CN209134076U - A kind of lithium battery undervoltage protection device - Google Patents
A kind of lithium battery undervoltage protection device Download PDFInfo
- Publication number
- CN209134076U CN209134076U CN201821714183.3U CN201821714183U CN209134076U CN 209134076 U CN209134076 U CN 209134076U CN 201821714183 U CN201821714183 U CN 201821714183U CN 209134076 U CN209134076 U CN 209134076U
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- lithium battery
- switch
- bms
- power module
- charge
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model provides a kind of lithium battery undervoltage protection device, including charging and discharging lithium battery circuit, and charging and discharging lithium battery circuit includes lithium battery group, BMS, DC power module, external loading switch, charge switch and reset switch；The anode of lithium battery group is connected to electric discharge positive terminal and charging positive terminal by external loading switch and charge switch respectively, and the cathode of lithium battery group is connected to charge and discharge negative pole end；BMS connection DC power module, BMS are also connected with the second current-limiting resistance, and the second current-limiting resistance other end is connected between charging positive terminal and charge switch；DC power module is in parallel with lithium battery group, fuse, relay and diode are successively arranged on DC power module and the cathode circuit in parallel of lithium battery group, the circuit of the circuit both ends parallel connection reset switch of relay and diode, reset switch and relay parallel connected end is equipped with the first current-limiting resistance.The BMS battery pack overdischarge problem that the utility model effective protection does not have external power supply to supply.
Description
Technical field
The utility model belongs to li-ion cell protection technical field, and in particular to a kind of lithium battery undervoltage protection device.
Background technique
Many low-speed vehicles do not have external 12V storage battery, and lithium battery management system BMS needs a stable 12V power supply to supply
Electricity there are many directly powered using DC outside vehicle to BMS in the market, requires the normal electricity of battery in this way and be supplied to
DC, often electricity causes no external power supply to supply without may result in the case where electric quantity of lithium battery is vented by BMS control for this
The BMS battery pack overdischarge damage battery given.
Utility model content
The purpose of the utility model is to provide a kind of lithium battery undervoltage protection device, effective protection does not have external power supply supply
BMS battery pack overdischarge problem.
The utility model provides the following technical solution:
A kind of lithium battery undervoltage protection device, including charging and discharging lithium battery circuit, the charging and discharging lithium battery circuit include
Lithium battery group, BMS, DC power module, external loading switch, charge switch and reset switch, the charging and discharging lithium battery circuit
On be respectively equipped with electric discharge positive terminal, charging positive terminal and charge and discharge negative pole end；The anode of the lithium battery group is respectively by described
External loading switch and the charge switch are connected to the electric discharge positive terminal and the charging positive terminal, the lithium battery group
Cathode connection is described to the charge and discharge negative pole end；The BMS connection DC power module, the BMS are also connected with second
Current-limiting resistance, the second current-limiting resistance other end are connected between the charging positive terminal and the charge switch；The DC
Power module is in parallel with the lithium battery group, successively sets on the DC power module and the cathode circuit in parallel of the lithium battery group
There are fuse, relay and diode, the circuit both ends of the relay and the diode reset switch in parallel is described
Reset switch and the circuit of the relay parallel connected end are equipped with the first current-limiting resistance.
Preferably, lithium battery group point in parallel with the anode of the DC power module and external loading switch and institute
It states and is equipped with fuse between charge switch.
Preferably, current divider is equipped between the cathode of the lithium battery group and the charge and discharge negative pole end.
Preferably, the DC power module connects the BMS and provides power supply for it, and the DC power module provides 12V electricity
The BMS is given in source.
Preferably, when the BMS given threshold 3.0V, the external loading switch, the BMS given threshold 2.5V are disconnected
When, disconnect the relay.
The beneficial effects of the utility model are: device is DC electricity by the way that two-way circuit is arranged in charging and discharging lithium battery circuit
Source module power supply is realized that self-locking and self-locking power supply of powering releases and is automatically switched, so that realizing prevents BMS battery pack in no outside
Overdischarge in the case where power supply protects BMS battery pack, improves its service life；In addition, device passes through circuit design,
When charging, it can prevent external charging machine instantaneous high pressure or high current from BMS being caused to damage.
Detailed description of the invention
Attached drawing is used to provide a further understanding of the present invention, and constitutes part of specification, practical with this
Novel embodiment is used to explain the utility model together, does not constitute limitations of the present invention.In the accompanying drawings:
Fig. 1 is the utility model structure diagram；
In the figure, it is marked as 1. lithium battery groups；2. discharge positive terminal；3. charge positive terminal；4. charge and discharge negative pole end；F. insure
Silk；FU. fuse；R1. the first current-limiting resistance；R2. the second current-limiting resistance；RW. current divider；D1. diode；K1. external loading
Switch；K2. charge switch；K3. relay；K4. reset switch.
Specific embodiment
As shown in Figure 1, a kind of lithium battery undervoltage protection device, including charging and discharging lithium battery circuit, charging and discharging lithium battery electricity
Road includes that lithium battery group 1, BMS, DC power module, external loading switch K1, charge switch K2 and reset switch K4, lithium battery fill
Electric discharge positive terminal 2, charging positive terminal 3 and charge and discharge negative pole end 4 are respectively equipped on discharge circuit；The anode of lithium battery group 1 is respectively
Electric discharge positive terminal 2 and charging positive terminal 3, the cathode of lithium battery group 1 are connected to by external loading switch K1 and charge switch K2
It is connected to charge and discharge negative pole end 4, current divider RW is equipped between the cathode and charge and discharge negative pole end 4 of lithium battery group 1.BMS connection DC
Power module, BMS are also connected with the second current-limiting resistance R2, and the second current-limiting resistance R2 other end is connected to charging positive terminal 3 and fills
Between electric switch K2；DC power module is in parallel with lithium battery group 1, and lithium battery group 1 is with the positive point in parallel of DC power module and outside
Fuse FU is equipped between section load switch K1 and charge switch K2.The cathode circuit in parallel of DC power module and lithium battery group 1
On be successively arranged fuse F, relay K3 and diode D1, the circuit both ends parallel connection reset switch of relay K3 and diode D1
The circuit of K4, reset switch K4 and relay K3 parallel connected end is equipped with the first current-limiting resistance R1.
As shown in Figure 1, a kind of lithium battery undervoltage protection device is in use, and long-pressing reset switch K4, reset switch 4
It is mountable at vehicle switch, is used for one-key start button.1 cathode power supply of lithium battery group passes through fuse F and the first current limliting electricity
Hinder R1 and reset switch K4 and give DC power module power supply, what is taken due to reset switch K4 is normal electricity, fuse F ensure to install or
User of service's external short circuit causes danger, the first current-limiting resistance R1 ensure reset switch K4 using when transient high-current cause out
Contact damage is closed, value is according to DC power module power decision.DC power module starting provides 12V power supply and powers on to BMS, BMS
Self-test confirms that errorless unlatching relay K3,1 cathode power supply of lithium battery group change path by relay K3 and diode D1 to DC
Power module power supply, whole device is in power supply self-locking state at this time.In power supply process, once battery single-unit voltage is lower than
When the threshold value 3.0V of BMS setting, disconnection external loading switch K1 first, if battery single-unit voltage is lower than BMS setting value 2.5V
When, the power switch relay K3 for disconnecting DC power module is forced, releasing power supply is self-locking, and whole device is in 0 power consumption shape at this time
State.Further, when long-pressing reset switch K4 and BMS receive the charging signals by the second current-limiting resistance R2, starting DC electricity
The power switch relay K3 of source module powers to BMS, and BMS is attracted charge switch K2, and the second current-limiting resistance R2 effect at this time is
Prevent external charging machine instantaneous high pressure or high current from BMS being caused to damage.Above-mentioned apparatus structure, effective protection, which may be implemented, not to be had
The BMS battery pack overdischarge problem of external power supply supply.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, although ginseng
The utility model is described in detail according to previous embodiment, it for those skilled in the art, still can be with
It modifies the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.It is all
Within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in practical
Within novel protection scope.
Claims (5)
1. a kind of lithium battery undervoltage protection device, which is characterized in that including charging and discharging lithium battery circuit, the charging and discharging lithium battery
Circuit includes that lithium battery group, BMS, DC power module, external loading switch, charge switch and reset switch, the lithium battery fill
Electric discharge positive terminal, charging positive terminal and charge and discharge negative pole end are respectively equipped on discharge circuit；The anode of the lithium battery group is respectively
The electric discharge positive terminal and the charging positive terminal, the lithium are connected to by external loading switch and the charge switch
The cathode connection of battery pack is described to the charge and discharge negative pole end；The BMS connection DC power module, the BMS also connect
Be connected to the second current-limiting resistance, the second current-limiting resistance other end be connected to the charging positive terminal and the charge switch it
Between；The DC power module is in parallel with the lithium battery group, DC power module anode electricity in parallel with the lithium battery group
Road is successively arranged fuse, relay and diode, and the circuit both ends parallel connection of the relay and the diode is described multiple
The circuit of bit switch, the reset switch and the relay parallel connected end is equipped with the first current-limiting resistance.
2. a kind of lithium battery undervoltage protection device according to claim 1, which is characterized in that the lithium battery group with it is described
Fuse is equipped between the anode of DC power module point in parallel and external loading switch and the charge switch.
3. a kind of lithium battery undervoltage protection device according to claim 1, which is characterized in that the cathode of the lithium battery group
Current divider is equipped between the charge and discharge negative pole end.
4. a kind of lithium battery undervoltage protection device according to claim 1, which is characterized in that the DC power module connection
The BMS provides power supply for it, and the DC power module provides 12V power supply to the BMS.
5. a kind of lithium battery undervoltage protection device according to claim 1, which is characterized in that the BMS given threshold
When 3.0V, external loading switch is disconnected, when the BMS given threshold 2.5V, disconnect the relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821714183.3U CN209134076U (en) | 2018-10-23 | 2018-10-23 | A kind of lithium battery undervoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821714183.3U CN209134076U (en) | 2018-10-23 | 2018-10-23 | A kind of lithium battery undervoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209134076U true CN209134076U (en) | 2019-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821714183.3U Active CN209134076U (en) | 2018-10-23 | 2018-10-23 | A kind of lithium battery undervoltage protection device |
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| CN (1) | CN209134076U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114497905A (en) * | 2020-11-13 | 2022-05-13 | 智一新能源发展有限公司 | Improved anti-reverse device, battery cluster and battery module thereof |
-
2018
- 2018-10-23 CN CN201821714183.3U patent/CN209134076U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114497905A (en) * | 2020-11-13 | 2022-05-13 | 智一新能源发展有限公司 | Improved anti-reverse device, battery cluster and battery module thereof |
| CN114497905B (en) * | 2020-11-13 | 2024-06-11 | 智一新能源发展有限公司 | Improved anti-reflection device, battery cluster and battery module thereof |
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