CN106410892A - Battery protection method, device and system - Google Patents
Battery protection method, device and system Download PDFInfo
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- CN106410892A CN106410892A CN201610826009.7A CN201610826009A CN106410892A CN 106410892 A CN106410892 A CN 106410892A CN 201610826009 A CN201610826009 A CN 201610826009A CN 106410892 A CN106410892 A CN 106410892A
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Abstract
The invention provides a battery protection method, device and system. The method comprises the following steps: acquiring voltage values on both ends of the ith battery in a battery pack, wherein i is an integer greater than 1 and smaller than or equal to N, and N is the number of batteries contained in the battery pack; judging whether the voltage values on both ends of the ith battery are within a preset range; and if not, removing the ith battery from a charging circuit or a discharging circuit. Therefore, all batteries in the battery pack are ensured to be fully charged or discharged, the consistency between the batteries in the battery pack is guaranteed, the overcharge or overdischarge phenomenon of the batteries is effectively prevented, and the service lives of the batteries are prolonged.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a method, an apparatus, and a system for protecting a battery.
Background
At present, most of power batteries used in the industrial field are BATTERY packs composed of a plurality of single batteries with the same performance and parameters, and a BATTERY management system (BATTERY MANAGEMENT SYSTEM, referred to as BMS) is adopted to uniformly monitor and manage the voltage, current, temperature and the like of the BATTERY pack so as to improve the utilization rate of the BATTERY pack as much as possible, prevent the batteries from being overcharged and overdischarged and prolong the service life of the batteries.
Generally, when a battery management system monitors the voltage of a battery pack, if it is determined that the voltage of any battery in the battery pack has an overvoltage phenomenon, the battery pack is controlled to be disconnected from a charging circuit, or when it is determined that the voltage of any battery in the battery pack has an undervoltage phenomenon, the battery pack is disconnected from an electric load.
However, in the above protection manner, if there is a difference between the battery cells in the battery pack, the battery is not fully charged when the charging is disconnected; when discharging, the electric quantity of some batteries is not discharged, thereby influencing the service life of the batteries, aggravating the difference among the single batteries and influencing the service life of the battery pack.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present application is to provide a battery protection method, which ensures that all batteries in a battery pack are fully charged or discharged, ensures consistency among the batteries in the battery pack, effectively prevents the batteries from being overcharged and overdischarged, and prolongs the service life of the batteries.
A second object of the present application is to provide a battery protection device.
A third object of the present application is to provide a battery protection system.
To achieve the above object, an embodiment of a first aspect of the present application provides a battery protection method, including: acquiring voltage values of two ends of an ith battery in the battery pack, wherein i is an integer which is more than 1 and less than or equal to N, and N is the number of batteries in the battery pack; judging whether the voltage values at two ends of the ith battery are in a preset range or not; if not, removing the ith battery from the charging loop or the discharging loop.
In a possible implementation form of the first aspect, before the obtaining the voltage value across the ith battery in the battery pack, the method further includes: judging whether the current working state of the power battery pack is a charging state; if yes, enabling the overvoltage protection monitoring circuit; the judging whether the voltage values at the two ends of the ith battery are in a preset range includes: and judging whether the voltage value at the two ends of the ith battery is higher than a preset high-voltage protection threshold value of a single battery.
In another possible implementation form of the first aspect, after determining whether the current operating state of the power battery pack is an impulsive state, the method further includes: if not, enabling the undervoltage protection monitoring circuit; the judging whether the voltage values at the two ends of the ith battery are in a preset range includes: and judging whether the voltage value at the two ends of the ith battery is lower than a preset low-voltage protection threshold value of a single battery.
In yet another possible implementation form of the first aspect, the removing the ith battery from the charging loop or the discharging loop includes: if the power battery pack is in a charging state currently, controlling a switching device connected with a charging loop of the ith battery in series to be disconnected; or if the power battery pack is in a discharging state currently, controlling a switching device connected in series with a discharging loop of the ith battery to be disconnected.
In yet another possible implementation form of the first aspect, before the determining whether the current operating state of the power battery pack is the charging state, the method further includes:
and detecting the current of the main loop of the power battery pack to determine the current working state of the power battery pack.
According to the battery protection method, the voltage values at the two ends of each battery in the battery pack are obtained in real time, when the voltage values at the two ends of each battery are determined not to be within the preset range, the battery charging circuit or the battery discharging circuit is removed, only batteries which are not charged are charged, or only batteries which are not discharged are used for supplying power to the load, so that the electric quantity of all the batteries in the battery pack can be fully charged or discharged, the consistency among the batteries in the battery pack is ensured, the phenomena of overcharge and overdischarge of the batteries are effectively prevented, and the service life of the batteries is prolonged.
To achieve the above object, an embodiment of a second aspect of the present application provides a battery protection device, including:
the battery pack control module is used for acquiring voltage values of two ends of an ith battery in the battery pack, wherein i is an integer which is larger than 1 and smaller than or equal to N, and N is the number of the batteries in the battery pack; the first judgment module is used for judging whether the voltage values at the two ends of the ith battery are in a preset range or not; and the processing module is used for removing the ith battery from the charging loop or the discharging loop if the voltage value at the two ends of the ith battery is not in a preset range.
In a possible implementation form of the second aspect, the battery protection device further includes: the second judgment module is used for judging whether the current working state of the power battery pack is a charging state; the first enabling module is used for enabling the overvoltage protection monitoring circuit if the current working state of the power battery pack is a charging state; the first judging module is specifically configured to: and judging whether the voltage value at the two ends of the ith battery is higher than a preset high-voltage protection threshold value of a single battery.
In another possible implementation form of the second aspect, the battery protection device further includes: the second enabling module is used for enabling the undervoltage protection monitoring circuit if the current working state of the power battery pack is not a charging state; the first judging module is specifically configured to: and judging whether the voltage value at the two ends of the ith battery is lower than a preset low-voltage protection threshold value of a single battery.
In another possible implementation form of the second aspect, the processing module is specifically configured to: if the power battery pack is in a charging state currently, controlling a switching device connected with a charging loop of the ith battery in series to be disconnected; and if the power battery pack is in a discharging state currently, controlling a switching device connected in series with a discharging loop of the ith battery to be disconnected.
In yet another possible implementation form of the second aspect, the battery protection device includes a determination module, configured to detect a current of the main circuit of the power battery pack to determine a current operating state of the power battery pack.
The battery protection device of the embodiment of the application obtains the voltage values at two ends of each battery in the battery pack in real time, and when the voltage values at two ends of the battery are determined not to be in the preset range, the battery charging circuit or the battery discharging circuit is controlled to be removed, and only batteries which are not charged completely are charged, or only batteries which are not discharged completely are used for supplying power to a load, so that the electric quantity of all the batteries in the battery pack can be fully charged or discharged completely, the consistency among the batteries in the battery pack is ensured, the phenomena of overcharge and overdischarge of the batteries are effectively prevented, and the service life of the batteries is prolonged.
To achieve the above object, a third aspect of the present invention provides a battery system, including: an overvoltage protection monitoring circuit, an undervoltage protection monitoring circuit, a first switching device component, a second switching device component and the overvoltage protection device of the second aspect;
the overvoltage protection monitoring circuit and the undervoltage protection monitoring circuit respectively comprise N branches with the same circuit structure, wherein the ith overvoltage protection monitoring circuit and the ith undervoltage protection monitoring circuit are respectively connected with the ith battery in the battery pack;
an ith switching device in the first switch assembly is connected with a charging loop of an ith battery;
an ith switching device in the second switch assembly is connected with a discharge loop of an ith battery;
the overvoltage protection device is used for controlling each battery to be removed from the charging loop or the discharging loop according to the voltage range of each battery in the battery pack, wherein i is an integer which is larger than 1 and smaller than or equal to N, and N is the number of the batteries in the battery pack.
In a possible implementation form of the third party, the system further includes: a logic gate assembly;
the input end of the ith gate circuit in the logic gate assembly is respectively connected with the ith output end of the overvoltage protection monitoring circuit, the ith output end of the undervoltage protection monitoring circuit and the enabling output end of the battery protection device, and the ith output end of the logic gate is respectively connected with the ith switch device in the first switch device assembly and the ith switch device in the second switch device assembly.
In another possible implementation form of the third party, the logic gate component includes N exclusive or gates.
The battery protection system of the embodiment of the application obtains the voltage values at two ends of each battery in the battery pack in real time, and when the voltage values at two ends of the battery are determined not to be within the preset range, the battery charging circuit or the battery discharging circuit is controlled to be removed, and only batteries which are not charged completely are charged, or only batteries which are not discharged completely are used for supplying power to a load, so that the electric quantity of all the batteries in the battery pack can be fully charged or discharged completely, the consistency among the batteries in the battery pack is ensured, the phenomena of overcharge and overdischarge of the batteries are effectively prevented, and the service life of the batteries is prolonged.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart diagram of a battery protection method according to an embodiment of the present application;
FIG. 2 is a schematic flow chart diagram of a battery protection method according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery protection device according to an embodiment of the present application;
fig. 4 is a schematic structural view of a battery protection device according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a battery protection system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a battery protection system according to another embodiment of the present application;
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a battery protection method, device, and battery system according to embodiments of the present application with reference to the drawings.
Fig. 1 is a schematic flow chart of a battery protection method according to an embodiment of the present application.
As shown in fig. 1, the battery protection method includes:
s101, obtaining voltage values of two ends of an ith battery in the battery pack, wherein i is an integer which is larger than 1 and smaller than or equal to N, and N is the number of the batteries in the battery pack.
Specifically, the main execution body of the battery protection method provided by this embodiment is the battery protection device provided by this embodiment, and the device may be configured in any battery pack having a plurality of batteries, and is used to perform overvoltage or undervoltage protection on each battery in the battery pack.
The battery protection device can acquire the voltage values at two ends of the ith battery in various ways. For example, a voltage sensor may be used to monitor the voltage across each battery, or a voltage comparator may be used to monitor the voltage across each battery.
For example, in order to perform over-voltage and under-voltage protection on each battery, two voltage comparators may be respectively used to monitor the voltage across each battery, and a high-voltage protection threshold and an under-voltage protection threshold of a single battery are respectively used as reference voltage values of the two voltage comparators to perform over-voltage or under-voltage protection on each battery.
And S102, judging whether the voltage values at the two ends of the ith battery are in a preset range.
And S103, if not, cutting off the ith battery from the charging loop or the discharging loop.
The preset range is used for representing the range of voltages at two ends of each battery in the battery pack when the batteries are in the optimal working state, and the preset range can be determined according to performance parameters of the single battery, such as rated voltage, end voltage, charging voltage and the like of the battery.
In the embodiment, the voltage values at two ends of each battery in the battery pack are obtained in real time, and when the voltage values at two ends of the battery are determined not to be within the preset range, the battery is controlled to be removed from the charging loop or the discharging loop, and only the battery which is not charged is charged, or only the battery which is not completely discharged is used for supplying power to the load, so that the electric quantity of all the batteries in the battery pack can be fully charged or discharged, the consistency among the batteries in the battery pack is ensured, the phenomena of overcharge and overdischarge of the batteries are effectively prevented, and the service life of the batteries is prolonged.
Through the analysis, the battery protection device can remove the battery from the charging circuit or the discharging circuit in real time according to the voltage values at two ends of each battery in the battery pack, so that each battery in the battery pack can be reliably charged or discharged. Specifically, the battery protection device may determine to remove the battery from the charging loop or the discharging loop according to a current operating state of the battery pack, such as a charging state or a discharging state, and the battery protection method provided in the present application is further described with reference to fig. 2.
Fig. 2 is a schematic flow chart of a battery protection method according to another embodiment of the present application.
As shown in fig. 2, the battery protection method includes:
s201, judging whether the current working state of the power battery pack is a charging state, if so, executing S202, otherwise, executing S205.
Specifically, the battery protection device can determine the current working state of the power battery pack by detecting the current in the main loop of the power battery pack. For example, because the direction of the current in the main loop is different when the battery pack is in a charging state or a discharging state, the working state of the battery pack can be determined according to the direction of the current in the main loop of the power battery pack in the embodiment.
And S202, enabling the overvoltage protection monitoring circuit.
S203, judging whether the voltage value at the two ends of the ith battery is higher than a preset high-voltage protection threshold value of a single battery, if so, executing S204, otherwise, returning to execute S203.
And S204, controlling the switch device connected with the charging loop of the ith battery in series to be switched off.
Specifically, when the battery pack is in a charging state, only the voltage of each battery needs to be detected whether to reach a high-voltage protection threshold, if so, the switching device connected in series in the battery charging circuit can be disconnected, so that the battery charging circuit is disconnected, the battery charging is stopped, and by analogy, the charging voltage of all the batteries can reach the high-voltage protection threshold of a single battery, so that the overvoltage protection of the batteries is realized, the balance among the batteries is realized, and the consistency among the batteries is ensured.
It is understood that, in the present embodiment, a switching device is connected in series in the charging loop of each battery, and is used for controlling the charging loop of the battery to be switched off or switched on. The switch device may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET for short) with a large current, or may be other controllable devices with a large power, such as a relay and a circuit breaker.
And S205, enabling the undervoltage protection monitoring circuit.
And S206, judging whether the voltage value at the two ends of the ith battery is lower than a preset low-voltage protection threshold value of a single battery, if so, executing S207, otherwise, returning to execute S206.
And S207, controlling the switch device connected with the discharge loop of the ith battery in series to be switched off.
Specifically, when the battery pack works in a discharging state, whether the voltage of each battery is discharged to a low-voltage protection threshold value or not only needs to be monitored, if the voltage of each battery is discharged to the low-voltage protection threshold value, the battery can be removed from a power supply loop, power is continuously supplied to a load only by using other batteries, and the battery pack stops supplying electric energy to the load until the voltage of all the batteries is discharged to be lower than the protection preset value.
The battery protection method provided by the embodiment determines the current working state of the battery pack according to the current state in the main loop of the battery pack, then enables the protection circuit corresponding to the current working state, and further effectively protects the overvoltage or undervoltage of the battery by utilizing the enabled protection circuit, thereby not only effectively preventing the overvoltage or undervoltage phenomenon of the battery, but also ensuring the consistency of each battery in the battery pack, improving the reliability of the battery pack, prolonging the service life of the battery pack, and only enabling one protection circuit according to the current working state of the battery pack, reducing the power consumption of the circuit, and improving the efficiency of the battery.
In order to implement the method, the application provides a battery protection device in another aspect.
Fig. 3 is a schematic structural diagram of a battery protection device according to an embodiment of the present application.
As shown in fig. 3, the battery protection apparatus includes:
the acquiring module 31 is configured to acquire voltage values at two ends of an ith battery in the battery pack, where i is an integer greater than 1 and less than or equal to N, and N is the number of batteries included in the battery pack;
a first determining module 32, configured to determine whether a voltage value at two ends of the ith battery is within a preset range;
the processing module 33 is configured to remove the ith battery from the charging loop or the discharging loop if the voltage value across the ith battery is not within the preset range.
Specifically, the battery protection device provided in this embodiment is used to execute the battery protection method provided in the foregoing embodiment.
The battery protection device of the embodiment of the application obtains the voltage values at two ends of each battery in the battery pack in real time, and when the voltage values at two ends of the battery are determined not to be in the preset range, the battery charging circuit or the battery discharging circuit is controlled to be removed, and only batteries which are not charged completely are charged, or only batteries which are not discharged completely are used for supplying power to a load, so that the electric quantity of all the batteries in the battery pack can be fully charged or discharged completely, the consistency among the batteries in the battery pack is ensured, the phenomena of overcharge and overdischarge of the batteries are effectively prevented, and the service life of the batteries is prolonged.
Fig. 4 is a schematic structural diagram of a battery protection device according to another embodiment of the present application.
As shown in fig. 4, the battery protection device further includes, in addition to the above-described fig. 3:
the second judging module 41 is used for judging whether the current working state of the power battery pack is a charging state;
the first enabling module 42 is used for enabling the overvoltage protection monitoring circuit if the current working state of the power battery pack is a charging state;
correspondingly, the first determining module 32 is specifically configured to:
and judging whether the voltage value at the two ends of the ith battery is higher than a preset high-voltage protection threshold value of a single battery.
Specifically, in order to determine the current operating state of the battery pack, the battery protection device may further include: a determination module 43, configured to detect a current of the main circuit of the power battery pack to determine a current operating state of the power battery pack. Further, still include: the second enabling module 44 is used for enabling the undervoltage protection monitoring circuit if the current working state of the power battery pack is not a charging state;
the first determining module 32 is specifically configured to:
and judging whether the voltage value at the two ends of the ith battery is lower than a preset low-voltage protection threshold value of a single battery.
Correspondingly, the processing module 33 is specifically configured to:
if the power battery pack is in a charging state currently, controlling a switching device connected with a charging loop of the ith battery in series to be disconnected;
and if the power battery pack is in a discharging state currently, controlling a switching device connected in series with a discharging loop of the ith battery to be disconnected.
It should be noted that the foregoing description of the embodiment of the battery protection method is also applicable to the battery protection apparatus provided in this embodiment, and is not repeated herein.
The battery protection device provided by the embodiment determines the current working state of the battery pack according to the current state in the main loop of the battery pack, enables the protection circuit corresponding to the current working state, and further utilizes the enabled protection circuit to effectively protect the overvoltage or undervoltage of the battery, thereby not only effectively preventing the overvoltage or undervoltage phenomenon of the battery, but also ensuring the consistency of each battery in the battery pack, improving the reliability of the battery pack, prolonging the service life of the battery pack, and only enabling one protection circuit according to the current working state of the battery pack, reducing the power consumption of the circuit, and improving the efficiency of the battery.
Fig. 5 is a schematic structural diagram of a battery protection system according to another embodiment of the present application.
As shown in fig. 5, the battery protection system includes: an overvoltage protection monitoring circuit 1, an undervoltage protection monitoring circuit 2, a first switching device component 3, a second switching device component 4 and an overvoltage protection device 5 as described above.
The overvoltage protection monitoring circuit 1 and the undervoltage protection monitoring circuit 2 respectively comprise N branches with the same circuit structure, wherein the ith overvoltage protection monitoring circuit and the ith undervoltage protection monitoring circuit are respectively connected with the ith battery in the battery pack 6; the ith switching device in the first switch assembly 3 is connected with a charging loop of the ith battery; the ith switching device in the second switch assembly 4 is connected with a discharge loop of the ith battery; the overvoltage protection device 5 is configured to control each battery to be removed from the charging loop or the discharging loop according to a voltage range of each battery in the battery pack, where i is an integer greater than 1 and less than or equal to N, and N is the number of batteries included in the battery pack.
It should be noted that, in a possible implementation form of the present application, if the charging loop is the same as the discharging loop, a set of switching device assemblies may be used for controlling the battery to be connected or disconnected with the charging (discharging) loop.
Further, the battery protection system further includes: a logic gate assembly.
The input end of the ith gate circuit in the logic gate assembly is respectively connected with the ith output end of the overvoltage protection monitoring circuit 1, the ith output end of the undervoltage protection monitoring circuit 2 and the enabling output end of the battery protection device 5, and the ith output end of the logic gate is respectively connected with the ith switch device 1i in the first switch device assembly 1 and the ith switch device in the second switch device assembly 2.
Specifically, the logic gate assembly includes N exclusive or gates.
It should be noted that, in the embodiment of the present application, the logic gate is used to control the on or off of the switch device connected to the battery charging circuit or the battery discharging circuit, and since the output of the logic gate is determined by the output of the protection monitoring circuit and the enable signal at the same time, the control error caused by the abnormality of the protection monitoring circuit can be effectively prevented, and the reliability of the battery protection system is improved.
The structure of the battery protection system will be further described with reference to fig. 6 as an example.
Fig. 6 is a partial structural view of a battery protection system.
As shown in fig. 6, the positive input terminal of the first voltage comparator 61 is used for connecting with the voltage U of the battery, and the negative input terminal of the first voltage comparator 61 is connected with the first reference voltage, i.e. the high voltage protection threshold U of the batterymaxThe negative input terminal of the second voltage comparator 62 is connected to the voltage U of the battery, and the positive input terminal of the second voltage comparator 62 is connected to the second terminalThe reference voltage, i.e. the low voltage protection threshold of the battery, is connected, the enable terminals of the first voltage comparator 61 and the second voltage comparator 62 are respectively connected with the enable output terminal IO of the battery protection device, and the first voltage comparator 61 and the second voltage comparator 62 are comparators with opposite enable levels, i.e. if the first voltage comparator 61 is enabled at a low level, the second voltage comparator 62 is enabled at a high level. The output terminal of the first voltage comparator 61, the output terminal of the second voltage comparator 62, and the enable terminal IO of the battery protection device are connected to 3 input terminals of the xor gate 63, respectively, and then the output terminal of the xor gate 63 is connected to the control terminal of the switching device 64.
The type of the switching device 64 may be determined according to the operating logic of the first voltage comparator 61 and the second voltage comparator 62, for example, the switching device 64 is NMOS or PMOS, and the switching device 64 is PMOS in this embodiment.
For example, if the first voltage comparator 61 is enabled at a high level, the second voltage comparator 62 is enabled at a low level, the battery protection device may output a low level enable signal to control the enabling of the second voltage comparator 62 when it is determined that the current operating state of the battery pack is a discharging state, the second voltage comparator 62 outputs a low level signal when the battery voltage is not reduced to be lower than a low voltage protection threshold, and at this time, the xor gate 63 outputs a low level to control the switching device 64 to be turned on because the first voltage comparator 61 is not operated, until the voltage of the battery is lower than the low voltage protection threshold, the second voltage comparator 62 outputs a high level to control the switching device 64 to be turned off.
The battery protection system provided by the embodiment acquires the voltage values at two ends of each battery in the battery pack in real time, and when the voltage values at two ends of the battery are determined not to be within the preset range, the battery protection system controls the battery charging circuit or the battery discharging circuit to be removed, and only the battery which is not charged is charged, or only the battery which is not discharged is used for supplying power to the load, so that the electric quantity of all the batteries in the battery pack can be fully charged or discharged, the consistency among the batteries in the battery pack is ensured, the phenomena of overcharge and overdischarge of the batteries are effectively prevented, and the service life of the batteries is prolonged.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. Furthermore, the terms "first", "second" and "first" 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.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method of protecting a battery, comprising the steps of:
acquiring voltage values of two ends of an ith battery in the battery pack, wherein i is an integer which is more than 1 and less than or equal to N, and N is the number of batteries in the battery pack;
judging whether the voltage values at two ends of the ith battery are in a preset range or not;
if not, removing the ith battery from the charging loop or the discharging loop.
2. The method of claim 1, wherein prior to obtaining the voltage value across the ith cell in the battery pack, further comprising:
judging whether the current working state of the power battery pack is a charging state;
if yes, enabling the overvoltage protection monitoring circuit;
the judging whether the voltage values at the two ends of the ith battery are in a preset range includes:
and judging whether the voltage value at the two ends of the ith battery is higher than a preset high-voltage protection threshold value of a single battery.
3. The method of claim 2, wherein after determining whether the current operating state of the power battery pack is a charging state, further comprising:
if not, enabling the undervoltage protection monitoring circuit;
the judging whether the voltage values at the two ends of the ith battery are in a preset range includes:
and judging whether the voltage value at the two ends of the ith battery is lower than a preset low-voltage protection threshold value of a single battery.
4. The method of claim 1, wherein said removing said ith battery from either a charging loop or a discharging loop comprises:
if the power battery pack is in a charging state currently, controlling a switching device connected with a charging loop of the ith battery in series to be disconnected; or,
and if the power battery pack is in a discharging state currently, controlling a switching device connected in series with a discharging loop of the ith battery to be disconnected.
5. The method of claim 2, wherein determining whether the current operating state of the power battery pack is a charging state further comprises:
and detecting the current of the main loop of the power battery pack to determine the current working state of the power battery pack.
6. A battery protection device, comprising:
the battery pack control module is used for acquiring voltage values of two ends of an ith battery in the battery pack, wherein i is an integer which is larger than 1 and smaller than or equal to N, and N is the number of the batteries in the battery pack;
the first judgment module is used for judging whether the voltage values at the two ends of the ith battery are in a preset range or not;
and the processing module is used for removing the ith battery from the charging loop or the discharging loop if the voltage value at the two ends of the ith battery is not in a preset range.
7. The apparatus of claim 6, further comprising:
the second judgment module is used for judging whether the current working state of the power battery pack is a charging state;
the first enabling module is used for enabling the overvoltage protection monitoring circuit if the current working state of the power battery pack is a charging state;
the first judging module is specifically configured to:
and judging whether the voltage value at the two ends of the ith battery is higher than a preset high-voltage protection threshold value of a single battery.
8. The apparatus of claim 7, further comprising:
the second enabling module is used for enabling the undervoltage protection monitoring circuit if the current working state of the power battery pack is not a charging state;
the first judging module is specifically configured to:
and judging whether the voltage value at the two ends of the ith battery is lower than a preset low-voltage protection threshold value of a single battery.
9. The apparatus of claim 6, wherein the processing module is specifically configured to:
if the power battery pack is in a charging state currently, controlling a switching device connected with a charging loop of the ith battery in series to be disconnected; or,
and if the power battery pack is in a discharging state currently, controlling a switching device connected in series with a discharging loop of the ith battery to be disconnected.
10. A battery protection system, comprising: an overvoltage protection monitoring circuit, an undervoltage protection monitoring circuit, a first switching device component, a second switching device component and an overvoltage protection device according to any one of claims 6 to 10;
the overvoltage protection monitoring circuit and the undervoltage protection monitoring circuit respectively comprise N branches with the same circuit structure, wherein the ith overvoltage protection monitoring circuit and the ith undervoltage protection monitoring circuit are respectively connected with the ith battery in the battery pack;
an ith switching device in the first switch assembly is connected with a charging loop of an ith battery;
an ith switching device in the second switch assembly is connected with a discharge loop of an ith battery;
the overvoltage protection device is used for controlling each battery to be removed from the charging loop or the discharging loop according to the voltage range of each battery in the battery pack, wherein i is an integer which is larger than 1 and smaller than or equal to N, and N is the number of the batteries in the battery pack.
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| CN201610826009.7A CN106410892A (en) | 2016-09-14 | 2016-09-14 | Battery protection method, device and system |
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