CN210838009U

CN210838009U - Power battery protection plate with early warning function

Info

Publication number: CN210838009U
Application number: CN201921947333.XU
Authority: CN
Inventors: 彭贵
Original assignee: Shenzhen Yuhong Xinke Electronic Co ltd
Current assignee: Shenzhen Yuhong Xinke Electronic Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-06-23
Anticipated expiration: 2029-11-12

Abstract

The utility model relates to a power battery protection shield with early warning function, including single battery, single battery protection IC, the drive unit that charges, the drive unit that discharges, temperature detection circuit, safety precaution circuit and MCU of a plurality of series connection, single battery's positive terminal, negative pole end are connected with 1 foot of input, 2 feet electricity of single battery protection IC respectively, and 3 feet of output, 4 feet of single battery protection IC respectively with the drive unit that charges and discharge drive unit input electricity and connect, the drive unit that charges reaches discharge drive unit's output with the MCU electricity is connected, and temperature detection circuit inputs for MCU after amplifying battery surface temperature signal and handles, MCU still with safety precaution circuit electricity is connected. The utility model discloses can combine battery charge-discharge state and battery self temperature state real-time analysis battery performance state to send warning information to the user, improve battery operation security, avoid the battery spontaneous combustion explosion to arouse loss of property or even personal safety.

Description

Power battery protection plate with early warning function

Technical Field

The utility model relates to a battery safety control technical field especially relates to a power battery protection shield with early warning function.

Background

At present, the lithium iron phosphate battery has the characteristics of high capacity density and high safety and is widely applied to electric automobiles. Because electric automobile's security level is high, consequently require lithium iron phosphate battery to adapt to frequent charge-discharge to be provided with the battery protection shield that is used for managing lithium iron phosphate battery specially in the battery package, be used for carrying out real-time management and control to it, in order to guarantee battery safety in utilization.

The last temperature detecting element that simply is provided with of current battery protection shield does not combine battery charge-discharge actual conditions to carry out the integrated analysis, and the precision measurement reliability of the holistic health degree (SOH) of battery is not high, the utility model discloses to make the improvement here.

SUMMERY OF THE UTILITY MODEL

On the basis, it is necessary to provide a power battery panel with an early warning function aiming at the conditions that the existing battery protection board has low monitoring precision on the battery performance state and low reliability of early warning information, the battery performance state can be analyzed in real time by combining the battery charging and discharging state and the battery self temperature state, warning information is sent out to a user, the operation safety of the battery is improved, and the situation that the spontaneous combustion and explosion of the battery cause property loss or even personal safety is avoided.

A power battery protection board with an early warning function comprises a plurality of serially connected single batteries, a single battery protection IC, a charging drive unit, a discharging drive unit, a temperature detection circuit, a safety early warning circuit and an MCU (microprogrammed control Unit), wherein the positive end and the negative end of each single battery are respectively and electrically connected with an input 1 pin and an input 2 pin of the single battery protection IC, an output 3 pin and an output 4 pin of the single battery protection IC are respectively and electrically connected with the charging drive unit and an input end of the discharging drive unit, the output ends of the charging drive unit and the discharging drive unit are electrically connected with the MCU, the temperature detection circuit comprises an NTC, resistors R1-R4, a linear voltage stabilizer ZD and an operational amplifier U1 which are arranged on the surface of each single battery, the NTC is powered by the operational amplifier U1, and the other end of the NTC is grounded through the resistor R539, resistance R2 one end is connected NTC with resistance R1 intermediate node, the resistance R2 other end with operational amplifier U1's noninverting input electricity is connected, operational amplifier U1's inverting input termination ground connection behind the resistance R3, operational amplifier U1's output pass through resistance R4 connect the direction input with between the resistance R3, MCU with operational amplifier U1's output electricity is connected, MCU still with the safety precaution circuit electricity is connected.

Preferably, the safety precaution circuit includes MOS transistor Q1, buzzer U2, resistance R5, MOS transistor Q1's base with the MCU electricity is connected, MOS transistor Q1's drain-source resistance passes through resistance R5 is connected with linear voltage regulator ZD electrically, MOS transistor Q1's source passes through buzzer U2 ground connection.

Preferably, the MOS transistor Q1 is N-channel.

Preferably, the type of the single battery protection IC is CS 213.

Preferably, the intelligent card also comprises a wireless communication module, and the wireless communication module is electrically connected with the MCU 7.

The utility model discloses an useful part lies in: 1. the single battery protection IC is connected in parallel on the single battery, so that the charging and discharging conditions of each single battery can be monitored in real time, the overcharge and overdischarge of the battery are avoided, and the output end of the single battery protection IC is connected with a driving unit for driving overcharge and overdischarge information to realize the overcharge and overdischarge protection of the battery; 2. still integrated temperature detection and early warning circuit on the guard plate, temperature detection and battery cell protection IC simultaneous working carry out duplicate protection to the battery cell operation, have improved the reliability of system, stability.

Drawings

Fig. 1 is a schematic diagram of a circuit structure of a power battery protection board with an early warning function according to an embodiment of the invention.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, 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 belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a power battery protection board with an early warning function includes a plurality of serially connected single batteries 1, a single battery protection IC2, a charging driving unit 3, a discharging driving unit 4, a temperature detecting circuit 5, a safety early warning circuit 6 and an MCU7, wherein a positive terminal and a negative terminal of each single battery 1 are electrically connected with an input pin 1 and a pin 2 of a single battery protection IC2, an output pin 3 and a pin 4 of the single battery protection IC2 are electrically connected with the charging driving unit 3 and an input terminal of the discharging driving unit 4, output terminals of the charging driving unit 3 and the discharging driving unit 4 are electrically connected with the MCU7, the temperature detecting circuit 5 includes an NTC installed on a surface of the single battery, resistors R1 to R4, a linear regulator ZD and an operational amplifier U1, the linear regulator ZD supplies power to the NTC and the operational amplifier U1, the NTC other end passes through resistance R1 ground connection, resistance R2 one end is connected the NTC with resistance R1 intermediate node, the resistance R2 other end with operational amplifier U1's noninverting input end is connected, operational amplifier U1's inverting input termination ground connection behind the resistance R3, operational amplifier U1's output pass through resistance R4 connect the direction input with between the resistance R3, MCU7 with operational amplifier U1's output electricity is connected, MCU7 still with safety precaution circuit 6 electricity is connected. Specifically, in the present embodiment, a cell protection IC2, specifically, the type of the IC is CS213, is connected in parallel to each cell 1 connected in series. Since the pins 1 of the cell protection IC2 are connected to the positive terminals of the cells 1, the pins 1 are all at a high level and the pins 2 are at a low level. When the single battery is over-discharged, the voltages at the two ends can be slowly reduced, the single battery protection IC2 detects the voltages at the two ends of the single battery 1 in real time through a resistor arranged in the single battery protection IC2, when the voltage at the two ends of the single battery 1 is reduced to 2.3V, the single battery protection IC2 judges that the single battery protection IC is in an over-discharge state, judgment information is output to the discharge driving unit 4 through 4 pins, the MCU7 is driven by the discharge driving unit 4 to control the disconnection of the switching device, the single battery 1 is further protected, and the service life of the single battery is prevented from being influenced. The overcharge protection of the unit cell 1 is similar and will not be described herein. In addition, in the embodiment, a temperature detection circuit 5 is further provided, an NTC (negative temperature coefficient thermistor) in the temperature detection circuit 5 is installed on the surface of the single battery 1 to detect the surface temperature of the single battery in real time, when the surface temperature of the single battery 1 rises, the resistance value of the NTC decreases, the voltage of the resistor R1 rises, the operational amplifier U1 amplifies the voltage of the resistor R1 and transmits the amplified voltage to the MCU7, the amplified voltage is compared inside the MCU7 and then is sent to the subsequent safety early warning circuit 6, and an early warning is given to a user to remind the user. The linear voltage stabilizer ZD provides a 5V stable power supply, but not the single battery 1, so that the detection precision of the temperature detection circuit 5 is effectively prevented from being influenced by the single battery in the charging and discharging process.

As shown in fig. 1, the safety precaution circuit 6 includes a MOS transistor Q1, a buzzer U2, and a resistor R5, a base of the MOS transistor Q1 is electrically connected to the MCU7, a drain of the MOS transistor Q1 is electrically connected to the linear regulator ZD through the resistor R5, and a source of the MOS transistor Q1 is grounded through the buzzer U2. Specifically, MOS pipe Q1 is the N channel, and under normal conditions, MOS pipe Q1 is in the off-state, and when temperature detection circuit 5 detected that battery cell 1 temperature exceeded the critical value, MCU7 gave a control signal to MOS pipe Q1 base, and MOS pipe Q1 switches on, and buzzer U2 reports to the police, suggestion battery cell 1 gets into dangerous condition.

As shown in fig. 1, the wireless communication device further includes a wireless communication module 8, and the wireless communication module 8 is electrically connected to the MCU 7. Specifically, still be provided with wireless communication module 8 on the protective plate, wireless communication module 8 can be the WIFI module, 3G communication module etc for send the early warning information that MCU7 received to cloud ware and user's end, make things convenient for after-sales maintenance person to carry out after-sales analysis and maintenance according to the real-time detection information that MCU7 uploaded.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a power battery protection shield with early warning function which characterized in that: the safety early warning device comprises a plurality of single batteries, a single battery protection IC, a charging drive unit, a discharging drive unit, a temperature detection circuit, a safety early warning circuit and an MCU (microprogrammed control Unit), wherein the single batteries are connected in series, the positive ends and the negative ends of the single batteries are respectively and electrically connected with an input pin 1 and a pin 2 of the single battery protection IC, an output pin 3 and a pin 4 of the single battery protection IC are respectively and electrically connected with the charging drive unit and an input end of the discharging drive unit, the output ends of the charging drive unit and the discharging drive unit are electrically connected with the MCU, the temperature detection circuit comprises an NTC (negative temperature coefficient) arranged on the surface of the single batteries, resistors R1-R4, a linear voltage stabilizer ZD and an operational amplifier U1, the linear voltage stabilizer ZD supplies power to the NTC and the operational amplifier U1, the other end of the NTC is grounded through the resistor R39, the other end of the resistor R2 is electrically connected with the non-inverting input end of the operational amplifier U1, the inverting input end of the operational amplifier U1 is connected with the resistor R3 and then grounded, the output end of the operational amplifier U1 is connected between the directional input end and the resistor R3 through a resistor R4, the MCU is electrically connected with the output end of the operational amplifier U1, and the MCU is further electrically connected with the safety early warning circuit.

2. The power battery protection board with the early warning function as claimed in claim 1, wherein: the safety early warning circuit comprises an MOS tube Q1, a buzzer U2 and a resistor R5, the base electrode of the MOS tube Q1 is electrically connected with the MCU, the drain electrode of the MOS tube Q1 is connected with the linear voltage stabilizer ZD through a resistor R5, and the source electrode of the MOS tube Q1 is grounded through the buzzer U2.

3. The power battery protection board with the early warning function as claimed in claim 2, wherein: the MOS transistor Q1 is N-channel.

4. The power battery protection board with the early warning function as claimed in claim 1, wherein: the type of the single battery protection IC is CS 213.

5. The power battery protection board with the early warning function as claimed in claim 1, wherein: the wireless communication module is electrically connected with the MCU 7.