CN111204259A - Battery equalization circuit and battery management method - Google Patents
Battery equalization circuit and battery management method Download PDFInfo
- Publication number
- CN111204259A CN111204259A CN202010120376.1A CN202010120376A CN111204259A CN 111204259 A CN111204259 A CN 111204259A CN 202010120376 A CN202010120376 A CN 202010120376A CN 111204259 A CN111204259 A CN 111204259A
- Authority
- CN
- China
- Prior art keywords
- battery
- switch
- single batteries
- loop
- equalizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The application provides a battery equalization circuit and a battery management method, wherein the battery equalization circuit comprises: the system comprises an auxiliary power supply, at least two single batteries and at least two equalizing loops; the single batteries correspond to the equalizing loops one by one; at least two single batteries are sequentially connected in series, and a first switch is arranged between two adjacent single batteries; the positive electrode of the single battery is connected with the positive electrode of the corresponding balancing loop through the first end of the second switch, the negative electrode of the single battery is connected with the positive electrode of the corresponding balancing loop through the second end of the second switch, and the negative electrode of the single battery is connected with the negative electrode of the corresponding balancing loop through the third switch; the positive pole of equalizing loop passes through the third end of second switch and is connected with auxiliary power source's negative pole, and the negative pole of equalizing loop passes through the fourth switch and is connected with auxiliary power source's positive pole, need not to carry out energy balance through charge-discharge between the battery cell, has reduced the battery cell number of times that charges and discharges to the life of battery has been increased.
Description
Technical Field
The present disclosure relates to circuit technologies, and in particular, to a battery equalization circuit and a battery management method.
Background
With the attention of people on environmental protection and the efficient utilization of resources, the new energy automobile becomes the hot door for the development of the automobile industry, the battery is the source of the power of the new energy automobile, the performance of the automobile depends on the battery to a great extent, and therefore the maintenance of the battery is particularly important. The voltage difference of the unit cells is gradually enlarged as the number of charging and discharging times increases, and the voltage difference causes the performance degradation and the operating life shortening of the battery pack.
In the prior art, an equalization circuit is usually added in a battery circuit to equalize the voltage between the single batteries, redundant energy is transferred inside the battery pack through an energy storage device, and the single battery with high energy transfers the energy to the single battery with low energy through the energy storage device.
However, the prior art shortens the service life of the single battery.
Disclosure of Invention
The application provides a battery equalization circuit and a battery management method, which solve the problem that the service life of a single battery is shortened in the prior art.
In a first aspect, the present application provides a battery equalization circuit, comprising:
the system comprises an auxiliary power supply, at least two single batteries and at least two equalizing loops; the single batteries correspond to the equalizing loops one by one;
at least two single batteries are sequentially connected in series, and a first switch is arranged between two adjacent single batteries;
the positive electrode of the single battery is connected with the positive electrode of the corresponding balancing loop through the first end of the second switch, the negative electrode of the single battery is connected with the positive electrode of the corresponding balancing loop through the second end of the second switch, and the negative electrode of the single battery is connected with the negative electrode of the corresponding balancing loop through the third switch;
the positive pole of equalizing loop is connected with auxiliary power source's negative pole through the third end of second switch, and the negative pole of equalizing loop is connected with auxiliary power source's positive pole through the fourth switch to transfer the inside energy of single cell to equalizing loop, equalizing loop shifts to auxiliary power source in, realized transferring the inside equilibrium of single cell to the external circuit, reduced the inside extra charge-discharge process of single cell, increased the life of battery, reduced user's cost.
Optionally, a battery pack formed by sequentially connecting at least two single batteries in series is connected with the auxiliary power supply in parallel, the anode of the battery pack is connected with the anode of the auxiliary power supply through a sixth switch, the cathode of the battery pack is connected with the cathode of the auxiliary power supply through a boost direct current (DCDC) and a fifth switch in sequence, the auxiliary power supply is connected with the battery pack in parallel, and the auxiliary power supply and the battery pack can provide energy for the whole vehicle together, so that energy is further saved, and the cost of a user is reduced.
Optionally, under the condition that a part of the single batteries are fully charged under the charging condition of the battery, the first switch connected with the cathodes of the part of the single batteries is turned off, the first end of the second switch connected with the anodes of the equalization loops corresponding to the part of the single batteries is closed, and the third switch connected with the cathodes of the equalization loops corresponding to the part of the single batteries is closed.
Optionally, when the power storage amount of the equalization loop is greater than the preset value, the third terminal of the second switch connected to the positive electrode of the equalization loop is closed, and the fourth switch connected to the negative electrode of the equalization loop is closed.
Optionally, under a non-charging working condition, if the voltage of a part of the single batteries is higher than the voltages of the rest of the single batteries, the first switch connected to the cathodes of the part of the single batteries is turned off, the second end of the second switch connected to the anodes of the equalization loops corresponding to the part of the single batteries is closed, and the third switch connected to the cathodes of the equalization loops corresponding to the part of the single batteries is closed.
Optionally, the fifth switch and the sixth switch are closed under the condition that the power required by the whole vehicle is greater than the power limit provided by the battery pack formed by sequentially connecting at least two single batteries in series.
In a second aspect, the present application provides a battery management method, including:
controlling the charging of the equalizing loop according to the voltage information of the single battery; the equalizing loop is controlled to charge the auxiliary power supply, so that the voltage difference of the single batteries is adjusted through the equalizing loop, energy is transferred to the auxiliary power supply of an external circuit, extra charging and discharging processes in the batteries are reduced, the service life of the batteries is prolonged, and the cost of users is reduced.
Optionally, the controlling the charging of the equalizing loop according to the voltage information of the single battery includes:
under the condition that the single batteries are fully charged and the rest single batteries are not fully charged, the connection between the single batteries and the rest single batteries is disconnected, an external power supply is controlled to charge the equalizing loop corresponding to the single batteries, the single charging and discharging processes are further reduced in the charging process of the battery pack, the service life of the single batteries is prolonged, the service life of the whole battery pack is prolonged, and the cost of a user is reduced.
Optionally, the controlling the charging of the equalizing loop according to the voltage information of the single battery includes:
under the condition that the voltage of the single battery is higher than the voltages of the other single batteries, the single battery is disconnected from the other single batteries, the single battery is controlled to charge the equalizing loop, the single charging and discharging process is further reduced in the discharging process of the battery pack, the service life of the single battery is prolonged, the service life of the whole battery pack is prolonged, and the cost of a user is reduced.
Optionally, the method includes:
under the condition that the required power of the whole vehicle is greater than the power limit provided by the battery pack formed by connecting the single batteries in series, the auxiliary power supply and the battery pack are controlled to provide power for the whole vehicle, the energy generated by balancing the single batteries is transferred to the auxiliary power supply, and the auxiliary power supply provides enough power for the whole vehicle, so that the energy is further saved, and the cost of a user is reduced.
The application provides a battery equalization circuit and a battery management method, wherein the battery equalization circuit comprises: the system comprises an auxiliary power supply, at least two single batteries and at least two equalizing loops; the single batteries correspond to the equalizing loops one by one; at least two single batteries are sequentially connected in series, and a first switch is arranged between two adjacent single batteries; the positive electrode of the single battery is connected with the positive electrode of the corresponding balancing loop through the first end of the second switch, the negative electrode of the single battery is connected with the positive electrode of the corresponding balancing loop through the second end of the second switch, and the negative electrode of the single battery is connected with the negative electrode of the corresponding balancing loop through the third switch; the positive pole of equalizing loop is connected with auxiliary power source's negative pole through the third end of second switch, the negative pole of equalizing loop is connected with auxiliary power source's positive pole through the fourth switch, when there is the voltage difference between the battery monomer, be connected to the equalizing loop in the circuit, partial free energy transfer to equalizing loop, equalizing loop is with energy storage to auxiliary power source in, thereby, realized transferring the energy of single cell to auxiliary power source, need not to carry out energy balance through the charge-discharge between single cell, the number of times of charge and discharge of single cell has been reduced, thereby the life of battery has been increased, user's cost has been reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional battery management system provided in the prior art;
fig. 2 is a schematic system structure diagram of a battery equalization circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a battery equalization circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application;
fig. 6 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application;
fig. 7 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application;
fig. 8 is a circuit diagram of another battery equalization circuit according to an embodiment of the present application;
fig. 9 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a battery management system according to an embodiment of the present application;
fig. 11 is a flowchart of a battery management method according to an embodiment of the present application;
fig. 12 is a flowchart of another battery management method according to an embodiment of the present application;
fig. 13 is a flowchart of another battery management method according to an embodiment of the present application;
fig. 14 is a flowchart of another battery management method according to an embodiment of the present application.
Description of reference numerals:
30-auxiliary power supply;
31-a single cell;
32-balancing loops corresponding to the single batteries of the single batteries;
311 — a first switch;
321 — a second switch;
331 — a third switch;
341-fourth switch;
35-a boost converter;
305 — a fifth switch;
306 — sixth switch.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixed or indirectly connected through intervening media, or may be interconnected between two elements or may be in the interactive relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a battery management system provided in the prior art, as shown in fig. 1, the battery management system is composed of a discharge balancing circuit, a single battery, a charge balancing circuit and a balancing module, wherein arrows indicate the transmission direction of energy, a voltage difference is generated between the single batteries during charge and discharge of the battery pack, and the voltage difference gradually expands with the increase of the number of charge and discharge times, resulting in the performance degradation and the reduction of the working life of the battery pack, in order to reduce the voltage difference, the balancing circuit is usually used to achieve the balancing of the voltage of the single batteries, when the voltage of the single battery during charge is too high, the energy of the single battery is stored in the balancing module through the charge balancing circuit, when the voltage of the single battery during discharge is too high, the energy stored in the balancing module is stored in the discharge balancing module through the discharge balancing circuit, and the energy stored in the balancing module is transferred to the single battery when the voltage is, however, the prior art increases the number of charge and discharge times of the single battery, and reduces the life of the single battery.
In order to solve the above problems, an embodiment of the present application provides a battery equalization circuit, as shown in fig. 2, fig. 2 is a schematic diagram of a system structure of the battery equalization circuit provided in an embodiment of the present application, an auxiliary power supply is added on the basis of the existing battery management system in fig. 1, an equalization process is transferred from a cell to an equalization loop, and the equalization loop is transferred to an external auxiliary power supply, so that the number of charging and discharging times of the cell is reduced, and the service life of the cell is prolonged.
In the following embodiments of the present application, the single battery is a basic unit of the battery pack, and in order to ensure the power supply of the vehicle, the battery with good quality and sufficient power is usually adopted, so that the cost of the single battery is high, and the single battery is fixed in the battery pack and is complex to detach and replace; the auxiliary power supply is a standby power supply in a vehicle system, provides a low-voltage power supply when a circuit cannot work stably, has lower requirements on quality compared with a single battery, and has lower cost, so that the charging and discharging process of the single battery is transferred to the auxiliary power supply, and the cost of a user is reduced.
The following describes the battery equalization circuit according to the present invention in detail with reference to specific embodiments.
Fig. 3 is a circuit diagram of a battery equalization circuit according to an embodiment of the present disclosure. Exemplarily, the diagram shows an equalizing circuit including two single batteries in a battery pack, and as shown in fig. 3, the battery equalizing circuit according to the embodiment of the present application includes: the auxiliary power supply 30, the single battery 31, the equalizing loop 32 corresponding to the single battery 31, the single battery 33 and the equalizing loop 34 corresponding to the single battery 33; wherein the content of the first and second substances,
the single battery 31 and the single battery 33 are connected in series, a first switch 311 is arranged between the single battery 31 and the single battery 33, and a first switch 312 is arranged between the single battery 33 and the negative electrode of the battery pack;
the positive electrode of the single battery 31 is connected with the positive electrode of the corresponding equalizing circuit 32 through the first end 3211 of the second switch 321, the negative electrode of the single battery 31 is connected with the positive electrode of the corresponding equalizing circuit 32 through the second end 3212 of the second switch 321, and the negative electrode of the single battery 31 is connected with the negative electrode of the corresponding equalizing circuit 32 through the third switch 331; the positive electrode of the single battery 33 is connected with the positive electrode of the corresponding equalizing circuit 34 through the first end 3221 of the second switch 322, the negative electrode of the single battery 33 is connected with the positive electrode of the corresponding equalizing circuit 34 through the second end 3222 of the second switch 322, and the negative electrode of the single battery 33 is connected with the negative electrode of the corresponding equalizing circuit 34 through the third switch 332;
the anode of the equalizing loop 32 is connected with the cathode of the auxiliary power supply 30 through the third end 3213 of the second switch 321, and the cathode of the equalizing loop 32 is connected with the anode of the auxiliary power supply 30 through the fourth switch 341; the positive pole of the equalizing circuit 34 is connected to the negative pole of the auxiliary power supply 30 through the third terminal 3223 of the second switch 322, and the negative pole of the equalizing circuit 34 is connected to the positive pole of the auxiliary power supply 30 through the fourth switch 342.
It is to be understood that, for convenience of example, fig. 3 only shows a battery equalization circuit diagram including two single batteries in the battery pack, and the number of the single batteries in the battery pack is not particularly limited in the present invention.
Taking the voltage equalization of the single battery 31 as an example, when the voltage of the single battery 31 is too high, the energy of the single battery 31 is transferred to the equalization loop 32, and the equalization loop 32 transfers the energy to the auxiliary power supply 30, so that the voltage equalization of the single battery 31 is realized. The configuration of the equalizing circuit 32 and the auxiliary power supply 30 is not particularly limited in the embodiment of the present application.
In this embodiment, when the group battery was in the course of the work, can realize the battery cell through the connection condition who changes the switch, the equalizing loop that the battery cell corresponds and the operating condition of auxiliary power supply in the circuit to, realized transferring the auxiliary power supply to the energy of battery cell, need not to carry out energy balancing through charge-discharge between the battery cell, reduced the battery cell number of charges, thereby increased the life of battery, reduced user's cost.
Fig. 4 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application, and as shown in fig. 4, fig. 4 is a schematic circuit diagram of a battery pack formed by sequentially connecting unit batteries in series on the basis of the embodiment shown in fig. 3, and is connected in parallel with an auxiliary power supply 30, an anode of the battery pack is connected to an anode of the auxiliary power supply 30 through a sixth switch 306, and a cathode of the battery pack is connected to a cathode of the auxiliary power supply 30 through a Direct Current (DCDC) 35 and a fifth switch 305 in sequence.
The auxiliary power supply 30 is connected with the battery pack in parallel, so that when the energy of the battery pack is insufficient to meet the energy requirement of the whole vehicle, the auxiliary power supply and the battery pack jointly supply power to the whole vehicle, the charging times of single batteries are further reduced, the service life of the single batteries is prolonged, and the cost is saved; and, the energy utilization rate is improved.
Exemplarily, taking the balancing process of the single battery 31 as an example, the operation process of the balancing circuit will be described in detail:
fig. 5 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application, and fig. 5 is a schematic circuit diagram of a battery equalization circuit according to a further embodiment of the present application based on the embodiment shown in fig. 3,
the first switch 311 connected to the negative electrode of the cell 31 is closed, the third switch 331 and the fourth switch 341 connected to the negative electrode of the equalization circuit 32 corresponding to the cell 31 are opened, and the second switch 321 is not turned on.
The embodiment is a normal working state in which the single battery 31 is connected to the battery pack, when there is no obvious voltage difference between the single battery 31 and other single batteries in the battery pack, the single battery 31 does not need to equalize voltage, the single battery 31 is connected in series in a circuit of the battery pack, the equalizing circuit 32 and the auxiliary power supply 30 are not connected to the circuit and are in a non-working state, the single battery 31 normally works in the battery pack, and the charging and discharging requirements of the normal work of the battery pack circuit are met.
Optionally, fig. 6 is a schematic circuit diagram of another battery equalization circuit provided in an embodiment of the present application, and fig. 6 is further based on the embodiment shown in fig. 5, as shown in fig. 6, when the first switch 311 is closed and the third switch 331 is opened, that is, when the single battery 31 is connected in series in the battery circuit and normally works, if the power storage amount of the equalization loop 31 is greater than the preset threshold, the second switches 321 and 3213 are turned on, the fourth switch 341 is closed, a loop between the equalization loop 32 and the auxiliary power supply 30 is formed, the equalization loop 32 charges the auxiliary power supply 30, transfers and stores the redundant energy transferred from the single battery 31 to the equalization loop 32 during the cell equalization process into the auxiliary power supply 30, the equalization loop 32 charges the auxiliary power supply 30, achieves the voltage equalization of the single battery 31 transferred from the internal circuit of the battery pack to the external circuit formed by the equalization loop 32 and the auxiliary power supply 30, the extra charging and discharging processes of the circuit monomer in the battery pack are reduced, the service life of the battery is prolonged, and the cost of a user is reduced.
Optionally, the preset threshold of the electric storage capacity of the equalization loop may be a fixed value set when the battery equalization circuit leaves a factory, or may be a threshold that changes according to the electric usage of the circuit, which is not specifically limited in the present application.
Fig. 7 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application, and fig. 7 is a schematic circuit diagram of a battery equalization circuit according to an embodiment of the present application, further,
under the charging working condition of the battery, under the condition that partial single batteries are fully charged, the first switch connected with the cathodes of the partial single batteries is disconnected, the first end of the second switch connected with the anodes of the equalization loops corresponding to the partial single batteries is closed, and the third switch connected with the cathodes of the equalization loops corresponding to the partial single batteries is closed.
As shown in fig. 7, in the case that the unit cell 31 is fully charged under the battery charging condition, the first switch 311 connected to the negative electrode of the unit cell 31 is opened, the first end 3211 of the second switch 321 connected to the positive electrode of the equalizing circuit 32 corresponding to the unit cell 31 is closed, and the third switch 331 connected to the negative electrode of the equalizing circuit 32 corresponding to the unit cell 31 is closed.
In the present embodiment, during the process of charging the battery, during the voltage equalization process of the fully charged single battery 31, as shown in fig. 7, the first switch 311 of the negative electrode access circuit of the fully charged single battery 31 is turned off, the single battery 31 is in the open circuit state and is not accessed to the circuit, the positive electrode of the equalization loop 32 corresponding to the single battery 31 is connected to the positive electrode of the battery pack through the first end 3211 of the second switch, the negative electrode of the equalization loop 32 corresponding to the single battery 31 is accessed to the battery pack circuit through the third switch 331,
in the embodiment, the fully charged single battery 31 is disconnected in the charging process, and the corresponding equalization loop 32 is connected in series to the battery pack circuit, so that the charging and discharging process of the single battery 31 is disconnected, the battery is prevented from being damaged due to excessive charging of the single battery, the charging and discharging times of the single battery 31 are reduced, and the service life of the single battery 31 is prolonged.
Fig. 8 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application, and fig. 8 is a schematic circuit diagram of a battery equalization circuit according to an embodiment of the present application, further,
under the non-charging working condition, if the voltage of part of the single batteries is higher than that of the rest of the single batteries, the first switch connected with the negative electrodes of the part of the single batteries is disconnected, the second end of the second switch connected with the positive electrodes of the equalization loops corresponding to the part of the single batteries is closed, and the third switch connected with the negative electrodes of the equalization loops corresponding to the part of the single batteries is closed.
As shown in fig. 8, in the non-charging condition, if the voltage of the single battery 31 is higher than the voltages of the other single batteries, the first switch 311 connected to the negative electrode of the single battery 31 is opened, the second end of the second switch 3212 connected to the positive electrode of the equalizing circuit 32 corresponding to the single battery 31 is closed, and the third switch 331 connected to the negative electrode of the equalizing circuit 32 corresponding to the single battery 31 is closed.
In the embodiment, during the non-charging process of the battery, the voltage of the single battery 31 with higher voltage is equalized, as shown in fig. 8, the positive electrode of the single battery 31 is connected to the positive electrode of the battery pack, the negative electrode of the single battery 31 is connected to the positive electrode of the equalizing loop 32 through the second end 3212 of the second switch, the negative electrode of the equalizing loop 32 is connected to the positive electrode of the single battery 33, that is, the single battery 31 and the equalizing loop 32 corresponding to the single battery 31 are connected in series to the battery pack together, and the equalizing loop 32 reduces the voltage of the single battery 31 with higher voltage in a series voltage dividing manner, so that the energy equalization of the single battery 31 during the discharging process of the battery pack is realized.
Fig. 9 is a schematic circuit diagram of another battery equalization circuit according to an embodiment of the present application, where fig. 9 is a schematic circuit diagram of a battery equalization circuit, and further, on the basis of the embodiment shown in fig. 3, in a case that a required power of a finished vehicle is greater than a power limit provided by a battery pack formed by at least two single batteries connected in series in sequence, a fifth switch 305 and a sixth switch 306 are closed.
As shown in fig. 9, the single battery 31 and the single battery 33 are connected in series in the battery pack circuit to provide energy for the entire vehicle, and when the power provided by the battery pack is not enough to meet the power requirement of the entire vehicle, the fifth switch 305 and the sixth switch 306 are closed, and the auxiliary power supply 30 and the branch of the boost DCDC series and the battery pack are connected in parallel to the circuit to provide energy for the entire vehicle, wherein the boost DCDC is a converter with different dc power supply values, and boosts the voltage in the auxiliary power supply 30 circuit to achieve a better power supply effect.
Optionally, under the condition that the power of the battery pack can meet the power requirement of the entire vehicle, the fifth switch 305 and the sixth switch 306 are closed, and the auxiliary power supply 30 assists in supplying power to share the power of the battery pack, so that the battery of the battery pack maintains a smaller output power, and the current of the battery is ensured to be within the optimal working range.
The auxiliary power supply and the battery pack assist in power supply, redundant energy is transferred to the whole vehicle, energy is saved, the battery pack works in a proper working range, the service life of the battery is further prolonged, and the cost of a user is reduced.
Fig. 10 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and as shown in fig. 10, the battery management system includes: the battery balancing system comprises a central processing system 901, a communication module 902, a battery parameter detection module 903 and a battery balancing circuit module 904, wherein the central processing system 901 communicates with other modules through the communication module 902, sends and receives various data, analyzes the state of a battery according to the obtained data, and performs corresponding control; and also receives user input and displays battery information, the battery parameter detection module detects the battery state, and the battery equalization circuit module 904 executes commands of the central processing system 901 to equalize the circuit.
Fig. 11 is a flowchart of a battery management method according to an embodiment of the present application, where the method is executed by a battery management system, and as shown in fig. 11, the method includes the following steps:
s1001: and the battery management system controls the charging of the equalizing loop according to the voltage information of the single battery.
S1002: and the battery management system controls the equalizing loop to charge the auxiliary power supply.
In this embodiment, the battery management system determines the single battery with a higher single voltage according to the voltage information of each single battery in the battery pack, controls the charging of the equalization loop corresponding to the single battery, reduces the charging and discharging times of the single battery, and transfers the electric quantity in the equalization loop to the auxiliary power supply, thereby reducing the charging times of the single battery in the energy transfer process of the original equalization loop to the single battery, increasing the service life of the battery, and reducing the cost of a user.
Fig. 12 is a flowchart of another battery management method according to an embodiment of the present application, where fig. 12 is based on fig. 11, and further includes:
s1003: and the battery management system disconnects the single batteries from the rest single batteries and controls an external power supply to charge the equalizing loops corresponding to the single batteries under the condition that the single batteries are fully charged and the rest single batteries are not fully charged.
Optionally, under the non-charging working condition, under the condition that the voltage of the single battery is higher than the voltages of the other single batteries, the voltage value of the higher single voltage is reduced by performing serial voltage division on the high-voltage single batteries and is consistent with the voltage value of the lower single voltage. And controlling the higher single battery to charge the equalizing loop, and transferring redundant energy into the equalizing loop.
In this embodiment, the connection between the single battery with the excessively high voltage and the battery pack is disconnected, and the corresponding equalization loop is connected to the circuit, so that the equalization of the single battery is realized, the charging and discharging times of the single battery in the circuit are reduced, the service life of the battery is prolonged, and the cost of a user is reduced.
Fig. 13 is a flowchart of another battery management method according to an embodiment of the present application, where fig. 13 is based on fig. 11, and further includes:
s1004: the battery management system controls the auxiliary power supply and the battery pack to provide power for the whole vehicle under the condition that the power required by the whole vehicle is larger than the power limit provided by the battery pack formed by connecting the single batteries in series.
In this embodiment, the auxiliary power supply may store energy, and after the charging or discharging equalization, the energy stored in the equalization loop is transferred to the auxiliary power supply, so as to implement energy storage. Optionally, considering the current working condition, if the power demand of the whole vehicle is large, the energy stored in the auxiliary power supply can be released for the working condition of the whole vehicle, and the energy and the battery pack provide power for the whole vehicle, so that the power demand of the vehicle can be met, balanced energy can be utilized to the vehicle, and the smaller output power of the battery can be maintained, so that the current of the battery is ensured to be within the optimal working range, and the service life of the battery is prolonged.
Fig. 14 is a flowchart of another battery management method according to an embodiment of the present application, and as shown in fig. 14, the following describes a battery management process in detail:
the battery management system can control a battery circuit according to the charge-discharge state of a battery, firstly, step 1301 is executed, the working state of a battery pack is judged, under the charging working condition, step 1302 is executed, whether the single battery needs to be balanced or not is judged, if the single battery needs to be balanced, step 1304 is executed, a parallel charging balancing loop is opened, the voltage of the single battery is balanced, if the single battery does not need to be balanced, step 1305 is executed, the balancing loop is disconnected, the current electric energy storage quantity of the balancing loop is judged, if the electric energy storage quantity is larger than a preset threshold value, step 1309 is executed, the balancing loop is connected to an auxiliary power supply charging circuit, the energy stored in the balancing loop is transferred to an auxiliary power supply, and if the electric energy storage quantity is smaller than the preset threshold value; under the non-charging working condition, step 1303 is executed, whether the single batteries need to be equalized is judged, if the single batteries need to be equalized, step 1306 is executed, a series charging equalization loop is opened, the voltages of the single batteries are equalized, if the single batteries do not need to be equalized, step 1307 is executed, the equalization loop is disconnected, the electricity storage quantity of the current equalization loop is judged, if the electricity storage quantity is larger than a preset threshold value, step 1311 is executed, the equalization loop is connected to an auxiliary power supply charging circuit, the energy stored in the equalization loop is transferred to an auxiliary power supply, and if the electricity storage quantity is smaller than the preset threshold value, step 1310 is executed, the equalization loop is disconnected to the auxiliary. After the battery management system balances the circuit, step 1312 is executed to judge the power requirement of the finished automobile currently, if the current power is smaller than the power limit which can be provided by the battery currently, step 1313 is executed, the auxiliary power supply does not work, the battery pack works to provide the requirement for the finished automobile, and if the current power is larger than the power limit which can be provided by the battery currently, step 1314 is executed, the auxiliary power supply and the battery work in parallel, so that the single battery in the battery pack can meet the power requirement of the finished automobile under the condition of better power.
The battery management system of the embodiment controls the working state of the battery pack by judging the working state of the battery pack, can ensure that the battery pack always works in an optimal working range, and prolongs the service life of the battery.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A battery equalization circuit, comprising:
the system comprises an auxiliary power supply, at least two single batteries and at least two equalizing loops; the single batteries correspond to the equalizing loops one by one;
the at least two single batteries are sequentially connected in series, and a first switch is arranged between two adjacent single batteries;
the positive electrode of each single battery is connected with the positive electrode of the corresponding equalizing loop through the first end of the second switch, the negative electrode of each single battery is connected with the positive electrode of the corresponding equalizing loop through the second end of the second switch, and the negative electrode of each single battery is connected with the negative electrode of the corresponding equalizing loop through the third switch;
and the anode of the equalizing loop is connected with the cathode of the auxiliary power supply through the third end of the second switch, and the cathode of the equalizing loop is connected with the anode of the auxiliary power supply through the fourth switch.
2. The battery equalization circuit according to claim 1, wherein a battery pack formed by sequentially connecting the at least two single batteries in series is connected in parallel with the auxiliary power supply, an anode of the battery pack is connected with an anode of the auxiliary power supply through a sixth switch, and a cathode of the battery pack is connected with a cathode of the auxiliary power supply through a boost direct current-to-direct current (DCDC) switch and a fifth switch in sequence.
3. The battery equalization circuit of claim 2,
under the working condition of charging the battery, under the condition that partial single batteries are fully charged, disconnecting a first switch connected with the cathodes of the partial single batteries, closing a first end of a second switch connected with the anodes of the equalization loops corresponding to the partial single batteries, and closing a third switch connected with the cathodes of the equalization loops corresponding to the partial single batteries.
4. The battery equalization circuit of claim 2,
and under the condition that the electric storage quantity of the equalizing loop is larger than a preset value, closing a third end of a second switch connected with the anode of the equalizing loop, and closing a fourth switch connected with the cathode of the equalizing loop.
5. The battery equalization circuit of claim 2,
under the non-charging working condition, if the voltage of part of the single batteries is higher than the voltage of the rest of the single batteries, the first switch connected with the negative electrodes of the part of the single batteries is disconnected, the second end of the second switch connected with the positive electrodes of the equalization loops corresponding to the part of the single batteries is closed, and the third switch connected with the negative electrodes of the equalization loops corresponding to the part of the single batteries is closed.
6. The battery equalization circuit of claim 2,
and under the condition that the required power of the whole vehicle is greater than the power limit provided by a battery pack formed by sequentially connecting the at least two single batteries in series, closing the fifth switch and the sixth switch.
7. A battery management method, comprising:
controlling the charging of the equalizing loop according to the voltage information of the single battery;
and controlling the equalizing loop to charge the auxiliary power supply.
8. The method according to claim 7, wherein the controlling charging the equalization loop according to the voltage information of the single battery comprises:
and under the condition that the single batteries are fully charged and the rest single batteries are not fully charged, disconnecting the single batteries from the rest single batteries and controlling an external power supply to charge the equalizing loops corresponding to the single batteries.
9. The method according to claim 7, wherein the controlling charging the equalization loop according to the voltage information of the single battery comprises:
and under the condition that the voltage of the single battery is higher than the voltages of the other single batteries, disconnecting the single battery from the other single batteries, and controlling the single battery to charge the equalizing loop.
10. The method according to any one of claims 7-9, further comprising:
and under the condition that the required power of the whole vehicle is greater than the power limit provided by a battery pack formed by connecting single batteries in series, controlling the auxiliary power supply and the battery pack to provide power for the whole vehicle together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010120376.1A CN111204259A (en) | 2020-02-26 | 2020-02-26 | Battery equalization circuit and battery management method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010120376.1A CN111204259A (en) | 2020-02-26 | 2020-02-26 | Battery equalization circuit and battery management method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111204259A true CN111204259A (en) | 2020-05-29 |
Family
ID=70781214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010120376.1A Pending CN111204259A (en) | 2020-02-26 | 2020-02-26 | Battery equalization circuit and battery management method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111204259A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022374A (en) * | 2021-02-04 | 2021-06-25 | 东风汽车集团股份有限公司 | Passive equalization control method and system for battery management system of electric vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081095A (en) * | 1998-03-13 | 2000-06-27 | Denso Corporation | Voltage balancer device for combination battery |
| DE10153083A1 (en) * | 2001-10-30 | 2003-05-22 | Fahrzeugausruestung Berlin Gmb | Balanced charging device isolates batteries if deep discharge detected, reconnects if supply voltage restored, charges with appropriate balanced charging current during balanced charging |
| CN105814769A (en) * | 2013-11-29 | 2016-07-27 | 原子能和替代能源委员会 | Device for balancing a power battery element load |
| CN106100078A (en) * | 2016-08-30 | 2016-11-09 | 山东得普达电机股份有限公司 | A kind of non-dissipative equalizing controls device and control method |
| CN108134414A (en) * | 2017-12-08 | 2018-06-08 | 东莞市德尔能新能源股份有限公司 | A kind of modularization equalizing circuit and its balanced way |
-
2020
- 2020-02-26 CN CN202010120376.1A patent/CN111204259A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081095A (en) * | 1998-03-13 | 2000-06-27 | Denso Corporation | Voltage balancer device for combination battery |
| DE10153083A1 (en) * | 2001-10-30 | 2003-05-22 | Fahrzeugausruestung Berlin Gmb | Balanced charging device isolates batteries if deep discharge detected, reconnects if supply voltage restored, charges with appropriate balanced charging current during balanced charging |
| CN105814769A (en) * | 2013-11-29 | 2016-07-27 | 原子能和替代能源委员会 | Device for balancing a power battery element load |
| CN106100078A (en) * | 2016-08-30 | 2016-11-09 | 山东得普达电机股份有限公司 | A kind of non-dissipative equalizing controls device and control method |
| CN108134414A (en) * | 2017-12-08 | 2018-06-08 | 东莞市德尔能新能源股份有限公司 | A kind of modularization equalizing circuit and its balanced way |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022374A (en) * | 2021-02-04 | 2021-06-25 | 东风汽车集团股份有限公司 | Passive equalization control method and system for battery management system of electric vehicle |
| CN113022374B (en) * | 2021-02-04 | 2022-05-17 | 东风汽车集团股份有限公司 | Passive equalization control method and system for battery management system of electric vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102082307B (en) | Method and system for parallel use of lithium battery modules | |
| CN211530808U (en) | Charging and discharging protection system for series battery pack | |
| CN114709896A (en) | Battery charging and discharging system based on reconstruction and charging and discharging control method | |
| CN108847707A (en) | Transforming plant DC power supply system and electric power storage control method | |
| CN111355282A (en) | Charging and discharging protection method and system for series battery pack | |
| CN111245060A (en) | Battery pack parallel operation charging and discharging control system and method based on controllable one-way conduction circuit | |
| CN111204259A (en) | Battery equalization circuit and battery management method | |
| CN110729795B (en) | Energy storage power station and battery balance control method thereof | |
| JP2012115103A (en) | Dc power supply and voltage non-equalization suppressing method of capacitor module | |
| CN116760146A (en) | Active equalization circuit and method of battery pack | |
| CN208445340U (en) | A kind of lithium electricity energy storage backup power supply system | |
| CN116231802A (en) | Lithium ion energy storage battery system with charge and discharge management function and battery stack | |
| CN115986883A (en) | Energy storage system and control method thereof | |
| JP5059674B2 (en) | Power supply system and charging method | |
| CN214100910U (en) | 5G base station energy storage power supply system based on echelon utilization battery active equalization control | |
| CN212874675U (en) | Power battery, battery system and vehicle | |
| CN114336837A (en) | Balance management system applied to battery module and control method thereof | |
| CN113824182A (en) | Passive equalization method and passive equalization system with self-variable period | |
| CN112952926A (en) | Multi-battery switching control circuit, device, system and control method | |
| CN212162838U (en) | Battery equalization management circuit | |
| CN220492681U (en) | Battery cell | |
| CN220652991U (en) | Lithium ion energy storage battery system with charge and discharge management function and battery stack | |
| CN115771409B (en) | Modular battery range-extending and power-changing structure and method for electric vehicle | |
| CN116581852B (en) | Multi-string lithium battery pack charging circuit and method based on step-down charging circuit | |
| CN114123426B (en) | Charging system of power exchange station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200529 |
|
| RJ01 | Rejection of invention patent application after publication |