Current effectiveness detection method, power supply system, medium, and device

Abstract

A current effectiveness detection method, a power supply system, a medium, and a device. The method comprises: when a battery pack is in an on state and a heating circuit is heating the battery pack, acquiring a voltage value and an effective resistance value of the heating circuit and a first current sampling value of the battery pack, wherein a battery system comprises the battery pack and the heating circuit which are connected in parallel, and the first current sampling value is an output current sampling value of the battery pack (S101); determining an actual current value of the heating circuit on the basis of the voltage value and the effective resistance value of the heating circuit (S102); and at least on the basis of the actual current value, detecting the effectiveness of the first current sampling value to obtain a detection result (S103).

Description

Current validity detection method, power supply system, medium and equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 202311194757.4, filed with the China Patent Office on September 14, 2023, entitled “Current Validity Detection Method, Power System, Medium and Equipment,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular, to a current validity detection method, a power supply system, a medium, and a device. Background Art

[0004] In new energy vehicles, batteries are used to provide power and other energy needs. During operation, battery current monitoring is necessary to prevent damage to the battery due to excessive current or malfunction due to insufficient current. Currently, battery current monitoring involves installing a current acquisition unit on the battery's main circuit. This unit collects the main circuit current to ensure normal battery operation and safety.

[0005] Summary of the Invention

[0006] The purpose of the present disclosure is to provide a current validity detection method, power supply system, medium and equipment, which can detect the validity of the current of the battery system without adding any additional structure and cost to the battery system, thereby improving the accuracy of battery system monitoring and thus enhancing the safety of the vehicle.

[0007] To achieve the above objectives, the present disclosure provides, in a first aspect, a current validity detection method for a battery system, wherein the battery system includes a battery pack and a heating circuit connected in parallel. The method includes:

[0008] When the battery pack is in a conducting state and the heating circuit heats the battery pack, obtaining a voltage value, an effective resistance value, and a first current sampling value of the heating circuit, wherein the first current sampling value is an output current sampling value of the battery pack;

[0009] determining an actual current value of the heating circuit according to the voltage value and the effective resistance value of the heating circuit;

[0010] The validity of the first current sampling value is detected at least according to the current actual value to obtain a detection result.

[0011] Optionally, a heating device is provided in the heating circuit; and obtaining the effective resistance value of the heating circuit includes:

[0012] Obtaining a temperature value of the heating device;

[0013] According to the corresponding relationship between the preset temperature value and the resistance value, the resistance value corresponding to the temperature value is determined, and the resistance value is determined as the effective resistance value of the heating circuit.

[0014] Optionally, a contactor is further provided in the heating circuit, and the contactor is connected in series with the heating device; the method further comprises:

[0015] In response to a request to detect the validity of the first current sampling value of the battery pack, the contactor is controlled to be closed, so as to heat the battery pack through the heating device.

[0016] Optionally, obtaining the voltage value of the heating circuit includes:

[0017] Obtaining the voltage of each single cell in the battery pack;

[0018] Determining the total voltage of the battery pack according to the voltage of each single battery;

[0019] The total voltage is determined as the voltage value of the heated circuit.

[0020] Optionally, obtaining the voltage value of the heating circuit further includes:

[0021] Acquiring the voltage across the battery pack through a voltage acquisition device;

[0022] detecting validity of the total voltage according to the voltage across the battery pack;

[0023] Determining the total voltage as the voltage value of the heating circuit includes:

[0024] When it is determined that the total voltage is valid, the total voltage is determined as the voltage value of the heating circuit.

[0025] Optionally, the detecting the validity of the total voltage according to the voltages across the battery pack includes:

[0026] determining a voltage deviation value between the voltage across the battery pack and the total voltage;

[0027] When the voltage deviation value is less than or equal to a preset voltage deviation threshold, it is determined that the total voltage is valid.

[0028] Optionally, the detecting the validity of the first current sampling value at least according to the current actual value to obtain a detection result includes:

[0029] Acquiring a load terminal state of the battery system, wherein the load terminal state includes a conducting state and a non-conducting state;

[0030] determining a current reference value according to the load terminal state and the actual current value;

[0031] The validity of the first current sampling value is detected according to the current reference value to obtain a detection result.

[0032] Optionally, the detecting the validity of the first current sampling value according to the current reference value to obtain a detection result includes:

[0033] Determining a current deviation value between the current reference value and the first current sampling value;

[0034] When the current deviation value is greater than a current deviation threshold, determining that the first current sampling value is invalid;

[0035] When the current deviation value is less than or equal to the current deviation threshold, it is determined that the first current sampling value is valid.

[0036] Optionally, determining the current reference value according to the load terminal state and the actual current value includes:

[0037] When the load terminal is in a non-conducting state, determining the actual current value as a current reference value;

[0038] When the load terminal is in the on state, a load terminal current value is obtained, and a sum of the actual current value and the load terminal current value is determined as a current reference value.

[0039] Optionally, when the detection result indicates that the first current sampling value is invalid, the method further includes:

[0040] Controlling the battery pack to switch to a non-conducting state after a preset time; and / or

[0041] A first invalid prompt message is sent to the vehicle controller, where the first invalid prompt message is used to prompt the vehicle controller that the first current sampling value of the battery pack is invalid.

[0042] Optionally, the method further includes:

[0043] When the battery pack is in a non-conducting state, obtaining a second current sampling value of the battery pack;

[0044] If the second current sampling value is greater than the zero drift error threshold, it is determined that the second current sampling value is invalid.

[0045] Optionally, when it is determined that the second current sampling value is invalid, the method further includes:

[0046] Sending a second invalid prompt message to the vehicle controller, where the second invalid prompt message is used to prompt the vehicle controller that the second current sampling value of the battery pack is invalid; and / or

[0047] Switching the battery pack to a conducting state is prohibited.

[0048] Optionally, the battery pack includes a plurality of batteries connected in series, or the battery pack includes a plurality of parallel branches, and each branch includes at least one battery.

[0049] A second aspect of the present disclosure further provides a power supply system, comprising: a battery system and a management device; the battery system comprising a battery pack and a heating circuit connected in parallel, the heating circuit being used to heat the battery pack; the management device being connected to the battery pack and the heating circuit, respectively;

[0050] The management device is used to: obtain the voltage value, effective resistance value and first current sampling value of the heating circuit when the battery pack is in a conductive state and the heating circuit heats the battery pack, wherein the first current sampling value is the output current sampling value of the battery pack; determine the actual current value of the heating circuit based on the voltage value and the effective resistance value of the heating circuit; and detect the validity of the first current sampling value at least based on the actual current value to obtain a detection result.

[0051] Optionally, the heating circuit includes a heating device;

[0052] The management device is used to: obtain the temperature value of the heating device;

[0053] According to the corresponding relationship between the preset temperature value and the resistance value, the resistance value corresponding to the temperature value is determined, and the resistance value is determined as the effective resistance value of the heating circuit.

[0054] Optionally, the heating circuit includes a contactor, and the contactor is connected in series with the heating device;

[0055] The management device is further configured to, in response to a request to detect the validity of the first current sampling value of the battery pack, control the contactor to close so as to heat the battery pack through the heating device.

[0056] Optionally, the management device is a battery management system BMS.

[0057] The third aspect of the present disclosure further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the first aspect of the present disclosure.

[0058] A fourth aspect of the present disclosure further provides an electric device, comprising:

[0059] A battery system comprising a battery pack and a heating circuit, wherein the battery pack and the heating circuit are connected in parallel, and the heating circuit is used to heat the battery pack;

[0060] a memory having a computer program stored thereon;

[0061] A processor is used to execute the computer program in the memory to implement the steps of the method provided in the first aspect of the present disclosure.

[0062] Through the above technical solution, when the battery pack is in the on state and the heating circuit is heating the battery pack, the voltage value, effective resistance value and first current sampling value of the heating circuit are obtained, and the actual current value of the heating circuit is determined based on the voltage value and effective resistance value of the heating circuit. At least the validity of the first current sampling value is detected based on the actual current value to obtain a detection result. In this way, the purpose of detecting the validity of the current sampling value of the battery pack can be achieved, the reliability of battery pack monitoring can be improved, and the safety of the vehicle can be improved. In addition, there is no need to increase the battery system structure and cost, which reduces the space occupied by the battery system. In addition, the actual current value of the heating circuit is determined based on the voltage value and effective resistance of the heating circuit. The actual current value can be determined through simple calculation, which simplifies the process of determining the actual current value.

[0063] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0065] FIG1 is a flow chart showing a method for detecting current validity according to an exemplary embodiment.

[0066] FIG2 is a block diagram showing a power supply system according to an exemplary embodiment.

[0067] Fig. 3 is a schematic diagram showing a power supply system according to an exemplary embodiment.

[0068] FIG4 is a schematic diagram showing a method for detecting current validity according to an exemplary embodiment.

[0069] FIG5 is a flowchart showing a method for detecting validity of a first current sampling value according to an exemplary embodiment. DETAILED DESCRIPTION

[0070] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0071] During actual monitoring, the current acquisition unit sends the collected current to the controller or battery management unit. The controller or battery management unit directly monitors the battery's charge and discharge status or power based on the current collected by the current acquisition unit, without checking the validity of the current. If the current acquisition unit experiences current drift or a fault, the current detected by the current acquisition unit is invalid. If the battery is monitored based on this invalid current, it may misdiagnose or miss faults such as overcurrent, posing a safety risk.

[0072] In related technologies, dual current detection devices are typically installed on the main circuit of a battery pack. The current validity is detected by comparing the currents collected by the dual current detection devices. However, considering that a battery pack includes multiple parallel battery pack branches, if dual current detection devices are installed in each branch, the battery system will be bulky, occupying a large space, and the cost of the battery system will also be high.

[0073] In view of this, the present disclosure provides a current validity detection method, power supply system, medium and equipment, which can detect the validity of the current of the battery system without adding any additional structure and cost to the battery system, thereby improving the accuracy of battery system monitoring and thus enhancing the safety of the vehicle.

[0074] Fig. 1 is a flow chart showing a method for detecting current validity according to an exemplary embodiment. As shown in Fig. 1 , the method may include the following steps.

[0075] In step S101 , when the battery pack is in a conducting state and the heating circuit is heating the battery pack, a voltage value and an effective resistance value of the heating circuit and a first current sampling value of the battery pack are obtained.

[0076] The battery system includes a battery pack and a heating circuit connected in parallel. The first current sampling value is an output current sampling value of the battery pack.

[0077] In the present disclosure, the executor of the current validity detection method may be a management device, which may include a controller, such as a vehicle controller, or a battery management system BMS. For the sake of convenience of description, in the present disclosure, the executor of the current validity detection method is taken as an example of a battery management system.

[0078] In step S102, the actual current value of the heating circuit is determined according to the voltage value and the effective resistance value of the heating circuit.

[0079] For example, the ratio of the voltage value to the effective resistance value of the heating circuit is determined as the actual current value of the heating circuit.

[0080] In step S103, the validity of the first current sampling value is detected at least according to the actual current value to obtain a detection result.

[0081] By adopting the above technical solution, when the battery pack is in the on state and the heating circuit is heating the battery pack, the voltage value, effective resistance value and first current sampling value of the heating circuit are obtained, and the actual current value of the heating circuit is determined based on the voltage value and effective resistance value of the heating circuit. At least the validity of the first current sampling value is tested based on the actual current value to obtain a test result. In this way, the purpose of testing the validity of the current sampling value of the battery pack can be achieved, the reliability of battery pack monitoring can be improved, and the safety of the vehicle can be improved. In addition, there is no need to increase the battery system structure and cost, which reduces the space occupied by the battery system. In addition, the actual current value of the heating circuit is determined based on the voltage value and effective resistance of the heating circuit. The actual current value can be determined through simple calculation, which simplifies the process of determining the actual current value.

[0082] In order to better understand the current validity detection method provided by the present disclosure, the current validity detection method is described in detail below with a complete embodiment.

[0083] FIG2 is a block diagram of a power supply system according to an exemplary embodiment. As shown in FIG2 , the power supply system includes a battery system and a management device 22. The battery system includes a battery pack 211 and a heating circuit 212, wherein the battery pack 211 and the heating circuit 212 are connected in parallel, and the heating circuit 212 is used to heat the battery pack 211. The management device 22 is connected to the battery pack 211 and the heating circuit 212, respectively. When the battery pack is in a conductive state and the heating circuit is heating the battery pack, the management device 22 is configured to obtain the voltage value, effective resistance value, and first current sampling value of the battery pack of the heating circuit, wherein the first current sampling value is the output current sampling value of the battery pack; determine the actual current value of the heating circuit based on the voltage value and effective resistance value of the heating circuit; and detect the validity of the first current sampling value based on at least the actual current value to obtain a detection result.

[0084] FIG3 is a schematic diagram of a power supply system according to an exemplary embodiment. The management device 22 includes a battery management system BMS221. As shown in FIG3 , the battery pack 211 may include multiple batteries connected in series, or the battery pack 211 may include multiple parallel branches, each of which includes at least one battery. In a branch including multiple battery packs, the multiple batteries are connected in series, and the battery may include multiple single cells. FIG3 illustrates the battery pack 211 as including two batteries connected in series, each of which includes two single cells.

[0085] One end of the heating circuit 212 is connected to one end of the battery pack 211 , and the other end of the heating circuit 212 is connected to the other end of the battery pack 211 . The heating circuit 212 is used to heat the battery pack 211 .

[0086] Furthermore, as shown in FIG3 , a current detection device 213 may be provided between the battery pack 211 and the heating circuit 212. For example, one end of the heating circuit 212 is connected to one end of the battery pack 211 via the current detection device 213. The current detection device 213 may be a current sensor, such as a Hall effect current sensor. This disclosure does not specifically limit this.

[0087] As shown in FIG3 , the BMS 221 is connected to the current detection device 213 , and is configured to obtain a first current sampling value through the current detection device 213 .

[0088] By way of example, the first current acquisition value may be the current value of the battery pack 211 acquired by the current detection device 213 in FIG3 . Accordingly, the BMS 221 obtains the first current sampling value from the current detection device 213 . By way of another example, the first current acquisition value may also be a current value obtained by parsing the current signal acquired by the current detection device 213 . Accordingly, the BMS 221 obtains the current signal from the current detection device 213 and parses the current signal to obtain the first current sampling value.

[0089] Obtaining the effective resistance of a heating circuit may include the following steps:

[0090] Step (1), obtaining the temperature value of the heating device in the heating circuit.

[0091] In the present disclosure, a heating device is provided in the heating circuit. For example, as shown in FIG3 , heating circuit 212 is provided with a heating device 2121 , which may be a heating film. Furthermore, in FIG3 , battery system 21 may also include a temperature sensor, which may be an NTC temperature sensor 214 .

[0092] In FIG3 , the NTC temperature sensor 214 is connected to the heating device 2121 for collecting the temperature value of the heating device 2121. The BMS 221 is also connected to the NTC temperature sensor 214 for obtaining the temperature value of the heating device 2121 through the NTC temperature sensor 214.

[0093] Step (2) determines the resistance value corresponding to the temperature value according to the corresponding relationship between the preset temperature value and the resistance value, and determines the resistance value as the effective resistance value of the heating circuit.

[0094] For example, the BMS 221 is used to obtain the temperature value of the heating device; determine the resistance value corresponding to the temperature value according to the preset correspondence between the temperature value and the resistance value, and determine the resistance value as the effective resistance value of the heating circuit.

[0095] It should be understood that the effective resistance value of the heating device varies with the temperature and aging of the heating device. In the present disclosure, to facilitate accurate calculation of the effective resistance value of the heating circuit and, therefore, accurately determine the actual current value of the heating circuit, the correspondence between temperature and resistance can be pre-calibrated based on the aging of the heating device. After obtaining the temperature value of the heating device in the heating circuit, the resistance value corresponding to the temperature value can be determined based on this correspondence, and this resistance value is determined as the effective resistance value of the heating circuit.

[0096] By adopting the above technical solution, taking into account that temperature will affect the effective resistance value of the heating circuit, the effective resistance value of the heating circuit is determined based on the temperature value of the heating device. In this way, the effective resistance value of the heating circuit can be accurately determined, thereby improving the accuracy of the actual current value of the determined heating circuit.

[0097] Optionally, a contactor is further provided in the heating circuit, and the contactor is connected in series with the heating device; the current validity detection method further includes:

[0098] In response to a request to detect the validity of the first current sampling value of the battery pack, the contactor is controlled to be closed to heat the battery pack through the heating device.

[0099] For example, the BMS 221 is configured to control the contactor to close in response to a request for detecting the validity of the first current sampling value of the battery pack, so as to heat the battery pack through the heating device.

[0100] As shown in FIG3 , the contactor may be a switch 2122, one end of which is connected to the heating device 2121, and the other end of which is connected to the current detection device 213. The BMS 221 is also connected to the switch 2122, and in response to a request to detect the validity of the first current sampling value of the battery pack, controls the switch 2122 to close, thereby heating the battery pack 211 via the heating device 2121.

[0101] Obtaining the voltage value of the heating circuit may include the following steps:

[0102] Step (3), obtaining the voltage of each single cell in the battery pack.

[0103] For example, as shown in FIG3 , the BMS 221 is connected to each single cell in the battery pack 211 to obtain the voltage of each single cell in the battery pack.

[0104] Step (4): determining the total voltage of the battery pack according to the voltage of each single battery.

[0105] Step (5), determining the total voltage as the voltage value of the heating circuit.

[0106] In Figure 3 , the sum of the voltages of each individual cell can be determined as the total voltage of the battery pack, and this total voltage can be used as the voltage of the heating circuit. It should be understood that if the battery pack also includes batteries connected in parallel, the total voltage of the battery pack must be determined based on the actual connection method of the batteries in the battery pack. It should also be understood that in this disclosure, the voltage of the current detection device 213 can be ignored; therefore, the total voltage of the battery pack can be used as the voltage of the heating circuit.

[0107] In one embodiment, the validity of the total voltage of the battery pack can also be detected. For example, the battery system can also include a voltage acquisition device connected to the battery pack for acquiring the voltage across the battery pack.

[0108] In this embodiment, obtaining the voltage value of the heating circuit further includes the following steps:

[0109] Step (6): obtaining the voltage across the battery pack through a voltage acquisition device.

[0110] Step (7), detecting the validity of the total voltage based on the voltages at both ends of the battery pack.

[0111] For example, a voltage deviation value between the voltage across the battery pack and the total voltage is determined, for example, the absolute value of the difference between the voltage across the battery pack and the total voltage is determined as the voltage deviation value. When the voltage deviation value is less than or equal to a preset voltage deviation threshold, the total voltage is determined to be valid.

[0112] Accordingly, the specific implementation method of the above step (5) is: when it is determined that the total voltage is valid, the total voltage is determined as the voltage value of the heating circuit.

[0113] By adopting the above technical solution, the voltage at both ends of the battery pack collected by the voltage collection device is used to detect the validity of the total voltage of the battery pack. When the voltage deviation value between the voltage at both ends of the battery pack and the total voltage is small, it is determined that the voltage of each single battery collected by the BMS is accurate, that is, the determined voltage value of the heating circuit is accurate. In this way, the actual current value of the heating circuit can be accurately calculated based on the voltage value of the heating circuit, further improving the accuracy of the validity detection of the first current sampling value.

[0114] According to the above method, the voltage value and the effective resistance value of the heating circuit are obtained, and then the ratio of the voltage value to the effective resistance value is determined as the actual current value of the heating circuit.

[0115] For example, Figure 4 is a schematic diagram illustrating a current validity detection method according to an exemplary embodiment. As shown in Figure 4, the BMS may include a total voltage determination module, a resistance determination module, a current actual value determination module, a current sampling value determination module, and a validity detection module.

[0116] Among them, the total voltage determination module is used to obtain the voltage of the single cell and determine the voltage value of the heating circuit based on the voltage of the single cell; the resistance determination module is connected to the temperature sensor and stores the correspondence between the pre-calibrated temperature value and the resistance value, obtains the temperature of the heating device from the temperature sensor, and determines the effective resistance value of the heating circuit based on the temperature of the heating device and the above correspondence; the current actual value determination module is connected to the total voltage determination module and the resistance determination module, and is used to obtain the voltage value of the heating circuit and the effective resistance value of the heating circuit, and calculate the actual current value of the heating circuit based on the voltage value and the effective resistance value; the current sampling value determination module is connected to the current detection device, and is used to obtain a first current sampling value from the current detection device, or to obtain a current signal from the current detection device and analyze the current signal to obtain the first current sampling value; the validity detection module is connected to the current actual value determination module and the current sampling value determination module, and is used to obtain the current actual value and the first current sampling value, and at least detect the validity of the first current sampling value based on the current actual value to obtain a detection result.

[0117] Fig. 5 is a flow chart showing a method for detecting the validity of a first current sampling value according to an exemplary embodiment. As shown in Fig. 5 , step S103 in Fig. 1 may further include the following steps.

[0118] In step S1031 , the load terminal status of the battery system is obtained.

[0119] In actual applications, a load is connected between the positive and negative terminals of the battery system. This load can be an electrical accessory on the vehicle, such as a PTC heater, air conditioner, or DC-DC converter. It should be understood that the load terminal state refers to the overall state of the electrical accessories. For example, a load terminal state of "on" means that current is flowing through the load terminal, meaning that at least one electrical accessory is conducting and functioning properly. A load terminal state of "off" means that no current is flowing through the load terminal, meaning that each electrical accessory is off and functioning properly.

[0120] In step 1032, a current reference value is determined according to the load terminal state and the actual current value.

[0121] It should be understood that the first current sampling value is the total current output by the battery pack. When the load terminal is in a conductive state, the total current output by the battery pack flows into the heating circuit and the load terminal respectively. Therefore, when the load terminal is in a conductive state, it is necessary to further obtain the load terminal current value, and determine the sum of the actual current value and the load terminal current value as the current reference value. When the load terminal is in a non-conductive state, the total current output by the battery pack flows entirely into the heating circuit. Therefore, when the load terminal is in a non-conductive state, the actual current value is determined as the current reference value.

[0122] In step 1033 , the validity of the first current sampling value is detected according to the current reference value to obtain a detection result.

[0123] For example, a current deviation value between a current reference value and a first current sampling value is determined. The absolute value of the difference between the current reference value and the first current sampling value is determined as the current deviation value. The current deviation value is then compared with a preset current deviation threshold. If the current deviation value is greater than the current deviation threshold, the first current sampling value is determined to be invalid. If the current deviation value is less than or equal to the current deviation threshold, the first current sampling value is determined to be valid.

[0124] The current deviation threshold is set based on the voltage sampling accuracy of the single cell, the sampling accuracy of the current detection device, and the error when determining the effective resistance value.

[0125] It should be understood that the first current sampling value can be determined to be valid when it is detected that the current deviation value is less than or equal to the current deviation threshold, or the first current sampling value can be determined to be valid when the number of times the current deviation value is less than or equal to the current deviation threshold is greater than or equal to the preset number of times within a preset time period, or the first current sampling value can be determined to be valid when all current deviation values ​​are less than or equal to the current deviation threshold within the preset time period. The present disclosure does not make specific limitations on this.

[0126] When the detection result indicates that the first current sampling value is invalid, the current validity detection method provided by the present disclosure may further include:

[0127] Controlling the battery pack to switch to a non-conducting state after a preset time; and / or

[0128] A first invalid prompt message is sent to the vehicle controller, where the first invalid prompt message is used to prompt the vehicle controller that the first current sampling value of the battery pack is invalid.

[0129] For example, as shown in FIG4 , the BMS may further include a fault processing module, which is connected to the validity detection module. When the validity processing module determines that the first current sampling value is invalid in the manner described in FIG4 , the validity processing module sends the detection result to the fault processing module. The fault processing module controls the battery pack to switch to a non-conducting state after a preset time according to the detection result. The preset time can be the time required to control the power-off of the electrical accessories, the time required to pull over the vehicle, or the time it takes for the vehicle to drive to the nearest repair shop, etc., and the present disclosure does not make specific limitations on this.

[0130] The fault handling module may report the first invalid prompt information to the vehicle controller via the CAN bus.

[0131] In addition, when the validity processing module determines that the first current sampling value is invalid, it can also control the state of charge calculation module to calculate the state of charge of the battery pack according to the first current sampling value and a preset ratio.

[0132] In one embodiment, the current validity detection method may further include:

[0133] When the battery pack is in a non-conducting state, obtaining a second current sampling value of the battery pack;

[0134] If the second current sampling value is greater than the zero-drift error threshold, it is determined that the second current sampling value is invalid.

[0135] In this embodiment, the second current sampling value and the first current sampling value refer to current values ​​of the battery pack collected under different states of the battery pack, that is, output current sampling values ​​of the battery pack under different states of the battery pack.

[0136] With the above technical solution, when the battery pack is not conducting, the validity of the second current sampling value can also be detected based on the zero drift error threshold, thereby further improving the accuracy of the validity detection of the current sampling value of the battery pack.

[0137] Optionally, when it is determined that the second current sampling value is invalid, the current validity detection method further includes:

[0138] Sending a second invalid prompt message to the vehicle controller, where the second invalid prompt message is used to prompt the vehicle controller that the second current sampling value of the battery pack is invalid; and / or

[0139] Do not switch the battery pack into the on state.

[0140] Similarly, when the validity processing module determines that the second current sampling value is invalid, it sends the detection result to the fault processing module. Based on the detection result, the fault processing module sends a second invalid prompt message to the vehicle controller via the CAN bus and / or prohibits switching the battery pack to the conductive state.

[0141] In this way, when it is detected that the second current sampling value is invalid, the battery pack is prohibited from being switched to the on state, thereby further improving the safety of the vehicle.

[0142] The present disclosure also provides a power supply system, comprising: a battery system and a management device; the battery system comprises a battery pack and a heating circuit connected in parallel, the heating circuit being used to heat the battery pack; the management device is connected to the battery pack and the heating circuit respectively;

[0143] The management device is used to: when the battery pack is in a conductive state and the heating circuit heats the battery pack, obtain the voltage value, effective resistance value and first current sampling value of the heating circuit, wherein the first current sampling value is the output current sampling value of the battery pack; determine the actual current value of the heating circuit based on the voltage value and effective resistance value of the heating circuit; and detect the validity of the first current sampling value at least based on the actual current value to obtain a detection result.

[0144] Optionally, the heating circuit includes a heating device;

[0145] The management device is used to: obtain the temperature value of the heating device;

[0146] According to the corresponding relationship between the preset temperature value and the resistance value, the resistance value corresponding to the temperature value is determined, and the resistance value is determined as the effective resistance value of the heating circuit.

[0147] Optionally, the heating circuit includes a contactor, which is connected in series with the heating device;

[0148] The management device is further configured to: in response to a request to detect the validity of the first current sampling value of the battery pack, control the contactor to close so as to heat the battery pack through the heating device.

[0149] Optionally, the management device includes a battery management system BMS.

[0150] The present disclosure also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the current validity detection method provided by the present disclosure are implemented.

[0151] The present disclosure also provides an electric device, including: a battery system, the battery system including a battery pack and a heating circuit, the battery pack and the heating circuit are connected in parallel, and the heating circuit is used to heat the battery pack; a memory on which a computer program is stored; and a processor for executing the computer program in the memory to implement the steps of the current validity detection method provided in the present disclosure.

[0152] For example, the electric device may be an electric vehicle, an aircraft, a ship, or other devices including a battery system.

[0153] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0154] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0155] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A current validity detection method applied to a battery system, characterized in that: The battery system comprises a battery pack (211) and a heating circuit (212) connected in parallel, and the method comprises: When the battery pack (211) is in a conducting state and the heating circuit (212) heats the battery pack (211), a voltage value and an effective resistance value of the heating circuit (212) and a first current sampling value (S101) of the battery pack (211) are obtained, wherein the first current sampling value is an output current sampling value of the battery pack (211); Determining an actual current value (S102) of the heating circuit (212) according to the voltage value and the effective resistance value of the heating circuit (212); The validity of the first current sampling value is detected at least according to the current actual value to obtain a detection result (S103).

2. The method according to claim 1, characterized in that The heating circuit (212) is provided with a heating device (2121); obtaining the effective resistance value of the heating circuit (212) comprises: Obtaining the temperature value of the heating device (2121); According to the corresponding relationship between the preset temperature value and the resistance value, the resistance value corresponding to the temperature value is determined, and the resistance value is determined as the effective resistance value of the heating circuit (212).

3. The method according to claim 2, characterized in that A contactor is also provided in the heating circuit (212), and the contactor is connected in series with the heating device (2121); the method further comprises: In response to a request to detect the validity of a first current sampling value of the battery pack (211), the contactor is controlled to close so as to heat the battery pack (211) through the heating device (2121).

4. The method according to claim 1, characterized in that: Obtaining the voltage value of the heating circuit (212), comprising: Obtaining the voltage of each single cell in the battery pack (211); Determining the total voltage of the battery pack (211) according to the voltage of each single battery; The total voltage is determined as the voltage value of the heated circuit (212).

5. The method according to claim 4, characterized in that Obtaining the voltage value of the heating circuit (212), further comprising: Acquiring the voltage at both ends of the battery pack (211) by means of a voltage acquisition device; detecting the validity of the total voltage according to the voltages at both ends of the battery pack (211); Determining the total voltage as the voltage value of the heating circuit (212) comprises: When it is determined that the total voltage is valid, the total voltage is determined as the voltage value of the heating circuit (212).

6. The method according to claim 5, characterized in that The detecting the validity of the total voltage according to the voltages at both ends of the battery pack (211) comprises: Determining a voltage deviation value between the voltage at both ends of the battery group (211) and the total voltage; When the voltage deviation value is less than or equal to a preset voltage deviation threshold, it is determined that the total voltage is valid.

7. The method according to any one of claims 1 to 6, characterized in that The detecting the validity of the first current sampling value at least according to the current actual value to obtain a detection result includes: Acquiring a load terminal state of the battery system (S1031), wherein the load terminal state includes a conducting state and a non-conducting state; Determining a current reference value according to the load terminal state and the actual current value (S1032); The validity of the first current sampling value is detected according to the current reference value to obtain a detection result (S1033).

8. The method according to claim 7, characterized in that The detecting the validity of the first current sampling value according to the current reference value to obtain a detection result includes: Determining a current deviation value between the current reference value and the first current sampling value; When the current deviation value is greater than a current deviation threshold, determining that the first current sampling value is invalid; When the current deviation value is less than or equal to the current deviation threshold, it is determined that the first current sampling value is valid.

9. The method according to claim 7 or 8, characterized in that: The step of determining a current reference value according to the load terminal state and the actual current value includes: When the load terminal is in a non-conducting state, determining the actual current value as a current reference value; When the load terminal is in the on state, the load terminal current value is obtained, and the sum of the actual current value and the load terminal current value is determined is the current reference value.

10. The method according to any one of claims 1 to 9, characterized in that When the detection result indicates that the first current sampling value is invalid, the method further includes: Controlling the battery pack (211) to switch to a non-conducting state after a preset time period; and / or A first invalid prompt message is sent to a vehicle controller, wherein the first invalid prompt message is used to prompt the vehicle controller that a first current sampling value of the battery pack (211) is invalid.

11. The method according to any one of claims 1 to 10, characterized in that The method further comprises: When the battery pack (211) is in a non-conducting state, obtaining a second current sampling value of the battery pack (211); If the second current sampling value is greater than the zero drift error threshold, it is determined that the second current sampling value is invalid.

12. The method according to claim 11, characterized in that When it is determined that the second current sampling value is invalid, the method further includes: Sending a second invalid prompt message to a vehicle controller, wherein the second invalid prompt message is used to prompt the vehicle controller that the second current sampling value of the battery pack (211) is invalid; and / or Switching the battery pack (211) to a conducting state is prohibited.

13. The method according to any one of claims 1 to 12, characterized in that The battery pack (211) includes a plurality of batteries connected in series, or the battery pack (211) includes a plurality of branches connected in parallel, and each branch includes at least one battery.

14. A power supply system, characterized in that: The system comprises: a battery system and a management device (22); The battery system comprises a battery pack (211) and a heating circuit (212) connected in parallel, wherein the heating circuit (212) is used to heat the battery pack (211); The management device (22) is connected to the battery pack (211) and the heating circuit (212) respectively; The management device (22) is used to: when the battery pack (211) is in an on state and the heating circuit (212) heats the battery pack (211), obtain the voltage value and effective resistance value of the heating circuit (212) and the first current sampling value (S101) of the battery pack (211), wherein the first current sampling value is the output current sampling value of the battery pack (211); determine the actual current value (S102) of the heating circuit (212) based on the voltage value and the effective resistance value of the heating circuit (212); and detect the validity of the first current sampling value at least based on the actual current value to obtain a detection result (S103).

15. The power supply system according to claim 14, characterized in that: The heating circuit (212) comprises a heating device (2121); The management device (22) is used to: obtain the temperature value of the heating device (2121); According to the corresponding relationship between the preset temperature value and the resistance value, the resistance value corresponding to the temperature value is determined, and the resistance value is determined as the effective resistance value of the heating circuit (212).

16. The power supply system according to claim 15, characterized in that: The heating circuit (212) comprises a contactor, and the contactor is connected in series with the heating device (2121); The management device (22) is also used to: in response to a request to detect the validity of the first current sampling value of the battery pack (211), control the contactor to close, so as to heat the battery pack (211) through the heating device (2121).

17. The power supply system according to any one of claims 14 to 16, characterized in that: The management device (22) includes a battery management system BMS (221).

18. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 13 are implemented.

19. An electric device, characterized in that: include: A battery system, the battery system comprising a battery pack (211) and a heating circuit (212), the battery pack (211) and the heating circuit (212) being connected in parallel, the heating circuit (212) being used to heat the battery pack (211); a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 13.

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