CN213484563U - Lithium cell group MOS manages failure protection system - Google Patents
Lithium cell group MOS manages failure protection system Download PDFInfo
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- CN213484563U CN213484563U CN202121000818.5U CN202121000818U CN213484563U CN 213484563 U CN213484563 U CN 213484563U CN 202121000818 U CN202121000818 U CN 202121000818U CN 213484563 U CN213484563 U CN 213484563U
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- battery pack
- lithium battery
- resistor
- node
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 71
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims 3
- 229910001416 lithium ion Inorganic materials 0.000 claims 3
- 238000000034 method Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- DOCYQLFVSIEPAG-UHFFFAOYSA-N [Mn].[Fe].[Li] Chemical compound [Mn].[Fe].[Li] DOCYQLFVSIEPAG-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The utility model provides a lithium cell group MOS manages failure protection system, connects detection module including the charger, the charging current detection module, singlechip and self-destruction module, when the singlechip was gathered lithium cell group and has been always pressed and has reached overcharge protection voltage, issue the instruction and give front end protection chip output drive signal and close the MOS pipe that charges, if front end protection chip detects the charger and has connected, and still gather the charging current, then judge for the MOS pipe short circuit that charges that became invalid, with MOS pipe short circuit information feedback to singlechip. The singlechip outputs a self-destruction driving signal to drive the P + end to be conducted with the battery B-, so that the fuse is rapidly burnt out, the positive pole loop of the lithium battery pack is cut off, and the safety of the lithium battery pack is ensured.
Description
Technical Field
The utility model relates to a MOS manages the protection field, concretely relates to MOS pipe failure protection system of lithium cell group.
Background
The switching device who generally uses the MOS pipe as charge-discharge circuit in the present lithium battery protection shield, and charge-discharge MOS pipe is punctureed and the short circuit by high pressure in the electric motor car lithium cell group easily, and in practice, lithium cell group can lead to overcharging and then cause the condition that the lithium cell group takes place the burning or even explosion because of the MOS pipe is punctured the back short circuit. At present, the mainstream measures for the phenomenon are to protect the MOS transistor from breakdown, for example, a higher voltage-resistant MOS transistor is adopted, a special charger consistent with the communication protocol of the lithium battery pack is used, and voltage-stabilizing tubes are added at two ends of the MOS transistor.
These schemes often address the symptoms and do not address the root causes, can not protect the MOS pipe completely, can not ensure completely that the MOS pipe is not punctured, also can not protect the lithium cell group not overcharged when the MOS pipe is invalid. The MOS tube generally occupies one third of the cost of the protection plate, and the use of the MOS tube with high voltage resistance and the addition of the voltage stabilizing tube bring higher cost; furthermore, the current voltage-withstanding grade cannot be accurately defined, a unified charging protocol is not available in the electric vehicle market at present, the cost is increased by using a special charger, and a user cannot be charged the lithium battery pack by mistakenly using other brand chargers.
Disclosure of Invention
According to the problem that the background art provided, the utility model provides a MOS pipe failure protection system of lithium cell group solves, it is right next the utility model discloses do further to explain.
A lithium battery pack MOS tube failure protection system comprises a charger connection detection module, a failure detection module and a failure detection module, wherein the charger connection detection module is used for acquiring the connection state of a charger; the charging current detection module is used for acquiring whether charging current exists or not; the single chip microcomputer is internally provided with a logic control program and is electrically connected with the charger connection detection module and the charging current detection module; the self-destruction type lithium battery pack further comprises a self-destruction module connected between the lithium battery pack and the output end of the lithium battery pack, and the self-destruction type lithium battery pack comprises resistors R1, R2 and R3 which are connected in series, one end of the resistor R1 is connected to the total positive B + end of the lithium battery pack, one end of the resistor R3 is grounded, a node between the resistor R3 and the ground point is further connected with a resistor R7, and the resistor R7 is connected to the total negative B-end of the lithium battery; a node between the resistors R1 and R2, a node between the resistor R3 and the grounding point are connected with a capacitor C1, and a node between the resistors R2 and R3 is provided with an SVCMP port; the battery pack further comprises resistors R4, R5 and R6 which are connected in series, a node between the resistors R1 and R2 is connected with a drain electrode of the MOS tube Q1, a grid electrode of the MOS tube Q1 is connected with the single chip microcomputer to obtain a KILLME self-destruction signal output by the single chip microcomputer, a source electrode is connected to a node between the resistors R4 and R5, a resistor R4 is connected to a source electrode of the MOS tube Q1, the resistor R6 is grounded, a node between the resistors R5 and R6 is connected with a grid electrode of the MOS tube Q2, a drain electrode of the MOS tube Q2 is connected to a positive electrode P + end of the lithium battery pack output, and a; and a fuse F1 is arranged between the positive B + end of the lithium battery pack and the positive P + end of the lithium battery pack output.
The self-destruction circuit has the working logic that when the single chip microcomputer collects that the total voltage of the lithium battery pack reaches the overcharge protection voltage, an instruction is issued to output a driving signal to the front-end protection chip to close the charging MOS tube, if the front-end protection chip detects that the charger is connected and still collects the charging current, the charging MOS tube is judged to be in failure and short circuit, and the short circuit information of the MOS tube is fed back to the single chip microcomputer. The singlechip outputs a self-destruction driving signal to drive the P + end to be conducted with the battery B-, so that the fuse is rapidly burnt out, the positive pole loop of the lithium battery pack is cut off, and the safety of the lithium battery pack is ensured.
Has the advantages that: compared with the prior art, the utility model discloses having increased a fuse F1 between lithium cell group output positive pole P + end and lithium cell group total positive B + end, a self-destruction circuit has been designed at lithium cell group output positive pole P + end simultaneously, take place to charge and discharge MOS pipe inefficacy short circuit when lithium cell group, and the charger continues to charge to lithium cell group, when there is the possibility of overcharging, software control self-destruction circuit work, the fuse in the positive pole discharge circuit burns out, lithium cell group can't continue to charge and discharge the action, ensure lithium cell group safety.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
A specific embodiment of the present invention will be described in detail with reference to fig. 1.
A lithium battery pack MOS tube failure protection system comprises a charger connection detection module, a failure detection module and a failure detection module, wherein the charger connection detection module is used for acquiring the connection state of a charger; the charging current detection module is used for acquiring whether charging current exists or not; the single chip microcomputer is internally provided with a logic control program and is electrically connected with the charger connection detection module and the charging current detection module; the charger connection detection module and the charging current detection module are both in the prior art, and further explanation is not provided in the embodiment.
Still including connecting the self-destruction module between lithium cell group and lithium cell group output, refer to fig. 1, include: resistors R1, R2 and R3 are connected in series, one end of a resistor R1 is connected to the positive B + end of the lithium battery pack, one end of a resistor R3 is grounded, a node between the resistor R3 and the ground point is also connected with a resistor R7, and a resistor R7 is connected to the negative B-end of the lithium battery pack; a node between the resistors R1 and R2, a node between the resistor R3 and the grounding point are connected with a capacitor C1, and a node between the resistors R2 and R3 is provided with an SVCMP port; the battery pack further comprises resistors R4, R5 and R6 which are connected in series, a node between the resistors R1 and R2 is connected with a drain electrode of the MOS tube Q1, a grid electrode of the MOS tube Q1 is connected with the single chip microcomputer to obtain a KILLME self-destruction signal output by the single chip microcomputer, a source electrode is connected to a node between the resistors R4 and R5, a resistor R4 is connected to a source electrode of the MOS tube Q1, the resistor R6 is grounded, a node between the resistors R5 and R6 is connected with a grid electrode of the MOS tube Q2, a drain electrode of the MOS tube Q2 is connected to a positive electrode P + end of the lithium battery pack output, and a; and a fuse F1 is arranged between the positive B + end of the lithium battery pack and the positive P + end of the lithium battery pack output.
After resistors R1, R2 and R3 are divided, if the voltage reaches the overcharge protection voltage set by the lithium battery pack at the SVCMP port, the single chip sends an instruction to enable the front-end protection chip to drive the charging MOS tube to be closed, and if the charging MOS tube is broken down, the lithium battery pack is short-circuited after the MOS tube is broken down, so that overcharge is caused, and the lithium battery pack is burnt or even exploded.
In this embodiment, if the charger connection detection module detects that the charger is in a connection state and the charging current detection module detects that no charging current exists, it indicates that the charging MOS transistor is turned off; if the charger connection detection module detects that the charger is in a connection state and the charging current detection module detects that the charging current still exists, the charging MOS tube is indicated to be failed and short-circuited, and at the moment, the front-end protection chip feeds back failure information of the charging MOS tube and triggers the single chip microcomputer to output a KILLME self-destruction signal.
KILLME self-destruction signal drive MOS pipe Q1 switches on, MOS pipe Q1 switches on the back, total voltage drives MOS pipe Q2 after through resistance R1, R2, R3, R5, R6 partial pressure and switches on, this moment, lithium cell group output positive pole P + end connects to lithium cell group total negative B-end in other words, also connect to lithium cell group total negative B-end behind fuse F1 in other words, cause the short circuit of lithium cell group, burn out the fuse in the twinkling of an eye, and then ensure that lithium cell group can not continue to charge because of the MOS pipe that charges is out of work short circuit, avoid causing the condition emergence that overcharges and cause the incident.
The lithium battery packs with different voltage platforms need to be charged by corresponding voltage platform chargers, if the lithium battery packs are not noticed, the high voltage platform chargers can be used for charging the lithium batteries with the low voltage platforms, so that the MOS tubes are broken down at high voltage, and based on the condition that the quality of the chargers is uneven, high-voltage pulses can appear during charging, and the MOS tubes can also be broken down; based on this, the working voltage of lithium cell group is 12V ~72V, also compatible each type front end protection chip, is applicable to lithium iron phosphate, lithium iron manganese, ternary lithium cell etc..
The utility model discloses having increased a fuse F1 between lithium cell group output positive pole P + end and lithium cell group total positive B + end, having designed a self-destruction circuit simultaneously at lithium cell group output positive pole P + end, take place charge-discharge MOS pipe inefficacy short circuit when lithium cell group, and the charger continues to charge lithium cell group, when having the possibility of overcharging, software control self-destruction circuit work, the fuse in the positive pole discharge circuit burns out, lithium cell group can't continue to carry out the charge-discharge action, ensure lithium cell group safety.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A lithium battery pack MOS tube failure protection system comprises:
the charger connection detection module is used for acquiring the connection state of the charger;
the charging current detection module is used for acquiring whether charging current exists or not;
the single chip microcomputer is internally provided with a logic control program and is electrically connected with the charger connection detection module and the charging current detection module;
the method is characterized in that:
the self-destruction lithium ion battery pack also comprises a self-destruction module connected between the lithium ion battery pack and the output end of the lithium ion battery pack;
the self-destruction module comprises resistors R1, R2 and R3 which are connected in series, one end of the resistor R1 is connected to the total positive B + end of the lithium battery pack, one end of the resistor R3 is grounded, a node between the resistor R3 and the ground point is also connected with a resistor R7, and the resistor R7 is connected to the total negative B-end of the lithium battery pack; a node between the resistors R1 and R2, a node between the resistor R3 and the grounding point are connected with a capacitor C1, and a node between the resistors R2 and R3 is provided with an SVCMP port; the battery pack further comprises resistors R4, R5 and R6 which are connected in series, a node between the resistors R1 and R2 is connected with a drain electrode of the MOS tube Q1, a grid electrode of the MOS tube Q1 is connected with the single chip microcomputer to obtain a KILLME self-destruction signal output by the single chip microcomputer, a source electrode is connected to a node between the resistors R4 and R5, a resistor R4 is connected to a source electrode of the MOS tube Q1, the resistor R6 is grounded, a node between the resistors R5 and R6 is connected with a grid electrode of the MOS tube Q2, a drain electrode of the MOS tube Q2 is connected to a positive electrode P + end of the lithium battery pack output, and a; and a fuse F1 is arranged between the positive B + end of the lithium battery pack and the positive P + end of the lithium battery pack output.
2. The lithium battery pack MOS tube failure protection system of claim 1, wherein:
the voltage of the lithium battery pack is 12V-72V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121000818.5U CN213484563U (en) | 2021-05-12 | 2021-05-12 | Lithium cell group MOS manages failure protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121000818.5U CN213484563U (en) | 2021-05-12 | 2021-05-12 | Lithium cell group MOS manages failure protection system |
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| Publication Number | Publication Date |
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| CN213484563U true CN213484563U (en) | 2021-06-18 |
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| CN202121000818.5U Active CN213484563U (en) | 2021-05-12 | 2021-05-12 | Lithium cell group MOS manages failure protection system |
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2021
- 2021-05-12 CN CN202121000818.5U patent/CN213484563U/en active Active
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| CP03 | Change of name, title or address |
Address after: 313000 No.18, Baoqiao Road, Huaxi street, Changxing County, Huzhou City, Zhejiang Province Patentee after: Zhejiang Tianneng Energy Storage Technology Development Co.,Ltd. Country or region after: China Address before: 313000 Tianneng group, 18 Baoqiao Road, Changxing County, Huzhou City, Zhejiang Province Patentee before: Tianneng Shuai Fude Energy Co.,Ltd. Country or region before: China |
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