CN114566725A - Sodium-lithium hybrid battery system and control method - Google Patents
Sodium-lithium hybrid battery system and control method Download PDFInfo
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- CN114566725A CN114566725A CN202210153033.4A CN202210153033A CN114566725A CN 114566725 A CN114566725 A CN 114566725A CN 202210153033 A CN202210153033 A CN 202210153033A CN 114566725 A CN114566725 A CN 114566725A
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- 238000000034 method Methods 0.000 title claims abstract description 55
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 189
- 239000011734 sodium Substances 0.000 claims abstract description 189
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 187
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 167
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 166
- 238000009826 distribution Methods 0.000 claims abstract description 69
- 230000005611 electricity Effects 0.000 claims abstract description 47
- 239000003381 stabilizer Substances 0.000 claims abstract description 25
- 230000037452 priming Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005070 sampling Methods 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
-
- 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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
-
- 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 sodium-lithium hybrid battery system and a control method thereof, wherein the sodium-lithium hybrid battery control method comprises the following steps: the battery management module acquires required power, calculates charging power required by the sodium battery module and charging power required by the lithium battery module and transmits the charging power to the power distribution module; taking the charging voltage of the lithium battery module as a reference, and adjusting the charging voltage of the sodium battery module by the voltage stabilizer; the power distribution module calculates the charging current of the sodium battery module according to the charging power required by the sodium battery module, and calculates the charging current of the lithium battery module according to the charging power required by the lithium battery module; the current is transmitted according to the charging current of the sodium battery module and the charging current of the lithium battery module. Complementary use in integrated to same battery system through sodium electricity module and lithium electricity module can compensate sodium electricity module product property ability, circulation performance and energy density's inferior position, and sodium electricity module and lithium electricity module use still have high power, better anti low temperature performance, can also reduce material cost with mixing.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a sodium-lithium hybrid battery system and a control method.
Background
The production of the combined battery needs to perform welding assembly of the battery pack, a plurality of battery cores are connected in series or in parallel through welding equipment, and accessories such as a battery protection plate, a battery shell and the like are assembled to obtain a combined battery product. The assembled battery requires that the batteries have high consistency, i.e. the consistency of capacity, internal resistance, voltage, discharge curve and life, is the same or similar, so in the prior art, the same batteries are generally used for combination, for example, the integrated application of lithium iron phosphate batteries, the integrated application of ternary lithium batteries, or the integration of sodium electrical systems.
The lithium battery and the sodium battery have certain advantages and disadvantages, the cycle performance, the charge-discharge rate and the energy density of the lithium battery are better, but the low-temperature performance and the cost of the lithium battery are poorer; the cycle performance and the energy density of the sodium battery are poor, but the safety and the low-temperature performance of the sodium battery are good, and the cost of the sodium battery is low, so that the sodium battery is beneficial to large-scale development.
Therefore, a system and a control method for realizing hybrid use of a sodium battery and a lithium battery are needed.
Disclosure of Invention
In view of the above, the present invention provides a sodium-lithium hybrid battery system and a control method thereof.
In one aspect, the present invention provides a sodium-lithium hybrid battery control method, including:
sodium electricity module, with the parallelly connected lithium electricity module of sodium electricity module moves simultaneously, including the charging process:
a battery management module coupled with the sodium electric module and the lithium electric module respectively reads the charge state of the sodium electric module and the charge state of the lithium electric module, and calculates the charge amount of the sodium electric module and the charge amount of the lithium electric module;
the battery management module acquires required power, calculates charging power required by the sodium battery module and charging power required by the lithium battery module and transmits the charging power to a power distribution module, one end of the power distribution module is electrically connected with an input bus, and the other end of the power distribution module is electrically connected with the sodium battery module and the lithium battery module respectively; taking the charging voltage of the lithium battery module as a reference, and adjusting the charging voltage of the sodium battery module by a voltage stabilizer electrically connected with the sodium battery module to enable the absolute value of the difference between the charging voltage of the sodium battery module and the charging voltage of the lithium battery module to be less than M, wherein M is more than or equal to 0;
the power distribution module calculates the charging current of the sodium battery module according to the charging power required by the sodium battery module, and calculates the charging current of the lithium battery module according to the charging power required by the lithium battery module; and delivering current according to the charging current of the sodium battery module and the charging current of the lithium battery module.
In another aspect, the present invention also provides a sodium-lithium hybrid battery system, including:
a lithium battery module;
the sodium electric module comprises a sodium electric module and a voltage stabilizer which are electrically connected;
one end of the power distribution module is electrically connected with the input bus, the other end of the power distribution module is electrically connected with the anode of the sodium electric module and the anode of the lithium electric module respectively, and the power distribution module is used for shunting the sodium electric module and the lithium electric module;
the output bus is electrically connected with the negative electrode of the sodium electric module and the negative electrode of the lithium electric module respectively;
the battery management module is respectively coupled with the lithium battery module, the sodium battery module, the voltage stabilizer, the power distribution module, the input bus and the output bus.
Compared with the prior art, the sodium-lithium hybrid battery system and the control method provided by the invention at least realize the following beneficial effects:
in the sodium-lithium hybrid battery control method provided by the invention, the sodium-electricity module and the lithium-electricity module connected in parallel with the sodium-electricity module run simultaneously, the charging voltage of the sodium-electricity module is adjusted by the voltage stabilizer electrically connected with the sodium-electricity module by taking the charging voltage of the lithium-electricity module as a reference, namely, the sodium-electricity module and the lithium-electricity module are integrated into the same battery system for complementary use, so that the disadvantages of the sodium-electricity module in the aspects of product performance, cycle performance, energy density and the like can be made up, the sodium-electricity module and the lithium-electricity module are mixed for use, the high power and better low temperature resistance are realized, and the material cost can be reduced.
The battery management module coupled with the sodium electric module and the lithium electric module respectively reads the charge state of the sodium electric module and the charge state of the lithium electric module, and calculates the charge amount of the sodium electric module and the charge amount of the lithium electric module; the battery management module acquires the required power, calculates the charging power required by the sodium battery module and the charging power required by the lithium battery module and transmits the charging power to the power distribution module, one end of the power distribution module is electrically connected with the input bus, and the other end of the power distribution module is electrically connected with the sodium battery module and the lithium battery module respectively; taking the charging voltage of the lithium battery module as a reference, and adjusting the charging voltage of the sodium battery module by a voltage stabilizer electrically connected with the sodium battery module; the power distribution module calculates the charging current of the sodium battery module according to the charging power required by the sodium battery module, and calculates the charging current of the lithium battery module according to the charging power required by the lithium battery module; the current is transmitted according to the charging current of the sodium battery module and the charging current of the lithium battery module. Control lithium electricity module and sodium electricity module through battery management module, each battery module is managed and maintained in the intellectuality, prevents the circumstances of overcharge and overdischarge, prolongs the life of battery, monitors the state of battery.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow chart of a charging process of a sodium-lithium hybrid battery control method provided by the invention;
FIG. 2 is a charge-discharge characteristic curve of a sodium battery;
fig. 3 is a flowchart of a discharging process of the sodium-lithium hybrid battery control method provided by the invention;
FIG. 4 is a flow chart of the priming process;
FIG. 5 is a flow chart of standby for failure;
fig. 6 is a schematic structural diagram of a sodium-lithium hybrid battery system provided by the present invention;
FIG. 7 is a circuit diagram of a pre-charge module;
FIG. 8 is a circuit diagram of a power distribution module;
the power supply comprises a 1-lithium battery module, a 2-sodium battery module, a 3-sodium battery module, a 4-voltage stabilizer, a 5-power distribution module, a 6-input bus, a 7-output bus, a 8-battery management module, a 9-pre-charging module, a 10-first branch circuit, a 11-pre-charging branch circuit, a 12-first relay, a 13-second relay, a 14-pre-charging resistor, a 15-branch circuit, a 16-third relay, a 17-first switch, a 18-second switch, a 19-first current collection module and a 20-second current collection module.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
With reference to fig. 1 and fig. 2, fig. 1 is a flow chart of a charging process of a sodium-lithium hybrid battery control method provided by the present invention; fig. 2 is a charge-discharge characteristic curve of the sodium-electricity module 3, which illustrates a specific embodiment of the method for controlling a sodium-lithium hybrid battery provided by the present invention, and includes:
s101: the battery management module 8 coupled with the sodium electric module 3 and the lithium electric module 1 respectively reads the charge state of the sodium electric module 3 and the charge state of the lithium electric module 1, and calculates the charge amount required by the sodium electric module 3 and the charge amount required by the lithium electric module 1;
s102: the battery management module 8 acquires the required power, calculates the charging power required by the sodium battery module 3 and the charging power required by the lithium battery module 1, and transmits the charging power to the power distribution module 5, one end of the power distribution module is electrically connected with the input bus 6, and the other end of the power distribution module is electrically connected with the sodium battery module 3 and the lithium battery module 1 respectively; taking the charging voltage of the lithium battery module 1 as a reference, and adjusting the charging voltage of the sodium battery module 3 by a voltage stabilizer 4 electrically connected with the sodium battery module 2, so that the absolute value of the difference between the charging voltage of the sodium battery module 3 and the charging voltage of the lithium battery module 1 is less than M, and M is more than or equal to 0;
in step S102, the required power is the total power required in the charging process. With the charging voltage of the lithium battery module 1 as a reference, the voltage stabilizer 4 adjusts the charging voltage of the sodium battery module 3, so that the charging voltage of the sodium battery module 3 is the same as or approximately the same as the charging voltage of the lithium battery module 1 at any time. M is preferably 0.5V, but is not limited thereto and can be adjusted according to the actual situation.
S103: the power distribution module 5 calculates the charging current of the sodium battery module 3 according to the charging power required by the sodium battery module 3, and calculates the charging current of the lithium battery module 1 according to the charging power required by the lithium battery module 1; the current is transmitted according to the charging current of the sodium electric module 3 and the charging current of the lithium electric module 1.
In step S103, since the charging power of the sodium electric module 3 is equal to the product of the charging current of the sodium electric module 3 and the charging voltage of the sodium electric module 3, the charging current required by the sodium electric module 3 can be obtained by the formula since the charging power and the charging voltage of the sodium electric module 3 are determined. Similarly, because the charging power of the lithium battery module 1 is equal to the product of the charging current of the lithium battery module 1 and the charging voltage of the lithium battery module 1, because the charging power and the charging voltage of the lithium battery module 1 are determined, the charging current required by the lithium battery module 1 can be obtained through the formula.
It can be understood that, when the sodium BATTERY module 3 and the lithium BATTERY module 1 operate simultaneously, the BATTERY management module 8(BATTERY MANAGEMENT SYSTEM, BMS) collects the voltage of the sodium BATTERY module 3 and the lithium BATTERY module 1 in real time, and compares the voltage difference between the two, specifically, the sampling period can be 30mS, or set according to the requirement. Because the voltage range of the sodium electricity module 3 is wider than that of the lithium electricity module 1, the charging front section is boosted and the charging rear section is reduced in voltage in the whole voltage regulation process. The battery management module 8 can control the sodium battery module 3 and the lithium battery module 1 at the same time, and can also calculate the charge states of two types of cells in real time, and the framework of the battery management module 8 can be a master-slave integrated structure, and can also be a three-layer framework, and is not particularly limited here, and other setting modes are also within the protection range of the embodiment. The charging voltage of the sodium electricity module 3 is based on the charging voltage of the lithium electricity module 1, and specifically, the charging voltage of the sodium electricity module 3 is adjusted according to the characteristic curve of the sodium electricity module 3.
Compared with the prior art, the sodium-lithium hybrid battery control method provided by the embodiment has at least the following beneficial effects:
in the sodium-lithium hybrid battery control method provided by the invention, the sodium-electricity module 3 and the lithium-electricity module 1 connected with the sodium-electricity module 3 in parallel run simultaneously, the charging voltage of the sodium-electricity module 3 is adjusted by the voltage stabilizer 4 electrically connected with the sodium-electricity module 2 by taking the charging voltage of the lithium-electricity module 1 as a reference, namely, the sodium-electricity module 3 and the lithium-electricity module 1 are integrated into the same battery system for complementary use, so that the disadvantages of the sodium-electricity module 3 in the aspects of product performance, cycle performance, energy density and the like can be made up, the sodium-electricity module 3 and the lithium-electricity module 1 are mixed for use, and the sodium-electricity module 3 and the lithium-electricity module 1 also have high power and better low-temperature resistance, and the material cost can be reduced.
The battery management module 8 coupled with the sodium electric module 3 and the lithium electric module 1 respectively reads the charge state of the sodium electric module 3 and the charge state of the lithium electric module 1, and calculates the charge amount of the sodium electric module 3 and the charge amount of the lithium electric module 1; the battery management module 8 acquires the required power, calculates the charging power required by the sodium battery module 3 and the charging power required by the lithium battery module 1, and transmits the charging power to the power distribution module 5, one end of the power distribution module is electrically connected with the input bus 6, and the other end of the power distribution module is electrically connected with the sodium battery module 3 and the lithium battery module 1 respectively; taking the charging voltage of the lithium battery module 1 as a reference, and adjusting the charging voltage of the sodium battery module 3 by a voltage stabilizer 4 electrically connected with the sodium battery module 2; the power distribution module 5 calculates the charging current of the sodium battery module 3 according to the charging power required by the sodium battery module 3, and calculates the charging current of the lithium battery module 1 according to the charging power required by the lithium battery module 1; the current is transmitted according to the charging current of the sodium electric module 3 and the charging current of the lithium electric module 1. Control lithium electricity module 1 and sodium electricity module 3 through battery management module 8, each battery module is managed and maintained in the intellectuality, prevents the circumstances of overcharge and overdischarge, prolongs the life of battery, monitors the state of battery.
In some optional embodiments, the battery management module 8 obtains the required power, and calculates the charging power required by the sodium battery module 3 and the charging power required by the lithium battery module 1, including: the ratio of the charging power required by the sodium-electricity module 3 to the charging power required by the lithium-electricity module 1 is equal to the ratio of the charging amount required by the sodium-electricity module 3 to the charging amount required by the lithium-electricity module 1.
It can be understood that, since the product of the electric charge amount and the voltage in the unit time is equal to the electric power, and since the voltage regulator 4 adjusts the voltage of the sodium electric module 3, the voltage of the sodium electric module 3 is equal to or approximately equal to that of the lithium electric module 1, in the case of the same charging time, the electric power required by the sodium electric module 3 is proportional to the required charging amount thereof, that is, the ratio of the charging power required by the sodium electric module 3 to the charging power required by the lithium electric module 1 is equal to the ratio of the charging amount of the sodium electric module 3 to the charging amount of the lithium electric module 1. Of course, this is only one type of calculation for the charging power required for the sodium battery module 3 and the charging power required for the lithium battery module 1, and the calculation is not limited to this, and may be performed by other calculation logics.
In some alternative embodiments, referring to fig. 2 and fig. 3, fig. 3 is a flowchart of a discharging process of the sodium-lithium hybrid battery control method provided by the present invention, where the sodium electrical module 3 and the lithium electrical module 1 operate simultaneously, and the discharging process further includes:
s201: the battery management module 8 respectively reads the charge state of the sodium battery module 3 and the charge state of the lithium battery module 1;
s202: determining a power requirement of an external load;
s203: the power distribution module 5 distributes the output power of the sodium battery module 3 and the output power of the lithium battery module 1;
in step S203, the power distribution module 5 distributes the output power of the sodium electric module 3 and the output power of the lithium electric module 1, where a ratio of the output power required by the sodium electric module 3 to the output power required by the lithium electric module 1 is equal to a ratio of a charge amount of the sodium electric module 3 to a charge amount of the lithium electric module 1, which is only a specific embodiment; the influence of the low-temperature environment on the lithium battery module 1 can also be large, the output current of the lithium battery module 1 can be gradually reduced by the power distribution module 5 according to the low-temperature condition during operation, the output current of the sodium battery module 3 can be gradually increased, the method is not limited to this, and the method that the power distribution module 5 adjusts the power distributed to the sodium battery module 3 and the lithium battery module 1 can be met within the protection range of the embodiment.
S204: the voltage stabilizer 4 takes the discharge voltage of the lithium battery module 1 as a reference, and the voltage stabilizer 4 adjusts the discharge voltage of the sodium battery module 3, so that the absolute value of the difference between the discharge voltage of the sodium battery module 3 and the discharge voltage of the lithium battery module 1 is smaller than M, and M is larger than or equal to 0.
In step S204, M is preferably 0.5 v, but is not limited thereto, and may be adjusted according to actual conditions.
It can be understood that, because the voltage range of the sodium-electricity module 3 is wider than that of the lithium-electricity module 1, the discharging front section reduces the voltage and the discharging rear section increases the voltage in the whole voltage regulation process. Specifically, the sodium battery module 3 adjusts the discharge voltage of the sodium battery module 3 according to the characteristic curve of the sodium battery module 3 with the discharge voltage of the lithium battery module 1 as a reference. Lithium electricity module 1 has voltage platform, and lithium electricity module 1's voltage can not appear great fluctuation at the in-process that discharges promptly, refers to fig. 2, and at the in-process that discharges, sodium electricity module 3's voltage can constantly reduce, consequently, need set up stabiliser 4 and adjust according to sodium electricity module 3's voltage variation characteristic. In some optional embodiments, the power distribution module 5 is controlled to cut off the circuit of the lithium battery module 1 when the battery management module 8 detects that the lithium battery module 1 completes charging, and/or the power distribution module 5 is controlled to cut off the circuit of the sodium battery module 3 when the battery management module 8 detects that the sodium battery module 3 completes charging.
It can be understood that battery management module 8 can accurately read the state of charge of sodium electricity module 3, lithium electricity module 1, helps the follow-up charging current who calculates sodium electricity module 3, lithium electricity module 1, guarantees that the state of charge of sodium electricity module 3 and lithium electricity module 1 after charging is at reasonable within range, avoids overcharging to cause the damage to sodium electricity module 3, lithium electricity module 1.
In some optional embodiments, the power distribution module 5 is controlled to cut off the circuit of the lithium battery module 1 when the battery management module 8 detects that the lithium battery module 1 is discharge-protected, and/or the power distribution module 5 is controlled to cut off the circuit of the sodium battery module 3 when the battery management module 8 detects that the sodium battery module 3 is discharge-protected.
It can be understood that, in the discharging process, the battery management module 8 can collect the terminal voltages and temperatures of the sodium-lithium battery module 3 and the lithium battery module 1 in real time, so as to prevent the sodium-lithium hybrid battery from being over-discharged.
In some alternative embodiments, referring to fig. 4, fig. 4 is a flow chart of a pre-charge process, the charge process further including the pre-charge process;
the pre-charging process comprises the following steps:
s301: when the input bus 6 is conducted, one end of the input bus is electrically connected with the input bus 6, the other end of the input bus is conducted with a pre-charging branch 11 of a pre-charging module 9 electrically connected with the power distribution module 5, and impulse current when the input bus 6 is conducted is adjusted through a pre-charging resistor 14 of the pre-charging branch 11;
s302: turning on the first shunt 10 of the pre-charge module 9 after a first preset time period;
s303: the pre-charge branch 11 is switched off after a second predetermined time period, which is greater than the first predetermined time period.
It can be understood that the pilot pre-charging branch 11 is a means adopted to prevent the starting current from impacting the battery when the input bus 6 is conducted, the pre-charging circuit is conducted at the moment when the input bus 6 is conducted, the impact current at the starting time is adjusted by the pre-charging resistor 14, the first preset time is 3 seconds for example, the first branch 10 is conducted after 3 seconds, the second preset time is 5 seconds for example, the pre-charging branch 11 is cut off after 2 seconds of conducting the first branch 10, and at this time, the battery is charged only through the first branch 10.
In some alternative embodiments, referring to fig. 5, fig. 5 is a flow chart of the fault standby, in which the sodium battery module 3 and the lithium battery module 1 operate simultaneously, and the fault standby is also included;
the fault standby comprises the following steps:
the battery management module 8 sets charge and discharge protection values including a primary protection value, a secondary protection value and a tertiary protection value;
the battery management module 8 respectively reads the states of the lithium battery module 1 and the sodium battery module 3, and when the voltage value of the lithium battery module 1 or the sodium battery module 3 is higher than a primary protection value, the battery management module 8 performs primary alarm;
the battery management module 8 respectively reads the states of the lithium battery module 1 and the sodium battery module 3, and when the voltage value of the lithium battery module 1 or the sodium battery module 3 is higher than a secondary protection value, the battery management module 8 performs secondary alarm, wherein the secondary protection value is larger than a first protection value;
It can be understood that, taking the charging process as an example, the first-level protection value is set to 3.55 v, the second-level protection value is set to 3.6 v, the third-level protection value is set to 3.65 v, the first-level alarm is flashing of the warning lamp, the second-level alarm is flashing of the warning lamp and the power distribution module 5 is cut off at the same time, when the fault delay or the detection value returns to normal, the power distribution module 5 is connected, and the third-level alarm is flashing of the warning lamp and the power distribution module 5 is cut off at the same time, the manual restart is required, that is, the second-level alarm can restore the charging, and the third-level alarm can not restore, and the restart is required after the manual intervention.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a sodium-lithium hybrid battery system provided in the present invention, which illustrates a specific embodiment of the sodium-lithium hybrid battery system provided in the present invention, and includes:
a lithium battery module 1;
the sodium electric module 2, the sodium electric module 2 includes the sodium electric module 3 and stabilizator 4 that connect electrically;
one end of the power distribution module 5 is electrically connected with the input bus 6, the other end of the power distribution module 5 is electrically connected with the anode of the sodium electric module 2 and the anode of the lithium electric module 1 respectively, and the power distribution module 5 is used for shunting the sodium electric module 3 and the lithium electric module 1;
the output bus 7 is electrically connected with the negative electrode of the sodium electric module 2 and the negative electrode of the lithium electric module 1 respectively;
and the battery management module 8 is respectively coupled with the lithium battery module 1, the sodium battery module 3, the voltage stabilizer 4, the power distribution module 5, the input bus 6 and the output bus 7.
It can be understood that, the battery management module 8 is respectively coupled with the lithium battery module 1, the sodium battery module 3, the voltage stabilizer 4, the power distribution module 5, the input bus 6 and the output bus 7, that is, the battery management module 8 can be wirelessly connected with other modules, certainly, other connection modes can be adopted, and the method is not limited thereto, the lithium battery module 1 and the sodium battery module 3 are controlled through the battery management module 8, intelligently manage and maintain each battery module, the situations of overcharge and overdischarge are prevented, the service life of the battery is prolonged, and the state of the battery is monitored. The voltage stabilizer 4 may communicate with the battery management module 8 through a Controller Area Network (CAN) and receive a voltage regulation instruction sent by the battery management module 8. The sodium-lithium hybrid battery system provided by the invention has the advantages that the sodium-lithium hybrid battery system can work independently with the sodium-electricity module 2 and the lithium-electricity module 1 or work simultaneously with the sodium-electricity module 2 and the lithium-electricity module 1. When the sodium electric module 3 is in an independent working state, the lithium electric module 1 and the voltage stabilizer 4 do not work, and the voltage difference between the input bus 6 and the output bus 7 is the voltage of the sodium electric module 3; when the lithium battery module 1 is in an independent working state, the sodium battery module 3 and the voltage stabilizer 4 do not work, and the voltage difference of the input bus 6 and the output bus 7 is the voltage of the lithium battery module 1. Complementary use in integrating into same battery system with sodium electricity module 3 and lithium electricity module 1 can compensate 3 inferior potentials in the aspect of producing property, circulation performance and energy density of sodium electricity module, and sodium electricity module 3 and 1 mixed use of lithium electricity module still have high power, better low temperature resistance ability, can also reduce material cost.
In some optional embodiments, with continued reference to fig. 6, a pre-charging module 9 is further included, where the pre-charging module 9 is located between the power distribution module 5 and the input bus 6, and is electrically connected to the power distribution module 5 at one end and the input bus 6 at the other end;
the battery management module 8 is coupled to the pre-charge module 9.
It will be appreciated that the provision of the pre-charge module 9 between the input bus 6 and the power distribution module 5 prevents the inrush current from impinging on the battery, and that fuses may be provided between the input bus 6 and the power distribution module 5 to protect the battery from over-current due to a fault, which would cause heat to break the line if the current were excessive.
In some alternative examples, referring to fig. 6 and 7, fig. 7 is a circuit diagram of the pre-charge module 9; the pre-charging module 9 comprises a first shunt 10 and a pre-charging shunt 11 which are connected in parallel, wherein the first shunt 10 comprises a first relay 12, and the pre-charging shunt 11 comprises a second relay 13 and a pre-charging resistor 14;
one end of the first relay 12 is electrically connected with the input bus 6, and the other end is electrically connected with the power distribution module 5; a first end of the second relay 13 is electrically connected to the input bus 6, a second end of the second relay 13 is electrically connected to a first end of the pre-charging resistor 14, and a second end of the pre-charging resistor 14 is electrically connected to the power distribution module 5.
It can be understood that fig. 7 only illustrates a circuit diagram of the pre-charge module 9, the selection of the pre-charge resistor 14 can be selected according to actual requirements, and the pre-charge resistor 14 adjusts the inrush current during starting through the pilot-pass pre-charge branch 11, so as to effectively avoid the battery damage caused by the inrush current during starting.
In some optional embodiments, the power distribution module 5 includes a plurality of branches 15, the branches 15 include a third relay 16, a first switch 17 and a second switch 18, and a first end of the third relay 16 is electrically connected to a first end of the first switch 17 and a first end of the second switch 18, respectively;
second ends of the third relays 16 are electrically connected with the input bus 6 after being connected in parallel, second ends of the first switches 17 are electrically connected with the anode of the sodium electric module 2 after being connected in parallel, and second ends of the second switches 18 are electrically connected with the anode of the lithium electric module 1 after being connected in parallel.
It can be understood that, taking the number of the third relays 16 as 10 and each relay passing a current of 1 ampere as an example, if it is calculated that the sodium electrical module 3 needs a current of 7 amperes and the lithium electrical module 1 needs a current of 3 amperes as an example, the requirements can be met by turning on 7 first switches 17 and 3 second switches 18. The above is merely an illustration, and the number and connection manner of the third relays 16, the first switches 17, and the second switches 18 may be set according to actual requirements, but is not limited thereto.
In some alternative embodiments, with continued reference to fig. 6, further comprising a first current collection module 19 and a second current collection module 20 in parallel;
one end of the first current collection module 19 is electrically connected with the cathode of the sodium electric module 2, and the other end is electrically connected with the output bus 7;
one end of the second current collection module 20 is electrically connected with the negative electrode of the lithium battery module 1, and the other end of the second current collection module is electrically connected with the output bus 7;
the battery management module 8 is coupled to the first current collection module 19 and the second current collection module 20 respectively.
It is understood that the first current collection module 19 and the second current collection module 20 are both conventional current collection circuits, and are implemented by hall current sensors or shunts. First current acquisition module 19 gathers the electric current of sodium electricity module 2, and second current acquisition module 20 gathers the electric current of lithium electricity module 1, and first current acquisition module 19, second current acquisition module 20 all are coupled with battery management module 8, help battery management module 8 to accurately acquire the condition of sodium electricity module 3, lithium electricity module 1 and regulate and control.
As can be seen from the above embodiments, the sodium-lithium hybrid battery system and the control method provided by the present invention at least achieve the following beneficial effects:
in the sodium-lithium hybrid battery control method provided by the invention, the sodium-electricity module and the lithium-electricity module connected in parallel with the sodium-electricity module run simultaneously, the charging voltage of the sodium-electricity module is adjusted by the voltage stabilizer electrically connected with the sodium-electricity module by taking the charging voltage of the lithium-electricity module as a reference, namely, the sodium-electricity module and the lithium-electricity module are integrated into the same battery system for complementary use, so that the disadvantages of the sodium-electricity module in the aspects of product performance, cycle performance, energy density and the like can be made up, the sodium-electricity module and the lithium-electricity module are mixed for use, the high power and better low temperature resistance are realized, and the material cost can be reduced. The battery management module coupled with the sodium electric module and the lithium electric module respectively reads the charge state of the sodium electric module and the charge state of the lithium electric module, and calculates the charge amount of the sodium electric module and the charge amount of the lithium electric module; the battery management module acquires required power, calculates charging power required by the sodium battery module and charging power required by the lithium battery module and transmits the charging power to the power distribution module, one end of the power distribution module is electrically connected with the input bus, and the other end of the power distribution module is electrically connected with the sodium battery module and the lithium battery module respectively; taking the charging voltage of the lithium battery module as a reference, and adjusting the charging voltage of the sodium battery module by a voltage stabilizer electrically connected with the sodium battery module; the power distribution module calculates the charging current of the sodium battery module according to the charging power required by the sodium battery module, and calculates the charging current of the lithium battery module according to the charging power required by the lithium battery module; the current is transmitted according to the charging current of the sodium battery module and the charging current of the lithium battery module. Control lithium battery module and sodium battery module through battery management module, each battery module is managed and maintained to the intellectuality, prevents the circumstances of overcharge and overdischarge from appearing, prolongs the life of battery, monitors the state of battery.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A sodium-lithium hybrid battery control method is characterized by comprising the following steps:
sodium electricity module, with the parallelly connected lithium electricity module of sodium electricity module moves simultaneously, including the charging process:
a battery management module coupled with the sodium battery module and the lithium battery module respectively reads the charge state of the sodium battery module and the charge state of the lithium battery module, and calculates the charge amount of the sodium battery module and the charge amount of the lithium battery module;
the battery management module acquires required power, calculates charging power required by the sodium battery module and charging power required by the lithium battery module and transmits the charging power to the power distribution module, wherein one end of the power distribution module is electrically connected with an input bus, and the other end of the power distribution module is electrically connected with the sodium battery module and the lithium battery module respectively; taking the charging voltage of the lithium battery module as a reference, and adjusting the charging voltage of the sodium battery module by a voltage stabilizer electrically connected with the sodium battery module to enable the absolute value of the difference between the charging voltage of the sodium battery module and the charging voltage of the lithium battery module to be less than M, wherein M is more than or equal to 0;
the power distribution module calculates the charging current of the sodium battery module according to the charging power required by the sodium battery module, and calculates the charging current of the lithium battery module according to the charging power required by the lithium battery module; and delivering current according to the charging current of the sodium battery module and the charging current of the lithium battery module.
2. The sodium-lithium hybrid battery control method according to claim 1, wherein the sodium-lithium battery module and the lithium battery module operate simultaneously, and further comprising a discharge process:
the battery management module respectively reads the charge state of the sodium battery module and the charge state of the lithium battery module;
determining a power requirement of an external load;
the power distribution module distributes the output power of the sodium battery module and the output power of the lithium battery module;
the voltage stabilizer adjusts the discharge voltage of the sodium electric module by taking the discharge voltage of the lithium electric module as a reference, so that the absolute value of the difference between the discharge voltage of the sodium electric module and the discharge voltage of the lithium electric module is smaller than M, and M is larger than or equal to 0.
3. The sodium-lithium hybrid battery control method according to claim 1, wherein the battery management module obtains a required power, and calculates a charging power required by the sodium battery module and a charging power required by the lithium battery module, and the method comprises the following steps:
calculating the charging power required by the sodium-electricity module and the charging power required by the lithium-electricity module, so that the ratio of the charging power required by the sodium-electricity module to the charging power required by the lithium-electricity module is equal to the ratio of the charging amount of the sodium-electricity module to the charging amount of the lithium-electricity module.
4. The sodium-lithium hybrid battery control method according to claim 1, wherein the power distribution module is controlled to cut off the circuit of the lithium battery module when the battery management module detects that the lithium battery module is completely charged, and/or the power distribution module is controlled to cut off the circuit of the sodium battery module when the battery management module detects that the sodium battery module is completely charged.
5. The sodium-lithium hybrid battery control method according to claim 1, wherein the charging process further includes a pre-charging process;
the priming process includes:
when the input bus is conducted, one end of the pre-charging branch circuit of the pre-charging module is electrically connected with the input bus, the other end of the pre-charging branch circuit of the pre-charging module is electrically connected with the power distribution module, and the impulse current when the input bus is conducted is adjusted through the pre-charging resistor of the pre-charging branch circuit; conducting a first branch of the pre-charging module after a first preset time period; and cutting off the pre-charging branch after a second preset time period, wherein the second preset time period is greater than the first preset time period.
6. The sodium-lithium hybrid battery control method according to claim 1, wherein the sodium electric module and the lithium electric module operate simultaneously, and further comprising a fault standby mode;
the fault standby comprises:
the battery management module sets a charge and discharge protection value which comprises a primary protection value, a secondary protection value and a tertiary protection value;
the battery management module respectively reads the states of the lithium battery module and the sodium battery module, and when the voltage value of the lithium battery module or the sodium battery module is higher than the primary protection value, the battery management module performs primary alarm;
the battery management module respectively reads the states of the lithium battery module and the sodium battery module, and when the voltage value of the lithium battery module or the sodium battery module is higher than the secondary protection value, the battery management module performs secondary alarm, wherein the secondary protection value is larger than the first protection value;
the battery management module reads the state of the lithium battery module and the state of the sodium battery module respectively, when the voltage value of the lithium battery module or the sodium battery module is higher than the third-level protection value, the battery management module carries out third-level warning, and the third-level protection value is larger than the second protection value.
7. A sodium-lithium hybrid battery system, comprising:
a lithium battery module;
the sodium electric module comprises a sodium electric module and a voltage stabilizer which are electrically connected;
one end of the power distribution module is electrically connected with the input bus, the other end of the power distribution module is electrically connected with the anode of the sodium electric module and the anode of the lithium electric module respectively, and the power distribution module is used for shunting the sodium electric module and the lithium electric module;
the output bus is electrically connected with the negative electrode of the sodium electric module and the negative electrode of the lithium electric module respectively;
the battery management module is respectively coupled with the lithium battery module, the sodium battery module, the voltage stabilizer, the power distribution module, the input bus and the output bus.
8. The sodium-lithium hybrid battery system according to claim 7, further comprising a pre-charge module positioned between the power distribution module and the input bus, one end of the pre-charge module being electrically connected to the power distribution module and the other end being electrically connected to the input bus;
the battery management module is coupled with the pre-charge module.
9. The sodium-lithium hybrid battery system of claim 8, wherein the pre-charge module comprises a first shunt and a pre-charge shunt connected in parallel, the first shunt comprising a first relay, the pre-charge shunt comprising a second relay and a pre-charge resistor;
one end of the first relay is electrically connected with the input bus, and the other end of the first relay is electrically connected with the power distribution module; the first end of the second relay is electrically connected with the input bus, the second end of the second relay is electrically connected with the first end of the pre-charging resistor, and the second end of the pre-charging resistor is electrically connected with the power distribution module.
10. The sodium-lithium hybrid battery system according to claim 7, wherein the power distribution module comprises a plurality of branches, the branches comprising a third relay, a first switch, and a second switch, a first end of the third relay being electrically connected to a first end of the first switch and a first end of the second switch, respectively;
the second ends of the plurality of third relays are connected in parallel and then electrically connected with the input bus, the second ends of the plurality of first switches are connected in parallel and then electrically connected with the positive electrode of the sodium electric module, and the second ends of the plurality of second switches are connected in parallel and then electrically connected with the positive electrode of the lithium electric module.
11. The sodium-lithium hybrid battery system according to claim 7, further comprising a first current collection module and a second current collection module in parallel;
one end of the first current acquisition module is electrically connected with the negative electrode of the sodium electric module, and the other end of the first current acquisition module is electrically connected with the output bus;
one end of the second current collection module is electrically connected with the negative electrode of the lithium battery module, and the other end of the second current collection module is electrically connected with the output bus;
the battery management module is coupled with the first current collection module and the second current collection module respectively.
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