Battery module discharge calibration device and battery module discharge calibration method

Abstract

The application discloses a battery module discharging calibration device and a battery module discharging calibration method. The battery module discharging calibration device comprises a battery module interface, a load component and an electric control component. The battery module interface is used for connecting a battery module. The load component is electrically connected with the battery module interface. The load component is used for consuming the electric energy output by the battery module when the battery module is connected to the battery module interface. The communication end of the electric control component is connected with the battery module interface, and the control end of the electric control component is connected with the load component. The electric control component is used for acquiring the parameters of the battery cell in the battery module when the battery module is connected to the battery module interface, and controlling the load component to consume the electric energy output by the battery module according to the parameters of the battery cell. The electric control component is further used for adjusting the output current of the battery module according to the parameters of the battery cell when the voltage of the battery module reaches the preset voltage threshold according to the parameters of the battery cell, and calibrating the SOC of the connected battery module. The application can solve the problem that the existing calibration device is complicated to use.

Description

Battery module discharge calibration device and battery module discharge calibration method Technical Field

[0001] This invention relates to the field of battery module technology, and in particular to a battery module discharge calibration device and a battery module discharge calibration method. Background Technology

[0002] During maintenance, replacement, and replenishment of battery modules, inconsistencies in State of Charge (SOC) may occur between old and new modules. The system cannot determine the precise SOC value of the new module. If the new module is directly added to the existing system, significant SOC deviations in the cells will occur, and due to the "weakest link" effect, the battery's true capacity cannot be fully utilized. Therefore, operators typically use calibration equipment to calibrate the SOC of the battery modules to ensure their normal battery capacity. However, existing calibration equipment has many components and a complex structure, resulting in numerous and complex connection cables between the calibration equipment and the battery module, making operation difficult and unsuitable for non-professionals. Summary of the Invention

[0003] The main objective of this invention is to provide a battery module discharge calibration device, which aims to solve the problem of the complexity of using existing calibration devices.

[0004] To achieve the above objectives, the present invention provides a battery module discharge calibration device, comprising:

[0005] Battery module interface, used to connect to the battery module;

[0006] A load component, which is electrically connected to the battery module interface, is used to consume the electrical energy output by the battery module when the battery module is connected to the battery module interface.

[0007] An electronic control component, wherein the communication terminal of the electronic control component is connected to the interface of the battery module, and the control terminal of the electronic control component is connected to the load component, the electronic control component is used to obtain the cell parameters in the battery module when the battery module is connected to the interface of the battery module, and control the load component to consume the electrical energy output by the battery module according to the cell parameters;

[0008] The electronic control component is also used to adjust the output current of the battery module according to the cell parameters when the voltage of the battery module reaches a preset voltage threshold, and to perform SOC calibration on the connected battery module.

[0009] Optionally, the load component includes multiple electrical loads and multiple switching transistors, the multiple electrical loads are connected in parallel, each switching transistor is connected in series with one electrical load, and the controlled terminal of each switching transistor is connected to the electrical control component.

[0010] The electronic control component is also used to determine the maximum output current of the battery module based on the cell parameters, and to control the corresponding switch in the load component to turn on based on the determined maximum output current, so as to connect the corresponding number of electrical loads to the battery module.

[0011] Optionally, the electronic control component is further configured to, when the cell voltage of the battery module is determined to reach a preset voltage threshold based on the cell parameters, control the corresponding switching transistor in the load component to successively disconnect the connection between the electrical load and the battery module according to the cell voltage, so as to gradually reduce the output current of the battery module and perform SOC calibration on the connected battery module.

[0012] Optionally, the electronic control component is further configured to control the load component to stop consuming the electrical energy output by the battery module and calibrate the SOC value of the battery module to the initial value when the cell voltage of the battery module is determined to be less than or equal to the termination voltage value based on the cell parameters.

[0013] Optionally, the electronic control component includes:

[0014] The main controller has a communication terminal connected to the battery module interface and a control terminal connected to the load component. The main controller is used to obtain the cell parameters in the battery module when the battery module is connected to the battery module interface, and control the load component to consume the electrical energy output by the battery module according to the cell parameters.

[0015] A voltage detection circuit is provided, wherein the input terminal of the voltage detection circuit is connected to the battery module interface, and the output terminal of the voltage detection circuit is connected to the main controller. The voltage detection circuit is used to detect the battery voltage of the battery module when the battery module is connected to the battery module interface, and output the corresponding battery voltage detection signal to the main controller.

[0016] The main controller is also used to perform OCV calibration on the connected battery module based on the battery voltage detection signal.

[0017] Optionally, the battery module discharge calibration device further includes:

[0018] A microcircuit breaker is connected in series between the battery module interface and the load component. The microcircuit breaker is used to control the electrical connection between the battery module interface and the load component when it is turned on.

[0019] The shunt trip unit is electrically connected to the electrical control component, and the shunt trip unit is linked to the microcircuit breaker.

[0020] The electronic control component is also used to determine, based on the cell parameters, when the cell voltage in the battery module is lower than the termination voltage value, to control the shunt trip unit to conduct, thereby controlling the microcircuit breaker to turn off.

[0021] Optionally, the battery module discharge calibration device further includes:

[0022] An undervoltage protection circuit is provided, wherein the input terminal of the undervoltage protection circuit is connected to the battery module interface, and the output terminal of the undervoltage protection circuit is connected to the main controller. The undervoltage protection circuit is used to detect the battery voltage of the battery module when the battery module is connected to the battery module interface, and outputs an undervoltage protection signal to the main controller when it is determined that the battery module is undervoltage, so that the main controller controls the shunt trip to conduct, thereby controlling the microcircuit breaker to turn off.

[0023] Optionally, the battery module discharge calibration device further includes:

[0024] A voltage conversion circuit is provided, wherein the input terminal of the voltage conversion circuit is connected to the battery module interface, and the output terminal of the voltage conversion circuit is connected to the electronic control component. The voltage conversion circuit is used to convert the voltage output by the battery module into a power supply voltage and output it to the electronic control component when the battery module is connected to the battery module interface, so as to power the electronic control component.

[0025] Optionally, the battery module discharge calibration device further includes:

[0026] A cooling fan, wherein the controlled end of the cooling fan is connected to the electronic control component;

[0027] A temperature detection module is connected to the electronic control component. The temperature detection module is used to detect the temperature of the load component and the air outlet of the cooling fan, and output a corresponding temperature detection signal so that the electronic control component controls the cooling fan to work and / or controls the corresponding switch in the load component to turn on, thereby adjusting the output current of the battery module.

[0028] Optionally, the temperature detection module includes:

[0029] A first temperature sensor is connected to the electronic control component. The first temperature sensor is used to detect the temperature of the load component and output a corresponding first temperature detection signal so that the electronic control component controls the cooling fan to work according to the first temperature detection signal to dissipate heat from the load component.

[0030] A second temperature sensor is disposed at the air outlet of the cooling fan. The second temperature sensor is connected to the electronic control component. The second temperature sensor is used to detect the temperature at the air outlet of the cooling fan and output a corresponding second temperature detection signal, so that the electronic control component controls the corresponding switch in the load component to conduct according to the first temperature detection signal and the second temperature detection signal, thereby adjusting the output current of the battery module.

[0031] Optionally, the battery module discharge calibration device further includes:

[0032] A main switch circuit is connected in series between the load component and the battery module interface. The controlled terminal of the main switch circuit is connected to the electronic control component. The main switch circuit is used to control the electrical connection between the load component and the battery module interface when it is turned on.

[0033] This invention also proposes a battery module discharge calibration method, based on the aforementioned battery module discharge calibration device, characterized in that it includes:

[0034] Obtain the cell parameters in the battery module, and control the load components to consume the electrical energy output by the battery module based on the cell parameters;

[0035] When the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the output current of the battery module is adjusted according to the cell parameters, and the SOC calibration of the connected battery module is performed.

[0036] When the cell voltage of the battery module is determined to be less than or equal to the termination voltage value based on the cell parameters, the load component is controlled to stop consuming the electrical energy output by the battery module, and the SOC value of the battery module is calibrated to the initial value.

[0037] Optionally, the step of obtaining the cell parameters in the battery module and controlling the load components to consume the electrical energy output by the battery module based on the cell parameters includes:

[0038] Obtain the cell parameters in the battery module, determine the maximum output current of the battery module based on the cell parameters, and control the corresponding switch in the load component to turn on based on the determined maximum output current, so as to connect the corresponding number of electrical loads to the battery module.

[0039] The cell voltage of the battery module is determined based on the cell parameters, and the output current of the battery module is adjusted according to the cell voltage.

[0040] Optionally, when the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the steps of adjusting the output current of the battery module according to the cell parameters and performing SOC calibration on the connected battery module are as follows:

[0041] When the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the corresponding switch in the load assembly is disconnected from the electrical load and the battery module one by one according to the cell voltage control, so as to gradually reduce the output current of the battery module and perform SOC calibration on the connected battery module.

[0042] In this invention, by setting up a battery module interface, a load component, and an electronic control component, when a battery module is connected to the battery module interface, the electronic control component can perform discharge SOC calibration on the connected battery module based on the acquired cell parameters, thus realizing the SOC calibration function. The battery module discharge calibration device of this invention has only one battery module interface, making the connection method simple and the operation easy. Even non-professionals can quickly learn to use it, reducing the complexity of the battery module discharge calibration device, improving its applicability, and solving the problem of complex use of existing calibration devices. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0044] Figure 1 is a schematic diagram of the functional modules of an embodiment of the battery module discharge calibration device of the present invention;

[0045] Figure 2 is a functional module schematic diagram of another embodiment of the battery module discharge calibration device of the present invention;

[0046] Figure 3 is a functional module schematic diagram of another embodiment of the battery module discharge calibration device of the present invention;

[0047] Figure 4 is a schematic diagram of the circuit structure of an embodiment of the battery module discharge calibration device of the present invention;

[0048] Figure 5 is a schematic diagram of an embodiment of the battery module discharge calibration device of the present invention;

[0049] Figure 6 is a flowchart of an embodiment of the battery module discharge calibration method of the present invention;

[0050] Figure 7 is a detailed flowchart of an embodiment of the battery module discharge calibration method of the present invention;

[0051] Figure 8 is a detailed flowchart of another embodiment of the battery module discharge calibration method of the present invention.

[0052] Explanation of icon numbers:

[0053] Label Name 10 Battery Module Interface 90 Voltage Conversion Circuit 20 Load Component 100 Main Switch Circuit 30 Electronic Control Component 31 Main Controller 40 Micro Circuit Breaker 32 Voltage Detection Circuit 50 Shunt Trip Unit 33 Undervoltage Protection Circuit 60 First Temperature Sensor R1~R6 First Resistor~Sixth Resistor 70 Cooling Fan Q1~Q6 First Switching Transistor~Sixth Switching Transistor 80 Second Temperature Sensor surface

[0054] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0057] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0058] This invention proposes a battery module discharge calibration device.

[0059] Currently, existing calibration equipment has a complex structure, which leads to complicated connection methods between the calibration equipment and the battery module, making it difficult to operate and unsuitable for non-professionals.

[0060] To address the above problems, referring to Figures 1 to 3, in one embodiment, the battery module discharge calibration device includes:

[0061] Battery module interface 10 is used to connect a battery module;

[0062] A load component 20 is electrically connected to the battery module interface 10. The load component 20 is used to consume the electrical energy output by the battery module when the battery module is connected to the battery module interface 10.

[0063] The electronic control component 30 has a communication terminal connected to the battery module interface 10 and a control terminal connected to the load component 20. The electronic control component 30 is used to obtain the cell parameters in the battery module when the battery module is connected to the battery module interface 10, and control the load component 20 to consume the electrical energy output by the battery module according to the cell parameters.

[0064] The electronic control component 30 is also used to adjust the output current of the battery module according to the cell parameters when the voltage of the battery module reaches a preset voltage threshold, and to perform SOC calibration on the connected battery module.

[0065] In this embodiment, the load component 20 can be implemented using multiple electrical loads and switching transistors, with the multiple electrical loads connected in parallel and each electrical load connected in series with a switching transistor controlled by the electronic control component 30. With this configuration, the electronic control component 30 can control the load component 20 to consume the electrical energy output from the battery module by controlling the corresponding switching transistors to conduct, and can also change the number of electrical loads connected to the battery module by controlling the corresponding switching transistors to conduct / turn off, thereby adjusting the output current of the battery module, i.e., changing the discharge rate of the battery module. The electronic control component 30 can be implemented using a microprocessor such as a microcontroller, FPGA, or CPLD to achieve overall control of the battery module discharge calibration device.

[0066] After the battery module is connected to the battery module interface 10, the electronic control component 30 can establish a communication connection with the battery management unit (BMU) in the battery module and obtain the cell parameters of the battery module from the BMU, such as the SOC value, cell voltage, and cell discharge rate. After the battery module is connected to the battery module interface 10, the electronic control component 30 can control the switching transistor in the load component 20 to conduct, so that the electrical load is electrically connected to the battery module to consume the electrical energy output by the battery module. This allows the battery module's electrical energy to quickly reach the end of discharge, enabling the electronic control component 30 to perform SOC calibration on the battery module. During the discharge process of the battery module, the electronic control component 30 can determine the SOC value of the battery module based on the obtained cell parameters, such as the cell voltage, using methods such as ampere-hour integration or static lookup tables, to calibrate the SOC value of the battery module.

[0067] It is understandable that when the SOC value of the battery module is between 10% and 90%, the cell voltage of the battery module is in a plateau period with small voltage changes. However, at the end of the charging or discharging process, i.e., when the SOC value is between 0% and 10% or between 90% and 100%, the voltage changes are very significant due to the characteristics of the cells. This makes it easier to determine the correspondence between the voltage value and the SOC value. The SOC calibration value at this time can be regarded as the true SOC value, thereby achieving the purpose of SOC calibration. Therefore, in this embodiment, when the battery module's cell voltage reaches the SOC value at the end of the discharge process based on the cell parameters, i.e., a preset voltage threshold, the electronic control component 30 starts SOC calibration of the battery module, which can improve the accuracy of SOC calibration.

[0068] Furthermore, when the battery module voltage reaches a preset voltage threshold based on the cell parameters, the electronic control component 30, which is the State of Charge (SOC) value at the end of the discharge process (i.e., when the battery module discharges to 10% or below the SOC value), can control the corresponding switch in the load component 20 to turn on / off, gradually reducing the number of connected electrical loads. This causes the output current of the battery module to gradually decrease, thereby slowing down the rate of voltage drop in the cell. This protects the cell while achieving higher SOC calibration accuracy. The electronic control component 30 can gradually reduce the output current of the battery module based on the acquired cell voltage. When the cell voltage drops to the termination voltage value, it controls the switch in the load component 20 to turn off, stopping the battery module from discharging. The termination voltage value can be set to the voltage at which the battery module is fully discharged, or it can be set according to actual calibration requirements. Thus, when the cell voltage of the battery module drops to the termination voltage value, it can be considered that the battery module is fully discharged. At this point, the electronic control module calibrates the SOC value of the battery module to the starting value, that is, the SOC value corresponding to the full discharge of the battery module, completing the SOC calibration of the battery module and controlling the battery module to stop discharging. Furthermore, controlling the battery module to stop discharging when the cell voltage drops to the termination voltage value also serves as undervoltage protection, effectively preventing damage to the battery module due to undervoltage and improving the safety and stability of discharge calibration.

[0069] In this invention, by setting up a battery module interface 10, a load component 20, and an electronic control component 30, when a battery module is connected to the battery module interface 10, the electronic control component 30 can perform discharge SOC calibration on the connected battery module based on the acquired cell parameters, thus realizing the SOC calibration function. The battery module discharge calibration device of this invention has only one battery module interface 10, making the connection simple and operation easy. Even non-professionals can quickly learn to use it, reducing the complexity of the battery module discharge calibration device and improving its applicability. Simultaneously, the battery module discharge calibration device of this invention calibrates the battery module at the discharge end, effectively improving the accuracy of SOC calibration, extending the service life of the calibrated battery module, and improving the practicality and stability of the battery module discharge calibration device.

[0070] Referring to Figures 1 to 3, in one embodiment, the load component 20 includes a plurality of electrical loads and a plurality of switching transistors. The plurality of electrical loads are connected in parallel, each switching transistor is connected in series with one of the electrical loads, and the controlled terminal of each switching transistor is connected to the electrical control component 30.

[0071] The electronic control component 30 is also used to determine the maximum output current of the battery module according to the cell parameters, and to control the corresponding switch in the load component 20 to conduct according to the determined maximum output current, so as to connect the corresponding number of electrical loads to the battery module.

[0072] It is understood that the electronic control component 30 can communicate with the connected battery module through the battery module interface 10 and obtain the battery module's cell parameters, such as the maximum charge / discharge rate of the cell, i.e., the maximum charge output current of the cell. Therefore, in one embodiment, the electronic control component 30 can also determine the maximum output current of the battery module through the obtained cell parameters and control the corresponding switch in the load component 20 to turn on. By controlling the number of connected electrical loads, the battery module can discharge at its maximum output current. For example, as shown in Figure 4, which is a circuit structure diagram of an embodiment of the load component 20, the load component 20 includes six load resistors and six switch transistors. When the output voltage of the battery module is constant, changing the total resistance value of the load component 20 can change the output current of the battery module. Therefore, the electronic control component 30 can change the total resistance of the load component 20 by controlling different numbers of switch transistors to turn on, thereby changing the output current of the battery module. For example, when the resistance of each load resistor is 12Ω, the output voltage of the battery module is 24V, and its maximum output current is 6A, the total resistance of the corresponding load component 20 is 4Ω. This means that when the electronic control component 30 controls three of the switching transistors to conduct, the output current of the battery module can reach its maximum. This configuration, using the battery module's maximum current for discharge, accelerates the discharge speed, allowing the battery module to quickly discharge to the end of its discharge cycle. This enables rapid SOC calibration and improves the calibration efficiency of the battery module discharge calibration device.

[0073] Referring to Figures 1 to 3, in one embodiment, the electronic control component 30 is further configured to, when the voltage of the battery module is determined to reach a preset voltage threshold based on the cell parameters, control the corresponding switching transistor in the load component 20 to successively disconnect the connection between the electrical load and the battery module according to the cell voltage, so as to gradually reduce the output current of the battery module and perform SOC calibration on the connected battery module.

[0074] During the discharge process of the battery module, the cell voltage in the battery module gradually decreases as the discharge progresses. Therefore, in one embodiment, the electronic control component 30 can also determine the cell voltage of the battery module based on the cell parameters, and control the corresponding switch in the load component 20 to turn on / off according to the cell voltage, so as to gradually reduce the number of connected electrical loads, thereby gradually reducing the output current of the battery module and slowing down the rate of decrease in cell voltage, thus protecting the cells. Referring to Figure 4, which is a circuit structure diagram of an embodiment of the load component 20, the load component 20 includes six load resistors and six switches. When the output voltage of the battery module is constant, changing the total resistance value of the load component 20 can change the output current of the battery module. Therefore, the electronic control component 30 can change the total resistance of the load component 20 by controlling the conduction of different numbers of switches, thereby changing the output current of the battery module and realizing the function of regulating the output current of the battery module. For example, when five switching transistors are turned on, the electronic control component 30 controls any one of them to turn off, thereby increasing the total resistance of the load component 20 and reducing the output current of the battery module. Therefore, the electronic control component 30 can turn off multiple on switching transistors in the load component 20 one by one according to the cell voltage, gradually reducing the output current of the battery module. With this configuration, when the battery module discharges to the end of its discharge cycle, the electronic control component 30 performs SOC calibration while gradually reducing the output current of the battery module according to the cell voltage. This not only protects the cells but also improves the accuracy of SOC calibration, enhancing the safety and calibration accuracy of the battery module discharge calibration device.

[0075] The electronic control component is also used to control the load component to stop consuming the electrical energy output by the battery module and to calibrate the SOC value of the battery module to the initial value when the cell voltage of the battery module is determined to be less than or equal to the termination voltage value based on the cell parameters.

[0076] Furthermore, a termination voltage value can be set. When the cell voltage of the battery module drops to the termination voltage value, all switches in the load assembly 20 are turned off, causing the battery module to stop discharging. The termination voltage value can be set to the voltage value when the battery module is fully discharged, or it can be set according to actual calibration requirements. Thus, when the cell voltage of the battery module drops to the termination voltage value, it can be considered that the battery module is fully discharged. At this time, the electronic control module calibrates the SOC value of the battery module to the starting value, that is, the SOC value corresponding to the full discharge of the battery module, completing the SOC calibration of the battery module and controlling the battery module to stop discharging. In addition, controlling the battery module to stop discharging when the cell voltage of the battery module drops to the termination voltage value can also play a role in undervoltage protection, effectively preventing the battery module from being damaged due to undervoltage, and improving the safety and stability of discharge calibration.

[0077] Referring to Figures 1 to 3, in one embodiment, the electronic control component 30 includes:

[0078] The main controller 31 has a communication terminal connected to the battery module interface 10 and a control terminal connected to the load component 20. The main controller 31 is used to obtain the cell parameters in the battery module when the battery module is connected to the battery module interface 10, and to control the load component 20 to consume the electrical energy output by the battery module according to the cell parameters.

[0079] A voltage detection circuit 32 is provided, the input of which is connected to the battery module interface 10, and the output of which is connected to the main controller 31. The voltage detection circuit 32 is used to detect the battery voltage of the battery module when the battery module is connected to the battery module interface 10, and output the corresponding battery voltage detection signal to the main controller 31.

[0080] The main controller 31 is also used to perform OCV calibration on the connected battery module based on the battery voltage detection signal.

[0081] In this embodiment, the main controller 31 can be a microprocessor such as a single-chip microcomputer, FPGA, or CPLD to implement the overall control of the battery module discharge calibration device. The voltage detection circuit 32 can use a voltage sensor or a resistor divider to detect the voltage. The voltage detection circuit 32 can detect the battery voltage of the connected battery module, that is, the voltage across the battery module. When all the switches in the load component 20 are in the off state, that is, when no electrical load is connected, the voltage detected by the voltage detection circuit 32 is the open-circuit voltage of the battery module. At this time, the main controller 31 can determine the open-circuit voltage of the battery module based on the voltage detection signal output by the voltage detection circuit 32, and then perform OCV calibration on the connected battery module, thereby improving the calibration accuracy and practicality of the battery module discharge calibration device. Furthermore, the main controller 31 can also estimate the SOC value of the battery module at this time based on the OCV calibration result, and control the corresponding switch in the load component 20 to turn on based on the estimated SOC value, so that after the battery module starts discharging at the maximum current, the current is adjusted to a suitable current for the battery module to start discharging, that is, adaptively adjusting the output current, so that the battery module can discharge safely and stably, improving the stability and safety of the battery module discharge calibration device.

[0082] Referring to Figures 1 to 3, in one embodiment, the battery module discharge calibration device further includes:

[0083] A microcircuit 40 is connected in series between the battery module interface 10 and the voltage detection circuit 32. The microcircuit 40 is used to control the electrical connection between the battery module interface 10 and the voltage detection circuit 32 when the circuit is turned on.

[0084] The shunt trip unit 50 is electrically connected to the main controller 31, and the shunt trip unit 50 is linked to the micro circuit breaker 40.

[0085] The main controller 31 is also used to control the shunt trip unit 50 to turn on when the cell voltage in the battery module is lower than the termination voltage value according to the cell parameters, so as to control the microcircuit breaker 40 to turn off.

[0086] In this embodiment, a microcircuit breaker 40 is also provided between the battery module interface 10 and the voltage detection circuit 32 to control the connection or disconnection of the path between the battery module interface 10 and the voltage detection circuit 32. It can be understood that one end of the microcircuit breaker 40 can be connected to the battery module interface 10, and the other end can be connected to other components in the calibration device that need to be connected to the battery module interface 10. That is, the microcircuit breaker 40 can be placed between the battery module interface 10 and other components or circuits, so that the microcircuit breaker 40 can control the connection / disconnection of the connected battery module with other components or circuits, acting as a main switch. In this embodiment, a shunt trip unit 50 is also provided in conjunction with the microcircuit breaker 40. The shunt trip unit 50 is an accessory for remotely controlling the tripping of the circuit breaker. When the main controller 31 controls the shunt trip unit 50 to be turned on, the shunt trip unit 50 can drive the microcircuit breaker 40 to be turned off, causing the battery module to disconnect from other components or circuits. It is understandable that the battery module contains multiple cells, and the main controller 31 can obtain the voltage values ​​of multiple cells. Thus, when the main controller 31 determines that the lowest cell voltage value among the multiple cell voltage values ​​is lower than the termination voltage value, that is, when it determines that the battery module is fully discharged or the battery module is undervoltage, it controls the shunt trip unit 50 to conduct, thereby controlling the microcircuit breaker 40 to turn off, so that the battery module stops discharging, playing the role of undervoltage protection. This can effectively prevent the battery module from being damaged due to undervoltage, and improve the safety and stability of discharge calibration.

[0087] Referring to Figures 1 to 3, in one embodiment, the electronic control component 30 further includes:

[0088] An undervoltage protection circuit 33 is provided. The input terminal of the undervoltage protection circuit 33 is connected to the output terminal of the voltage detection circuit 32, and the output terminal of the undervoltage protection circuit 33 is connected to the main controller 31. The undervoltage protection circuit is used to output an undervoltage protection signal to the main controller 31 when it is determined that the battery module is undervoltage based on the battery voltage detection signal, so that the main controller 31 controls the shunt trip unit 50 to conduct, thereby controlling the microcircuit breaker 40 to turn off.

[0089] In one embodiment, the electronic control component 30 also includes an undervoltage protection circuit 33. This undervoltage protection circuit 33 can be implemented using a comparator. The first input terminal of the comparator is connected to a threshold voltage, which can be set according to actual calibration requirements. The second input terminal of the comparator is connected to the output terminal of the voltage detection circuit 32. Thus, when the battery voltage detected by the voltage detection circuit 32 is less than the threshold voltage, the comparator outputs a high level, i.e., outputs an undervoltage protection signal to the main controller 31, causing the main controller 31 to control the microcircuit breaker 40 to shut off, thereby achieving undervoltage protection. Alternatively, the undervoltage protection circuit 33 can be integrated with the voltage detection circuit and directly connected to the battery module interface, allowing the undervoltage protection circuit 33 to complete the voltage detection and undervoltage judgment process. In this way, by setting up the undervoltage protection circuit 33, the hardware circuit determines whether the battery module is undervoltage, enabling undervoltage protection even when software control fails, achieving a dual protection effect. Furthermore, it is understood that a battery module contains multiple cells, and the battery voltage detected by the voltage detection circuit 32 is the total voltage of these cells. This means that the undervoltage protection circuit 33's trigger condition for undervoltage protection is equivalent to the average cell voltage value, which differs from the main controller 31's condition for controlling undervoltage protection based on the lowest cell voltage. Therefore, the average cell voltage value calculated using the threshold voltage should be slightly higher than the lowest cell voltage value determined by the main controller 31 to improve the stability of undervoltage protection. This allows the battery module discharge calibration equipment to effectively prevent damage to the battery module due to undervoltage, thus improving the safety and stability of the discharge calibration.

[0090] Referring to Figures 1 to 3, in one embodiment, the battery module discharge calibration device further includes:

[0091] A voltage conversion circuit 90 is provided, the input terminal of which is connected to the battery module interface 10, and the output terminal of which is connected to the electronic control component 30. The voltage conversion circuit 90 is used to convert the voltage output by the battery module into a power supply voltage and output it to the electronic control component 30 when the battery module is connected to the battery module interface 10, so as to supply power to the electronic control component 30.

[0092] In this embodiment, the voltage conversion circuit 90 can be implemented using a DC-DC voltage conversion circuit 90. This circuit converts the voltage output from the battery module into a supply voltage to power the electronic control component 30. Thus, the connected battery module supplies power to the electronic control component 30, eliminating the need for an additional power supply and accelerating the battery module's discharge speed, thereby saving energy. Furthermore, the voltage conversion circuit 90 can also supply power to other functional components or circuits in the battery module discharge calibration device, thereby improving the battery module's energy utilization rate and achieving energy conservation and environmental protection.

[0093] Referring to Figures 1 to 3, in one embodiment, the battery module discharge calibration device further includes:

[0094] Cooling fan 70, the controlled end of the cooling fan is connected to the electronic control component 30;

[0095] A temperature detection module is connected to the electronic control component 30. The temperature detection module is used to detect the temperature of the load component 20 and the air outlet of the cooling fan 70, and output a corresponding temperature detection signal so that the electronic control component 30 controls the cooling fan 70 to work and / or controls the corresponding switch in the load component 20 to turn on, so as to adjust the output current of the battery module.

[0096] Optionally, the temperature detection module includes:

[0097] A first temperature sensor 60 is connected to the electronic control component 30. The first temperature sensor 60 is used to detect the temperature of the load component 20 and output a corresponding first temperature detection signal so that the electronic control component 30 controls the cooling fan 70 to work according to the first temperature detection signal to dissipate heat from the load component 20.

[0098] The second temperature sensor 80 is disposed at the air outlet of the cooling fan 70. The second temperature sensor 80 is connected to the electronic control component 30. The second temperature sensor 80 is used to detect the temperature at the air outlet of the cooling fan 70 and output a corresponding second temperature detection signal, so that the electronic control component 30 controls the corresponding switch in the load component 20 to conduct according to the first temperature detection signal and the second temperature detection signal, so as to adjust the output current of the battery module.

[0099] It is understandable that, since the battery module discharge calibration device has a load component 20 to consume the electrical energy of the battery module, and the load component 20 consists of multiple electrical loads, the load component 20 will generate a large amount of heat when discharging the battery module. In one embodiment, the battery module discharge calibration device also includes a first temperature sensor 60 and a cooling fan 70. The first temperature sensor 60 is used to detect the temperature of the load component 20. When the electronic control component 30 determines that the temperature of the load component 20 is higher than a preset temperature threshold based on the first temperature detection signal, it controls the cooling fan 70 to dissipate heat from the load component 20. Furthermore, multiple temperature sensors can be installed in the battery module discharge calibration device to provide multi-point control of the components within the device, enabling timely heat dissipation of the components and preventing damage to the battery module discharge calibration device and the battery module due to excessive temperature, thereby improving the safety of the battery module discharge calibration device.

[0100] A second temperature sensor 80 is also provided at the air outlet of the cooling fan 70 to detect the temperature at the air outlet. The electronic control component 30 can also adjust the output current of the battery module based on the temperatures detected by the first temperature sensor 60 and the second temperature sensor 80, thereby controlling the temperature inside the battery module discharge calibration device and preventing users from being burned due to excessively high temperatures at the air outlet. Furthermore, multiple temperature sensors can be installed inside the battery module discharge calibration device to provide multi-point control of the components within the device, promptly dissipating heat from the components and adjusting the output current of the battery module. This maintains the temperature inside the device within a safe range, preventing damage to the battery module discharge calibration device and the battery module due to excessive temperature, and preventing users from being burned by excessively high air outlet temperatures, thus improving the safety of the battery module discharge calibration device.

[0101] Referring to Figures 1 to 3, in one embodiment, the battery module discharge calibration device further includes:

[0102] A main switch circuit 100 is disposed between the load component 20 and the battery module interface 10. The controlled terminal of the main switch circuit 100 is connected to the electronic control component 30. The main switch circuit 100 is used to control the load component 20 to be electrically connected to the battery module interface 10 when it is turned on.

[0103] In one embodiment, a main switch circuit 100 is further provided between the load component 20 and the battery module interface 10. The main switch circuit 100 can be composed of switching devices such as circuit breakers and relays to control the connection / disconnection between the load component 20 and the battery module interface 10. Thus, when the load component 20 malfunctions, causing the electronic control component 30 to lose control of the load component 20, the electronic control component 30 can control the main switch circuit 100 to disconnect the electrical connection between the load component 20 and the battery module interface 10, thereby stopping the battery module from discharging, preventing damage to the battery module and the load component 20, and improving the safety of the battery module discharge calibration device.

[0104] Based on the above-described battery module discharge calibration device, the present invention also proposes a battery module discharge calibration method. Referring to FIG6, in one embodiment, it includes:

[0105] Step S100: Obtain the cell parameters in the battery module, and control the load component 20 to consume the electrical energy output by the battery module according to the cell parameters;

[0106] Step S200: When the voltage of the battery module reaches a preset voltage threshold according to the cell parameters, adjust the output current of the battery module according to the cell parameters, and perform SOC calibration on the connected battery module.

[0107] Step S300: When the cell voltage of the battery module is determined to be less than or equal to the termination voltage value according to the cell parameters, the load component 20 is controlled to stop consuming the electrical energy output by the battery module, and the SOC value of the battery module is calibrated to the starting value.

[0108] In this embodiment, after the battery module is connected to the battery module interface 10, the electronic control component 30 can establish a communication connection with the battery management unit (BMU) in the battery module and obtain the cell parameters of the battery module from the BMU, such as the SOC value, cell voltage, and cell discharge rate. Based on the obtained cell parameters, the electronic control component 30 can control the switching transistor in the load component 20 to conduct, so that the electrical load is electrically connected to the battery module, causing the battery module to begin discharging.

[0109] When the battery module voltage reaches a preset voltage threshold based on the cell parameters, the preset voltage threshold is the State of Charge (SOC) value at the end of the discharge process, i.e., when the battery module discharges to 10% or below the SOC value, the electronic control component 30 can also control the corresponding switch in the load component 20 to turn on / off, changing the number of electrical loads connected to the battery module. This allows adjustment of the battery module's output current, i.e., changing the battery module's discharge rate. Simultaneously, while adjusting the output current of the load component 20, the SOC of the battery module is calibrated. Specifically, the electronic control component 30 can control the corresponding switch in the load component 20 to turn on / off, gradually reducing the number of connected electrical loads, thereby gradually decreasing the battery module's output current and slowing down the rate of voltage drop in the cell. This protects the cell while achieving higher accuracy in SOC calibration. The frequency at which the electronic control component 30 adjusts the current can be set according to the calibration frequency; for example, the current can be reduced each time the SOC value is calibrated until calibration is complete. Furthermore, the frequency of current adjustment and calibration of the electronic control component 30 can also be set according to the cell voltage of the battery module. For example, the SOC value is calibrated once every time the cell voltage of the battery module drops by a certain value, and the current is reduced once until the calibration is completed.

[0110] When the cell voltage of the battery module drops to the termination voltage value, the switch in the load component 20 is turned off, causing the battery module to stop discharging. The termination voltage value can be set to the voltage value when the battery module is fully discharged, or it can be set according to actual calibration requirements. Thus, when the cell voltage of the battery module drops to the termination voltage value, it can be considered that the battery module is fully discharged. At this time, the electronic control module calibrates the SOC value of the battery module to the starting value, that is, the SOC value corresponding to the full discharge of the battery module, completing the SOC calibration of the battery module, and controlling the load component 20 to stop consuming the electrical energy output by the battery module.

[0111] In this invention, the load component 20 discharges the connected battery module, bringing the battery module's energy to the discharge end. At the discharge end, the output current of the battery module is adjusted based on the acquired cell parameters, and SOC calibration is performed on the connected battery module, thus realizing the SOC calibration function. This invention adjusts the battery module's output current based on cell parameters while performing SOC calibration, protecting the cells while improving the accuracy of SOC calibration, effectively enhancing the accuracy of SOC calibration, and extending the service life of the calibrated battery module.

[0112] Referring to Figure 7, in one embodiment, the step of obtaining the cell parameters in the battery module and controlling the load component 20 to consume the electrical energy output by the battery module according to the cell parameters includes:

[0113] Step S110: Obtain the cell parameters in the battery module, determine the maximum output current of the battery module based on the cell parameters, and control the corresponding switch in the load assembly 20 to turn on based on the determined maximum output current, so as to connect the corresponding number of electrical loads to the battery module.

[0114] The electronic control component 30 can communicate with the connected battery module through the battery module interface 10 and obtain the battery module's cell parameters, such as the maximum charge / discharge rate of the cell, i.e., the maximum charge output current of the cell. Therefore, the electronic control component 30 can also determine the maximum output current of the battery module through the obtained cell parameters and control the corresponding switching transistors in the load component 20 to conduct. By controlling the number of connected electrical loads, the battery module can discharge at its maximum output current. For example, as shown in Figure 4, which is a circuit structure diagram of an embodiment of the load component 20, the load component 20 includes six load resistors and six switching transistors. When the output voltage of the battery module is constant, changing the total resistance value of the load component 20 can change the output current of the battery module. Therefore, the electronic control component 30 can change the total resistance of the load component 20 by controlling the conduction of different numbers of switching transistors, thereby changing the output current of the battery module. For example, when the resistance of each load resistor is 12Ω, the output voltage of the battery module is 24V, and its maximum output current is 6A, the total resistance of the corresponding load component 20 is 4Ω. This means that when the electronic control component 30 controls three of the switching transistors to conduct, the output current of the battery module can reach its maximum. This configuration, using the battery module's maximum current for discharge, accelerates the discharge speed, allowing the battery module to quickly discharge to the end of its discharge cycle. This enables rapid SOC calibration and improves the calibration efficiency of the battery module discharge calibration device.

[0115] Step S120: Determine the cell voltage of the battery module according to the cell parameters, and adjust the output current of the battery module according to the cell voltage.

[0116] The electronic control component 30 can also determine the cell voltage of the battery module based on the cell parameters, and control the corresponding switch in the load component 20 to conduct based on the cell voltage of the battery module. After the battery module starts discharging at the maximum current, the current is adjusted to a suitable current for the battery module to start discharging. That is, the output current is adaptively adjusted, so that the battery module can discharge safely and stably, improving the stability and safety of the battery module discharge calibration device.

[0117] Referring to Figure 8, in one embodiment, when the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the steps of adjusting the output current of the battery module according to the cell parameters and performing SOC calibration on the connected battery module are as follows:

[0118] When the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the cell voltage of the battery module is determined based on the cell parameters. The corresponding switch in the load assembly 20 is then controlled to disconnect the electrical load from the battery module one by one based on the cell voltage, so as to gradually reduce the output current of the battery module and perform SOC calibration on the connected battery module.

[0119] It is understandable that during the discharge process of the battery module, the cell voltage in the battery module will gradually decrease as the discharge progresses. Therefore, the cell voltage of the battery module can be determined based on the cell parameters, and the corresponding switch in the load assembly 20 can be turned on / off according to the cell voltage to gradually reduce the number of connected electrical loads, thereby gradually reducing the output current of the battery module and slowing down the rate of cell voltage drop. This protects the cells while improving the accuracy of SOC calibration. Referring to Figure 4, which is a circuit structure diagram of an embodiment of the load assembly 20, the load assembly 20 includes six load resistors and six switches. When the output voltage of the battery module is constant, changing the total resistance value of the load assembly 20 can change the output current of the battery module. Therefore, the electronic control assembly 30 can change the total resistance of the load assembly 20 by controlling the conduction of different numbers of switches, thereby changing the output current of the battery module and realizing the function of regulating the output current of the battery module. For example, when five switching transistors are on, the electronic control component 30 controls any one of them to turn off, thereby increasing the total resistance of the load component 20 and reducing the output current of the battery module. Therefore, the electronic control component 30 can turn off multiple on switching transistors in the load component 20 one by one according to the cell voltage to gradually reduce the output current of the battery module. The frequency at which the electronic control component 30 adjusts the current can be set according to the calibration frequency; for example, the current is reduced once each time the SOC value is calibrated until calibration is complete. Furthermore, the frequency of current adjustment and calibration of the electronic control component 30 can also be set according to the cell voltage of the battery module; for example, the SOC value is calibrated and the current is reduced once each time the cell voltage of the battery module decreases by a certain value until calibration is complete.

[0120] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A battery module discharge calibration device, characterized in that, include: Battery module interface, used to connect to the battery module; A load component is electrically connected to the battery module interface. The load component is used to consume the electrical energy output by the battery module when the battery module is connected to the battery module interface. The load component includes multiple electrical loads and multiple switching transistors. An electronic control component, wherein the communication terminal of the electronic control component is connected to the interface of the battery module, and the control terminal of the electronic control component is connected to the load component, the electronic control component is used to obtain the cell parameters in the battery module when the battery module is connected to the interface of the battery module, and control the load component to consume the electrical energy output by the battery module according to the cell parameters; The electronic control component is further configured to, when the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, adjust the output current of the battery module by gradually decreasing the output current of the battery module according to the cell parameters, and perform SOC calibration on the connected battery module; wherein, the preset voltage threshold is used to indicate the SOC value of the battery module when it reaches the end of discharge; the electronic control component includes: a main controller, the communication terminal of the main controller is connected to the battery module interface, the control terminal of the main controller is connected to the load component, and the main controller is configured to, when the battery module is connected to the battery module interface, acquire the cell parameters in the battery module, and control the load component to consume the output current of the battery module according to the cell parameters. The system provides electrical energy output; a voltage detection circuit, the input of which is connected to the battery module interface, and the output of which is connected to the main controller. The voltage detection circuit is used to detect the battery voltage of the battery module when it is connected to the battery module interface, and output a corresponding battery voltage detection signal to the main controller. The main controller is also used to perform OCV calibration on the connected battery module based on the battery voltage detection signal; it is also used to estimate the SOC value of the battery module based on the OCV calibration result, and control the corresponding switch in the load component to turn on based on the estimated SOC value, so that after the battery module starts discharging at the maximum current, the current is adjusted to a suitable current for the battery module to start discharging.

2. The battery module discharge calibration device as described in claim 1, characterized in that, Multiple electrical loads are connected in parallel, each switching transistor is connected in series with one electrical load, and the controlled terminal of each switching transistor is connected to the electronic control component; the electronic control component is also used to determine the maximum output current of the battery module according to the cell parameters, and control the corresponding switching transistor in the load component to conduct according to the determined maximum output current, so as to connect the corresponding number of electrical loads to the battery module.

3. The battery module discharge calibration device as described in claim 2, characterized in that, The electronic control component is also used to control the corresponding switch in the load component to disconnect the electrical load from the battery module one by one when the battery module's cell voltage reaches a preset voltage threshold based on the cell parameters, so as to gradually reduce the output current of the battery module and perform SOC calibration on the connected battery module.

4. The battery module discharge calibration device as described in claim 3, characterized in that, The electronic control component is also used to control the load component to stop consuming the electrical energy output by the battery module and to calibrate the SOC value of the battery module to the initial value when the cell voltage of the battery module is determined to be less than or equal to the termination voltage value based on the cell parameters.

5. The battery module discharge calibration device as described in claim 1, characterized in that, The battery module discharge calibration device further includes: a microcircuit breaker, which is connected in series between the battery module interface and the load component, and is used to control the electrical connection between the battery module interface and the load component when it is turned on; a shunt trip unit, which is electrically connected to the electronic control component, and is linked to the microcircuit breaker; the electronic control component is also used to control the shunt trip unit to turn on when the cell voltage in the battery module is lower than the termination voltage value according to the cell parameters, so as to control the microcircuit breaker to turn off.

6. The battery module discharge calibration device as described in claim 5, characterized in that, The battery module discharge calibration device further includes an undervoltage protection circuit. The input terminal of the undervoltage protection circuit is connected to the battery module interface, and the output terminal of the undervoltage protection circuit is connected to the main controller. The undervoltage protection circuit is used to detect the battery voltage of the battery module when the battery module is connected to the battery module interface, and outputs an undervoltage protection signal to the main controller when it is determined that the battery module is undervoltage, so that the main controller controls the shunt trip unit to conduct, thereby controlling the microcircuit breaker to turn off.

7. The battery module discharge calibration device as described in claim 1, characterized in that, The battery module discharge calibration device further includes a voltage conversion circuit, the input terminal of which is connected to the battery module interface, and the output terminal of which is connected to the electronic control component. The voltage conversion circuit is used to convert the voltage output by the battery module into a power supply voltage and output it to the electronic control component when the battery module is connected to the battery module interface, so as to power the electronic control component.

8. The battery module discharge calibration device as described in claim 1, characterized in that, The battery module discharge calibration device further includes: a cooling fan, the controlled end of which is connected to the electronic control component; and a temperature detection module, which is connected to the electronic control component. The temperature detection module is used to detect the temperature of the load component and the air outlet of the cooling fan, and outputs a corresponding temperature detection signal so that the electronic control component controls the cooling fan to work and / or controls the corresponding switching transistor in the load component to conduct according to the temperature detection signal, thereby adjusting the output current of the battery module.

9. The battery module discharge calibration device as described in claim 8, characterized in that, The temperature detection module includes: a first temperature sensor connected to the electronic control component, the first temperature sensor being used to detect the temperature of the load component and output a corresponding first temperature detection signal, so that the electronic control component controls the cooling fan to work according to the first temperature detection signal to dissipate heat from the load component; and a second temperature sensor disposed at the air outlet of the cooling fan, the second temperature sensor being connected to the electronic control component, the second temperature sensor being used to detect the temperature at the air outlet of the cooling fan and output a corresponding second temperature detection signal, so that the electronic control component controls the corresponding switching transistor in the load component to conduct according to the first temperature detection signal and the second temperature detection signal, thereby adjusting the output current of the battery module.

10. The battery module discharge calibration device as described in claim 1, characterized in that, The battery module discharge calibration device further includes a main switch circuit, which is connected in series between the load component and the battery module interface. The controlled terminal of the main switch circuit is connected to the electronic control component. The main switch circuit is used to control the load component to be electrically connected to the battery module interface when it is turned on.

11. A battery module discharge calibration method, based on the battery module discharge calibration device as described in any one of claims 1-10, characterized in that, include: Obtain the cell parameters in the battery module, and control the load components to consume the electrical energy output by the battery module based on the cell parameters; When the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the output current of the battery module is adjusted according to the cell parameters, and the SOC calibration of the connected battery module is performed. When the cell voltage of the battery module is determined to be less than or equal to the termination voltage value based on the cell parameters, the load component is controlled to stop consuming the electrical energy output by the battery module, and the SOC value of the battery module is calibrated to the initial value.

12. The battery module discharge calibration method as described in claim 11, characterized in that, The step of obtaining the cell parameters in the battery module and controlling the load assembly to consume the electrical energy output by the battery module according to the cell parameters includes: obtaining the cell parameters in the battery module; determining the maximum output current of the battery module according to the cell parameters; controlling the corresponding switch in the load assembly to turn on according to the determined maximum output current to connect the corresponding number of electrical loads to the battery module; determining the cell voltage of the battery module according to the cell parameters; and adjusting the output current of the battery module according to the cell voltage of the battery module.

13. The battery module discharge calibration method as described in claim 11, characterized in that, The specific steps for adjusting the output current of the battery module and performing SOC calibration on the connected battery module when the voltage of the battery module reaches a preset voltage threshold based on the cell parameters are as follows: When the voltage of the battery module reaches a preset voltage threshold based on the cell parameters, the corresponding switch in the load component is controlled to disconnect the electrical load from the battery module one by one according to the cell voltage, so as to gradually reduce the output current of the battery module and perform SOC calibration on the connected battery module.

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