CN207117203U - A kind of lithium-ion energy storage unit and unit group - Google Patents

A kind of lithium-ion energy storage unit and unit group Download PDF

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Publication number
CN207117203U
CN207117203U CN201720020440.2U CN201720020440U CN207117203U CN 207117203 U CN207117203 U CN 207117203U CN 201720020440 U CN201720020440 U CN 201720020440U CN 207117203 U CN207117203 U CN 207117203U
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China
Prior art keywords
lithium
battery
storage unit
energy storage
ion
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CN201720020440.2U
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Chinese (zh)
Inventor
冯进喜
邹岩
张公全
张明冉
陈璐明
刘志远
李鹏军
皇利杰
胡建超
夏德印
兰殿星
宋军伟
魏建云
张省
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XJ Electric Co Ltd
Xuji Power Co Ltd
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XJ Electric Co Ltd
Xuji Power Co Ltd
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Abstract

It the utility model is related to a kind of lithium-ion energy storage unit and unit group, by setting battery management system, battery pack and charging circuit connected corresponding to its inside energy-storage units, realize the integration of battery charging and management, energy-storage units connecting line of the present utility model is short out, simple in construction, and easily realize, solve the problems, such as that existing lithium ion battery peripheral hardware charger, BMS cause connection line easily to break down.

Description

A kind of lithium-ion energy storage unit and unit group
Technical field
The utility model belongs to back-up source technical field of energy storage, and in particular to a kind of lithium-ion energy storage unit and unit Group.
Background technology
Traditional UPS(Uninterrupted power source)System typically selects lead-acid battery as standby energy-storage units, but same capacity Battery pack, it is that volume is big, quality weight the shortcomings that lead-acid battery, great space-consuming, as the replacement of lead-acid battery, lithium battery Because its small volume, energy density are high, today of growing tension there is larger economic value and social value in space.Especially It is the ternary lithium ion battery of Boston company, there is higher energy density, energy density is up to 207Wh/kg;With wider Temperature range, can charge, can be discharged in the range of -40 DEG C~70 DEG C in the range of -20 DEG C~60 DEG C;With higher Service life, 100%DOD(100% electric discharge)Its cycle life is not less than 1000 times, and its cycle life of 90%DOD is not less than 2000 Secondary, its cycle life of 80%DOD is not less than 3000 times.
Directly it is together in series to form the battery pack of different voltage class unlike lead-acid battery, ternary battery needs in groups Can just be used after assembling, also, due to lithium battery can not long-term floating charge, outside generally requires configuration battery management system (BMS)To control charger, it is ensured that battery is not overcharged.
In regular maintenance, in order to carry out charge-discharge test and maintenance to each battery pack, also to be set in outside batteries Charger, along with the battery management system for being likewise provided at outside batteries, make the external cabling of lithium ion battery more and miscellaneous, easily Generation line fault, inconvenience uses and later maintenance;Also, in the prior art to the charging of all cells in battery pack Work is only completed by a charger, can so be caused cell charging unbalanced, is unfavorable for the service life of battery.Cause This, how to rationally design a set of energy density it is high, it is multiple functional, easy to use and safeguard energy-storage units, turn into ternary lithium from Significant problem of the sub- battery in application and popularizations field face.
Utility model content
The purpose of this utility model is to provide a kind of lithium-ion energy storage unit and unit group, for solving existing lithium-ion electric The problem of pond peripheral hardware charger and BMS cause connection line easily to break down.
In order to solve the above technical problems, the utility model proposes a kind of lithium-ion energy storage unit, including five unit schemes:
Unit scheme one, the battery pack of lithium ion single battery formation of the energy-storage units including two or more series connection, Battery management system and more than one charging circuit;The battery management system sampling connects the battery pack, the battery Management system also includes being used for the communication interface for connecting host computer;The lithium of the corresponding number of output end connection of the charging circuit from Sub- cell, the input of charging circuit are used to connect charge power supply.
Unit scheme two, on the basis of unit scheme one, the charging circuit is rectification circuit, and the charge power supply is AC power.
Unit scheme three, on the basis of unit scheme one, the charging circuit is DC transfer circuit, the charging electricity Source is dc source.
Unit scheme four, on the basis of unit scheme one, the communication interface is CAN interface.
Unit scheme five, on the basis of unit scheme one, the battery management system includes being used for external low-voltage direct The power interface of power supply.
In order to solve the above technical problems, the utility model proposes a kind of lithium-ion energy storage unit group, including five unit groups Scheme:
Unit prescription case one, including the series-parallel energy-storage units of two or more, each energy-storage units include two or more string The battery pack in addition to battery management system and more than one charging circuit that the lithium ion single battery of connection is formed;The electricity Pond management system sampling connects the battery pack, and the battery management system also includes being used for the communication interface for connecting host computer; The cell of the corresponding number of output end connection of charging circuit, the input of charging circuit are used to connect charge power supply.
Unit prescription case two, on the basis of unit prescription case one, the charging circuit is rectification circuit, the charging electricity Source is AC power.
Unit prescription case three, on the basis of unit prescription case one, the charging circuit is DC transfer circuit, described to fill Power supply is dc source.
Unit prescription case four, on the basis of unit prescription case one, the communication interface is CAN interface.
Unit prescription case five, on the basis of unit prescription case one, the battery management system includes being used for external low pressure The power interface of dc source.
The beneficial effects of the utility model are:By inside energy-storage units set battery management system, battery pack and with Its charging circuit accordingly connected, realize the integration of battery charging and management, energy-storage units connection line of the present utility model It is short, simple in construction, and easily realize, efficiently solve existing lithium ion battery peripheral hardware charger, BMS causes connection line easy The problem of breaking down.
Brief description of the drawings
Fig. 1 is lithium-ion energy storage unit group schematic diagram;
Fig. 2 is lithium-ion energy storage cell schematics;
Fig. 3 is energy-storage units charging circuit procedure logical control system figure;
Fig. 4 is energy-storage units battery management system procedure logical control system figure.
Embodiment
Specific embodiment of the present utility model is further described below in conjunction with the accompanying drawings.
A kind of embodiment of lithium-ion energy storage unit group of the present utility model:
Energy-storage units group includes energy-storage units in parallel after first connecting, wherein each series arm comprises at least two energy storage Unit, each energy-storage units include two or more series connection lithium ion single battery formed battery pack, battery management system and More than one charging circuit;Battery management system sampling connection battery pack, battery management system also includes upper for connecting The communication interface of machine;The cell of the corresponding number of output end connection of charging circuit, the input of charging circuit are used to connect Charge power supply.
As shown in figure 1, pass through the 116.8V/265Ah energy-storage units groups of connection in series-parallel composition for 10 energy-storage units, due to every Individual battery pack electric parameter is 58.4V/53Ah, and to meet DC110V DC power-supply system, two energy-storage units are first connected, To meet the needs of system voltage grade;It is in parallel after each two energy-storage units are connected, to ensure battery charge balancing, meet to put Electric current and the requirement of standby working time, are advantageous to the reliability of raising system, even if having a battery failure or one Branch trouble, other branch roads in the same old way can normal work, the whole system powered can export reliably in the same old way, be unlikely to power down, special Not Shi Yongyu ups system standby energy-storage system.
A kind of lithium-ion energy storage unit as shown in Figure 2, including battery management system, provided with for connecting host computer CAN interface, battery pack and the first charging circuit and the second charging circuit are connected by CAN.Wherein, battery management system by 24V powered by direct current, 24V DC sources are connected by power interface;Battery pack is made up of the cell of 10 and 16 strings, battery pack Positive pole be provided with counnter attack diode, battery pack can be allowed to carry out connection in series-parallel, and avoid the electric discharge between battery pack, meet DC48V, The requirement of DC110V, DC220V difference voltage levels direct current busbar;Negative pole is provided with Hall current sensor, for detecting battery Total output current of group, the SOC of the energy-storage units is calculated with this, reference is provided for user's use.
Above-mentioned cell is divided into preceding 8 string and rear 8 strings, and the first charging circuit charges to the cell of preceding 8 strings, the Two charging circuits charge to the cell of rear 8 strings.Cell is using the higher Boston of volume energy density Ternary battery, volume energy density are up to 490Wh/L, and single battery group electric parameter is 58.4V/53Ah.
First charging circuit and the second charging circuit are rectification circuit, are powered by 220V alternating current sources, above-mentioned rectification circuit Including AC/DC units and DC/DC units;Wherein, AC/DC units have high power unit using VICOR companies FE175D480TD033FP-00 modules, AC-input voltage export stable DC48V direct currents between AC85V~264V; DC/DC units use two-tube BUCK-BOOST circuits, and it is straight for DC22V~DC33.6V that the DC48V of input is transformed into voltage range Stream electricity.
As other embodiment, the first charging circuit and the second charging circuit are DC transfer circuit, straight by DC source Power supply is connect, i.e. DC transfer circuit uses two-tube BUCK-BOOST circuits, and the DC source of input is transformed to the direct current of needs.
The external interface of energy-storage units is divided into major loop interface and control loop interface, major loop interface be energy-storage units just Pole interface and negative pole interface, it is single needle core interface.Control loop interface is used for battery management system and realized to battery pack and charging The control of circuit, the interface are 8 needle interfaces, and interface uses aviation plug, have and connect the characteristics of reliable, easy to use, and Function with Anti-misplug.6 pins in 8 needle interfaces of control loop are respectively that charging circuit input power L ends, charging circuit are defeated Enter power supply N-terminal, communication terminal CANH, communication terminal CANL, accessory power supply 24V+, accessory power supply 24V-.
As long as the energy-storage units access 220V AC powers and 24V dc sources, automatic charging can be carried out, without Outside other chargings and detection device, its operation principle are as follows:
The output voltage of first charging circuit and the second charging circuit is set to 32V, and charging current limiter value is set to 8A, cell The protection value for overcharging protection voltage is 4.2V.Battery management system controls the first charging circuit to fill preceding 8 string cells Electricity, the second charging circuit of control charges to rear 8 string cells, when one of monomer battery voltage reaches the first setting During value, battery management system controls corresponding charging circuit to stop charging to cell by CAN.
The built-in of battery management system can gather monomer battery voltage, battery pack temperature, battery discharge current, electricity in real time Pond group charging current, battery voltage etc., according to the data collected charging circuit can be controlled to carry out constant-current charge to lithium battery, When the monomer voltage for having cell reaches the first setting value, during such as 4.2V, the charging electricity that is charged to the cell Road can stop charging under the control of battery management system, it is ensured that and battery is not overcharged, and effectively extends battery, and its The charging process of its charging circuit is unaffected, has positive effect to the uniformity for improving monomer battery voltage in battery pack.
Meanwhile battery management system can be calculated according to the data for collecting monomer voltage, be judged in battery pack Highest cell voltage and minimum cell voltage and the numbering for showing respective battery, according to working as the data estimation battery pack collected Preceding battery capacity and SOC.Battery management system is additionally provided with warning function, and cell overvoltage, list can be uploaded by CAN communication Body battery undervoltage, battery pack excess temperature and the excessively low warning message of battery capacity.
In the present embodiment, as long as single battery group connection 220V alternating currents and 24V auxiliary direct currents in single energy-storage units Electric can realizes automatic charging, convenient that it is separately maintained, and need not reconnect other charging circuits.

Claims (10)

1. a kind of lithium-ion energy storage unit, include the battery pack of the lithium ion single battery formation of two or more series connection, its feature It is, battery management system and more than two charging circuits is set inside the lithium-ion energy storage unit;The battery management Systematic sampling connects the battery pack, and the battery management system also includes being used for the communication interface for connecting host computer;Each charging The lithium ion single battery of the corresponding number of output end connection of circuit, the input of charging circuit are used to connect charge power supply, respectively The lithium ion single battery sum of the corresponding number of the output end connection of charging circuit is equal to lithium ion in lithium-ion energy storage unit The total number of cell.
2. lithium-ion energy storage unit according to claim 1, it is characterised in that the charging circuit is rectification circuit, institute It is AC power to state charge power supply.
3. lithium-ion energy storage unit according to claim 1, it is characterised in that the charging circuit is DC converting electricity Road, the charge power supply are dc source.
4. lithium-ion energy storage unit according to claim 1, it is characterised in that the communication interface is CAN interface.
5. lithium-ion energy storage unit according to claim 1, it is characterised in that the battery management system is included for outer Connect the power interface of low-voltage dc power supply.
6. a kind of lithium-ion energy storage unit group, including the series-parallel energy-storage units of two or more, each energy-storage units include two The battery pack that the lithium ion single battery of series connection is formed above, it is characterised in that set inside the lithium-ion energy storage unit electric Pond management system and more than two charging circuits;The battery management system sampling connects the battery pack, the cell tube Reason system also includes being used for the communication interface for connecting host computer;The monomer electricity of the corresponding number of output end connection of each charging circuit Pond, the input of charging circuit are used to connect charge power supply, the lithium ion of the corresponding number of the output end connection of each charging circuit Cell sum is equal to the total number of lithium ion single battery in lithium-ion energy storage unit.
7. lithium-ion energy storage unit group according to claim 6, it is characterised in that the charging circuit is rectification circuit, The charge power supply is AC power.
8. lithium-ion energy storage unit group according to claim 6, it is characterised in that the charging circuit is DC converting electricity Road, the charge power supply are dc source.
9. lithium-ion energy storage unit group according to claim 6, it is characterised in that the communication interface is CAN interface.
10. lithium-ion energy storage unit group according to claim 6, it is characterised in that the battery management system includes using In the power interface of external low-voltage dc power supply.
CN201720020440.2U 2017-01-09 2017-01-09 A kind of lithium-ion energy storage unit and unit group Active CN207117203U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108711895A (en) * 2018-04-28 2018-10-26 北京机械设备研究所 A kind of lithium battery group for UPS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108711895A (en) * 2018-04-28 2018-10-26 北京机械设备研究所 A kind of lithium battery group for UPS

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