Control circuit and battery management system for a battery module

Abstract

This utility model relates to the field of display technology and provides a control circuit and battery management system for a battery module. The control circuit includes: a temperature control unit disposed on the charging path of the battery module, which senses the ambient temperature and connects or disconnects the charging path based on the ambient temperature; and a processing unit that monitors the ambient temperature, the battery temperature of the battery module, and the internal resistance of the battery module in real time, and outputs an electrical level signal to the temperature control unit. A valid electrical level signal controls the temperature control unit to maintain the charging path in an connected state, while an invalid electrical level signal controls the temperature control unit to maintain the charging path in a disconnected state. Therefore, the circuit chip can operate normally at low temperatures, while improving battery safety and reliability, and enhancing customer service.

Description

Technical Field

[0001] This utility model relates to the field of display technology, specifically to a control circuit and battery management system for a battery module. Background Technology

[0002] With the development of battery technology, lithium-ion batteries have gradually become the mainstream product due to their high specific energy, high voltage, and low pollution characteristics. The negative electrode materials of lithium-ion batteries mainly include carbon-based materials, nitrides, silicon-based materials, tin-based materials, and various new alloys. Among them, carbon-based materials are mainly used in practice, while other materials are mostly in the laboratory research stage.

[0003] Because lithium titanate (Li4Ti5O12, LTO) batteries have advantages such as high safety, high energy density, long service life, energy saving and environmental protection, and good high and low temperature characteristics, they are widely used in new energy vehicles, electric motorcycles and some high-end application fields with high requirements for safety, flexibility, high stability and long life.

[0004] However, when lithium titanate (LTO) is used as the negative electrode material in batteries, it easily generates gas during charge-discharge cycles due to its reaction with the electrolyte. Ordinary lithium titanate batteries are prone to gas buildup, leading to battery bulging. Once a lithium-ion battery bulges, the contact between the positive and negative electrodes weakens, significantly increasing the battery's internal resistance. Therefore, in low-temperature environments, the usable capacity of lithium battery packs in new energy vehicles drops sharply, directly impacting the electric vehicle's range. Furthermore, charging the lithium battery pack becomes more difficult, resulting in a significant decrease in output power, and in severe cases, failing to meet normal operating conditions, thus compromising the vehicle's normal operation.

[0005] Today, customer demands are increasing with market development, requiring performance to adapt to various complex environments. In particular, the operating temperature requirements in low-temperature environments are gradually decreasing. However, ordinary circuit chips (ICs) with other functions can generally only support normal operation at -30℃, and low-temperature testing chips can only support up to -40℃. If the circuit chips cannot support these conditions in even harsher weather, they may malfunction, resulting in display problems such as screen flickering and abnormal images. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a control circuit and battery management system for battery modules, which enables circuit chips to operate normally at low temperatures, while improving battery safety and reliability, and enhancing customer service.

[0007] On the one hand, this utility model provides a control circuit for a battery module, which includes:

[0008] A temperature control unit is installed on the charging path of the battery module. The temperature control unit senses the ambient temperature and connects or disconnects the charging path of the battery module according to the ambient temperature.

[0009] The processing unit is connected to the temperature control unit and the battery module respectively. It is used to monitor the ambient temperature, the battery temperature of the battery module and the internal resistance of the battery module in real time, and output a level signal to the temperature control unit. The valid level signal controls the temperature control unit to maintain the charging path in a connected state, and the invalid level signal controls the temperature control unit to maintain the charging path in a disconnected state.

[0010] Preferably, the temperature control unit includes:

[0011] A first thermistor and a first resistor are connected in series between the power supply terminal and ground. The connection node of the two provides a voltage divider node voltage, which changes with the change of the ambient temperature.

[0012] A switching transistor is located on the charging path. The control terminal of the switching transistor is connected to the connection node of the first thermistor and the first resistor, and the processing unit, respectively, and receives the voltage of the voltage divider node and the level signal.

[0013] The voltage divider node voltage or the effective level signal is used to maintain the conduction state of the switch transistor, thereby maintaining the continuity of the charging path.

[0014] An invalid level signal is used to maintain the off state of the switch transistor, thereby maintaining the disconnected state of the charging path.

[0015] Preferably, the temperature control unit further includes:

[0016] The second thermistor is connected between the second terminal of the switching transistor and the battery module, and the first terminal of the switching transistor is connected to the power supply terminal.

[0017] Preferably, the switching transistor is a P-channel metal-oxide-semiconductor field-effect transistor.

[0018] Preferably, the valid level signal is a low level signal, and the invalid level signal is a high level signal.

[0019] Preferably, the control circuit further includes:

[0020] The first voltage regulator unit includes a first diode and a first capacitor. The positive terminal of the first diode is grounded, and the negative terminal is connected to the power supply terminal and the first terminal of the first thermistor, respectively. The first capacitor is connected in parallel across the two ends of the first diode.

[0021] Preferably, the control circuit further includes:

[0022] The second voltage regulator unit includes a second diode and a second capacitor. The positive terminal of the second diode is grounded, and the negative terminal is connected to the first terminal of the first thermistor and the first terminal of the switching transistor, respectively. The second capacitor is connected in parallel across the two ends of the second diode.

[0023] Preferably, the control circuit further includes:

[0024] The third voltage regulator unit includes a third diode and a third capacitor. The positive terminal of the third diode is grounded, and the negative terminal is connected to the intermediate node between the second thermistor and the battery module. The third capacitor is connected in parallel across the two ends of the third diode.

[0025] Preferably, the temperature control unit, the first voltage regulator unit, the second voltage regulator unit, and the third voltage regulator unit are integrated on the same packaged chip.

[0026] On the other hand, this utility model also provides a battery management system, which includes the control circuit for the battery module as described above.

[0027] The beneficial effects of this utility model are as follows: The control circuit and battery management system for battery modules provided by this utility model utilize a temperature control unit to sense the ambient temperature. During the ambient temperature sensing stage, the resistance of the thermistor increases as the temperature decreases, causing the voltage at the voltage divider node to decrease until a preset threshold is reached, at which point the switching transistor is turned on to connect the input voltage to the charging path of the battery module. The heat generated during battery charging controls the rise in ambient temperature of the circuit chip, ensuring normal operation of the circuit chip at low temperatures. During this process, the processing unit monitors the ambient temperature, the battery temperature of the battery module, and the internal resistance of the battery module in real time. During the switching transistor's conduction stage, it provides an effective level signal generated by the processing unit to the control terminal of the switching transistor to maintain the switching transistor's conduction state. After the ambient temperature reaches the preset safe temperature, it outputs an invalid level signal to turn off the switching transistor. This enables the circuit chip to operate normally at low temperatures, preventing various abnormal problems caused by low temperatures, thereby improving battery safety and reliability, and enhancing customer service. Attached Figure Description

[0028] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings.

[0029] Figure 1 This diagram shows a schematic of the control circuit for a battery module provided in an embodiment of the present invention.

[0030] Figure 2 Show Figure 1 The schematic diagram of the control circuit shown is shown.

[0031] Figure 3 The diagram shows a curve illustrating the relationship between the resistance of a thermistor and temperature. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in various forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] Lithium titanate (Li4Ti5O12, LTO) is a material used as the negative electrode in lithium-ion batteries. It can be combined with positive electrode materials such as lithium manganese oxide, ternary materials, or lithium iron phosphate to form 2.4V or 1.9V lithium-ion secondary batteries. Furthermore, it can also be used as a positive electrode, combined with metallic lithium or lithium alloy negative electrodes to form 1.5V lithium secondary batteries. Advantages of fast-charging and discharging batteries: 1. Lithium titanate batteries have a higher potential than metallic lithium, making them less prone to lithium dendrite formation and ensuring stable discharge voltage. Therefore, they are highly safe and will not catch fire or explode even under extreme conditions (puncture, crushing, drop, fire, etc.). 2. The three-dimensional spinel structure of lithium titanate batteries provides unique three-dimensional lithium-ion diffusion channels. Compared to other lithium batteries, lithium titanate batteries exhibit better high and low temperature characteristics, capable of normal charging and discharging at temperatures ranging from -50°C to 60°C. Their high and low temperature performance is excellent, especially at low temperatures. 3. Lithium titanate is also known as a "zero-strain material," preventing structural changes caused by expansion and contraction during charging and discharging. This improves electrode performance, reduces significant capacity decay, and results in an ultra-long cycle life of 10,000-20,000 cycles. 4. Compared to carbon anode materials, lithium titanate batteries have a higher lithium-ion diffusion coefficient, faster charging and discharging (up to 8C rate), and strong thermal stability.

[0035] As the market develops, people are pursuing diversified functions while paying more attention to performance requirements that can adapt to various complex environments. In particular, the operating temperature requirements in low-temperature environments are gradually decreasing. However, ordinary circuit chips for other functions can generally only support normal operation at -30℃, and low-temperature testing chips can only support up to -40℃. If the circuit chips in electric vehicles using battery modules composed of lithium titanate batteries cannot support this in even harsher (lower) weather conditions, they may malfunction, causing problems such as screen flickering and abnormal display, as well as affecting battery performance and battery life.

[0036] Based on this, this utility model embodiment proposes a control circuit and a battery management system for a battery module, aiming to enable the circuit chip to operate normally at low temperatures, thereby improving the safety and reliability of the battery and enhancing the service effect for customers.

[0037] The present invention will now be described in detail with reference to the accompanying drawings.

[0038] Figure 1 This diagram shows a structural schematic of the control circuit for a battery module provided in an embodiment of the present invention. Figure 2 Show Figure 1 The schematic diagram of the control circuit shown is shown. Figure 3 The diagram shows a curve illustrating the relationship between the resistance of a thermistor and temperature.

[0039] refer to Figure 1 and Figure 2 This utility model provides a control circuit 100 for LTO battery module, which includes at least a temperature control unit 130 and a processing unit 150.

[0040] The temperature control unit 130 is disposed on the charging path of the battery module LTO. The temperature control unit 130 senses the ambient temperature and connects or disconnects the charging path of the battery module LTO according to the ambient temperature. Specifically, when the ambient temperature Ta is sensed, the temperature control unit 130 turns on the switch PM1 when the voltage divider node voltage VA reaches a preset threshold, connecting the input voltage Vin to the charging path of the battery module. In this embodiment, the preset threshold is, for example, the turn-on voltage of the switch PM1.

[0041] The processing unit 150 is connected to the temperature control unit 130 and the battery module LTO respectively, and is used to monitor the ambient temperature Ta, the battery temperature Tb of the battery module LTO and the internal resistance RLTO of the battery module LTO in real time, and to provide the valid level signal VB generated by the processing unit 150 to the control terminal of the switching transistor PM1 during the conduction phase of the switching transistor PM1 to maintain the conduction state of the switching transistor PM1, and to output an invalid level signal VB to turn off the switching transistor PM1 after the ambient temperature Ta reaches the preset safe temperature.

[0042] refer to Figure 2 In some embodiments, the temperature control unit 130 further includes: a first thermistor R1 and a first resistor R3, and a second thermistor R2.

[0043] The first thermistor R1 and the first resistor R3 are connected in series between the power supply terminal and ground. The voltage divider node connected to them is connected to the control terminal of the switching transistor PM1 to provide the voltage divider node voltage VA. The voltage divider node voltage VA changes with the change of the ambient temperature Ta.

[0044] In this embodiment, the emphasis is on enabling the circuit chip (control circuit 100) to operate normally in low-temperature environments. Therefore, in some embodiments, negative temperature coefficient thermistors (NTC thermistors) are selected. The resistance of the first thermistor R1 increases as the temperature decreases. Consequently, the voltage divider node voltage VA decreases as the ambient temperature Ta decreases. Figure 3 As shown, Figure 3 The curve shows the resistance of a thermistor versus temperature. The lower the temperature, the higher the thermistor resistance. The B-value of the thermistor refers to the rate at which its resistance changes with temperature within a certain temperature range; a higher B-value indicates greater sensitivity to temperature changes. Therefore, the voltage drop across the thermistor can be used to control the switching on and off of the switching transistor PM1.

[0045] It should be noted that the thermistor can also be a positive temperature coefficient thermistor (PTC thermistor). In other alternative embodiments, if the emphasis is on enabling the circuit chip (control circuit 100) to operate normally in a high-temperature environment, the circuit design for temperature regulation can be adjusted according to the requirements, and no restrictions are imposed here.

[0046] In a further embodiment, different control circuits can be set for low-temperature and high-temperature environments respectively to meet the needs of customers in different working environments, improve the applicable temperature range of the circuit chip, improve the adaptability and compatibility of the product, and thus improve the market competitiveness of the product.

[0047] In this embodiment, the first end of the second thermistor R2 is connected to the second end of the switching transistor PM1, the second end of the second thermistor R2 is connected to the battery module LTO to ground, the first end of the switching transistor PM1 is connected to the power supply terminal, and the control terminal of the switching transistor PM1 is connected to the voltage divider node and the processing unit 150 respectively. The voltage divider node voltage VA or the valid level signal VB is used to maintain the conducting state of the switching transistor PM1, and the invalid level signal VB is used to maintain the turning state of the switching transistor PM1.

[0048] In some embodiments, the switching transistor PM1 is a P-channel metal-oxide-semiconductor field-effect transistor (MOSFET, hereinafter referred to as MOS transistor). In this embodiment, the first terminal of the PMOS switching transistor PM1 is the source terminal, the second terminal is the drain terminal, and the control terminal is the gate terminal.

[0049] In some embodiments, the valid level signal VB is a low level signal, and the invalid level signal VB is a high level signal.

[0050] Combination Figure 1 and Figure 2 In some embodiments, the control circuit 100 further includes a first voltage regulator unit 110, a second voltage regulator unit 120, and a third voltage regulator unit 140.

[0051] The first voltage regulator unit 110 includes a first diode D1 and a first capacitor C1. The positive terminal of the first diode D1 is grounded, and the negative terminal is connected to the power supply terminal and the first terminal of the first thermistor R1, respectively. The first capacitor C1 is connected in parallel across the two ends of the first diode D1.

[0052] The second voltage regulator unit 120 includes a second diode D2 and a second capacitor C2. The positive terminal of the second diode D2 is grounded, and the negative terminal is connected to the first terminal of the first thermistor R1 and the first terminal of the switching transistor PM1, respectively. The second capacitor C2 is connected in parallel across the two ends of the second diode D2.

[0053] The third voltage regulator unit 140 includes a third diode D3 and a third capacitor C3. The positive terminal of the third diode D3 is grounded, and the negative terminal is connected to the intermediate node between the second thermistor R2 and the battery module LTO. The third capacitor C3 is connected in parallel across the two ends of the third diode D3.

[0054] In this embodiment, the reverse grounding of the diodes in each of the above-mentioned voltage regulation units mainly serves the functions of voltage regulation and protection, while the capacitors also play a role in cooperating with voltage regulation and signal protection.

[0055] In a further embodiment, for example, the temperature control unit 130, the first voltage regulator unit 110, the second voltage regulator unit 120 and the third voltage regulator unit 140 are integrated on the same packaged chip.

[0056] Of course, each voltage regulator unit can balance signal accuracy requirements and integration level according to the integration size requirements, or at least one of them can be integrated into the circuit chip. There are no restrictions here.

[0057] exist Figure 2 In the control circuit 100 shown, the first thermistor R1 can be used as a real-time sensing circuit ambient temperature Ta (which can refer to the operating temperature of the circuit chip). When an ambient temperature of -40°C or lower is detected, the resistance of the first thermistor R1 increases, and the voltage division in the series path of the first thermistor R1 and the first resistor R3 increases accordingly. The voltage division node voltage VA of the intermediate node connecting the two decreases accordingly. Since the switch PM1 is a PMOS transistor, it conducts at low voltage. Therefore, the conduction voltage of the switch PM1 is used as the aforementioned preset threshold. When the voltage division node voltage VA decreases to the preset threshold, the switch PM1 is turned on, which also turns on the charging path from the power supply terminal to the battery module LTO. Subsequently, the processing unit 150 detects that the switch PM1 is turned on, generates an effective level signal VB, and provides it to the control terminal of the switch PM1 to maintain the conduction stage of the switch PM1.

[0058] The battery module LTO generates heat during charging, causing the battery temperature Tb to rise and the ambient temperature Ta to rise. The second thermistor R2 senses the ambient temperature Ta and its resistance changes accordingly. Then, by adjusting the internal resistance RLTO of the battery module LTO in conjunction with the thermistor 2, the ambient temperature Ta of the circuit chip is continuously increased. During this process, the resistance of the first thermistor R1 begins to decrease as the ambient temperature Ta increases. Correspondingly, the voltage divider node voltage VA begins to increase. However, because the effective level signal VB is continuously supplied, the increased voltage divider node voltage VA does not affect the conduction state of the switching transistor PM1.

[0059] As the ambient temperature Ta continues to rise, the processing unit 150 continues to monitor the internal resistance PLTO of the battery module LTO in real time, in order to coordinate with the change in the resistance value of the second thermistor R2, so that the ambient temperature Ta rises until the ambient temperature Ta reaches the preset safe temperature so that the circuit chip can work normally. When the processing unit 150 detects that the ambient temperature Ta has reached the safe temperature, it outputs an invalid level signal VB (high level signal) to turn off the switching transistor PM1, so that the charging path of the battery module LTO is cut off, and the control circuit 100 stops working.

[0060] It is known that the internal resistance of a lithium titanate battery (LTO battery module) is adjustable. The internal resistance of a lithium titanate battery can be adjusted through various technical means during the design and manufacturing process. For example, by improving the battery's structural design, such as waterproof structures for connecting electrodes, elastically compensated and shock-resistant series connection structures, and non-welded lead structures, the battery's internal resistance can be effectively managed. Furthermore, by designing battery protection circuits and battery voltage divider resistors on the battery protection board, the internal resistance of the lithium titanate battery can also be adjusted. In this embodiment, for example, adjusting the battery voltage divider resistor can achieve the purpose of adjusting the internal resistance RLTO of the LTO battery module, improving the control accuracy of the circuit, as well as its stability and safety.

[0061] It is important to note that while the internal resistance of lithium titanate batteries can be adjusted using these techniques, the specific value of the internal resistance is also affected by factors such as battery materials, manufacturing processes, and usage conditions. Therefore, by using the processing unit 150 to monitor the battery temperature Tb and the internal resistance PLTO of the battery module LTO in real time, it is possible to safely and effectively adjust the temperature rise of the ambient temperature Ta of the circuit chips.

[0062] The performance of lithium battery packs is closely related to the ambient temperature. Short-term use in low-temperature environments, or where the temperature is not low enough, will only temporarily affect the battery capacity, but will not cause long-term damage. However, prolonged use in low-temperature environments will cause long-term damage to the lithium battery pack.

[0063] Furthermore, charging lithium-ion batteries at low temperatures causes metallic lithium to deposit on the battery surface, and this process is irreversible. This can cause long-term damage to the lithium battery pack and reduce battery safety.

[0064] Therefore, the control circuit 100 for LTO of battery module provided in this embodiment of the present invention can realize the normal operation of circuit chips at low temperatures, prevent various abnormal problems caused by abnormal operation of circuit chips due to low temperature, thereby improving the safety and reliability of batteries in electric vehicles and enhancing the service effect for customers.

[0065] Of course, this utility model is not limited to this. In other mobile terminals and electronic devices that use lithium titanate batteries, the control circuit described above can also achieve the aforementioned beneficial effects. These will not be elaborated on here.

[0066] Drawing on the same inventive concept, this utility model also provides a battery management system (not shown) that includes the control circuit 100 for a battery module LTO as described above, and thus also has the aforementioned beneficial effects.

[0067] The beneficial effects of this utility model are as follows: The control circuit 100 and battery management system for the LTO battery module provided in this utility model embodiment can utilize the temperature control unit 130 to sense the ambient temperature Ta. During this stage, the resistance of the thermistors (R1 and R2) increases as the temperature decreases, causing the voltage divider node voltage VA to decrease until it reaches a preset threshold. At this point, the switching transistor PM1 is turned on to connect the input voltage Vin to the charging path of the LTO battery module. The heat generated during battery charging is used to control the rise in the ambient temperature Ta of the circuit chip, ensuring the normal operation of the circuit chip at low temperatures. During this process, the processing unit 150... The system monitors the ambient temperature Ta, the battery temperature Tb of the battery module LTO, and the internal resistance RLTO of the battery module LTO in real time. During the conduction phase of the switching transistor PM1, it provides an effective level signal VB to the control terminal of the switching transistor PM1 to maintain the conduction state of the switching transistor PM1. After the ambient temperature Ta reaches the preset safe temperature, it outputs an invalid level signal VB to turn off the switching transistor PM1. This enables the circuit chip to work normally at low temperatures, prevents various abnormal problems caused by the abnormal operation of the circuit chip due to low temperature, thereby improving the safety and reliability of the battery and enhancing the service effect for customers.

[0068] It should be noted that in the description of this utility model, the terms "upper", "lower", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0069] Furthermore, throughout this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0070] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A control circuit for a battery module, characterized in that, include: The temperature control unit includes a switching transistor disposed on the charging path of the battery module, a first thermistor and a first resistor connected in series between the power supply terminal and ground, the connection node of the first thermistor and the first resistor provides a voltage divider node voltage to the control terminal of the switching transistor, the temperature control unit senses the ambient temperature and connects or disconnects the charging path of the battery module according to the ambient temperature, and the voltage divider node voltage is used to maintain the conducting state of the switching transistor, thereby maintaining the connection state of the charging path; The processing unit is connected to both the temperature control unit and the battery module. It monitors the ambient temperature, the battery temperature of the battery module, and the internal resistance of the battery module in real time, and outputs a voltage level signal to the temperature control unit. The processing unit is connected to the switching transistor. The processing unit detects the conduction state of the switching transistor and provides a valid voltage level signal to the control terminal of the switching transistor during the conduction phase. The valid voltage level signal controls the temperature control unit to maintain the continuity of the charging path. The processing unit also provides an invalid level signal to the control terminal of the switching transistor after the ambient temperature is greater than or equal to the safe temperature. The invalid level signal controls the temperature control unit to maintain the off state of the charging path.

2. The control circuit for a battery module according to claim 1, wherein The temperature control unit also includes: The second thermistor is connected between the second terminal of the switching transistor and the battery module, and the first terminal of the switching transistor is connected to the power supply terminal.

3. The control circuit for a battery module according to claim 2, wherein The switching transistor is a P-channel metal-oxide-semiconductor field-effect transistor.

4. The control circuit for a battery module according to claim 3, wherein The valid level signal is a low level signal, and the invalid level signal is a high level signal.

5. The control circuit for a battery module according to claim 4, wherein Also includes: The first voltage regulator unit includes a first diode and a first capacitor. The positive terminal of the first diode is grounded, and the negative terminal is connected to the power supply terminal and the first terminal of the first thermistor, respectively. The first capacitor is connected in parallel across the two ends of the first diode.

6. The control circuit for a battery module according to claim 5, wherein Also includes: The second voltage regulator unit includes a second diode and a second capacitor. The positive terminal of the second diode is grounded, and the negative terminal is connected to the first terminal of the first thermistor and the first terminal of the switching transistor, respectively. The second capacitor is connected in parallel across the two ends of the second diode.

7. The control circuit for a battery module according to claim 6, wherein Also includes: The third voltage regulator unit includes a third diode and a third capacitor. The positive terminal of the third diode is grounded, and the negative terminal is connected to the intermediate node between the second thermistor and the battery module. The third capacitor is connected in parallel across the two ends of the third diode.

8. The control circuit for a battery module according to claim 7, characterized in that, The temperature control unit, the first voltage regulator unit, the second voltage regulator unit, and the third voltage regulator unit are integrated on the same packaged chip.

9. A battery management system, characterized by, Includes a control circuit for a battery module as described in any one of claims 1 to 8.

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