CN103904372A - Capacity grading cabinet for groups of lithium batteries - Google Patents

Abstract

The invention discloses a lithium battery group storage cabinet, which includes: a clamping device for a group of batteries, a charging and discharging device, and a charging and discharging circuit for the battery, which is used to connect to a power supply device and an energy recovery device. The power supply device is externally connected to the mains power grid, and converts the AC mains power into a low-voltage direct current for the charging and discharging device to charge each single battery in the clamping device, and the energy recovery device is used to convert each single battery in the charging and discharging device The discharge voltage of the single battery is raised and converted into alternating current and returned to the mains grid or local area grid; the test control board is used to detect and control the charging and discharging status of each single battery, and record the charging, The magnitude and time of the discharge current. Compared with the existing technology, it has the following advantages: 1) It can realize high-current charging and discharging, shortening the battery capacity division cycle; 2) High assembly efficiency; 3) Electric energy recycling, energy saving; 4) During the capacity division process, also Can measure the internal resistance of the battery.

Description

Lithium battery component container

【Technical field】

The invention relates to the field of new energy technology, in particular to a lithium battery component container.

【Background technique】

As an important part of the new energy field, lithium-ion batteries have made great progress by virtue of their advantages of light weight, high specific energy, high working voltage, long life, and low self-discharge, and are rapidly used in various modern mobile communications devices and portable electronic devices. With the intensification of the energy crisis, all countries are looking for the most suitable substitutes for automobile energy. Lithium-ion batteries have gradually become the preferred new energy for various automobile manufacturers due to their above-mentioned advantages.

It has been found in practice that the capacities of single batteries produced in batches under the same process conditions are different, even very different. If these single cells with different capacities are not distinguished and are used directly in series and parallel, then in the process of charging and discharging, some of the single cells will often be overcharged, and some of the single cells will not be saturated, which will seriously affect the battery capacity. The lifespan of the body battery has also buried a hidden danger to the stability of the entire power supply system. It can be seen that it is very important to divide the processed single battery into capacity.

The existing sub-container cabinets mainly have the following two deficiencies: 1) The single cells are manually clamped between the probes equipped with elastomers, which is inefficient, and the pressure of the elastomers is inconsistent, which affects charging and discharging Effect; 2) In the process of battery capacity division, it is necessary to repeatedly charge and discharge each single battery several times. The current traditional process is to convert the energy discharged by each single battery into heat energy and consume it, wasting energy and causing The ambient temperature rises.

In view of the above disadvantages, it is necessary to provide an improved lithium battery component container to overcome the above disadvantages.

【Content of invention】

The invention provides a lithium battery group container with simple structure, low manufacturing cost, high capacity separation efficiency, effective energy utilization and cost saving.

In order to achieve the above object, the present invention adopts the following technical solutions: a lithium battery component storage cabinet, which includes:

The clamping device for the battery pack is provided with probes for connecting the positive and negative electrodes of each single battery, respectively extending outward from the positive and negative electrode probes to connect to the first wire of the charging and discharging device;

The charging and discharging device is equipped with a battery charging and discharging circuit, which is used to connect to the power supply device and the energy recovery device;

The power supply device is externally connected to the mains power grid, and converts the AC mains power into low-voltage direct current for the charging and discharging device to charge each single battery in the clamping device;

The energy recovery device is used to increase the discharge voltage of each single battery in the charging and discharging device and convert it into alternating current and return it to the mains grid or local area grid;

The test control board is used to detect and control the charging and discharging status of each single battery, and record the magnitude and time of charging and discharging current of each single battery.

As an improvement of the lithium battery group storage cabinet of the present invention, the clamping device for the group of batteries includes a base, an upper pressing plate, a lower supporting plate, and a guide rod extending upward from the base and penetrating through the lower supporting plate, and the upper pressing plate There is an air cylinder driving device between the bottom pallet and the bottom pallet, the guide rod between the bottom pallet and the base is provided with a spring, and the upper plate and the lower pallet are respectively provided with an upper needle plate and a lower needle plate on the opposite surface. There is also a battery storage box on the board.

As an improvement of the lithium battery component storage cabinet of the present invention, the energy recovery device includes a BOOST booster circuit and an inverter circuit.

As an improvement of the lithium battery component storage cabinet of the present invention, the test control board can set the highest charging voltage and the lowest discharging voltage of each single battery, and monitor the real-time voltage of each single battery to control the charging voltage of each single battery. The opening and closing of charging and discharging of each single battery.

As an improvement of the lithium battery group storage cabinet of the present invention, the sub-container cabinet also includes a storage frame that can be layered, and each storage frame is equipped with a clamping device for the battery group.

As an improvement of the lithium battery component storage cabinet of the present invention, the power supply device converts AC mains power into 12V DC power.

As an improvement of the lithium battery component container of the present invention, the lithium battery component container is also equipped with an electric control box, and the charging and discharging device, power supply device, energy recovery device and test control board are housed in the electric control box. Inside the control box.

As an improvement of the lithium battery component storage cabinet of the present invention, the upper needle board and the lower needle board have the same structure, and a number of probes arranged in a matrix are arranged on them.

As an improvement of the lithium battery component storage cabinet of the present invention, the charging and discharging current of the charging and discharging device is 20A-30A.

As an improvement of the lithium battery component container of the present invention, the lithium battery component container also includes a battery internal resistance detection unit, which can simultaneously detect The internal resistance of the battery is recorded in the test control board.

Compared with the prior art, the present invention has the following advantages:

1) It can realize high-current charge and discharge, shortening the capacity division cycle of the battery;

2) The single battery is placed in the whole box for test and capacity analysis, and the assembly efficiency is high;

3) Electric energy recycling, energy saving, and can ensure that the ambient temperature does not rise, ensuring the accuracy of capacity division;

4) In the process of dividing the capacity, the internal resistance of the battery can also be measured.

【Description of drawings】

In the following, the lithium battery component storage cabinet and its beneficial technical effects of the present invention will be described in detail in conjunction with the accompanying drawings and specific embodiments.

Accompanying drawing 1 is the perspective view of the overall structure of the lithium battery component container of the present invention;

Accompanying drawing 2 is the perspective view of the clamping device of part A of the lithium battery component container of the present invention;

Accompanying drawing 3 is an exploded view of the partial structure of the clamping device of the lithium battery component container of the present invention;

Accompanying drawing 4 is the schematic structural diagram of the lithium battery component container of the present invention;

Accompanying drawing 5 is the main circuit diagram of the internal resistance detection unit of the lithium battery group container of the present invention.

【Detailed ways】

Please refer to FIG. 1 to FIG. 5, a lithium battery group container 100 according to the present invention, which includes: a clamping device 10 for group batteries, provided with probes for docking the positive and negative electrodes of each single battery, Respectively extend outward from the positive and negative probes and connect to the first wire of the charging and discharging device; the charging and discharging device 20 is provided with a battery charging and discharging circuit inside, which is used to connect to the power supply device and the energy recovery device, the power supply device 30. The power supply unit is externally connected to the mains power grid, and the AC mains power is converted into low-voltage direct current for the charging and discharging device to charge each single battery in the clamping device. The energy recovery device 40 is used to convert each single battery in the charging and discharging device The discharge voltage of the single battery is raised and converted into alternating current and returned to the mains grid or local area grid; the test control board 50 is used to detect and control the charging and discharging status of each single battery, and record the charging of each single battery , the size and time of the discharge current.

The clamping device 10 for a battery pack includes a base 11 , an upper pressing plate 12 , a lower supporting plate 13 , an upper and lower needle plate ( 14 , 15 ), a cylinder driving device 16 , a guide rod 17 , a spring 18 and a battery storage box 60 . Wherein, the structure of the base 11, the upper pressing plate 12 and the lower supporting plate 13 is basically the same, all of which are in the shape of a rectangular sheet. Plate 13, the bottom layer is the base 11, and the cylinder driving device 16 is installed between the upper pressing plate 12 and the lower supporting plate 13, and the cylinder driving device 16 includes a cylinder push rod, which is connected to a top plate 161 on the cylinder push rod. Both ends of the top plate 161 are also provided with through holes 162, the aforementioned guide rods 17 are installed in the through holes 162, after extending through the lower supporting plate 13, and finally fixedly installed on the base 11, between the lower supporting plate 13 and the base A spring 18 is sheathed on the guide rod 17 between 11 . The aforesaid top plate 161 is fixedly connected to the upper pressing plate 12, so that when the cylinder push rod shrinks, the distance between the lower supporting plate 13 and the base 11 can remain basically unchanged due to the elastic force of the spring 18, but the upper pressing plate 12 will be on the top. Under the pulling force of rod contraction, downward supporting plate 13 direction moves. An upper needle plate 14 and a lower needle plate 15 are respectively provided on the opposite surfaces of the upper pressing plate 12 and the lower supporting plate 13. The upper needle plate 14 and the lower needle plate 15 have the same structure, and there are several needle plates arranged in a matrix on it. the probe. A battery storage box 60 is also placed on the lower needle plate, and the battery storage box 60 is used to accommodate each single battery 70 and ensure that the positive and negative poles of the single battery 70 correspond to the probes on the upper and lower needle plates.

The charging and discharging circuits adopted in the charging and discharging device 20 of the present invention are all DC constant current circuits, which can also realize the high current charging and discharging effect of 20A-30A.

The power supply device 30 is externally connected to the mains power grid, and converts the AC mains power into 12V low-voltage direct current for the charge and discharge device to charge each single battery in the clamping device. The power supply device 30 can choose some common power converters .

The energy recovery device 40 includes a BOOST booster circuit and an inverter circuit. In the present invention, since the voltage of the single battery 70 is relatively small, the single battery 70 can be boosted multiple times. Preferably, the single battery 70 is first boosted. The battery is boosted to 12V, and then boosted to 60V, and then, combined with the inverter circuit, it is boosted to AC 220V again.

A lithium battery group storage cabinet 100 of the present invention also includes a layered storage frame 80, each layer of storage frame 80 is equipped with the clamping device 10 of the battery group; There is an electric control box 90, and the aforementioned charging and discharging device 20, power supply device 30, energy recovery device 40 and test control board 50 are accommodated in the electric control box. In order to facilitate the maintenance of the sub-container, the fragile electronic components in the equipment can be made into several unit modules, for example, the test control board is assembled from several small test control boards.

A lithium battery component storage cabinet 100 of the present invention works as follows: firstly put the single battery 70 to be divided into the battery storage box 60, and keep the single battery 70 to be placed upright, and then place the single battery in the whole box The single battery is placed in the clamping device 10 of the battery pack on each storage frame of the storage cabinet 100, specifically, the whole box of single batteries is placed on the lower needle plate of the battery pack clamping device 10 15, and ensure that the probes on the lower needle plate 15 are in one-to-one correspondence with the terminals below the single battery 70. In the capacity separation process, first, the capacity separation cabinet 100 will charge each single battery 70 in the battery storage box 60, that is, start the cylinder driving device 16 of the group battery holding device 10, and the effect of the cylinder driving device 16 Next, the upper needle plate 14 will move towards the downward needle plate 15 until the probes on the upper needle plate 14 respectively abut against the other end of the battery to be divided, and then the power supply unit 30 converts the commercial power into 12V direct current and charge each single battery 70 through the charging and discharging device 20. During this process, the test control board 50 can control the charging state of each single battery according to the preset highest charging voltage of each single battery 70, so The test control board 50 can also record the size of the charging current and the length of the charging time. Then, during the discharge process, the test control board 50 can control the discharge state of the single battery according to the preset minimum discharge voltage of each single battery. , the test control board 50 can also record the size of the discharge current and the length of the discharge time. According to Q=IT, the capacity of the single battery can be known according to the difference in charge and discharge. In the actual capacity division process , the single battery 70 will be repeatedly charged and discharged and a plurality of difference values will be measured in order to ensure high accuracy of the capacity of the single battery. The above-mentioned multiple differences will be recorded in the chip of the test control board 50, and then the capacity of each battery is finally determined according to a certain calculation method (for example, calculating the average value), and the size of the capacity is compared with that of each single battery in the battery. The positional relationship in the box is correspondingly stored in the chip of the test control board 50, and then the user can operate the control screen of the device, and the capacity and position information of each single battery will be displayed on the control screen. During the aforementioned discharge process, each single battery will recycle the electric energy in the single battery to the municipal power grid or local power grid through the BOOST booster circuit and the inverter circuit. After charging and discharging, when the cylinder driving device 16 drives the cylinder push rod, the upper pressing plate 12 will be held up, so that the upper pressing plate 12 is returned to the initial position.

The lithium battery group container also includes a battery internal resistance detection unit, which can simultaneously detect the internal resistance of the battery and record it in the chip of the test control board 50 when the single battery is separated. Please refer to Figure 5 for the main circuit diagram of the internal resistance detection unit.

A lithium battery component storage cabinet of the present invention is not limited to the description in the specification and the implementation, so those skilled in the art can easily realize other advantages and modifications, so without departing from the claims and equivalents The invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without limiting the spirit and scope of the general concepts defined herein.

Claims (10)

1. a lithium battery grading system in groups, is characterized in that, comprising:

The clamping device of stack battery, is provided with the probe for docking each cell both positive and negative polarity, stretches out and is connected to the first wire of charge and discharge device respectively from both positive and negative polarity probe;

Charge and discharge device, is inside provided with charging, the discharge circuit of battery, and it is for being connected to supply unit and energy recycle device;

Supply unit, the external utility grid of supply unit, and electric main is become to low-voltage DC for charge and discharge device, the each cell in clamping device is charged;

Energy recycle device, is back in utility grid or local power net for the discharge voltage of the each cell of charge and discharge device raising and converting alternating current to;

Test control panel, for detection of and control the situation that discharges and recharges of each cell, and record the charging of each cell, size and the time of discharging current.

2. lithium battery as claimed in claim 1 grading system in groups, it is characterized in that: the clamping device of described stack battery comprises base, top board, bottom plate and upwards extends through the guide rod of bottom plate from base, between described top board and bottom plate, be provided with cylinder driver, leader casing between bottom plate and base is provided with spring, the opposite face of top board and bottom plate is also respectively arranged with needle plate and lower needle plate, on lower needle plate, is also placed with cell collecting box.

3. lithium battery as claimed in claim 1 grading system in groups, is characterized in that: described energy recycle device comprises BOOST booster circuit and inverter circuit.

4. lithium battery as claimed in claim 1 grading system in groups, it is characterized in that: described test control panel can be set maximum charging voltage and the minimum discharge voltage of each cell, and the real-time voltage of the each cell of implementing monitoring, to control the opening and closing that each cell is discharged and recharged.

5. lithium battery as claimed in claim 1 grading system in groups, is characterized in that: described grading system also comprises storing framework that can layering, all lays the clamping device of described stack battery on every layer of storing framework.

6. lithium battery as claimed in claim 1 grading system in groups, is characterized in that: described supply unit converts electric main to 12V direct current.

7. lithium battery as claimed in claim 1 grading system in groups, is characterized in that: described lithium battery in groups grading system is also provided with electric cabinet, and described charge and discharge device, supply unit, energy recycle device and test control panel are contained in electric cabinet.

8. lithium battery as claimed in claim 2 grading system in groups, is characterized in that: described upper needle plate is consistent with lower needle plate structure, is equipped with some probes that matrix is arranged that are on it.

9. lithium battery as claimed in claim 1 grading system in groups, is characterized in that: the charging of described charge and discharge device, the electric current of electric discharge are 20A～30A.

10. the arbitrary lithium battery grading system in groups as described in claim 1-9, it is characterized in that: described lithium battery in groups grading system also comprises internal resistance of cell detecting unit, described internal resistance of cell detecting unit can detect the internal resistance of battery simultaneously and be recorded in test control panel in the time of cell partial volume.

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