Fault-tolerant reconfigurable battery pack and battery pack reconfiguration method based on wireless energy communication technology

Abstract

The present invention provides a fault-tolerant reconfigurable battery pack and a battery pack reconstruction method based on wireless energy communication technology. The reconstructed battery pack includes a plurality of square single cells arranged in an array and equipped with a secondary MCU. A secondary wireless energy communication simultaneous transmission device is provided on each surface of the single cell, and energy communication transmission is performed with a primary wireless energy communication simultaneous transmission device of an underwater charging base station. The primary wireless energy communication simultaneous transmission device is pre-installed with a database of voltage, current and number of single cells required for underwater equipment to perform different tasks. The primary wireless energy communication simultaneous transmission device can send control instructions to the secondary MCU according to the battery pack reconstruction requirements, control the secondary wireless energy communication simultaneous transmission device on any surface of the single cell to be turned on or off, and realize battery pack reconstruction. Based on the wireless energy communication simultaneous transmission technology, the present invention enables underwater equipment to dynamically reconstruct the battery pack according to the battery health status, timely eliminate faulty or poorly healthy single cells on site, and enable the reconstructed battery pack to continue to operate safely and efficiently during the underwater equipment's mission.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater charging, and in particular relates to a fault-tolerant reconfigurable battery pack and a battery pack reconfiguration method based on wireless energy communication technology. Background Art

[0002] The battery pack used in the energy system of traditional underwater equipment is composed of multiple single cells connected in a fixed series-parallel physical topology. During the service of underwater equipment, during the repeated charging and discharging process, each single cell will have different degrees of degradation characteristics. At the same time, overcharging and over-discharging problems may occur during the charging process, reducing the service life of the battery pack. If a single cell has a short circuit, open circuit or failure, it will affect the overall safety and energy efficiency of the battery pack, and the entire battery pack needs to be replaced when it is replaced.

[0003] Since the reconstructed battery pack can dynamically adjust the battery pack connection mode according to the working requirements of the underwater equipment and the status of the single battery, and timely remove and replace the faulty single battery, the reconstructed battery pack is currently an important way to solve the defects of fixed battery packs. However, the traditional reconstruction method of reconstructing the battery pack is to adjust the line connection mode between each single battery manually or by adding redundant mechanical structures to achieve battery pack reconstruction. There are problems such as interface exposure, corrosion, or repeated salvage and release. The battery pack reconstruction process is complicated, and it is impossible to achieve autonomous dynamic adjustment of the battery pack during the underwater equipment's mission. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing underwater reconfigurable battery pack reconstruction method, which is complicated and cannot realize autonomous dynamic adjustment of the battery pack when the underwater equipment performs tasks, and to provide a fault-tolerant reconfigurable battery pack and a battery pack reconstruction method based on wireless energy communication technology.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] The fault-tolerant reconfigurable battery pack based on wireless energy communication technology is composed of an array of several single cells, and the surfaces of adjacent single cells are in direct contact with each other; the single cell is a cubic structure, with a secondary MCU (abbreviation of Microcontroller Unit, the Chinese name is micro control unit) built in, and secondary wireless energy communication simultaneous transmission devices are provided on the six surfaces of the single cell; the secondary wireless energy communication simultaneous transmission device is used to transmit energy with the primary wireless energy communication simultaneous transmission device of the underwater charging base station;

[0007] The primary wireless energy signal transmission device can send a battery pack reconstruction instruction to the secondary MCU of the single battery according to the battery pack reconstruction requirements, and control the on and off of the secondary wireless energy signal transmission device on any two surfaces of the single battery to achieve battery pack reconstruction;

[0008] The primary wireless energy signal transmission device is pre-installed with a database of voltage, current and number of single batteries required for underwater equipment to perform different tasks.

[0009] Furthermore, the primary wireless energy signal transmission device includes a primary MCU, a primary isolation transformer, a primary modulation and demodulation module, a DC power supply, an inverter, a primary compensation circuit and a transmitting coil; the primary MCU, the primary isolation transformer and the primary modulation and demodulation module are connected in sequence, and the DC power supply, the inverter, the primary compensation circuit and the transmitting coil are connected in sequence; the primary modulation and demodulation module interacts with the primary compensation circuit to inject the data signal output by the primary MCU into the primary compensation circuit;

[0010] The voltage, current and number of single battery cells required by underwater equipment during different missions are preset in the primary MCU;

[0011] The secondary wireless energy signal transmission device includes a secondary isolation transformer, a secondary modulation and demodulation module, a receiving coil, a secondary compensation circuit and a rectifier; the secondary isolation transformer and the secondary modulation and demodulation module are connected to the secondary MCU in the single cell battery in sequence; the receiving coil, the secondary compensation circuit and the rectifier are connected in sequence, and the single cell battery is connected to the rectifier as a load battery; the secondary modulation and demodulation module interacts with the secondary compensation circuit to inject the data signal output by the secondary MCU into the secondary compensation circuit.

[0012] Furthermore, the primary MCU can control the primary isolation transformer to inject the data signal output by the primary MCU into the primary compensation circuit through the primary modulation and demodulation module in a high-order harmonic manner;

[0013] The secondary MCU of the single cell can control the secondary isolation transformer to inject the data signal output by the secondary MCU into the secondary compensation circuit through the secondary modulation and demodulation module in a high-order harmonic manner.

[0014] A battery pack reconstruction method for fault-tolerant reconstruction of a battery pack based on wireless energy communication technology comprises the following steps:

[0015] Step 1, establishing a database of voltage, current and number of single batteries required by underwater equipment during different missions, and embedding the database in the primary wireless energy signal transmission device;

[0016] Step 2, the secondary MCU of each single cell obtains the current voltage, current, temperature, internal resistance and capacity data information of the corresponding single cell, and transmits the data information to the primary wireless energy signal transmission device through the secondary wireless energy signal transmission device of each single cell;

[0017] Step 3, the primary wireless energy signal transmission device performs fault diagnosis on each single cell according to the received current voltage, current, temperature and capacity data information of the corresponding single cell. If it is determined to be a faulty battery, the location information of the faulty single cell is obtained; if it is determined to be a normal battery, the location information of the normal single cell is obtained and the process proceeds to step 4;

[0018] Step 4: Perform health status consistency assessment on all normal single cells according to the set requirements, and determine the single cells involved in reconstruction according to the number of single cells required for the underwater equipment to perform the mission and the health status consistency assessment results, and obtain the battery pack reconstruction plan;

[0019] Step 5, the primary wireless energy signal transmission device outputs a battery isolation instruction to the secondary MCU of each single cell according to the number and location information of the faulty single cell and the single cell whose health status does not meet the set requirements, cuts off the receiving coil of the faulty single cell and the single cell whose health status does not meet the set requirements, and isolates the faulty single cell and the single cell whose health status does not meet the set requirements;

[0020] Step 6. According to the battery pack reconstruction plan obtained in step 4, the primary wireless energy signal transmission device outputs a reconstruction instruction to the secondary MCUs of all the single cells participating in the reconstruction. The secondary MCUs of the single cells participating in the reconstruction output a conduction control signal and control the secondary wireless energy signal transmission devices on the corresponding surfaces of the single cells participating in the reconstruction to conduct the single cells participating in the reconstruction, thereby realizing the battery pack reconstruction.

[0021] Furthermore, in step 3, the process of performing fault diagnosis on each single battery is as follows:

[0022] Step 3.1, obtaining the safe voltage range, safe current range, safe temperature range and rated capacity of the single battery;

[0023] Step 3.2, obtain the current voltage, current, temperature and available capacity of the single battery, determine whether the current voltage, current and temperature are respectively within the safe voltage range, safe current range and safe temperature range, and determine whether the available capacity is higher than the set proportion of the rated capacity. If all are yes, it is a normal battery; if any one is no, it is a faulty battery.

[0024] Furthermore, the specific process of step 4 is as follows:

[0025] Step 4.1: Calculate the health status of each battery cell according to the formula :

[0026]

[0027] In the formula, is the internal resistance of the single battery at the end of its life, is the current internal resistance of the single battery, It is the internal resistance of the single battery when it leaves the factory;

[0028] Step 4.2, set the normal number of single cells to The normal number of cells required for reconstruction is and satisfy > , and classify each normal single cell according to its health status Sort in descending order and calculate any consecutive The variance of the health status of a normal single cell :

[0029]

[0030] In the formula, For any continuous The average health status of normal single cells, i=1, 2, 3, ..., ;

[0031] Step 4.3, select the continuous A normal single cell is used as a single cell participating in reconstruction to obtain a battery pack reconstruction plan.

[0032] Furthermore, in step 6, when there are disconnected faulty single cells and / or single cells whose health status does not meet the set requirements among the single cells participating in the reconstruction, the secondary wireless energy signal simultaneous transmission device of the disconnected faulty single cells and / or single cells whose health status does not meet the set requirements acts as a relay unit to transmit the conduction control signal received by the single cells participating in the reconstruction at the previous level to the single cells participating in the reconstruction at the next level until all the single cells participating in the reconstruction are turned on and working.

[0033] The advantages of the present invention are:

[0034] 1. The fault-tolerant reconfigurable battery pack designed by the present invention based on wireless energy communication technology includes a plurality of single cells arranged in an array, and each single cell is provided with a secondary wireless energy communication simultaneous transmission device on six surfaces, and a database of voltage, current and number of single cells required for underwater equipment to perform different tasks is pre-set in the primary MCU of the primary wireless energy communication simultaneous transmission device. Based on underwater wireless energy communication simultaneous transmission technology, the present invention enables underwater equipment to dynamically reconfigure the battery pack according to the health status of the single cells, timely eliminate faulty single cells in situ, and effectively prevent overcharging problems caused by inconsistent health status of single cells, reducing the impact of single cells with poor performance on the performance of the entire battery pack, so that the reconfigurable battery pack can operate safely and efficiently during the underwater equipment's mission.

[0035] 2. During the reconstruction of the battery pack of the present invention, the synchronous interaction of energy and data information can be achieved without physical contact, effectively avoiding problems such as contact sparks and interface exposure, and is not affected by severe weather such as rain, snow and storms. Combined with the underwater charging base station, the on-off control of each single battery is realized, avoiding the time-consuming and costly complex process of salvaging and launching underwater equipment to replace the battery pack after a traditional battery pack failure, realizing underwater in-situ energy replenishment and troubleshooting, and greatly improving the endurance, concealment and safety of underwater equipment underwater operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a fault-tolerant reconfigurable battery pack based on wireless energy communication technology of the present invention;

[0037] Figure 2 This is a schematic diagram of the fault-tolerant reconfigurable battery pack charging based on wireless energy communication technology of the present invention;

[0038] Figure 3 It is a diagram of the structure of the wireless simultaneous transmission system of the present invention;

[0039] Figure 4 It is a schematic diagram of adjusting the series-parallel connection mode of single cells by changing the access surface of the single cells in the present invention;

[0040] Figure 5 is a simplified flow chart of a battery pack reconstruction method for reconstructing a battery pack of the present invention;

[0041] Figure 6 It is a schematic diagram of the process of reconstructing the battery pack after eliminating the faulty single battery in the present invention;

[0042] Figure 7 It is a schematic diagram of the process of reconstructing a battery pack according to the consistency judgment result of a single battery in the present invention.

[0043] Explanation of the reference numerals: 1- secondary wireless communication and simultaneous transmission device, 2- primary wireless communication and simultaneous transmission device. DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0045] Reference Figure 1-Figure 2The fault-tolerant reconfigurable battery pack based on wireless energy communication technology is composed of an array of several single cells, and the surfaces of adjacent single cells are in direct contact; the single cell is a cubic structure with a built-in secondary MCU, and a secondary wireless energy communication simultaneous transmission device 1 is provided on the six surfaces of the single cell; the secondary wireless energy communication simultaneous transmission device is used to transmit energy with the primary wireless energy communication simultaneous transmission device 2 of the underwater charging base station.

[0046] The primary wireless energy communication simultaneous transmission device 2 can output a battery pack reconstruction instruction according to the battery pack reconstruction requirement, and the secondary wireless energy communication simultaneous transmission device on any two surfaces of the single cell battery can turn on or off the receiving coils on the two surfaces according to the battery pack reconstruction instruction to achieve battery pack reconstruction; the primary wireless energy communication simultaneous transmission device is pre-installed with a database of voltage, current and number of single cells required by underwater equipment during the execution of different tasks.

[0047] Reference Figure 3 The primary wireless energy signal transmission device includes a primary MCU, a primary isolation transformer, a primary modulation and demodulation module, a DC power supply, an inverter, a primary compensation circuit and a transmitting coil. The primary MCU, the primary isolation transformer and the primary modulation and demodulation module are connected in sequence, and the DC power supply, the inverter, the primary compensation circuit and the transmitting coil are connected in sequence. The primary modulation and demodulation module interacts with the primary compensation circuit to inject the data signal output by the primary MCU into the primary compensation circuit. The voltage, current and number of single cells required by the underwater equipment during the execution of different tasks are preset in the primary MCU.

[0048] The secondary wireless energy signal transmission device includes a secondary isolation transformer, a secondary modulation and demodulation module, a receiving coil, a secondary compensation circuit and a rectifier. The secondary isolation transformer and the secondary modulation and demodulation module are connected to the secondary MCU in the single cell battery in sequence, the receiving coil, the secondary compensation circuit and the rectifier are connected in sequence, and the single cell battery is connected to the rectifier as a load battery. The secondary modulation and demodulation module interacts with the secondary compensation circuit to inject the data signal output by the secondary MCU into the secondary compensation circuit. The secondary MCU of the single cell battery can control the secondary isolation transformer in a high-order harmonic manner to inject the data signal output by the secondary MCU into the secondary compensation circuit through the secondary modulation and demodulation module.

[0049] The primary MCU can control the primary isolation transformer to inject the data signal output by the primary MCU into the primary compensation circuit through the primary modulation and demodulation module in a high-order harmonic manner. At the same time, the DC power output by the DC power supply is processed by the inverter and then input into the primary compensation circuit to obtain a mixed signal of energy and data signals. The mixed signal is coupled to the secondary compensation circuit through the alternating electromagnetic field generated by the transmitting coil and the receiving coil. The mixed signal is separated from the data signal by the secondary modulation and demodulation module. The data signal is transmitted to the secondary MCU of the single cell through the secondary isolation transformer, and the energy is transmitted to the single cell after rectification by the rectifier.

[0050] Reference Figure 4 , define the left and right sides of the single cell as side A and side B, and the upper and lower sides as side C and side D. According to the battery pack reconstruction requirements, the secondary MCU outputs a control signal to control the receiving coils on the two sides of the single cell to be turned on: if the receiving coils on the A and B sides of each single cell are turned on, a series-parallel structure is formed in which adjacent single cells are connected in series along the A and B sides, and in parallel along the C and D sides; if the receiving coils on the C and D sides of each single cell are turned on, a series-parallel structure is formed in which adjacent single cells are connected in series along the C and D sides, and in parallel along the A and B sides. Figure 4 Taking the reconstruction process as an example, in actual work, the series-parallel connection form of the single cell is adjusted by adjusting the connection surface of the single cell to achieve the reconstruction of the battery pack.

[0051] Reference Figure 5 A battery pack reconstruction method for fault-tolerant reconstruction of a battery pack based on wireless energy communication technology comprises the following steps:

[0052] Step 1: Establish a database of voltage, current and number of single cells required by underwater equipment during different missions, and embed the database into the primary MCU of the primary wireless energy signal transmission device.

[0053] Step 2: The secondary MCU of each single cell obtains the current voltage, current, temperature, internal resistance and capacity data information of the corresponding single cell, and transmits the data information to the primary wireless energy communication device through the secondary wireless energy communication device of each single cell.

[0054] In step 3, the primary wireless energy signal transmission device performs fault diagnosis on each single cell according to the received current voltage, current, temperature and capacity data information of the corresponding single cell. If it is judged to be a faulty battery, the location information of the faulty single cell is obtained; if it is judged to be a normal battery, the location information of the normal single cell is obtained and the process goes to step 4.

[0055] When the voltage of a single cell is not within the safe range, the single cell may have overvoltage or low voltage problems during charging; when the battery temperature exceeds the safe temperature range, it may cause thermal runaway problems; at the same time, when the available capacity of a single cell is lower than a certain percentage of the rated capacity, the single cell is considered to have aged. Therefore, it is necessary to perform fault diagnosis on each single cell. The specific process is as follows:

[0056] Step 3.1, obtain the safe voltage range, safe current range, safe temperature range and rated capacity of the single battery.

[0057] Step 3.2, obtain the current voltage, current, temperature and available capacity of the single battery, determine whether the current voltage, current and temperature are respectively within the safe voltage range, safe current range and safe temperature range, and determine whether the available capacity is higher than the set proportion of the rated capacity. If all are yes, it is a normal battery; if any one is no, it is a faulty battery.

[0058] In this embodiment, when the available capacity of the battery is less than 80% of the rated capacity, the battery is considered to be aged.

[0059] Step 4: Perform health status consistency assessment on all normal single cells according to the set requirements, determine the single cells involved in the reconstruction according to the number of single cells required for the underwater equipment to perform the mission and the health status consistency assessment results, and obtain the battery pack reconstruction plan. The specific process is as follows:

[0060] Step 4.1: Calculate the health status of each normal single cell according to the following formula: ,

[0061]

[0062] In the formula, is the internal resistance of the single battery at the end of its life, is the current internal resistance of the single battery, It is the internal resistance of the single battery when it leaves the factory.

[0063] Step 4.2, set the normal number of single cells to The normal number of cells required for reconstruction is and satisfy > , and classify each normal single cell according to its health status Sort in descending order and calculate any consecutive The variance of the health status of a normal single cell :

[0064]

[0065] In the formula, is the average health status of any consecutive n normal single cells, i=1, 2, 3, ..., .

[0066] Step 4.3, select the continuous A normal single cell is used as a single cell participating in reconstruction to obtain a battery pack reconstruction plan.

[0067] Step 5, the primary wireless energy signal transmission device outputs a battery isolation instruction to the secondary MCU of each single cell according to the number and position information of the faulty single cell and the single cell whose health status does not meet the set requirements, cuts off the receiving coil of the faulty single cell and the single cell whose health status does not meet the set requirements, and isolates the faulty single cell and the single cell whose health status does not meet the set requirements.

[0068] Step 6. According to the battery pack reconstruction plan obtained in step 4, the primary wireless energy signal transmission device outputs a reconstruction instruction to the secondary MCUs of all the single cells participating in the reconstruction. The secondary MCUs of the single cells participating in the reconstruction output a conduction control signal and control the secondary wireless energy signal transmission devices on the corresponding surfaces of the single cells participating in the reconstruction to conduct the single cells participating in the reconstruction, thereby realizing the battery pack reconstruction.

[0069] When there are faulty single cells that are cut off and / or single cells whose health status does not meet the set requirements among the single cells participating in the reconstruction, although the receiving coils of the faulty single cells and the single cells whose health status does not meet the set requirements cannot work normally, the secondary compensation circuits of the faulty single cells that are cut off and / or the single cells whose health status does not meet the set requirements will act as relay units and can still realize the relay function, transmitting the conduction control signals received by the single cells participating in the reconstruction at the previous level to the single cells participating in the reconstruction at the next level until all the single cells participating in the reconstruction are turned on and working.

[0070] like Figure 6 As shown in Figure 1, when a battery fails, the primary MCU controls to skip the failed battery and connect the normal redundant battery to the battery pack. At the same time, when a single battery with poor consistency appears, the primary MCU will also control to skip the single battery with poor consistency and use the normal redundant battery with good consistency to replace the battery with large consistency deviation in the branch, such as Figure 7 During the battery pack reconstruction process, the secondary compensation circuit of the faulty single cell or the single cell with poor consistency will be connected to the next normal single cell as a relay unit, and there is no energy consumption in the skipped faulty single cell or the single cell with poor consistency, and only the data information of the two normal single cells that need to participate in the reconstruction are transmitted by means of its secondary compensation circuit.

[0071] The method of the present invention can effectively prevent and deal with battery pack failure problems. The consistency assessment of the health status of the single cell before reconstruction can effectively solve the problems of overcharging and life reduction of the single cell. When a single cell fails, it can be replaced with a normal redundant battery in time, avoiding the cumbersome process of replacing single cells by salvaging underwater equipment in the traditional battery pack reconstruction method, shortening the reconstruction time of the battery pack and reducing the reconstruction cost of the battery pack.

[0072] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A fault-tolerant reconfigurable battery pack based on wireless energy communication technology, characterized in that: The fault-tolerant reconfigurable battery pack is composed of an array of a plurality of single cells, and the surfaces of adjacent single cells are in direct contact with each other; The single cell battery is a cubic structure with a built-in secondary MCU, and secondary wireless energy signal transmission devices are provided on the six surfaces of the single cell battery; The secondary wireless energy signal transmission device is used to transmit energy signals with the primary wireless energy signal transmission device of the underwater charging base station; The primary wireless energy signal transmission device can send a battery pack reconstruction instruction to the secondary MCU of the single battery according to the battery pack reconstruction requirements, and control the on and off of the secondary wireless energy signal transmission device on any two surfaces of the single battery to achieve battery pack reconstruction; The primary wireless energy signal transmission device is pre-installed with a database of voltage, current and number of single batteries required for underwater equipment to perform different tasks.

2. According to claim 1, the fault-tolerant reconfigurable battery pack based on wireless energy communication technology is characterized in that: The primary wireless energy signal transmission device includes a primary MCU, a primary isolation transformer, a primary modulation and demodulation module, a DC power supply, an inverter, a primary compensation circuit and a transmitting coil; the primary MCU, the primary isolation transformer and the primary modulation and demodulation module are connected in sequence, and the DC power supply, the inverter, the primary compensation circuit and the transmitting coil are connected in sequence; the primary modulation and demodulation module interacts with the primary compensation circuit to inject the data signal output by the primary MCU into the primary compensation circuit; The voltage, current and number of single battery cells required by underwater equipment during different missions are preset in the primary MCU; The secondary wireless energy signal transmission device includes a secondary isolation transformer, a secondary modulation and demodulation module, a receiving coil, a secondary compensation circuit and a rectifier; the secondary modulation and demodulation module is connected to the secondary MCU in the single cell battery through the secondary isolation transformer; the receiving coil, the secondary compensation circuit and the rectifier are connected in sequence, and the single cell battery is connected to the rectifier as a load battery; the secondary modulation and demodulation module interacts with the secondary compensation circuit to inject the data signal output by the secondary MCU into the secondary compensation circuit.

3. According to claim 2, the fault-tolerant reconfigurable battery pack based on wireless energy communication technology is characterized in that: The primary MCU can control the primary isolation transformer to inject the data signal output by the primary MCU into the primary compensation circuit through the primary modulation and demodulation module in a high-order harmonic manner; The secondary MCU of the single cell can control the secondary isolation transformer to inject the data signal output by the secondary MCU into the secondary compensation circuit through the secondary modulation and demodulation module in a high-order harmonic manner.

4. The battery pack reconstruction method for fault-tolerant reconstruction of a battery pack based on wireless energy communication technology according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, establishing a database of voltage, current and number of single batteries required by underwater equipment during different missions, and embedding the database in the primary wireless energy signal transmission device; Step 2, the secondary MCU of each single cell obtains the current voltage, current, temperature, internal resistance and capacity data information of the corresponding single cell, and transmits the data information to the primary wireless energy signal transmission device through the secondary wireless energy signal transmission device of each single cell; Step 3, the primary wireless energy signal transmission device performs fault diagnosis on each single cell according to the received current voltage, current, temperature and capacity data information of the corresponding single cell, and if it is determined to be a faulty battery, obtains the location information of the faulty single cell; If it is determined to be a normal battery, the location information of the normal single battery is obtained and the process goes to step 4; Step 4: Perform health status consistency assessment on all normal single cells according to the set requirements, and determine the single cells involved in reconstruction according to the number of single cells required for the underwater equipment to perform the mission and the health status consistency assessment results, and obtain the battery pack reconstruction plan; Step 5, the primary wireless energy signal transmission device outputs a battery isolation instruction to the secondary MCU of each single cell according to the number and location information of the faulty single cell and the single cell whose health status does not meet the set requirements, cuts off the receiving coil of the faulty single cell and the single cell whose health status does not meet the set requirements, and isolates the faulty single cell and the single cell whose health status does not meet the set requirements; Step 6. According to the battery pack reconstruction plan obtained in step 4, the primary wireless energy signal transmission device outputs a reconstruction instruction to the secondary MCUs of all the single cells participating in the reconstruction. The secondary MCUs of the single cells participating in the reconstruction output a conduction control signal and control the secondary wireless energy signal transmission devices on the corresponding surfaces of the single cells participating in the reconstruction to conduct the single cells participating in the reconstruction, thereby realizing the battery pack reconstruction.

5. The battery pack reconstruction method according to claim 4, characterized in that: In step 3, the specific process of performing fault diagnosis on each single battery is as follows: Step 3.1, obtaining the safe voltage range, safe current range, safe temperature range and rated capacity of the single battery; Step 3.2, obtain the current voltage, current, temperature and available capacity of the single battery, determine whether the current voltage, current and temperature are respectively within the safe voltage range, safe current range and safe temperature range, and determine whether the available capacity is higher than the set proportion of the rated capacity. If all are yes, it is a normal battery; if any one is no, it is a faulty battery.

6. The battery pack reconstruction method according to claim 4, characterized in that: The specific process of step 4 is as follows: Step 4.1, calculate the health status SOH of each normal single cell according to the formula: In the formula, R EOL is the internal resistance of the single battery at the end of its life, R curr is the current internal resistance of the single battery, R new It is the internal resistance of the single battery when it leaves the factory; Step 4.2, set the number of normal single cells to m, the number of normal single cells required for reconstruction to n, and satisfy m>n; sort the normal single cells in descending order of health status SOH, and calculate the variance s of the health status of any consecutive n normal single cells according to the formula: Where, μ is the average health status of any consecutive n normal single cells, i = 1, 2, 3, ..., n; Step 4.3, select n consecutive normal single cells with the smallest variance as the single cells participating in the reconstruction, and obtain the battery pack reconstruction plan.

7. The battery pack reconstruction method according to claim 4, characterized in that: In step 6, when there are disconnected faulty single cells and / or single cells whose health status does not meet the set requirements among the single cells participating in the reconstruction, the secondary wireless energy signal transmission device of the disconnected faulty single cells and / or single cells whose health status does not meet the set requirements acts as a relay unit to transmit the conduction control signal received by the single cells participating in the reconstruction at the previous level to the single cells participating in the reconstruction at the next level until all the single cells participating in the reconstruction are turned on and working.

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