Electric battery leakage detection system
Technical field
The present invention relates to a kind of electric battery detection system, especially a kind of electric battery leakage detection system.
Background technology
Polymer flexible packaging lithium ion battery has the advantages such as voltage is high, specific energy is high, recycle often, storage time is long, after using several battery cell connection in series-parallel formation battery modules, can be widely used in the big-and-middle-sized electrical equipment aspects such as electric automobile, electric bicycle and electric tool.
In prior art, battery module is contained in battery case, owing to need to taking into account heat-sinking capability and the stability of battery case, generally adopts metal battery case as the container that holds battery module; Lithium ion battery is because the defect self existing or mount fixing structure is unreasonable, after the use through after a while, the inefficacy that may have leakage occurs, the electrolytic solution spilling is a kind of conduction organic material, electrolyte leakage on battery tank wall time, by electric battery and battery case conducting, causes battery case charged, the high-tension electricity of electric battery causes danger may to passenger and electron device in electric automobile, causes potential safety hazard.
Summary of the invention
The object of this invention is to provide a kind of system that detects electric battery leakage.
For reaching above-mentioned purpose, the invention provides a kind of electric battery leakage detection system, it comprises electric battery, accommodates metal battery case processed, input power, load and the voltage check device of electric battery, electric battery, input power, load and battery case shell are connected in series, and described voltage check device is parallel to metal battery case or load.
Electric battery, input power, load and battery case shell are connected in series, if electric battery is working properly leakage do not occur, and this circuit is considered as opening circuit, and does not have or very little voltage can only be detected; If electric battery operation irregularity generation leakage, the magnitude of voltage that voltage check device detects is higher, for input supply voltage adds the battery cell of leakage and the pressure reduction of maximum potential.
The input power of connecting in series circuit, is convenient to calculate the present position of battery cell of electric battery internal leakage, and the magnitude of voltage that voltage check device detects is that input supply voltage adds the battery cell of leakage and the pressure reduction of maximum potential.
As preferably, described voltage check device is parallel to load.
Load reduces the impact of input power on electric battery, voltage check device is parallel to the voltage that load records voltage check device more accurate.
As preferably, described load comprises resistance.
Use resistance as load, assembling is simple, and reliability is high.
As preferably, described resistance comprises that resistance is the resistance of 50k Ω to 300k Ω.
Selecting resistance is the resistance of 50k Ω to 300k Ω, can reduce the impact of input power on electric battery, has also guaranteed the accuracy of voltage check device reading simultaneously.
As preferably, described resistance comprises that resistance is the resistance of 100k Ω.
Selecting resistance is the resistance of 100k Ω, can further reduce the impact of input power on electric battery.
As preferably, on described series circuit, the positive terminal of input power arranges unilateral diode.
On series circuit, the positive terminal of input power arranges unilateral diode, can prevent the impact of the high voltage of electric battery on input power, prevents that input power from being burnt out by the inverse current of electric battery.
As preferably, on described series circuit, detector switch is set.
Because leakage situation is a generating process, can not occur suddenly, so detect the words of leakage, do not need to detect very frequently, every a period of time, detect just passable; When needs detect, with regard to occlusion detection switch (anode can be connected to casing by input power during detection), when not needing to detect, just do not disconnect, guarantee the disconnection completely of battery and casing.
After adopting technical scheme provided by the invention, can when electric battery generation leakage, detect, and can calculate exactly the battery unit that leakage occurs by simple calculating, more be convenient to change battery unit; System, based on the design of primary element group, can increase electric battery leakage detection system in the situation that not changing primary element group structure, is convenient to promote the use of, and simple to operate, result is accurate.
Accompanying drawing explanation
Fig. 1 is electric battery leakage detection system electrical schematics.
Wherein, 1, battery case, 11, electric battery, 2, input power, 3, load, 4, voltage check device, 5, unilateral diode, 6, detector switch.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
Embodiment 1
As shown in Figure 1, electric battery leakage detection system provided by the invention, it comprises metal battery case 1 processed, electric battery 11, input power 2, load 3, voltage check device 4, unilateral diode 5 and detector switch 6, first electric battery 11, battery case 1, input power 2, load 3, voltage check device 4 and unilateral diode 5 are cascaded, it is the resistance of 50k Ω that resistance is selected in load 3; Occlusion detection switch 6, when electric battery 11 is working properly while there is not leakage, this circuit is considered as opening circuit, and voltage check device 4 does not have reading or very little voltage can only be detected; If electric battery 11 operation irregularity generation leakages, the reading that voltage check device 4 detects shows that magnitude of voltage is higher, and now showing has battery unit that leakage has occurred in electric battery 11, defective insulation.
Embodiment 2
As shown in Figure 1, electric battery leakage detection system provided by the invention, it comprises metal battery case 1 processed, electric battery 11, input power 2, load 3, voltage check device 4 unilateral diodes 5 and detector switch 6, first electric battery 11, battery case 1, input power 2, load 3, voltage check device 4 and unilateral diode 5 are cascaded, it is the resistance of 100k Ω that resistance is selected in load 3; Occlusion detection switch 6, when electric battery 11 is working properly while there is not leakage, this circuit is considered as opening circuit, and voltage check device 4 does not have reading or very little voltage can only be detected; If electric battery 11 operation irregularity generation leakages, the reading that voltage check device 4 detects shows that magnitude of voltage is higher, and now showing has battery unit that leakage has occurred in electric battery 11, defective insulation.
Embodiment 3
As shown in Figure 1, electric battery leakage detection system provided by the invention, it comprises metal battery case 1 processed, electric battery 11, input power 2, load 3, voltage check device 4 unilateral diodes 5 and detector switch 6, first electric battery 11, battery case 1, input power 2, load 3, voltage check device 4 and unilateral diode 5 are cascaded, it is the resistance of 300k Ω that resistance is selected in load 3; Occlusion detection switch 6, when electric battery 11 is working properly while there is not leakage, this circuit is considered as opening circuit, and voltage check device 4 does not have reading or very little voltage can only be detected; If electric battery 11 operation irregularity generation leakages, the reading that voltage check device 4 detects shows that magnitude of voltage is higher, and now showing has battery unit that leakage has occurred in electric battery 11, defective insulation.