CN112072192A - Lithium battery management system and device - Google Patents
Lithium battery management system and device Download PDFInfo
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- CN112072192A CN112072192A CN202010968949.6A CN202010968949A CN112072192A CN 112072192 A CN112072192 A CN 112072192A CN 202010968949 A CN202010968949 A CN 202010968949A CN 112072192 A CN112072192 A CN 112072192A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 107
- 238000004891 communication Methods 0.000 claims description 13
- 230000010354 integration Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a lithium battery management system and device, and belongs to the technical field of batteries. The system comprises a fire-fighting main control unit, a BMS main control unit, N lithium battery units connected in series, a first protection unit, a first charging power supply connecting end and a second charging power supply connecting end; the first charging power supply connecting end is connected with the first end of the first protection unit, the second end of the first protection unit is connected with the first end of the first lithium battery unit, and the second end of the Nth lithium battery unit is connected with the second charging power supply connecting end; the battery unit comprises a BMU, a detector and a plurality of lithium batteries connected in series, the lithium batteries are respectively connected with the BMU and the detector, the BMU is connected with the BMS main control unit, and the detector is connected with the fire-fighting main control unit. The battery fire prediction system is high in integration degree, accurate in battery fire prediction and timely in warning information uploading.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a lithium Battery Management System (BMS) and a device thereof.
Background
Whenever the lithium battery technology breaks through, the lithium battery has potential safety hazards, and energy stored in the space tends to be released, sometimes released or violent. Therefore, reasonable fire prevention and extinguishing measures are considered in the whole life cycle of the lithium battery except for safe use specifications. For the whole lithium battery system, how to quantify the fire protection risk and how to effectively protect the fire protection danger become new challenges. The safety of the lithium battery plays a decisive role in the popularization degree of the lithium battery in the future market. In addition to improving the safety performance of the lithium battery in the aspects of battery material systems and cell manufacturing processes, the safety protection of the grouped lithium battery systems is also very important.
At present, the auxiliary safety measure of the lithium battery system is mainly a fire extinguishing system, and the traditional fire extinguishing system is only a set of independent fire extinguishing device, so that the triggering condition is achieved, the automatic action is realized, and the auxiliary safety measure is not linked with external connection and is not shared with external information. Such stand-alone fire protection systems have difficulty meeting the increasing objective demands for lithium battery safety concerns.
Disclosure of Invention
The embodiment of the invention provides a lithium battery management system and a lithium battery management device, wherein the system/the device has an intelligent fire-fighting management function and aims to solve the technical problems that most of existing battery fire-fighting detection equipment is independently arranged outside a battery module, lacks communication and information mutual sharing with an external device, and is difficult to detect the battery burning state in time, so that the optimal time for fire-fighting and fire-extinguishing is lost.
In order to achieve the above objects, in one aspect, embodiments of the present invention provide a lithium battery management system, including a fire-fighting main control unit, a BMS main control unit, N lithium battery cells connected in series, a first protection unit, a first charging power connection terminal, and a second charging power connection terminal;
the first charging power supply connecting end is connected with the first end of the first protection unit, the second end of the first protection unit is connected with the first end of the first lithium battery unit, and the second end of the Nth lithium battery unit is connected with the second charging power supply connecting end;
the lithium battery unit comprises a battery Monitoring unit BMU (Battery Monitoring Unit), a detector and a plurality of lithium batteries connected in series, wherein the lithium batteries are respectively connected with the BMU and the detector, the BMU is connected with the BMS main control unit, and the detector is connected with the fire-fighting main control unit; the first end of lithium cell of first lithium cell is connected the second end of first protection unit, the nth lithium cell the second end of lithium cell is connected the second charging power supply link.
Further, BMS main control unit with the fire control main control unit links each other.
Further, the lithium battery management system further comprises a DC unit, wherein a first end of the DC unit is connected with a second end of the first protection unit, and a second end of the DC unit is connected with the second charging power supply connection end; the output end of the DC unit is connected with the BMS main control unit.
Further, lithium battery management system still includes the circuit breaker, the first end of circuit breaker is connected the second end of first protection unit, the second end of circuit breaker is connected the second charging source link.
Further, the circuit breaker is a three-switch circuit breaker. The circuit breaker is mainly used for controlling connection and disconnection of a circuit.
Furthermore, the lithium battery management system further comprises a second protection unit, wherein a first end of the second protection unit is connected with a second end of the DC unit, and a second end of the second protection unit is connected with the second charging power supply connection end.
Furthermore, the lithium battery management system further comprises a first hall element, and the first hall element is connected between the second end of the nth lithium battery unit and the second end of the circuit breaker.
Furthermore, the lithium battery management system further comprises a second hall element, and the second hall element is connected between the first end of the first lithium battery unit and the second end of the circuit breaker.
Further, the first protection unit includes a first relay, a second relay, a third relay, a first diode, a second diode, and a first resistor;
after the first relay and the second relay are connected in series, one end of the first relay is connected with the first end of the DC unit, and the other end of the first relay is connected with the first charging power supply connecting end;
after the third relay and the first resistor are connected in series, one end of the third relay is connected with the first end of the DC unit, and the other end of the third relay is connected with the first charging power supply connecting end;
one end of the first diode and one end of the second diode after being connected in series are connected with the first end of the DC unit, and the other end of the first diode is connected with the first charging power supply connecting end;
one end of the first diode is connected between the first relay and the second relay.
Further, the second protection unit includes a fourth relay, a fifth relay, a sixth relay, a third diode, a fourth diode, and a second resistor;
after the fourth relay and the fifth relay are connected in series, one end of the fourth relay is connected with the second end of the DC unit, and the other end of the fourth relay is connected with the second charging power supply connecting end;
after the sixth relay and the second resistor are connected in series, one end of the sixth relay is connected with the second end of the DC unit, and the other end of the sixth relay is connected with the second charging power supply connecting end;
one end of the third diode and one end of the fourth diode after being connected in series are connected with the second end of the DC unit, and the other end of the third diode and the fourth diode are connected with the second charging power supply connecting end;
one end of the third diode is connected between the fourth relay and the fifth relay.
Further, the output voltage of the DC unit is 24V.
Further, the BMS main control unit is connected with the platform end through an external communication connecting end.
On the other hand, the embodiment of the invention also provides a cabinet type lithium battery management device, which comprises the lithium battery management system and a charging power supply, wherein a charging power supply connecting end of the lithium battery management system is connected with the charging power supply.
Further, the charging Power Supply is an Uninterruptible Power Supply (UPS).
According to the lithium battery management system and device, the detector and the BMU are arranged in the battery unit, so that point-to-point acquisition and detection of information in the battery can be realized, the condition that the battery is in a fire disaster is detected, and the fire point is accurately positioned; meanwhile, communication is established between the BMS main control unit and the fire-fighting main control unit, fire fighting is timely carried out through linkage of the BMS main control unit and the fire-fighting main control unit, the output of the battery and the outside is actively cut off, and then warning information is uploaded to the platform end through the external communication connecting end. The system of the application integrates highly, and is accurate to battery fire prediction, and the reaction is rapid, and the information is uploaded in time.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery management system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lithium battery management system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a lithium battery management system according to still another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lithium battery management device according to an embodiment 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.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Currently, most of the existing battery fire detection methods have the following disadvantages: most of the existing battery fire-fighting detection generally adopts fire detectors such as smoke detectors, temperature detectors, combustible gas detectors and the like. Because the fire detector is arranged on the cabinet layer and is arranged outside the battery module, the fire detector is a system independent of the battery, is a pure fire extinguishing device, does not have communication and does not have information mutual sharing. The limited sensitivity of the fire detector is difficult to detect the pre-burning state of the battery in time, and the optimal time for fire fighting is lost due to the possible non-timely response. Moreover, the fire detector is limited by the space size of the battery equipment, has high installation difficulty and is inconvenient to install.
In order to solve the technical problems, the invention provides a lithium battery management system and a lithium battery management device with intelligent fire protection, which comprise a battery pack, a BMS management system, a fire control system and the like, and can be matched with communication, data uploading and linkage response.
In the present application, the "first" indicates a positive electrode and the "second" indicates a negative electrode, except that the first relay, the second relay, the first diode, the second diode, and the like indicate the division numbers of the elements.
As shown in fig. 1, an embodiment of the present application provides a lithium battery management system, which includes a fire-fighting main control unit 10, a BMS main control unit 20, N lithium battery units 30 connected in series, a first protection unit 40, a first charging power connection terminal P +, and a second charging power connection terminal P-;
the first charging power connection end P + is connected to the first end of the first protection unit 40, the second end of the first protection unit 40 is connected to the first end of the first lithium battery unit 30, and the second end of the nth lithium battery unit 30 is connected to the second charging power connection end P-;
the lithium battery unit 30 comprises a battery monitoring unit BMU 31, a detector 32 and a plurality of lithium batteries 33 connected in series, the lithium batteries 33 are respectively connected with the BMU 31 and the detector 32, the BMU 31 is connected with the BMS main control unit 20, and the detector 32 is connected with the fire-fighting main control unit 10; the first end of the lithium battery 33 of the first lithium battery cell 30 is connected to the second end of the first protection unit 40, and the second end of the lithium battery 33 of the nth lithium battery cell 30 is connected to the second charging power connection terminal P-.
Further, the BMS main control unit 20 and the fire main control unit 10 are interlocked with each other.
In this embodiment, the detector 32 is connected to a fire extinguishing apparatus (not shown), and the fire fighting main control unit 10 is also connected to the fire extinguishing apparatus. Because the fire control main control unit is connected with extinguishing device, judge that the detected value reaches fire control trigger value or the fire control host computer receives BMS main control unit's fire control trigger information when the fire control main control unit's fire control host computer, fire control host computer control extinguishing device's gas storage system work, and fire control gas blowout to in time carry out the fire control and put out a fire.
Illustratively, the lithium battery management system further comprises a DC unit 50, wherein a first end of the DC unit 50 is connected to a second end of the first protection unit 40, and a second end of the DC unit 50 is connected to the second charging power connection terminal P-; the output terminal of the DC unit 50 is connected to the BMS main control unit 20.
Exemplarily, as shown in fig. 2, in another embodiment, the lithium battery management system further includes a circuit breaker 60, a first end of the circuit breaker 60 is connected to a second end of the first protection unit 40, and a second end of the circuit breaker 60 is connected to the second charging power connection terminal P-.
Specifically, the circuit breaker 60 is a three-switch circuit breaker. The circuit breaker is mainly used for controlling connection and disconnection of a circuit.
Exemplarily, as shown in fig. 2, the lithium battery management system further includes a second protection unit 70, a first end of the second protection unit 70 is connected to a second end of the DC unit 50, and a second end of the second protection unit 70 is connected to the second charging power connection terminal P-.
Specifically, in this embodiment, the lithium battery management system further includes a first hall element 80, and the first hall element 80 is connected between the second end of the nth lithium battery cell 30 and the second end of the circuit breaker 60.
Illustratively, the lithium battery management system further includes a second hall element 90, and the second hall element 90 is connected between the first end of the first lithium battery cell 30 and the second end of the circuit breaker 60.
In the application, the protection unit (including the first protection unit and the second protection unit) is a general protection unit, and can play a role in overcharge, overvoltage, overcurrent or overdischarge protection.
Exemplarily, as shown in fig. 3, in this embodiment, the first protection unit 40 includes a first relay K1, a second relay K2, a third relay K3, a first diode VD1, a second diode VD2, and a first resistor R1;
after the first relay K1 and the second relay K2 are connected in series, one end of the first relay K1 is connected with the first end of the DC unit 50, and the other end of the first relay K2 is connected with the first charging power supply connection end P +; it should be noted that, in this embodiment, the second terminal of the first relay K1 is connected to the first terminal of the DC unit 50, the first terminal of the first relay K1 is connected to the second terminal of the second relay K2, and the first terminal of the second relay K2 is connected to the first charging power connection terminal P +. Alternatively, in another embodiment, the second terminal of the second relay K2 is connected to the first terminal of the DC unit 50, the first terminal of the second relay K2 is connected to the second terminal of the first relay K1, and the first terminal of the first relay K1 is connected to the first charging power connection terminal P +.
After the third relay K3 and the first resistor R1 are connected in series, one end of the third relay K3 is connected to the first end of the DC unit 50, and the other end of the third relay K3 is connected to the first charging power connection end P +; in this embodiment, the second terminal of the third relay K3 is connected to the first terminal of the DC unit 50, the first terminal of the third relay K3 is connected to the second terminal of the first resistor R1, and the first terminal of the first resistor R1 is connected to the first charging power connection terminal P +. Alternatively, in another embodiment, the second end of the first resistor R1 is connected to the first end of the DC unit 50, the first end of the first resistor R1 is connected to the second end of the third relay K3, and the first end of the third relay K3 is connected to the first charging power connection terminal P +.
After the first diode VD1 and the second diode VD2 are connected in series, one end of the first diode is connected to the first end of the DC unit 50, and the other end of the first diode is connected to the first charging power connection end P +; it should be noted that, in this embodiment, the second terminal of the first diode VD1 is connected to the first terminal of the DC unit 50, the first terminal of the first diode VD1 is connected to the first terminal of the second diode VD2, and the second terminal of the second diode VD2 is connected to the first charging power connection terminal P +. Or, in other embodiments, the second terminal of the second diode VD2 is connected to the first terminal of the DC unit 50, the first terminal of the second diode VD2 is connected to the first terminal of the first diode VD1, and the second terminal of the first diode VD1 is connected to the first charging power connection terminal P +.
In the present embodiment, the first end of the first diode VD1 is connected between the first relay K1 and the second relay K2.
Illustratively, the battery management system further includes a start button SA provided between the first protection unit 40 and the DC unit 50. By means of the arrangement, when the BMS is powered off, the BMS can be started through cold starting of the starting button SA or through the starting voltage of the UPS end power supply, and the functionality and the stability of the system are improved.
Specifically, referring to fig. 3 again, the second protection unit 70 includes a fourth relay K4, a fifth relay K5, a sixth relay K6, a third diode VD3, a fourth diode VD4, and a second resistor R2;
the fourth relay K4 and the fifth relay K5 are connected in series, one end of the fourth relay K4 is connected with the second end of the DC unit 50, and the other end of the fourth relay K5 is connected with the second charging power supply connection end P-; in this embodiment, a first terminal of the fourth relay K4 is connected to a second terminal of the DC unit 50, a second terminal of the fourth relay K4 is connected to a first terminal of the fifth relay K5, and a second terminal of the fifth relay K5 is connected to the second charging power connection terminal P-. Or, in another embodiment, the first terminal of the fifth relay K5 is connected to the second terminal of the DC unit 50, the second terminal of the fifth relay K5 is connected to the first terminal of the fourth relay K4, and the second terminal of the fourth relay K4 is connected to the second charging power connection terminal P-.
The sixth relay K6 and the second resistor R2 are connected in series, and then one end of the sixth relay K6 is connected with the second end of the DC unit 50, and the other end of the sixth relay K2 is connected with the second charging power supply connection end P-; in this embodiment, a first terminal of the sixth relay K6 is connected to the second terminal of the DC unit 50, a second terminal of the sixth relay K6 is connected to the first terminal of the second resistor R2, and a second terminal of the second resistor R2 is connected to the second charging power connection terminal P-. Or, in another embodiment, a first terminal of the second resistor R2 is connected to a second terminal of the DC unit 50, a second terminal of the second resistor R2 is connected to a first terminal of the sixth relay K6, and a second terminal of the sixth relay K6 is connected to the second charging power connection terminal P-.
After the third diode VD3 and the fourth diode VD4 are connected in series, one end of each of the third diode VD3 and the fourth diode VD4 is connected to the second end of the DC unit 50, and the other end of each of the third diode VD and the fourth diode VD4 is connected to the second charging power connection terminal P-; it should be noted that, in this embodiment, the second terminal of the third diode VD3 is connected to the second terminal of the DC unit, the first terminal of the third diode VD3 is connected to the first terminal of the fourth diode VD4, and the second terminal of the fourth diode VD4 is connected to the second charging power connection terminal P-. Or, in other embodiments, the second terminal of the fourth diode VD4 is connected to the second terminal of the DC unit 50, the first terminal of the fourth diode VD4 is connected to the first terminal of the third diode VD3, and the second terminal of the third diode VD3 is connected to the second charging power connection terminal P-.
In the present embodiment, the first end of the third diode VD3 is connected between the fourth relay K4 and the fifth relay K5.
Further, the output voltage of the DC unit 50 is 24V.
Further, the BMS main control unit 20 is connected to the platform terminal 100 through an external communication connection terminal.
Further, the lithium battery unit 30 is connected to the fire control main control unit 10 and the BMS main control unit 20 through a CAN bus.
Furthermore, an RS485 cable is selected as the CAN bus.
It should be noted that, in the embodiment of the present application, a charge and discharge protection device may also be disposed between the first protection unit and the first charging power connection terminal P +, and for example, the charge and discharge protection device may be a protection plate, a first end of the protection plate is connected to the first charging power connection terminal P +, and a second end of the protection plate is connected to the second charging power connection terminal P-.
In addition, in the embodiment of the present application, a neutral line may be disposed at a connection center of the N lithium battery cells 30 connected in series (for example, when there are 4 lithium battery cells connected in series, a neutral line is disposed between the second lithium battery cell and the third lithium battery cell), and the neutral line may perform a voltage division function on the whole circuit.
The working process and control logic of the circuit of the application are as follows:
when the circuit is switched on, the following two response logics are mainly faced under the general condition:
1. if the electrical connection state of the battery system is completely normal:
the fire-fighting main control unit of the system does not work, and the battery management system operates normally. The BMU installed in the lithium battery unit continuously detects the voltage, temperature and other states of each battery, and the detector is mainly used for detecting the concentration of gas and smoke in real time. BMU uploads the information collection to BMS main control unit, and the detector uploads the information collection to fire control main control unit, and fire control main control unit and BMS main control unit's information intersection to as the judgement foundation of action separately, can upload the information to the platform end through BMS main control unit simultaneously.
2. If a short circuit occurs at a certain point in the battery system:
the temperature of nearby circuit components will rise rapidly, this system adopts the built-in fire detector of lithium cell unit will detect the abnormal conditions that this point takes place this moment, to the point-to-point information acquisition of the temperature of lithium cell, accurate positioning point of fire, BMS main control unit linkage fire control main control unit in time carries out the fire control and puts out a fire to initiatively cut off the output of battery and external, through to outside communication link with warning message upload to platform end.
In the above two battery system response logics, the common characteristic is that the circuit state signals received by the BMS main control unit and the fire control main control unit are transmitted to the higher-level observation device and the data processing device of the computer through the bus of the external communication connecting end, so that the technicians can conveniently monitor and adjust the circuit state signals in real time.
On the other hand, as shown in fig. 4, an embodiment of the present invention further provides a lithium battery management device, which includes the lithium battery management system 200 and a charging power supply 300, wherein a charging power supply connection terminal of the lithium battery management system 200 is connected to the charging power supply 300. The lithium battery management device is a cabinet type lithium battery management device, is convenient to install and is neat in wiring.
Further, the charging power supply 300 is an uninterruptible power supply UPS.
According to the lithium battery management system and device, the detector and the BMU are arranged in the battery unit, so that point-to-point acquisition and detection of information in the battery can be realized, the condition that the battery is in a fire disaster is detected, and the fire point is accurately positioned; simultaneously, through establishing the communication between BMS main control unit and the fire control main control unit, in time carry out the fire control through the two linkage and put out a fire: because the fire-fighting main control unit is connected with the fire-fighting device, when the fire-fighting host of the fire-fighting main control unit judges that the detection value reaches the fire-fighting trigger value or the fire-fighting host receives the fire-fighting trigger information of the BMS main control unit, the fire-fighting host controls the gas storage system of the fire-fighting device to work, and fire-fighting gas is sprayed out, so that fire fighting is carried out in time; detect extreme condition (for example fire control trigger information) when BMS main control unit, through the dropout of the circuit breaker on the BMS host computer control BMS high-voltage control case for battery end and external output cut off, thereby initiatively cut off battery and external output, guarantee the safety of load end, then upload to the platform end through external communication link with warning information. The system of the application integrates highly, and is accurate to battery fire prediction, and the reaction is rapid, and the information is uploaded in time. The lithium battery management device is of a cabinet type structure integrally, and pipelines and detection communication lines shuttle among the lithium battery management device, so that the lithium battery management device occupies a small space and has a good space utilization rate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A lithium battery management system is characterized by comprising a fire-fighting main control unit, a BMS main control unit, N lithium battery units connected in series, a first protection unit, a first charging power supply connecting end and a second charging power supply connecting end;
the first charging power supply connecting end is connected with the first end of the first protection unit, the second end of the first protection unit is connected with the first end of the first lithium battery unit, and the second end of the Nth lithium battery unit is connected with the second charging power supply connecting end;
the battery unit comprises a BMU, a detector and a plurality of lithium batteries connected in series, the lithium batteries are respectively connected with the BMU and the detector, the BMU is connected with the BMS main control unit, and the detector is connected with the fire-fighting main control unit; the first end of lithium cell of first lithium cell is connected the second end of first protection unit, the nth lithium cell the second end of lithium cell is connected the second charging power supply link.
2. The lithium battery management system of claim 1, wherein the BMS master control unit and the fire protection master control unit are interlocked with each other.
3. The lithium battery management system according to claim 1, further comprising a DC unit, wherein a first end of the DC unit is connected to a second end of the first protection unit, and a second end of the DC unit is connected to the second charging power connection terminal; the output end of the DC unit is connected with the BMS main control unit.
4. The lithium battery management system as claimed in claim 3, further comprising a circuit breaker, wherein a first end of the circuit breaker is connected to a second end of the first protection unit, and a second end of the circuit breaker is connected to the second charging power connection terminal.
5. The lithium battery management system as claimed in claim 3, further comprising a second protection unit, wherein a first end of the second protection unit is connected to a second end of the DC unit, and a second end of the second protection unit is connected to the second charging power connection terminal.
6. The lithium battery management system of claim 4, further comprising a first Hall element connected between the second end of the Nth lithium battery cell and the second end of the circuit breaker.
7. The lithium battery management system of claim 6, further comprising a second Hall element coupled between the first end of the first lithium battery cell and the second end of the circuit breaker.
8. The lithium battery management system as claimed in any one of claims 1 to 6, wherein the BMS main control unit is connected to the platform terminal through an external communication connection terminal.
9. The utility model provides a lithium battery management device which characterized in that includes lithium battery management system and charging source, lithium battery management system's charging source link is connected charging source.
10. The lithium battery management device as claimed in claim 9, wherein the charging power supply is an uninterruptible power supply.
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