CN213093258U - Battery system and battery system group - Google Patents
Battery system and battery system group Download PDFInfo
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- CN213093258U CN213093258U CN202021662213.8U CN202021662213U CN213093258U CN 213093258 U CN213093258 U CN 213093258U CN 202021662213 U CN202021662213 U CN 202021662213U CN 213093258 U CN213093258 U CN 213093258U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
An embodiment of the utility model provides a battery system and battery system group, include: the battery management device comprises a battery monitoring unit, a first switch circuit and a second switch circuit, wherein the first switch circuit and the second switch circuit are connected in series; the battery monitoring unit is respectively connected with the positive electrode of the battery, the positive electrode of the battery system, the third switching unit and the fourth switching unit, and the battery monitoring unit is used for controlling the switching states of the third switching unit and the fourth switching unit according to electric signals of the positive electrode of the battery and the positive electrode of the battery system. The safety of the battery system is improved.
Description
Technical Field
The embodiment of the utility model provides a relate to battery technical field, especially relate to a battery system and battery system group.
Background
The application of electronic devices or apparatuses using batteries as power sources is becoming widespread, such as electric automobiles, backup battery systems, high-power portable electric devices, and the like.
In the practical application process, a plurality of battery systems can be used in parallel. When a plurality of battery systems are connected in parallel, if the capacity difference of different battery systems is large, large current can exist between the battery systems to be mutually charged, so that damage is caused, even battery thermal runaway can be caused, and the safety of the battery systems is poor.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a battery system and battery system group has improved battery system's security.
In a first aspect, an embodiment of the present invention provides a battery system, including: a battery and a battery management device comprising a battery monitoring unit, a first switching circuit and a second switching circuit, wherein,
the first switch circuit and the second switch circuit are connected in series, the first switch circuit comprises a first switch unit and a third switch unit which are connected in parallel, and the second switch circuit comprises a second switch unit and a fourth switch unit which are connected in parallel;
the battery monitoring unit is respectively connected with the positive electrode of the battery, the positive electrode of the battery system, the third switching unit and the fourth switching unit, and the battery monitoring unit is used for controlling the switching states of the third switching unit and the fourth switching unit according to electric signals of the positive electrode of the battery and the positive electrode of the battery system.
In one possible embodiment, the first switch unit includes a first resistor and a first PMOS transistor, wherein,
the first resistor is connected with the first PMOS tube in series;
the drain electrode of the first PMOS tube is connected with the anode of the battery, the source electrode of the first PMOS tube is connected with the second switch circuit, and the grid electrode of the first PMOS tube is connected with the battery monitoring unit.
In one possible embodiment, the resistance value of the first resistor is greater than or equal to a first threshold value.
In one possible embodiment, the second switch unit includes a second resistor and a second PMOS transistor, wherein,
the second resistor is connected with the second PMOS tube in series;
the drain electrode of the second PMOS tube is connected with the negative electrode of the battery, the source electrode of the second PMOS tube is connected with the first switch circuit, and the grid electrode of the second PMOS tube is connected with the battery monitoring unit.
In one possible embodiment, the resistance value of the second resistor is greater than or equal to a second threshold value.
In one possible embodiment, the third switching unit is a first NMOS transistor, wherein,
the source electrode of the first NMOS tube is connected with the anode of the battery, the drain electrode of the first NMOS tube is connected with the second switch circuit, the grid electrode of the first NMOS tube is connected with the battery monitoring unit, and the battery monitoring unit is used for controlling the first PMOS tube to be switched on or switched off.
In one possible embodiment, the third switching unit is a second NMOS transistor, wherein,
the source electrode of the second NMOS tube is connected with the negative electrode of the battery, the drain electrode of the second NMOS tube is connected with the first switch circuit, the grid electrode of the second NMOS tube is connected with the battery monitoring unit, and the battery monitoring unit is used for controlling the second NMOS tube to be switched on or switched off.
In one possible embodiment, the battery system further comprises an MCU, wherein,
the MCU is respectively connected with the battery monitoring unit, the third switch unit and the fourth switch unit, and the battery monitoring system is used for controlling the on-off states of the third switch unit and the fourth switch unit through the MCU.
In one possible embodiment, the battery system further comprises a power supply module, wherein,
the power supply module is respectively connected with the battery monitoring power supply and the MCU, and the power supply module is used for supplying power to the battery monitoring power supply and the MCU.
In a second aspect, an embodiment of the present invention provides a battery system set, including at least two battery systems according to any one of the first aspects;
the at least two battery systems are connected in series; alternatively, the first and second electrodes may be,
the at least two battery systems are connected in parallel.
An embodiment of the utility model provides a battery system and battery system group, include: the battery management device comprises a battery monitoring unit, a first switch circuit and a second switch circuit, wherein the first switch circuit and the second switch circuit are connected in series; the battery monitoring unit is respectively connected with the positive electrode of the battery, the positive electrode of the battery system, the third switching unit and the fourth switching unit, and the battery monitoring unit is used for controlling the switching states of the third switching unit and the fourth switching unit according to electric signals of the positive electrode of the battery and the positive electrode of the battery system. In the process, the battery monitoring unit can control the fourth switch unit to be closed according to the positive electrode of the battery and the electric signals of the positive electrodes of the battery systems, and when the battery monitoring unit monitors that the electric signals of the two ends of the battery are normal, the third switch unit is controlled to be closed, so that after the fourth switch unit is closed and a plurality of battery systems are used in parallel and the capacities of the batteries are different, the battery monitoring unit can monitor the abnormal electric signals of the two ends of the battery, the third switch unit is controlled to be kept in an open state, the phenomenon of mutual charging of large currents when the battery systems with different capacities are connected in parallel is prevented, and the safety of the battery systems is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a battery system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another battery system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another battery system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another battery system according to an embodiment of the present invention;
fig. 5 is a battery system set according to an embodiment of the present invention;
fig. 6 is another battery system set according to an embodiment of the present invention.
Description of reference numerals:
10: a battery;
11: a battery monitoring unit;
12: a first switching circuit;
13: a second switching circuit;
121: a first switch unit;
122: a third switching unit;
131: a second switching unit;
132: a fourth switching unit;
1211: a first resistor;
1311: a second resistor;
1212: a first PMOS tube;
1312: a second PMOS tube;
1222: a first NMOS transistor;
1322: a second NMOS transistor;
14：MCU；
r: a resistance;
f: and a fuse.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a battery system according to an embodiment of the present invention. Referring to fig. 1, the battery system includes: the battery management device comprises a battery 10 and a battery management device, wherein the battery management device comprises a battery monitoring unit 11, a first switch circuit 12 and a second switch circuit 13, the first switch circuit 12 and the second switch circuit 13 are connected in series, the first switch circuit 12 comprises a first switch unit 121 and a third switch unit 122 which are connected in parallel, and the second switch circuit 13 comprises a second switch unit 131 and a fourth switch unit 132 which are connected in parallel; the battery monitoring unit 11 is respectively connected with the positive electrode of the battery 10, the positive electrode of the battery system, the third switching unit 122 and the fourth switching unit 132, and the battery monitoring unit 11 is configured to control the switching states of the third switching unit 122 and the fourth switching unit 132 according to electric signals of the positive electrode of the battery 10 and the positive electrode of the battery system.
Optionally, the battery system may include the battery 10 and a battery management device, and the battery system may be connected to a load for performing a discharging operation, or may be connected to a power supply for charging the battery of the battery system.
Alternatively, the battery 10 is a device that can convert chemical energy and electric energy into each other, and has a positive electrode and a negative electrode, and can be charged or discharged. During charging, the battery 10 regenerates internal chemical substances using external electric energy to convert the electric energy into chemical energy. Upon discharge, the battery 10 may convert chemical energy into electrical energy for output. Alternatively, the battery 10 may include, but is not limited to, a lithium ion battery, a lead acid battery, a solar cell. Optionally, the number of the batteries 10 may be one, or may be multiple, and if the number of the batteries 10 is multiple, the batteries 10 may be used in series or in parallel, which is not limited in the present invention.
Optionally, the battery management device may manage the battery 10, so as to ensure the normal operation of the battery 10. Specifically, the battery management apparatus may include a battery monitoring unit 11, a first switch circuit 12, and a second switch circuit 13, wherein the first switch circuit 12 and the second switch circuit 13 are connected in series, the first switch circuit 12 includes a first switch unit 121 and a third switch unit 122 connected in parallel, and the second switch circuit 13 includes a second switch unit 131 and a fourth switch unit 132 connected in parallel. Optionally, the switch unit may include a field effect transistor switch, a single-pole single-throw switch, or other circuit units that can be opened and closed, and the present invention is not limited in this respect. Alternatively, the first switching unit 121, the second switching unit 131, the third switching unit 122, and the fourth switching unit 132 may include the same device or different devices.
Optionally, the battery monitoring unit 11 is connected to the positive electrode of the battery 10, the positive electrode of the battery system, the third switching unit 122 and the fourth switching unit 132, respectively, and the battery monitoring unit 11 may collect electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, specifically, the electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system may include voltage values of the positive electrode of the battery 10 and the positive electrode of the battery system, a current direction flowing through the battery 10, and a current value. Optionally, the battery monitoring unit 11 may include a voltage comparator, configured to collect voltage values of the positive electrode of the battery 10 and the positive electrode of the battery system, and output a comparison result of the voltage values of the positive electrode of the battery 10 and the positive electrode of the battery system; the battery monitoring unit 11 may include a current comparator for collecting a current direction and a current value flowing through the battery 10 and outputting the current direction and the current value flowing through the battery 10.
Alternatively, the battery monitoring unit 11 may control the switching states of the third switching unit 122 and the fourth switching unit 132 according to the electric signals of the positive electrode of the battery 10 and the positive electrode of the battery system through the following feasible implementation manners:
when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than the first threshold value, the battery monitoring unit 11 may recognize that the battery system is in a discharging state, and the battery monitoring unit 11 sends a first control signal to the fourth switching unit 132, where the first control signal is used to close the fourth switching unit 132. The battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a second threshold value, the battery monitoring unit 11 sends a second control signal to the third switching unit 122, and the second control signal is used for closing the third switching unit 122.
When the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is smaller than the voltage of the positive electrode of the battery system, the battery monitoring unit 11 may recognize that the battery system is in a charging state, and when the battery monitoring unit 11 monitors that the current flowing through the battery 10 is larger than a third threshold, the battery monitoring unit 11 sends a fifth control signal to the fourth switching unit 132, where the fifth control signal is used to close the fourth switching unit 132. The battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is less than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a fourth threshold value, the battery monitoring unit 11 sends a sixth control signal to the third switching unit 122, and the sixth control signal is used for closing the third switching unit 122.
Next, the operation of the battery system will be described in detail.
The battery monitoring unit 11 may set an initial state of the battery system, which may be that the first and second switching units 121 and 131 are in a closed state, and a first threshold value, which may be a magnitude of current flowing through the battery 10 when the battery system is discharged.
When a load or a power source is connected to the battery system, the battery monitoring unit 11 monitors the voltage of the positive electrode of the battery 10 and the voltage of the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a first threshold value, the battery monitoring unit 11 recognizes that the battery system is in a discharging state, that is, the load is connected to the battery system and needs to be supplied with power, the battery monitoring unit 11 sends a first control signal to the fourth switching unit 132, and the first control signal is used for closing the fourth switching unit 132. At this time, the battery system enters a pre-discharge mode. In the pre-discharge mode, the battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a second threshold value, the battery monitoring unit 11 sends a second control signal to the third switching unit 122, and the second control signal is used for closing the third switching unit 122.
Optionally, after the fourth switching unit 132 is turned on, the battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is smaller than the voltage of the positive electrode of the battery system, the battery system is in an abnormal condition, for example, the abnormal condition may be a condition that large currents are charged with each other when the battery systems are used in parallel, and the battery monitoring unit 11 sends a third control signal to the fourth switching unit 132, where the third control signal is used to disconnect the fourth switching unit 132, so that the large currents are prevented from being charged with each other in the battery system, and the safety of the battery system is ensured.
Optionally, after the fourth switching unit 132 is turned on, the battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is smaller than the second threshold, the battery system is in an undervoltage state, the battery monitoring unit 11 sends a fourth control signal to the third switching unit 122 and the fourth switching unit 132 respectively, and the fourth control signal is used to disconnect the third switching unit 122 and the fourth switching unit 132, so that the safety of the battery system is ensured when an undervoltage condition occurs in the discharging process of the battery system.
When the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is less than the voltage of the positive electrode of the battery 10 system, the battery monitoring unit 11 recognizes that the battery system is in a charging state, that is, a power source is connected to the battery system, and the power source is used for charging the battery 10 of the battery system. When the battery monitoring unit 11 monitors that the current flowing through the battery 10 is greater than the third threshold, the battery 10 monitoring unit 11 sends a fifth control signal to the fourth switching unit 132, and the fifth control signal is used for closing the fourth switching unit 132. The battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is smaller than the voltage of the positive electrode of the battery system and the current flowing through the battery is greater than a fourth threshold value, the battery monitoring unit 11 sends a sixth control signal to the third switching unit 122, and the sixth control signal is used for closing the third switching unit 122.
Optionally, when the fourth switching unit 132 and the battery monitoring unit 11 collect electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system, the battery system is in an abnormal condition, for example, the abnormal condition may be a condition that a large current is charged each other when the battery systems are used in parallel, the battery monitoring unit 11 sends a seventh control signal to the fourth switching unit 132, and the seventh control signal is used to disconnect the fourth switching unit 132, so that the large current mutual charging of the battery system is avoided, and the safety of the battery system is ensured.
Optionally, after the fourth switching unit 132 is turned on, the battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery is smaller than a fourth threshold, the battery 10 of the battery system is fully charged, the battery monitoring unit 11 sends an eighth control signal to the third switching unit 122 and the fourth switching unit 132, respectively, and the eighth control signal is used for disconnecting the third switching unit 122 and the fourth switching unit 132, so that a circuit is disconnected when the battery 10 is fully charged in the charging process of the battery system, and the safety of the battery system is ensured.
An embodiment of the utility model provides a battery system and battery system group, include: the battery management device comprises a battery monitoring unit, a first switch circuit and a second switch circuit, wherein the first switch circuit and the second switch circuit are connected in series; the battery monitoring unit is respectively connected with the positive electrode of the battery, the positive electrode of the battery system, the third switching unit and the fourth switching unit, and the battery monitoring unit is used for controlling the switching states of the third switching unit and the fourth switching unit according to electric signals of the positive electrode of the battery and the positive electrode of the battery system. In the process, the battery monitoring unit can control the fourth switch unit to be closed according to the positive electrode of the battery and the electric signals of the positive electrodes of the battery systems, and when the battery monitoring unit monitors that the electric signals of the two ends of the battery are normal, the third switch unit is controlled to be closed, so that after the fourth switch unit is closed and a plurality of battery systems are used in parallel and the capacities of the batteries are different, the battery monitoring unit can monitor the abnormal electric signals of the two ends of the battery, the third switch unit is controlled to be kept in an open state, the phenomenon of mutual charging of large currents when the battery systems with different capacities are connected in parallel is prevented, and the safety of the battery systems is improved.
Based on the above-described embodiment, the structure of the battery system shown in fig. 1 will be described in further detail below with reference to fig. 2 to 4.
Fig. 2 is a schematic structural diagram of another battery system according to an embodiment of the present invention. Referring to fig. 2, the first switching unit 121 includes a first resistor 1211 and a first PMOS transistor 1212, wherein the first resistor 1211 is connected in series with the first PMOS transistor 1212; the drain of the first PMOS transistor 1212 is connected to the positive electrode of the battery 10, the source of the first PMOS transistor 1212 is connected to the second switch circuit 13, and the gate of the first PMOS transistor 1212 is connected to the battery monitoring unit 11.
The second switch unit 131 includes a second resistor 1311 and a second PMOS transistor 1312, wherein the second resistor 1311 and the second PMOS transistor 1312 are connected in series; the drain of the second PMOS transistor 1312 is connected to the negative electrode of the battery 10, the source of the second PMOS transistor 1312 is connected to the first switching circuit 12, and the gate of the second PMOS transistor 1312 is connected to the battery monitoring unit 11.
The third switching unit 122 is a first NMOS transistor 1222, wherein a source of the first NMOS transistor 1222 is connected to a positive electrode of the battery 10, a drain of the first NMOS transistor 1222 is connected to the second switching circuit 13, a gate of the first NMOS transistor 1222 is connected to the battery monitoring unit 11, and the battery monitoring unit 11 is configured to control the first NMOS transistor 1222 to be turned on or off.
The fourth switch unit 132 is a second NMOS transistor 1322, wherein a source of the second NMOS transistor 1322 is connected to a negative electrode of the battery 10, a drain of the second NMOS transistor 1322 is connected to the first switch circuit 12, a gate of the second NMOS transistor 1322 is connected to the battery 10 monitoring unit 11, and the battery monitoring unit 11 is configured to control the second NMOS transistor 1322 to be turned on or off.
The resistors may include wire-wound resistors, metal film resistors, fuse resistors, carbon composite resistors, sliding varistors, etc., and the first resistor 1211 and the second resistor 1311 may be the same or different, and the present invention is not limited thereto.
Optionally, the resistance of the first resistor 1211 is greater than or equal to a first threshold, and the first threshold may be a minimum value of the resistance of the first resistor 1211 required when the battery system enters the pre-charge mode; the resistance of the second resistor 1311 is greater than or equal to a second threshold, which may be the minimum value of the resistance of the second resistor 1311 required when the battery system enters the pre-charge mode. Optionally, the first threshold and the second threshold may be the same or different, and the present invention is not limited thereto.
The MOS Transistor is an abbreviation of a MOSFET, and refers to a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and a gate of the MOS Transistor can be used to control the on/off of a source and a drain of the MOS Transistor. The MOS tube is divided into a PMOS tube and an NMOS tube, wherein the PMOS tube is a field effect transistor with a P-type channel, and the NMOS tube is a field effect transistor with an N-type channel. In general, the PMOS transistor and the NMOS transistor are used as electronic switches, which can reduce input impedance, reduce circuit driving power, and increase switching speed. Optionally, a parasitic diode (shown in fig. 2) may be included between the source and the drain of the first PMOS transistor 1212, the second PMOS transistor 1312, the first NMOS transistor 1222, and the second NMOS transistor 1322 for protecting the MOS transistor when the MOS transistor meets a preset condition, where the preset condition may include that the voltage of the source and the drain of the MOS transistor exceeds a fifth threshold and/or that the source and the drain of the MOS transistor are reversely connected.
The battery monitoring unit 11 is respectively connected to the gates of the first PMOS transistor 1212, the second PMOS transistor 1312, the first NMOS transistor 1222, and the second NMOS transistor 1322, and the battery monitoring unit 11 may respectively set voltages of the gates of the first PMOS transistor 1212, the second PMOS transistor 1312, the first NMOS transistor 1222, and the second NMOS transistor 1322, and close or open the first PMOS transistor 1212, the second PMOS transistor 1312, the first NMOS transistor 1222, or the second NMOS transistor 1322 by adjusting the voltage value.
In practical applications, the battery monitoring unit 11 may control the first PMOS transistor 1212, the second PMOS transistor 1312, the first NMOS transistor 1222, or the second NMOS transistor 1322 of the battery system to be closed, and specifically, the battery monitoring unit 11 may control the gate of the first PMOS transistor 1212 or the second PMOS transistor 1312 to be at a low level, so as to close the first PMOS transistor 1212 or the second PMOS transistor 1312. When the first PMOS transistor 1212 or the second PMOS transistor 1312 is turned off, the battery monitoring unit 11 may control the gate of the first PMOS transistor 1212 or the second PMOS transistor 1312 to be at a high level respectively; the battery monitoring unit 11 may control the gate of the first NMOS transistor 1222 or the second NMOS transistor 1322 to be at a high level, thereby closing the first NMOS transistor 1222 or the second NMOS transistor 1322, respectively, and when the first NMOS transistor 1222 or the second NMOS transistor 1322 is opened, the battery monitoring unit 11 may control the gate of the first NMOS transistor 1222 or the second NMOS transistor 1322 to be at a low level, respectively. Therefore, it is possible to reduce the input impedance of the battery system, reduce the circuit driving power, and improve the switching speed.
Fig. 3 is a schematic structural diagram of another battery system according to an embodiment of the present invention. Referring to fig. 3, the battery system further includes an MCU14, wherein the MCU14 is connected to the battery monitoring unit 11, the third switching unit 122 and the fourth switching unit 132, respectively, and the battery monitoring system is configured to control the switching states of the third switching unit 122 and the fourth switching unit 132 through the MCU 14.
The MCU14 is a Micro Controller Unit (MCU) that appropriately reduces the frequency and specification of a Central Processing Unit (CPU), integrates the peripheral interfaces such as a memory, a counter, analog-to-digital conversion, and digital-to-analog conversion on a single chip, and forms a chip-level computer for different applications.
Alternatively, the MCU14 may be connected to the battery monitoring unit 11 via a bus. Optionally, the bus may include a serial bus, and may also include a parallel bus, wherein the serial bus may include IIC bus, PCI bus, SPI bus, CAN bus, and the parallel bus may include Q-bus, PCI-104 bus, to this, the utility model discloses do not specifically limit.
Optionally, the battery system may further include a power supply module, where the power supply module is connected to the battery monitoring unit and the MCU14, and the power supply module is configured to supply power to the battery monitoring unit 11 and the MCU 14.
Optionally, power module can be DCDC power module, dry battery etc. to this the utility model discloses do not specifically restrict.
In practical applications, the MCU14 may set an initial state of the battery system, which may be that the first and second switch units 121 and 131 are in a closed state, and a first threshold, which may be the amount of current flowing through the battery 10 when the battery system is discharged. Specifically, the MCU14 may set a first threshold value of the battery monitoring unit 11 and send a control signal to the battery monitoring unit 11 to close the first and second switching units 121 and 131, thereby setting an initial state of the battery system and the first threshold value.
When a load or a power supply is connected to the battery system, the battery monitoring unit 11 monitors the voltage of the positive electrode of the battery 10 and the voltage of the positive electrode of the battery system, and when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than the first threshold, the battery monitoring unit 11 recognizes that the battery system is in a discharging state and sends a recognition signal to the MCU14, that is, the load is connected to the battery system and needs to be powered. The MCU14 sends a first control signal to the fourth switching unit 132 according to the identification signal, the first control signal being used to close the fourth switching unit 132. At this time, the battery system enters a pre-discharge mode. In the pre-discharge mode, the battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a second threshold value, the battery monitoring unit 11 sends a discharge signal to the MCU14, and the MCU14 sends a second control signal to the third switching unit 122 according to the discharge signal, where the second control signal is used to close the third switching unit 122.
When the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is less than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than the third threshold, the battery monitoring unit 11 recognizes that the battery system is in a charging state and sends an identification signal to the MCU14, that is, the power supply connected to the battery system is used for charging the battery 10 of the battery system. The MCU14 sends a fifth control signal to the fourth switching unit 132 according to the identification signal, the fifth control signal being used to close the fourth switching unit 132. At this time, the battery system enters a pre-charge mode. In the pre-charge mode, the battery monitoring unit 11 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, when the battery monitoring unit 11 monitors that the voltage of the positive electrode of the battery 10 is less than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a fourth threshold value, the battery monitoring unit 11 sends a charge signal to the MCU14, and the MCU14 sends a sixth control signal to the third switching unit 122 according to the charge signal, wherein the sixth control signal is used for closing the third switching unit 122.
Fig. 4 is a schematic structural diagram of another battery system according to an embodiment of the present invention. Referring to fig. 4, the battery monitoring unit 11 may include a chip AFE Bq76952, which is an analog front end controlled by the MUC and may implement battery pack monitoring, balancing, and protection functions. The battery system can be connected with 3-6 lithium ion and lithium polymer batteries in series. In the practical application process, the chip can monitor the voltage, current and temperature information of each battery 10, and send the acquired voltage, current and temperature information of the batteries 10 to the MCU14, and the MCU14 determines whether the battery system is in an abnormal state according to the voltage, current and temperature information of the batteries 10, where the abnormal state may include overvoltage, undervoltage, overheating, overcurrent, battery power imbalance, and the like. Optionally, the chip is connected to the first NMOS 1222 and the second NMOS 1322 respectively, and is configured to control the closing of the first NMOS 1222 and the second NMOS 1322. The chip is connected with the positive electrode of the battery through a diode D7, a resistor R7, a resistor R8 and a resistor R9, and the pin LD hall pin PACK of the chip AFE Bq76952 is connected with the positive electrode of the battery system through a resistor R3 and a resistor R4. Optionally, the chip AFE Bq76952 is also connected to the negative electrode of the battery through a resistor R4.
Optionally, the MCU14 of the battery system may include a chip S32K14, which is a micro control unit manufactured by enzima corporation, and includes an IO interface, a clock unit, a digital-to-analog conversion unit, a network communication unit, and the like, and may be connected to the chip AFE Bq76952 through an IIC bus, so as to implement communication with the battery monitoring unit. Optionally, the chip may be connected to the first PMOS transistor 1212 and the second PMOS transistor 1312 through the MOS driver chip, respectively, so as to control the first PMOS transistor 1212 and the second PMOS transistor 1312 to be closed.
Optionally, the chip S32K14 may control the first PMOS transistor 1212 and the second PMOS transistor 1312 to be closed through a MOS driving circuit, where the MOS driving circuit is connected to the chip S32K14, the first PMOS transistor 1212, and the second PMOS transistor 1312, specifically, the MOS driving circuit may include a transistor D8, a transistor D9, a resistor R10, and a resistor R11, where the resistor R10 is connected to the transistor D9 and the resistor R11, respectively, and the transistor D8 is connected to the transistor D9. Optionally, the chip S32K14 may receive a message sent by the chip AFE Bq76952 through the IIC bus and send a control message to the chip AFE Bq 76952.
Optionally, the battery system may include a power supply unit, and the power supply unit is respectively connected to the chip AFE Bq76952 and the chip S32K14, and optionally, the power supply unit may be connected to the chip AFE Bq76952 through a diode D5 and a transistor D6. Alternatively, the power supply unit may supply 5V to the chip S32K 14.
Optionally, the battery system may further include a fuse F1 for implementing over-temperature protection or over-current protection of the battery system.
Optionally, the battery system may further include a resistor R5 for shunting when the chip AFE Bq76952 collects the current of the battery 10, thereby protecting the battery system.
Next, the operation of the battery system will be described in detail.
The chip S32K14 may set an initial state of the battery system and a first threshold value, i.e., the chip S32K14 closes the first PMOS transistor 1212 and the second PMOS transistor 1312 through MOS driving, and sets a first threshold value of the chip AFE Bq 76952.
The chip AFE Bq76952 may monitor a voltage of the positive electrode of the battery 10 and a voltage of the positive electrode of the battery system, and when the chip AFE Bq76952 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a first threshold, the chip AFE Bq76952 may recognize that the battery system is in a discharge state, that is, a load is connected to the battery system and power needs to be supplied to the load. The chip AFE Bq76952 sends a first control signal to the second NMOS transistor 1322, and the first control signal is used for closing the second NMOS transistor 1322. At this time, the battery system enters a pre-discharge mode. In the pre-discharge mode, the chip AFE Bq76952 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the chip AFE Bq76952 monitors that the voltage of the positive electrode of the battery 10 is greater than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a second threshold value, the chip AFE Bq76952 sends a second control signal to the first NMOS transistor 1222, and the second control signal is used for closing the first NMOS transistor 1222.
When the chip AFE Bq76952 monitors that the voltage of the positive electrode of the battery 10 is less than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than the third threshold value, the chip AFE Bq76952 identifies that the battery system is in a charging state, that is, a power source is connected to the battery system and is used for charging the battery 10 of the battery system. The chip AFE Bq76952 sends a fifth control signal to the second NMOS transistor 1322 according to the identification signal, and the fifth control signal is used for closing the second NMOS transistor 1322. At this time, the battery system enters a pre-charge mode. In the pre-charge mode, the chip AFE Bq76952 collects electrical signals of the positive electrode of the battery 10 and the positive electrode of the battery system, and when the chip AFE Bq76952 monitors that the voltage of the positive electrode of the battery 10 is less than the voltage of the positive electrode of the battery system and the current flowing through the battery 10 is greater than a fourth threshold value, the chip AFE Bq76952 sends a sixth control signal to the first NMOS transistor 1222, and the sixth control signal is used for closing the first NMOS transistor 1222.
On the basis of the above-described embodiment, an application of the above-described battery system will be described below with reference to fig. 5 to 6.
Fig. 5 is a battery system set according to an embodiment of the present invention. Referring to fig. 5, at least two battery systems are connected in series, and two battery systems are shown in series, wherein the negative electrode of the first battery system is connected to the positive electrode of the second battery system, and the load or the power source is connected to the positive electrode of the first battery system and the negative electrode of the second battery system, respectively.
Alternatively, the battery system set may include two or more battery systems, wherein the battery 10 in each battery system may include one or more batteries, which is not particularly limited by the present invention.
In the practical application process, each battery system includes a corresponding battery monitoring unit 11 to monitor each battery system, and please refer to the working process of a single battery system, which is not described herein again.
Fig. 6 is another battery system set according to an embodiment of the present invention. Referring to fig. 6, at least two battery systems are connected in parallel, and two battery systems are shown in parallel, wherein a positive electrode of the first battery system is connected to a positive electrode of the second battery system, a negative electrode of the first battery system is connected to a negative electrode of the second battery system, and a load or a power source is connected to the positive electrode and the negative electrode of the first battery system, respectively.
Alternatively, the battery system set may include two or more battery systems, wherein the battery in each battery system may include one or more batteries, which is not particularly limited by the present invention.
In the practical application process, each battery system includes a corresponding battery monitoring unit 11 for monitoring each battery system, and please refer to the working process of a single battery system, which is not described herein again.
Optionally, when the battery system includes at least two battery systems, and the at least two battery systems are connected in parallel, if there is a difference in battery capacity between the battery systems, the battery system group may preferentially discharge the battery system with a large battery capacity, and when the battery capacities of the battery systems in the battery system group are the same, the battery systems may simultaneously perform a discharge operation, and the discharge process is described in detail below with reference to fig. 6.
Referring to fig. 6, in the discharging process, when there is a difference in battery capacity between the parallel connection system groups, for example, when the battery capacity of the first battery system is greater than that of the second battery system, and the first battery system and the second battery system enter the pre-charging mode, the first battery monitoring unit 11 collects electrical signals of the positive electrode of the first battery and the positive electrode of the first battery system, and when the first battery monitoring unit 11 monitors that the voltage of the positive electrode of the first battery is greater than that of the positive electrode of the first battery system and the current flowing through the battery 10 is greater than a second threshold, the first battery monitoring unit 11 sends a second control signal to the third switching unit 122, and the second control is used to close the third switching unit 122; the second battery monitoring unit 11 collects electrical signals of the positive electrode of the second battery 10 and the positive electrode of the second battery system, because the battery capacity of the first battery system is greater than the battery capacity of the second battery system, at this time, the voltage of the positive electrode of the second battery 10 is less than the voltage of the positive electrode of the second battery system, when the second battery monitoring unit 11 monitors that the voltage of the positive electrode of the second battery 10 is less than the voltage of the positive electrode of the second battery system, the second battery monitoring unit 11 does not send a control signal for closing the third switching unit 122, at this time, the first battery system discharges, and the second battery system is in a pre-discharge mode, so when different battery systems have capacity differences, the battery system set can avoid the phenomenon of mutual charging of large currents. Thus improving the safety of the battery system.
An embodiment of the utility model provides a battery system and battery system group, include: the battery management device comprises a battery monitoring unit, a first switch circuit and a second switch circuit, wherein the first switch circuit and the second switch circuit are connected in series; the battery monitoring unit is respectively connected with the positive electrode of the battery, the positive electrode of the battery system, the third switching unit and the fourth switching unit, and the battery monitoring unit is used for controlling the switching states of the third switching unit and the fourth switching unit according to electric signals of the positive electrode of the battery and the positive electrode of the battery system. In the process, the battery monitoring unit can control the fourth switch unit to be closed according to the positive electrode of the battery and the electric signals of the positive electrodes of the battery systems, and when the battery monitoring unit monitors that the electric signals of the two ends of the battery are normal, the third switch unit is controlled to be closed, so that after the fourth switch unit is closed and a plurality of battery systems are used in parallel and the capacities of the batteries are different, the battery monitoring unit can monitor the abnormal electric signals of the two ends of the battery, the third switch unit is controlled to be kept in an open state, the phenomenon of mutual charging of large currents when the battery systems with different capacities are connected in parallel is prevented, and the safety of the battery systems is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and not to limit the same; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (10)
1. A battery system, comprising: a battery and a battery management device comprising a battery monitoring unit, a first switching circuit and a second switching circuit, wherein,
the first switch circuit and the second switch circuit are connected in series, the first switch circuit comprises a first switch unit and a third switch unit which are connected in parallel, and the second switch circuit comprises a second switch unit and a fourth switch unit which are connected in parallel;
the battery monitoring unit is respectively connected with the positive electrode of the battery, the positive electrode of the battery system, the third switching unit and the fourth switching unit, and the battery monitoring unit is used for controlling the switching states of the third switching unit and the fourth switching unit according to electric signals of the positive electrode of the battery and the positive electrode of the battery system.
2. The battery system of claim 1, wherein the first switching unit comprises a first resistor and a first PMOS transistor, wherein,
the first resistor is connected with the first PMOS tube in series;
the drain electrode of the first PMOS tube is connected with the anode of the battery, the source electrode of the first PMOS tube is connected with the second switch circuit, and the grid electrode of the first PMOS tube is connected with the battery monitoring unit.
3. The battery system according to claim 2, wherein the resistance value of the first resistor is greater than or equal to a first threshold value.
4. The battery system of claim 1, wherein the second switching unit comprises a second resistor and a second PMOS tube, wherein,
the second resistor is connected with the second PMOS tube in series;
the drain electrode of the second PMOS tube is connected with the negative electrode of the battery, the source electrode of the second PMOS tube is connected with the first switch circuit, and the grid electrode of the second PMOS tube is connected with the battery monitoring unit.
5. The battery system according to claim 4, wherein the resistance value of the second resistor is greater than or equal to a second threshold value.
6. The battery system according to claim 1, wherein the third switching unit is a first NMOS transistor, wherein,
the source electrode of the first NMOS tube is connected with the anode of the battery, the drain electrode of the first NMOS tube is connected with the second switch circuit, the grid electrode of the first NMOS tube is connected with the battery monitoring unit, and the battery monitoring unit is used for controlling the first NMOS tube to be switched on or switched off.
7. The battery system of claim 1, wherein the fourth switching unit is a second NMOS transistor, wherein,
the source electrode of the second NMOS tube is connected with the negative electrode of the battery, the drain electrode of the second NMOS tube is connected with the first switch circuit, the grid electrode of the second NMOS tube is connected with the battery monitoring unit, and the battery monitoring unit is used for controlling the second NMOS tube to be switched on or switched off.
8. The battery system of any of claims 1-7, further comprising an MCU, wherein,
the MCU is respectively connected with the battery monitoring unit, the third switch unit and the fourth switch unit, and the battery monitoring system is used for controlling the on-off states of the third switch unit and the fourth switch unit through the MCU.
9. The battery system of claim 8, further comprising a power module, wherein,
the power supply module is respectively connected with the battery monitoring power supply and the MCU, and the power supply module is used for supplying power to the battery monitoring power supply and the MCU.
10. A battery system pack comprising at least two battery systems according to any one of claims 1 to 9;
the at least two battery systems are connected in series; alternatively, the first and second electrodes may be,
the at least two battery systems are connected in parallel.
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| CN115579999A (en) * | 2022-11-10 | 2023-01-06 | 苏州绿恺动力电子科技有限公司 | Battery operation management system and battery operation management method |
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| CN115579999A (en) * | 2022-11-10 | 2023-01-06 | 苏州绿恺动力电子科技有限公司 | Battery operation management system and battery operation management method |
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