Rechargeable battery management circuit and power supply device

Abstract

The utility model provides a rechargeable battery management circuit and a power supply device. The management circuit comprises a control processor, a charging switch, a discharging switch, a first temperature sensor and a second temperature sensor. The charging switch and the second charging switch are arranged on a power bus of the rechargeable battery, and the charging switch and the discharging switch are MOS tube switches; the first temperature sensor is used for detecting the temperature of the rechargeable battery, and the second temperature sensor is used for detecting the temperature of the charging switch and the discharging switch; the control processor is electrically connected with the charging switch, the discharging switch, the first temperature sensor and the second temperature sensor. The management circuit not only can monitor the temperature of the battery, but also can monitor the temperature of the charging and discharging switch, and the control processor dynamically adjusts the state of the charging and discharging switch according to the temperature of the charging and discharging switch, so that the risk of over-temperature damage of the charging and discharging switch is effectively avoided, and the safety and reliability of the whole battery management circuit are improved.

Description

Technical Field

[0001] The utility model relates to a battery management circuit, in particular to a rechargeable battery management circuit and a power supply device. Background Art

[0002] With the rapid development of application fields such as electronic devices and electric vehicles, lithium-ion batteries are increasingly widely used. In order to ensure the safety and lifespan of the battery, it is crucial to effectively manage the charging and discharging process of the lithium battery. The lithium battery management circuit plays a core role in this process, and its main functions include battery state monitoring, charge and discharge control, temperature detection, etc.

[0003] Most of the existing lithium battery management circuits have a basic battery temperature monitoring function, and a temperature sensor is used to detect the temperature of the battery in real time to prevent the battery from working under overheating conditions. However, these circuits are limited to monitoring the temperature of the battery itself and ignore the temperature change of the charge and discharge switch (usually a MOS transistor switch). During the long-term charging and discharging process, the MOS transistor switch generates heat due to the flowing current, which may cause the MOS transistor to be damaged due to overheating, especially when the overcurrent protection is not triggered. Specifically, when the lithium battery management circuit is performing long-term charging and discharging, although the temperature of the battery itself can be monitored and protected, the temperature of the MOS transistor switch is not monitored in real time. If the temperature of the MOS transistor is too high and not processed in time, it may lead to the damage of the MOS transistor, and even cause circuit failures or safety accidents. This design defect seriously affects the safety and reliability of the battery management system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rechargeable battery management circuit and a power supply device that can simultaneously monitor the battery temperature and the temperature of the switching tube to solve the above technical problems.

[0005] To achieve the above purpose, the utility model provides a rechargeable battery management circuit, which includes a control processor, a charging switch, a discharging switch, a first temperature sensor, and a second temperature sensor;

[0006] The charging switch and the discharging switch are arranged on the power bus of the rechargeable battery, and the charging switch and the discharging switch are MOS transistor switches;

[0007] The first temperature sensor is used to detect the temperature of the rechargeable battery, and the second temperature sensor is used to detect the temperature of the charging switch and the discharging switch;

[0008] The control processor is electrically connected to the charging switch, the discharging switch, the first temperature sensor, and the second temperature sensor. The control processor can control the states of the charging switch and the discharging switch according to the feedback from the first temperature sensor and the second temperature sensor.

[0009] Preferably, the second temperature sensor is disposed between the charging switch and the discharging switch.

[0010] Preferably, the rechargeable battery includes a plurality of battery cells electrically connected together, and a first temperature sensor is attached to the outer wall of each battery cell.

[0011] Preferably, a voltage collector for collecting the output voltage of the rechargeable battery is further included. One end of the voltage collector is electrically connected to the positive electrode of the rechargeable battery, and the other end of the voltage collector is electrically connected to the control processor.

[0012] Preferably, a current collector disposed on the power bus is further included, and the current collector is electrically connected to the control processor.

[0013] Preferably, a communication module circuit electrically connected to the control processor is further included.

[0014] Preferably, the communication module circuit includes a wireless communication circuit.

[0015] Preferably, the control processor includes an integrated analog front-end circuit.

[0016] The present invention further provides a power supply device, which includes a rechargeable battery and the rechargeable battery management circuit as described above that is electrically connected to the rechargeable battery.

[0017] Compared with the prior art, the rechargeable battery management circuit provided by the above technical solution of the present invention not only includes monitoring of the battery temperature, but also adds monitoring of the temperatures of the charging switch and the discharging switch. That is, the temperatures of the battery, the charging switch, and the discharging switch are respectively detected by the first temperature sensor and the second temperature sensor, and the control processor dynamically adjusts the states of the charging switch and the discharging switch according to the feedback from these two temperature sensors, thereby effectively avoiding the risk of over-temperature damage to the charging switch and the discharging switch, and improving the safety and reliability of the entire battery management circuit. Description of the Drawings

[0018] Figure 1 It is the circuit schematic diagram of the rechargeable battery management circuit in the embodiment of the present invention. Detailed Embodiments

[0019] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0020] The present embodiment discloses a rechargeable battery management circuit for dynamically managing the charging and discharging of the rechargeable battery to improve the working performance and safety performance of the rechargeable battery.

[0021] like Figure 1 The management circuit includes a control processor MCU, a charging switch K1, a discharging switch K2, a first temperature sensor T1 and a second temperature sensor T2.

[0022] The charging switch K1 and the discharging switch K2 are arranged on the power bus L of the rechargeable battery BT, and the charging switch K1 and the discharging switch K2 are MOS tube switches.

[0023] The first temperature sensor T1 is used to detect the temperature of the rechargeable battery BT, and the second temperature sensor T2 is used to detect the temperatures of the charging switch K1 and the discharging switch K2.

[0024] The control processor MCU is electrically connected to the charging switch K1, the discharging switch K2, the first temperature sensor T1 and the second temperature sensor T2. The control processor MCU can control the states of the charging switch K1 and the discharging switch K2 according to feedback from the first temperature sensor T1 and the second temperature sensor T2.

[0025] The management circuit disclosed in this embodiment not only includes monitoring of the temperature of the rechargeable battery BT, but also adds monitoring of the temperature of the charging switch K1 and the discharging switch K2, that is, the first temperature sensor T1 and the second temperature sensor T2 respectively detect the temperature of the rechargeable battery BT, the charging switch K1 and the discharging switch K2, and the control processor MCU dynamically adjusts the state of the charging switch K1 and the discharging switch K2 according to the feedback of the two temperature sensors. Specifically, when the state of the rechargeable battery BT does not reach the overcurrent protection interval, but the temperature value continuously detected by the second temperature sensor T2 exceeds the preset temperature threshold TM (for example, TM = 90°C), the charging switch K1 and the discharging switch K2 are controlled to be disabled at the same time, and the charging switch K1 and the discharging switch K2 are turned off. When the temperature of the charging switch K1 and the discharging switch K2 cools to the recovery threshold TMH (for example, when TMH = 80°C), the temperature fault is relieved, allowing the charging or discharging function to be restored under the condition of no battery fault. It can be seen that the above management circuit effectively avoids the risk of over-temperature damage to the charging switch K1 and the discharging switch K2, and improves the safety and reliability of the entire battery management circuit.

[0026] On the other hand, the second temperature sensor T2 is disposed between the charging switch K1 and the discharging switch K2 to simultaneously detect the temperatures of the charging switch K1 and the discharging switch K2.

[0027] On the other hand, the rechargeable battery BT includes a number of battery cells electrically connected together, and a first temperature sensor T1 is attached to the outer wall of each battery cell, so as to detect the temperature of each battery cell respectively. When the temperature of any battery cell is abnormal, the charging switch K1 and the discharging switch K2 can be turned off.

[0028] On the other hand, the management circuit further includes a voltage collector U1 for collecting the output voltage of the rechargeable battery BT. One end of the voltage collector U1 is electrically connected to the positive terminal of the rechargeable battery BT, and the other end of the voltage collector U1 is electrically connected to the control processor MCU. In this embodiment, through the setting of the voltage collector U1, the voltage of the rechargeable battery BT can be monitored in real time.

[0029] On the other hand, the management circuit further includes a current collector A1 provided on the power bus L, and the current collector A1 is electrically connected to the control processor MCU. In this embodiment, through the setting of the current collector A1, the charging and discharging currents of the rechargeable battery BT can be monitored in real time to further improve the safety performance of the rechargeable battery BT.

[0030] On the other hand, the management circuit further includes a communication module circuit CO electrically connected to the control processor MCU, so as to facilitate communication between the management circuit and other external devices and facilitate unified management of the rechargeable battery BT.

[0031] Specifically, the communication module circuit CO includes a wireless communication circuit to facilitate remote monitoring of the rechargeable battery BT.

[0032] On the other hand, the control processor MCU in the above embodiment includes an integrated analog front-end circuit, that is, an AFE chip.

[0033] In another embodiment of the present invention, a power supply device is further disclosed, which includes a rechargeable battery and a rechargeable battery BT management circuit having the above structure and electrically connected to the rechargeable battery BT.

[0034] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A rechargeable battery management circuit, characterized in that, It includes a control processor, a charging switch, a discharging switch, a first temperature sensor and a second temperature sensor; The charging switch and the discharging switch are arranged on the power bus of the rechargeable battery, and the charging switch and the discharging switch are MOS transistor switches; The first temperature sensor is used to detect the temperature of the rechargeable battery, and the second temperature sensor is used to detect the temperatures of the charging switch and the discharging switch; The control processor is electrically connected to the charging switch, the discharging switch, the first temperature sensor and the second temperature sensor, and the control processor can control the states of the charging switch and the discharging switch according to the feedbacks of the first temperature sensor and the second temperature sensor.

2. The rechargeable battery management circuit according to claim 1, wherein The second temperature sensor is arranged between the charging switch and the discharging switch.

3. The rechargeable battery management circuit according to claim 1, wherein, The rechargeable battery includes a plurality of battery cells electrically connected together, and one of the first temperature sensors is attached to the outer wall of each battery cell.

4. The rechargeable battery management circuit according to claim 1, characterized in that, It further includes a voltage collector for collecting the output voltage of the rechargeable battery. One end of the voltage collector is electrically connected to the positive terminal of the rechargeable battery, and the other end of the voltage collector is electrically connected to the control processor.

5. The rechargeable battery management circuit according to claim 1, wherein It further includes a current collector arranged on the power bus, and the current collector is electrically connected to the control processor.

6. The rechargeable battery management circuit according to claim 1, characterized in that It further includes a communication module circuit electrically connected to the control processor.

7. The rechargeable battery management circuit according to claim 6, wherein The communication module circuit includes a wireless communication circuit.

8. The rechargeable battery management circuit according to claim 1, wherein The control processor includes an integrated analog front-end circuit.

9. A power supply device, characterized in that, It includes a rechargeable battery and a rechargeable battery management circuit as described in any one of claims 1 to 8 and electrically connected to the rechargeable battery.

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