Battery sampling chip and battery management system

Abstract

The application provides a battery sampling chip and a battery management system. The battery sampling chip comprises a selector module, a first data selector and a second data selector; the first data selector and the second data selector are both used for collecting state data of a first group of battery cells; an analog-to-digital conversion module is connected with the first data selector and the second data selector; and a data control module is used for sending an alarm information when the converted state data sent by the analog-to-digital conversion module is not received within a preset time length. Through the redundant design of the data selector, whether the selector module is invalid or abnormal can be effectively judged, and then the battery management system comprising the battery sampling chip can avoid monitoring the incorrect state data. Compared with the prior art, the battery sampling chip provided in the application embodiment improves the reliability of the battery sampling chip itself and enhances the safety of the battery management system.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery sampling chip and a battery management system. Background Technology

[0002] To ensure the safety and reliability of batteries in devices (such as new energy vehicles and drones), a battery management system (BMS) is needed to monitor battery status. The BMS collects voltage and temperature data from the battery using a battery sampling chip. The inventors discovered that current battery sampling chips, such as AFE (Analog Front End) chips, have low reliability. When an AFE chip fails or malfunctions, the collected data is often invalid. Existing technology cannot promptly identify this invalid data, leaving the BMS in a dangerous monitoring state. Summary of the Invention

[0003] The purpose of this application is to provide a battery sampling chip and a battery management system, so as to timely identify the situation where the data collected by the battery sampling chip is incorrect due to its own failure or abnormality, thereby ensuring the safe monitoring of the battery management system.

[0004] This invention is implemented as follows:

[0005] In a first aspect, embodiments of this application provide a battery sampling chip, comprising: a selector module, including: a first data selector and a second data selector; both the first data selector and the second data selector are used to collect state data of a first group of battery cells; an analog-to-digital conversion module, connected to the first data selector and the second data selector, the analog-to-digital conversion module being used to send a first abnormal feedback instruction to the first data selector and the second data selector when the state data of the first group of battery cells collected by the first data selector and the second data selector are different, and to perform analog-to-digital conversion on the state data of the first group of battery cells when the state data of the first group of battery cells collected by the first data selector and the second data selector are the same; and a data control module, connected to the analog-to-digital conversion module, the data control module being used to receive the converted state data sent by the analog-to-digital conversion module, and to issue an alarm message when the converted state data sent by the analog-to-digital conversion module is not received within a preset time period.

[0006] In this embodiment, the selector module in the battery sampling chip includes two data selectors, both used to collect state data of the first group of battery cells. When the state data of the first group of battery cells collected by the two data selectors are inconsistent, it indicates that the selector module has failed or is abnormal, and erroneous sampling data will not be output. Therefore, through the redundant design of the data selectors, it is possible to effectively determine whether the selector module has failed or is abnormal, thereby preventing the battery management system, including the battery sampling chip, from monitoring erroneous state data. Compared with the prior art, the battery sampling chip provided in this embodiment improves its own reliability while enhancing the security of the battery management system.

[0007] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the selector module further includes a third data selector and a fourth data selector; both the third data selector and the fourth data selector are used to collect the status data of the second group of battery cells; wherein, the first group of battery cells and the second group of battery cells include an identical first battery cell; the first group of battery cells and the second group of battery cells belong to the same device; the analog-to-digital conversion module is also connected to the third data selector and the fourth data selector, and the analog-to-digital conversion module is further used to collect the status data of the second group of battery cells collected by the third data selector and the fourth data selector respectively. When the status data are different, a second abnormal feedback instruction is sent to the third data selector and the fourth data selector; when the status data of the first cell collected by the first data selector, the second data selector, the third data selector and the fourth data selector are different, a third abnormal feedback instruction is sent to the first data selector, the second data selector, the third data selector and the fourth data selector; and when the status data of the second group of cells collected by the third data selector and the fourth data selector are the same, the status data of the second group of cells is converted from analog to digital.

[0008] In this embodiment, the selector module further includes a third data selector and a fourth data selector. Both the third and fourth data selectors are used to collect status data of the second group of battery cells, and the first and second groups of battery cells include an identical first battery cell. By using an identical first battery cell, cross-validation of the status data collected by the first, second, third, and fourth data selectors can be achieved. This effectively verifies whether the first and second data selectors fail simultaneously, or whether the third and fourth data selectors fail simultaneously. Therefore, when one group of data selectors fails, abnormal sampling data will not be output, further improving the reliability of the battery sampling chip.

[0009] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the analog-to-digital conversion module includes a first analog-to-digital conversion unit, a second analog-to-digital conversion unit, and a sampling data comparison unit; the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are two analog-to-digital conversion units with different precisions; both the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are connected to the first data selector, the second data selector, and the sampling data comparison unit; the sampling data comparison unit is also connected to the data control module; both the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are used to perform analog-to-digital conversion on the status data of the first group of battery cells; the sampling data comparison unit is used to obtain the digital quantities converted by the first analog-to-digital conversion unit and the second analog-to-digital conversion unit, and convert the two digital quantities into digital quantities at a first precision respectively; when the two digital quantities at the first precision are the same, the digital quantity at the first precision is sent to the data control module; wherein, the digital quantity at the first precision is the converted status data; when the two digital quantities at the first precision are different, the data control module is triggered to alarm.

[0010] In this embodiment, the analog-to-digital conversion module also adopts a redundant design, and the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are two analog-to-digital conversion units with different precisions. This method can effectively avoid abnormal data output during the conversion process due to common mode failure of the analog-to-digital conversion units.

[0011] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the first analog-to-digital conversion unit is an 11-bit analog-to-digital conversion unit, and the second analog-to-digital conversion unit is a 16-bit analog-to-digital conversion unit.

[0012] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the sampling data comparison unit is further used to lock the faulty analog-to-digital conversion unit when the two digital quantities under the first precision are not the same; wherein, the faulty analog-to-digital conversion unit is the analog-to-digital conversion unit corresponding to the digital quantity with the larger difference from the preset quantity among the two digital quantities under the first precision.

[0013] In this embodiment, when the two digital values ​​at the first precision are different, the sampling data comparison unit can also identify the faulty analog-to-digital conversion unit, so that subsequent maintenance personnel can directly carry out maintenance, saving maintenance personnel's fault detection time.

[0014] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the battery sampling chip further includes a reference voltage calibration module; the reference voltage calibration module is connected to the analog-to-digital conversion module and the data control module respectively; the reference voltage calibration module is used to collect the power supply voltage of the battery sampling chip and the power supply voltage of the analog-to-digital conversion module; and to compare the power supply voltage of the battery sampling chip with the power supply voltage of the analog-to-digital conversion module, and when the comparison result is inconsistent, trigger an alarm in the data control module.

[0015] In this embodiment, the battery sampling chip also includes a reference voltage calibration module, which is connected to the analog-to-digital conversion module. The reference voltage calibration module can effectively identify whether the power supply voltage of the analog-to-digital conversion module is abnormal, thereby avoiding the situation where the sampling accuracy of the battery sampling chip is inaccurate due to environmental interference, and further improving the reliability of the battery sampling chip.

[0016] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the reference voltage calibration module is also connected to the selector module. The reference voltage calibration module is also used to collect the power supply voltage of the selector module and compare the power supply voltage of the battery sampling chip with the power supply voltage of the selector module. When the comparison result is inconsistent, the data control module is triggered to alarm.

[0017] In this embodiment, the reference voltage calibration module is also connected to the selector module. The reference voltage calibration module can effectively identify whether the power supply voltage of the selector module is abnormal, thereby avoiding the situation where the sampling accuracy of the battery sampling chip is inaccurate due to environmental interference, and further improving the reliability of the battery sampling chip.

[0018] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the battery sampling chip further includes a sleep detection module; the sleep detection module is connected to the analog-to-digital conversion module and the data control module respectively, and the sleep detection module is used to compare the converted status data transmitted by the analog-to-digital conversion module with a preset value when the device connected to the battery sampling chip is in a sleep state; if the comparison result is inconsistent, the data control module is triggered to alarm.

[0019] In this embodiment, the battery sampling chip also integrates a sleep detection module. Compared with the prior art which places the sleep detection module in the controller of the battery management system, this can save space resources and energy consumption of the controller.

[0020] In conjunction with the technical solution provided in the first aspect above, in some possible implementations, the status data includes voltage data and / or temperature data.

[0021] Secondly, embodiments of this application provide a battery management system, including a controller and a battery sampling chip as described in the first aspect above; the controller is connected to the data control module of the battery sampling chip, and the controller is used to acquire battery status data collected by the battery sampling chip. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a block diagram of a first type of battery sampling chip provided in an embodiment of this application.

[0024] Figure 2 This is a block diagram of a second type of battery sampling chip provided in an embodiment of this application.

[0025] Figure 3 This is a block diagram of a third type of battery sampling chip provided in an embodiment of this application.

[0026] Figure 4 This is a block diagram of a fourth type of battery sampling chip provided in an embodiment of this application.

[0027] Figure 5 This is a block diagram of a battery management system provided in an embodiment of this application.

[0028] Icons: 100-Battery sampling chip; 10-Selector module; 11-First data selector; 12-Second data selector; 13-Third data selector; 14-Fourth data selector; 20-Analog-to-digital conversion module; 21-First analog-to-digital conversion unit; 22-Second analog-to-digital conversion unit; 23-Sampling data comparison unit; 30-Data control module; 40-Reference voltage calibration module; 50-Sleep detection module; 200-Battery management system; 300-Controller. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0030] Please see Figure 1This application provides a battery sampling chip 100, including a selector module 10, an analog-to-digital converter module 20, and a data control module 30. The analog-to-digital converter module 20 is connected to both the selector module 10 and the data control module 30.

[0031] The selector module 10 is mainly used to collect the state data of the battery, which includes multiple cells. In this embodiment, the selector module 10 includes a first data selector 11 and a second data selector 12. The first data selector 11 and the second data selector 12 are connected. Both the first data selector 11 and the second data selector 12 are used to collect the state data of a first group of cells. The first group of cells can refer to all the cells in the battery or a portion of the cells in the battery. When the first group of cells is a portion of the cells in the battery, the selector module 10 also includes more data selectors to sample other cells.

[0032] It should be noted that a data selector (multiplexer, mux) is a combinational logic circuit with multiple inputs and a single output. Therefore, one data selector can sample multiple battery cells simultaneously. For example, if the first group of battery cells includes eight cells, then the first data selector 11 and the second data selector 12 can simultaneously acquire the status data of these eight cells.

[0033] Optionally, the cell status data can be the cell voltage data or the cell temperature data. Of course, the battery sampling chip 100 can also sample the cell voltage data and the cell temperature data at the same time. This application does not limit this.

[0034] The analog-to-digital converter (ADC) module 20 is mainly used for converting analog signals to digital signals. The ADC module 20 is connected to the first data selector 11 and the second data selector 12. In this embodiment, the ADC module 20 is used to send a first abnormality feedback command to the first data selector 11 and the second data selector 12 when the state data of the first group of battery cells collected by the first data selector 11 and the second data selector 12 are different. And when the state data of the first group of battery cells collected by the first data selector 11 and the second data selector 12 are the same, the ADC module 20 performs analog-to-digital conversion on the state data of the first group of battery cells.

[0035] For example, both the first data selector 11 and the second data selector 12 are used to collect status data of cells 1 through 8. When the analog-to-digital conversion module 20 receives different status data of cells 1 through 8 collected by the two selectors, it indicates that the selector module 10 has failed or is abnormal. At this time, no analog-to-digital conversion is performed on the collected status data (i.e., no erroneous sampled data is output), but a first abnormal feedback command is sent to the first data selector 11 and the second data selector 12. When the analog-to-digital conversion module 20 receives the same status data of cells 1 through 8 collected by the two selectors, it indicates that the selector module 10 is in normal working condition. At this time, the status data of the first group of cells is converted to analog-to-digital data. When the status data is the same, it can be set to perform analog-to-digital conversion based on the status data collected by any one of the data selectors. For example, it can be set to perform analog-to-digital conversion based on the status data of the first group of cells collected by the first data selector 11.

[0036] It should be noted that the determination of whether the state data is the same can be made using a preset comparison threshold. For example, if the difference between the state data collected by the first data selector 11 and the second data selector 12 is less than the preset comparison threshold, it indicates that the state data collected by the two are the same; if the difference between the state data collected by the first data selector 11 and the second data selector 12 is greater than the preset comparison threshold, it indicates that the state data collected by the two are not the same. The specific value of the preset comparison threshold can be determined according to the actual situation, and no limit is imposed on the value here.

[0037] The data control module 30 is connected to the analog-to-digital conversion module 20. The data control module 30 is used to receive the converted status data sent by the analog-to-digital conversion module 20, and to issue an alarm message when it does not receive the converted status data sent by the analog-to-digital conversion module 20 within a preset time period.

[0038] In other words, the data control module 30 includes two data control modes. The first mode is when the analog-to-digital converter module 20 does not detect an anomaly in the selector module 10. In this mode, the data control module 30 can receive the converted status data sent by the analog-to-digital converter module 20, so that the data control module 30 can subsequently output the converted status data to the controller of the battery management system connected to the battery sampling chip 100. The data control module 30 may include a data register unit to store the converted status data. However, if the data control module 30 does not receive the converted status data sent by the analog-to-digital converter module 20 within a preset time period, it indicates that the data acquisition was interrupted at the analog-to-digital converter module 20, meaning the status data acquired by the selector module 10 is incorrect. In this case, the data control module 30 issues an alarm message. The specific value of the preset time period is determined according to the actual situation and is not limited here.

[0039] In summary, in this embodiment, the selector module 10 in the battery sampling chip 100 includes two data selectors, both used to collect state data of the first group of battery cells. When the state data of the first group of battery cells collected by the two data selectors are inconsistent, it indicates that the selector module has failed or is abnormal, and erroneous sampling data will not be output. Therefore, through the redundant design of the data selectors, it is possible to effectively determine whether the selector module 10 has failed or is abnormal, thereby preventing the battery management system, including the battery sampling chip 100, from monitoring erroneous state data. Compared with the prior art, the battery sampling chip 100 provided in this embodiment improves its own reliability while enhancing the security of the battery management system.

[0040] Please see Figure 2 Optionally, the selector module 10 further includes a third data selector 13 and a fourth data selector 14. The third data selector 13 and the fourth data selector 14 are connected, and are also connected to the first data selector 11 and the second data selector 12; that is, all four data selectors are interconnected. Both the third data selector 13 and the fourth data selector 14 are used to collect the status data of the second group of battery cells.

[0041] The first group of battery cells and the second group of battery cells both include an identical first battery cell; the first group of battery cells and the second group of battery cells belong to the same equipment.

[0042] For example, both the first and second groups of battery cells belong to the same new energy vehicle. This new energy vehicle includes sixteen battery cells, which are numbered sequentially from cell number one to cell number sixteen. The first group of battery cells consists of cells number one to ten, and the second group consists of cells number ten to sixteen. Among them, cell number ten is the first battery cell, and the first data selector 11, the second data selector 12, the third data selector 13, and the fourth data selector 14 will all collect the status data of cell number ten.

[0043] The analog-to-digital conversion module 20 is also connected to the third data selector 13 and the fourth data selector 14. The module 20 is further configured to: send a second abnormality feedback command to the third data selector 13 and the fourth data selector 14 when the state data of the second group of battery cells collected by the third data selector 13 and the fourth data selector 14 are different; send a third abnormality feedback command to the first data selector 11, the second data selector 12, the third data selector 13, and the fourth data selector 14 when the state data of the first group of battery cells collected by the first data selector 11, the second data selector 12, the third data selector 13, and the fourth data selector 14 are different; and perform analog-to-digital conversion on the state data of the second group of battery cells when the state data of the second group of battery cells collected by the third data selector 13 and the fourth data selector 14 are the same.

[0044] When the selector module 10 simultaneously includes a first data selector 11, a second data selector 12, a third data selector 13, and a fourth data selector 14, the analog-to-digital conversion module 20 can handle four scenarios: The first scenario is when the state data of the first group of battery cells collected by the first data selector 11 and the second data selector 12 are the same, the state data of the second group of battery cells collected by the third data selector 13 and the fourth data selector 14 are the same, and the state data of the first group of battery cells collected by the first data selector 11, the second data selector 12, the third data selector 13, and the fourth data selector 14 are also the same; in this case, the analog-to-digital conversion module 20 performs analog-to-digital conversion on the state data of the first group of battery cells and the state data of the second group of battery cells respectively. The second scenario is when the state data of the first group of battery cells collected by the first data selector 11 and the second data selector 12 are different, and the state data of the second group of battery cells collected by the third data selector 13 and the fourth data selector 14 are the same; in this case, the analog-to-digital conversion module 20 sends a first abnormal feedback instruction to the first data selector 11 and the second data selector 12. The third scenario occurs when the status data of the first group of battery cells collected by the first data selector 11 and the second data selector 12 are the same, but the status data of the second group of battery cells collected by the third data selector 13 and the fourth data selector 14 are different. In this case, the analog-to-digital conversion module 20 sends a second abnormality feedback command to the third data selector 13 and the fourth data selector 14. The fourth scenario occurs when the status data of the first battery cells collected by the first data selector 11, the second data selector 12, the third data selector 13, and the fourth data selector 14 are different. In this case, a third abnormality feedback command is sent to each of these four data selectors. It should be noted that the fourth scenario primarily determines whether the status data of the first battery cells collected by the first data selector 11 and the second data selector 12 are the same as the status data of the first battery cells collected by the third data selector 13 and the fourth data selector 14.

[0045] As can be seen, since the selector module 10 in this embodiment further includes a third data selector 13 and a fourth data selector 14, both of which are used to collect the status data of the second group of battery cells, and the first and second groups of battery cells include an identical first battery cell. Through this identical first battery cell, cross-validation of the status data collected by the first data selector 11, the second data selector 12, the third data selector 13, and the fourth data selector 14 can be achieved. This effectively verifies whether the first data selector 11 and the second data selector 12 fail simultaneously, or whether the third data selector 13 and the fourth data selector 14 fail simultaneously. Therefore, when one set of data selectors fails, abnormal sampling data will not be output, further improving the reliability of the battery sampling chip.

[0046] It should be noted that the selector module 10 can also integrate more data selectors to adapt to more battery cells. The number of battery cells collected by each data selector can also be determined according to the actual situation, and this application does not limit it.

[0047] Please see Figure 3 Optionally, the analog-to-digital conversion module 20 includes a first analog-to-digital conversion unit 21, a second analog-to-digital conversion unit 22, and a sampled data comparison unit 23.

[0048] The first analog-to-digital converter (ADC) unit 21 and the second ADC unit 22 are two ADC units with different precisions. Both the first ADC unit 21 and the second ADC unit 22 are connected to the first data selector 11, the second data selector 12, and the sampled data comparison unit 23. The sampled data comparison unit 23 is also connected to the data control module 30.

[0049] Both the first analog-to-digital conversion unit 21 and the second analog-to-digital conversion unit 22 are used to convert the status data of the first group of battery cells from analog to digital. The sampling data comparison unit 23 is used to obtain the digital values ​​converted by the first analog-to-digital conversion unit 21 and the second analog-to-digital conversion unit 22, and convert the two digital values ​​into digital values ​​at a first precision. When the two digital values ​​at the first precision are the same, the digital values ​​at the first precision are sent to the data control module 30. At this time, the digital values ​​at the first precision are the converted status data received by the data control module 30. When the two digital values ​​at the first precision are different, the data control module 30 is triggered to alarm.

[0050] For example, the first analog-to-digital conversion unit 21 performs analog-to-digital conversion on the status data of the first group of battery cells to obtain digital quantity A, and the second analog-to-digital conversion unit 22 performs analog-to-digital conversion on the status data of the first group of battery cells to obtain digital quantity B. After receiving digital quantities A and B, the sampling data comparison unit 23 converts them into digital quantities of the same precision (first precision). For example, the sampling data comparison unit 23 converts digital quantity A into digital quantity C1 of the first precision, and the sampling data comparison unit 23 converts digital quantity B into digital quantity C2 of the first precision. When the two digital quantities C1 and C2 of the first precision are the same, it indicates that there is no error or abnormality in the conversion data of the two analog-to-digital conversion units, and the same digital quantity of the first precision is sent to the data control module 30. When the two digital quantities C1 and C2 of the first precision are different, it indicates that there is an abnormality or error in the conversion data of the two analog-to-digital conversion units, and the data control module 30 is directly triggered to alarm.

[0051] It should be noted that when the two digital quantities C1 and C2 under the first precision are not the same, it may be that the first analog-to-digital conversion unit 21 is malfunctioning, the second analog-to-digital conversion unit 22 is malfunctioning, or both the first analog-to-digital conversion unit 21 and the second analog-to-digital conversion unit 22 are malfunctioning.

[0052] In the embodiments of this application, the first analog-to-digital conversion unit 21 is an 11-bit analog-to-digital conversion unit, and the second analog-to-digital conversion unit 22 is a 16-bit analog-to-digital conversion unit. The aforementioned first precision may refer to 12 bits, 11 bits, or 16 bits. Furthermore, the first analog-to-digital conversion unit 21 or the second analog-to-digital conversion unit 22 may also be a 12-bit analog-to-digital conversion unit; this application does not limit this.

[0053] As can be seen, in this embodiment, the analog-to-digital conversion module 20 also adopts a redundant design, and the first analog-to-digital conversion unit 21 and the second analog-to-digital conversion unit 22 are two analog-to-digital conversion units with different accuracies. This method can effectively avoid abnormal data output during the conversion process due to common mode failure of the analog-to-digital conversion units.

[0054] When the two digital quantities at the first precision are different, in order to facilitate subsequent maintenance personnel to directly carry out maintenance and save the fault detection time, the sampling data comparison unit 23 is also used to lock the faulty analog-to-digital conversion unit when the two digital quantities at the first precision are different. The faulty analog-to-digital conversion unit is the analog-to-digital conversion unit corresponding to the digital quantity with the larger difference from the preset quantity among the two digital quantities at the first precision.

[0055] The preset quantity is the digital quantity with the first precision corresponding to the normal state data. For example, when the state data is voltage data, the preset quantity is the digital quantity with the first precision corresponding to the normal voltage data; and when the state data is temperature data, the preset quantity is the digital quantity with the first precision corresponding to the normal temperature data.

[0056] Furthermore, when the selector module 10 also includes a third data selector 13 and a fourth data selector 14, the first analog-to-digital conversion unit 21 and the second analog-to-digital conversion unit 22 are both connected to the third data selector 13 and the fourth data selector 14. The specific conversion process and sampling data comparison process can be referred to the aforementioned process of analog-to-digital conversion and data comparison of the state data of the first group of battery cells, and will not be repeated here.

[0057] Please see Figure 4 Optionally, the battery sampling chip 100 also includes a reference voltage calibration module 40.

[0058] The reference voltage calibration module 40 is connected to both the analog-to-digital converter module 20 and the data control module 30. The reference voltage calibration module 40 is used to acquire the power supply voltage of the battery sampling chip 100 and the analog-to-digital converter module 20; and to compare the power supply voltage of the battery sampling chip 100 with that of the analog-to-digital converter module 20. If the comparison results are inconsistent, an alarm is triggered in the data control module 30. The reference voltage calibration module 40 can effectively identify whether the power supply voltage of the analog-to-digital converter module 20 is abnormal, thereby avoiding inaccurate sampling accuracy of the battery sampling chip 100 due to environmental interference, and further improving the reliability of the battery sampling chip 100.

[0059] In another embodiment, the reference voltage calibration module 40 is also connected to the selector module 10.

[0060] The reference voltage calibration module 40 is also used to acquire the power supply voltage of the selector module 10 and compare the power supply voltage of the battery sampling chip 100 with the power supply voltage of the selector module 10. When the comparison results are inconsistent, the data control module 30 is triggered to sound an alarm. The reference voltage calibration module 40 can effectively identify whether the power supply voltage of the selector module 10 is abnormal, thereby avoiding inaccurate sampling accuracy of the battery sampling chip 100 due to environmental interference, and further improving the reliability of the battery sampling chip 100.

[0061] Optionally, the battery sampling chip 100 also includes a sleep detection module 50. The sleep detection module 50 is connected to the analog-to-digital conversion module 20 and the data control module 30, respectively.

[0062] The sleep detection module 50 is used to compare the converted status data transmitted by the analog-to-digital converter 20 with a preset value when the device connected to the battery sampling chip is in sleep mode. If the comparison result is inconsistent, the data control module 30 is triggered to alarm.

[0063] It should be noted that the above preset values ​​are the digital values ​​corresponding to the status data during normal sleep mode. For example, when the status data is voltage data, the preset value is the digital value corresponding to the voltage data during normal sleep mode; and when the status data is temperature data, the preset value is the digital value corresponding to the temperature data during normal sleep mode.

[0064] In this embodiment, the sleep detection module 50 is also integrated into the battery sampling chip 100. Compared with the prior art, which places the sleep detection module 50 in the controller of the battery management system, it can save space resources and energy consumption of the controller.

[0065] Please see Figure 5 Based on the same inventive concept, this application also provides a battery management system 200. The battery management system 200 includes a controller 300 and the battery sampling chip 100 provided in the above embodiments.

[0066] The controller 300 is connected to the data control module 30 of the battery sampling chip 100, and the controller 300 is used to acquire the battery status data collected by the battery sampling chip 100.

[0067] When the battery includes a first group of cells, the controller 300 acquires the status data of the first group of cells collected by the battery sampling chip 100. When the battery includes a first group of cells and a second group of cells, the controller 300 acquires the status data of the first group of cells and the second group of cells collected by the battery sampling chip 100.

[0068] The controller 300 can be an integrated circuit chip with signal processing capabilities. The controller 300 can also be a general-purpose processor, such as a microcontroller unit (MCU), central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), discrete gate or transistor logic device, or discrete hardware component, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. Furthermore, the general-purpose processor can be a microprocessor or any conventional processor.

[0069] The battery management system 200 can be installed in any electrical device containing a battery, such as a new energy vehicle, a drone, or a terminal device; this application does not limit its application. For example, when the battery management system 200 is installed in a new energy vehicle, it becomes a BMS (Battery Management System). Through an improved battery sampling chip, the new energy vehicle can achieve the performance index ASIL (Automotive Safety Integration Level)-D. It should be noted that ASIL is divided into four levels: A, B, C, and D, with ASIL-D being the highest and ASIL-A the lowest.

[0070] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0071] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery sampling chip, characterized in that, include: The selector module includes: a first data selector and a second data selector; both the first data selector and the second data selector are used to collect the status data of the first group of battery cells; An analog-to-digital conversion module is connected to the first data selector and the second data selector. The analog-to-digital conversion module is used to send a first abnormal feedback instruction to the first data selector and the second data selector when the state data of the first group of cells collected by the first data selector and the second data selector are different, and to perform analog-to-digital conversion on the state data of the first group of cells when the state data of the first group of cells collected by the first data selector and the second data selector are the same. A data control module is connected to the analog-to-digital conversion module. The data control module is used to receive the converted status data sent by the analog-to-digital conversion module, and to issue an alarm message when it does not receive the converted status data sent by the analog-to-digital conversion module within a preset time period.

2. The battery sampling chip according to claim 1, characterized in that, The selector module further includes a third data selector and a fourth data selector; Both the third and fourth data selectors are used to collect status data of the second group of battery cells; wherein, the first group of battery cells and the second group of battery cells include an identical first battery cell; the first group of battery cells and the second group of battery cells belong to the same device; The analog-to-digital conversion module is also connected to the third data selector and the fourth data selector. The module is further configured to: send a second abnormality feedback instruction to the third data selector and the fourth data selector when the state data of the second group of cells collected by the third data selector and the fourth data selector are different; send a third abnormality feedback instruction to the first data selector, the second data selector, the third data selector, and the fourth data selector when the state data of the first group of cells collected by the first data selector, the second data selector, the third data selector, and the fourth data selector are different; and perform analog-to-digital conversion on the state data of the second group of cells when the state data of the second group of cells collected by the third data selector and the fourth data selector are the same.

3. The battery sampling chip according to claim 1, characterized in that, The analog-to-digital conversion module includes a first analog-to-digital conversion unit, a second analog-to-digital conversion unit, and a sampled data comparison unit; The first analog-to-digital conversion unit and the second analog-to-digital conversion unit are two analog-to-digital conversion units with different precisions; both the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are connected to the first data selector, the second data selector, and the sampled data comparison unit; the sampled data comparison unit is also connected to the data control module; Both the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are used to perform analog-to-digital conversion on the status data of the first group of battery cells; The sampling data comparison unit is used to obtain the digital quantities converted by the first analog-to-digital conversion unit and the second analog-to-digital conversion unit, and convert the two digital quantities into digital quantities with a first precision respectively; when the two digital quantities with the first precision are the same, the digital quantity with the first precision is sent to the data control module; wherein, the digital quantity with the first precision is the converted status data; when the two digital quantities with the first precision are different, the data control module is triggered to alarm.

4. The battery sampling chip according to claim 3, characterized in that, The first analog-to-digital conversion unit is an 11-bit analog-to-digital conversion unit, and the second analog-to-digital conversion unit is a 16-bit analog-to-digital conversion unit.

5. The battery sampling chip according to claim 3, characterized in that, The sampling data comparison unit is also used to lock the faulty analog-to-digital conversion unit when the two digital quantities under the first precision are not the same; wherein, the faulty analog-to-digital conversion unit is the analog-to-digital conversion unit corresponding to the digital quantity with the larger difference from the preset quantity among the two digital quantities under the first precision.

6. The battery sampling chip according to any one of claims 1 to 5, characterized in that, The battery sampling chip also includes a reference voltage calibration module; the reference voltage calibration module is connected to the analog-to-digital conversion module and the data control module respectively. The reference voltage calibration module is used to collect the power supply voltage of the battery sampling chip and the power supply voltage of the analog-to-digital conversion module; and to compare the power supply voltage of the battery sampling chip with the power supply voltage of the analog-to-digital conversion module. When the comparison results are inconsistent, the data control module is triggered to alarm.

7. The battery sampling chip according to claim 6, characterized in that, The reference voltage calibration module is also connected to the selector module. The reference voltage calibration module is also used to collect the power supply voltage of the selector module and compare the power supply voltage of the battery sampling chip with the power supply voltage of the selector module. When the comparison result is inconsistent, the data control module is triggered to alarm.

8. The battery sampling chip according to any one of claims 1 to 7, characterized in that, The battery sampling chip also includes a sleep detection module; The sleep detection module is connected to the analog-to-digital conversion module and the data control module respectively. The sleep detection module is used to compare the converted status data transmitted by the analog-to-digital conversion module with a preset value when the device connected to the battery sampling chip is in sleep mode. If the comparison result is inconsistent, the data control module will be triggered to alarm.

9. The battery sampling chip according to any one of claims 1 to 8, characterized in that, The status data includes voltage data and / or temperature data.

10. A battery management system, characterized in that, It includes a controller and a battery sampling chip as described in any one of claims 1-9; the controller is connected to the data control module of the battery sampling chip, and the controller is used to acquire the battery status data collected by the battery sampling chip.

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