CN111835056A - Battery management method, power supply battery applying same and power supply system - Google Patents
Battery management method, power supply battery applying same and power supply system Download PDFInfo
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- CN111835056A CN111835056A CN201911408461.1A CN201911408461A CN111835056A CN 111835056 A CN111835056 A CN 111835056A CN 201911408461 A CN201911408461 A CN 201911408461A CN 111835056 A CN111835056 A CN 111835056A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- 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
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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
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Abstract
The embodiment of the invention discloses a battery management method, a power supply battery applying the battery management method and a power supply system. The method and the device for controlling the power supply of the target battery detect a first output electric signal of a power supply output end connected with the target battery, send a first message for representing the residual capacity of the target battery when the first output electric signal meets a first condition, try to receive a second message for representing the residual capacity of a non-target battery, and further determine the power supply state of the target battery according to the residual capacity of the target battery or the residual capacities of the target battery and the non-target battery, so that the power supply of the target battery is controlled according to the power supply state of the target battery. In the embodiment of the invention, the power supply battery is provided with the control device, so that when the power supply battery and the power supply system carry out battery management by the method of the embodiment of the invention, the power supply battery and the power supply system can carry out more accurate state detection and management on each storage battery, and simultaneously, the cost of the battery management method is effectively reduced.
Description
Technical Field
The invention relates to the field of battery management and power supply, in particular to a battery management method, a power supply battery applying the battery management method and a power supply system.
Background
As the amount of non-renewable resources such as coal, oil, etc. is gradually reduced and air pollution caused by the increase of carbon emission is gradually serious, electric energy is more and more commonly used as an economical, practical, and clean secondary energy. Electric vehicles (including electric vehicles, electric bicycles, and the like) using a secondary Battery (i.e., a secondary Battery) as a power source have been rapidly developed in recent years, but the possibility of abnormality occurrence during charge and discharge of the secondary Battery has been increasing due to an increase in the number of times the secondary Battery is used, and conventionally, the state of the secondary Battery has been detected and managed by a BMS (Battery Management System). However, the BMS is costly to maintain, thus making the existing battery management methods costly.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a battery management method, a power supply battery using the same, and a power supply system, which are used for performing more accurate state detection and management on each storage battery in the power supply system and effectively reducing the cost of the battery management method.
According to a first aspect of embodiments of the present invention, there is provided a battery management method, the method including:
detecting a first output electrical signal of a power supply output end, wherein the power supply output end is connected with a target battery;
in response to the first output electrical signal satisfying a first condition, sending a first message characterizing a first remaining capacity of the target battery and attempting to receive a second message characterizing a second remaining capacity of a non-target battery connected to the power supply output;
determining a power supply state of the target battery according to the first residual capacity or the first residual capacity and the second residual capacity, wherein the power supply state is used for representing whether the target battery supplies power or not;
and controlling the target battery to supply power according to the power supply state.
Preferably, the method further comprises:
detecting the first remaining capacity;
and determining the first message according to the first residual capacity.
Preferably, the determining the power supply state of the target battery according to the first remaining capacity, or the first remaining capacity and the second remaining capacity includes:
in response to receiving at least one of the second messages within a first length of time, determining the power supply status according to the first remaining amount of power and the second remaining amount of power;
in response to not receiving the second message within the first length of time, determining the power supply status according to the first amount of remaining power.
Preferably, the determining the power supply state according to the first remaining capacity and the second remaining capacity includes:
determining that the power supply state is to be supplied with power in response to that the difference value between the first remaining capacity and the second remaining capacity satisfies a second condition;
determining the powered state as unpowered in response to the difference not satisfying the second condition.
Preferably, the determining the power supply state according to the first remaining power amount includes:
determining the power supply state as to-be-supplied in response to the first remaining capacity satisfying a third condition;
determining the power supply state as non-power supply in response to the first remaining capacity not satisfying the third condition.
Preferably, the controlling the target battery to supply power according to the power supply state includes:
detecting a second output electrical signal of the power supply output end;
and controlling the target battery to supply power in response to the second output electric signal meeting a fourth condition and the power supply state being to be supplied with power.
Preferably, the method further comprises:
and controlling the target battery to stop supplying power in response to the fact that the power supply instruction is not received.
Preferably, the method further comprises:
and sending a third message, wherein the third message is used for representing the structural parameters of the target battery.
Preferably, the method further comprises:
acquiring a third residual capacity of the built-in battery;
and determining the power supply state of the target battery according to the third residual capacity so as to supply power.
According to a second aspect of embodiments of the present invention, there is provided a power supply battery including:
a battery cell;
a storage device configured to store the method of any one of the first aspects;
a control device connected to the battery cell and the storage device, configured to perform the method of any one of the first aspect to control the battery cell;
a communication device connected with the control device and configured to receive or transmit messages under the control of the control device.
According to a third aspect of embodiments of the present invention, there is provided a power supply system including:
a built-in battery;
at least one power supply battery as described in the second aspect;
a central controller connected with the built-in battery and the power supply battery and configured to send a power supply instruction to the power supply battery to control the power supply battery.
The method and the device for controlling the power supply of the target battery detect a first output electric signal of a power supply output end connected with the target battery, send a first message for representing the residual capacity of the target battery when the first output electric signal meets a first condition, try to receive a second message for representing the residual capacity of a non-target battery, and further determine the power supply state of the target battery according to the residual capacity of the target battery or the residual capacities of the target battery and the non-target battery, so that the power supply of the target battery is controlled according to the power supply state of the target battery. In the embodiment of the invention, the power supply battery is provided with the control device, so that when the power supply battery and the power supply system manage the batteries by the method of the embodiment of the invention, each storage battery can perform more accurate state detection and management, and meanwhile, the cost of the battery management method is effectively reduced.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a power supply system of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power cell of an embodiment of the present invention;
fig. 3 is a flowchart of a battery management method according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a partial structure of a battery model employed in the battery management method of the first embodiment of the invention;
FIG. 5 is a schematic diagram of a power supply system of a second embodiment of the present invention;
FIG. 6 is a flow chart of a battery management method according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a power supply system of a third embodiment of the present invention;
fig. 8 is a flowchart of a battery management method according to a third embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The widespread use of electrical energy in life and production has led to the rapid development of electric vehicles using batteries as a source of motive power in recent years. However, the performance of the battery is gradually degraded due to an increase in the number of times of use, overcharge (discharge), and the like, and the possibility of occurrence of an abnormal condition such as explosion, short circuit, and the like in the battery during charge and discharge is also gradually increased. Therefore, in the related art, the state of the battery is generally detected and managed by the BMS. The BMS has a relatively complicated structure and thus has high maintenance costs. And electric vehicle manufacturers sometimes use lithium batteries as storage batteries in order to save the manufacturing cost of electric bicycles. However, lithium crystals gradually precipitate on the surface of the lithium battery during use, and the lithium crystals are branched or needle-shaped, and are also called lithium dendrites. As the service time increases, the lithium dendrites increase and are likely to penetrate the separator between the positive and negative electrodes of the battery, causing internal short circuits of the battery and spontaneous combustion of the battery. Therefore, even if the electric bicycle is provided with the BMS, the BMS cannot effectively avoid the explosion of the battery due to the above-mentioned reasons.
In the embodiment of the present invention, an electric bicycle is taken as an example for description, but those skilled in the art will readily understand that the battery management method, the power supply battery using the same, and the power supply system of the present embodiment may also be applied to other electric vehicles such as an electric vehicle.
Fig. 1 is a schematic diagram of a power supply system according to an embodiment of the present invention. As shown in fig. 1, the power supply system of the present embodiment includes an internal battery 11, at least one power supply battery 12, and a central controller 13, and fig. 1 illustrates one power supply battery 12 as an example. In the embodiment of the present invention, the built-in battery 11 is connected to the power supply battery 12 and the central controller 13, and the power supply battery 12 and the central controller 13 may be connected in a wireless manner. The built-in battery 11 may be a lithium battery, and the central controller 13 may be various existing electric vehicle controllers, which may be specifically selected according to the type of the electric bicycle. The built-in battery 11 is configured to supply power to the central controller 13, the power supply battery 12 is configured to supply power to the built-in battery 11 according to a state of charge (a remaining capacity described below) of the built-in battery 11, the central controller 13 is configured to control starting, running, advancing and retreating, stopping of a motor of the electric vehicle and other electronic devices of the electric vehicle, and in the embodiment of the present invention, the central controller 13 is specifically configured to send a power supply instruction to the power supply battery 12 to control the power supply battery 12.
In some optional implementations, the power supply system of the embodiment of the present invention may further include at least one of an acceleration sensor, a current detection circuit, a voltage detection circuit, and a power amount detection circuit. The acceleration sensor is connected to the central controller 13 and configured to detect an acceleration of the electric vehicle corresponding to the central controller 13. Any one of the voltage detection circuit and the power detection circuit is connected to the internal battery 11 and the central controller 13 and/or the power supply battery 12, and is configured to detect corresponding parameters (i.e., a charge and discharge current, an open-circuit voltage, and a remaining power) of the internal battery 11 and/or the power supply battery 12 to determine the remaining power of the internal battery 11 and/or the power supply battery 12. In the embodiment of the present invention, the power detection circuit can be implemented in various existing manners, for example, by a method described in "li chunfeng" a design of a battery power monitoring circuit, academic press of institute of electronic information and technology, No. 3, No. 5, 2006.
Fig. 2 is a schematic diagram of a power supply battery according to an embodiment of the present invention. As shown in fig. 2, the power supply battery according to the embodiment of the present invention includes a battery cell 21, a storage device 22, a control device 23, and a communication device 24. The control device 23 is connected to the battery cells 21, the storage device 22, and the communication device 24.
In the embodiment of the present invention, the battery cell may be a lead-acid battery (i.e., a lead storage battery), a lithium battery, or the like. Storage 22, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The control device 23 executes various functional applications and data processing of the apparatus by executing nonvolatile software programs, instructions, and modules stored in the storage device 22, that is, executes a battery management method stored in the storage device 22 to control the battery cells 21, and controls the communication device 24 to receive or transmit messages. The storage device 22 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store a list of options, etc. Further, the storage 22 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. One or more modules are stored in storage device 22 and, when executed by controller 23, perform any of the steps in the embodiments of the present invention.
In some optional implementations, the power supply battery according to the embodiment of the present invention may further include at least one of a current detection circuit, a voltage detection circuit, and an electric quantity detection circuit, where any one of the above-mentioned circuits may be specifically connected to the battery cell 21 and the control device 23, so that any one of the voltage detection circuit and the electric quantity detection circuit may detect a parameter corresponding to the battery cell 21 under the control of the control device 23, so as to determine the remaining electric quantity of the battery cell 21.
In the embodiment of the present invention, the control device 23 may detect a first output electrical signal at the power output end connected to the battery cell 21, and when the first output electrical signal satisfies a first condition, send a first message for characterizing a first remaining capacity of the battery cell 21 (i.e., a target battery), and attempt to receive a second message for characterizing a second remaining capacity of a non-target battery, so as to determine a power supply state of the battery cell 21 according to the first remaining capacity or according to the first remaining capacity and the second remaining capacity, and thus control the battery cell 21 to supply power according to the power supply state. In some embodiments, the control device 23 is also connected to a central controller. If the control device 23 does not receive the power supply instruction sent by the central controller, the control device controls the battery cells 21 to stop supplying power. In some embodiments, the control device 23 may further determine the power supply state of the battery cell 21 according to a third remaining capacity of the power supply battery for supplying power to the central controller. The above-mentioned product can execute the steps provided by the embodiments of the present invention, and has the corresponding functional modules and beneficial effects of the execution method, and the technical details not described in detail in this section can be referred to the method provided by the embodiments of the present application.
Fig. 3 is a flowchart of a battery management method according to a first embodiment of the present invention. As shown in fig. 3, the method of the present embodiment includes the following steps:
step S100, detecting a first output electric signal at the power supply output end.
In this embodiment, the power supply battery may be connected to a power output end of the electric bicycle to serve as a power supply to supply power to the electric bicycle, and the target battery and the control device in the power supply battery are connected to the power output end. The target battery is also a battery cell (i.e., a storage battery) in a power supply battery configuring the control device. The control device (control device described below) of the power supply battery detects a first output electric signal at the power supply output terminal after the target battery is connected to the power supply output terminal. The first output electrical signal may be a voltage signal at the power output terminal, an electrical power signal at the power output terminal, or a current signal at the power output terminal, which is not limited in this embodiment.
Step S200, sending the first message and attempting to receive the second message.
When the first output electric signal satisfies a first condition, the control device transmits a first message for characterizing the remaining capacity of the target battery (i.e., a first remaining capacity) and attempts to receive a second message for characterizing the remaining capacity of the non-target battery (i.e., a second remaining capacity). The first condition may be set to be that the first output electrical signal is smaller than a first threshold, and the like, where the first threshold is any real number greater than or equal to 0. When the first output electric signal meets the first condition, it indicates that no other power supply battery is supplying power at the current moment, so as to avoid the situation that the electric bicycle cannot be used due to the fact that no power supply battery is supplying power for a long time, the control device may try to receive the second message within the first time length after sending the first message.
Optionally, before this step, the method of this embodiment may further include the following step:
in step S200A, a first remaining capacity is detected.
The first remaining capacity has a strong correlation with the open-circuit voltage of the target battery, and therefore, optionally, when the power supply battery is configured with the voltage detection circuit, the control device may control the voltage detection circuit to directly detect the open-circuit voltage of the target battery, and determine the first remaining capacity of the target battery according to a pre-configured corresponding relationship region between the open-circuit voltage and the remaining capacity.
Alternatively, when the current detection circuit is configured in the power supply battery, the control device may sample the discharge current of the target battery in real time by using a coulometer method (that is, a charge amount calculation method), and obtain the charge amount change of the target battery through integration, so as to calculate the first remaining capacity of the target battery according to the total charge amount of the battery and the charge amount change value.
Alternatively, when the power supply battery is provided with a capacity electrical measurement circuit, the control device may directly detect the first remaining capacity of the target battery through the capacity detection circuit.
It is to be understood that, in this embodiment, the control device may also detect the first remaining capacity of the target battery in other ways according to the hardware configuration of the power supply battery, and this embodiment is not limited thereto.
It is easy to understand that step S200A and step S100 may be executed simultaneously or sequentially, and this embodiment is not limited.
Step S200B, determining a first message according to the first remaining capacity.
The control device may determine the first message according to the first remaining capacity after determining the first remaining capacity of the target battery. It is easy to understand that the first message may further include other information, such as a device identifier of the control device or a battery identifier of the target battery, and the embodiment is not limited thereto.
Step S300, determining a power supply state of the target battery according to the first remaining capacity, or the first remaining capacity and the second remaining capacity.
If the control device receives at least one second message within the first time length, it can be considered that at least one other power supply battery exists within a certain range where the target battery is located, and therefore the control device can determine the power supply state of the target battery according to the first remaining capacity of the target battery and the second remaining capacity of at least one non-target battery.
Specifically, the control device may obtain a difference between the first remaining capacity and the second remaining capacity, and determine whether the difference between the first remaining capacity and the second remaining capacity satisfies the second condition. The difference between the first remaining capacity and the second remaining capacity is used to represent the difference between the remaining capacities of the target battery and the non-target battery, and the second condition may be set to be that the difference between the first remaining capacity and the second remaining capacity is greater than or equal to a second threshold, and the like, where the second threshold is a predetermined real number greater than 0 and less than 1. If the difference between the first remaining capacity and the second remaining capacity meets the second condition, the target battery is considered to be more suitable for supplying power than the non-target battery, so that the control device can determine the power supply state of the target battery as to-be-supplied power; if the difference between the first remaining capacity and the second remaining capacity does not satisfy the second condition, it may be determined that the target battery is not more suitable for supplying power than the non-target battery, and therefore the control device may determine the power supply state of the target battery as not supplying power.
It is easy to understand that the control device may also determine the power supply state of the target battery by other manners, for example, whether the first remaining capacity is higher than the predetermined threshold and larger than the second threshold, and the embodiment is not limited.
And if the control device receives a plurality of second messages within the first time length, the control device may obtain a difference between the first remaining power and each of the second remaining power, and determine whether each of the differences satisfies a second condition. If the difference values meet the second condition, the control device can determine the power supply state of the target battery as the power to be supplied; if there is at least one difference that does not satisfy the second condition, the control device may determine the power supply state of the target battery as not supplying power.
In this step, if the control device does not receive the second message within the first time period, it may be determined that no other power supply battery exists within a certain range where the target battery is located, and therefore the control device may determine the power supply state of the target battery according to the first remaining power of the target battery.
Alternatively, the control device may determine the power supply state of the target battery as to-be-supplied when the first remaining capacity satisfies a third condition, and determine the remaining capacity of the target battery as not-to-be-supplied when the first remaining capacity does not satisfy the third condition. The third condition is used for judging whether the first residual capacity of the target battery is sufficient or not, so that overdischarge of the target battery can be effectively avoided. The third condition may be set such that the first remaining capacity is greater than a third threshold value, and the like, wherein the third threshold value is a predetermined real number greater than 0 and less than 1.
Optionally, if the control device does not receive the second message within the first time period, the power supply state of the target battery may also be directly determined as to-be-powered.
And step S400, controlling the target battery to supply power according to the power supply state.
Optionally, the control device may detect a second output electrical signal at the power output end, and control the power supply state to supply power to the target battery to be powered when the second output electrical signal satisfies a fourth condition. In this embodiment, the second output electrical signal may also be a voltage signal at the power output terminal, an electrical power signal at the power output terminal, or a current signal at the power output terminal. The fourth condition is used to determine whether there is another power supply battery supplying power at the present time, and may specifically be set to be that the second output electrical signal is greater than a fourth threshold, where the fourth threshold is any real number greater than or equal to 0. It is to be understood that, in the present embodiment, the first condition and the fourth condition may be the same or different.
It is easy to understand that if at least one other power supply battery is supplying power (i.e., the second output electrical signal does not satisfy the fourth condition) or the power supply state of the target battery is not supplying power at the present moment, the control device may control the target battery not to supply power.
Fig. 4 is a schematic diagram of a partial structure of a battery model employed in the battery management method of the first embodiment of the present invention. Fig. 4 illustrates a battery management method according to this embodiment by taking an example in which three power supply batteries are connected in parallel. As shown in fig. 4, the power supply battery 41, the power supply battery 42, and the power supply battery 43 are connected to the power supply output terminals, respectively. Specifically, the electric control switches S1, S2 and S3 are respectively arranged between the battery cells in the power supply battery 41, the power supply battery 42 and the power supply battery 43 and the battery output end. Taking the electrically controlled switch S1 as an example, the switch S1 may be disposed on the power supply battery 41, or may be disposed on the electric vehicle, and the embodiment is not limited. The control means in the power supply battery 41, the power supply battery 42 and the power supply battery 43 may be directly connected to the power supply output terminal so that the output electrical signal of the power supply output terminal may be detected.
In practical applications, the power supply battery 41, the power supply battery 42, and the power supply battery 43 cannot be accessed simultaneously, and therefore, the access sequence is power supply battery 41 → power supply battery 42 → power supply battery 43. After the power supply battery 41 is connected to the power supply output end, the control device corresponding to the power supply battery 41 detects the power supply output end, obtains a first voltage signal (i.e., a first output electrical signal), and broadcasts a first message for representing a first remaining capacity of the target battery when the voltage signal is less than 1V (i.e., meets a first condition), and tries to receive a second message for representing a second remaining capacity of the non-target battery (i.e., the target battery corresponding to the power supply battery 42 and the power supply battery 43) within 30s (i.e., a first time period). The supply battery 42 and the supply battery 43 are both connected to the battery output within 30s, so that a first message can be sent to the supply battery 41 and the supply battery 43/supply battery 42, respectively, within a first period. It is easy to understand that, taking the power supply battery 41 as an example, for the power supply battery 41, the power supply battery 42 and the first message sent by the power supply battery 43 are also the second message. For the power supply battery 41, the first remaining capacity of the target battery is 80%, the second remaining capacity of the non-target battery corresponding to the power supply battery 42 is 60%, the second remaining capacity of the non-target battery corresponding to the power supply battery 43 is 50%, and the difference between the first remaining capacity and the second remaining capacity is greater than 5% (that is, the second condition is satisfied), so that the control device corresponding to the power supply battery 41 may determine the state corresponding to the target battery as to be supplied with power. For the power supply battery 42 and the power supply battery 43, the difference between the first remaining capacity and the second remaining capacity is less than or equal to 5%, so that the control devices corresponding to the power supply battery 42 and the power supply battery 43 can respectively determine the power supply state of the corresponding target battery as no power supply. After determining the power supply state of the target battery as to-be-supplied, the control device corresponding to the power supply battery 41 may detect the power supply output end again, obtain the second voltage signal, that is, the second output electrical signal), and control the target battery to supply power when the second voltage signal is less than 1V, that is, meets the third condition). Specifically, the control device corresponding to the power supply battery 41 may control the corresponding target battery power supply in such a manner that the control switch S1 is closed.
The embodiment detects a first output electric signal of a power output end connected with a target battery, sends a first message for representing the residual capacity of the target battery when the first output electric signal meets a first condition, tries to receive a second message for representing the residual capacity of a non-target battery, determines the power supply state of the target battery according to the residual capacity of the target battery or the residual capacities of the target battery and the non-target battery, and controls the power supply of the target battery according to the power supply state of the target battery. In the present embodiment, the control device is disposed in the power supply battery, so that when the power supply battery and the power supply system perform battery management by using the method of the present embodiment, the power supply battery and the power supply system can perform more accurate state detection and management on each storage battery without a battery management system or without low accuracy of the battery management system, and the cost of the battery management method is effectively reduced.
Fig. 5 is a schematic diagram of a power supply system of a second embodiment of the present invention. Fig. 5 illustrates an example in which the power supply system includes a power supply battery. As shown in fig. 5, the control device 51 is connected to a power output terminal 52 and also to a central controller 53 via a communication device. The control device 51 controls the switch 53 to be closed according to the second output electric signal of the power output end 52 and the power supply state of the battery cell, so that the battery cell is powered, and then the central controller 53 and the built-in battery are connected with the battery cell. The central controller may detect the power supply index of the battery cell in the second time period, and may send a power supply instruction to the control device 51 when all the power supply indexes are normal, so that the battery cell continues to supply power. In some optional implementations, the control device 51 may send a third message for characterizing the structural parameters of the battery cells to the central controller 53, so that the central controller may also send a power supply instruction to the control device 51 when the structural parameters of the battery cells and the power supply indexes are all normal.
Fig. 6 is a flowchart of a battery management method according to a second embodiment of the present invention. As shown in fig. 5, the method of the present embodiment includes the following steps:
step S100', a first output electrical signal at the power output terminal is detected.
In this embodiment, the implementation manner of step S100' is similar to that of step S100, and is not described herein again.
Step S200' detects a first remaining power.
In this embodiment, the implementation manner of step S200' is similar to that of step S200, and is not described herein again.
Step S300', determining a first message according to the first remaining power.
In this embodiment, the implementation manner of step S300' is similar to that of step S200A, and is not described herein again.
In this embodiment, step S100 'and step S300' may be executed simultaneously or sequentially, and this embodiment is not limited.
Step S400' sends a first message and attempts to receive a second message.
In this embodiment, the implementation manner of step S400' is similar to that of step S200B, and is not described herein again.
Step S500', determining a power supply state of the target battery according to the first remaining capacity, or the first remaining capacity and the second remaining capacity.
In this embodiment, the implementation manner of step S500' is similar to that of step S300, and is not described herein again.
And step 600', controlling the power supply of the target battery according to the power supply state.
In this embodiment, the implementation manner of step S600' is similar to that of step S400, and is not described herein again.
Step S700', in response to not receiving the power supply instruction, the control target battery stops supplying power.
Specifically, the control device may control the target battery to stop supplying power when receiving a power supply instruction sent by the central controller within the second time period.
After the power supply battery is connected to the electric vehicle, the central controller is also connected with the power supply battery, and performs stability detection on various power supply indexes of the target battery in the power supply process of the target battery, wherein the power supply indexes can be output current, output voltage, output power, temperature and the like of the target battery.
In a possible case, if the stability of the power supply indicator is poor (for example, the difference between the output currents of two adjacent detection times is greater than a certain threshold), it indicates that the currently-supplied power supply battery is abnormal, and therefore, a power supply instruction is not sent to the power supply device corresponding to the power supply battery, which makes the control device unable to receive the power supply instruction, so as to control the target battery to stop supplying power.
Optionally, the method of this embodiment may further include the following steps:
step S700A', sending a third message.
In another possible case, the control device sends a third message to the central controller for characterizing the structural parameters of the target battery. The structural parameters may include internal resistance, capacity, open-circuit voltage, charge termination voltage, discharge termination voltage, self-discharge rate, and the like of the target battery, which is not limited in this embodiment. After receiving the third message, the central controller may determine the structural parameters of the target battery, and determine whether the target battery is suitable for supplying power to the electric bicycle. If at least one parameter item which does not meet the preset standard exists in the structural parameters, the central controller does not send a power supply instruction to the power supply device corresponding to the power supply battery, so that the control device cannot receive the power supply instruction, and the target battery is controlled to stop supplying power.
It is easily understood that step S700A 'is performed before step S700'.
In still another case, the central controller may perform detection simultaneously according to the structural parameter and the power supply index of the target parameter after receiving the third message sent by the control device, and when any one of the structural parameter and the power supply index does not meet the predetermined standard, not send the power supply instruction to the power supply device corresponding to the power supply battery, which makes the control device unable to receive the power supply instruction, thereby controlling the target battery to stop supplying power.
In the practical application process, the central controller and the power supply battery may have problems such as abnormal connection. If the power supply index and/or the structural parameter of the power supply battery are abnormal, the central controller may not successfully control the power supply battery to stop supplying power (for example, successfully send a power supply stop instruction to the power supply battery), and the power supply battery continues supplying power, resulting in problems of spontaneous combustion and explosion. In this embodiment, if the control device does not receive the power supply instruction sent by the central controller within the predetermined time period, the control device may control the target battery to stop supplying power, so as to effectively reduce the problems of spontaneous combustion and explosion caused by the abnormality of the target battery.
The control device of this embodiment detects a first output electrical signal at a power output end connected to a target battery, and sends a first message for representing the remaining capacity of the target battery when the first output electrical signal satisfies a first condition, and tries to receive a second message for representing the remaining capacity of a non-target battery, and then determines the power supply state of the target battery according to the remaining capacity of the target battery, or the remaining capacities of the target battery and the non-target battery, so as to control the power supply of the target battery according to the power supply state of the target battery. And if the power supply instruction sent by the central controller is not received, the control device controls the target battery to stop supplying power. In the present embodiment, the control device is disposed on the power supply battery, so that when the power supply battery and the power supply system perform battery management by using the method of the present embodiment, the power supply battery and the power supply system can perform relatively accurate state detection and management on each storage battery without a battery management system, and at the same time, the cost of the battery management method is effectively reduced.
Fig. 7 is a schematic diagram of a power supply system of a third embodiment of the present invention. The control device 71 may supply power to the electric bicycle during the running of the electric bicycle, or may determine a power supply state of the internal battery based on the third remaining power of the internal battery to supply power. Specifically, the control device may be connected to the contact 74 via a control switch to control the battery cell to supply power to the electric bicycle, and connected to the contact 75 via a control switch to control the battery cell to supply power to the internal battery. Alternatively, the central controller 72 may be connected to an acceleration sensor 76 of the electric bicycle so as to detect the acceleration of the electric bicycle.
In an alternative implementation, the central controller 72 may control the acceleration sensor 76 to detect the acceleration of the electric bicycle, detect a third remaining capacity of the built-in battery 73 when the acceleration satisfies a sixth condition, and send a power supply instruction for the built-in battery to the control device 71 when the third remaining capacity satisfies a fifth condition. The power supply device receives a power supply command for the internal battery, and then the control switch is connected to the contact 75.
In another alternative implementation, the central controller 72 may control the acceleration sensor 76 to detect the acceleration of the electric bicycle, and when the acceleration satisfies a sixth condition, detect a third remaining capacity of the internal battery 73, and send the third remaining capacity to the control device 71. The control device 71, after receiving the third remaining capacity, controls the switch to connect with the contact 75 when the third remaining capacity satisfies a fifth condition.
Fig. 8 is a flowchart of a battery management method according to a third embodiment of the present invention. As shown in fig. 6, the method of the present embodiment includes the following steps:
and step S100', detecting a first output electric signal at the power supply output end.
In this embodiment, the implementation manner of step S S100 ″ is similar to that of step S100, and will not be described herein again.
Step S200 ″, a first remaining power is detected.
In this embodiment, the implementation manner of step S200 "is similar to that of step S200, and is not described herein again.
And step S300', a first message is determined according to the first residual capacity.
In this embodiment, the implementation manner of step S300 ″ and step S200A is similar, and will not be described herein again.
In this embodiment, step S100 "and step S300" may be executed simultaneously or sequentially, and this embodiment is not limited.
Step S400 ″, a first message is sent and reception of a second message is attempted.
In this embodiment, the implementation manner of step S400 ″ is similar to that of step S400', and is not described herein again.
And step S500', determining the power supply state of the target battery according to the first residual capacity or the first residual capacity and the second residual capacity.
In this embodiment, the implementation manner of step S500 ″ is similar to that of step S500', and is not described herein again.
And step S600', the power supply of the target battery is controlled according to the power supply state.
In this embodiment, the implementation manner of step S600 ″ is similar to that of step S600', and is not described herein again.
Step S700 ″, in response to not receiving the power supply instruction, the control target battery stops supplying power.
In this embodiment, the implementation manner of step S700 ″ is similar to that of step S700', and is not described herein again.
In an optional implementation manner, the method of this implementation may further include the following steps:
step S700A ", a third message is sent.
In this embodiment, the implementation manner of step S700A ″ is similar to that of step S700A', and is not described herein again.
It is readily understood that step S700A "is performed before step S700".
And step S800', acquiring a third residual capacity of the built-in battery.
In this embodiment, a built-in battery is used to power the central controller. The central controller is connected with the acceleration sensor of the electric bicycle and can control the acceleration sensor to detect the acceleration of the electric bicycle. In practical applications, the electric bicycle cannot keep running at a constant speed for a long time, so that whether the electric bicycle is moving can be judged through acceleration. Alternatively, if the acceleration of the electric bicycle satisfies a sixth condition (for example, when the acceleration is less than a certain threshold value for a third time period), the central controller may detect a third remaining capacity of the internal battery and send the third remaining capacity to the control device. Therefore, the extra consumption of the residual capacity of the power supply battery in the running process of the electric bicycle can be avoided. It is easy to understand that the detection method of the third remaining power is similar to the detection method of the first battery power, and is not repeated herein.
Optionally, this step may also be performed by the central controller (i.e., the third remaining power is not sent to the control device), and this embodiment is not limited.
And step S900', determining the power supply state of the target battery according to the third residual capacity so as to supply power.
Specifically, the control device may determine the power supply state of the target battery as power supply when the third remaining capacity of the internal battery satisfies the fifth condition and the power supply state of the target battery is to be supplied with power, so as to supply power to the internal battery. The fifth condition is used for measuring a third remaining capacity of the built-in battery, and if the third remaining capacity meets the fifth condition, it indicates that the third remaining capacity is low, and the built-in battery cannot normally supply power to the central controller. The fifth condition may be configured that the third remaining capacity is less than a fifth threshold value and the like, wherein the fifth threshold value is a predetermined real number greater than 0 and less than 1.
If the third remaining capacity of the internal battery does not satisfy the fifth condition or the power supply state of the target battery is no power supply, it indicates that the third remaining capacity of the internal battery is sufficient or the target battery is not suitable for power supply, so the control device may determine the power supply state of the target battery as no power supply to control the target battery not to supply power.
Optionally, this step may also be executed by a central controller, and this embodiment is not limited. When the central controller is executed, the central controller may acquire a power supply state of the target battery when the third remaining capacity of the internal battery satisfies a fifth condition, and send a power supply instruction to the control device corresponding to the target battery to control the target battery to supply power when the power supply state is to-be-supplied.
The control device of this embodiment detects a first output electrical signal at a power output end connected to a target battery, and sends a first message for representing the remaining capacity of the target battery when the first output electrical signal satisfies a first condition, and tries to receive a second message for representing the remaining capacity of a non-target battery, and then determines the power supply state of the target battery according to the remaining capacity of the target battery, or the remaining capacities of the target battery and the non-target battery, so as to control the power supply of the target battery according to the power supply state of the target battery. And if the power supply instruction sent by the central controller is not received, the control device controls the target battery to stop supplying power. Meanwhile, the control device can determine the power supply state of the target battery according to the residual capacity of the built-in battery sent by the central controller so as to supply power. In the embodiment, the power supply battery is provided with the control device, so that when the power supply battery and the power supply system perform battery management by using the method of the embodiment, the power supply battery and the power supply system can perform relatively accurate state detection and management on each storage battery without a battery management system, the cost of the battery management method is effectively reduced, and meanwhile, the working time of the central controller can be effectively prolonged to ensure the performance of the electric bicycle.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method of battery management, the method comprising:
detecting a first output electrical signal of a power supply output end, wherein the power supply output end is connected with a target battery;
in response to the first output electrical signal satisfying a first condition, sending a first message characterizing a first remaining capacity of the target battery and attempting to receive a second message characterizing a second remaining capacity of a non-target battery connected to the power supply output;
determining a power supply state of the target battery according to the first residual capacity or the first residual capacity and the second residual capacity, wherein the power supply state is used for representing whether the target battery supplies power or not;
and controlling the target battery to supply power according to the power supply state.
2. The method of claim 1, further comprising:
detecting the first remaining capacity;
and determining the first message according to the first residual capacity.
3. The method according to claim 1, wherein the determining the power supply state of the target battery according to the first remaining capacity or the first remaining capacity and the second remaining capacity comprises:
in response to receiving at least one of the second messages within a first length of time, determining the power supply status according to the first remaining amount of power and the second remaining amount of power;
in response to not receiving the second message within the first length of time, determining the power supply status according to the first amount of remaining power.
4. The method of claim 3, wherein the determining the power supply status according to the first remaining amount and the second remaining amount comprises:
determining that the power supply state is to be supplied with power in response to that the difference value between the first remaining capacity and the second remaining capacity satisfies a second condition;
determining the powered state as unpowered in response to the difference not satisfying the second condition.
5. The method of claim 3, wherein the determining the power supply status according to the first remaining power amount comprises:
determining the power supply state as to-be-supplied in response to the first remaining capacity satisfying a third condition;
determining the power supply state as non-power supply in response to the first remaining capacity not satisfying the third condition.
6. The method of claim 1, wherein the controlling the target battery to supply power according to the power supply status comprises:
detecting a second output electrical signal of the power supply output end;
and controlling the target battery to supply power in response to the second output electric signal meeting a fourth condition and the power supply state being to be supplied with power.
7. The method of claim 1, further comprising:
and controlling the target battery to stop supplying power in response to the fact that the power supply instruction is not received.
8. The method of claim 7, further comprising:
and sending a third message, wherein the third message is used for representing the structural parameters of the target battery.
9. The method of any one of claims 1, 7 or 8, further comprising:
acquiring a third residual capacity of the built-in battery;
and determining the power supply state of the target battery according to the third residual capacity so as to supply power.
10. The method of claim 9, wherein the determining the power supply status of the target battery according to the third remaining capacity comprises:
in response to that the third remaining capacity meets a fifth condition and the power supply state is to-be-supplied, determining that the power supply state is power supply;
and determining that the power supply state is non-power supply in response to the third remaining capacity not meeting the fifth condition or the power supply state being non-power supply.
11. A power supply battery, characterized in that the battery comprises:
a battery cell;
a storage device configured to store the method as recited in claims 1-10;
a control device connected with the battery cell and the storage device, configured to perform the method of any one of claims 1-10 to control the battery cell;
a communication device connected with the control device and configured to receive or transmit messages under the control of the control device.
12. A power supply system, characterized in that the system comprises:
a built-in battery;
at least one power supply battery according to claim 11;
a central controller connected with the built-in battery and the power supply battery and configured to send a power supply instruction to the power supply battery to control the power supply battery.
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