CN114927744A - Battery system, battery pack, automobile and control method of battery system - Google Patents
Battery system, battery pack, automobile and control method of battery system Download PDFInfo
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- CN114927744A CN114927744A CN202210668342.5A CN202210668342A CN114927744A CN 114927744 A CN114927744 A CN 114927744A CN 202210668342 A CN202210668342 A CN 202210668342A CN 114927744 A CN114927744 A CN 114927744A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 invention discloses a battery system, a battery pack, an automobile and a control method of the battery system, and relates to the technical field of power batteries. The battery system comprises a plurality of battery modules, each battery module comprises a plurality of battery monomers, and each battery module comprises at least two battery monomers with different chemical systems; the battery monomers of the same chemical system are connected with each other to form a battery link; all battery links are connected in parallel to form a power supply loop; therefore, the battery cells of various chemical systems are integrated in the battery system, so that the battery system can work by using the battery cells of different chemical systems under different conditions, and the performance of the battery system is improved.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a battery system, a battery pack, an automobile and a control method of the battery system.
Background
With the development and popularization of electric vehicles, the battery safety problem of electric vehicles is more and more prominent. At present, power batteries adopted by electric automobiles comprise batteries with different chemical systems, but the batteries with different chemical systems have different problems, so that the power batteries have partial defects in application and influence the performance of a battery system. For example, the power battery of the lithium iron phosphate system has the problems of low endurance mileage and poor low-temperature performance; the ternary system battery has the problems of poor safety performance and high cost.
Disclosure of Invention
The invention mainly aims to provide a battery system, a battery pack, an automobile and a control method of the battery system, and aims to solve the technical problem that the performance of the battery system is influenced by the defects of a power battery in application due to a self system in the prior art.
In order to achieve the above object, the present invention provides a battery system, which includes a plurality of battery modules, each battery module includes a plurality of battery cells, and each battery module includes at least two battery cells of different chemical systems; the battery monomers of the same chemical system are connected with each other to form a battery link; the battery links are connected in parallel to form a power circuit.
Optionally, the battery system further includes a battery control unit, each battery link includes at least one energy group, each energy group includes at least one battery cell, and the battery control unit is connected to each energy group respectively;
and the battery control unit is used for managing the energy group.
Optionally, the battery control unit includes:
the battery sampling units are connected with the energy groups in a one-to-one correspondence manner and are used for acquiring battery parameters of the energy groups;
and the battery management unit is connected with the battery sampling unit and used for receiving the battery parameters and controlling the corresponding energy group according to the battery parameters.
Optionally, the battery link includes a first link and a second link, each battery module includes at least one lithium iron phosphate battery cell and at least one ternary system battery cell, and the lithium iron phosphate battery cells are connected to form the first link; and all the ternary system battery cells are connected with each other to form a second link.
In addition, in order to achieve the purpose, the invention also provides a battery pack, wherein the battery pack is provided with crossed cross beams and the battery system, the cross beams divide the interior of the battery pack into a plurality of regions, and the battery modules are arranged in the regions in a one-to-one correspondence mode.
Optionally, the battery pack includes a high voltage distribution box having a plurality of switches and a power supply terminal, and each battery link is connected to the power supply terminal through a switch.
In addition, in order to achieve the purpose, the invention also provides an automobile which comprises the battery pack.
In addition, in order to achieve the above object, the present invention further provides a control method of a battery system, where the battery system includes a plurality of battery cells of different chemical systems, the battery cells of each chemical system are connected to form a battery link, each battery link includes at least one energy group, and the energy group includes at least one battery cell;
the control method comprises the following steps:
acquiring fault information and electric quantity information of each energy group;
determining an energy group without fault from each energy group according to the fault information;
and controlling the energy groups without faults according to the electric quantity information.
Optionally, controlling the non-fault energy group according to the electric quantity information includes:
when a discharging instruction is received, determining a power supply energy group from the non-fault energy group according to the electric quantity information;
and communicating the power supply energy group with the power utilization loop so as to discharge the power supply energy group.
Optionally, controlling the failed energy group according to the electric quantity information includes:
when a charging instruction is received, determining a charging energy group from the failed energy group according to the electric quantity information;
and communicating the charging energy group with the charging loop to charge the charging energy group.
According to the invention, a plurality of battery modules are arranged in a battery system, a plurality of battery monomers are arranged in each battery module, and each battery module comprises at least two battery monomers with different chemical systems; the battery monomers of the same chemical system are connected with each other to form a battery link; all battery links are connected in parallel to form a power supply loop; therefore, the battery cells of various chemical systems are integrated in the battery system, so that the battery system can work by using the battery cells of different chemical systems under different conditions, and the performance of the battery system is improved.
Drawings
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram illustrating a structure of a battery system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a battery module;
fig. 3 is a block diagram illustrating a structure of another embodiment of a battery system according to the present invention;
fig. 4 is a block diagram illustrating a structure of still another embodiment of a battery system according to the present invention;
FIG. 5 is a block diagram of a battery pack according to an embodiment of the present invention;
fig. 6 is a block diagram illustrating the structure of another embodiment of a battery pack according to the present invention;
fig. 7 is a flowchart illustrating a control method of a battery system according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
110 | Other |
| 20 | |
120 | |
| 30 | |
130 | |
| 40 | |
140 | High- |
| 50 | |
150 | Switch with a |
| 60 | |
160 | |
| 70 | |
170 | |
| 80 | |
180 | |
| 90 | |
190 | Other electricity-consuming |
| 100 | |
200 | Quick charging unit |
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions relating to "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram illustrating a battery system according to an embodiment of the present invention. The present invention proposes a first embodiment of a battery system.
As shown in fig. 1, in the present embodiment, the battery system 10 includes a plurality of battery modules 20, each battery module 20 includes a plurality of battery cells 30, and each battery module 20 includes at least two battery cells 30 with different chemical systems; the battery cells 30 of the same chemical system are connected to each other to form a battery link; the battery links are connected in parallel to form a power circuit.
It should be noted that the chemical system of the battery cell 30 mainly includes a lithium iron phosphate system, a ternary system, or a lithium iron manganate system. In the present embodiment, the battery modules 20 are formed by alternately mixing the battery cells 30 of different chemical systems, so that the inconvenience of the battery system 10 due to a single chemical system is avoided.
Specifically, the battery cells 30 in each battery module 20 may have the same composition for the convenience of management of the battery system 10. For example, each battery module 20 may include one lithium iron phosphate system battery cell and one ternary system battery cell therein. Or each battery module 20 may include one lithium iron phosphate battery cell and three ternary battery cells; or each battery module 20 may include three lithium iron phosphate system battery cells and one ternary system battery cell. Of course, the composition of the battery cells 30 in each battery module 20 may be different, and the specific number of the battery cells 30 may be set according to the requirement, which is not limited in this embodiment.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a battery module. The battery module 20 in fig. 2 includes two battery cells 30, and the battery cells 30 have tabs 40 on both sides, and the main body thereof is composed of an active material film. When the plurality of battery cells 30 are integrated into the battery module 20, the tabs 40 drawn from the battery cells 30 cannot contact each other, thereby avoiding interference.
It should be noted that the connection relationship between the battery cells of the same chemical system in one battery module 20 may be set as required. For example, if two lithium iron phosphate-based battery cells are disposed inside one battery module 20, the two lithium iron phosphate-based battery cells may be separately led out to the outside, that is, four corresponding tabs are disposed on the battery module 20. Certainly, in order to facilitate connection of the battery module 20, the two lithium iron phosphate battery cells may be connected in series or in parallel and then led out to the outside, that is, only two corresponding tabs are disposed on the battery module 20.
In the present embodiment, the battery cells 30 of different chemical systems in the battery module 20 are connected in parallel, and the battery cells 30 of the same chemical system may be connected in series or in parallel. For example, each of the battery modules A, B, C includes a lithium iron phosphate battery cell and a ternary battery cell, the lithium iron phosphate battery cell (or ternary battery cell) in the battery module a may be connected in series with the lithium iron phosphate battery cell (or ternary battery cell) in the battery module B, and connected in parallel with the lithium iron phosphate battery cell (or ternary battery cell) in the battery module C to form a first link (a second link); or the lithium iron phosphate system battery cell (or the ternary system battery cell) in the battery module a may be connected in parallel with the lithium iron phosphate system battery cell (or the ternary system battery cell) in the battery module B, and connected in series with the lithium iron phosphate system battery cell (or the ternary system battery cell) in the battery module C to form a first link (a second link).
It will be appreciated that the battery system 10 typically provides only a pair of positive and negative poles for power output or input, and therefore the first and second links need to be connected in parallel with the pair of positive and negative poles. By controlling each link, a specific link can be selected for charging or discharging.
In the present embodiment, a plurality of battery modules 20 are provided in the battery system 10, a plurality of battery cells 30 are provided in each battery module 20, and at least two battery cells 30 having different chemical systems are included in each battery module 20; the battery cells 30 of the same chemical system are connected to each other to form a battery link; all battery links are connected in parallel to form a power supply loop; therefore, the battery cells 30 of multiple chemical systems are integrated in the battery system 10, so that the battery system 10 can work with the battery cells 30 of different chemical systems under different conditions, thereby improving the performance of the battery system 10.
Referring to fig. 3, fig. 3 is a block diagram illustrating a structure of another embodiment of a battery system according to the present invention. Based on the first embodiment described above, the present invention proposes a second embodiment of the battery system.
In this embodiment, the battery system 10 further includes a battery control unit 50, each battery link includes at least one energy group, each energy group includes at least one battery cell, and the battery control unit 50 is respectively connected to each energy group; the battery control unit 50 is used to manage the energy bank.
In order to manage the battery system 10, the battery cells 30 in the battery system 10 are divided into energy groups. For example, one battery link may be directly used as one energy bank, that is, in the battery system 10, the battery cells 30 of the same chemical system are used as one energy bank. Alternatively, one battery link may be divided into a plurality of energy groups, for example, the number of the battery cells 30 in one energy group is set, and the battery cells 30 in the battery link are divided according to the number; if the number of the battery cells 30 of one energy group is set to be ten, if the number of the battery cells of the battery link is greater than ten and less than or equal to twenty, the battery link may be divided into two energy groups.
In this embodiment, managing the energy group mainly means controlling whether the energy group is connected to the power supply circuit. Switches are correspondingly arranged on the branches of the energy groups, and when the battery control unit 50 controls the switches to be conducted, the corresponding energy groups are controlled to be connected to the power supply loop; when the battery control unit 50 controls the switch to be turned off, the corresponding energy group is controlled not to be connected to the power supply loop.
Referring to fig. 4, fig. 4 is a block diagram illustrating a battery system according to another embodiment of the present invention. In a specific implementation, the battery control unit 50 may include: the battery sampling units 60 are connected with the energy groups in a one-to-one correspondence manner and are used for acquiring battery parameters of the energy groups; and the battery management unit 70 is connected with the battery sampling unit 60 and is used for receiving the battery parameters and controlling the corresponding energy group according to the battery parameters.
It should be noted that the battery parameters may include parameters such as voltage, current, or internal resistance, and the battery sampling unit 60 is mainly used for acquiring parameters such as voltage, current, or internal resistance of the energy bank. The specific structure of the device can be integrated by various acquisition circuits, the acquisition circuits have mature technologies, and the detailed description of the embodiment is omitted.
The battery management unit 70 may distinguish the battery parameters fed back by each battery sampling unit 60 by using information such as identification. And analyzing the battery parameters to determine the state of the corresponding energy group. For example, the battery management unit 70 may determine the fault information and the remaining capacity of each energy bank according to the battery parameters, and control the energy banks based on the fault information and the remaining capacity.
As an example, the battery management unit 70 may control the power supply of each energy bank. Specifically, the battery management unit 70 may determine an energy group without a fault in the energy groups according to the fault information, determine a quasi power supply energy group in which a remaining power amount in the energy group without the fault is greater than a preset power amount threshold according to the remaining power amount, determine a power supply energy group from the quasi power supply energy group, and control the power supply energy group to be communicated with an external circuit to supply power.
As another example, the battery management unit 70 may also control the charging of each energy bank. Specifically, the battery management unit 70 may determine an energy group that is not failed among the energy groups according to the failure information, determine a quasi-charging energy group in which a remaining power of the energy group that is not failed is less than a preset power threshold according to the remaining power, determine a charging energy group from the quasi-charging energy group, and control the charging energy group to communicate with the external circuit for charging.
The battery management unit 70 is also connected with the vehicle control unit 80, and the battery management unit 70 can receive an instruction below the vehicle control unit 80 and execute corresponding operation; alternatively, the battery management unit 70 provides the information of each energy group to the vehicle control unit 80, so that the vehicle control unit 80 can be used as a control basis. For example, the vehicle control unit 80 may be in communication with the charging pile 90, which may determine a charging current, a charging time, and the like according to the information of each energy group fed back by the battery management unit 70 and the charging pile. The vehicle control unit 80 may also be connected to the motor control unit 100, which may control the motor control unit 100 to adjust the control parameters for the motor according to the discharge current of each energy bank. Of course, the vehicle control unit 80 may also be connected to other function control modules 110, such as a navigation module and an alarm module, and the other function control modules 110 may execute corresponding control according to the battery parameters of each energy group.
In this embodiment, the battery system 10 further includes a battery control unit 50, each battery link includes at least one energy group, each energy group includes at least one battery cell, and the battery control unit 50 is respectively connected to each energy group; the battery control unit 50 is used to manage the energy bank. By utilizing one battery control unit to control each battery link, the control circuit is simple, the energy management control is simple, and the multi-energy source system with highly integrated energy groups of different chemical systems is realized.
Referring to fig. 5, fig. 5 is a block diagram illustrating a structure of a battery pack according to an embodiment of the present invention. In order to achieve the above object, the present invention further provides an embodiment of a battery pack.
As shown in fig. 5, in the present embodiment, the battery pack 120 is provided with the cross beams 130 and the battery system described above, the cross beams 30 divide the interior of the battery pack 120 into a plurality of regions, and the battery modules 20 are provided in the regions in one-to-one correspondence.
It can be appreciated that the cross beam 130 can act as a strength stiffener for the battery pack 120, increasing the strength of the battery pack 120. Meanwhile, the cross beam 130 can secondarily isolate the battery modules 20, thereby improving the reliability of the battery pack 120. The cross beam 130 may further include a wire groove to facilitate connection between the battery modules 20, so as to form a battery link.
In the present embodiment, the battery pack 120 further includes a high voltage distribution box 140, the high voltage distribution box 140 having a plurality of switches 150 and a power terminal 160, and each battery link is connected to the power terminal 160 through the switch 150.
Referring to fig. 6, fig. 6 is a block diagram illustrating a structure of another embodiment of a battery pack according to the present invention. It should be noted that the power supply terminal 160 is mainly used for supplying power to the battery pack 120 or accessing power from the outside. The switch 150 is used to control the on-state of the corresponding energy bank and the power source terminal. During charging, the external power flows from the power terminal 160, and the energy sets corresponding to the switches 150 in the closed state are charged. In the discharge, the discharge currents of the energies corresponding to the closed states of the switches 150 are collected at the power source terminal 160 and output to the outside. The switch 150 may be controlled by the battery management unit 70.
The high voltage distribution box 140 may be connected to the vehicle high voltage box 160, and the vehicle high voltage box 160 may be connected to a motor 170, a slow charging unit 180 (e.g., a slow charging pile) and other power utilization modules 190. The discharge current of each energy bank flows to the entire vehicle high voltage box 160 to be redistributed to each module. The high voltage distribution box 140 may be connected to the quick charging unit 200 (e.g., a quick charging pile) when charging, so as to directly perform charging.
In the present embodiment, the battery system 10 is integrated into the battery pack 120, and the cross member 130 is provided in the battery pack 120 to reinforce the strength and perform secondary division, thereby ensuring the reliability of the battery pack 120. In addition, the specific structure of the battery system 10 can be referred to the above-described embodiments. Since the present battery pack 120 can adopt the technical solutions of all the embodiments, at least the beneficial effects brought by the technical solutions of the embodiments are achieved, and are not described in detail herein.
In addition, in order to achieve the purpose, the invention further provides an automobile which comprises the battery pack. The specific structure of the battery pack can be seen in the above-described embodiments. Since the automobile can adopt the technical solutions of all the embodiments, the automobile at least has the beneficial effects brought by the technical solutions of the embodiments, and the details are not repeated herein.
Referring to fig. 7, fig. 7 is a flowchart illustrating a control method of a battery system according to an embodiment of the present invention. In order to achieve the purpose, the invention also provides a control method of the battery system.
It should be noted that the control method of the battery system in this embodiment is used for controlling the battery system, where the battery system includes a plurality of battery cells of different chemical systems, the battery cells of each chemical system are connected to form a battery link, each battery link includes at least one energy group, and the energy group includes at least one battery cell. The specific structure of the battery system can also refer to the foregoing embodiments.
Referring to fig. 7, in the present embodiment, the control method may include:
step S10: and acquiring fault information and electric quantity information of each energy group.
It should be understood that the execution body of the present embodiment may be a battery management unit that is connected to each energy group, respectively. The battery management unit has functions of program operation, data processing, digital communication and the like. Of course, the execution main body can also be other power utilization modules, such as a vehicle control unit.
It should be noted that each energy bank is correspondingly provided with a battery sampling unit, and the battery sampling unit is mainly used for acquiring parameters such as voltage, current or internal resistance of the energy bank. The specific structure of the device can be integrated by various acquisition circuits, the acquisition circuits have mature technologies, and the detailed description of the embodiment is omitted.
The battery management unit can distinguish the battery parameters fed back by each battery sampling unit by using information such as identification and the like. And analyzing the battery parameters to determine the state of the corresponding energy group. For example, the battery management unit may determine the fault information and the remaining capacity of each energy group according to the battery parameters.
In a specific implementation, since the battery units included in each energy group belong to different chemical systems, the analysis strategies adopted in determining the fault information and the remaining capacity are different. The battery management unit stores analysis strategies corresponding to battery cells of different chemical systems. When battery parameters fed back by the battery sampling unit are received, the chemical system of the battery unit corresponding to the energy group is determined according to the identification, the corresponding analysis strategy is determined according to the determined chemical system, and then the battery parameters are analyzed according to the determined analysis strategy to determine fault information and residual capacity. The analysis of the fault information and the remaining capacity of the battery units of different chemical systems has already been described, and the detailed description of the embodiment is omitted here.
Step S20: and determining the non-fault energy groups from the energy groups according to the fault information.
And after analyzing the fault information, the battery management unit sets fault identifications for the energy groups. The fault identification can be divided into non-fault and fault. Of course, the fault identification may also include other categories. The battery management unit may determine whether each energy bank is faulty according to the fault flag when the energy bank control needs to be performed.
Step S30: and controlling the non-fault energy group according to the electric quantity information.
Note that, the energy bank control may be performed by charge control, discharge control, or the like. Therefore, step S30 may include: when a discharging instruction is received, determining a power supply energy group from the non-fault energy group according to the electric quantity information; and communicating the power supply energy group with the power utilization loop so as to discharge the power supply energy group. Alternatively, step S30 may further include: when a charging instruction is received, determining a charging energy group from the non-fault energy groups according to the electric quantity information; and communicating the charging energy group with the charging loop so as to charge the charging energy group.
The discharging command and the charging command can be sent out by the vehicle control unit. And when receiving the discharge instruction, the battery management unit executes power supply control. Specifically, the battery management unit may determine, according to the remaining power, a quasi-power supply energy group in which the remaining power in the energy group without the fault is greater than a preset power threshold, determine a power supply energy group from the quasi-power supply energy group, and control the power supply energy group to communicate with an external circuit to supply power. Wherein, determining the supply energy group from the quasi-supply energy group may be: the energy group with the largest residual electric quantity in the quasi-power supply energy group is taken as a power supply energy group, after the residual electric quantity of the power supply energy group is reduced to a set electric quantity threshold value, the energy group with the largest current residual electric quantity in the quasi-power supply energy group is taken as a power supply energy group, and the rest is done in sequence.
And when receiving the discharging instruction, the battery management unit executes charging control. Specifically, the battery management unit may determine, according to the remaining power, a quasi-charging energy group in which the remaining power of the non-faulty energy group is smaller than a preset power threshold, determine a charging energy group from the quasi-charging energy group, and control the charging energy group to communicate with an external circuit to perform charging. Wherein determining the charging energy set from the quasi-charging energy sets may be: the energy group with the minimum residual capacity in the quasi-charging energy group is used as the charging energy group, after the residual capacity of the charging energy group rises to a set capacity threshold, the energy group with the minimum current residual capacity in the quasi-charging energy group is used as the charging energy group, and the like.
In the embodiment, fault information and electric quantity information of each energy group are acquired; determining an energy group without fault from each energy group according to the fault information; then controlling the energy group without fault according to the electric quantity information; the battery unit integrated control of different chemical systems is realized, the normal operation of the battery system with highly integrated battery units of different chemical systems is ensured, and the reliability is also improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A battery system is characterized in that the battery system comprises a plurality of battery modules, each battery module comprises a plurality of battery monomers, and each battery module comprises at least two battery monomers with different chemical systems; the battery monomers of the same chemical system are connected with each other to form a battery link; the battery links are connected in parallel to form a power supply loop.
2. The battery system according to claim 1, wherein the battery system further comprises a battery control unit, each battery link comprises at least one energy bank, each energy bank comprises at least one battery cell, and the battery control unit is respectively connected with each energy bank;
the battery control unit is used for managing the energy group.
3. The battery system according to claim 2, wherein the battery control unit includes:
the battery sampling units are connected with the energy groups in a one-to-one correspondence mode and used for acquiring battery parameters of the energy groups;
and the battery management unit is connected with the battery sampling unit and used for receiving the battery parameters and controlling the corresponding energy group according to the battery parameters.
4. The battery system according to any one of claims 1-3, wherein the battery link comprises a first link and a second link, each of the battery modules comprises at least one lithium iron phosphate battery cell and at least one ternary system battery cell, and each of the lithium iron phosphate battery cells are connected with each other to form the first link; and the ternary system battery cells are connected with each other to form the second link.
5. A battery pack, characterized in that the battery pack is provided with cross beams that divide the interior of the battery pack into a plurality of regions in which the battery modules are arranged in one-to-one correspondence, and the battery system according to any one of claims 1 to 4.
6. The battery pack of claim 5, wherein the battery pack includes a high voltage distribution box having a plurality of switches and a power terminal, each of the battery links being connected to the power terminal through the switches.
7. An automobile characterized in that it comprises the battery pack according to claim 5 or 6.
8. The control method of the battery system is characterized in that the battery system comprises a plurality of battery cells of different chemical systems, the battery cells of each chemical system are connected with one another to form battery links, each battery link comprises at least one energy group, and each energy group comprises at least one battery cell;
the control method comprises the following steps:
acquiring fault information and electric quantity information of each energy group;
determining an un-failed energy bank from each of the energy banks according to the fault information;
and controlling the non-fault energy group according to the electric quantity information.
9. The control method according to claim 8, wherein the controlling the non-faulty energy bank according to the charge information comprises:
when a discharging instruction is received, determining a power supply energy group from the non-fault energy groups according to the electric quantity information;
and communicating the power supply energy group with a power utilization loop so as to discharge the power supply energy group.
10. The control method of claim 8, wherein said controlling the non-faulty energy bank as a function of the charge information comprises:
when a charging instruction is received, determining a charging energy group from the non-fault energy groups according to the electric quantity information;
communicating the charging energy bank with a charging circuit to charge the charging energy bank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210668342.5A CN114927744A (en) | 2022-06-14 | 2022-06-14 | Battery system, battery pack, automobile and control method of battery system |
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| CN202210668342.5A CN114927744A (en) | 2022-06-14 | 2022-06-14 | Battery system, battery pack, automobile and control method of battery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117612657A (en) * | 2024-01-24 | 2024-02-27 | 宁德时代新能源科技股份有限公司 | Battery chemistry system determination method, device, electronic equipment and storage medium |
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2022
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117612657A (en) * | 2024-01-24 | 2024-02-27 | 宁德时代新能源科技股份有限公司 | Battery chemistry system determination method, device, electronic equipment and storage medium |
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