A control device for the heating circuit of a backup power lithium battery pack for a pitch system

Abstract

This utility model relates to the field of lithium battery technology and discloses a control device for the heating circuit of a lithium battery block as a backup power source for a pitch system. It includes a battery casing with a built-in control board, a mounting plate mounted on the battery casing, a base installed inside the battery casing, and a lithium battery block housed inside the base. The battery casing also contains temperature control components for heating the lithium battery block. These temperature control components include a graphene carbon crystal printed heating film, a heating switch circuit, and a temperature acquisition circuit for monitoring the temperature of the lithium battery block. By using a lithium battery as a backup power source for the pitch system, the system's reliability is improved. The temperature control components are designed to control the temperature of the lithium battery block, ensuring its performance in low-temperature environments, and the temperature is monitored in real time to ensure the safety of the heating process. This reduces eddy currents and the phenomenon of performance degradation caused by localized overheating due to instantaneous peak current.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a control device for the heating circuit of a backup power lithium battery block in a pitch system. Background Technology

[0002] Lithium batteries, as backup power for wind power pitch systems, have advantages such as high energy density, long cycle life, low self-discharge rate, environmental friendliness, fast charging and discharging, high voltage platform, size and shape flexibility, fast response speed, wide temperature range, and low maintenance. These advantages make lithium batteries superior to traditional lead-acid batteries in terms of performance, environmental protection, economy, and flexibility, making them an ideal backup power solution for wind power pitch systems.

[0003] However, the performance of lithium batteries is affected by low temperatures, especially in northern my country, where the harsh operating conditions can reach as low as -50°C, severely impacting battery performance. Therefore, we need to propose a heating circuit control device for the backup power lithium battery pack in a pitch system to heat the battery and ensure its performance. Utility Model Content

[0004] The purpose of this invention is to provide a control device for the heating circuit of the backup power lithium battery block in a pitch system, which improves the performance of lithium batteries in low-temperature environments and expands the application scope of lithium batteries in the field of wind power generation, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a control device for the heating circuit of a backup power lithium battery block in a pitch system, comprising a battery housing with a built-in control board, a mounting plate mounted on the battery housing, a base installed inside the battery housing, a lithium battery block disposed inside the base, and a temperature control component for heating the lithium battery block disposed inside the battery housing.

[0006] The temperature control components include a graphene carbon crystal printed heating film, a heating switch circuit, and a temperature acquisition circuit for monitoring the temperature of the lithium battery block. The heating switch circuit, the temperature acquisition circuit, and the graphene carbon crystal printed heating film are all electrically connected to the control board. The control board integrates a temperature control circuit that compares the detected lithium battery block temperature with a preset temperature.

[0007] Preferably, the mounting plate is provided with a pin socket and a plug-in terminal, and a through hole one and a through hole two are provided on one side of the battery casing. The pin socket passes through the through hole one and is connected to the control board, and the plug-in terminal passes through the through hole two and is connected to the control board.

[0008] Preferably, the battery casing is further provided with a thermally conductive silicone sheet and an epoxy resin plate inside, the temperature control components are mounted on the thermally conductive silicone sheet, and the epoxy resin plate is located below the graphene carbon crystal printed heating film.

[0009] Preferably, the heating switch circuit includes a MOSFET Q8 and a transistor Q9. The gate of the MOSFET Q8 and the collector of the transistor Q9 are respectively connected to a resistor R15 and a series diode D5 and a diode D4. One end of the resistor R15 is connected to the source of the MOSFET Q8. The terminals of the diodes D5 and D4 are connected to a switch S1. One end of the switch S1 is connected to the emitter of the transistor Q9. The base of the transistor Q9 is connected to a resistor R16 and a resistor R14 connected in parallel.

[0010] Preferably, the temperature acquisition circuit includes a connector P5 and an amplifier U9. A resistor R17 and a capacitor C22 are connected in series to pin 1 of the connector P5. A resistor R21 is connected between pin 2 of the connector P5 and pin 3 of the amplifier U9. A resistor R25 is connected between pin 3 of the connector P5 and pin 2 of the amplifier U9. A resistor R26 and a capacitor C26 are connected in series to pin 4 of the connector P5 and pin 2 of the amplifier U9. A resistor R22 is connected between pin 1 and pin 8 of the amplifier U9.

[0011] Preferably, the temperature control circuit includes a voltage regulator U2, a MOSFET Q1, and a MOSFET Q2. A closed loop is formed between pin 3 of the voltage regulator U2 and the drain of the MOSFET Q1 by resistors R5, R11, and LED LD2. A closed loop is formed between pin 3 of the voltage regulator U2 and the drain of the MOSFET Q2 by resistors R6, R13, and LED LD3. Resistors R2 and R3, as well as resistors R4, capacitors C2 and C1 connected in parallel, are also connected to pin 3 of the voltage regulator U2.

[0012] Preferably, the gate of the MOS transistor Q1 is connected to resistors R7 and R9, the gate of the MOS transistor Q2 is connected to resistors R8 and R10, and the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2.

[0013] Preferably, capacitors C5 and C6 are connected in parallel between pin 1 and pin 3 of the voltage regulator U2, and capacitors C7 and C8 are connected in parallel between pin 2 and pin 4 of the voltage regulator U2.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model uses lithium batteries as backup power for the pitch system to improve system reliability. It designs temperature control components to control the temperature of the lithium battery pack, ensuring the performance of the lithium battery pack in low-temperature environments, and monitors the temperature of the lithium battery pack in real time to ensure the safety of the heating process.

[0016] 2. Because the voltage of the wind turbine is unstable, the temperature control components of this invention do not have redundant nodes, which reduces eddy currents and the phenomenon of local overheating caused by instantaneous peak current, thus reducing the performance degradation of lithium batteries. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the battery casing, pin holder, and plug-in terminals of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the battery casing of this utility model;

[0019] Figure 3 This is a schematic diagram showing the connection of the temperature control components, graphene carbon crystal printed heating film, and control board of this utility model.

[0020] Figure 4 This is a circuit diagram of the heating switch circuit of this utility model;

[0021] Figure 5 This is a circuit diagram of the temperature acquisition circuit of this utility model;

[0022] Figure 6 This is a circuit diagram of the temperature control circuit of this utility model.

[0023] In the diagram: 1. Battery casing; 11. Through hole one; 12. Through hole two; 2. Mounting plate; 21. Pin socket; 22. Plug-in terminal; 3. Base; 4. Lithium battery block; 5. Thermally conductive silicone sheet; 6. Temperature control components; 7. Graphene carbon crystal printed heating film; 8. Epoxy resin board; 9. Control board. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6This utility model provides a technical solution: a control device for the heating circuit of a backup power lithium battery block in a pitch system, including a battery housing 1 with a built-in control board 9, a mounting plate 2 installed on the battery housing 1, a base 3 installed inside the battery housing 1, a lithium battery block 4 disposed inside the base 3, and a temperature control component 6 for heating the lithium battery block 4 disposed inside the battery housing 1.

[0026] The temperature control component 6 includes a graphene carbon crystal printed heating film 7, a heating switch circuit, and a temperature acquisition circuit for monitoring the temperature of the lithium battery block 4. The heating switch circuit, the temperature acquisition circuit, and the graphene carbon crystal printed heating film 7 are all electrically connected to the control board 9. The control board 9 integrates a temperature control circuit that compares the detected temperature of the lithium battery block 4 with a preset temperature.

[0027] The mounting plate 2 is provided with a pin seat 21 and a plug-in terminal 22. A through hole 11 and a through hole 22 are provided on one side of the battery casing 1. The pin seat 21 passes through the through hole 11 and is connected to the control plate 9. The plug-in terminal 22 passes through the through hole 22 and is connected to the control plate 9.

[0028] The battery casing 1 is also provided with a thermally conductive silicone sheet 5 and an epoxy resin plate 8 inside. The temperature control component 6 is installed on the thermally conductive silicone sheet 5, and the epoxy resin plate 8 is located below the graphene carbon crystal printed heating film 7.

[0029] One end of the temperature control circuit is soldered to the control board 9, and the other end of the temperature control circuit is soldered to the graphene carbon crystal printed heating film 7.

[0030] In use, the temperature of the lithium battery block 4 is first detected by the temperature acquisition circuit. The temperature control circuit compares the acquired temperature of the lithium battery block 4 with the preset temperature to determine whether the lithium battery block 4 needs to be heated. If heating is required, the heating switch circuit is closed by the control board 9, so that the graphene carbon crystal printed heating film 7 heats the lithium battery block 4. During the heating process, the temperature of the lithium battery block 4 is monitored in real time to ensure that the heating temperature does not exceed the preset temperature threshold (ensuring that the temperature is controlled within a safe range). If the temperature of the lithium battery block 4 exceeds the preset temperature threshold, measures are taken immediately (the heating switch circuit is not closed) to stop heating, so that the temperature of the lithium battery block 4 is kept within the optimal operating temperature range.

[0031] The heating switch circuit includes a MOSFET Q8 and a transistor Q9. The gate of the MOSFET Q8 and the collector of the transistor Q9 are respectively connected to a resistor R15 and a series diode D5 and a diode D4. One end of the resistor R15 is connected to the source of the MOSFET Q8. The terminals of the diodes D5 and D4 are connected to a switch S1. One end of the switch S1 is connected to the emitter of the transistor Q9. The base of the transistor Q9 is connected to a resistor R16 and a resistor R14 connected in parallel.

[0032] MOSFET Q8 is the main switch of this circuit. When the gate voltage of MOSFET Q8 is lower than the source voltage, MOSFET Q8 is turned on. Transistor Q9 is the actuator of the control path, used to pull down the gate voltage of MOSFET Q8. Switch S1 is a push-button switch. Diodes (D4, D5) utilize their low forward voltage drop characteristics to provide level isolation and clamping protection. Resistor R15 is a pull-up resistor. When there is no main control signal, it pulls the gate voltage of MOSFET Q8 up to 5V through diode D5 to ensure that MOSFET Q8 is reliably turned off. Resistor R16 is a current-limiting resistor to prevent excessive control current from T1 / T2 and protect transistor Q9.

[0033] The temperature acquisition circuit includes connector P5 and amplifier U9. Pin 1 of connector P5 is connected to a resistor R17 and a capacitor C22 connected in series. Pin 2 of connector P5 is connected to pin 3 of amplifier U9, and pin 3 of connector P5 is connected to pin 2 of amplifier U9, and pin 4 of connector P5 is connected to pin 2 of amplifier U9, along with a resistor R26 and a capacitor C26 connected in series. Pin 1 and pin 8 of amplifier U9 are connected to a resistor R22.

[0034] Connector P5 is the signal input interface. Resistors R17 and R21 are input resistors, which serve to limit current or match impedance and protect the input stage of the op-amp. Resistor R22 is used to set the amplifier gain. Capacitor C22 is used to filter out unwanted high-frequency noise in the signal. Capacitor C24 is used to filter out high-frequency glitches in the output signal, making the signal smoother.

[0035] The weak differential signal from the temperature sensor enters the temperature acquisition circuit through connector P5. The signal first passes through an input network composed of components such as resistor R17, resistor R21, and capacitor C22. Capacitor C22 and resistor R17 are used to filter out high-frequency interference noise introduced from the environment. The pre-conditioned differential signal is sent to pins 2 and 3 of amplifier U9. The voltage at pin 5 (REF pin) of amplifier U9 determines the reference point of the amplified signal.

[0036] The temperature control circuit includes a voltage regulator U2, a MOSFET Q1, and a MOSFET Q2. A closed loop is formed between pin 3 of the voltage regulator U2 and the drain of the MOSFET Q1 by resistors R5 and R11 and LED LD2. A closed loop is formed between pin 3 of the voltage regulator U2 and the drain of the MOSFET Q2 by resistors R6 and R13 and LED LD3. Resistors R2 and R3, as well as resistor R4, capacitor C2, and capacitor C1 connected in parallel are also connected to pin 3 of the voltage regulator U2.

[0037] The gates of the MOS transistor Q1 are connected to resistors R7 and R9, respectively, and the gates of the MOS transistor Q2 are connected to resistors R8 and R10, respectively. The source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2.

[0038] A capacitor C5 and a capacitor C6 are connected in parallel between pin 1 and pin 3 of the voltage regulator U2, and a capacitor C7 and a capacitor C8 are connected in parallel between pin 2 and pin 4 of the voltage regulator U2.

[0039] The voltage input from pin 3 of regulator U2 is regulated and output as a stable 5V voltage from pin 2 (pin 4), which powers the subsequent circuits. Capacitor C1 is used to filter out low-frequency noise, capacitor C2 is used to filter out high-frequency noise, and capacitors C5 and C6 are both filter capacitors to ensure that the output 5V voltage is pure and stable.

[0040] Resistors R7 and R8 are small-value resistors connected to the input path, serving to limit current and match impedance, preventing signal overshoot. Resistors R9 and R10 are pull-up resistors, used to keep the gates of MOSFETs Q1 and Q2 at a known fixed level when the control signals (T1 / T2) are floating, preventing them from being mis-turned on due to interference.

[0041] Resistors R5, R6, R11, and R13 form a bias and voltage divider network to adjust the signal voltage input to T1 / T2 to a level suitable for driving the gates of MOSFETs Q1 and Q2.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control device for the heating circuit of a backup power lithium battery pack in a pitch control system, characterized in that: The battery housing (1) includes a built-in control board (9) and a mounting plate (2) mounted on the battery housing (1). A base (3) is installed inside the battery housing (1). A lithium battery block (4) is installed inside the base (3). A temperature control component (6) for heating the lithium battery block (4) is also installed inside the battery housing (1). The temperature control component (6) includes a graphene carbon crystal printed heating film (7), a heating switch circuit, and a temperature acquisition circuit for monitoring the temperature of the lithium battery block (4). The heating switch circuit, the temperature acquisition circuit, and the graphene carbon crystal printed heating film (7) are all electrically connected to the control board (9). The control board (9) integrates a temperature control circuit that compares the detected temperature of the lithium battery block (4) with a preset temperature.

2. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 1, characterized in that: The mounting plate (2) is provided with a pin seat (21) and a plug-in terminal (22). The battery casing (1) has a through hole one (11) and a through hole two (12) on one side. The pin seat (21) passes through the through hole one (11) and is connected to the control board (9). The plug-in terminal (22) passes through the through hole two (12) and is connected to the control board (9).

3. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 1, characterized in that: The battery casing (1) is also provided with a thermally conductive silicone sheet (5) and an epoxy resin plate (8). The temperature control component (6) is installed on the thermally conductive silicone sheet (5), and the epoxy resin plate (8) is located below the graphene carbon crystal printed heating film (7).

4. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 1, characterized in that: The heating switch circuit includes a MOSFET Q8 and a transistor Q9. The gate of the MOSFET Q8 and the collector of the transistor Q9 are respectively connected to a resistor R15 and a series diode D5 and a diode D4. One end of the resistor R15 is connected to the source of the MOSFET Q8. The terminals of the diodes D5 and D4 are connected to a switch S1. One end of the switch S1 is connected to the emitter of the transistor Q9. The base of the transistor Q9 is connected to a resistor R16 and a resistor R14 connected in parallel.

5. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 1, characterized in that: The temperature acquisition circuit includes connector P5 and amplifier U9. Pin 1 of connector P5 is connected to a resistor R17 and a capacitor C22 connected in series. Pin 2 of connector P5 is connected to pin 3 of amplifier U9, and pin 3 of connector P5 is connected to pin 2 of amplifier U9, and pin 4 of connector P5 is connected to pin 2 of amplifier U9, along with a resistor R26 and a capacitor C26 connected in series. Pin 1 and pin 8 of amplifier U9 are connected to a resistor R22.

6. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 1, characterized in that: The temperature control circuit includes a voltage regulator U2, a MOSFET Q1, and a MOSFET Q2. A closed loop is formed between pin 3 of the voltage regulator U2 and the drain of the MOSFET Q1 by resistors R5 and R11 and LED LD2. A closed loop is formed between pin 3 of the voltage regulator U2 and the drain of the MOSFET Q2 by resistors R6 and R13 and LED LD3. Resistors R2 and R3, as well as resistor R4, capacitor C2, and capacitor C1 connected in parallel are also connected to pin 3 of the voltage regulator U2.

7. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 6, characterized in that: The gates of the MOS transistor Q1 are connected to resistors R7 and R9, respectively, and the gates of the MOS transistor Q2 are connected to resistors R8 and R10, respectively. The source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2.

8. The control device for the heating circuit of the backup power lithium battery pack in a pitch system according to claim 7, characterized in that: A capacitor C5 and a capacitor C6 are connected in parallel between pin 1 and pin 3 of the voltage regulator U2, and a capacitor C7 and a capacitor C8 are connected in parallel between pin 2 and pin 4 of the voltage regulator U2.

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