CN112271784A

CN112271784A - Multi-box parallel SOC balance control system of explosion-proof lithium battery power supply device

Info

Publication number: CN112271784A
Application number: CN202011207326.3A
Authority: CN
Inventors: 王连明
Original assignee: Anhui Joyo Electric Co ltd
Current assignee: Anhui Joyo Electric Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-01-26

Abstract

The invention discloses an anti-explosion lithium battery power supply device multi-box parallel SOC balance control system which comprises a first battery box, a second battery box, a third battery box and a fourth battery box, wherein the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box are fixedly connected with a hand-held rod, the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box are provided with heat dissipation holes, and the positive electrode of a battery acquisition and management system BMS is electrically connected with a bus current sensor CT. This explosion-proof lithium battery power supply unit many casees SOC balanced control system that connects in parallel, through field bus CAN's setting, before battery system charges, each battery box battery is gathered and SOC balanced degree between management system BMS automatic detection case, mends the electricity to detecting out the unbalanced battery box, carries out the quick electricity of meneing to the group battery through the electronic control mode and maintains, has avoided the manual maintenance operation, has improved maintenance efficiency.

Description

Multi-box parallel SOC balance control system of explosion-proof lithium battery power supply device

Technical Field

The invention relates to the technical field of lithium batteries, in particular to a multi-box parallel SOC balance control system of an explosion-proof lithium battery power supply device.

Background

A lithium battery is a type of battery using a nonaqueous electrolyte solution, using lithium metal or a lithium alloy as a positive/negative electrode material. Lithium ion batteries have been proposed and have begun to be studied. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. With the development of scientific technology, lithium batteries have become mainstream, and the lithium batteries can be roughly divided into two types: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain lithium in the metallic state and are rechargeable. The rechargeable fifth generation product lithium metal battery has better safety, specific capacity, self-discharge rate and cost performance than the lithium ion battery. Due to its own high technical requirement limits, only a few countries of companies are producing such lithium metal batteries.

State of charge (SOC) refers to the percentage of available capacity that can be released in a current battery under specified discharge conditions. The percentage of the SOC state range is generally from 0% to 100%, and in the field of electric automobiles, in order to increase the endurance mileage, the total energy of a battery system is increased by combining a plurality of battery boxes in series and in parallel is a common scheme. When multiple battery boxes operate in series-parallel connection, due to the fact that the battery internal resistance, the self-discharge capacity and the energy consumption of an internal electrical system of each battery box are inconsistent, the difference of operating temperature intervals and other characteristics, after the battery boxes operate for a long time, the SOC values of different battery box systems can be different, the overall performance of the battery systems is affected, the multiple battery box series-parallel connection system on the market does not have inter-box balance measures, when the SOC of one battery box is unbalanced, generally, manual balance maintenance of a box disassembling cover is carried out, and low efficiency and trouble are wasted.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a multi-box parallel SOC balance control system of an explosion-proof lithium battery power supply device, which solves the problems that generally, when the SOC of a battery box is unbalanced, a box cover is detached, manual balance maintenance is carried out, and low efficiency and trouble are caused.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: an anti-explosion lithium battery power supply device multi-box parallel SOC balance control system comprises a first battery box, a second battery box, a third battery box and a fourth battery box, wherein the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box are fixedly connected with a hand-held lever, the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box are provided with heat dissipation holes, the bottoms of the inner walls of the first battery box, the second battery box, the third battery box and the fourth battery box are fixedly connected with a battery collection and management system BMS, the positive electrode of the battery collection and management system BMS is electrically connected with a bus current sensor CT, one positive end of the bus current sensor CT is electrically connected with a charge and discharge control relay K1, the other positive end of the bus current sensor CT is electrically connected with a battery system total positive P1, the positive electrode of the charge and discharge relay K1 is electrically connected with a battery pack, the positive pole electric connection of total positive P1 of battery system has control relay K2, control relay K2's negative pole electric connection has fuse FU1, fuse FU 1's negative pole electric connection has total negative N of battery system.

Preferably, the negative electrode of the battery collection and management system BMS is electrically connected with the negative electrode of the battery pack and the negative electrode of the total negative N of the battery system, and the surface material of the battery collection and management system BMS is waterproof.

Preferably, a data terminal of the fieldbus CAN is electrically connected with a data terminal of the battery acquisition and management system BMS, and a medium of the fieldbus CAN is an optical fiber.

Preferably, the negative electrode of the fuse FU1 is electrically connected with one end of the total negative N of the battery system, and the fuse is a tube fuse.

Preferably, the number of the battery collection and management systems BMS is set to be plural, and the plural battery collection and management systems BMS are connected in parallel to the field bus CAN.

Preferably, the output end of the battery system total negative N is electrically connected with the input end of the battery system total positive P1 of the second battery box.

Preferably, the main body material of the portable rod is aluminum alloy, and the surface of the portable rod is sleeved with heat insulation rubber.

Preferably, the surface of the heat dissipation hole is provided with a metal mesh.

(III) advantageous effects

The invention provides a multi-box parallel SOC balance control system of an explosion-proof lithium battery power supply device. Compared with the prior art, the method has the following beneficial effects:

(1) the multi-box parallel SOC balance control system of the anti-explosion lithium battery power supply device is characterized in that a bus current sensor CT is electrically connected with the positive electrode of a battery acquisition and management system BMS, the negative electrode of a fuse FU1 is electrically connected with the total negative N of the battery system, the data end of the battery acquisition and management system BMS is electrically connected with the data end of a field bus CAN, the medium of the field bus CAN is optical fiber, the number of the battery acquisition and management system BMS is multiple, the battery acquisition and management system BMS is connected with the field bus CAN in parallel, and the system CAN specifically analyze the running condition of each battery box through the combined arrangement of the field bus CAN and the bus current sensor CT, so that the inter-box SOC balance control circuit does not act when a single box of the battery system runs; when the battery system is put into series-parallel connection and common operation of a plurality of battery boxes, the inter-box battery collection and management system BMS judges the series-parallel connection relation of the system according to current data detected by a bus current sensor CT, then before the battery system is charged, the inter-box SOC balance degree is automatically detected by each battery box battery collection and management system BMS, the battery boxes with the detected unbalance are subjected to power compensation, the battery pack is subjected to quick power compensation maintenance in an electronic control mode, manual maintenance operation is avoided, and maintenance efficiency is improved.

(2) This anti-explosion lithium battery power supply unit SOC balanced control system that connects in parallel of many casees, through first battery box, the second battery box, the bottom fixedly connected with battery collection and management system BMS of third battery box and fourth battery box inner wall, through the setting of battery collection and management system BMS, during charging, when battery collection and management system BMS detected that a certain or several battery box SOC unbalance reaches predetermined threshold, will mend the electricity to it alone one by one, in order to reach the abundant equilibrium of SOC of all battery boxes in the system, close balanced control circuit at last, start system charging bus control circuit, in order to realize that all battery boxes are full of simultaneously in the system, the management system who adopts intelligence can improve maintenance efficiency by a wide margin, shorten maintenance time.

(3) The anti-explosion lithium battery power supply device multi-box parallel SOC balance control system is characterized in that a portable rod is fixedly connected to the surfaces of a first battery box, a second battery box, a third battery box and a fourth battery box, heat dissipation holes are formed in the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box, one positive electrode of a bus current sensor CT is electrically connected with a charge-discharge control relay K1, the other positive electrode of the bus current sensor CT is electrically connected with a battery system total positive P1, the positive electrode of the charge-discharge control relay K1 is electrically connected with a battery pack, the positive electrode of the battery system total positive P1 is electrically connected with a control relay K2, the portable rod is made of aluminum alloy, heat insulation rubber is sleeved on the surface of the portable rod, a metal mesh is arranged on the surface of the heat dissipation holes, and when a worker maintains a battery in the battery boxes, can be fast convenient remove the battery box to suitable position, the operation of being convenient for, and through the setting of louvre, can be timely with the battery box inside battery in time dispersing away at the heat that the during operation is collected, great improvement the radiating efficiency of battery combination, and the structure is fairly simple, easy to maintain, simultaneously through the joint setting of charge and discharge control relay K1 and control relay K2, make things convenient for the inside operation of mutually supporting of system, and operating logic is clear, easy long-term quick maintenance.

Drawings

FIG. 1 is a circuit diagram of the present invention;

FIG. 2 is a schematic diagram of the structure wiring of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, an embodiment of the present invention provides a technical solution: a multi-box parallel SOC balance control system of an explosion-proof lithium battery power supply device comprises a first battery box, a second battery box, a third battery box and a fourth battery box, wherein the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box are fixedly connected with a hand-held lever, the surfaces of the first battery box, the second battery box, the third battery box and the fourth battery box are provided with heat dissipation holes, through the arrangement of the hand-held lever on the surface of the battery box, a worker can quickly and conveniently move the battery boxes to a proper position when maintaining batteries in the battery boxes, the operation is convenient, through the arrangement of the heat dissipation holes, heat accumulated in the batteries in the battery boxes during working can be timely dissipated, the heat dissipation efficiency of a battery combination is greatly improved, the structure is quite simple, the maintenance is easy, and meanwhile, through the combined arrangement of a charge and discharge control relay K1 and a control relay K2, the internal cooperation operation of the system is facilitated, the operation logic is clear, and the long-term and quick maintenance is easy.

The bottom of the inner wall of each of the first battery box, the second battery box, the third battery box and the fourth battery box is fixedly connected with a battery acquisition and management system BMS, the anode of the battery acquisition and management system BMS is electrically connected with a bus current sensor CT, and the system CAN specifically analyze the running condition of each battery box through the joint arrangement of a field bus CAN and the bus current sensor CT, so that the inter-box SOC balance control circuit does not act when a single battery box of the battery system runs; when the battery system is put into series-parallel connection and common operation of a plurality of battery boxes, the inter-box battery collection and management system BMS judges the series-parallel connection relation of the system according to current data detected by a bus current sensor CT, then before the battery system is charged, the inter-box SOC balance degree is automatically detected by each battery box battery collection and management system BMS, the battery boxes with the detected unbalance are subjected to power compensation, the battery pack is subjected to quick power compensation maintenance in an electronic control mode, manual maintenance operation is avoided, and maintenance efficiency is improved.

One end of the positive pole of the bus current sensor CT is electrically connected with a charge-discharge control relay K1, the other end of the positive pole of the bus current sensor CT is electrically connected with a battery system total positive P1, the positive pole of the charge-discharge control relay K1 is electrically connected with a battery pack, the positive pole of the battery system total positive P1 is electrically connected with a control relay K2, the negative pole of the control relay K2 is electrically connected with a fuse FU1, the negative pole of the fuse FU1 is electrically connected with a battery system total negative N, the negative pole of the battery acquisition and management system BMS is electrically connected with the negative pole of the battery pack and the negative pole of the battery system total negative N, the data end of the battery acquisition and management system BMS is electrically connected with the data end of a field bus CAN, the negative pole of the fuse FU1 is electrically connected with one end of the battery system total negative N, and when a, the battery box CAN be quickly and conveniently moved to a proper position, the operation is convenient, in addition, the heat accumulated in the battery box during the work CAN be timely dissipated out through the arrangement of the heat dissipation holes, the heat dissipation efficiency of the battery combination is greatly improved, in addition, the structure is quite simple, the maintenance is easy, meanwhile, the mutual matching operation in the system is convenient through the combined arrangement of the charging and discharging control relay K1 and the control relay K2, the operation logic is clear, the long-term quick maintenance is easy, the number of the battery collection and management systems BMS is set to be multiple, the multiple battery collection and management systems BMS are connected with the field bus CAN in parallel, the output end of the battery suction total negative N is electrically connected with the input end of the battery system total positive P1 of the second battery box, the surface material of the battery collection and management system BMS is waterproof, the medium of the field bus CAN is optical fiber, the fuse is a, the main body material of portable pole is the aluminum alloy, and the surface cover is equipped with thermal-insulated rubber, and the surface of louvre is provided with the metal mesh.

When the SOC of the first battery box is detected to be unbalanced, the first battery box needs to be supplemented with power. At the moment, a control relay K2 of a battery acquisition and management system BMS scheduling control B2 box between boxes is closed, a charging and discharging control relay K1 of a first battery box is closed, then the battery acquisition and management system BMS of the first battery box requests balanced current estimated through a strategy, and after an external charger responds, the balanced current forms a balanced power supply loop through a total positive P1 of the battery system, a charging and discharging control relay K1 of the first battery box, a control relay K2 and a fuse FU1 of a second battery box and a total negative N of the battery system, so that balanced power supply of the first battery box is realized. After the electricity supplement reaches a preset value, the inter-box battery collection and management system BMS requests the external charger to stop, and then the control relay K2 of the B2 box and the charging and discharging control relay K1 of the first battery box are disconnected respectively. If the inter-box battery acquisition and management system BMS detects that other battery boxes have SOC imbalance, SOC balance power supplement is carried out according to the same control principle until the SOC balance degrees of all the battery boxes reach a preset value. When the SOC balance degrees of all battery boxes in the battery system meet the system charging requirement, the bus-level system is formally started to charge so as to ensure that each battery box in the battery system can be normally fully charged

And those not described in detail in this specification are well within the skill of those in the art.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an explosion-proof lithium cell power supply unit multi-box SOC balanced control system that connects in parallel, includes first battery box, second battery box, third battery box and fourth battery box, its characterized in that: the surface of the first battery box, the surface of the second battery box, the surface of the third battery box and the surface of the fourth battery box are fixedly connected with a hand-held lever, the surfaces of the first battery box, the second battery box, the surface of the third battery box and the surface of the fourth battery box are provided with heat dissipation holes, the bottoms of the inner walls of the first battery box, the second battery box, the third battery box and the fourth battery box are fixedly connected with a battery acquisition and management system BMS, the positive electrode of the battery acquisition and management system BMS is electrically connected with a bus current sensor CT, one end of the positive electrode of the bus current sensor CT is electrically connected with a charge and discharge control relay K1, the other end of the positive electrode of the bus current sensor CT is electrically connected with a battery system total positive P1, the positive electrode of the charge and discharge control relay K1 is electrically connected with a battery pack, the positive electrode of the battery system total positive P1 is electrically connected with a control relay K2, the negative, the negative pole electric connection of fuse FU1 has the total negative N of battery system.

2. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: the negative pole of battery collection and management system BMS and the negative pole of group battery and the total negative N's of battery system negative pole electric connection, the surface material of battery collection and management system BMS is waterproof.

3. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: the data terminal of the battery acquisition and management system BMS is electrically connected with the data terminal of the field bus CAN, and the medium of the field bus CAN is optical fiber.

4. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: fuse FU 1's negative pole and the total one end electric connection who negatively loads N of battery system, the fuse is the tubular fuse.

5. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: the number of the battery acquisition and management systems BMS is set to be a plurality of, and the plurality of battery acquisition and management systems BMS are connected with the field bus CAN in parallel.

6. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: the output end of the battery system total negative N is electrically connected with the input end of the battery system total positive P1 of the second battery box.

7. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: the main body material of portable pole is the aluminum alloy, and the surface cover is equipped with thermal-insulated rubber.

8. The multi-box parallel SOC balance control system of the power supply device of the explosion-proof lithium battery as claimed in claim 1, characterized in that: and a metal net is arranged on the surface of the heat dissipation hole.