CN113437787A - Battery equalization system, method, terminal and storage medium - Google Patents
Battery equalization system, method, terminal and storage medium Download PDFInfo
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- CN113437787A CN113437787A CN202010143327.XA CN202010143327A CN113437787A CN 113437787 A CN113437787 A CN 113437787A CN 202010143327 A CN202010143327 A CN 202010143327A CN 113437787 A CN113437787 A CN 113437787A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
Abstract
The embodiment of the application provides a battery equalization system, a battery equalization method, a terminal and a storage medium, relates to a battery management technology of a vehicle, and is used for solving the problems of large circuit size and high cost caused by a large number of transformers in the related technology. Wherein, battery equalizing system includes: the transmitting terminal is provided with an inverter, a constant voltage power supply, a transmitting coil and a transmitting capacitor which are connected in series; each receiving end is provided with a receiving coil, a bidirectional switch, a receiving capacitor and a rectifier which are connected in series; each receiving end is used for being electrically connected with a single battery; the receiving coil of each receiving end is used for mutual inductance with the transmitting coil of the transmitting end; the control module is used for determining the single batteries to be balanced in the battery pack, controlling the bidirectional switch electrically connected with the single batteries to be balanced to be switched on, and controlling the bidirectional switch to be switched off when the single batteries to be balanced reach a balanced state.
Description
Technical Field
The present disclosure relates to a battery management technology of a vehicle, and in particular, to a battery balancing system, a battery balancing method, a terminal, and a storage medium.
Background
Battery equalization is an important means for realizing battery management in an energy storage system; the method is a technical means for transferring the excess energy to the monomer with the insufficient energy and improving the inconsistency among the battery monomers by peak clipping and valley filling.
Because the lithium ion battery is strictly prohibited from being overcharged in the use process, most of series lithium ion battery packs adopt an active equalization method to realize the equalization among all battery monomers. In the related art, a second-order equalization topology of cells to the entire battery pack is generally adopted. The first-stage circuit is used for achieving the over-charge discharging function, specifically, each battery cell is connected with one flyback converter, and therefore redundant energy in the over-charge cells is discharged to a capacitor of the common output independently. The second-order flyback converter circuit feeds energy back to the whole battery pack. The balance structure can effectively prevent the battery from being overcharged and can solve the problem of high voltage stress of a power device in a circuit. However, the circuit is bulky and costly due to the large number of transformers employed.
Disclosure of Invention
The embodiment of the application provides a battery equalization system, a battery equalization method, a terminal and a storage medium, which are used for solving the problems of large circuit size and high cost caused by the adoption of a large number of transformers in the related art.
An embodiment of a first aspect of the present application provides a battery balancing system, including:
the transmitting terminal is provided with an inverter, a constant voltage power supply, a transmitting coil and a transmitting capacitor which are connected in series;
each receiving end is provided with a receiving coil, a bidirectional switch, a receiving capacitor and a rectifier which are connected in series; each receiving end is used for being electrically connected with a single battery; the receiving coil of each receiving end is used for mutual inductance with the transmitting coil of the transmitting end;
the control module is used for determining the single batteries to be balanced in the battery pack, controlling the bidirectional switch electrically connected with the single batteries to be balanced to be switched on, and controlling the bidirectional switch to be switched off when the single batteries to be balanced reach a balanced state.
In one possible implementation manner, the battery balancing system further includes a detection unit, where the detection unit is configured to detect a terminal voltage of the battery cell; the control module is used for determining the single batteries to be balanced in the battery pack according to the detection structure of the detection piece.
In one possible implementation, the bidirectional switches are distributed in a matrix.
In one possible implementation manner, the output end and the input end of the constant voltage power supply are respectively electrically connected with the inverter.
In one possible implementation, the bidirectional switch is a MOSFET switch.
In one possible implementation, the control module is a digital signal processor.
In one possible implementation manner, the control module is configured to determine a variance between a terminal voltage of the battery cell and a preset standard value, compare the variance with a threshold, determine that the battery cell is a battery cell to be balanced when the variance is greater than or equal to the threshold, and determine that the battery cell is in a balanced state when the variance is less than the threshold.
An embodiment of a second aspect of the present application provides a battery balancing method, including:
acquiring terminal voltage of each battery monomer in the battery pack;
determining the single batteries to be balanced according to the terminal voltage of each single battery;
and controlling a bidirectional switch electrically connected with the battery monomer to be balanced to be switched on, and controlling the bidirectional switch to be switched off when the battery monomer to be balanced reaches a balanced state.
In one possible implementation manner, the determining the battery cells to be equalized according to the terminal voltages of the battery cells includes:
determining the variance of the terminal voltage of the battery monomer and a preset standard value;
comparing the variance with a threshold, and if the variance is greater than or equal to the threshold, determining that the battery monomer is a battery monomer to be balanced;
the battery equalization method further comprises the following steps: and if the variance between the terminal voltage of the single battery and a preset standard value is smaller than a threshold value, determining that the single battery is in a balanced state.
In one possible implementation manner, after determining the battery cells to be equalized according to the terminal voltages of the battery cells, the method further includes:
sequencing the battery monomers to be balanced;
the control with the two-way switch who treats balanced battery monomer electricity is connected switches on, includes:
and controlling the conduction of a bidirectional switch electrically connected with the battery monomer to be balanced according to the arranged sequence.
An embodiment of a third aspect of the present application provides a terminal, including:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement a method as claimed in any preceding claim.
A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement a method as claimed in any preceding claim.
The embodiment of the application provides a battery equalization system, a battery equalization method, a terminal and a storage medium, wherein the battery equalization system comprises a receiving end and a transmitting end, the receiving end and the transmitting end both adopt SS topological structures, the system is simple in structure, the size and the weight of the system are favorably reduced, the system cost is reduced, energy can be directly transmitted to low-voltage batteries at any position from the receiving end, single battery equalization or multi-battery series equalization is realized, and the balance speed is favorably improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a battery equalization system according to an exemplary embodiment;
fig. 2 is a schematic structural diagram of a topology circuit formed by a receiving end and a transmitting end according to the present exemplary embodiment;
FIG. 3 is a schematic diagram of a topology circuit provided in the present exemplary embodiment in state 1;
FIG. 4 is a schematic diagram of the topology circuit provided in this exemplary embodiment in state 2;
fig. 5 is an equivalent circuit schematic diagram of the topology circuit in state 2 according to the present exemplary embodiment;
fig. 6 is a schematic flow chart of a battery equalization method according to the present exemplary embodiment.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In order to solve the problems of energy crisis, environmental pollution and the like, new energy sources are generated at the same time. As a green energy storage power source, the cell voltage of a lithium ion battery is usually around 3.3V, and many battery suppliers have made efforts to increase the battery voltage and the battery capacity for higher power and energy density, however, the cell voltage and the battery capacity are still limited due to chemical characteristics and structural problems. Therefore, in order to meet the high voltage requirements of the application, the cells need to be connected in series. However, when the battery is repeatedly charged or discharged, the battery has inevitable differences in chemical and electrical characteristics due to initial capacity differences of the respective batteries, asymmetry in damping characteristics, unevenness in temperature distribution, and the like, resulting in charge and discharge imbalance. When the battery is operated in such an unbalanced state for a long period of time without any control, its energy storage capacity is severely degraded.
In order to ensure that the battery monomers work in the best performance state, fully utilize the capacity of the battery pack and prolong the service life of the battery monomers, the reduction of the inconsistency of parameters among the battery monomers is very important for improving the performance of the whole series battery pack, and therefore, the battery balancing technology is developed. Because the lithium ion battery is strictly prohibited from being overcharged in the use process, most of the series lithium ion battery packs adopt an active equalization method to realize the equalization among all battery monomers. In the related art, a second-order equalization topology of cells to the entire battery pack is generally adopted. The first-stage circuit is used for achieving the over-charge discharging function, specifically, each battery cell is connected with one flyback converter, and therefore redundant energy in the over-charge cells is discharged to a capacitor of the common output independently. The second-order flyback converter circuit feeds energy back to the whole battery pack. The balance structure can effectively prevent the battery from being overcharged and can solve the problem of high voltage stress of a power device in a circuit. However, because a large number of transformers are adopted, the circuit has large volume and weight, high cost and poor expansibility.
In addition, there are capacitive based equalization techniques and inductive based equalization techniques. The capacitor-based equalization technology generally requires more switching devices, the equalization circuit is more complex, and the equalization capability is affected by voltage differences among the battery cells. Although the equalization capability of the equalization technology based on the inductance is not influenced by voltage difference between the battery monomers, the energy in the scheme can only be transmitted in the adjacent monomers, and if the positions of the monomers to be equalized are not adjacent, the equalization time is long, and the equalization efficiency is low.
In order to overcome the above problems, the present embodiments provide a battery equalization system, a method, a terminal, and a storage medium, where the battery equalization system includes a receiving end and a transmitting end, both of which adopt SS topology structures, the system has a simpler structure, and is beneficial to reducing the system volume and weight, and reducing the system cost, and energy can be directly transferred from the receiving end to a low-voltage battery at any position, so as to implement single equalization of a battery or series equalization of multiple batteries, and to improve the equalization speed.
The structure, function and implementation process of the battery equalization system provided in this embodiment are illustrated in the following with reference to the accompanying drawings.
The battery equalization system provided by this embodiment, based on the wireless power transmission WPT, adopts a topology structure from a single battery to a whole battery pack, as shown in fig. 1, including: a transmitting terminal 11, a plurality of receiving terminals 12 and a control module 13. The transmitting terminals 11 correspond to a plurality of receiving terminals 12, respectively. The control module 13 is used for controlling the working state of each receiving end 12.
Wherein, as shown in FIG. 2, the transmitting terminal 11 has an inverter dc and a constant voltage power source U connected in seriesinTransmitting coil LSAnd a transmitting capacitor CSAn emission capacitance CSIs a transmitting coil LSThe resonant capacitance of (2). The output end and the input end of the constant voltage power supply are respectively and electrically connected with an inverter.
Each receiving terminal 12 has a receiving coil, a bidirectional switch, a receiving capacitor and a rectifier connected in series; the receiving capacitor is the resonance capacitor of the receiving coil. Each receiving terminal 12 is for electrical connection to a battery cell. The receiver coil of each receiver terminal 12 is arranged to be mutually inductive with the transmitter coil of the transmitter terminal 11.
In addition, Battery n in fig. 2 represents the nth Battery cell; l isn、Sn、CnAnd the Rectifier is a receiving coil, a bidirectional switch, a receiving capacitor and a Rectifier which correspond to Battery respectively. The specific value of N is matched with the number of the battery cells.
The inverter and the constant voltage power supply are used for inverting the direct current into a high-frequency alternating current. The transmitting coil, the transmitting capacitor, the receiving coil, the receiving capacitor and the rectifier are used for realizing wireless transmission of energy and rectifying alternating current into direct current output. The bidirectional switch is used for realizing the directional transfer of energy so as to finish the constant current balance of the battery.
The control module 13 is configured to determine a battery cell to be balanced in the battery pack, control a bidirectional switch electrically connected to the battery cell to be balanced to be turned on, and control the bidirectional switch to be turned off when the battery cell to be balanced reaches a balanced state. The control module 13 controls the working state of the receiving terminal 12 by controlling the on/off of the bidirectional switch.
As shown in fig. 2, fig. 2 is a schematic diagram of a topology structure composed of a transmitting end 11 and n receiving ends 12. Wherein n is the number of the battery cells in the battery pack.
In the present example, when a plurality of cells in the battery pack are unbalanced, the unbalanced cells are taken as the cells to be balanced; and opening a bidirectional switch corresponding to the battery monomer to be balanced, wherein in the balancing process, energy flows to the bidirectional switch from the power supply, and then flows into the battery monomer with lower voltage at the end, so that the increase of the unbalanced battery energy is realized. And when the voltage of the single battery reaches the threshold value in the balancing process, the corresponding bidirectional switch is disconnected, so that the quick balancing of the battery pack is realized.
In addition, after the transmitting coil and the receiving coil are deviated, if current exists in a loop, the balance can be realized through the bidirectional switch, and the problems that mutual inductance of part of receiving windings is reduced and the current is reduced due to the deviation of the transmitting coil and the receiving coil can be avoided, so that the influence of the deviation of the receiving coil on the balance effect is reduced, and the deviation resistance of the system is improved.
The following will not exemplify the implementation of the present embodiment by taking the case where the battery pack has three battery cells. The three-cell based topology is shown in fig. 3 and 4. Let VBattery1>VBattery2>VBattery3In which mutual inductance M1＝M2＝M3＝8.56*10-6. Secondary multiple winding parameter equal L1＝L2＝L3＝10uH，C1＝C2＝C32.5 nF. Where Ls is 18uH and Cs is 1.4 nF. The resonance frequency was 1 MHz. Two-way switch S1、S2、S3The Battery cells correspond to Battery1, Battery2 and Battery3 respectively.
As shown in fig. 3, corresponding to state 1 (t)0-t1): closed bidirectional switch S2And S3Turn off the two-way switch S1，t0Initially, the system passes S2、L2And C2Charging the low-voltage Battery cell 2, and simultaneously, the system passes through S3、L3And C3Charging the low voltage Battery cell 3. The equalization path shown in fig. 3 is to realize constant current equalization of batteries Battery2 and Battery 3. The arrow corresponding to i in fig. 3 is used to illustrate the current flow.
In specific implementation, the balance 2 and the balance 3 can be equalized at the same time. Or balancing the Battery2 and the Battery3 in sequence according to the terminal voltage from big to small, wherein S is carried out after the Battery Battery2 voltage is equal to the Battery13Conducting; s2And (5) disconnecting. Or balancing the Battery3 and the Battery2 in sequence from small to large, wherein S is the voltage of the Battery3 is equal to the Battery12Conducting; s3And (5) disconnecting.
As shown in fig. 4, corresponding to state 2 (t)1-t2): closed bidirectional switch S3Turn off the two-way switch S1And S2，t1Initially, the system passes switch S3、L3And C3Charging the low voltage Battery cell 3. The equalization path shown in fig. 4 is to achieve constant current equalization of the Battery 3. When the Battery voltage 3 is equal to Battery1, S3 is turned off. The arrow corresponding to i in fig. 4 is used to illustrate the current flow.
As shown in fig. 5, the equivalent circuit corresponds to state 2. Analyzing an equivalent circuit corresponding to the state 2, wherein Rs and Rp are parasitic resistances of a transmitting coil and a receiving coil respectively; zs, Zp and Zm are impedances of the transmitting end 11, the receiving end 12 and the mutual inductance, respectively; cS、CPResonance capacitors of the transmitting coil and the receiving coil respectively; ls, Lp andlm is the inductance of the transmitting terminal 11, the inductance of the receiving terminal 12, and the mutual inductance, respectively. The impedance of each branch is shown as formula (1).
ZM＝jωLM (1)
Where ω is the angle measured at rad/s and the operating frequency j is in imaginary units. To simplify the analysis, the inductor and capacitor are set to ideal conditions and the mutual inductance is set to a controlled source. As shown in fig. 6, according to Kirchhoff's Voltage Law (KVL), the system can be described as shown in equation (2).
Wherein U is1And IiIs the phasor of the fundamental harmonic of the inverter output voltage and output current. VoAnd IoRespectively, the phasors of the receiver output voltage and output current. R is the equivalent load resistance. After solving equation (2), the output current can be expressed by the following equation (3):
then, the ratio of the input voltage to the output current is as shown in the following equation (4).
In order to make the output current and the equivalent internal resistance have no correlation, the variable of R must be counteracted in the denominator, the primary and secondary compensation capacitors, namely the resonance capacitor and the coil inductance, can counteract the variable of R, and the SS topological circuit realizes the CC output from the voltage source.
When the coil and the compensation capacitor resonate, the simultaneous equations (5) and (6) are taken into the formula (3), and then the solution is obtained:
Iois the output current, which can be seen to be related to frequency, mutual inductance, input voltage. Therefore, the output current is only related to the input voltage, the system frequency and the coupling mutual inductance, and constant current balance can be realized. With voltage source as input, when ZS＝-ZMThe CC output can be obtained. The system output current is independent of the impedance of the load. This example eliminates the need for a secondary core for the coil, further reducing the weight of the receiver 12.
Therefore, the battery equalization system provided by the embodiment is verified to have practical application value and higher reliability through the simulation of the equalization topological structure, the experimental analysis and the like, and can be widely applied to high-capacity series battery packs.
In one possible implementation manner, the bidirectional switches corresponding to the battery cells are distributed in a matrix form, so as to further facilitate reducing the volume and the occupied space of the system. Illustratively, the bidirectional switches have a plurality of rows and a plurality of columns, the distance between the bidirectional switches in the plurality of rows is equal, and the bidirectional switches in each row are uniformly distributed. Optionally, the bidirectional switch is arranged at the receiving coil; the two-way switch and the receiving coil are integrated, so that the compactness of the system is improved, and the volume and the occupied space of the system are further reduced.
Optionally, the bidirectional switch is a MOSFET switch; wherein, the MOSFET is called Metal-Oxide-Semiconductor Field-Effect Transistor in english, and the MOSFET is called MOSFET in chinese for short. The control module 13 is a digital signal processor DSP; the DSP has low power consumption, small volume and real-time response speed, is beneficial to further reducing the volume of the system and ensuring the balance effect.
In one possible implementation manner, the battery balancing system further includes a detection part, and the detection part is used for detecting the terminal voltage of the battery cell; the control module 13 is configured to determine the battery cells to be equalized in the battery pack according to the detection structure of the detection element.
The detection part can acquire the terminal voltage of the corresponding battery monomer in real time or acquire the terminal voltage of the corresponding battery monomer after a preset time interval. The detecting element is a common voltage detecting element, such as a voltage detecting circuit or a chip, and the embodiment is not limited in this respect.
Optionally, the control module 13 is configured to determine a variance between the terminal voltage of the battery cell and a preset standard value, compare the variance with a threshold, determine that the battery cell is a battery cell to be balanced when the variance is greater than or equal to the threshold, and determine that the battery cell is in a balanced state when the variance is less than the threshold.
The present embodiment provides a battery equalization method, wherein an execution cylinder of the battery equalization method may be a control module in the foregoing embodiment, and implementation processes of the present embodiment are the same as or similar to those of the foregoing embodiment, and are not repeated herein.
As shown in fig. 6, the method for balancing a battery according to this embodiment includes:
s101, acquiring terminal voltage of each battery monomer in the battery pack;
s102, determining the battery monomers to be balanced according to the terminal voltage of each battery monomer;
s103, controlling the bidirectional switch electrically connected with the battery monomer to be balanced to be switched on, and controlling the bidirectional switch to be switched off when the battery monomer to be balanced reaches a balanced state.
Optionally, step S102 includes:
determining the variance of the terminal voltage of the battery monomer and a preset standard value;
comparing the variance with a threshold value, and if the variance is greater than or equal to the threshold value, determining the single battery as the single battery to be balanced;
the battery equalization method further comprises the following steps: and if the variance of the terminal voltage of the single battery and the preset standard value is smaller than the threshold value, determining that the single battery is in a balanced state.
Optionally, after step S102, the method further includes:
sequencing the battery monomers to be balanced;
control and treat the two-way switch who is connected of balanced battery monomer electricity and switch on, include:
and controlling the conduction of a bidirectional switch electrically connected with the battery monomer to be balanced according to the arranged sequence.
The sorting may be performed in the order from the terminal voltage to the terminal voltage, or in the order from the variance to the terminal voltage.
The present embodiment provides a variety of terminals, including:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method in the aforementioned embodiments.
The memory is used for storing a computer program, and the processor executes the computer program after receiving the execution instruction, and the method executed by the apparatus defined by the flow process disclosed in the foregoing corresponding embodiments can be applied to or implemented by the processor.
The Memory may comprise a Random Access Memory (RAM) and may also include a non-volatile Memory, such as at least one disk Memory. The memory can implement communication connection between the system network element and at least one other network element through at least one communication interface (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.
The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the method disclosed in the first embodiment may be implemented by hardware integrated logic circuits in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The corresponding methods, steps, and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software elements in the decoding processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
The present embodiment provides a computer-readable storage medium having stored thereon a computer program; the computer program is executed by a processor to implement the methods in the foregoing embodiments.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In this application, unless expressly stated or limited otherwise, the terms "connected" and the like are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A battery equalization system, comprising:
the transmitting terminal is provided with an inverter, a constant voltage power supply, a transmitting coil and a transmitting capacitor which are connected in series;
each receiving end is provided with a receiving coil, a bidirectional switch, a receiving capacitor and a rectifier which are connected in series; each receiving end is used for being electrically connected with a single battery; the receiving coil of each receiving end is used for mutual inductance with the transmitting coil of the transmitting end;
the control module is used for determining the single batteries to be balanced in the battery pack, controlling the bidirectional switch electrically connected with the single batteries to be balanced to be switched on, and controlling the bidirectional switch to be switched off when the single batteries to be balanced reach a balanced state.
2. The battery equalization system according to claim 1, further comprising a detection member for detecting a terminal voltage of the battery cell; the control module is used for determining the single batteries to be balanced in the battery pack according to the detection structure of the detection piece.
3. The battery equalization system of claim 1, wherein said bidirectional switches are distributed in a matrix; and/or the output end and the input end of the constant voltage power supply are respectively and electrically connected with the inverter.
4. The battery equalization system of claim 1, wherein said bidirectional switch is a MOSFET switch; and/or the control module is a digital signal processor.
5. The battery equalization system of claim 1, wherein the control module is configured to determine a variance between a terminal voltage of the battery cell and a preset standard value, compare the variance with a threshold, determine that the battery cell is a battery cell to be equalized when the variance is greater than or equal to the threshold, and determine that the battery cell is in an equalized state when the variance is less than the threshold.
6. A method for a battery equalization system according to any of claims 1-5, comprising:
acquiring terminal voltage of each battery monomer in the battery pack;
determining the single batteries to be balanced according to the terminal voltage of each single battery;
and controlling a bidirectional switch electrically connected with the battery monomer to be balanced to be switched on, and controlling the bidirectional switch to be switched off when the battery monomer to be balanced reaches a balanced state.
7. The method as claimed in claim 1, wherein the determining the battery cells to be equalized according to the terminal voltages of the battery cells comprises:
determining the variance of the terminal voltage of the battery monomer and a preset standard value;
comparing the variance with a threshold, and if the variance is greater than or equal to the threshold, determining that the battery monomer is a battery monomer to be balanced;
the battery equalization method further comprises the following steps: and if the variance between the terminal voltage of the single battery and a preset standard value is smaller than a threshold value, determining that the single battery is in a balanced state.
8. The method as claimed in claim 6, wherein after determining the battery cells to be equalized according to the terminal voltages of the battery cells, the method further comprises:
sequencing the battery monomers to be balanced;
the control with the two-way switch who treats balanced battery monomer electricity is connected switches on, includes:
and controlling the conduction of a bidirectional switch electrically connected with the battery monomer to be balanced according to the arranged sequence.
9. A terminal, comprising:
a memory;
a processor; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 6-8.
10. A computer-readable storage medium, having stored thereon a computer program; the computer program is executed by a processor to implement the method of any one of claims 6-8.
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