CN218161896U

CN218161896U - Lithium battery charging and discharging protection device

Info

Publication number: CN218161896U
Application number: CN202222593994.5U
Authority: CN
Inventors: 陈冬冬; 李龙; 商虹
Original assignee: Foshan Guli Neng Power Technology Co ltd
Current assignee: Foshan Guli Neng Power Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-09-29
Publication date: 2022-12-27
Anticipated expiration: 2032-09-29

Abstract

The utility model relates to a lithium battery technology field especially relates to a lithium cell measurement protection device, including group battery, fuse, protection shield, relay and external port, the group battery passes through fuse and relay and establishes ties each other and links to each other with external port, just the group battery both ends are still parallel connection has the protection shield, the protection shield output links to each other with the relay. The utility model discloses can control battery charge and discharge break-make through the relay break-make, to the ability of overflowing more than the heavy current 200A, with MOS break-make output voltage, for 12V or 24V voltage signal of relay, control whole circuit charge and discharge break-make, the utility model is suitable for a test heavy current charge and discharge protection device can remodel according to the different electric currents size, easy dismounting, convenient test.

Description

Lithium battery charging and discharging protection device

Technical Field

The utility model relates to a lithium cell technical field especially relates to a lithium cell measurement protection device.

Background

At present, the starting battery of the fuel automobile on the market is basically 12V or 24V lead-acid storage battery, and the capacity is 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.

Lithium cell group protection shield MOS scheme, it is restricted to overflow, generally within 150A best restriction, for example the little power family of group battery stores up and uses the MOS scheme, but if will test, need have the requirement to the electric current, the MOS scheme is very ripe for the undercurrent, the MOS scheme is used to the heavy current, the temperature rise is very high, MOS can be burnt out, is applicable to the scene of undercurrent. However, the model change and the large current are difficult at present, the test cannot be met, the cost is reduced in consideration of equipment, in the prior art, a large-current charging and discharging protection device is not available for the moment, but the corresponding equipment cost is high, a novel battery pack charging and discharging protection device which can be changed according to different current sizes is needed, and the problems can be solved.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lithium cell charge and discharge protection device carries out technical transformation through carrying out current battery charge and discharge protection device, has solved the problem that current charge protection device can't just carry out the use to the heavy current scene.

In order to solve the technical problem, the utility model discloses specifically adopt following technical scheme:

the utility model provides a lithium cell charge-discharge protection device, includes group battery, fuse, protection shield, relay and external port, and the group battery passes through fuse and relay and establishes ties each other and link to each other with external port, just group battery both ends are still parallel connection with the protection shield, the protection shield output links to each other with the relay, and the anodal and external port of group battery are anodal to be connected, and the group battery negative pole links to each other with external port negative pole.

Preferably, the relay is a total positive relay, and the total positive relay is connected with the positive electrode of the battery pack.

Preferably, a battery voltage detection module is further arranged on the protection plate, and the battery voltage detection module is electrically connected with the protection plate.

Preferably, a battery temperature detection module is further arranged on the protection plate, and the battery temperature detection module is electrically connected with the protection plate.

Preferably, a voltage reduction module is arranged between the protection board and the main positive relay, the output end of the protection board is connected with the input end of the voltage reduction module, and the output end of the voltage reduction module is connected with the input end of the relay.

Compared with the prior art, the utility model discloses following beneficial effect has:

when the protection plate body is connected with a load to discharge, the low level is output by the protection plate body, the relay does not act, the positive electrode of the battery pack is output through the normally closed point of the relay to supply power to the load, when the situation that the battery in the battery pack is detected to be over-discharged, namely, the voltage is lower than the under-voltage threshold value, the high level is output by the protection plate body, the coil in the relay is electrified, and the normally closed point is switched off to enter a protection state.

The utility model provides a to group battery charge-discharge protection device can control battery charge-discharge break-make through the relay break-make, to the ability of overflowing more than the heavy current 200A, with MOS break-make output voltage, give a voltage signal of relay, control whole circuit charge-discharge break-make, can be used for testing heavy current battery electricity core connection piece connector temperature rise to and fill fast multiplying power performance, can test 200A 300A 400A heavy current testing arrangement soon.

The utility model discloses a heavy current charge-discharge protection device, the battery basic performance of convenient test heavy current, simple and convenient realization is easy, is feasible to heavy current charge-discharge protection device, has improved efficiency of software testing to and break through the bottleneck of the mode method of heavy current test.

The utility model discloses the device is applicable to test heavy current charge-discharge protection device, can remodel according to the size of different electric currents, easy dismounting, convenient test.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention;

description of reference numerals: the device comprises a battery pack 1, a fuse 2, a protection plate 3, an output anode 31, an output cathode 32, a relay 4, an external port 5 and a voltage reduction module 6.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings and examples.

As shown in fig. 1, this embodiment provides a lithium battery charge-discharge protection device, including group battery 1, fuse 2, protection shield 3, relay 4 and external port 5, group battery 1 is established ties each other through fuse 2 and relay 4 and is linked to each other with external port 5, just 1 both ends of group battery are the parallel connection protection shield 3 still, 3 outputs of protection shield link to each other with relay 4. The positive pole of the battery pack 1 is connected with the positive pole of the external port 5, and the negative pole of the battery pack 1 is connected with the negative pole of the external port 5.

Further, the relay 4 is a total positive relay, and the total positive relay is connected with the positive electrode of the battery pack 1.

Further, in order to realize that the protection board 3 can detect the discharge voltage of the battery pack 1, a battery voltage detection module is further disposed on the protection board 3, and the battery voltage detection module is electrically connected to the protection board 3.

Further, in order to detect the temperature of the battery pack 1, a battery temperature detection module is further arranged on the protection plate 3, and the battery temperature detection module is electrically connected with the protection plate 3.

Further, be provided with step-down module 6 between protection shield 3 and the total positive relay 4, the output of protection shield 3 links to each other with step-down module 6 input, and step-down module 6 output links to each other with relay 4 input. The protection board 3 is respectively connected with the voltage reduction module 6 through an output anode 31 and an output cathode 32, and the voltage reduction module 6 is respectively connected with the anode and the cathode of the relay 4.

The voltage reduction module has the functions of:

the input range of the voltage reduction module meets the working range of the battery pack, for example, the nominal voltage of the 20-string ternary battery pack is 73V, and the working range is as follows: 56-84V (under pressure of-2.8V and over pressure of-4.2V for the protection plate monomer).

The working principle of the voltage reduction module is as follows: the group battery passes through the protection shield output, inserts the output with the step-down module again, and the power supply is given for the relay to the step-down module output, and steerable relay is closed and the disconnection.

During charge and discharge, the protection board detects that the voltage of the single battery reaches an overvoltage or undervoltage protection threshold value, the protection is closed to output, the input and the output of the voltage reduction module are equivalently cut off, and the relay is controlled to be disconnected.

This embodiment can carry out the test of heavy current battery temperature rise, and terminal connecting row temperature rise test and battery high magnification test. The embodiment is suitable for testing the large-current performance.

The embodiment provides a to group battery charge-discharge protection device, can control battery charge-discharge break-make through the relay break-make, to overcurrent capacity more than heavy current 200A, with MOS break-make output voltage, give a voltage signal of relay, control whole circuit charge-discharge break-make, can be used for testing heavy current battery electricity core connection piece connector temperature rise to and fill soon and put multiplying power performance, can test 200A 300A 400A heavy current testing arrangement. The embodiment realizes the large-current charging and discharging protection device, is convenient to test the basic performance of the large-current battery, is simple and convenient to realize, is feasible aiming at the large-current charging and discharging protection device, improves the testing efficiency and breaks through the bottleneck of a large-current testing mode method. The device is suitable for testing a large-current charging and discharging protection device, can be remodeled according to different current sizes, and is convenient to disassemble and assemble and test.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

The utility model discloses the standard part that uses all can purchase from the market, and dysmorphism piece all can be customized according to the description with the record of drawing of description, and the concrete connection mode of each part all adopts conventional means such as ripe bolt, rivet, welding among the prior art, and machinery, part and equipment all adopt conventional model among the prior art, and conventional connection mode among the circuit connection adoption prior art is not detailed here again.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or through an intermediary, either internal or external to the two elements or in an interactive relationship between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

Claims

1. The utility model provides a lithium cell measurement protection device which characterized in that, includes group battery, fuse, protection shield, relay and external port, and the group battery passes through fuse and relay and establishes ties each other and link to each other with external port, just the group battery both ends are the parallel connection protection shield still, the protection shield output links to each other with the relay, and the group battery is anodal to link to each other with external port is anodal, and the group battery negative pole links to each other with external port negative pole.

2. The lithium battery charging and discharging protection device as claimed in claim 1, wherein the relay is a master positive relay, and the master positive relay is connected with the positive electrode of the battery pack.

3. The lithium battery charging and discharging protection device as claimed in claim 1, wherein a battery voltage detection module is further disposed on the protection plate, and the battery voltage detection module is electrically connected to the protection plate.

4. The lithium battery charging and discharging protection device as claimed in claim 1, wherein a battery temperature detection module is further disposed on the protection plate, and the battery temperature detection module is electrically connected to the protection plate.

5. The lithium battery charging and discharging protection device as claimed in claim 1, wherein a voltage reduction module is disposed between the protection board and the main positive relay, an output end of the protection board is connected to an input end of the voltage reduction module, and an output end of the voltage reduction module is connected to an input end of the relay.