CN214898552U - Lithium battery module identification circuit - Google Patents
Lithium battery module identification circuit Download PDFInfo
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- CN214898552U CN214898552U CN202120310899.2U CN202120310899U CN214898552U CN 214898552 U CN214898552 U CN 214898552U CN 202120310899 U CN202120310899 U CN 202120310899U CN 214898552 U CN214898552 U CN 214898552U
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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
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Abstract
A lithium battery module identification circuit is connected between a battery management system and a plurality of battery module boxes, the battery module boxes are connected in parallel, the battery management system is provided with a plurality of slave control units and a master control unit, the slave control units are connected with the corresponding battery module boxes, and the slave control units comprise a plurality of first voltage division circuits and a second voltage division circuit; the input ends of the plurality of first voltage division circuits are connected with a first input voltage; the input end of the second voltage division circuit is connected with a second input voltage; the input end of the slave control unit is connected with the output end of the corresponding first voltage division circuit to acquire a first voltage to identify the module number and send the module number to the master control unit, and the master control unit is connected with the output end of the second voltage division circuit to acquire a second voltage to identify the module number. The utility model discloses can realize the automatic identification module, need not manual configuration, reduce the probability of makeing mistakes, it is with low costs.
Description
Technical Field
The utility model relates to a lithium cell module field, especially a lithium cell module identification circuit.
Background
In an electric vehicle or a hybrid vehicle, a plurality of power batteries are used as power sources, and a plurality of batteries are combined into a battery module box for convenient management. Referring to fig. 1, in a current distributed battery management system, a master module (hereinafter, referred to as a master module) is mainly configured as a master-slave module, and a master module (hereinafter, referred to as a slave control unit) is responsible for communicating with a slave module (hereinafter, referred to as a slave control unit) and a vehicle control unit (a communication method is not limited, and a CAN bus is taken as an example), so that information data interaction between the slave control unit and the vehicle control unit is realized. However, when the acquisition module samples the voltage and the temperature of each module and sends data to the main control unit or other modules, the position information of the acquisition module is sent out, so that the main control unit can only know the position of the acquisition module, and the voltage, the temperature and other data of each single battery are in one-to-one correspondence through calculation.
At present, to realize the identification of each module position, a new battery needs to be manually configured with each module number, and when the module is replaced, the module number is reconfigured, and because the module number is longer, manual configuration is easy to make mistakes, so that the battery cannot be used. In addition, when the module is identified, if one of the modules has a problem, the module which cannot be positioned has a problem, and a problem is brought to troubleshooting.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at overcomes among the prior art manual configuration and makes mistakes easily, and the defect of the unusual module of unable location provides a lithium cell module identification circuit.
The utility model adopts the following technical scheme:
the utility model provides a lithium battery module identification circuit, connects between battery management system and a plurality of battery module case, and these a plurality of battery module case are parallelly connected, and battery management system is equipped with a plurality of slave control units and main control unit, should link to each other its characterized in that from the battery module case that the control unit and correspond: the circuit comprises a plurality of first voltage division circuits and a plurality of second voltage division circuits; the input ends of the plurality of first voltage division circuits are connected with a first input voltage; the input end of the second voltage division circuit is connected with a second input voltage; the input end of the slave control unit is connected with the output end of the corresponding first voltage division circuit to acquire a first voltage to identify the module number and send the module number to the master control unit, and the master control unit is connected with the output end of the second voltage division circuit to acquire a second voltage to identify the module number.
Preferably, the first voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, the input voltage is connected to one end of the first voltage-dividing resistor, the other end of the first voltage-dividing resistor is connected to one end of the slave control unit and one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is connected to a ground terminal of the battery module box.
Preferably, in different first voltage dividing circuits, the first voltage dividing resistors have the same resistance value, and the second voltage dividing resistors have different resistance values.
Preferably, in different first voltage dividing circuits, the resistance values of the second voltage dividing resistors are increased or decreased in the order of the module numbers.
Preferably, in the battery module box of the adjacent module number, the difference range of the first voltage collected by the control unit is 0.7V-0.9V.
Preferably, the second voltage dividing circuit includes a plurality of third voltage dividing resistors and a fourth voltage dividing resistor, the plurality of third voltage dividing resistors are connected in parallel, one end of each third voltage dividing resistor is connected to the second input voltage, the other end of each third voltage dividing resistor is connected to the main control unit and one end of each fourth voltage dividing resistor, and the other end of each fourth voltage dividing resistor is grounded.
Preferably, the third voltage dividing resistor and the fourth voltage dividing resistor have the same resistance value.
Preferably, the slave control unit outputs the first input voltage and the second input voltage.
From the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. the utility model discloses in, be provided with first divider circuit and second divider circuit, through the first voltage of gathering first divider circuit from the accuse unit with the identification module number, the second voltage of second divider circuit is gathered with the identification module number to the main control unit, realizes the automatic identification module, need not manual configuration, reduces the probability of makeing mistakes, and is with low costs.
The utility model discloses in, first divider circuit is provided with first divider resistance and second divider resistance, and in the different first divider circuit, the resistance of first divider resistance is the same, and the resistance of second divider resistance is different, and then in the battery module case of difference, the first voltage that acquires from the accuse unit is different to this discernment module number, the circuit is simple, the realization is easy.
3. In the utility model, in different first voltage dividing circuits, according to the sequence of module numbers, the resistance value of the second voltage dividing resistor is increased or decreased progressively, and the values of the second voltage dividing resistor and the second voltage dividing resistor are related to the safety current required by the slave control unit; in the battery module box of the adjacent module number, the difference range of the first voltage collected by the control unit is 0.7V-0.9V, namely the voltage difference cannot be too small or too large, and the voltage difference is too small, so that the judgment result is easily influenced by errors.
4. The utility model discloses in, the second divider circuit is provided with third divider resistance and fourth divider resistance, and the two resistance is the same, and its value is relevant with the safe electric current that the master control unit required, and when the battery module quantity of inserting is different, the second voltage that host system gathered is different to this judges the module number, and the circuit is simple, the realization is easy.
5. The utility model discloses in, the main control unit still can compare module number and the quantity of received module number, if unanimous, then the discernment is successful, if inconsistent, still can fix a position unusual battery module case.
Drawings
Fig. 1 is a diagram of a conventional battery management system and a plurality of battery module boxes connecting roads;
FIG. 2 is a circuit diagram of the present invention;
10, a master control unit, 20, a slave control unit, 30, a battery module box, R1, a first voltage-dividing resistor, R2, a second voltage-dividing resistor, R3, a third voltage-dividing resistor, R4, a fourth voltage-dividing resistor, V1, a first voltage, V2 and a second voltage.
Detailed Description
The present invention will be further described with reference to the following detailed description.
The terms "first", "second", and the like in the present invention are used for convenience of description only to distinguish different constituent elements having the same name, and do not indicate a sequential or primary-secondary relationship.
In the description of the present invention, the directions or positional relationships indicated by "up", "down", "left", "right", "front", and "rear" are used as the directions or positional relationships indicated by the drawings, and are only for convenience of description of the present invention, and it is not intended to indicate or imply that the device indicated must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the scope of the present invention.
Referring to fig. 2, a lithium battery module identification circuit is connected between a battery management system and a plurality of battery module boxes 30, the plurality of battery module boxes 30 are connected in parallel, the battery management system is provided with a plurality of slave control units 20 and a master control unit 10, the slave control units 20 are connected with the corresponding battery module boxes 30, and the lithium battery module identification circuit further comprises a plurality of first voltage division circuits and a second voltage division circuit; the input ends of the plurality of first voltage division circuits are connected with a first input voltage; the input end of the second voltage division circuit is connected with a second input voltage; the input end of the slave control unit 20 is connected with the output end of the corresponding first voltage division circuit to acquire a first voltage V1 to identify the module number and send the module number to the master control unit 10, and the master control unit 10 is connected with the output end of the second voltage division circuit to acquire a second voltage V2 to identify the module number.
The number of the battery module boxes 30 may be N, the positive electrodes of the battery module boxes 30 are connected, and the negative electrodes of the battery modules are connected. A plurality of lithium iron phosphate batteries may be connected in series within each battery module box 30. In the battery management system, the number of the slave control units 20 is also N, that is, the slave control units 20 correspond to the battery module boxes 30 one to one, and the slave control units 20 may be configured to collect relevant parameter information of the corresponding battery module boxes 30, such as temperature, voltage, and the like. The slave control unit 20 and the master control unit 10 CAN realize connection communication through a CAN bus.
Further, each of the first voltage dividing circuits includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the first input voltage is connected to one end of the first voltage dividing resistor R1, the other end of the first voltage dividing resistor R1 is connected to the slave unit 20 and one end of the second voltage dividing resistor R2, and the other end of the second voltage dividing resistor R2 is connected to the ground terminal of the battery module box 30. Namely, the first input voltage connected with the input end of each voltage division circuit is the same, and the end of the first voltage division resistor R1 connected with the second voltage division resistor R2 is used as the output end of the voltage division circuit. The first input voltage may be from the slave control unit 20, that is, when the battery module case 30 is connected to the slave control unit 20, the slave control unit 20 outputs the first input voltage to the first voltage dividing circuit.
Further, in different first voltage-dividing circuits, the resistance values of the first voltage-dividing resistors R1 are the same, and the resistance values of the second voltage-dividing resistors R2 are different, so that the first voltages V1 obtained from the control unit 20 are different in different battery module boxes. The slave unit 20 may pre-store a table of the correspondence between the first voltage V1 and the module number, and may query the corresponding module number according to the first voltage V1. The slave unit 20 may change the default value to the module number and send it to the master unit 10.
The utility model discloses in, in the first divider circuit of difference, according to the order of module number, the resistance of second divider resistance R2 corresponds for increasing progressively or steadilyd decrease. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 cannot select a resistor combination with a smaller current, otherwise the sampled first voltage V1 is easily disturbed. The values of the two are also related to the safety current required by the slave control unit 20, that is, the current generated by the first voltage division circuit cannot exceed the safety current required by the slave control unit 20.
In practical application, in adjacent module numbers, the difference range of the first voltage V1 collected from the control unit 20 is 0.7V-0.9V, that is, the voltage difference cannot be too small or too large, and if the voltage difference is too small, the judgment result is easily affected by errors.
Further, the second voltage dividing circuit includes a plurality of third voltage dividing resistors R3 and a fourth voltage dividing resistor R4, the plurality of third voltage dividing resistors R3 are connected in parallel, one end of each third voltage dividing resistor R3 is connected to the second input voltage, the other end of each third voltage dividing resistor R3 is connected to the main control unit 10 and one end of the fourth voltage dividing resistor R4, and the other end of the fourth voltage dividing resistor R4 is grounded. The second input voltage may also be derived from the slave control unit 20, i.e., when the battery module case 30 is connected to the slave control unit 20, the slave control unit 20 outputs the second input voltage to the second voltage division circuit. The second input voltage may be the same as or different from the first input voltage, and may be set according to the requirement, without limitation, for example, in fig. 2, the first input voltage and the second input voltage are the same and are both Vin.
The third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 have the same resistance, and the values of the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are related to the safety current required by the main control unit 10, that is, the current generated by the second voltage dividing circuit cannot exceed the safety current required by the main control unit 10.
In the second voltage division circuit, when the number of the accessed battery modules is different, the second voltage V2 collected by the main control unit 10 is different. The main control unit 10 may pre-store a table of correspondence between the second voltage V2 and the number of modules, and the corresponding number of modules may be searched according to the second voltage V2.
The utility model discloses a from accuse unit 20 and main control unit 10 can adopt STM32 series chip, in main control unit 10, still can compare the quantity of module number and received module number, if unanimous, then the discernment is successful. If one of the battery module boxes 30 is not accessed or is abnormal, the main control unit 10 recognizes that the number of modules is not consistent with the number of the received module numbers, and excludes the battery module box 30 receiving the module number, so that the abnormal battery module box 30 can be located.
Examples of applications are:
in the first voltage dividing circuit, the resistance of the first voltage dividing resistor R1 is 1k, and in order of module numbers, the resistance of the second voltage dividing resistor R2 is increased correspondingly, for example, 1k, 2k … nk, and the first input voltage is 5V.
See table 1 for the first voltage V1 and the corresponding table of module numbers
TABLE 1
If the first voltage V1 obtained from the slave control unit 20 corresponding to a certain battery module box 30 is 2.5V, the corresponding module number is 0x01, the slave control unit 20 can change the default value to the module number of 0x01 and send the module number to the master control unit 10, and the other battery module boxes 30 and the like.
In the second voltage division circuit, the third voltage division resistor R3 and the fourth voltage division resistor R4 have resistance values of 10k, and the second input voltage is 5V. See table 2 for a second voltage V2 corresponding to the number of modules.
TABLE 2
If the second voltage V2 collected by the main control unit 10 is 2.5V, the corresponding number of modules can be found to be 1 according to table 2, and if the second voltage V2 is 3.3V, the corresponding number of modules is 2, and so on.
Assuming that the number of the module numbers received by the master control unit 10 from the slave control unit 20 is 3, and the corresponding module number is 4 according to the table lookup of the second voltage V2, it indicates that one of the battery module boxes 30 is abnormal, and the automatic identification fails.
The above-mentioned be the utility model discloses a concrete implementation way, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.
Claims (8)
1. The utility model provides a lithium battery module identification circuit, connects between battery management system and a plurality of battery module case, and these a plurality of battery module case are parallelly connected, and battery management system is equipped with a plurality of slave control units and main control unit, should link to each other its characterized in that from the battery module case that the control unit and correspond: the circuit comprises a plurality of first voltage division circuits and a plurality of second voltage division circuits; the input ends of the plurality of first voltage division circuits are connected with a first input voltage; the input end of the second voltage division circuit is connected with a second input voltage; the input end of the slave control unit is connected with the output end of the corresponding first voltage division circuit to acquire a first voltage to identify the module number and send the module number to the master control unit, and the master control unit is connected with the output end of the second voltage division circuit to acquire a second voltage to identify the module number.
2. The lithium battery module identification circuit as claimed in claim 1, wherein: the first voltage division circuit comprises a first voltage division resistor and a second voltage division resistor, the input voltage is connected with one end of the first voltage division resistor, the other end of the first voltage division resistor is connected with the slave control unit and one end of the second voltage division resistor, and the other end of the second voltage division resistor is connected with the grounding end of the battery module box.
3. The lithium battery module identification circuit as claimed in claim 2, wherein: in different first voltage dividing circuits, the resistance values of the first voltage dividing resistors are the same, and the resistance values of the second voltage dividing resistors are different.
4. The lithium battery module identification circuit as claimed in claim 3, wherein: in different first voltage division circuits, the resistance values of the second voltage division resistors are increased or decreased progressively according to the sequence of the module numbers.
5. The lithium battery module identification circuit as claimed in claim 3, wherein: in the battery module box of the adjacent module number, the difference range of the first voltage collected by the control unit is 0.7V-0.9V.
6. The lithium battery module identification circuit as claimed in claim 1, wherein: the second voltage division circuit comprises a plurality of third voltage division resistors and a fourth voltage division resistor, the third voltage division resistors are connected in parallel, one end of each third voltage division resistor is connected with the second input voltage, the other end of each third voltage division resistor is connected with the main control unit and one end of the fourth voltage division resistor, and the other end of each fourth voltage division resistor is grounded.
7. The lithium battery module identification circuit as claimed in claim 6, wherein: the third voltage dividing resistor and the fourth voltage dividing resistor have the same resistance value.
8. The lithium battery module identification circuit as claimed in claim 1, wherein: the slave control unit outputs the first input voltage and the second input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120310899.2U CN214898552U (en) | 2021-02-03 | 2021-02-03 | Lithium battery module identification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120310899.2U CN214898552U (en) | 2021-02-03 | 2021-02-03 | Lithium battery module identification circuit |
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| Publication Number | Publication Date |
|---|---|
| CN214898552U true CN214898552U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120310899.2U Active CN214898552U (en) | 2021-02-03 | 2021-02-03 | Lithium battery module identification circuit |
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| CN (1) | CN214898552U (en) |
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2021
- 2021-02-03 CN CN202120310899.2U patent/CN214898552U/en active Active
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