CN211405459U - Lithium battery protection board with high current - Google Patents
Lithium battery protection board with high current Download PDFInfo
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- CN211405459U CN211405459U CN202020091891.7U CN202020091891U CN211405459U CN 211405459 U CN211405459 U CN 211405459U CN 202020091891 U CN202020091891 U CN 202020091891U CN 211405459 U CN211405459 U CN 211405459U
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Abstract
The utility model provides a lithium battery protection shield of heavy current, include: the protection shield body, casing and cap, and still include relay and group battery, use the protection shield body, be connected the protection shield body with the group battery electricity, then the relay is connected with the protection shield body electricity, when connecting the load and discharging, the low level of protection shield body output, the relay does not move, the anodal relay normal close point output that passes through of group battery, to the load power supply, when detecting that arbitrary section battery in the group battery is in when overdischarging (being less than under-voltage threshold value 2.5V), the high level of protection shield body output, the coil circular telegram in the relay, the normal close point is cut off and is gone into the protection state. The protection state can be exited only after each battery in the battery pack is detected to reach the threshold value, so that the protection effect on the lithium battery is well ensured.
Description
Technical Field
The utility model relates to a lithium cell technical field especially relates to a lithium battery protection board of heavy current.
Background
At present, the starting batteries of the fuel-powered automobile on the market are basically 12V or 24V lead-acid storage batteries, and the capacities of the starting batteries are 45AH, 60AH, 70AH, 80AH, 90AH, 100AH and the like. The lead-acid storage battery has heavy volume and general low-temperature performance, and the most main problem is that the environmental pollution is large, particularly the large pollution exists in the old battery. Both lead and acid are sources of pollution. The country greatly controls the environmental pollution and increases the popularization of new energy automobiles. The new energy battery mainly comprises a lithium battery. The lithium battery has high energy density and low-temperature performance. At present, fuel automobiles occupy a large amount, and the replacement of lead-acid batteries by lithium batteries is one of the current pollution solving methods.
As is well known, the novel lithium battery pack also gradually replaces the old lead-acid battery pack to be used for electric bicycles and electric automobiles, and the lithium battery has a series of advantages of lightness, high performance and the like, so that the electric tool is more convenient and efficient. Each manufacturer also produces corresponding lithium battery protection plates for different types of lithium batteries to ensure the safety of the batteries and a series of protection measures for the batteries.
Because of the characteristics of the lithium battery, the discharge current is large, and the lithium battery is suitable for being used as an automobile starting battery. However, lithium batteries have a limit in discharge, and therefore must be protected. Most of lithium battery protection plates currently on the market are protection plates with low current of less than 100A. The starting current of the automobile is far larger than 100A, and some manufacturers also produce lithium battery protection plates larger than 100A, but the price is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model adopts the following technical scheme: a high current lithium battery protection plate comprising: the protection plate comprises a protection plate body, a shell and a shell cover;
the inner part of the shell is provided with a cavity, a circle of positioning block is sleeved on the outer side of the shell, a plurality of through holes are formed in the positioning block, a plurality of grids are arranged at the bottom of the cavity, a plurality of protruding blocks are arranged on the side wall of the cavity and correspond to the protruding blocks, a plurality of fixing columns are further arranged at two ends of the bottom of the cavity, and the fixing columns are arranged at intervals;
the shell cover is provided with a display screen, a first groove and a second groove are formed in the shell cover, a first wiring terminal is arranged in the first groove, a second wiring terminal is arranged in the second groove, and the first wiring terminal and the second wiring terminal are electrically connected with the display screen through wires;
the protection plate body is arranged in the cavity;
the protective plate body is electrically connected with the protective plate body;
the protection plate body is electrically connected with the battery pack.
Furthermore, each fixing column is arranged above one grid.
Further, still include the temperature detector, the temperature detector with protection shield body electrical signal connection.
Furthermore, the power supply also comprises a current-limiting resistor and a diode, wherein one end of the current-limiting resistor is connected with the diode in series, and the other end of the current-limiting resistor is used for being connected with an external power supply.
Furthermore, a placing groove is formed in the shell cover, a handle is arranged on the shell cover, the handle is connected with the shell cover in a rotating mode, and the handle is arranged in the placing groove in a rotating mode.
The utility model has the advantages that: the protection board body is used and electrically connected with the battery pack, then the relay is electrically connected with the protection board body, when a load is connected to discharge, the protection board body outputs low level, the relay does not act, the positive pole of the battery pack is output through the normally closed point of the relay to supply power to the load, when any battery in the battery pack is detected to be over-discharged (lower than the under-voltage threshold value of 2.5V), the protection board body outputs high level, the coil in the relay is electrified, and the normally closed point is disconnected to enter a protection state. The protection state can be exited only after each battery in the battery pack is detected to reach the threshold value, so that the protection effect on the lithium battery is well ensured.
Drawings
The figures further illustrate the invention, but the embodiments in the figures do not constitute any limitation of the invention.
Fig. 1 is a schematic view of an overall structure of a high-current lithium battery protection board according to an embodiment;
fig. 2 is a schematic diagram of an internal structure of a high-current lithium battery protection board according to an embodiment;
fig. 3 is a schematic connection diagram of a lithium battery protection board according to an embodiment.
Detailed Description
The following will combine the drawings of the embodiments of the present invention to further describe the technical solution of the present invention, and the present invention is not limited to the following specific embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1 to 3, a high-current lithium battery protection plate includes: the protection plate comprises a protection plate body 500, a shell 100 and a shell cover 200, wherein a cavity is arranged in the shell 100, a circle of positioning blocks 300 is sleeved outside the shell 100, a plurality of through holes 310 are formed on the positioning block 300, a plurality of grids 110 are arranged at the bottom of the cavity, and the side wall of the cavity is provided with a plurality of convex blocks 120, the plurality of convex blocks 120 are correspondingly arranged, and the two ends of the bottom of the cavity are also provided with a plurality of fixing columns 130, the fixing columns 130 are arranged at intervals, the shell cover 200 is provided with a display screen 400, and the housing cover 200 is provided with a first groove 210 and a second groove 220, a first binding post 410 is arranged in the first groove 210, a second binding post 420 is arranged in the second groove 220, the first binding post 410 and the second binding post 420 are electrically connected with the display screen 400 through a conducting wire, and the protection board body 500 is arranged in the cavity.
Specifically, each of the fixing posts 130 is disposed above one of the grids 110, and the lithium battery protection plate further includes a temperature detector 800, the temperature detector 800 is electrically connected to the protection plate body 500, the lithium battery protection plate further includes a relay 600, the relay 600 is electrically connected to the protection plate body 500, the lithium battery protection plate further includes a battery pack 700, the battery pack 700 is electrically connected to the protection plate body 500, the lithium battery protection plate further includes a current limiting resistor 920 and a diode 910, one end of the current limiting resistor 920 is connected in series to the diode 910, and the other end of the current limiting resistor 920 is connected to an external power supply.
That is, the temperature detector 800, the relay 600, the battery pack 700, the current limiting resistor 920, and the diode 910 are put together in the case 100 and then electrically connected to the battery pack 700 through the protection plate body 500. Specifically, when discharging is needed after the battery pack is connected with a load, the protection board body 500 outputs a low level, the relay 600 does not operate, the positive electrode of the battery pack 700 is output through the normally closed point of the relay 600 to supply power to the load, further, the relay 600 is a normally closed contact, the battery pack 700 normally supplies power to the load to output, and the output current is generally below 30A; when the automobile starts the motor, the maximum contact current can bear 500A, and the requirement of large-current starting is met. Further, the battery pack 700 includes several batteries, that is, the number of specific batteries can be specifically set according to specific requirements, which is not described redundantly in this embodiment. When any battery is detected to be over-discharged (lower than the under-voltage threshold value of 2.5V), the protection board body 500 outputs high level, the coil in the relay 600 is electrified, and the normally closed point is switched off to enter a protection state. The protection state is exited only after each battery is detected to have reached a threshold value. When the charger is connected, although the relay 600 is in a protection state, the charger may communicate with the positive electrode of the battery through the diode 910, and charge the battery pack 700 with a small current. During charging, when the voltage of each battery of the battery pack 700 is higher than the undervoltage threshold, the coil of the relay 600 is powered off, the normally closed contact of the relay is connected, and the charger continues to charge the battery. When the voltage of each battery of the battery pack 700 is higher than the threshold value, the relay 600 is powered off, and the charger can still be communicated with the anode of the battery through the diode 910 to charge the battery pack 700 with low current.
It should be noted that, in order to adapt to a large capacitive load, the protection board body 500 is provided with an overcurrent threshold voltage, and the threshold voltage can be set to different delay times, that is, an overcurrent protection mode is adopted. The overcurrent protection can provide a quick response to a short circuit, and can enable the battery pack 700 to bear a certain surge current so as to prevent unnecessary overcurrent protection action caused by large capacity of the filter capacitor.
Further, the lithium battery protection board is also provided with a current detection sensor, and the current detection sensor is connected between the negative electrode of the battery and the load. When the voltage drop across the current detection sensor exceeds a certain threshold, the overcurrent protection enters an intermittent mode. In this mode, the relay 600 is periodically turned off and on until the fault is cleared. And once the fault is eliminated, the normal working state is automatically recovered. The overcurrent protection threshold is 0.3V (corresponding to an output current of 30A), and the duration exceeds the set time to enter the intermittent operation mode, and the duty ratio of the output pulse is about 10%, that is, the off time of the relay 600 is about 9 times of the on time. When the charging voltage of a certain battery exceeds the charging threshold, the relay 600 is electrified for protection, the normally closed point is turned off, and the battery enters an overvoltage protection state. The charger may still communicate with the positive battery terminal through the diode 910 to charge the battery pack 700 with a small current.
In one embodiment, the housing cover 200 further has a placement groove 230, a handle 240 is disposed on the housing cover 200, the handle 240 is rotatably connected to the housing cover 200, and the handle 240 is rotatably disposed in the placement groove 230. Specifically, the handle 240 is provided with a rotating rod on both sides thereof, and the rotating rod is rotatably connected with the housing cover 200, that is, the handle 240 is rotatably connected, so that when the whole housing 100 needs to be moved, only the handle 240 needs to be lifted.
As described above, the above embodiments are not limiting embodiments of the present invention, and modifications or equivalent variations made by those skilled in the art based on the substance of the present invention are within the technical scope of the present invention.
Claims (5)
1. A high-current lithium battery protection board is characterized by comprising: the protection plate comprises a protection plate body, a shell and a shell cover;
the inner part of the shell is provided with a cavity, a circle of positioning block is sleeved on the outer side of the shell, a plurality of through holes are formed in the positioning block, a plurality of grids are arranged at the bottom of the cavity, a plurality of protruding blocks are arranged on the side wall of the cavity and correspond to the protruding blocks, a plurality of fixing columns are further arranged at two ends of the bottom of the cavity, and the fixing columns are arranged at intervals;
the shell cover is provided with a display screen, a first groove and a second groove are formed in the shell cover, a first wiring terminal is arranged in the first groove, a second wiring terminal is arranged in the second groove, and the first wiring terminal and the second wiring terminal are electrically connected with the display screen through wires;
the protection plate body is arranged in the cavity;
the protective plate body is electrically connected with the protective plate body;
the protection plate body is electrically connected with the battery pack.
2. A high current lithium battery protection plate as claimed in claim 1, wherein: each fixing column is arranged above one grid.
3. A high current lithium battery protection plate as claimed in claim 1, wherein: still include the thermodetector, the thermodetector with protection shield body electricity signal connection.
4. A high current lithium battery protection plate as claimed in claim 3, wherein: the LED lamp also comprises a current-limiting resistor and a diode, wherein one end of the current-limiting resistor is connected with the diode in series, and the other end of the current-limiting resistor is used for being connected with an external power supply.
5. A high current lithium battery protection plate as claimed in claim 1, wherein: the shell cover is further provided with a placing groove, a handle is arranged on the shell cover, the handle is connected with the shell cover in a rotating mode, and the handle is arranged in the placing groove in a rotating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020091891.7U CN211405459U (en) | 2020-01-16 | 2020-01-16 | Lithium battery protection board with high current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020091891.7U CN211405459U (en) | 2020-01-16 | 2020-01-16 | Lithium battery protection board with high current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211405459U true CN211405459U (en) | 2020-09-01 |
Family
ID=72211483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020091891.7U Active CN211405459U (en) | 2020-01-16 | 2020-01-16 | Lithium battery protection board with high current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211405459U (en) |
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2020
- 2020-01-16 CN CN202020091891.7U patent/CN211405459U/en active Active
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