Battery pack pre-bypass circuit

Abstract

The utility model provides a battery pack pre-bypass circuit, which comprises a battery pack and a pre-bypass device, the pre-bypass device comprises a main switch module and a bypass module, the anode of the battery pack is connected with the anode of the bypass module through the main switch module, and the cathode of the battery pack is connected with the cathode of the bypass module. Every two battery packs are connected in series or in parallel through a pre-bypass device, different pre-bypass devices and different battery packs are arranged in a one-to-one correspondence mode, the signal output ends of the different pre-bypass devices are connected with IO ports of an external MCU through wires, and different main path switch modules are connected with the corresponding battery packs in series. According to the pre-bypass circuit of the battery pack, the cost of the circuit can be reduced, the structure of the circuit can be simplified, the safety and the reliability of bypass operation in a series-parallel reconfiguration battery management mode can be improved, and the protection strength on bypass devices and batteries can be improved.

Description

Technical Field

[0001] The utility model relates to the field of electric energy storage, and in particular to a battery pack pre-bypass circuit. Background Art

[0002] In the energy storage industry, in order to improve the utilization efficiency of battery packs, series-parallel reconstruction is a common battery management method. Once a faulty battery is found, it will be bypassed immediately without affecting the normal operation of other batteries in the battery pack. At present, most bypass methods are direct bypass. Once the batteries of other parallel groups are not disconnected during bypass, the bypass is equivalent to short-circuiting the parallel batteries, generating huge energy, which is easy to cause damage to the bypass devices and batteries, and in severe cases may lead to significant economic losses. Therefore, it is of great significance to study how to avoid the problem of poor safety of bypass operation in series-parallel reconstruction.

[0003] In patent CN114710014A, a high-side MOS intelligent driving circuit with current feedback composed of discrete devices is mentioned, including MOS tube module U1, a first switch control module, a second switch control module, an undervoltage protection module, an overcurrent protection module, a current feedback module and a reference source module; it can realize the high-side switch function, has two-way input and output and output current feedback function, linear output so that the CPU can accurately calculate the actual load current, and has overcurrent protection and undervoltage protection functions. When the load is short-circuited, it automatically switches to ultra-low duty cycle PWM output to prevent the MOS chip from overheating. However, the setting of the high-side switch IC chip in this application cannot avoid the problem of poor bypass operation safety in series-parallel reconstruction. The structure of the driving circuit is relatively complex and has a high cost problem. Utility Model Content

[0004] In view of this, the utility model aims to propose a battery pack pre-bypass circuit to solve the problem in the prior art that when the battery is managed in a series-parallel reconstruction manner, the existing means of bypassing faulty batteries are less safe and easily cause damage to the bypass devices and batteries; thereby, through the setting of the pre-bypass circuit, the cost of the circuit can be reduced, the structure of the circuit can be simplified, and the safety and reliability of the bypass operation in the series-parallel reconstruction battery management method can be improved, thereby enhancing the protection of the bypass devices and batteries.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model relates to a battery pack pre-bypass circuit, comprising a battery pack and a pre-bypass device, the pre-bypass device comprising a main switch module and a bypass module, the positive pole of the battery pack is connected to the positive pole of the bypass module through the main switch module, the negative pole of the battery pack is connected to the negative pole of the bypass module, 2n battery packs and 2n pre-bypass devices are provided, n is a positive integer, and n≥2, two battery packs are connected in series or in parallel through the pre-bypass device, different pre-bypass devices are provided in a one-to-one correspondence with different battery packs, signal output ends of different pre-bypass devices are respectively connected to IO ports of an external MCU through wires, and different main switch modules are connected in series with corresponding battery packs.

[0007] Further, n=2, the battery groups are respectively a first battery group BAT1, a second battery group BAT2, a third battery group BAT3 and a fourth battery group BAT4, the pre-bypass devices are respectively a pre-bypass device one, a pre-bypass device two, a pre-bypass device three and a pre-bypass device four, and the first battery group BAT1, the second battery group BAT2, the third battery group BAT3 and the fourth battery group BAT4 are respectively arranged in one-to-one correspondence with the pre-bypass device one, the pre-bypass device two, the pre-bypass device three and the pre-bypass device four.

[0008] Furthermore, the positive electrode of the first battery group BAT1 is connected to the positive electrode of the third battery group BAT3 through the main switch modules of the pre-bypass device one and the pre-bypass device three in sequence. After the negative electrodes of the first battery group BAT1 and the third battery group BAT3 are connected in parallel, they are connected to the positive electrode of the second battery group BAT2 through the main switch module of the pre-bypass device two and to the positive electrode of the fourth battery group BAT4 through the main switch module of the pre-bypass device four, and the negative electrodes of the second battery group BAT2 and the fourth battery group BAT4 are connected in parallel.

[0009] Furthermore, the positive poles of the bypass modules of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4 are respectively connected to the negative poles of the main switch modules of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4, and the negative poles of the bypass modules of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4 are respectively connected to the negative poles of the first battery group BAT1, the second battery group BAT2, the third battery group BAT3 and the fourth battery group BAT4.

[0010] Furthermore, the bypass module includes a bypass switch module, a pre-bypass switch module and a voltage sampling module. The positive poles of the bypass switch module, the pre-bypass switch module and the voltage sampling module are all connected to the negative pole of the main switch module, and the negative poles of the bypass switch module, the pre-bypass switch module and the voltage sampling module are all connected to the negative pole of the battery pack.

[0011] Furthermore, the main switch module includes an isolated power supply, a driver chip, a main control MOS tube, a first resistor, and a first capacitor, which are used to achieve a connection state between the battery pack and the power supply circuit under the control of the main control MOS tube by an external MCU.

[0012] Furthermore, the bypass switch module includes two isolated power supplies, two driving chips, a bypass control MOS tube, a second resistor, and a second capacitor, which are used to realize the bypass state between the battery pack and the power supply circuit under the control of the bypass control MOS tube by an external MCU.

[0013] Furthermore, the pre-bypass switch module includes a transistor, an optocoupler, a pre-bypass control MOS tube, a current limiting resistor, a third resistor, and a third capacitor, which is used to achieve a pre-bypass state between the battery pack and the power supply circuit under the control of the pre-bypass control MOS tube by an external MCU.

[0014] Furthermore, the voltage sampling module includes an operational amplifier, an ADC sampling chip, a fourth resistor, and a fourth capacitor, which are used to collect the voltage across the bypass module, thereby facilitating the external MCU to determine the current state of the sampled battery pack.

[0015] Furthermore, the number of bypass switch modules, pre-bypass switch modules and voltage sampling modules are 2n.

[0016] Compared with the prior art, the battery pack pre-bypass circuit described in the utility model has the following beneficial effects:

[0017] By setting up a pre-bypass circuit, the cost of the circuit can be reduced, the structure of the circuit can be simplified, and the safety and reliability of the bypass operation in the battery management method of series-parallel reconstruction can be improved, thereby enhancing the protection of bypass devices and batteries. In addition, by setting up the hardware structure of the pre-bypass circuit in the present application, the reconstruction speed of the series-parallel connection can be increased, the burden of software information transmission can be reduced, and the flexibility of the circuit setting can be improved. The opening and closing of various high-power and high-current states can be protected by this type of preprocessing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 The figure is a schematic diagram of a battery pack pre-bypass circuit composed of discrete devices.

[0020] Explanation of the reference numerals: 1. Pre-bypass device; 11. Main switch module; 12. Bypass module; 121. Bypass switch module; 122. Pre-bypass switch module; 123. Voltage sampling module. DETAILED DESCRIPTION

[0021] The following will use the terms commonly used by those skilled in the art to convey the essence of their work to other technical personnel in the art to describe the utility model concepts of the present disclosure. However, these utility model concepts can be embodied in many different forms and should not be considered as limited to the embodiments described herein.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] This embodiment is aimed at electric energy storage, and similar to conventional electric energy storage, the overall structure is composed of a battery pack and a switch.

[0025] In the prior art, series-parallel reconstruction is a commonly used battery management method. Once a faulty battery is found, it is immediately bypassed without affecting the normal operation of other batteries in the battery pack. Currently, most bypass methods are direct bypass. Once the batteries in other parallel groups are not disconnected during bypass, the bypass is equivalent to short-circuiting the parallel batteries, generating huge energy, which is easy to cause damage to the bypass device and the battery, and in serious cases may cause significant economic losses.

[0026] In order to solve the problem of poor bypass operation safety in the battery management method using series-parallel reconstruction in the prior art; this embodiment proposes a battery pack pre-bypass circuit, the circuit includes a battery pack and a pre-bypass device 1, the pre-bypass device 1 includes a main switch module 11 and a bypass module 12, the positive electrode of the battery pack is connected to the positive electrode of the bypass module 12 through the main switch module 11, and the negative electrode of the battery pack is connected to the negative electrode of the bypass module 12. The battery pack and the pre-bypass device 1 are both set to 2n, n is a positive integer, and n≥2, and the battery packs are connected in series or in parallel through the pre-bypass device 1. Different pre-bypass devices 1 are set in a one-to-one correspondence with different battery packs. The signal output ends of different pre-bypass devices 1 are respectively connected to the IO port of the external MCU through wires, and different main switch modules 11 are connected in series with the corresponding battery packs. Among them, the 2n battery groups are labeled one by one, and are respectively recorded as BAT1, BAT2, BAT3, ..., BAT2n; the battery groups BAT1, BAT3, ..., BAT2n-1 are connected in parallel with each other, and the battery groups BAT2, BAT4, ..., BAT2n are connected in parallel with each other through the main switch modules 11 corresponding to different battery groups, and any battery group among BAT1, BAT3, ..., BAT2n-1 is connected in series with the main switch module 11 corresponding to BAT2, BAT4, ..., BAT2n.

[0027] By setting different pre-bypass devices 1, the circuit cost can be reduced, the circuit structure can be simplified, and the safety and reliability of bypass operation in the series-parallel reconstruction battery management method can be improved, thereby enhancing the protection of bypass devices and batteries.

[0028] Preferably, when n=2, four battery groups and pre-bypass devices 1 are provided, the battery groups are respectively a first battery group BAT1, a second battery group BAT2, a third battery group BAT3 and a fourth battery group BAT4, the pre-bypass devices 1 are respectively a pre-bypass device one, a pre-bypass device two, a pre-bypass device three and a pre-bypass device four, the first battery group BAT1, the second battery group BAT2, the third battery group BAT3 and the fourth battery group BAT4 are respectively provided in one-to-one correspondence with the pre-bypass device one, the pre-bypass device two, the pre-bypass device three and the pre-bypass device four. The positive electrode of the first battery group BAT1 is connected to the positive electrode of the third battery group BAT3 through the main switch modules 11 of the pre-bypass device 1 and the pre-bypass device 3 in turn. After the negative electrodes of the first battery group BAT1 and the third battery group BAT3 are connected in parallel, they are connected to the positive electrode of the second battery group BAT2 through the main switch module 11 of the pre-bypass device 2 and to the positive electrode of the fourth battery group BAT4 through the main switch module 11 of the pre-bypass device 4, and the negative electrodes of the second battery group BAT2 and the fourth battery group BAT4 are connected in parallel. The positive poles of the bypass modules 12 of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4 are respectively connected to the negative poles of the main switch modules 11 of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4, and the negative poles of the bypass modules 12 of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4 are respectively connected to the negative poles of the first battery group BAT1, the second battery group BAT2, the third battery group BAT3 and the fourth battery group BAT4.

[0029] By adopting a combination of discrete devices, pre-bypass operation of the battery pack can be achieved, and the circuit has the characteristics of low cost, good stability and simple use, which is conducive to providing a more reliable and safer battery pack reconstruction method for battery management systems and related fields, and meeting the growing requirements for the flexibility of energy storage systems.

[0030] The bypass module 12 includes a bypass switch module 121, a pre-bypass switch module 122 and a voltage sampling module 123. The positive poles of the bypass switch module 121, the pre-bypass switch module 122 and the voltage sampling module 123 are all connected to the negative pole of the main switch module 11, and the negative poles of the bypass switch module 121, the pre-bypass switch module 122 and the voltage sampling module 123 are all connected to the negative pole of the battery pack. 2n bypass switch modules 121, pre-bypass switch modules 122 and voltage sampling modules 123 are each provided. In this embodiment, before the bypass switch module 121 is started, the pre-bypass switch module 122 needs to be turned on in advance, and the voltage at both ends of the battery cell of the battery pack to be tested is collected through the voltage sampling module 123, so as to pave the way for the external MCU to determine whether the bypass switch module 121 can be started.

[0031] The setting of the main switch module 11 is helpful to control whether the battery cells in the corresponding battery pack are connected to the power supply circuit, and the setting of the bypass switch module 121 is helpful to control whether the battery cells in the corresponding battery pack are bypassed. Different from the prior art, a large amount of feedback signal processing and software work are often required to handle the connection sections of different access methods during battery reconstruction. The setting of the pre-bypass switch module 122 is helpful as an intermediate state provided by hardware to increase the speed of battery series-parallel reconstruction and reduce the burden on the software; it is also helpful to avoid the occurrence of safety problems that may cause short circuits in other battery packs connected in parallel with the faulty battery during the bypass process, thereby improving the flexibility of the settings of various components in the circuit.

[0032] The main switch module 11 includes an isolation power supply, a driver chip, a main control MOS tube, a first resistor, and a first capacitor. The isolation power supply, the driver chip, the main control MOS tube, the first resistor, and the first capacitor form a bidirectional conduction power circuit, which is used to realize the on or off state between the battery pack and the power supply circuit under the control of the external MCU on the main control MOS tube. Among them, the driving signal sent by the controller, that is, the peripheral MCU, drives the main control MOS tube to realize the on and off of the battery main circuit after passing through the driver chip, and the isolation power supply provides isolation for both ends of the driver chip to isolate the internal signal of the driver chip from the driving signal. The first resistor is set between the peripheral MCU and the main control MOS tube, and the first capacitor is set between the isolation power supply and the peripheral MCU. Specifically, as shown in the figure, when the battery needs to be connected, the DRV_M1 (taking the first battery pack BAT1 as an example) signal is controlled to be turned on, the main control MOS tube is turned on, and the first battery pack BAT1 is connected to the power supply circuit. In this embodiment, the main control MOS tube is an isolated type, and the main control MOS tube can realize a two-way conduction and shutdown function through two PMOS in the form of a pair of tubes, thereby realizing the conduction and disconnection between the battery pack and the main power supply circuit.

[0033] The bypass switch module 121 includes an isolated second power supply, a second driver chip, a bypass control MOS tube, a second resistor, and a second capacitor. The bidirectional conductive power circuit composed of the isolated second power supply, the second driver chip, the bypass control MOS tube, the second resistor, and the second capacitor is used to realize the bypass state between the battery pack and the power supply circuit under the control of the bypass control MOS tube by the external MCU, that is, to connect or disconnect the bypass between the battery pack and the power supply circuit. Among them, after the driving signal sent by the peripheral MCU passes through the second driver chip, the bypass control MOS tube is driven to realize the on and off of the battery bypass. The isolated second power supply provides isolation for both ends of the second driver chip to isolate the internal signal from the driving signal. The second resistor is set between the peripheral MCU and the bypass control MOS tube, and the second capacitor is set between the isolated second power supply and the peripheral MCU. Specifically, as shown in the figure, when the battery needs to be bypassed, the DRV_B1 (taking the first battery pack BAT1 as an example) signal is controlled to be turned on, the bypass control MOS tube is turned on, and the first battery pack BAT1 is bypassed. In this embodiment, the bypass control MOS tube is an isolated type, and the bypass control MOS tube can realize a bidirectional conduction bypass function through two PMOS in the form of a pair of tubes, thereby realizing the conduction and disconnection between the battery pack and the bypass.

[0034] The pre-bypass switch module 122 includes a triode, an optical coupler, a pre-bypass control MOS tube, a current limiting resistor, a third resistor, and a third capacitor. The conduction circuit composed of the triode, the optical coupler, the pre-bypass control MOS tube, the current limiting resistor, the third resistor, and the third capacitor is used to realize the pre-bypass state between the battery pack and the power supply circuit under the control of the pre-bypass control MOS tube by the external MCU, that is, to connect or disconnect the pre-bypass in the power supply circuit. Among them, the pre-bypass signal sent by the peripheral MCU controls the on-off of the pre-bypass MOS tube after the optical coupler, so as to connect the current limiting resistor to the circuit to realize the pre-bypass operation, the third resistor is set between the peripheral MCU and the pre-bypass control MOS tube, and the third capacitor and the triode are both set between the optical coupler and the peripheral MCU. Specifically, as shown in the figure, when the battery needs to be pre-bypassed, the DRV_P1 (taking the first battery group BAT1 as an example) signal is controlled to be turned on, the pre-bypass control MOS tube is turned on, and the first battery group BAT1 is pre-bypassed. In this embodiment, the optocoupler is used for signal isolation, and an NMOS and a group of current limiting resistors are used to realize the pre-bypass function.

[0035] The voltage sampling module 123 includes an operational amplifier, an ADC sampling chip, a fourth resistor, and a fourth capacitor. The analog quantity acquisition and analog-to-digital conversion circuit composed of the operational amplifier, the ADC sampling chip, the fourth resistor, and the fourth capacitor is used to realize the acquisition of the voltage at both ends of the bypass module 12, so as to facilitate the external MCU to judge the current state of the sampled battery pack. Among them, the voltage at both ends of the battery is respectively connected to the positive and negative input ends of the operational amplifier, and after passing through the differential amplifier circuit composed of the operational amplifier, the fourth resistor, and the fourth capacitor, the voltage is adjusted to the range that can be detected by the peripheral MCU. The ADC sampling chip is used to form an analog-to-digital conversion circuit. Specifically, as shown in the figure, the voltage at both ends of the pre-bypass switch module 122, that is, the negative pole of the battery pack and the negative pole of the pre-bypass switch module 122, can be collected as a basis for judging the current state of the battery. In addition, the voltage sampling module 123 can accurately collect the voltage at both ends of the battery, and then transmit the voltage value to the MCU through the analog-to-digital conversion chip to judge whether the current state of the battery pack is correct and whether it can enter the next state.

[0036] The working process of the battery pack pre-bypass circuit composed of discrete devices is as follows: the peripheral MCU controls the main switch module 11, the bypass switch module 121, and the pre-bypass switch module 122 to work through the IO port. Taking the first battery pack BAT1 as an example, when the battery is in the main conduction state and is ready to switch to the bypass conduction state, the MCU first disables the DRV_M1 signal that controls the main switch module 11, and the main control MOS is disconnected, and then enables the pre-bypass switch module 122 signal DRV_P1, and the pre-bypass control MOS is connected, so that the battery enters the pre-bypass state. After that, the MCU reads the voltage at both ends of U1+ and U1- from the voltage sampling module 123 until the voltage drops to 0V, and then the MCU enables the DRV_B1 signal of the bypass switch module 121, and the bypass control MOS is closed, the battery pack enters the bypass state, and the entire main bypass switching is completed.

[0037] In the utility model, any power storage may include a battery pack pre-bypass circuit structure described in the present embodiment, and based on the ADC sampling chip and the related structure and assembly relationship of the optocoupler provided in the present embodiment, the power storage may also include conventional components including battery packs, switches and other structures. Since they are all prior art, they will not be described in detail here.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack pre-bypass circuit, characterized in that: The invention comprises a battery pack and a pre-bypass device (1), wherein the pre-bypass device (1) comprises a main switch module (11) and a bypass module (12), wherein the positive electrode of the battery pack is connected to the positive electrode of the bypass module (12) through the main switch module (11), and the negative electrode of the battery pack is connected to the negative electrode of the bypass module (12), and 2n battery packs and pre-bypass devices (1) are provided, wherein n is a positive integer and n≥2, and each battery pack is connected in series or in parallel through the pre-bypass device (1), and different pre-bypass devices (1) are provided in a one-to-one correspondence with different battery packs, and signal output ends of different pre-bypass devices (1) are respectively connected to an IO port of an external MCU through a wire, and different main switch modules (11) are connected in series with corresponding battery packs.

2. A battery pack pre-bypass circuit according to claim 1, characterized in that: Said n=2, the battery groups are respectively a first battery group BAT1, a second battery group BAT2, a third battery group BAT3 and a fourth battery group BAT4, the pre-bypass devices (1) are respectively a pre-bypass device 1, a pre-bypass device 2, a pre-bypass device 3 and a pre-bypass device 4, the first battery group BAT1, the second battery group BAT2, the third battery group BAT3 and the fourth battery group BAT4 are respectively arranged in one-to-one correspondence with the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4.

3. A battery pack pre-bypass circuit according to claim 2, characterized in that: The positive electrode of the first battery group BAT1 is connected to the positive electrode of the third battery group BAT3 through the main switch modules (11) of the pre-bypass device 1 and the pre-bypass device 3 in sequence; after the negative electrodes of the first battery group BAT1 and the third battery group BAT3 are connected in parallel, they are connected to the positive electrode of the second battery group BAT2 through the main switch module (11) of the pre-bypass device 2, and connected to the positive electrode of the fourth battery group BAT4 through the main switch module (11) of the pre-bypass device 4; the negative electrodes of the second battery group BAT2 and the fourth battery group BAT4 are connected in parallel.

4. A battery pack pre-bypass circuit according to claim 3, characterized in that: The positive poles of the bypass modules (12) of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4 are respectively connected to the negative poles of the main switch modules (11) of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4, and the negative poles of the bypass modules (12) of the pre-bypass device 1, the pre-bypass device 2, the pre-bypass device 3 and the pre-bypass device 4 are respectively connected to the negative poles of the first battery pack BAT1, the second battery pack BAT2, the third battery pack BAT3 and the fourth battery pack BAT4.

5. A battery pack pre-bypass circuit according to claim 1, characterized in that: The bypass module (12) comprises a bypass switch module (121), a pre-bypass switch module (122) and a voltage sampling module (123); the positive electrodes of the bypass switch module (121), the pre-bypass switch module (122) and the voltage sampling module (123) are all connected to the negative electrode of the main switch module (11); and the negative electrodes of the bypass switch module (121), the pre-bypass switch module (122) and the voltage sampling module (123) are all connected to the negative electrode of the battery pack.

6. A battery pack pre-bypass circuit according to claim 5, characterized in that: The main switch module (11) comprises an isolation power source, a driver chip, a main control MOS tube, a first resistor, and a first capacitor, and is used to achieve a connection state between the battery pack and the power supply circuit under the control of the main control MOS tube by an external MCU.

7. A battery pack pre-bypass circuit according to claim 5, characterized in that: The bypass switch module (121) comprises two isolated power supplies, two driving chips, a bypass control MOS tube, a second resistor, and a second capacitor, and is used to achieve a bypass state between the battery pack and the power supply circuit under the control of the bypass control MOS tube by an external MCU.

8. A battery pack pre-bypass circuit according to claim 5, characterized in that: The pre-bypass switch module (122) comprises a triode, an optical coupler, a pre-bypass control MOS tube, a current limiting resistor, a third resistor, and a third capacitor, and is used to realize a pre-bypass state between the battery pack and the power supply circuit under the control of the pre-bypass control MOS tube by an external MCU.

9. A battery pack pre-bypass circuit according to claim 5, characterized in that: The voltage sampling module (123) comprises an operational amplifier, an ADC sampling chip, a fourth resistor, and a fourth capacitor, and is used to collect the voltage across the bypass module (12), thereby facilitating an external MCU to determine the current state of the sampled battery pack.

10. A battery pack pre-bypass circuit according to claim 5, characterized in that: The bypass switch modules (121), the pre-bypass switch modules (122) and the voltage sampling modules (123) are each provided in 2n numbers.

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