Battery pack with temperature and humidity detection function

Abstract

The invention discloses a battery pack with a temperature and humidity detection function, the battery pack with the temperature and humidity detection function comprises a box body, a battery module and a battery management system, the battery module and the battery management system are both arranged in the box body, and the battery management system is electrically connected with the battery module. The battery management system comprises a master control module, a slave control module and a CAN bus communication circuit. The main control module comprises a main control chip and an environment temperature and humidity acquisition circuit; the environment temperature and humidity acquisition circuit comprises a first temperature sensor and a humidity sensor, the first temperature sensor adopts a Bluetooth temperature sensor, the humidity sensor adopts a Bluetooth humidity sensor, and the first temperature sensor and the humidity sensor can be in wireless communication connection with the main control chip. The first temperature sensor and the humidity sensor can directly transmit temperature and humidity data in the box body to the main control chip for analysis and utilization, and meanwhile, interactive feedback to an operator is facilitated through an external data receiving and interaction device.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery packs, and in particular to a battery pack with temperature and humidity detection functions. Background Art

[0002] The battery management system (BMS) of the battery pack is a key component to ensure the safe, efficient and long-term reliable operation of the battery pack. The battery management system has the functions of battery monitoring, status evaluation, balancing management, safety protection and external communication. Specifically, the battery management system can detect the voltage, current, temperature and status of the battery in real time to ensure operation within a safe range; secondly, it can calculate the battery's charge state, health state and temperature state to provide accurate battery status information; it can also balance the battery cells and prevent a battery cell from being overcharged or over-discharged to extend the life of the entire battery pack; in abnormal situations such as battery overvoltage, undervoltage, overcurrent, short circuit, etc., the battery management system can automatically cut off the power supply to protect the battery and its application equipment; the battery management system can communicate data with external devices such as chargers and controllers to achieve more efficient battery management. The core components of the existing battery management system generally include voltage and current sensors, temperature sensors, microcontroller units, balancing circuits and communication modules. Among them, the battery management system monitors the operating temperature of the battery through a temperature sensor to prevent overheating.

[0003] In existing battery pack applications, the ambient temperature and humidity of the battery pack will have a certain impact on its working state. For example, in two different environments, warm and humid and cold and dry, the intensity of the internal reaction of the battery will be different when working, which will have a certain impact on the temperature, safety and reliability of the single battery, and will affect the estimation of the battery SOC. Therefore, the collection of ambient temperature and humidity is very necessary in the battery management system. However, the existing battery pack has a single monitoring method for ambient temperature and humidity changes and the feedback speed is slow, which makes the battery pack and battery management system not respond to the changes in ambient temperature and humidity in a timely manner. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack with temperature and humidity detection function to address the technical problems that the existing battery packs have a single monitoring method for environmental temperature and humidity changes and insufficient feedback speed.

[0005] A battery pack with a temperature and humidity detection function, the battery pack with the temperature and humidity detection function comprises a box, a battery module and a battery management system, the battery module and the battery management system are both arranged inside the box, the battery management system is electrically connected to the battery module, wherein the battery management system comprises a master control module, a slave control module and a CAN bus communication circuit, the master control module is communicatively connected to the CAN bus communication circuit; the slave control module is communicatively connected to the CAN bus communication circuit.

[0006] The main control module includes a main control chip and an ambient temperature and humidity acquisition circuit. The main control chip is communicatively connected to the CAN bus communication circuit. The acquisition end of the ambient temperature and humidity acquisition circuit is arranged inside the box, and the output end of the ambient temperature and humidity acquisition circuit is electrically connected to the input end of the main control chip.

[0007] The environmental temperature and humidity acquisition circuit includes a first temperature sensor and a humidity sensor, both of which are arranged inside the box; the first temperature sensor and the humidity sensor are respectively connected to the main control chip for communication.

[0008] The first temperature sensor adopts a Bluetooth temperature sensor, and the humidity sensor adopts a Bluetooth humidity sensor, so that the first temperature sensor and the humidity sensor can be wirelessly connected to the main control chip.

[0009] In one of the embodiments, the above-mentioned environmental temperature and humidity acquisition circuit also includes a temperature and humidity sensor, which is arranged inside the box, and the output end of the temperature and humidity sensor is electrically connected to the input end of the main control chip.

[0010] In one embodiment, the temperature and humidity sensor is configured as SHT31 and is electrically connected to a pull-up resistor R1, thereby forming an environmental temperature and humidity sensor circuit to stably transmit data signals to the main control chip.

[0011] In one of the embodiments, the main control module further includes a USB power circuit, and an output end of the USB power circuit is electrically connected to an input end of the main control chip, so that the USB power circuit can supply power to the main control module through the main control chip.

[0012] In one embodiment, the main control module further includes a power decoupling circuit, and the power decoupling circuit is arranged at the power supply end of the main control chip.

[0013] In one of the embodiments, the above-mentioned main control module also includes a clock circuit and a reset circuit, and the clock circuit and the reset circuit are electrically connected to the main control chip respectively; wherein, the clock circuit can provide a time reference for the battery management system as a reference for the system working sequence to ensure that the battery management system can perform various tasks stably and orderly; the reset circuit can restore the battery management system to the starting state and restart operation with one click when the operating state of the battery management system does not meet the expected effect.

[0014] In one embodiment, the main control module further includes an alarm circuit, and an input end of the alarm circuit is electrically connected to an output end of the main control chip.

[0015] In one embodiment, the alarm circuit uses a buzzer PKLCS1212E2 and an LED lamp PC56H19-V1 as an alarm unit.

[0016] In one of the embodiments, the above-mentioned battery management system also includes a USB serial port communication circuit, one end of the USB serial port communication circuit is communicated with the main control chip, and the other end of the USB serial port communication circuit is communicated with the external host computer, thereby realizing the communication connection between the battery management system and the external host computer.

[0017] In one of the embodiments, the main control module further includes a storage backup circuit, and the storage backup circuit is electrically connected to the main control chip.

[0018] In one embodiment, the above-mentioned slave control module includes a slave control chip, a voltage acquisition circuit, a current acquisition circuit and a temperature acquisition circuit. The slave control chip is communicatively connected to the CAN bus communication circuit, and the input end of the slave control chip is electrically connected to the output end of the voltage acquisition circuit, the output end of the current acquisition circuit and the output end of the temperature acquisition circuit, respectively. The input end of the voltage acquisition circuit, the input end of the voltage acquisition circuit and the input end of the temperature acquisition circuit are electrically connected to the battery module respectively.

[0019] In one embodiment, the temperature acquisition circuit includes a second temperature sensor, and the second temperature sensor acquires the temperature of the single battery of the battery module.

[0020] In one embodiment, the second temperature sensor is TMP117 and is electrically connected to a pull-up resistor R2 to form a temperature acquisition circuit to stably transmit data signals to the slave control chip.

[0021] In summary, the battery pack with temperature and humidity detection function disclosed in the present invention can collect data on the ambient temperature and humidity inside the box through the ambient temperature and humidity acquisition circuit, and then transmit it to the main control chip, so as to realize the detection of ambient temperature and humidity by the battery pack, thereby improving the accuracy of the battery management system in estimating the SOC of the battery module. The ambient temperature and humidity acquisition circuit includes a first temperature sensor and a humidity sensor, and the first temperature sensor and the humidity sensor are both arranged inside the box; the first temperature sensor adopts a Bluetooth temperature sensor, and the humidity sensor adopts a Bluetooth humidity sensor, so that the first temperature sensor and the humidity sensor can be wirelessly connected with the main control chip, so that the first temperature sensor and the humidity sensor can directly transmit the temperature and humidity data inside the box to the main control chip for analysis and utilization, and at the same time facilitate interactive feedback to the operator through an external data receiving interactive device, so as to effectively improve the response speed of the protection module to the temperature and humidity adjustment inside the box, as well as the information feedback efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of a battery pack with temperature and humidity detection functions in one embodiment. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] See also Figure 1 The present invention discloses a battery pack with temperature and humidity detection function, which includes a box body (not shown), a battery module 100 and a battery management system 200. The battery module 100 and the battery management system 200 are both arranged inside the box body, and the battery management system 200 is electrically connected to the battery module 100. The battery management system 200 includes a master control module 210, a slave control module 220 and a CAN bus communication circuit 230. The master control module 210 is communicatively connected to the CAN bus communication circuit 230; the slave control module 220 is communicatively connected to the CAN bus communication circuit 230, so that data can be transmitted between the master control module 210 and the slave control module 220 through the CAN bus communication circuit 230. The main control module 210 includes a main control chip 211 and an ambient temperature and humidity acquisition circuit 212. The main control chip 211 is communicatively connected to the CAN bus communication circuit 230. The acquisition end of the ambient temperature and humidity acquisition circuit 212 is arranged inside the box, and the output end of the ambient temperature and humidity acquisition circuit 212 is electrically connected to the input end of the main control chip 211. Thus, the ambient temperature and humidity acquisition circuit 212 can collect data on the ambient temperature and humidity inside the box, and then transmit it to the main control chip 211, so as to realize the battery pack's detection of ambient temperature and humidity, thereby improving the accuracy of the battery management system 200's SOC estimation of the battery module 100.

[0030] Specifically, the ambient temperature and humidity acquisition circuit 212 includes a first temperature sensor 2121 and a humidity sensor 2122, both of which are arranged inside the box; the first temperature sensor 2121 and the humidity sensor 2122 are respectively communicated with the main control chip 211, so that the first temperature sensor 2121 can collect the temperature inside the box, and the humidity sensor 2122 can collect the humidity inside the box, and then transmit the temperature data and the humidity data to the main control chip 211 respectively, so as to realize the temperature and humidity monitoring of the battery pack. In this embodiment, the first temperature sensor 2121 adopts a Bluetooth temperature sensor, and the humidity sensor 2122 adopts a Bluetooth humidity sensor, so that the first temperature sensor 2121 and the humidity sensor 2122 can be wirelessly connected to the main control chip 211. In this way, the first temperature sensor 2121 and the humidity sensor 2122 can directly transmit the temperature and humidity data inside the box to the main control chip 211 for analysis and utilization, and at the same time, it is convenient to interact and feedback to the operator through an external data receiving interactive device, thereby effectively improving the response speed of the protection module to the temperature and humidity adjustment inside the box, as well as the information feedback efficiency.

[0031] Furthermore, the ambient temperature and humidity acquisition circuit 212 also includes a temperature and humidity sensor 2123, which is arranged inside the box, and the output end of the temperature and humidity sensor 2123 is electrically connected to the input end of the main control chip 211, so that the temperature and humidity sensor 2123 can more accurately monitor the ambient temperature and humidity inside the box, and transmit the monitoring data to the main control chip 211 for analysis and utilization, so as to cooperate with the first temperature sensor 2121 and the humidity sensor 2122 to more accurately monitor the ambient temperature of the battery pack, so as to improve the estimation accuracy of the battery management system 200 for the SOC of the battery module 100. Specifically, the temperature and humidity sensor 2123 is set to SHT31, and is electrically connected to a pull-up resistor R1, so as to form an ambient temperature and humidity sensor 2123 circuit to stably transmit data signals to the main control chip 211.

[0032] Furthermore, the main control module 210 also includes a USB power circuit 213 , the output end of the USB power circuit 213 is electrically connected to the input end of the main control chip 211 , so that the USB power circuit 213 can supply power to the main control module 210 through the main control chip 211 .

[0033] Furthermore, the main control module 210 also includes a power decoupling circuit 214, which is arranged at the power end of the main control chip 211, so as to avoid the interference signal retained in each circuit during the use of the power supply from being coupled into the circuit through the USB power circuit 213, thereby reducing the pollution caused to the data and signal, and improving the accuracy of the battery management system 200 for data processing, signal collection and other tasks.

[0034] Furthermore, the main control module 210 also includes a clock circuit 215 and a reset circuit 216, and the clock circuit 215 and the reset circuit 216 are electrically connected to the main control chip 211 respectively; wherein, the clock circuit 215 can provide a time reference for the battery management system 200 as a reference for the system working sequence, so as to ensure that the battery management system 200 can perform various tasks stably and orderly; the reset circuit 216 can restore the battery management system 200 to the starting state and restart operation with one click when the operating state of the battery management system 200 does not meet the expected effect, thereby avoiding directly cutting off the power supply to achieve the purpose of re-powering on, thereby improving the safety and stability of the circuit, reducing the impact on the performance of the battery management system 200, and extending the service life of each component.

[0035] Furthermore, the main control module 210 also includes an alarm circuit 217, and the input end of the alarm circuit 217 is electrically connected to the output end of the main control chip 211. When the battery management system 200 has abnormal conditions such as overcharging, overdischarging, overcurrent, overtemperature, etc. during the charging and discharging process of the battery module 100, the main control chip 211 outputs a control signal to the alarm circuit 217 to start the alarm circuit 217 to send an alarm signal to the staff. In one embodiment, the alarm circuit 217 uses a buzzer PKLCS1212E2 and an LED lamp PC56H19-V1 to jointly complete the system alarm work.

[0036] Furthermore, the battery management system 200 also includes a USB serial communication circuit 240, one end of the USB serial communication circuit 240 is communicatively connected to the main control chip 211, and the other end of the USB serial communication circuit 240 is communicatively connected to an external host computer, thereby realizing the communication connection between the battery management system 200 and the external host computer.

[0037] Furthermore, the main control module 210 also includes a storage backup circuit 218, which is electrically connected to the main control chip 211. When the battery management system 200 estimates the SOC of the battery module 100, the data needs to be stored. When the storage capacity in the main control chip 211 is insufficient, the storage pressure of the main control chip 211 needs to be reduced through the storage backup circuit 218 to store the collected data and calculated data in the monitoring process, thereby solving the problem of insufficient storage space.

[0038] Furthermore, the slave control module 220 includes a slave control chip 221, a voltage acquisition circuit 222, a current acquisition circuit 223 and a temperature acquisition circuit 224. The slave control chip 221 is communicatively connected to the CAN bus communication circuit 230. The input end of the slave control chip 221 is electrically connected to the output end of the voltage acquisition circuit 222, the output end of the current acquisition circuit 223 and the output end of the temperature acquisition circuit 224, respectively. The input end of the voltage acquisition circuit 222, the input end of the voltage acquisition circuit 222 and the input end of the temperature acquisition circuit 224 are electrically connected to the battery module 100, respectively. Thus, the voltage acquisition circuit 222, the current acquisition circuit 223 and the temperature acquisition circuit 224 can acquire the voltage and current of the battery module 100 and the temperature of the single cells of the battery module 100, and then transmit the acquired data to the slave control chip 221 for calculation and analysis.

[0039] Furthermore, the temperature acquisition circuit 224 includes a second temperature sensor (not shown), which acquires the temperature of the single battery of the battery module 100. In one embodiment, the second temperature sensor adopts TMP117 and is electrically connected to a pull-up resistor R2, thereby forming a temperature acquisition circuit 224 to stably transmit data signals to the slave control chip 221.

[0040] In summary, the battery pack with temperature and humidity detection function disclosed in the present invention can collect data on the ambient temperature and humidity inside the box through the ambient temperature and humidity acquisition circuit, and then transmit it to the main control chip, so as to realize the detection of ambient temperature and humidity by the battery pack, thereby improving the accuracy of the battery management system in estimating the SOC of the battery module. The ambient temperature and humidity acquisition circuit includes a first temperature sensor and a humidity sensor, and the first temperature sensor and the humidity sensor are both arranged inside the box; the first temperature sensor adopts a Bluetooth temperature sensor, and the humidity sensor adopts a Bluetooth humidity sensor, so that the first temperature sensor and the humidity sensor can be wirelessly connected with the main control chip, so that the first temperature sensor and the humidity sensor can directly transmit the temperature and humidity data inside the box to the main control chip for analysis and utilization, and at the same time facilitate interactive feedback to the operator through an external data receiving interactive device, so as to effectively improve the response speed of the protection module to the temperature and humidity adjustment inside the box, as well as the information feedback efficiency.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pack with temperature and humidity detection function, characterized in that: include: A box body, a battery module and a battery management system, wherein the battery module and the battery management system are both arranged inside the box body, and the battery management system is electrically connected to the battery module, wherein the battery management system comprises a master control module, a slave control module and a CAN bus communication circuit, wherein the master control module is communicatively connected to the CAN bus communication circuit; and the slave control module is communicatively connected to the CAN bus communication circuit; The main control module includes a main control chip and an environmental temperature and humidity acquisition circuit, and the main control chip is communicatively connected to the CAN bus communication circuit; the acquisition end of the environmental temperature and humidity acquisition circuit is arranged inside the box, and the output end of the environmental temperature and humidity acquisition circuit is electrically connected to the input end of the main control chip; The environmental temperature and humidity acquisition circuit includes a first temperature sensor and a humidity sensor, both of which are arranged inside the box; the first temperature sensor and the humidity sensor are respectively connected to the main control chip for communication; The first temperature sensor adopts a Bluetooth temperature sensor, and the humidity sensor adopts a Bluetooth humidity sensor, so that the first temperature sensor and the humidity sensor can be wirelessly connected to the main control chip.

2. The battery pack with temperature and humidity detection function according to claim 1, characterized in that: The environmental temperature and humidity acquisition circuit also includes a temperature and humidity sensor, which is arranged inside the box, and the output end of the temperature and humidity sensor is electrically connected to the input end of the main control chip.

3. The battery pack with temperature and humidity detection function according to claim 2, characterized in that: The temperature and humidity sensor is set as SHT31 and is electrically connected to a pull-up resistor R1, thereby forming an environmental temperature and humidity sensor circuit to stably transmit data signals to the main control chip.

4. The battery pack with temperature and humidity detection function according to claim 3, characterized in that: The main control module also includes a USB power supply circuit, the output end of the USB power supply circuit is electrically connected to the input end of the main control chip, so that the USB power supply circuit can supply power to the main control module through the main control chip.

5. The battery pack with temperature and humidity detection function according to claim 4, characterized in that: The main control module also includes a power decoupling circuit, which is arranged at the power supply end of the main control chip.

6. The battery pack with temperature and humidity detection function according to claim 5, characterized in that: The main control module also includes a clock circuit and a reset circuit, which are electrically connected to the main control chip respectively; the clock circuit can provide a time reference for the battery management system as a reference for the system working sequence to ensure that the battery management system can perform various tasks stably and orderly; the reset circuit can restore the battery management system to the starting state and resume operation with one click when the operating state of the battery management system does not meet the expected results.

7. The battery pack with temperature and humidity detection function according to claim 6, characterized in that: The main control module also includes an alarm circuit, and an input end of the alarm circuit is electrically connected to an output end of the main control chip.

8. The battery pack with temperature and humidity detection function according to claim 7, characterized in that: The alarm circuit uses buzzer PKLCS1212E2 and LED light PC56H19-V1 as alarm units.

9. The battery pack with temperature and humidity detection function according to claim 8, characterized in that: The battery management system also includes a USB serial communication circuit, one end of the USB serial communication circuit is connected to the main control chip for communication, and the other end of the USB serial communication circuit is connected to the external host computer for communication, thereby realizing the communication connection between the battery management system and the external host computer.

10. The battery pack with temperature and humidity detection function according to claim 9, characterized in that: The main control module also includes a storage backup circuit, and the storage backup circuit is electrically connected to the main control chip.

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