CN105490327A - Three-layer protection system for lithium battery pack and control method of three-layer protection system - Google Patents
Three-layer protection system for lithium battery pack and control method of three-layer protection system Download PDFInfo
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- CN105490327A CN105490327A CN201510759052.1A CN201510759052A CN105490327A CN 105490327 A CN105490327 A CN 105490327A CN 201510759052 A CN201510759052 A CN 201510759052A CN 105490327 A CN105490327 A CN 105490327A
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Abstract
The invention discloses a three-layer protection system for a lithium battery pack and a control method of the three-layer protection system. The system comprises a battery management control module, a single battery voltage collection interface, a first controller, a second controller, a switch module, a three-terminal fuse wire, an electrolyte gas sensor and an alarm module, wherein the three-terminal fuse wire, the lithium battery pack, the switch module and a load are connected in series to form a loop; single batteries in the lithium battery pack are electrically connected with the battery management control module through the single battery voltage collection interface; the first controller is electrically connected with the battery management control module and the alarm module respectively; the second controller is electrically connected with a control terminal of the three-terminal fuse wire and the electrolyte gas sensor respectively; and the control terminal of the switch module is electrically connected with the battery management control module, the first controller and the second controller. The lithium battery pack is protected through three-layer protection measures; the protection is timely and effective; and the misjudgment condition is reduced.
Description
Technical field
The present invention relates to technical field of lithium batteries, particularly relate to a kind of lithium battery group three-layer protection system and control method thereof.
Background technology
Because non-renewable energy resources crisis and environmental pollution are serious, the whole world accelerates the development of environmental protection high-performance lithium battery, and the application of lithium battery extends to the fields such as traffic power, energy storage, space flight, communication spare power supplies by digital product field.Lithium battery from low-voltage, small area analysis to high voltage, the application such as high-power development.System administration request for lithium battery is also just continuous in raising, requires the administration battery pack module that battery management system can be stable under the condition of high-power use lithium battery, makes it controlled and the security incidents such as on fire can not occur.
The protection system adopted in lithium battery group at present mainly exports control signal by a power management IC collection battery cell voltage; single voltage signal is relied on likely to make protection system control to start a leak; electrolyte that such as lithium battery group super-charge super-discharge causes is revealed, cannot the signal such as output protection warning.
Summary of the invention
The object of the invention is to overcome existing lithium battery group protection system and rely on single voltage signal protection lithium battery group; the easy technical problem occurring protecting not in time or judge by accident; provide a kind of lithium battery group three-layer protection system and control method thereof; it is by three-layer protection measure protection lithium battery group; protect timely and effective, reduce the generation of erroneous judgement situation.
In order to solve the problem, the present invention is achieved by the following technical solutions:
A kind of lithium battery group three-layer protection system of the present invention, comprise battery management control modules, monomer battery voltage acquisition interface, first controller, second controller, switch module, three end fuses, electrolyte gas sensor and alarm module, described three end fuses, lithium battery group, switch module becomes a loop with load in series, cell in described lithium battery group is electrically connected with battery management control modules by monomer battery voltage acquisition interface, described first controller is electrically connected with battery management control modules and alarm module respectively, described second controller is electrically connected with the control end of three end fuses and electrolyte gas sensor respectively, the control end of described switch module and battery management control modules, first controller and second controller electrical connection.
In the technical program, battery management control modules gathers the voltage of each cell, and these voltage datas are sent to the first controller, and second controller detects in lithium battery group whether have lithium battery electrolytes volatilization gas by electrolyte gas sensor.
Be greater than higher limit K1 when there being the voltage of more than 1 or 1 cell or lower than lower limit K2 time, battery management control modules control switch module disconnect, lithium battery group stop discharge and recharge, prevent lithium battery group from overcharging or cross put; Be greater than higher limit K3 when there being the voltage of more than 1 or 1 cell or lower than lower limit K4 time, K3 > K1, K4 < K2, the first controller control switch module disconnects, lithium battery group stops discharge and recharge, controls alarm module simultaneously and sends warning; When electrolyte gas sensor detects lithium battery electrolytes volatilization gas, second controller control switch module disconnects, output current is to the control end of three end fuses simultaneously, makes three end blown fuses, and the electrolyte preventing lithium battery group from causing because of super-charge super-discharge is revealed.If discharge and recharge MOS shielding failure, because second controller output current is forced to burn out three end fuses, stop battery last to input or output, can prevent from lithium battery group from crossing putting waiting initiation security incident.
As preferably, described a kind of lithium battery group three-layer protection system also comprises the temperature sensor for detecting lithium battery group temperature, and described temperature sensor is electrically connected with second controller.When the temperature value that temperature sensor detects exceedes set point, second controller control switch module disconnects, and output current is to the control end of three end fuses simultaneously, and make three end blown fuses, the temperature preventing lithium battery group from causing because of super-charge super-discharge is too high.
As preferably, described a kind of lithium battery group three-layer protection system also comprises the pressure sensor be arranged in lithium battery group between cell and battery case, and described pressure sensor is electrically connected with second controller.When the force value that pressure sensor detects exceedes set point, second controller control switch module disconnects, output current is to the control end of three end fuses simultaneously, makes three end blown fuses, prevents the flatulence expansion bulge that lithium battery group causes because of super-charge super-discharge.
As preferably, described alarm module comprises indicator light and buzzer, and described indicator light and buzzer are electrically connected with the first controller respectively.
As preferably, described switch module comprises a N-MOS pipe and the 2nd N-MOS manages, the positive pole of described lithium battery group is electrically connected with load positive pole by three end fuses, negative pole one end of described lithium battery group is electrically connected with the S pole of a N-MOS pipe, the D pole of the one N-MOS pipe is electrically connected with the D pole of the 2nd N-MOS pipe, the S pole of the 2nd N-MOS pipe is connected with load negative electricity, described battery management control modules is electrically connected with the G pole of a N-MOS pipe and the G pole of the 2nd N-MOS pipe respectively, described first controller is electrically connected with the G pole of a N-MOS pipe and the G pole of the 2nd N-MOS pipe respectively, described second controller is electrically connected with the G pole of a N-MOS pipe and the G pole of the 2nd N-MOS pipe respectively.When the overcharge of lithium battery group, control the 2nd N-MOS pipe and disconnect; When the overdischarge of lithium battery group, control a N-MOS pipe and disconnect.
The control method of a kind of lithium battery group three-layer protection system of the present invention, comprises the following steps:
S1: battery management control modules gathers the voltage of each cell, and these voltage datas are sent to the first controller, second controller detects in lithium battery group whether have lithium battery electrolytes volatilization gas by electrolyte gas sensor, detected the temperature of lithium battery group by temperature sensor, detect the pressure in lithium battery group between cell and battery case by pressure sensor;
S2: when the voltage of at least one cell be greater than higher limit K1 or lower than lower limit K2 time, battery management control modules control switch module disconnects, and lithium battery group stops discharge and recharge; When the voltage of at least one cell be greater than higher limit K3 or lower than lower limit K4 time, K3 > K1, K4 < K2, the first controller control switch module disconnects, lithium battery group stops discharge and recharge, controls alarm module simultaneously and sends warning; When electrolyte gas sensor detect temperature value that lithium battery electrolytes volatilization gas or temperature sensor detect exceed force value that set point or pressure sensor detect exceed set point time, second controller control switch module disconnects, output current is to the control end of three end fuses simultaneously, makes three end blown fuses.
Substantial effect of the present invention is: by three-layer protection measure protection lithium battery group; if discharge and recharge MOS shielding failure; lithium battery group can cause that lithium battery group electrolyte is revealed, the too high or flatulence bulge of temperature by super-charge super-discharge; now the second control module output current is forced to burn out three end fuses; can prevent from lithium battery group from crossing putting etc. causing security incident; protect timely and effective, reduce the generation of erroneous judgement situation.
Accompanying drawing explanation
Fig. 1 is that a kind of circuit theory of the present invention connects block diagram.
In figure: 1, battery management control modules, 2, monomer battery voltage acquisition interface, the 3, first controller, 4, second controller, 5, switch module, 6, three end fuses, 7, electrolyte gas sensor, 8, temperature sensor, 9, pressure sensor, 10, indicator light, 11, buzzer, the 12, the one N-MOS pipe, the 13, the 2nd N-MOS pipe, 14, load, 15, lithium battery group.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: a kind of lithium battery group three-layer protection system of the present embodiment, as shown in Figure 1, comprises battery management control modules 1, monomer battery voltage acquisition interface 2, first controller 3, second controller 4, switch module 5, three end fuses 6, electrolyte gas sensor 7, alarm module, for the temperature sensor 8 that detects lithium battery group temperature and the pressure sensor 9 be arranged in lithium battery group 15 between cell and battery case, alarm module comprises indicator light 10 and buzzer 11, three end fuse 6, lithium battery group 15, switch module 5 and load 14 are connected into a loop, and the cell in lithium battery group 15 is electrically connected with battery management control modules 1 by monomer battery voltage acquisition interface 2, the first controller 3 respectively with battery management control modules 1, indicator light 10 and buzzer 11 are electrically connected, second controller 4 respectively with the control end of three end fuses 6, electrolyte gas sensor 7, temperature sensor 8 and pressure sensor 9 are electrically connected, the control end of switch module 5 and battery management control modules 1, first controller 3 and second controller 4 are electrically connected.
Battery management control modules gathers the voltage of each cell, and these voltage datas are sent to the first controller; Second controller detects in lithium battery group whether have lithium battery electrolytes volatilization gas by electrolyte gas sensor, detected the temperature of lithium battery group by temperature sensor, detect the pressure in lithium battery group between cell and battery case by pressure sensor.
Be greater than higher limit K1 when there being the voltage of more than 1 or 1 cell or lower than lower limit K2 time, battery management control modules control switch module disconnect, lithium battery group stop discharge and recharge, prevent lithium battery group from overcharging or cross put; Be greater than higher limit K3 when there being the voltage of more than 1 or 1 cell or lower than lower limit K4 time, K3 > K1, K4 < K2, first controller control switch module disconnects, lithium battery group stop discharge and recharge, simultaneously control indicator light light, buzzer call report to the police; When electrolyte gas sensor detect temperature value that lithium battery electrolytes volatilization gas or temperature sensor detect exceed force value that set point or pressure sensor detect exceed set point time, second controller control switch module disconnects, output current is to the control end of three end fuses simultaneously, make three end blown fuses, the electrolyte preventing lithium battery group from causing because of super-charge super-discharge is revealed, temperature is too high or flatulence expansion bulge.If discharge and recharge MOS shielding failure, because second controller output current is forced to burn out three end fuses, stop battery last to input or output, can prevent from lithium battery group from crossing putting waiting initiation security incident.Lithium battery group three-layer protection system also comprises wireless communication module, and wireless communication module is electrically connected with second controller.When electrolyte gas sensor detect temperature value that lithium battery electrolytes volatilization gas or temperature sensor detect exceed force value that set point or pressure sensor detect exceed set point time, second controller sends warning message by wireless communication module to user mobile phone.
Switch module comprises a N-MOS pipe 12 and the 2nd N-MOS pipe 13, the positive pole of lithium battery group 15 is electrically connected with load 14 positive pole by three end fuses 6, negative pole one end of lithium battery group 15 is electrically connected with the S pole of a N-MOS pipe 12, the D pole of the one N-MOS pipe 12 is electrically connected with the D pole of the 2nd N-MOS pipe 13, the S pole of the 2nd N-MOS pipe 13 is connected with load 14 negative electricity, battery management control modules 1 is electrically connected with the G pole of a N-MOS pipe 12 and the G pole of the 2nd N-MOS pipe 13 respectively, first controller 3 is electrically connected with the G pole of a N-MOS pipe 12 and the G pole of the 2nd N-MOS pipe 13 respectively, second controller 4 is electrically connected with the G pole of a N-MOS pipe 12 and the G pole of the 2nd N-MOS pipe 13 respectively.When 15 overcharge of lithium battery group, control the 2nd N-MOS pipe 13 and disconnect; When 15 overdischarge of lithium battery group, control a N-MOS pipe 12 and disconnect.
The control method of a kind of lithium battery group three-layer protection system of the present embodiment, is applicable to above-mentioned a kind of lithium battery group three-layer protection system, comprises the following steps:
S1: battery management control modules gathers the voltage of each cell, and these voltage datas are sent to the first controller, second controller detects in lithium battery group whether have lithium battery electrolytes volatilization gas by electrolyte gas sensor, detected the temperature of lithium battery group by temperature sensor, detect the pressure in lithium battery group between cell and battery case by pressure sensor;
S2: when the voltage of at least one cell be greater than higher limit K1 or lower than lower limit K2 time, battery management control modules control switch module disconnects, and lithium battery group stops discharge and recharge, prevents from lithium battery group from overcharging or cross putting; When the voltage of at least one cell be greater than higher limit K3 or lower than lower limit K4 time, K3 > K1, K4 < K2, the first controller control switch module disconnects, lithium battery group stop discharge and recharge, simultaneously control indicator light light, buzzer call report to the police; When electrolyte gas sensor detect temperature value that lithium battery electrolytes volatilization gas or temperature sensor detect exceed force value that set point or pressure sensor detect exceed set point time, second controller control switch module disconnects, output current is to the control end of three end fuses simultaneously, make three end blown fuses, the electrolyte preventing lithium battery group from causing because of super-charge super-discharge is revealed, temperature is too high or flatulence expansion bulge.
Claims (6)
1. a lithium battery group three-layer protection system, it is characterized in that: comprise battery management control modules (1), monomer battery voltage acquisition interface (2), first controller (3), second controller (4), switch module (5), three end fuses (6), electrolyte gas sensor (7) and alarm module, described three end fuses (6), lithium battery group (15), switch module (5) and load (14) are connected into a loop, cell in described lithium battery group (15) is electrically connected with battery management control modules (1) by monomer battery voltage acquisition interface (2), described first controller (3) is electrically connected with battery management control modules (1) and alarm module respectively, described second controller (4) is electrically connected with the control end of three end fuses (6) and electrolyte gas sensor (7) respectively, the control end of described switch module (5) and battery management control modules (1), first controller (3) and second controller (4) electrical connection.
2. a kind of lithium battery group three-layer protection system according to claim 1, is characterized in that: also comprise the temperature sensor (8) for detecting lithium battery group temperature, described temperature sensor (8) is electrically connected with second controller (4).
3. a kind of lithium battery group three-layer protection system according to claim 1 and 2; it is characterized in that: also comprise the pressure sensor (9) be arranged between lithium battery group (15) interior cell and battery case, described pressure sensor (9) is electrically connected with second controller (4).
4. a kind of lithium battery group three-layer protection system according to claim 1 and 2; it is characterized in that: described alarm module comprises indicator light (10) and buzzer (11), described indicator light (10) and buzzer (11) are electrically connected with the first controller (3) respectively.
5. a kind of lithium battery group three-layer protection system according to claim 1 and 2, it is characterized in that: described switch module comprises N-MOS pipe (12) and the 2nd N-MOS and manages (13), the positive pole of described lithium battery group (15) is electrically connected with load (14) positive pole by three end fuses (6), the S pole that negative pole one end and a N-MOS of described lithium battery group (15) manage (12) is electrically connected, the D pole of the one N-MOS pipe (12) is electrically connected with the D pole that the 2nd N-MOS manages (13), the S pole of the 2nd N-MOS pipe (13) is connected with load (14) negative electricity, described battery management control modules (1) is managed the G pole that the G pole of (12) and the 2nd N-MOS manage (13) respectively and is electrically connected with a N-MOS, described first controller (3) is managed the G pole that the G pole of (12) and the 2nd N-MOS manage (13) respectively and is electrically connected with a N-MOS, described second controller (4) is managed the G pole that the G pole of (12) and the 2nd N-MOS manage (13) respectively and is electrically connected with a N-MOS.
6. a control method for lithium battery group three-layer protection system, is applicable to a kind of lithium battery group three-layer protection system according to claim 3, it is characterized in that, comprise the following steps:
S1: battery management control modules gathers the voltage of each cell, and these voltage datas are sent to the first controller, second controller detects in lithium battery group whether have lithium battery electrolytes volatilization gas by electrolyte gas sensor, detected the temperature of lithium battery group by temperature sensor, detect the pressure in lithium battery group between cell and battery case by pressure sensor;
S2: when the voltage of at least one cell be greater than higher limit K1 or lower than lower limit K2 time, battery management control modules control switch module disconnects, and lithium battery group stops discharge and recharge; When the voltage of at least one cell be greater than higher limit K3 or lower than lower limit K4 time, K3 > K1, K4 < K2, the first controller control switch module disconnects, lithium battery group stops discharge and recharge, controls alarm module simultaneously and sends warning; When electrolyte gas sensor detect temperature value that lithium battery electrolytes volatilization gas or temperature sensor detect exceed force value that set point or pressure sensor detect exceed set point time, second controller control switch module disconnects, output current is to the control end of three end fuses simultaneously, makes three end blown fuses.
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| CN106114230A (en) * | 2016-07-28 | 2016-11-16 | 肇庆高新区凯盈顺汽车设计有限公司 | Cell management system of electric automobile |
| CN106486976A (en) * | 2016-11-23 | 2017-03-08 | 宇龙计算机通信科技(深圳)有限公司 | Battery protecting apparatus and battery protecting method |
| WO2018068275A1 (en) * | 2016-10-13 | 2018-04-19 | 深圳易马达科技有限公司 | Storage battery and protection device thereof |
| CN109066871A (en) * | 2018-08-30 | 2018-12-21 | 苏州宏奇锐自动化有限公司 | A kind of charging protection device for electric vehicle monitoring pressure |
| CN109217261A (en) * | 2018-09-30 | 2019-01-15 | 缙云县锐普电子科技有限公司 | Lithium electric system |
| CN109407011A (en) * | 2018-09-21 | 2019-03-01 | 合肥国轩高科动力能源有限公司 | Method for evaluating upper limit safety boundary constraint force in use of ternary square aluminum shell battery cell |
| CN112186853A (en) * | 2020-09-30 | 2021-01-05 | 宁波新舜信息科技有限公司 | Power management system with multiple protection |
| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
| CN115954987A (en) * | 2023-02-03 | 2023-04-11 | 深圳市凌鑫电子有限公司 | Lithium battery charging secondary protection circuit |
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