CN209460318U - A kind of voltage collection circuit for preventing thermal runaway and having both temperature detection - Google Patents

Abstract

The utility model discloses a kind of voltage collection circuits for preventing thermal runaway and having both temperature detection, belong to electric vehicle engineering field, the A/D acquisition control circuit including analog signal to be switched to digital signal；It is connect it is characterized by: the anode of storage power passes through warm power transformation resistance with the electrode input end mouth of A/D acquisition control circuit, the cathode of storage power is connect with the negative input mouth of A/D acquisition control circuit；It further include the enhanced field-effect tube of N ditch for controlling A/D acquisition control circuit working condition, the anode of above-mentioned storage power passes sequentially through the source electrode connection of warm power transformation resistance, first resistor and the enhanced field-effect tube of N ditch；The cathode of above-mentioned storage power is connect with the drain electrode of the enhanced field-effect tube of N ditch；The grid of the above-mentioned enhanced field-effect tube of N ditch is connect with the enable port of A/D acquisition control circuit；The anode of above-mentioned storage power passes sequentially through the cathode connection of warm power transformation resistance, second resistance and storage power.

Description

A kind of voltage collection circuit for preventing thermal runaway and having both temperature detection

Technical field

The utility model belongs to electric vehicle engineering field more particularly to a kind of prevent thermal runaway and have both temperature detection Voltage collection circuit.

Background technique

With worldwide energy crisis and climate warming, new-energy automobile is more and more welcomed by the people, draws The extensive concern of traffic and transport field is played.Application start of the relevant industries all to power battery in this field in world wide Extensive research.It is well known that electric car (BEV) refers to using vehicle power supply as power, with motor driven wheels travel, meet The vehicle of road traffic, security legislation requirements.With the development of electric vehicle engineering, to the battery in electric powered motor source And battery management system monitoring and safety requirements it is also higher and higher.Current battery management system (hereinafter referred to as BMS) is to electricity The acquisition of pond group voltage signal directly acquires battery core monomer voltage generally by sub-controller.Sample circuit exists in order to prevent Acquisition system is damaged under short circuit or overcurrent situations, fuse can be placed in sampling circuit front end, when sampling circuit electricity When stream goes beyond the scope, insurance be will disconnect, and achieve the purpose that protect acquisition system.Be illustrated in fig. 1 shown below: the prior art uses fuse The shortcomings that series connection access electric signal sampling circuit, the purpose of Lai Shixian overcurrent protection, current methods:

1) fuse is not easy to weld in the line, is also easy to overheat fusing damage in assembly welding process.

2) maintainability is poor, is unable to self- recoverage, needs the system of dismantling after insurance burn-up, replace the insurance damaged.

Utility model content

In view of the drawbacks of the prior art, the utility model provides a kind of voltage for preventing thermal runaway and having both temperature detection and adopts Collector, this prevents thermal runaway and has both the voltage collection circuit of temperature detection using a kind of temperature variable resistance resistant to device, and series winding accesses In sampling circuit, when sampling circuit electric current becomes larger or when environment temperature has rising, warm variable resistance resistant to device makes because power becomes larger Temperature increases, and impedance also increases with it, the purpose for inhibiting sampling circuit electric current to increase.Whole system is protected not send out to reach The purpose of raw overcurrent, short circuit and thermal runaway.

Used by the utility model the specific technical proposal is:

The goal of the invention of this patent is to provide a kind of voltage collection circuit for preventing thermal runaway and having both temperature detection, including Analog signal is switched to the A/D acquisition control circuit of digital signal；The anode of storage power passes through warm power transformation resistance and controls with A/D acquisition The electrode input end mouth of circuit processed connects, and the cathode of storage power is connect with the negative input mouth of A/D acquisition control circuit；Also The enhanced field-effect tube of N ditch including controlling A/D acquisition control circuit working condition, the anode of above-mentioned storage power pass sequentially through The source electrode of warm power transformation resistance, first resistor and the enhanced field-effect tube of N ditch connects；The cathode of above-mentioned storage power and N ditch are enhanced The drain electrode of field-effect tube connects；The grid of the above-mentioned enhanced field-effect tube of N ditch and the enable port of A/D acquisition control circuit connect It connects；The anode of above-mentioned storage power passes sequentially through the cathode connection of warm power transformation resistance, second resistance and storage power.

The advantages of the utility model and good effect are as follows:

By using above-mentioned technical proposal, the utility model is had the following technical effect that:

This prevents from thermal runaway and has both the voltage collection circuit of temperature detection using a kind of temperature variable resistance resistant to device (Wen Bian electricity Resistance), series winding access sampling circuit in, when sampling circuit electric current becomes larger or when environment temperature has rising, warm variable resistance resistant to device because Power becomes larger and elevates the temperature, and impedance also increases with it, the purpose for inhibiting sampling circuit electric current to increase.To reach protection The purpose of overcurrent, short circuit and thermal runaway does not occur for whole system.

Warm variable resistance resistant to device in the utility model has restorability, will not be as insurance after realizing defencive function It is just damaged, needs replacing.

The utility model circuit implements simple, convenient, it can be achieved that thermal runaway protection, temperature detection and circuit diagnostics function Energy；Hardware cost can be greatly reduced and promote defencive function.

The utility model does not need additional temperature sensing circuit, and the temperature detection and circuit that acquisition circuit can be realized are examined It is disconnected.

Detailed description of the invention

Fig. 1 is the circuit diagram of traditional technology

Fig. 2 is the circuit diagram of utility model preferred embodiment；

Specific embodiment

For the invention, features and effects that can further appreciate that the utility model, the following examples are hereby given, and cooperates Detailed description are as follows for attached drawing.

The structure of the utility model is explained in detail with reference to the accompanying drawing.

Please refer to Fig. 2: a kind of voltage collection circuit for preventing thermal runaway and having both temperature detection, including analog signal is turned For the A/D acquisition control circuit of digital signal；The anode of storage power passes through the anode of warm power transformation resistance and A/D acquisition control circuit Input port connection, the cathode of storage power are connect with the negative input mouth of A/D acquisition control circuit；It further include control A/D The enhanced field-effect tube of N ditch of acquisition control circuit working condition, the anode of above-mentioned storage power pass sequentially through warm power transformation resistance, the One resistance is connect with the source electrode of the enhanced field-effect tube of N ditch；The cathode of above-mentioned storage power and the leakage of the enhanced field-effect tube of N ditch Pole connection；The grid of the above-mentioned enhanced field-effect tube of N ditch is connect with the enable port of A/D acquisition control circuit；Above-mentioned electric power storage electricity The anode in source passes sequentially through the cathode connection of warm power transformation resistance, second resistance and storage power.

The working principle of above preferred embodiment are as follows:

RT is a kind of resistance value of temperature variable resistance resistant to device, and in the above-described embodiments, warm variable resistance resistant to device is specially warm power transformation resistance, It is increased and raised characteristic with impedance with temperature；RD and RB is the resistance value of constant resistance, RD second clear in order to describe The resistance value of resistance, RB are the resistance value of first resistor；K is switching circuit；K is using the enhanced field-effect tube of N ditch.A/D acquisition Control circuit can realize the acquisition of voltage signal and the on-off control of switch K.

In this embodiment, using warm variable resistance resistant to device, series winding is accessed in sampling circuit, when sampling circuit electric current becomes larger When or environment temperature when having rising, warm variable resistance resistant to device elevates the temperature because power becomes larger, and impedance also increases with it, suppression The purpose that sampling circuit electric current processed increases.To achieve the purpose that protect whole system that overcurrent, short circuit and thermal runaway do not occur.

On the basis of realizing the above thermal runaway defencive function, by circuit control and algorithm, (algorithm can be engineering Teacher obtained by the sampled result artificial technology of A/D acquisition control circuit, can also be soft with the computer of sampling technique comparative maturity Part carries out calculating realization) realize temperature detection and circuit state diagnosis.The specific method is as follows:

It is assumed that currently collected cell voltage is V, the resistance value of warm impedance RT is unknown, Current Temperatures T, A/D acquisition control Circuit input impedance processed is very negligible greatly not to be included in calculating.

1) it is disconnected by A/D acquisition control circuit control switch circuit K, while recording A/D voltage signal values at this time, if A/D voltage signal values are V1 when K is disconnected；V1=V*RD/ (RT+RD)；

2) it is connected by A/D acquisition control circuit control switch circuit K, while recording A/D voltage signal values at this time, if A/D voltage signal values are V2 when K is connected；V2=V* (RD//RB)/(RT+ (RD//RB))；

3) it is based on two above formula, the current resistance value of collected cell voltage V and warm impedance device R T can be calculated.

4) according to RT current resistance value and the temperature of RT/impedance conversion relation, worked as by the available acquisition circuit of look-up table Preceding temperature T.

5) when the RT and Current Temperatures T being calculated exceed normality threshold range, circuit system failure can be diagnosed as.

By the above circuit design and method, the voltage monitoring and route thermal runaway of battery pack are realized using inexpensive circuit Protection.On the basis of realizing the above thermal runaway defencive function, temperature detection and circuit can be realized by circuit control and algorithm Condition diagnosing.

1. protecting voltage sample circuit that the method for overcurrent, short circuit and thermal runaway does not occur by warm variable resistance resistant to device.

2. realizing temperature detection and circuit state diagnosis in voltage sample circuit by circuit control and algorithm.

The above is only the preferred embodiment to the utility model, is not made in any form to the utility model Limitation, it is all according to the technical essence of the utility model any simple modification made to the above embodiment, equivalent variations with Modification, is all within the scope of the technical scheme of the utility model.

Claims (1)

1. a kind of voltage collection circuit for preventing thermal runaway and having both temperature detection, including analog signal is switched to digital signal A/D acquisition control circuit；It is characterized by: the anode of storage power passes through the anode of warm power transformation resistance and A/D acquisition control circuit Input port connection, the cathode of storage power are connect with the negative input mouth of A/D acquisition control circuit；It further include control A/D The enhanced field-effect tube of N ditch of acquisition control circuit working condition, the anode of above-mentioned storage power pass sequentially through warm power transformation resistance, the One resistance is connect with the source electrode of the enhanced field-effect tube of N ditch；The cathode of above-mentioned storage power and the leakage of the enhanced field-effect tube of N ditch Pole connection；The grid of the above-mentioned enhanced field-effect tube of N ditch is connect with the enable port of A/D acquisition control circuit；Above-mentioned electric power storage electricity The anode in source passes sequentially through the cathode connection of warm power transformation resistance, second resistance and storage power.