Lithium battery and super capacitor combined BMS (Battery Management System) integrated control system

Abstract

The utility model relates to the technical field of BMS control, in particular to a lithium battery and super capacitor combined BMS integrated control system, which comprises a lithium battery pack, a DC / DC module, a super capacitor bank, a pre-charging module, a charging module, a BMS management module and a master control module, the DC / DC module is a bidirectional DC / DC converter, the pre-charging module is used for enabling the super capacitor bank to work under rated voltage, and the charging module is used for enabling the super capacitor bank to work under rated voltage. The charging module is used for controlling whether the lithium battery pack is directly connected with the power bus, the main control module is used for controlling the BMS management module, and two ends of the super capacitor bank are connected with the power bus. According to the utility model, the lithium battery pack and the super capacitor bank are controlled in a semi-active manner, the structure is simple, the charging and discharging of the lithium battery pack and the super capacitor bank can be flexibly controlled, and the terminal voltage of the super capacitor bank can be charged to the adjustable range of the DC / DC module through the pre-charging module. The charging module can control whether the lithium battery pack and the power bus are directly connected or not, so that the whole system works stably, and the practicability is higher.

Description

Technical Field

[0001] This utility model relates to the field of BMS control technology, specifically to an integrated BMS control system combining a lithium battery and a supercapacitor. Background Technology

[0002] The combined application of lithium batteries and supercapacitors can optimize energy management and improve system performance. Supercapacitors, with their high power density and rapid charge / discharge capabilities, can effectively handle instantaneous high-power demands, such as energy supply during the acceleration phase of electric vehicles, thereby reducing the workload on lithium batteries and avoiding the impact of deep discharge or high-frequency, high-current surges on battery life. Simultaneously, the presence of supercapacitors helps maintain voltage stability throughout the energy storage system, especially under dynamic load conditions, balancing voltage differences between individual battery cells and improving system safety and stability. Furthermore, through complementary effects, the two energy storage devices can work synergistically to optimize overall energy conversion efficiency, enhance cycle life, and achieve higher overall energy density in specific applications.

[0003] Integrating lithium batteries with supercapacitors can create an energy storage solution that is efficient, durable, and flexible, and is widely applicable to power electronic equipment, electric vehicles, and various fields that require high-performance energy storage technology. This requires a BMS integrated control system that combines lithium batteries and supercapacitors. Utility Model Content

[0004] The purpose of this invention is to provide a BMS integrated control system combining lithium battery and supercapacitor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An integrated BMS control system combining a lithium battery and a supercapacitor includes a lithium battery pack, a DC / DC module, a supercapacitor pack, a pre-charge module, a charging module, a BMS management module, and a main control module. The DC / DC module is a bidirectional DC / DC converter. The pre-charge module is used to enable the supercapacitor pack to operate at its rated voltage. The charging module is used to control whether the lithium battery pack is directly connected to the power bus. The BMS management module is used to control the lithium battery pack, the DC / DC module, the supercapacitor pack, the pre-charge module, and the charging module. The main control module is used to control the BMS management module. Both ends of the supercapacitor pack are connected to the power bus.

[0007] Preferably, the DC / DC module includes a first capacitor C1, a first inductor L1, a second inductor L2, a second capacitor C2, a first transistor Q1, a first diode D1, a second transistor Q2, a second diode D2, a third transistor Q3, a third diode D3, a fourth transistor Q4, and a fourth diode D4.

[0008] The first terminal of the first capacitor C1 is connected to the first terminal of the supercapacitor group, and the second terminal of the first capacitor C1 is connected to the second terminal of the supercapacitor group. The first terminal of the first inductor L1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first inductor L1 is connected to the emitter of the first transistor Q1. The first terminal of the second inductor L2 is connected to the first terminal of the first capacitor C1, and the second terminal of the second inductor L2 is connected to the emitter of the third transistor Q3. The collector of the first transistor Q1 is connected to the first terminal of the second capacitor C2, the collector of the third transistor Q3 is connected to the first terminal of the second capacitor C2, the collector of the second transistor Q2 is connected to the second terminal of the first inductor L1, and the emitter of the second transistor Q2 is connected to the second terminal of the first capacitor C1. The collector of the fourth transistor Q4 is connected to the second terminal of the second inductor L2, and the emitter of the fourth transistor Q4 is connected to the second terminal of the first capacitor C1. The first terminal of the second capacitor C2 is connected to the positive terminal of the lithium battery group, and the second terminal of the second capacitor C2 is connected to the negative terminal of the lithium battery group. The second terminal of the second capacitor C2 is also connected to the second terminal of the first capacitor C1.

[0009] The bases of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are all controlled by the BMS management module;

[0010] The anode of the first diode D1 is connected to the emitter of the first transistor Q1, and the cathode of the first diode D1 is connected to the collector of the first transistor Q1. The anode of the second diode D2 is connected to the emitter of the second transistor Q2, and the cathode of the second diode D2 is connected to the collector of the second transistor Q2. The anode of the third diode D3 is connected to the emitter of the third transistor Q3, and the cathode of the third diode D3 is connected to the collector of the third transistor Q3. The anode of the fourth diode D4 is connected to the emitter of the fourth transistor Q4, and the cathode of the fourth diode D4 is connected to the collector of the fourth transistor Q4.

[0011] Preferably, the pre-charge module includes a resistor R, a fifth transistor Q5, and a fifth diode D5;

[0012] The emitter of the fifth transistor Q5 is connected to the first terminal of the supercapacitor group, the collector of the fifth transistor Q5 is connected to the first terminal of the resistor R, the second terminal of the resistor R is connected to the positive terminal of the lithium battery group, the base of the fifth transistor Q5 is controlled by the BMS management module, the positive terminal of the fifth diode D5 is connected to the emitter of the fifth transistor Q5, and the negative terminal of the fifth diode D5 is connected to the collector of the fifth transistor Q5.

[0013] Preferably, the power replenishment module includes a sixth transistor Q6, a sixth diode D6, and a seventh diode D7;

[0014] The emitter of the sixth transistor Q6 is connected to the first terminal of the supercapacitor group, the collector of the sixth transistor Q6 is connected to the negative terminal of the seventh diode D7, the base of the sixth transistor Q6 is controlled by the BMS management module, the anode of the seventh diode D7 is connected to the positive terminal of the lithium battery group, the anode of the sixth diode D6 is connected to the emitter of the sixth transistor Q6, and the cathode of the sixth diode D6 is connected to the collector of the sixth transistor Q6.

[0015] Preferably, the system also includes a first data acquisition module, which is used to collect parameters of the lithium battery pack during operation.

[0016] Preferably, the system also includes a second data acquisition module, which is used to collect parameters of the supercapacitor bank during operation.

[0017] Preferably, the system also includes a temperature measurement module and a temperature control module, wherein the temperature measurement module is used to measure the operating temperature and the temperature control module is used to control the operating temperature.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] In this invention, the lithium battery pack and supercapacitor pack are controlled in a semi-active manner. The structure is simple and can flexibly control the charging and discharging of the lithium battery pack and supercapacitor pack. At the same time, the pre-charging module can charge the terminal voltage of the supercapacitor pack to the adjustable range of the DC / DC module. The charging module can control whether the lithium battery pack and the power bus are directly connected, so that the whole system can work stably and has greater practicality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a partial circuit diagram of the utility model.

[0022] In the picture:

[0023] 1. Lithium battery pack;

[0024] 2. DC / DC module;

[0025] 3. Supercapacitor bank;

[0026] 4. Pre-charge module;

[0027] 5. Power replenishment module;

[0028] 6. First data acquisition module;

[0029] 7. Second data acquisition module;

[0030] 8. BMS Management Module;

[0031] 9. Main control module;

[0032] 10. Temperature measurement module;

[0033] 11. Temperature control module. Implementation

[0034] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Please see Figure 1 and Figure 2 The present invention provides the following technical solution:

[0036] An integrated BMS control system combining a lithium battery and a supercapacitor includes a lithium battery pack 1, a DC / DC module 2, a supercapacitor pack 3, a pre-charge module 4, a charging module 5, a BMS management module 8, and a main control module 9. The DC / DC module 2 is a bidirectional DC / DC converter. The pre-charge module 4 is used to ensure that the supercapacitor pack 3 operates at its rated voltage. The charging module 5 is used to control whether the lithium battery pack 1 is directly connected to the power bus. The BMS management module 8 is used to control the lithium battery pack 1, the DC / DC module 2, the supercapacitor pack 3, the pre-charge module 4, and the charging module 5. The main control module 9 is used to control the BMS management module 8. Both ends of the supercapacitor pack 3 are connected to the power bus. The pre-charge module 4 and the charging module 5 make the system more stable, easier to control, and more practical.

[0037] In this embodiment, the DC / DC module 2 includes a first capacitor C1, a first inductor L1, a second inductor L2, a second capacitor C2, a first transistor Q1, a first diode D1, a second transistor Q2, a second diode D2, a third transistor Q3, a third diode D3, a fourth transistor Q4, and a fourth diode D4, which can control the conduction and cutoff of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4;

[0038] The first terminal of capacitor C1 is connected to the first terminal of supercapacitor group 3, and the second terminal of capacitor C1 is connected to the second terminal of supercapacitor group 3. The first terminal of inductor L1 is connected to the first terminal of capacitor C1, and the second terminal of inductor L1 is connected to the emitter of transistor Q1. The first terminal of second inductor L2 is connected to the first terminal of capacitor C1, and the second terminal of second inductor L2 is connected to the emitter of transistor Q3. The collector of transistor Q1 is connected to the first terminal of capacitor C2, the collector of transistor Q3 is connected to the first terminal of capacitor C2, the collector of transistor Q2 is connected to the second terminal of inductor L1, and the emitter of transistor Q2 is connected to the second terminal of capacitor C1. The collector of fourth transistor Q4 is connected to the second terminal of second inductor L2, and the emitter of fourth transistor Q4 is connected to the second terminal of capacitor C1. The first terminal of second capacitor C2 is connected to the positive terminal of lithium battery group 1, the second terminal of second capacitor C2 is connected to the negative terminal of lithium battery group 1, and the second terminal of second capacitor C2 is also connected to the second terminal of first capacitor C1.

[0039] The bases of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are all controlled by the BMS management module 8;

[0040] The anode of the first diode D1 is connected to the emitter of the first transistor Q1, and the cathode of the first diode D1 is connected to the collector of the first transistor Q1. The anode of the second diode D2 is connected to the emitter of the second transistor Q2, and the cathode of the second diode D2 is connected to the collector of the second transistor Q2. The anode of the third diode D3 is connected to the emitter of the third transistor Q3, and the cathode of the third diode D3 is connected to the collector of the third transistor Q3. The anode of the fourth diode D4 is connected to the emitter of the fourth transistor Q4, and the cathode of the fourth diode D4 is connected to the collector of the fourth transistor Q4.

[0041] Specifically, the pre-charge module 4 includes a resistor R, a fifth transistor Q5, and a fifth diode D5. The pre-charge module 4 serves as the pre-charge circuit for the supercapacitor bank 3. When the terminal voltage of the supercapacitor bank 3 falls below the minimum controllable voltage of the DC / DC module 2 due to power loss, the fifth transistor Q5 is turned on, connecting the supercapacitor bank 3 to the positive terminal of the lithium battery pack 1, thus charging the supercapacitor bank 3 to the voltage range controllable by the DC / DC module 2. When the terminal voltage of the supercapacitor bank 3 is too low, its usable energy is also very limited. The pre-charge circuit ensures that the supercapacitor bank 3 operates at approximately its rated voltage when the system starts working.

[0042] The emitter of the fifth transistor Q5 is connected to the first terminal of the supercapacitor group 3, the collector of the fifth transistor Q5 is connected to the first terminal of the resistor R, the second terminal of the resistor R is connected to the positive terminal of the lithium battery group 1, the base of the fifth transistor Q5 is controlled by the BMS management module 8, the positive terminal of the fifth diode D5 is connected to the emitter of the fifth transistor Q5, and the negative terminal of the fifth diode D5 is connected to the collector of the fifth transistor Q5.

[0043] Furthermore, the power replenishment module 5 includes a sixth transistor Q6, a sixth diode D6, and a seventh diode D7, which can control whether the lithium battery pack 1 is directly connected to the power bus;

[0044] The emitter of the sixth transistor Q6 is connected to the first terminal of the supercapacitor group 3, the collector of the sixth transistor Q6 is connected to the negative terminal of the seventh diode D7, the base of the sixth transistor Q6 is controlled by the BMS management module 8, the positive terminal of the seventh diode D7 is connected to the positive terminal of the lithium battery group 1, the positive terminal of the sixth diode D6 is connected to the emitter of the sixth transistor Q6, and the negative terminal of the sixth diode D6 is connected to the collector of the sixth transistor Q6.

[0045] In addition, it also includes a first data acquisition module 6, which is used to collect parameters of the lithium battery pack 1 during operation, including operating temperature, operating voltage and operating current.

[0046] It is worth noting that it also includes a second data acquisition module 7, which is used to collect parameters of the supercapacitor bank 3 during operation, including operating temperature, operating voltage and operating current.

[0047] It is worth noting that the system also includes a temperature measurement module 10 and a temperature control module 11. The temperature measurement module 10 is used to measure the operating temperature, and the temperature control module 11 is used to control the operating temperature to ensure that the system operates at a suitable temperature.

[0048] When the lithium battery and supercapacitor combination BMS integrated control system of this utility model is in use, the main control module 9 controls the BMS management module 8, and the BMS management module 8 controls the lithium battery pack 1, DC / DC module 2, supercapacitor pack 3, pre-charging module 4 and charging module 5, based on the data collected by the first data acquisition module 6 and the second data acquisition module 7.

[0049] The pre-charge module 4 is a pre-charge circuit for the supercapacitor group 3. When the terminal voltage of the supercapacitor group 3 is lower than the minimum controllable voltage of the DC / DC module 2 due to power failure, the fifth transistor Q5 is turned on, connecting the supercapacitor group 3 to the positive terminal of the lithium battery group 1, and charging the supercapacitor group 3 to the voltage range controllable by the DC / DC module 2. When the terminal voltage of the supercapacitor group 3 is too low, its usable energy is also very low. The pre-charge circuit can ensure that the supercapacitor group 3 operates at around the rated voltage when the system starts working.

[0050] The charging module 5 can control whether the lithium battery pack 1 is directly connected to the power bus;

[0051] The BMS management module 8 controls the DC / DC module 2, the pre-charge module 4, and the charging module 5 by controlling the corresponding transistors. The main control module 9 can adjust the temperature control module 11 according to the temperature measured by the temperature measurement module 10, so that the whole system can work at a suitable temperature.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A lithium battery and supercapacitor combined BMS integrated control system, comprising a lithium battery pack (1), a DC / DC module (2), a supercapacitor pack (3), a pre-charging module (4), a charging module (5), a BMS management module (8), and a main control module (9), characterized in that: The DC / DC module (2) is a bidirectional DC / DC converter. The pre-charge module (4) is used to make the supercapacitor group (3) work at the rated voltage. The charging module (5) is used to control whether the lithium battery group (1) is directly connected to the power bus. The BMS management module (8) is used to control the lithium battery group (1), the DC / DC module (2), the supercapacitor group (3), the pre-charge module (4) and the charging module (5). The main control module (9) is used to control the BMS management module (8). Both ends of the supercapacitor group (3) are connected to the power bus.

2. The BMS integrated control system of lithium battery and supercapacitor combination according to claim 1, characterized in that: The DC / DC module (2) includes a first capacitor C1, a first inductor L1, a second inductor L2, a second capacitor C2, a first transistor Q1, a first diode D1, a second transistor Q2, a second diode D2, a third transistor Q3, a third diode D3, a fourth transistor Q4, and a fourth diode D4. The first capacitor C1 is connected to the first terminal of the supercapacitor group (3), the second terminal of the first capacitor C1 is connected to the second terminal of the supercapacitor group (3), the first inductor L1 is connected to the first terminal of the first capacitor C1, the second terminal of the first inductor L1 is connected to the emitter of the first transistor Q1, the first terminal of the second inductor L2 is connected to the first terminal of the first capacitor C1, the second terminal of the second inductor L2 is connected to the emitter of the third transistor Q3, the collector of the first transistor Q1 is connected to the first terminal of the second capacitor C2, the collector of the third transistor Q3 is connected to the first terminal of the second capacitor C2, the collector of the second transistor Q2 is connected to the second terminal of the first inductor L1, the emitter of the second transistor Q2 is connected to the second terminal of the first capacitor C1, the collector of the fourth transistor Q4 is connected to the second terminal of the second inductor L2, the emitter of the fourth transistor Q4 is connected to the second terminal of the first capacitor C1, the first terminal of the second capacitor C2 is connected to the positive terminal of the lithium battery group (1), the second terminal of the second capacitor C2 is connected to the negative terminal of the lithium battery group (1), and the second terminal of the second capacitor C2 is also connected to the second terminal of the first capacitor C1; The bases of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are all controlled by the BMS management module (8); The anode of the first diode D1 is connected to the emitter of the first transistor Q1, and the cathode of the first diode D1 is connected to the collector of the first transistor Q1. The anode of the second diode D2 is connected to the emitter of the second transistor Q2, and the cathode of the second diode D2 is connected to the collector of the second transistor Q2. The anode of the third diode D3 is connected to the emitter of the third transistor Q3, and the cathode of the third diode D3 is connected to the collector of the third transistor Q3. The anode of the fourth diode D4 is connected to the emitter of the fourth transistor Q4, and the cathode of the fourth diode D4 is connected to the collector of the fourth transistor Q4.

3. The BMS integrated control system of lithium battery and supercapacitor combination according to claim 1, characterized in that: The pre-charge module (4) includes a resistor R, a fifth transistor Q5, and a fifth diode D5; The emitter of the fifth transistor Q5 is connected to the first terminal of the supercapacitor group (3), the collector of the fifth transistor Q5 is connected to the first terminal of the resistor R, the second terminal of the resistor R is connected to the positive terminal of the lithium battery group (1), the base of the fifth transistor Q5 is controlled by the BMS management module (8), the positive terminal of the fifth diode D5 is connected to the emitter of the fifth transistor Q5, and the negative terminal of the fifth diode D5 is connected to the collector of the fifth transistor Q5.

4. The BMS integrated control system of lithium battery and supercapacitor combination according to claim 1, characterized in that: The power replenishment module (5) includes a sixth transistor Q6, a sixth diode D6 and a seventh diode D7; The emitter of the sixth transistor Q6 is connected to the first terminal of the supercapacitor group (3), the collector of the sixth transistor Q6 is connected to the negative terminal of the seventh diode D7, the base of the sixth transistor Q6 is controlled by the BMS management module (8), the positive terminal of the seventh diode D7 is connected to the positive terminal of the lithium battery group (1), the positive terminal of the sixth diode D6 is connected to the emitter of the sixth transistor Q6, and the negative terminal of the sixth diode D6 is connected to the collector of the sixth transistor Q6.

5. The BMS integrated control system of lithium battery and supercapacitor combination according to claim 1, characterized in that: It also includes a first data acquisition module (6), which is used to collect parameters of the lithium battery pack (1) during operation.

6. The BMS integrated control system of lithium battery and supercapacitor combination according to claim 1, characterized in that: It also includes a second data acquisition module (7), which is used to collect parameters of the supercapacitor group (3) during operation.

7. The BMS integrated control system of lithium battery and supercapacitor combination according to claim 1, characterized in that: It also includes a temperature measuring module (10) and a temperature control module (11), wherein the temperature measuring module (10) is used to measure the working temperature and the temperature control module (11) is used to control the working temperature.

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