltage DC power to charge the power battery 22. In addition, the inverter device 212 also inputs high-voltage DC power to the bidirectional DC converter 211. The bidirectional DC converter 211 steps down the high-voltage DC power to obtain low-voltage DC power, and uses the low-voltage DC power to charge the battery 24.

[0082] Combination Figure 3 ,like Figure 7 , which is a schematic diagram of current flow direction of a battery detection system 20 in a discharge mode according to an exemplary embodiment.

[0083] Specifically, when the battery detection system 20 is in the discharge mode, Figure 7As shown, the high-voltage direct current provided by the power battery 22 is input into the inverter device 212. The inverter device 212 inverts the high-voltage direct current and supplies power to the AC load 26. The high-voltage direct current of the power battery 22 is input into the bidirectional direct current converter 211. Accordingly, the bidirectional direct current converter 211 steps down the high-voltage direct current to obtain low-voltage direct current, and uses the low-voltage direct current to charge the battery 24.

[0084] Combination Figure 3 ,like Figure 8 , which is a schematic diagram of current flow of a battery detection system 20 in a low-voltage charging mode according to an exemplary embodiment.

[0085] Specifically, when the battery detection system 20 is in the low-voltage charging mode, Figure 8 As shown, the high-voltage direct current provided by the power battery 22 is input into the bidirectional direct current converter 211. Accordingly, the bidirectional direct current converter 211 steps down the high-voltage direct current to obtain low-voltage direct current, and uses the low-voltage direct current to charge the storage battery 24.

[0086] An embodiment of the present application further provides a vehicle, which includes the above-mentioned battery detection system 20.

[0087] In other embodiments, Fig. 9 FIG. 1 is a diagram showing a power supply system 30 according to an exemplary embodiment. Fig. 9 In the embodiment, the power supply system 30 includes an inverter 31 and a DC converter 32. Fig. 9 In the embodiment, the inverter device 31 is respectively connected to the DC converter 32, the power battery 33 and the mains interface 34. The DC converter 32 is connected to the storage battery 35. The power supply system 30 is used to charge the power battery 33 and the storage battery 35, and to provide the power of the power battery 33 to the mains.

[0088] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery detection system, characterized in that: The battery detection system (20) comprises a charge and discharge circuit (21), a power battery (22) and a detection device (23); the power battery (22) is connected to the charge and discharge circuit (21) and the detection device (23) respectively; When the battery detection system (20) is in a detection mode, the charge and discharge circuit (21) is configured to: send a detection signal to the power battery (22); The detection device (23) is configured to: receive a feedback signal for determining the battery life of the power battery (22); the feedback signal is generated by the power battery (22) based on the applied detection signal; The battery detection system (20) further includes a storage battery (24); The charging and discharging circuit (21) comprises a bidirectional DC converter (211), one end of the bidirectional DC converter (211) is connected to the power battery (22), and the other end of the bidirectional DC converter (211) is connected to the storage battery (24); When the battery detection system (20) is in a detection mode, the bidirectional DC converter (211) is configured to: generate the detection signal, and send the detection signal to the power battery (22); The detection signal is a high-voltage pulse current, and the bidirectional DC converter (211) is specifically configured to generate the high-voltage pulse current according to the low-voltage direct current provided by the storage battery (24), and send the high-voltage pulse current to the power battery (22).

2. The battery detection system (20) according to claim 1, characterized in that: The charging and discharging circuit (21) further comprises an inverter device (212), one end of the inverter device (212) being configured to be connected to a mains power interface (25), and the other end of the inverter device (212) being configured to be connected to the power battery (22) and also to the bidirectional DC converter (211).

3. The battery detection system (20) according to claim 2, characterized in that: When the battery detection system (20) is in an AC charging mode, the inverter device (212) is configured to: convert the mains electricity into a first direct current, and use the first direct current to charge the power battery (22) and provide the first direct current to the bidirectional direct current converter (211); The bidirectional DC converter (211) is further configured to: step down the voltage of the first DC power to obtain a second DC power, and use the second DC power to charge the storage battery (24).

4. The battery detection system (20) according to claim 2, characterized in that: One end of the inverter device (212) is further configured to be connected to an AC load (26); when the battery detection system (20) is in a discharge mode, the charge and discharge circuit (21) is further configured to: convert the direct current provided by the power battery (22) into alternating current through the inverter device (212), and use the alternating current to supply power to the AC load (26).

5. The battery detection system (20) according to claim 2, characterized in that: When the battery detection system (20) is in a low-voltage charging mode, the bidirectional DC converter (211) is further configured to: step down the DC power provided by the power battery (22) to obtain a third DC power, and use the third DC power to charge the storage battery (24).

6. The battery detection system (20) according to any one of claims 1 to 4, characterized in that: The detection device (23) is further configured to determine the battery life of the power battery (22) according to the feedback signal and the detection signal.

7. The battery detection system (20) according to any one of claims 2 to 4, characterized in that: The inverter device (212) comprises a rectifier inverter circuit and a resonant circuit.

8. A battery detection method, characterized in that: A battery detection system (20) applied to any one of claims 1 to 7; the method comprising: When the battery detection system (20) is in a detection mode, using the charge and discharge circuit (21) to send the detection signal to the power battery (22); The detection device (23) is used to receive the feedback signal used to determine the battery life of the power battery (22); the feedback signal is generated by the power battery (22) based on the applied detection signal.

9. The method according to claim 8, characterized in that The charging and discharging circuit (21) of the battery detection system (20) comprises a bidirectional DC converter (211), the battery detection system (20) further comprises a storage battery (24), and the method further comprises: The detection signal is generated by using a bidirectional direct current converter (211), and the detection signal is sent to the power battery (22).

10. A vehicle, characterized in that: It comprises a battery detection system (20) as claimed in any one of claims 1 to 7.

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