Parallel quick-change battery positioning circuit

Abstract

The utility model discloses a parallel connection quick-change battery positioning circuit which is provided with N battery cabins which are consistent in structure and are arranged in parallel, each battery cabin is internally provided with a battery pack, the number, specification and model of all batteries in each battery pack are consistent, positive electrodes of all the batteries are connected in parallel to form a positive power supply end of the battery cabin, and negative electrodes of all the batteries are connected in parallel to form a negative power supply end of the battery cabin. The battery compartment is further provided with a communication end X and a sampling end; wherein positive power supply ends of all the battery compartments are connected with a power supply interface B + of the main control module through a power-off main switch K1, and negative power supply ends of all the battery compartments are connected with a power supply interface B-of the main control module; the data ends X of all the battery compartments are connected with the data end X1 of the main control module through a bus; and the sampling end of any battery compartment is connected with the positive power supply end of the battery compartment. The device can automatically identify the ID of the battery compartment, accurately position a fault or a battery pack with lower electric quantity, and improve the battery replacement speed.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a parallel fast-changing battery positioning circuit. Background Art

[0002] As a new energy vehicle, an electric vehicle has the characteristics of low noise, high energy utilization efficiency, and no mobile waste emissions, and has become one of the strategic emerging industries strongly supported by our country. However, there are still many problems to be solved in the use of electric vehicles.

[0003] Compared with traditional fuel vehicles, electric vehicles have a long charging time and are not convenient for long-distance driving. When the fuel in a fuel vehicle is insufficient, it only takes a few minutes to fill up the fuel, while an electric vehicle needs several hours or even longer to fully charge. Although the charging speed has doubled with the development of technology, it still takes more than half an hour. At the same time, fast charging will cause certain damage to the battery of the electric vehicle and shorten the battery life.

[0004] To solve the above problems, the battery swapping mode for electric vehicles has emerged. The battery swapping mode refers to the centralized storage, centralized charging, and unified distribution of a large number of batteries through a centralized charging station, and the battery replacement service for electric vehicles in the battery distribution station or the integration of battery charging, logistics allocation, and battery replacement services.

[0005] This mode can save the vehicle owner a large amount of battery purchase costs and solve the problem of too long charging time.

[0006] However, during the battery swapping process, each battery pack needs to be detected to locate the battery pack that needs to be replaced or maintained, so as to perform battery swapping specifically. Therefore, the battery swapping is not only complicated in operation but also takes a long time, and fast battery swapping cannot be achieved. Content of the Utility Model

[0007] The purpose of the utility model is to provide a parallel fast-changing battery positioning circuit, which can automatically identify the battery compartment ID, accurately locate the faulty or low-power battery pack, simplify the battery swapping operation, improve the battery swapping speed, and realize the individual or parallel discharge of any battery pack, effectively ensuring the charging and discharging safety of the battery pack and extending the service life of the battery compartment.

[0008] A parallel fast-changing battery positioning circuit is characterized in that N battery compartments with the same structure and arranged in parallel are provided. Each battery compartment is also provided with a battery pack. The number, specifications, and models of all the batteries in the battery pack are the same, and the positive electrodes of all the batteries are connected in parallel to form the positive power supply terminal of the battery compartment, and the negative electrodes of all the batteries are connected in parallel to form the negative power supply terminal of the battery compartment. The battery compartment is also provided with a communication terminal X and a sampling terminal;

[0009] Among them, the positive power supply terminals of all battery compartments are connected to the power interface B+ of the main control module via the main power-off switch K1, and the negative power supply terminals of all battery compartments are connected to the power interface B- of the main control module;

[0010] The data terminals X of all battery compartments are connected to the data terminal X1 bus of the main control module;

[0011] The sampling terminal of any one battery compartment is connected to the positive power supply terminal of its own battery compartment;

[0012] The main control module is provided with a power supply terminal B1+ connected to the load, and the charging terminal B2+ of the main control module is connected to the charging power supply.

[0013] The battery compartment transmits data to and from the main control module via a bus. The main control module can accurately locate the battery compartment based on the feedback signal of the battery compartment, enabling any battery compartment to discharge alone or in parallel, while maximizing the charging and discharging capabilities of the battery compartment, effectively ensuring the safety of battery compartment charging and discharging, and extending the service life of the battery compartment;

[0014] The power supply terminal B1+ and the charging terminal B2+ in the main control module are connected to the power supply terminal B+ via an internal circuit, respectively realizing the discharging and charging functions of the system.

[0015] Further, the main control module is also provided with a detection terminal J1, which is connected to the ECU and used to detect whether there is an energy recovery trigger signal.

[0016] Further, a power management module is provided in the battery compartment. The power management module is provided with M detection terminals, and each detection terminal is preset with an ID identifier, and the ID identifier corresponds one-to-one to the number of the battery compartment;

[0017] Select 1 detection terminal with an ID identifier corresponding to the number of the battery compartment from the M detection terminals as the sampling terminal of the battery compartment;

[0018] The data terminal X of the power management module is the data terminal X of the battery compartment.

[0019] The power management module independently detects the battery compartment it manages and sends the detection information to the main control module. The ID identifier preset in its detection terminal carries the number information of the battery compartment. The main control module realizes accurate positioning of the battery compartment by identifying the number information.

[0020] Further, the battery pack is connected with an MOS transistor Q1. The source electrode of the MOS transistor Q1 is connected to the positive power supply terminal of the battery compartment, the gate electrode of the MOS transistor Q1 is connected to the control terminal CTRL1 of the power management module, and the drain electrode of the MOS transistor Q1 is connected to the main power-off switch K1.

[0021] The power management module controls the MOS transistor Q1 to conduct, thereby controlling the discharge of the battery pack.

[0022] Further, the battery pack is connected with an MOS transistor Q2. The source electrode of the MOS transistor Q2 is connected with the power-off main switch K1. The gate electrode of the MOS transistor Q2 is connected with the control terminal CTRL2 of the power management module. The drain electrode of the MOS transistor Q2 is connected with the positive power supply terminal of the battery compartment.

[0023] The power management module controls the charging of the battery pack by controlling the conduction of the MOS transistor Q2.

[0024] Further, all the battery packs have the same structure and the same connection mode.

[0025] Further, the bus is a CAN bus or a LIN bus.

[0026] Each of the battery management modules is used to regularly obtain the remaining power S n , the allowable charging current I jn and the allowable discharging current I kn of its corresponding battery pack, and send them to the main control module respectively;

[0027] The main control module is used to calculate the available remaining power S, the maximum allowable charging current I n , jn and the maximum allowable discharging current I kn of all the battery packs according to the remaining power S j , max and the allowable discharging current I; kmax .

[0028] Further, the calculation formula of the available remaining power S is:

[0029] S, = S - S0

[0030] wherein, S is the total remaining power of all the battery packs, and S0 is the power holding threshold;

[0031] wherein, the calculation formula of the total remaining power S of all the battery packs is:

[0032]

[0033] wherein, n is the number of all the battery compartments, and S n is the remaining power of the battery pack in the nth battery compartment;

[0034] The calculation formula of the maximum allowable charging current I j , max is:

[0035] I j , max = Ijmax +I jmin (n - 1)

[0036] Among them, I jmax is the maximum allowable charging current of a single battery pack, I jmin is the minimum allowable charging current of a single battery pack, and n is the number of all battery compartments;

[0037] Among them, the formula for calculating the maximum allowable charging current I jmax of a single battery pack is:

[0038] I jmax = max 0～n I jn

[0039] Among them, max 0～n is to find the maximum value among n battery compartments, max is the maximum value function, n is the number of all battery compartments, and I jn is the allowable charging current of the battery pack in the j - th battery compartment among n battery compartments;

[0040] The formula for calculating the minimum allowable charging current I jmin of a single battery pack is:

[0041] I jmin = min 0～n I jn

[0042] Among them, min 0～n is to find the minimum value among n battery compartments, min is the minimum value function, n is the number of all battery compartments, and I jn is the allowable charging current of the battery pack in the j - th battery compartment among n battery compartments;

[0043] The maximum allowable discharge current I, kmax the formula for calculating it is:

[0044] I, kmax = I kmax + I kmin (n - 1)

[0045] Among them, I kmax is the maximum allowable discharge current of a single battery pack, I kmin is the minimum allowable discharge current of a single battery pack, and n is the number of all battery compartments;

[0046] Among them, the formula for calculating the maximum allowable discharge current I kmax of a single battery pack is:

[0047] I kmax = max 0～n Ikn

[0048] Among them, max 0～n is to find the maximum value among n battery compartments, max is the maximum value function, n is the number of all battery compartments, and I kn is the allowable discharge current of the battery pack in the k-th battery compartment among n battery compartments;

[0049] The minimum allowable discharge current I of a single battery pack kmin The calculation formula is:

[0050] I kmin = min 0～n I kn

[0051] Among them, min 0～n is to find the minimum value among n battery compartments, min is the minimum value function, n is the number of all battery compartments, and I kn is the allowable discharge current of the battery pack in the k-th battery compartment among n battery compartments.

[0052] Furthermore, before starting the motor, the main control module determines whether all the battery packs are effectively drive-enabled according to the available remaining driving power S;

[0053] When the available remaining driving power S is not greater than 0, the drive enable is invalid, and the main control module issues a charging reminder and waits for the charging power supply to be connected for charging;

[0054] When the available remaining driving power S is greater than 0, the drive enable is effective, and the main control module determines whether the parallel fast-switching battery system is in a charging state;

[0055] When the main control module detects that a charging power supply is connected, the main control module charges step by step according to the remaining power of all the battery packs;

[0056] When the main control module does not detect that a charging power supply is connected, the main control module determines whether the output power of all the battery packs in parallel is less than the load driving power;

[0057] When the output power of the battery packs in parallel is greater than or equal to the load driving power, the main control module discharges in a matching manner according to the remaining power of all the battery packs;

[0058] When the output power of the battery packs in parallel is less than the load driving power, the main control module issues an alarm reminder.

[0059] Furthermore, the step-by-step charging is as follows:

[0060] The master control module preferentially sends a charging signal to the power management module corresponding to the battery pack with the least remaining power. The corresponding power management module controls the MOS transistor Q1 in the corresponding battery pack to turn off and the MOS transistor Q2 to turn on, and the battery pack with the least remaining power starts to charge;

[0061] When the remaining power of the battery pack with the least remaining power is the same as that of the battery pack with the second least remaining power, the master control module sends a charging signal to the power management module corresponding to the battery pack with the second least remaining power. The corresponding power management module controls the MOS transistor Q1 in the corresponding battery pack to turn off and the MOS transistor Q2 to turn on, and the two battery packs charge simultaneously;

[0062] The master control module controls the charging of other battery packs step by step according to the above operations;

[0063] The master control module controls the charging current of all the battery packs to be less than the maximum allowable charging current I j , max 。

[0064] Further, the matching discharge is as follows:

[0065] The master control module preferentially selects a single battery pack or a combination of multiple battery packs for discharging in the battery pack with the most remaining power according to the demand of the load driving power;

[0066] The master control module sends a discharge signal to the corresponding battery management module. The corresponding battery management module controls the MOS transistor Q1 in all the battery packs of a single battery pack or a combination of multiple battery packs to turn on and the MOS transistor Q2 to turn off, and the combined discharge drives the load;

[0067] The master control module controls the discharge current of all the battery packs to be less than the maximum allowable discharge current I, kmax 。

[0068] Further, the combined discharge is as follows:

[0069] The master control module controls the output power of the discharge combination through the duty cycle to meet the demand of the load driving power;

[0070] Among them, the discharge duration of the battery pack with a higher voltage is longer than that of the battery pack with a lower voltage.

[0071] Difference between high voltage value and set value: Difference between low voltage value and set value = ratio of their discharge durations.

[0072] Set value = voltage value of the lowest voltage battery pack - U a ,where U a is the difference between the average voltage value of all the battery packs in the discharge combination and the voltage value of the lowest voltage battery pack.

[0073] The relationship between the voltage value and the amount of electricity is a well-known common sense and will not be elaborated here.

[0074] The duty cycle adjusts the discharge duration of each battery pack in the discharge combination, thereby leveling the remaining power in each battery pack, reducing the damage to the battery pack caused by uneven discharge, and extending the service life of the battery pack.

[0075] Furthermore, the main control module is also used to detect whether there is an energy recovery trigger signal;

[0076] When there is an energy recovery trigger signal, the main control module controls the recovery charging of all battery packs in a step-by-step charging manner;

[0077] The main control module controls the recovery charging current to be less than or equal to the allowable charging current I of the battery pack with the lowest voltage jn 。

[0078] Beneficial effects: 1. The structure of the present utility model is simple, with a high degree of functional integration, and can be extended and applied to a variety of products.

[0079] 2. The present utility model can automatically identify the battery compartment ID, accurately locate the faulty or low-power battery pack, simplify the battery replacement operation, improve the battery replacement speed, effectively ensure the safety of battery replacement, and improve the convenience of battery replacement.

[0080] 3. The present utility model can realize the individual or parallel discharge of any battery pack, maximize the use of the maximum discharge capacity and charging capacity of the battery pack, ensure the safety of charging and discharging of the battery pack, and extend the service life of the battery pack. Description of the Drawings

[0081] Figure 1 It is a schematic diagram of the positioning system for parallel fast-replaceable batteries;

[0082] Figure 2 It is a schematic diagram of the battery compartment. Specific Embodiments

[0083] The following further elaborates in detail the specific embodiments and working principles of the present utility model in conjunction with the drawings.

[0084] As Figure 1 shown, the parallel fast-replaceable battery positioning circuit is provided with three battery compartments with the same structure and a main control module. Each battery compartment has a unique number, and the numbers of the three battery compartments are 1#, 2#, and 3# respectively;

[0085] As Figure 2 shown, a power management module and a battery pack are provided in each of the 1# battery compartment, 2# battery compartment, and 3# battery compartment

[0086] The battery management module is provided with a detection terminal 1, a detection terminal 2, a detection terminal 3, a data terminal X, a control terminal C1, and a control terminal C2;

[0087] All the batteries in the battery pack have the same quantity, specification, and model, and the positive electrodes of all the batteries are connected in parallel to form the positive power supply terminal of the battery compartment, and the negative electrodes of all the batteries are connected in parallel to form the negative power supply terminal of the battery compartment.

[0088] The battery pack is connected with an MOS transistor Q1 and an MOS transistor Q2;

[0089] Among them, the source electrode of the MOS transistor Q1 is connected to the positive power supply terminal of the battery compartment, the gate electrode of the MOS transistor Q1 is connected to the control terminal C1 of the power management module, and the drain electrode of the MOS transistor Q1 is connected to the power interface B+ of the main control module through the power-off main switch K1;

[0090] The source electrode of the MOS transistor Q2 is connected to the power interface B+ of the main control module through the power-off main switch K1, the gate electrode of the MOS transistor Q2 is connected to the control terminal C2 of the power management module, and the drain electrode of the MOS transistor Q2 is connected to the positive power supply terminal of the battery compartment;

[0091] The negative power supply terminal of the battery compartment is connected to the power interface B- of the main control module.

[0092] As Figure 1 shown, the communication terminal X of each power management module is connected to the data terminal X1 of the main control module through a bus;

[0093] Each of the detection terminal 1, the detection terminal 2, and the detection terminal 3 of each power management module is preset with an ID identifier corresponding one-to-one to the battery compartment number; the ID identifier of the detection terminal 1 is ID01, and this ID01 corresponds to the battery compartment number 1#, the ID identifier of the detection terminal 2 is ID02, and this ID02 corresponds to the battery compartment number 2#, the ID identifier of the detection terminal 3 is ID03, and this ID03 corresponds to the battery compartment number 3#;

[0094] The detection terminal 1 of the power management module in the 1# battery compartment is the sampling terminal of the battery pack in the 1# battery compartment, and this sampling terminal is connected to the positive power supply terminal of the 1# battery compartment;

[0095] The detection terminal 2 of the power management module in the 2# battery compartment is the sampling terminal of the battery pack in the 2# battery compartment, and this sampling terminal is connected to the positive power supply terminal of the 2# battery compartment;

[0096] The detection terminal 3 of the power management module in the 3# battery compartment is the sampling terminal of the battery pack in the 3# battery compartment, and this sampling terminal is connected to the positive power supply terminal of the 3# battery compartment.

[0097] As Figure 1As shown, the main control module is provided with a power supply terminal B1, a charging terminal B2+, and a detection terminal J1. The power supply terminal B1 is connected to the load, the charging terminal B2+ is connected to the charging power supply, and the detection terminal J1 is connected to the ECU.

[0098] The three battery management modules are used to periodically obtain the remaining power S n , the allowable charging current I jn and the allowable discharge current I kn of their corresponding battery packs, and send them to the main control module respectively;

[0099] The main control module is used to calculate the available remaining driving power S, the maximum allowable charging current I n , the allowable charging current I jn and the allowable discharge current I kn of all battery packs, and calculate the available remaining driving power S, the maximum allowable charging current I j . max and the maximum allowable discharge current I. kmax .

[0100] The calculation formula for the available remaining driving power S is:

[0101] S = S - S0

[0102] where S is the total remaining power of all battery packs, and S0 is the power holding threshold;

[0103] where the calculation formula for the total remaining power S of all battery packs is:

[0104]

[0105] where n is the number of all battery compartments, and S n is the remaining power of the battery pack in the nth battery compartment;

[0106] The calculation formula for the maximum allowable charging current I j , max is:

[0107] I j , max = I jmax + I jmin (n - 1)

[0108] where I jmax is the maximum allowable charging current of a single battery pack, I jmin is the minimum allowable charging current of a single battery pack, and n is the number of all battery compartments;

[0109] where the calculation formula for the maximum allowable charging current I jmax of a single battery pack is:

[0110] I jmax = max 0～n I jn

[0111] where max 0～n is to find the maximum value among n battery compartments, max is the maximum value function, n is the number of all battery compartments, and I jn is the allowable charging current of the battery pack in the jth battery compartment among n battery compartments;

[0112] The minimum value I of the allowable charging current of a single battery pack jmin is calculated as follows:

[0113] I jmin = min 0～n I jn

[0114] where min 0～n is to find the minimum value among n battery compartments, min is the minimum value function, n is the number of all battery compartments, and I jn is the allowable charging current of the battery pack in the jth battery compartment among n battery compartments;

[0115] The maximum allowable discharge current I, kmax is calculated as follows:

[0116] I, kmax = I kmax + I kmin (n - 1)

[0117] where I kmax is the maximum value of the allowable discharge current of a single battery pack, I kmin is the minimum value of the allowable discharge current of a single battery pack, and n is the number of all battery compartments;

[0118] where the maximum value I of the allowable discharge current of a single battery pack kmax is calculated as follows:

[0119] I kmax = max 0～n I kn

[0120] where max 0～n is to find the maximum value among n battery compartments, max is the maximum value function, n is the number of all battery compartments, and I kn is the allowable discharge current of the battery pack in the kth battery compartment among n battery compartments;

[0121] The minimum value I of the allowable discharge current of a single battery pack kmin is calculated as follows:

[0122] I kmin = min 0～n I kn

[0123] where, min 0～n is to find the minimum value among n battery compartments, min is the minimum value function, n is the number of all battery compartments, and I kn is the allowable discharge current of the battery pack in the k-th battery compartment among n battery compartments.

[0124] Before starting the motor, the main control module determines whether the drive enable of all the battery packs is effective according to the available remaining power S in the above calculation result;

[0125] When the drive available remaining power S is not greater than 0, the drive enable is invalid, and the main control module issues a charging required prompt and waits for the charging power supply to be connected for charging;

[0126] When the drive available remaining power S is greater than 0, the drive enable is effective, and the main control module determines whether the parallel quick-change battery system is in a charging state;

[0127] When the main control module detects that a charging power supply is connected, the main control module charges the battery packs step by step according to the remaining power of all the battery packs;

[0128] The step-by-step charging is as follows:

[0129] The main control module preferentially sends a charging signal to the power management module corresponding to the battery pack with the least remaining power. The corresponding power management module controls the MOS tube Q1 in the corresponding battery pack to turn off and the MOS tube Q2 to turn on, and the battery pack with the least remaining power starts to charge;

[0130] When the remaining power of the battery pack with the least remaining power is the same as that of the battery pack with the second least remaining power, the main control module sends a charging signal to the power management module corresponding to the battery pack with the second least remaining power. The corresponding power management module controls the MOS tube Q1 in the corresponding battery pack to turn off and the MOS tube Q2 to turn on, and the two battery packs charge simultaneously;

[0131] The main control module controls the other battery packs to charge step by step according to the above operations;

[0132] The main control module controls the charging current of all the battery packs to be less than the maximum allowable charging current I j , max .

[0133] When the main control module does not detect that a charging power supply is connected, the main control module determines whether the output power of all the battery packs in parallel is less than the load drive power;

[0134] When the output power of the parallel-connected battery packs is greater than or equal to the load driving power, the main control module performs matching discharge according to the remaining power of all the battery packs.

[0135] The matching discharge is as follows:

[0136] The main control module preferentially selects a single battery pack or a combination of multiple battery packs for discharge in the battery pack with the most remaining power according to the requirements of the load driving power.

[0137] The main control module sends a discharge signal to the corresponding battery management module, and the corresponding battery management module controls the MOS tube Q1 of all the battery packs in a single battery pack or a combination of multiple battery packs to conduct, and the MOS tube Q2 to cut off, and the combined discharge drives the load.

[0138] The main control module controls the discharge current of all the battery packs to be less than the maximum allowable discharge current I. kmax 。

[0139] The combined discharge is as follows:

[0140] The main control module controls the output power of the discharge combination to meet the requirements of the load driving power through the duty cycle, and adjusts the discharge duration of each battery pack in the discharge combination to adjust the discharge duration of each battery pack in the discharge combination.

[0141] Among them, the discharge duration of the battery pack with a higher voltage is greater than that of the battery pack with a lower voltage.

[0142] The difference between the high voltage value and the set value: the difference between the low voltage value and the set value = the ratio of their discharge durations.

[0143] Set value = the voltage value of the lowest voltage battery pack - U a ,where U a is the difference between the average voltage value of all the battery packs in the discharge combination and the voltage value of the lowest voltage battery pack.

[0144] The relationship between the voltage value and the amount of power is a well-known common sense and will not be elaborated here.

[0145] When the output power of the parallel-connected battery packs is less than the load driving power, the main control module issues an alarm prompt.

[0146] The main control module detects whether there is an energy recovery trigger signal through the detection terminal J1;

[0147] If there is an energy recovery trigger signal, the main control module controls all the battery packs to be charged by step-by-step charging.

[0148] The master control module controls the recycling charging current to be less than or equal to the allowable charging current I of the battery pack with the lowest voltage. jn .

Claims

1. A parallel fast-switching battery positioning circuit, characterized in that, There are N battery compartments arranged in parallel with consistent structures. Each battery compartment is also provided with a battery pack. All the batteries in the battery pack have the same quantity, specification, and model. The positive electrodes of all the batteries are connected in parallel to form the positive power supply terminal of the battery compartment, and the negative electrodes of all the batteries are connected in parallel to form the negative power supply terminal of the battery compartment. The battery compartment is also provided with a communication terminal X and a sampling terminal; Among them, the positive power supply terminals of all the battery compartments are connected to the power interface B+ of the main control module through a power-off main switch K1, and the negative power supply terminals of all the battery compartments are connected to the power interface B- of the main control module; The data terminals X of all the battery compartments are connected to the data terminal X1 of the main control module through a bus; The sampling terminal of any one battery compartment is connected to the positive power supply terminal of its own battery compartment; The main control module is provided with a power supply terminal B1+ connected to a load, and the charging terminal B2+ of the main control module is connected to a charging power supply.

2. The parallel quick-change battery positioning circuit according to claim 1, wherein The main control module is also provided with a detection terminal J1, and this detection terminal J1 is connected to an ECU.

3. The parallel quick-change battery positioning circuit according to claim 1, wherein A power management module is provided in the battery compartment. The power management module is provided with M detection terminals, and each detection terminal is preset with an ID identifier, and the ID identifier corresponds one-to-one to the number of the battery compartment; Select 1 detection terminal with an ID identifier corresponding to the number of the battery compartment from the M detection terminals as the sampling terminal of the battery compartment; The data terminal X of the power management module is the data terminal X of the battery compartment.

4. The parallel quick-change battery positioning circuit according to claim 3, wherein The battery pack is connected with an MOS transistor Q1. The source electrode of this MOS transistor Q1 is connected to the positive power supply terminal of the battery compartment, the gate electrode of the MOS transistor Q1 is connected to the control terminal CTRL1 of the power management module, and the drain electrode of the MOS transistor Q1 is connected to the power-off main switch K1.

5. The parallel quick-change battery positioning circuit according to claim 4, characterized in that, The battery pack is connected with an MOS transistor Q2. The source electrode of this MOS transistor Q2 is connected to the power-off main switch K1, the gate electrode of the MOS transistor Q2 is connected to the control terminal CTRL2 of the power management module, and the drain electrode of the MOS transistor Q2 is connected to the positive power supply terminal of the battery compartment.

6. The parallel quick-change battery positioning circuit according to claim 4 or 5, characterized in that, All the battery packs have consistent structures and connection methods.

7. The parallel quick-change battery positioning circuit according to claim 1, characterized in that The bus is a CAN bus or a LIN bus.

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