Current sensing circuit and current sensing method

Abstract

Disclosed in the present application are a current sensing circuit and a current sensing method. The present application relates to the technical field of current sensing. The current sensing circuit comprises: a current conversion module, configured to convert an analog signal corresponding to a target current of a target battery cell into a target current digital quantity; a logic processing module, connected to the current conversion module and configured to output a target signal to a high-side drive module on the basis of a comparison sensing result between a preset threshold and the target current digital quantity; and the high-side drive module, connected to the logic processing module and configured to determine, on the basis of the target signal, whether to cut off an external power supply.

Description

Current detection circuit and current detection method

[0001] This application claims priority to Chinese patent applications filed on September 25, 2024, with application numbers 2024113457413 and 2024223546029, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of current detection technology, and more specifically, to a current detection circuit and a current detection method. Background Technology

[0003] Cell current detection, diagnosis, and protection are fundamental requirements of a battery management controller (BMS) and are essential for ensuring BMS safety and preventing thermal runaway. However, the detection, diagnosis, and protection functions are typically implemented by combining multiple different IC functional circuits; for example, one might be responsible for data acquisition and diagnosis, while another is responsible for protection execution. Technical issues

[0004] This approach is costly and difficult to design, and the frequency of failures is high, resulting in poor reliability of cell current detection, diagnosis, and protection.

[0005] Currently, there is no effective solution to the problem that the reliability of cell current detection, diagnosis and protection is poor due to the use of different IC functional circuits in related technologies. Technical solutions

[0006] In a first aspect, this application provides a current detection circuit. The current detection circuit includes: a current conversion module configured to convert an analog signal corresponding to a target current of a target battery cell into a digital value of a target current; a logic processing module connected to the current conversion module configured to output a target signal to a high-side driving module based on a comparison detection result between a preset threshold and the digital value of the target current; and the high-side driving module connected to the logic processing module configured to determine whether to cut off external power supply based on the target signal.

[0007] Secondly, this application provides a current detection method. The method includes: converting an analog signal corresponding to the target current of a target battery cell into a digital value of the target current using a current conversion module; outputting a target signal to a high-side drive module based on a comparison detection result between a preset threshold and the digital value of the target current using a logic processing module; and determining whether to cut off external power supply based on the target signal using the high-side drive module.

[0008] In a third aspect, the present application provides a computer readable storage medium, the storage medium storing a program, wherein the program controls the device where the storage medium is located to perform the current detection method when the program is running. Advantages

[0009] The present application provides the following advantages: the current conversion module is configured to convert an analog signal corresponding to a target current of a target battery cell into a target current digital quantity; the logic processing module is connected with the current conversion module and is configured to output a target signal to the high-side drive module based on a comparison detection result between a preset threshold and the target current digital quantity; and the high-side drive module is connected with the logic processing module and is configured to determine whether to cut off external power supply based on the target signal, thereby solving the problem of poor reliability of cell current detection and diagnosis protection caused by different IC functional circuits in the related art. In this solution, the current conversion module converts an analog signal corresponding to the current of the target battery cell into a target current digital quantity, and then the logic processing module outputs a target signal to the high-side drive module based on a comparison detection result between a preset threshold and the target current digital quantity. Finally, the high-side drive module determines whether to cut off external power supply based on the target signal. The cell current detection and diagnosis protection is realized by integrating the current conversion module, the logic processing module, and the high-side drive module, thereby improving the reliability of the cell current detection and diagnosis protection. BRIEF DESCRIPTION OF DRAWINGS

[0010] FIG. 1 is a schematic diagram of a current detection device according to an embodiment of the present application;

[0011] FIG. 2 is a schematic diagram of a current detection device according to an embodiment of the present application;

[0012] FIG. 3 is a schematic diagram of an analog-to-digital conversion module according to an embodiment of the present application;

[0013] FIG. 4 is a schematic diagram of an analog-to-digital conversion module according to an embodiment of the present application;

[0014] FIG. 5 is a schematic diagram of a current detection device according to an embodiment of the present application;

[0015] FIG. 6 is a schematic diagram of a logic processing module according to an embodiment of the present application;

[0016] FIG. 7 is a schematic diagram of a current detection device according to an embodiment of the present application;

[0017] FIG. 8 is a schematic diagram of a current detection device according to an embodiment of the present application;

[0018] FIG. 9 is a flowchart of a current detection method according to an embodiment of the present application;

[0019] Wherein, 10-voltage conversion module, 20-logic processing module, 30-high side drive module, 100-analog-to-digital conversion module, 101-digital correction module, 1000-carrier suppression analog modulator, 1001-digital filter, 1002-first compensation module, 1010-digital corrector, 1011-digital signal processor, 1012-second compensation module, 200-electronic buffer, 201-comparator module, 2010-serial peripheral interface, 2011-register, 2012-comparator, 40-boost circuit.

[0020] Embodiments of the present application

[0021] The present application will be described below in conjunction with the implementation device, Figure 1 is a schematic diagram of the current detection circuit according to the embodiment of the present application, as shown in Figure 1, the current detection circuit comprises: current conversion module 10, logic processing module 20 and high side drive module 30.

[0022] Current conversion module 10, set to convert the analog signal corresponding to the target current of the target battery cell into a target current digital quantity;

[0023] Logic processing module 20, connected with current conversion module 10, set to output target signal to high side drive module 30 based on the comparison detection result between the preset threshold and the target current digital quantity;

[0024] High side drive module 30, connected with logic processing module 20, set to determine whether to cut off external power supply based on the target signal.

[0025] Optionally, as shown in Figure 1, the current detection circuit provided by the embodiment of the present application at least includes current conversion module 10, logic processing module 20 and high side drive module 30. Current conversion module 10 is connected with logic processing module 20, and logic processing module 20 is connected with high side drive module 30. The analog signal corresponding to the target current of the target battery cell is received through current conversion module 10. It should be noted that the current of the target battery cell can be collected through a current collection device, and then the collected current is input to the receiving PIN pin in current conversion module 10. After receiving the analog signal corresponding to the target current of the target battery cell, current conversion module 10 extracts the digital signal by discrete quantization filtering of the analog current signal, and converts the obtained digital quantity into accurate current digital quantity, and then obtains the above-mentioned target current digital quantity.

[0026] After obtaining the target current digital quantity, the current conversion module 10 can transmit the target current digital quantity to the logic processing module 20 through a serial peripheral interface (SPI interface), and the logic processing module 20 outputs a target signal to the high-side drive module 30 based on a comparison detection result between a preset threshold value and the target current digital quantity, that is, the logic processing module performs threshold value judgment. According to the threshold value judgment result, a response signal is triggered to the high-side drive module 30. The high-side drive module 30 determines whether to cut off external power supply according to the target signal. For example, when the battery cell current value reaches the configured threshold value, the CMD logic control signal of the high-side drive module 30 is triggered to perform a shutdown action, so as to cut off the external power supply of the battery for protection.

[0027] It should be noted that the CMD logic control signal of the high-side drive module 30 refers to a logic signal configured to control the switching state of the high-side driver. In the application of the high-side driver, these signals can be controlled through the SPI interface or other communication protocols.

[0028] It should be noted that the logic processing module 20 can be implemented by a digital comparator, and can also be implemented by a current detector.

[0029] In summary, the current conversion module converts the analog signal corresponding to the current of the target battery cell into a target current digital quantity, and then the logic processing module outputs a target signal to the high-side drive module based on a comparison detection result between a preset threshold value and the target current digital quantity. Finally, the high-side drive module determines whether to cut off the external power supply based on the target signal. The current conversion module, the logic processing module and the high-side drive module are integrated to realize the battery cell current detection and diagnosis protection, thereby improving the reliability of the battery cell current detection and diagnosis protection.

[0030] Optionally, in the current detection circuit provided in the embodiment of the present application, the current conversion module 10 comprises: an analog-to-digital conversion module 100 connected with a digital correction module 101, configured to convert an analog signal corresponding to a target current of a target battery cell into a digital signal corresponding to the target current; and the digital correction module 101 is configured to process the digital signal corresponding to the target current to obtain a target current digital quantity.

[0031] In an optional embodiment, as shown in FIG. 2, the current conversion module 10 comprises an analog-to-digital conversion module 100 and a digital correction module 101. The analog-to-digital conversion module 100 is configured to modulate the analog signal corresponding to the target current to obtain a modulated signal, for example, to discretize the analog signal, and then filter the discretized signal to extract a digital signal, thereby obtaining the digital signal corresponding to the target current. In order to improve the accuracy of the digital signal, the digital correction module 101 is used to check and encode the digital signal to obtain an accurate current digital quantity, for example, by using register mapping control and NVM storage parameter configuration to check and encode the digital quantity to obtain the accurate current digital quantity.

[0032] In an optional embodiment, the current conversion module 10 can further comprise a diagnosis module (DIAG). The DIAG is used to monitor and diagnose the accuracy of the current value. The DIAG can be used to detect whether the current conversion module 10 is working normally, whether the current exceeds a threshold value, and the like.

[0033] The analog-to-digital conversion module 100 and the digital correction module 101 can be used to accurately extract the current digital quantity corresponding to the battery cell.

[0034] Optionally, in the current detection circuit provided in the embodiments of the present application, the current conversion module 10 further comprises an analog filter 102, which is connected to the analog-to-digital conversion module 100 and is configured to filter the received initial analog signal corresponding to the target current to obtain the analog signal corresponding to the target current.

[0035] In an optional embodiment, as shown in FIG. 3, the current conversion module 10 further comprises an analog filter 102, which is connected to the analog-to-digital conversion module 100. The analog filter 102 is used to filter the received initial analog signal corresponding to the target current to obtain the analog signal corresponding to the target current.

[0036] The analog filter can effectively remove or reduce unnecessary frequency components while retaining the required signals, thereby improving the accuracy of the subsequent analog signal corresponding to the target current.

[0037] Optionally, in the current detection circuit provided in the embodiments of the present application, the analog-to-digital conversion module 100 comprises a carrier suppression analog modulator 1000, which is configured to modulate the analog signal corresponding to the target current to obtain a modulated signal; and a digital filter 1001, which is connected to the carrier suppression analog modulator 1000 and is configured to filter the modulated signal to obtain the digital signal corresponding to the target current.

[0038] In an optional embodiment, as shown in FIG. 4, the analog-to-digital conversion module 100 is composed of a carrier suppression analog modulator 1000 and a digital filter 1001. After receiving the current value of the target battery cell, the carrier suppression analog modulator 1000 modulates the analog signal corresponding to the target current, for example, performs a discretization process on the analog signal corresponding to the target current to obtain the modulated signal described above. The digital filter 1001 filters the modulated signal to obtain the digital signal corresponding to the target current, that is, the digital filter 1001 filters the discretized signal to obtain the digital signal corresponding to the target current described above.

[0039] Optionally, in the current detection circuit provided in the embodiments of the present application, the analog-to-digital conversion module 100 includes a first compensation module 1002 connected with the digital filter 1001 and configured to perform compensation processing when the digital filter 1001 filters the modulated signal to obtain the digital signal corresponding to the target current.

[0040] In an optional embodiment, as shown in FIG. 4, the analog-to-digital conversion module 100 further includes a first compensation module 1002 connected with the digital filter 1001 to perform compensation processing when the digital filter 1001 filters the modulated signal to obtain the digital signal corresponding to the target current. It should be noted that the first compensation module 1002 can obtain compensation parameters through an SPI interface to compensate the signal. The compensation processing performed by the first compensation module 1002 can effectively improve the accuracy of the digital signal corresponding to the target current.

[0041] Optionally, in the current detection circuit provided in the embodiments of the present application, the digital correction module 101 includes a digital corrector 1010 connected with the analog-to-digital conversion module 100 and configured to correct the digital signal corresponding to the target current to obtain a corrected digital signal; a digital signal processor 1011 connected with the digital corrector 1010 and configured to perform average value processing on the corrected digital signal to obtain the target current digital quantity; and a second compensation module 1012 connected with the digital corrector 1010 and the digital signal processor 1011 and configured to perform compensation processing when the digital corrector 1010 corrects the digital signal corresponding to the target current to obtain the corrected digital signal, and configured to perform compensation processing when the digital signal processor 1011 performs average value processing on the corrected digital signal to obtain the target current digital quantity.

[0042] In an optional embodiment, as shown in FIG. 5, the digital correction module 101 is composed of a digital corrector 1010, a digital signal processor 1011, and a second compensation module 1012. The digital corrector 1010 is connected with the analog-digital conversion module 100, the digital signal processor 1011 is connected with the digital corrector 1010, and the second compensation module 1012 is connected with the digital corrector 1010 and the digital signal processor 1011. The digital signal corresponding to the target current is corrected by the digital corrector 1010 to obtain a corrected digital signal, and then the corrected digital signal is subjected to average value processing by the digital signal processor 1011 to obtain the target current digital quantity. It should be noted that, in order to improve the accuracy of the current digital quantity, the second compensation module 1012 performs compensation processing when the digital corrector 1010 corrects the digital signal corresponding to the target current and when the digital signal processor 1011 processes the corrected digital signal. The target current digital quantity described above can be more accurately obtained through the digital corrector 1010, the digital signal processor 1011, and the second compensation module 1012.

[0043] Optionally, in the current detection circuit provided in the embodiment of the present application, the logic processing module 20 further comprises: an electronic buffer 200, configured to receive a control signal to drive the comparator module 201 to work; and the comparator module 201, configured to output a target signal to the high-side drive module 30 based on a comparison detection result between a preset threshold value and the target current digital quantity.

[0044] In an optional embodiment, as shown in FIG. 6, the logic processing module 20 is composed of an electronic buffer 200 and a comparator module 201. The electronic buffer 200 is connected with the comparator module 201, and receives a control signal through the electronic buffer 200 to drive the comparator module 201 to work. After receiving the driving signal, the comparator module 201 outputs a target signal to the high-side drive module 30 based on a comparison detection result between a preset threshold value and the target current digital quantity.

[0045] Optionally, in the current detection circuit provided in the embodiment of the present application, the comparator module 201 comprises: a serial peripheral interface 2010, configured to receive the target current digital quantity and write the target current digital quantity into a register 2011; the register 2011, configured to store the target current digital quantity; and a comparator 2012, configured to output a target signal to the high-side drive module 30 based on a comparison detection result between a preset threshold value and the target current digital quantity.

[0046] In an optional embodiment, as shown in FIG. 7, the comparator module 201 is composed of a serial peripheral interface 2010, a register 2011 and a comparator 2012. The target current digital quantity is received through the serial peripheral interface 2010 and written into the register 2011. The comparator 2012 outputs a target signal to the high-side drive module 30 based on the comparison result between the preset threshold and the target current digital quantity, that is, the threshold judgment is performed by the comparator 2012 to output the target signal to the edge drive module. For example, when the battery current value reaches the configured threshold, the CMD logic control signal of the high-side drive module is triggered to perform the shutdown action, thereby cutting off the external power supply for protection.

[0047] It should be noted that the high-side drive module 30 described above can be composed of a field effect transistor. The external power supply is cut off by the high-side drive module 30.

[0048] Optionally, in the current detection circuit provided in the embodiments of the present application, the current detection circuit further comprises a boost circuit 40 connected with the high-side drive module 30 and the logic processing module 20. The logic processing module 20 provides a clock signal for the boost circuit 40, so that the boost circuit 40 outputs a preset voltage value to the high-side drive module 30, to drive the high-side drive module 30 to work based on the preset voltage value.

[0049] In an optional embodiment, to achieve the high-side drive function described above, the current detection circuit provided in the embodiments of the present application needs to be provided with a boost circuit, therefore, as shown in FIG. 8, the current detection circuit is further provided with a boost circuit 40, wherein the boost circuit 40 is connected with the high-side drive module 30 and the logic processing module 20. The logic processing module 20 provides a clock signal for the boost circuit 40, so that the boost circuit 40 outputs a preset voltage value to the high-side drive module 30, to drive the high-side drive module 30 to work based on the preset voltage value. It should be noted that the boost circuit 40 can be a Charge Pump boost circuit. The high-side drive module 30 is driven by the boost circuit to perform the shutdown action, thereby cutting off the external power supply for protection.

[0050] In an optional embodiment, the boost circuit 40 can be a direct current boost circuit. The working principle of the direct current boost circuit is to use the energy storage and release characteristics of inductors and capacitors, to adjust the output voltage by controlling the switching frequency and duty cycle of the switching element. When the switching element is turned on, the inductor stores energy; when the switching element is turned off, the energy stored in the inductor is released to the load through the diode and the capacitor, thereby achieving voltage boosting. The controller adjusts the duty cycle of the switching element according to the feedback signal of the output voltage, to maintain a stable output voltage. The high-side drive module 30 can be provided with a stable driving voltage by the direct current boost circuit.

[0051] In an optional embodiment, the quantification reliability analysis method of the current detection circuit is implemented as follows:

[0052] (1) The overall failure rate of the BMS integrated chip is calculated based on the IEC 62380 standard, and the related module failure rate of the current detection circuit is decomposed, as shown in Table 1.

[0053] (2) The failure of the current detection circuit is analyzed by DFMEA to develop a reliability safety measure mechanism, such as SM_01 analog signal self-checking comparison, SM_02 calibration parameter download CRC check, SM_03 independent CRC generator and detection circuit, SM_04 analog multi-channel acquisition switch to digital-analog conversion decoding threshold self-checking, SM_05 full-temperature redundant ADC circuit conversion cross-checking fault injection, SM_06 fault injection self-checking, SM_07 full-redundant temperature ADC circuit conversion cross-checking, SM_08 charge pump voltage monitoring, SM_09 power supply over / under voltage diagnosis, SM_10 analog self-checking, SM_11 drive comparison self-checking, SM_12 background download calibration data CRC check, and the related diagnostic coverage is defined with reference to ISO 26262, as shown in Table 1.

[0054] (3) The current detection circuit is quantitatively analyzed by FMEDA with reference to the ISO 26262 standard, and the internal components of the current detection circuit integrated chip are analyzed. The component failure rate in (1) is diagnosed by the measure mechanism in (2), so that the residual or single-point failure rate is 0.242702 FIT, and the potential multi-point failure rate is 0.17688826 FIT, and the analysis process is shown in Table 1.

[0055] Table 1

[0056] Component name FIT in the calculation to consider the reliability and safety related component failure mode failure distribution ( % ) remaining reliability and safety related failure rate ( FIT ) in the absence of reliability and safety mechanisms, violation of safety target failure mode? Prevent failure mode violation of reliability and safety target? Failure mode diagnostic coverage ( % ) remaining or single point failure failure rate ( FIT ) may cause violation of reliability and safety target failure mode? Prevent potential failure mode security mechanism? Potential failure mode coverage ( % ) potential multi-point failure failure rate ( FIT ) current conversion check diagnosis 2.0704 YES Current conversion check diagnosis failure 100 2.0704 YES SM_07, SM_05 99.00.020704 YES SM_04, SM_06 99.00.02049696 Logic processing 1.1984 YES Logic processing failure 100 1.1984 YES SM_02, SM_03, SM_12 99.00.011984 NO --- High side drive 2.84 YES High side drive failure 100 2.84 YES SM_01, SM_11 99.00.0284 NO --- Charge pump 2.3643 YES Charge pump failure 100 2.3643 YES SM_08 99.00.023643 NO --- Power supply 15.797 YES Power supply failure 100 15.7971 YES SM_09 99.00.157971 YES SM_10 99.00.1563913

[0057] The current detection circuit provided by the embodiments of the present application is configured to convert an analog signal corresponding to a target current of a target battery cell into a target current digital quantity through a current conversion module; a logic processing module is connected with the current conversion module and is configured to output a target signal to a high-side drive module based on a comparison detection result between a preset threshold and the target current digital quantity; and the high-side drive module is connected with the logic processing module and is configured to determine whether to cut off external power supply based on the target signal, thereby solving the problem that the reliability of cell current detection diagnosis protection is poor in the prior art because different IC functional circuits are used to realize cell current detection diagnosis protection. In the present application, the analog signal corresponding to the current of the target battery cell is converted into the target current digital quantity through the current conversion module, and then the logic processing module outputs the target signal to the high-side drive module based on the comparison detection result between the preset threshold and the target current digital quantity. Finally, the high-side drive module determines whether to cut off external power supply based on the target signal. The cell current detection diagnosis protection is realized through the integrated manner among the current conversion module, the logic processing module and the high-side drive module, and the reliability of the cell current detection diagnosis protection is improved.

[0058] FIG. 9 is a flow chart of a current detection method according to an embodiment of the present application. As shown in FIG. 9, the method comprises the following steps:

[0059] In step S901, the analog signal corresponding to the target current of the target battery cell is converted into a target current digital quantity by a current conversion module.

[0060] In step S902, a target signal is output to a high-side drive module based on a comparison detection result between a preset threshold and the target current digital quantity by a logic processing module.

[0061] In step S903, it is determined whether to cut off external power supply based on the target signal by the high-side drive module.

[0062] The analog signal corresponding to the target current of the target battery cell is received by the current conversion module. It should be noted that the current of the target battery cell can be collected by a current collection device, and then the collected current is input to the receiving PIN pin in the current conversion module. After the analog signal corresponding to the target current of the target battery cell, the current conversion module discretizes and quantizes the analog current signal to extract a digital signal, and converts the obtained digital quantity into an accurate current digital quantity, and then obtains the above-mentioned target current digital quantity.

[0063] After obtaining the above-mentioned target current digital quantity, the current conversion module can be transmitted to the logic processing module through a serial peripheral interface (SPI interface), and the logic processing module outputs a target signal to the high-side drive module based on a comparison detection result between a preset threshold and the target current digital quantity, that is, the logic processing module performs threshold judgment. According to the threshold judgment result, the signal triggered in response is sent to the high-side drive module. The high-side drive module determines whether to cut off external power supply according to the target signal. For example, when the cell current value reaches the configured threshold, the CMD logic control signal of the high-side drive module is triggered to execute the shutdown action, so as to cut off the external power supply of the battery for protection.

[0064] It should be noted that the CMD logic control signal of the high-side drive module refers to a logic signal set to control the switching state of the high-side driver. In the application of the high-side driver, these signals can be controlled through the SPI interface or other communication protocols.

[0065] In summary, the analog signal corresponding to the current of the target battery cell is converted into a target current digital quantity by the current conversion module, and then the logic processing module outputs a target signal to the high-side drive module based on a comparison detection result between a preset threshold and the target current digital quantity. Finally, whether to cut off external power supply is determined by the high-side drive module based on the target signal. The current conversion module, the logic processing module and the high-side drive module are integrated to realize cell current detection and diagnosis protection, and the reliability of cell current detection and diagnosis protection is improved.

[0066] An embodiment of the present application provides a computer readable storage medium, which stores a program, and the program is executed by a processor to implement the current detection method. The computer readable storage medium can be nonvolatile or volatile.

[0067] An embodiment of the present application provides a processor, which is arranged to run a program, and the program is executed to implement the current detection method.

[0068] An embodiment of the present application provides an electronic device, which comprises a processor, a memory, and a program stored in the memory and capable of running on the processor, and the processor implements the current detection when running the program.

Claims

1. A current detection circuit, comprising: a current conversion module (10) configured to convert an analog signal corresponding to a target current of a target battery cell into a target current digital quantity; a logic processing module (20) connected with the current conversion module (10) and configured to output a target signal to a high-side drive module (30) based on a comparison detection result between a preset threshold and the target current digital quantity; the high-side drive module (30) connected with the logic processing module (20) and configured to determine whether to cut off external power supply based on the target signal.

2. The current sense circuit of claim 1, wherein, The current conversion module (10) comprises: an analog-to-digital conversion module (100) connected with a digital correction module (101) and configured to convert an analog signal corresponding to a target current of a target battery cell into a digital signal corresponding to the target current; the digital correction module (101) configured to process the digital signal corresponding to the target current to obtain the target current digital quantity.

3. The current sense circuit of claim 2, wherein, The current conversion module (10) further comprises: an analog filter (102) connected with the analog-to-digital conversion module (100) and configured to filter an initial analog signal corresponding to the target current received to obtain the analog signal corresponding to the target current.

4. The current sense circuit of claim 2, wherein, The analog-to-digital conversion module (100) comprises: a carrier suppression analog modulator (1000) configured to modulate the analog signal corresponding to the target current to obtain a modulated signal; a digital filter (1001) connected with the carrier suppression analog modulator (1000) and configured to filter the modulated signal to obtain the digital signal corresponding to the target current.

5. The current sense circuit of claim 4, wherein, The analog-to-digital conversion module (100) comprises: a first compensation module (1002) connected with the digital filter (1001) and configured to perform compensation processing when the digital filter (1001) filters the modulated signal to obtain the digital signal corresponding to the target current.

6. The current sense circuit of claim 2, wherein, The digital correction module (101) comprises: a digital corrector (1010) connected with the analog-to-digital conversion module (100) and configured to correct the digital signal corresponding to the target current to obtain a corrected digital signal; a digital signal processor (1011) connected with the digital corrector (1010) and configured to perform average value processing on the corrected digital signal to obtain the target current digital quantity; a second compensation module (1012) connected with the digital corrector (1010) and the digital signal processor (1011) and configured to perform compensation processing when the digital corrector (1010) corrects the digital signal corresponding to the target current to obtain the corrected digital signal, and configured to perform compensation processing when the digital signal processor (1011) performs average value processing on the corrected digital signal to obtain the target current digital quantity.

7. The current sense circuit of claim 1, wherein, The logic processing module (20) further comprises: an electronic buffer (200) configured to receive a control signal to drive a comparator module (201) to work; The comparator module (201) is configured to output a target signal to the high-side drive module (30) based on a comparison result between the preset threshold and the target current digital quantity.

8. The current sense circuit of claim 7, wherein, The comparator module (201) comprises: a serial peripheral interface (2010) configured to receive the target current digital quantity and write the target current digital quantity into a register (2011); the register (2011) is configured to store the target current digital quantity; a comparator (2012) configured to output a target signal to the high-side drive module (30) based on a comparison result between the preset threshold and the target current digital quantity.

9. The current sense circuit of any one of claims 1 to 8, wherein, The current detection circuit further comprises: a boost circuit (40) connected with the high-side drive module (30) and the logic processing module (20), wherein the logic processing module (20) provides a clock signal for the boost circuit (40) to make the boost circuit (40) output a preset voltage value to the high-side drive module (30) to drive the high-side drive module (30) to work based on the preset voltage value.

10. The current sense circuit of claim 9, wherein, The boost circuit (40) is a direct current boost circuit.

11. A current detection method, comprising: converting an analog signal corresponding to a target current of a target battery cell into a target current digital quantity by a current conversion module; outputting a target signal to a high-side drive module based on a comparison result between a preset threshold and the target current digital quantity by a logic processing module; determining whether to cut off external power supply based on the target signal by the high-side drive module.

12. A computer-readable storage medium comprising a stored program, wherein, The program controls the storage medium to execute the current detection method of claim 11 when the program is running.

Images