CN114566725B - Sodium-lithium hybrid battery system and control method - Google Patents
Sodium-lithium hybrid battery system and control method Download PDFInfo
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- CN114566725B CN114566725B CN202210153033.4A CN202210153033A CN114566725B CN 114566725 B CN114566725 B CN 114566725B CN 202210153033 A CN202210153033 A CN 202210153033A CN 114566725 B CN114566725 B CN 114566725B
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- 238000000034 method Methods 0.000 title claims abstract description 49
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 196
- 239000011734 sodium Substances 0.000 claims abstract description 196
- 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 194
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 175
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 174
- 238000009826 distribution Methods 0.000 claims abstract description 64
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 7
- 230000037452 priming Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 208000028659 discharge Diseases 0.000 description 15
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000007363 regulatory process Effects 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression 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
- 238000012423 maintenance Methods 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
- 238000005070 sampling Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a sodium-lithium hybrid battery system and a control method, wherein the sodium-lithium hybrid battery control method comprises the following steps: the battery management module obtains the required power, calculates the charging power required by the sodium electric module and the charging power required by the lithium electric module and transmits the charging power to the power distribution module; taking the charging voltage of the lithium battery module as a reference, and regulating the charging voltage of the sodium battery module by the voltage stabilizer; the power distribution module calculates the charging current of the sodium electric module according to the charging power required by the sodium electric module, and calculates the charging current of the lithium electric module according to the charging power required by the lithium electric module; and conveying current according to the charging current of the sodium electric module and the charging current of the lithium electric module. The sodium electric module and the lithium electric module are integrated into the same battery system for complementary use, so that the disadvantages of the sodium electric module in terms of product performance, cycle performance, energy density and the like can be overcome, and the sodium electric module and the lithium electric module are mixed for use, have high power and better low temperature resistance, and can also reduce material cost.
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 assembled battery is to weld and assemble the battery pack, connect a plurality of battery cells in series or in parallel through welding equipment, and assemble the assembled battery by adding accessories such as a battery protection plate, a battery shell and the like to obtain the assembled battery product. Assembled batteries require a high degree of uniformity in the battery, i.e., uniformity in capacity, internal resistance, voltage, discharge curve, and life, etc., and therefore, in the prior art, the same battery is generally used for assembly, e.g., integrated application of lithium iron phosphate batteries, integrated application of ternary lithium batteries, or integrated sodium electrical system.
The lithium battery and the sodium battery have certain advantages and disadvantages, and the cycle performance, the charge-discharge multiplying power and the energy density of the lithium battery are better, but the low-temperature performance of the lithium battery is poorer, and the cost is higher; the sodium battery has poor cycle performance and energy density, but the sodium battery has good safety and low-temperature performance, and the sodium battery has low cost, thereby being beneficial to large-scale development.
Therefore, a system and control method that enables the mixed use of sodium and lithium batteries is 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 invention provides a sodium-lithium hybrid battery control method, comprising the following steps:
sodium electric module, with sodium electric module parallelly connected lithium electricity module simultaneous operation, including the charging process:
the battery management module is coupled with the sodium electric module and the lithium electric module and 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 obtains the required power, calculates the charging power required by the sodium electric module and the charging power required by the lithium electric module, and transmits the charging power to the power distribution module, wherein one end of the power distribution module is electrically connected with the input bus, and the other end of the power distribution module is respectively electrically connected with the sodium electric module and the lithium electric module; taking the charging voltage of the lithium battery module as a reference, and regulating the charging voltage of the sodium battery module by a voltage regulator electrically connected with the sodium battery module, so that the absolute value of the difference between the charging voltage of the sodium battery module and the charging voltage of the lithium battery module is smaller than M, and M is more than or equal to 0;
the power distribution module calculates the charging current of the sodium electric module according to the charging power required by the sodium electric module, and calculates the charging current of the lithium electric module according to the charging power required by the lithium electric module; and conveying current according to the charging current of the sodium electric module and the charging current of the lithium electric module.
On the other hand, the invention also provides a sodium-lithium hybrid battery system, which comprises:
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 respectively electrically connected with the positive electrode of the sodium electric module and the positive electrode of the lithium electric module, and the power distribution module is used for shunting the sodium electric module and the lithium electric module;
the output bus is respectively and electrically connected with the negative electrode of the sodium electric module and the negative electrode of the lithium electric module;
and 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 have the advantages that at least the following beneficial effects are realized:
according to 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 operate simultaneously, and the charging voltage of the sodium-electricity module is used as a reference, so that the voltage stabilizer electrically connected with the sodium-electricity module adjusts the charging voltage of the sodium-electricity module, 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 terms of product performance, cycle performance, energy density and the like can be overcome, and the mixed use of the sodium-electricity module and the lithium-electricity module also has high power, better low-temperature resistance and material cost reduction.
The battery management module is coupled with the sodium electric module and the lithium electric module and 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 obtains the required power, calculates the charging power required by the sodium electric module and the charging power required by the lithium electric module, and transmits the charging power to the power distribution module, wherein one end of the power distribution module is electrically connected with the input bus, and the other end of the power distribution module is respectively electrically connected with the sodium electric module and the lithium electric module; taking the charging voltage of the lithium battery module as a reference, and regulating 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 electric module according to the charging power required by the sodium electric module, and calculates the charging current of the lithium electric module according to the charging power required by the lithium electric module; and conveying current according to the charging current of the sodium electric module and the charging current of the lithium electric module. The lithium battery module and the sodium battery module are controlled through the battery management module, the battery modules are intelligently managed and maintained, overcharge and overdischarge are prevented from occurring, the service life of the battery is prolonged, and the state of the battery is monitored.
Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, 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 flowchart of a charging process of a sodium-lithium hybrid battery control method provided by the invention;
FIG. 2 shows the charge-discharge characteristic of the sodium-electric module;
FIG. 3 is a flow chart of a discharging process of the sodium lithium hybrid battery control method provided by the invention;
FIG. 4 is a flow chart of a priming process;
FIG. 5 is a flow chart of fault standby;
fig. 6 is a schematic structural diagram of a sodium-lithium hybrid battery system according to the present invention;
FIG. 7 is a circuit diagram of a priming module;
FIG. 8 is a circuit diagram of a power distribution module;
the lithium battery module 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, an 8-battery management module, a 9-pre-charging module, a 10-first shunt, a 11-pre-charging shunt, a 12-first relay, a 13-second relay, a 14-pre-charging resistor, a 15-branch, a 16-third relay, a 17-first switch, a 18-second switch, a 19-first current acquisition module and a 20-second current acquisition 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, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one 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 specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Referring to fig. 1 and 2, fig. 1 is a flowchart of a charging process of a sodium-lithium hybrid battery control method according to the present invention; fig. 2 is a charge-discharge characteristic curve of the sodium-lithium hybrid battery 3, illustrating a specific embodiment of the sodium-lithium hybrid battery control method provided by the invention, including:
sodium electric module 3, with the parallelly connected lithium electricity module 1 simultaneous operation of sodium electric module 3, including the charging process:
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 obtains the required power, calculates the charging power required by the sodium electric module 3 and the charging power required by the lithium electric module 1, and transmits the charging power to the power distribution module 5, one end of which is electrically connected with the input bus 6, and the other end of which is electrically connected with the sodium electric module 3 and the lithium electric module 1 respectively; taking the charging voltage of the lithium battery module 1 as a reference, a voltage stabilizer 4 electrically connected with the sodium battery module 2 adjusts the charging voltage of the sodium battery module 3, 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 smaller 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. Based on the charging voltage of the lithium battery module 1, 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 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 practical situations.
S103: the power distribution module 5 calculates the charging current of the sodium electric module 3 according to the charging power required by the sodium electric module 3, and calculates the charging current of the lithium electric module 1 according to the charging power required by the lithium electric 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 because 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, the charging current required by the lithium battery module 1 can be obtained through a formula because the charging power and the charging voltage of the lithium battery module 1 are determined.
It can be understood that when the BATTERY management module 8 (BATTERY MANAGEMENT SYSTEM, BMS) operates simultaneously with the sodium electric module 3 and the lithium electric module 1, the voltages of the sodium electric module 3 and the lithium electric module 1 are collected in real time, and compared with the voltage difference between the two, the sampling period can be specifically 30mS, or set according to the requirement. Because the voltage range of the sodium electric module 3 is wider than that of the lithium electric module 1, the voltage of the charging front section is increased and the voltage of the charging rear section is reduced in the whole voltage regulating process. The battery management module 8 can control the sodium electric module 3 and the lithium electric module 1 at the same time, can also calculate the charge states of the two electric cores in real time, and the architecture of the battery management module 8 can be a master-slave integrated type or a three-layer architecture, so that specific limitations are not made here, and other setting modes are also within the protection scope of the embodiment. The charging voltage of the sodium electric module 3 is based on the charging voltage of the lithium electric module 1, specifically, the charging voltage of the sodium electric module 3 is adjusted according to the characteristic curve of the sodium electric 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:
according to the sodium-lithium hybrid battery control method provided by the invention, the sodium electric module 3 and the lithium electric module 1 connected with the sodium electric module 3 in parallel are operated simultaneously, the charging voltage of the sodium electric module 3 is regulated by the voltage regulator 4 electrically connected with the sodium electric module 2 based on the charging voltage of the lithium electric module 1, namely the sodium electric module 3 and the lithium electric module 1 are integrated into the same battery system for complementary use, so that the disadvantages of the sodium electric module 3 in terms of product performance, cycle performance, energy density and the like can be overcome, and the mixed use of the sodium electric module 3 and the lithium electric module 1 also has high power, better low temperature resistance and material cost reduction.
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 obtains the required power, calculates the charging power required by the sodium electric module 3 and the charging power required by the lithium electric module 1, and transmits the charging power to the power distribution module 5, one end of which is electrically connected with the input bus 6, and the other end of which is electrically connected with the sodium electric module 3 and the lithium electric module 1 respectively; taking the charging voltage of the lithium battery module 1 as a reference, and regulating 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 electric module 3 according to the charging power required by the sodium electric module 3, and calculates the charging current of the lithium electric module 1 according to the charging power required by the lithium electric 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. The lithium battery module 1 and the sodium battery module 3 are controlled through the battery management module 8, the intelligent management and maintenance of the battery modules are realized, the overcharge and overdischarge conditions are prevented, the service life of the battery is prolonged, and the state of the battery is monitored.
In some alternative embodiments, the battery management module 8 obtains the required power, calculates the charging power required by the sodium electric module 3 and the charging power required by the lithium electric module 1, including: 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 required by the sodium electric module 3 to the charging amount required by the lithium electric module 1.
It can be understood that, since the product of the amount of charge and the voltage in a unit time is equal to the electric power, and since the voltage regulator 4 regulates the voltage of the sodium electric module 3, the voltage of the sodium electric module 3 and the voltage of the lithium electric module 1 are equal or approximately equal, and in the case that the charging time is the same, the electric power required by the sodium electric module 3 is proportional to the amount of charge required by the sodium electric module 3, that is, the ratio of the amount of charge required by the sodium electric module 3 to the amount of charge required by the lithium electric module 1 is equal to the ratio of the amount of charge of the sodium electric module 3 to the amount of charge of the lithium electric module 1. Of course, this is just one way of calculating the charging power required by the sodium module 3 and the charging power required by the lithium module 1, and is not limited thereto, but may be calculated by other calculation logic.
In some alternative embodiments, referring to fig. 2 and 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-electricity module 3 and the lithium-electricity module 1 operate simultaneously, and the discharging process further includes:
s201: the battery management module 8 reads the charge state of the sodium battery module 3 and the charge state of the lithium battery module 1 respectively;
s202: determining a power demand of an external load;
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;
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 may be that the 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 the ratio of the charge amount of the sodium electric module 3 to the charge amount of the lithium electric module 1, which is just a specific embodiment; the influence of the low-temperature environment on the lithium battery module 1 may be larger, and when the lithium battery module 1 is operated, the output current of the lithium battery module 1 may be gradually reduced by the power distribution module 5 according to the low-temperature condition, and the output current of the sodium battery module 3 may be gradually increased, which is not limited thereto, and the power distribution module 5 may be capable of adjusting the power distributed to the sodium battery module 3 and the lithium battery module 1.
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 more 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 practical situations.
It can be understood that, since the voltage range of the sodium electric module 3 is wider than that of the lithium electric module 1, the voltage of the front discharge stage is reduced and the voltage of the rear discharge stage is increased in the whole voltage regulating process. Specifically, the sodium electric module 3 uses the discharge voltage of the lithium electric module 1 as a reference, and adjusts the discharge voltage of the sodium electric module 3 according to the characteristic curve of the sodium electric module 3. The lithium battery module 1 has a voltage platform, that is, the voltage of the lithium battery module 1 does not have larger fluctuation in the discharging process, referring to fig. 2, the voltage of the sodium battery module 3 is continuously reduced in the discharging process, and therefore, the voltage stabilizer 4 needs to be set to adjust according to the voltage variation characteristic of the sodium battery module 3. In some alternative embodiments, the power distribution module 5 is controlled to cut off the electrical circuit of the lithium ion battery module 1 when the battery management module 8 detects that the lithium ion battery module 1 is charged, and/or the power distribution module 5 is controlled to cut off the electrical circuit of the sodium ion battery module 3 when the battery management module 8 detects that the sodium ion battery module 3 is charged.
It can be understood that the battery management module 8 can accurately read the charge states of the sodium electric module 3 and the lithium electric module 1, which is helpful for calculating the charge current of the sodium electric module 3 and the lithium electric module 1, ensuring that the charge states of the charged sodium electric module 3 and lithium electric module 1 are in a reasonable range, and avoiding the damage to the sodium electric module 3 and the lithium electric module 1 caused by overcharge.
In some alternative 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 discharge protection of the lithium battery module 1, 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 discharge protection of the sodium battery module 3.
It can be understood that, in the discharging process, the battery management module 8 can collect the terminal voltage and the temperature of the sodium-electricity module 3 and the lithium-electricity module 1 in real time, so as to prevent the overdischarge of the sodium-lithium hybrid battery.
In some alternative embodiments, referring to fig. 4, fig. 4 is a flow chart of a pre-charging process, the charging process further comprising a pre-charging process;
the pre-charging process comprises:
s301: when the input bus 6 is conducted, one end of the pre-charging resistor is electrically connected with the input bus 6, the pre-charging path 11 of the pre-charging module 9, the other end of which is electrically connected with the power distribution module 5, is conducted, and the impact current when the input bus 6 is conducted is regulated through the pre-charging resistor 14 of the pre-charging path 11;
s302: after a first preset period of time, the first shunt 10 of the pre-charging module 9 is turned on;
s303: the pre-charge branch 11 is cut off after a second preset period of time, which is greater than the first preset period of time.
It will be appreciated that when the input bus 6 is turned on, the pre-full path 11 is turned on first, so as to prevent the starting current from striking the battery, the pre-charging loop is turned on at the instant when the input bus 6 is turned on, the striking current at the time of starting is regulated by the pre-charging resistor 14, the first shunt 10 is turned on after 3 seconds for example, the first preset time is 5 seconds for example, after 2 seconds for turning on the first shunt 10, the pre-full path 11 is cut off, and the battery is charged only by the first shunt 10 at this time.
In some alternative embodiments, referring to fig. 5, fig. 5 is a flowchart of fault standby, where the sodium electric module 3 and the lithium electric module 1 operate simultaneously, and further includes fault standby;
the fault standby comprises:
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 reads the states of the lithium battery module 1 and the sodium battery module 3 respectively, 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 carries out 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 second protection value, the battery management module 8 carries out second-level alarming, and the second protection value is larger than the first protection value;
the battery management module 8 reads the states of the lithium battery module 1 and the sodium battery module 3 respectively, and when the voltage value of the lithium battery module 1 or the sodium battery module 3 is higher than the three-level protection value, the battery management module 8 carries out three-level alarm, and the three-level protection value is larger than the second protection value.
It will be appreciated that taking the charging process as an example, the primary protection value is 3.55 v, the secondary protection value is 3.6 v, the tertiary protection value is 3.65 v, the primary alarm is the flashing of the warning lamp, the secondary alarm is the 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 be normal, the power distribution module 5 is connected, the tertiary alarm is the flashing of the warning lamp, and the power distribution module 5 is cut off at the same time, a manual restart is required, that is, the secondary alarm can be charged again, the tertiary alarm cannot be recovered, and a manual dry restart is required.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a sodium-lithium hybrid battery system provided by the present invention, illustrating a specific embodiment of a sodium-lithium hybrid battery system provided by the present invention, including:
a lithium battery module 1;
the sodium electric module 2, wherein the sodium electric module 2 comprises a sodium electric module 3 and a voltage stabilizer 4 which are electrically connected;
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 respectively electrically connected with the positive electrode of the sodium electric module 2 and the positive electrode of the lithium electric module 1, 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 respectively and electrically connected with the negative electrode of the sodium electric module 2 and the negative electrode of the lithium electric module 1;
the battery management module 8 is 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 respectively.
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 in wireless connection with other modules, and of course, other connection modes can be also adopted, and the battery management module 8 is not limited to the connection modes, and controls the lithium battery module 1 and the sodium battery module 3, intelligently manages and maintains each battery module, prevents the overcharge and overdischarge conditions, prolongs the service life of the battery, and monitors the state of the battery. The voltage stabilizer 4 may be in communication with the battery management module 8 through a controller area network (Controller Area Network, CAN) and receives a voltage regulation command sent by the battery management module 8. The sodium-lithium hybrid battery system provided by the invention can be used for independently working the sodium-lithium hybrid battery module 2 and the lithium battery module 1 or simultaneously working the sodium-lithium hybrid battery module 2 and the lithium battery 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 between the input bus 6 and the output bus 7 is the voltage of the lithium battery module 1. The sodium electric module 3 and the lithium electric module 1 are integrated into the same battery system for complementary use, so that the disadvantages of the sodium electric module 3 in terms of product performance, cycle performance, energy density and the like can be overcome, and the sodium electric module 3 and the lithium electric module 1 are mixed for use, so that the lithium battery system has high power, better low temperature resistance and material cost reduction.
In some alternative embodiments, with continued reference to fig. 6, further comprising a pre-charge module 9, the pre-charge module 9 being located between the power distribution module 5 and the input bus 6, one end being electrically connected to the power distribution module 5, the other end being electrically connected to the input bus 6;
the battery management module 8 is coupled with 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 start-up current from striking the battery, and that a fuse may be provided between the input bus 6 and the power distribution module 5 to protect the battery from excessive current due to faults, and that heat is generated to break the line when the current is excessive.
In some alternative examples, referring to fig. 6 and 7, fig. 7 is a circuit diagram of the priming module 9; the pre-charging module 9 comprises a first shunt 10 and a pre-full circuit 11 which are connected in parallel, 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; the first end of the second relay 13 is electrically connected to the input bus 6, the second end of the second relay 13 is electrically connected to the first end of the pre-charge resistor 14, and the second end of the pre-charge resistor 14 is electrically connected to the power distribution module 5.
It can be understood that, in fig. 7, only a circuit diagram of one type of pre-charging module 9 is illustrated, the pre-charging resistor 14 can be selected according to actual requirements, and the pre-charging resistor 14 can effectively avoid damage to the battery caused by the impact current during starting by firstly conducting the pre-charging circuit 11 and adjusting the impact current during starting.
In some alternative embodiments, the power distribution module 5 includes a plurality of branches 15, the branches 15 including a third relay 16, a first switch 17, and a second switch 18, the first end of the third relay 16 being electrically connected to the first end of the first switch 17, the first end of the second switch 18, respectively;
the second ends of the third relays 16 are electrically connected with the input bus 6 after being connected in parallel, the second ends of the first switches 17 are electrically connected with the positive electrode of the sodium electric module 2 after being connected in parallel, and the second ends of the second switches 18 are electrically connected with the positive electrode of the lithium electric module 1 after being connected in parallel.
It will be appreciated that taking 10 third relays 16, each of which passes 1 ampere of current as an example, if it is calculated that 7 amperes of current is required by the sodium module 3, and 3 amperes of current is required by the lithium module 1 as an example, 7 first switches 17 and 3 second switches 18 are turned on to meet the requirement. The above is merely illustrative, and the number and connection manners of the third relay 16, the first switch 17, and the second switch 18 may be set according to actual requirements, and are not limited thereto.
In some alternative embodiments, with continued reference to fig. 6, further comprising a first current acquisition module 19 and a second current acquisition module 20 in parallel;
one end of the first current acquisition module 19 is electrically connected with the negative electrode of the sodium electric module 2, and the other end of the first current acquisition module is electrically connected with the output bus 7;
one end of the second current acquisition module 20 is electrically connected with the negative electrode of the lithium battery module 1, and the other end of the second current acquisition 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 collecting module 19 and the second current collecting module 20 are conventional current collecting circuits, and are implemented by hall current sensors or shunts. The first current collection module 19 collects the current of the sodium electric module 2, the second current collection module 20 collects the current of the lithium electric module 1, the first current collection module 19 and the second current collection module 20 are both coupled with the battery management module 8, and the battery management module 8 is helped to accurately obtain the conditions of the sodium electric module 3 and the lithium electric module 1 and regulate and control.
According to the embodiment, the sodium-lithium hybrid battery system and the control method provided by the invention have the following beneficial effects:
according to 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 operate simultaneously, and the charging voltage of the sodium-electricity module is used as a reference, so that the voltage stabilizer electrically connected with the sodium-electricity module adjusts the charging voltage of the sodium-electricity module, 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 terms of product performance, cycle performance, energy density and the like can be overcome, and the mixed use of the sodium-electricity module and the lithium-electricity module also has high power, better low-temperature resistance and material cost reduction. The battery management module is coupled with the sodium electric module and the lithium electric module and 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 obtains the required power, calculates the charging power required by the sodium electric module and the charging power required by the lithium electric module, and transmits the charging power to the power distribution module, wherein one end of the power distribution module is electrically connected with the input bus, and the other end of the power distribution module is respectively electrically connected with the sodium electric module and the lithium electric module; taking the charging voltage of the lithium battery module as a reference, and regulating 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 electric module according to the charging power required by the sodium electric module, and calculates the charging current of the lithium electric module according to the charging power required by the lithium electric module; and conveying current according to the charging current of the sodium electric module and the charging current of the lithium electric module. The lithium battery module and the sodium battery module are controlled through the battery management module, the battery modules are intelligently managed and maintained, overcharge and overdischarge are prevented from occurring, the service life of the battery is prolonged, and the state of the battery is monitored.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the 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, characterized by comprising:
sodium electric module, with sodium electric module parallelly connected lithium electricity module simultaneous operation, including the charging process:
the battery management module is coupled with the sodium electric module and the lithium electric module and 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 obtains the required power, calculates the charging power required by the sodium electric module and the charging power required by the lithium electric module, and transmits the charging power to the power distribution module, wherein one end of the power distribution module is electrically connected with the input bus, and the other end of the power distribution module is respectively electrically connected with the sodium electric module and the lithium electric module; taking the charging voltage of the lithium battery module as a reference, and regulating the charging voltage of the sodium battery module by a voltage regulator electrically connected with the sodium battery module, so that the absolute value of the difference between the charging voltage of the sodium battery module and the charging voltage of the lithium battery module is smaller than M, and M is more than or equal to 0;
the power distribution module calculates the charging current of the sodium electric module according to the charging power required by the sodium electric module, and calculates the charging current of the lithium electric module according to the charging power required by the lithium electric module; and conveying current according to the charging current of the sodium electric module and the charging current of the lithium electric module.
2. The sodium-lithium hybrid battery control method according to claim 1, wherein the sodium-electricity module and the lithium-electricity module are operated simultaneously, further comprising a discharging process:
the battery management module is used for respectively reading the charge state of the sodium battery module and the charge state of the lithium battery module;
determining a power demand of an external load;
the power distribution module distributes the output power of the sodium electric module and the output power of the lithium electric module;
and the voltage stabilizer is used for adjusting 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 more than or equal to 0.
3. The method of claim 1, wherein the battery management module obtains the required power, calculates the charging power required by the sodium-electric module and the charging power required by the lithium-electric module, and comprises:
and calculating the charging power required by the sodium electric module and the charging power required by the lithium electric module, so that the ratio of the charging power required by the sodium electric module to the charging power required by the lithium electric module is equal to the ratio of the charging amount of the sodium electric module to the charging amount of the lithium electric module.
4. The sodium-lithium hybrid battery control method according to claim 1, wherein the power distribution module is controlled to cut off a circuit of the lithium battery module when the battery management module detects that the lithium battery module is charged, and/or the power distribution module is controlled to cut off a circuit of the sodium battery module when the battery management module detects that the sodium battery module is charged.
5. The sodium lithium hybrid battery control method according to claim 1, wherein the charging process further comprises a pre-charging process;
the priming process includes:
when the input bus is conducted, one end of the input bus is electrically connected with the input bus, the other end of the input bus is electrically connected with a pre-full path of a pre-charging module, and the impact current of the input bus when the input bus is conducted is regulated through a pre-charging resistor of the pre-charging shunt; switching on a first shunt of the pre-charging module after a first preset period of time; and cutting off the pre-sufficient road 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-electricity module and the lithium-electricity module operate simultaneously, and further comprising a fault standby;
the fault standby includes:
the battery management module is provided with charge and discharge protection values, including 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 carries out 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 second protection value, the battery management module carries out second-level alarming, and the second protection value is larger than the first 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 three-level protection value, the battery management module carries out three-level alarm, and the three-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 positive electrode of the sodium electric module and the positive electrode 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 respectively and electrically connected with the negative electrode of the sodium electric module and the negative electrode of the lithium electric module;
and 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 of claim 7, further comprising a pre-charge module positioned between the power distribution module and the input bus, one end 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 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 of 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, the first end of the third relay being electrically connected to the first end of the first switch, the first end of the second switch, respectively;
the second ends of the third relays are connected in parallel and then are electrically connected with the input bus, the second ends of the first switches are connected in parallel and then are electrically connected with the positive electrode of the sodium electric module, and the second ends of the second switches are connected in parallel and then are electrically connected with the positive electrode of the lithium electric module.
11. The sodium lithium hybrid battery system of 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 acquisition module is electrically connected with the negative electrode of the lithium battery module, and the other end of the second current acquisition module is electrically connected with the output bus;
the battery management module is coupled with the first current acquisition module and the second current acquisition module respectively.
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