CN114614513A - Lithium battery control device and control method - Google Patents
Lithium battery control device and control method Download PDFInfo
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- CN114614513A CN114614513A CN202011407726.9A CN202011407726A CN114614513A CN 114614513 A CN114614513 A CN 114614513A CN 202011407726 A CN202011407726 A CN 202011407726A CN 114614513 A CN114614513 A CN 114614513A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
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Abstract
本发明实施例公开了一种锂电池控制装置及控制方法，其中锂电池控制装置包括，液态锂电池回路、固态锂电池回路、电压传感器以及控制部；液态锂电池回路和固态锂电池回路并联；液态锂电池回路包括液态锂电池组和第一控制开关；液态锂电池组和第一控制开关串联；固态锂电池回路包括固态锂电池组、第二控制开关和限流电阻；固态锂电池组、第二控制开关和限流电阻串联；固态锂电池回路还包括第三控制开关；第二控制开关以及限流电阻与第三控制开关并联；本发明实施例解决了液态锂电池组和固态锂电池组一起使用时，电池组电压不匹配的问题，同时实现了液态锂电池组和固态锂电池组寿命近乎一致。
The embodiment of the invention discloses a lithium battery control device and a control method, wherein the lithium battery control device includes a liquid lithium battery circuit, a solid lithium battery circuit, a voltage sensor and a control part; the liquid lithium battery circuit and the solid lithium battery circuit are connected in parallel; The liquid lithium battery circuit includes a liquid lithium battery pack and a first control switch; the liquid lithium battery pack and the first control switch are connected in series; the solid-state lithium battery circuit includes a solid-state lithium battery pack, a second control switch and a current limiting resistor; the solid-state lithium battery pack, The second control switch and the current-limiting resistor are connected in series; the solid-state lithium battery circuit further includes a third control switch; the second control switch and the current-limiting resistor are connected in parallel with the third control switch; the embodiment of the present invention solves the problem of the liquid lithium battery pack and the solid-state lithium battery When the battery packs are used together, the battery pack voltage does not match the problem, and at the same time, the lifespan of the liquid lithium battery pack and the solid-state lithium battery pack is almost the same.
Description
Technical Field
The embodiment of the invention relates to a rechargeable battery technology, in particular to a lithium battery control device and a control method.
Background
Solid-state lithium battery technology is an advanced battery technology, and unlike commonly used liquid-state lithium batteries, solid-state lithium batteries use solid electrodes and solid electrolytes. Compared with a liquid lithium battery, the solid lithium battery has the advantages of good safety and high energy density, and the energy density of the solid lithium battery can be more than three times that of the liquid lithium battery. However, the current solid-state lithium battery has some short plates, such as poor power performance, short cycle life and the like. In some fields of application, a lithium battery is required to have high energy density and power density at the same time, and the requirement of high energy and high power is difficult to meet by using one type of lithium battery.
Therefore, at present, the solid-state battery and the liquid-state battery are generally used in a mixed manner, and the assembled battery has both the high-power characteristic of the liquid-state battery and the high-energy characteristic of the solid-state battery.
However, the battery pack formed by the scheme has some problems, and the performance parameters of the two types of batteries are different, such as voltage range, charge and discharge multiplying power and the like. For example, the voltage range of the liquid ternary lithium battery monomer is generally 2.7V-4.2V, the normal-temperature cycle life can reach 1500 times, and the rated discharge rate is 3-5C; at present, the voltage range of a solid lithium battery monomer is generally 2.5V-4.7V, the cycle life is generally about 500 times, the rated discharge rate is 1-2C, and direct parallel connection use easily causes mismatching of battery voltage and shortening of battery life.
Disclosure of Invention
The invention provides a lithium battery control device and a control method, which are used for solving the problems of mismatching of battery voltage and shortened battery service life when a liquid lithium battery and a solid lithium battery are used together.
In a first aspect, an embodiment of the present invention provides a lithium battery control device, including:
a liquid lithium battery circuit, a solid lithium battery circuit and a control part; the liquid lithium battery loop and the solid lithium battery loop are connected in parallel;
the liquid lithium battery loop comprises a liquid lithium battery pack and a first control switch; the liquid lithium battery pack is connected with the first control switch in series;
the solid lithium battery loop comprises a solid lithium battery pack, a second control switch and a current-limiting resistor; the solid-state lithium battery pack, the second control switch and the current-limiting resistor are connected in series; the solid-state lithium battery loop further comprises a third control switch; the second control switch and the current-limiting resistor are connected with the third control switch in parallel;
a voltage sensor; the voltage sensor is used for acquiring the current voltage value of the liquid lithium battery pack and the current voltage value of the solid lithium battery pack;
the control part is used for responding to a discharging instruction or a charging instruction and controlling the on-off of the first control switch, the second control switch and the third control switch according to the current voltage value of the liquid lithium battery pack and the current voltage value of the solid lithium battery pack.
Optionally, the system further comprises a single battery equalizer; the voltage sensor is also used for acquiring the current voltage of each single battery of the liquid lithium battery pack and the current voltage of each single battery of the solid lithium battery pack; the single battery equalizer is used for controlling the voltage difference of each single battery of the liquid lithium battery pack to be smaller than a first threshold value and controlling the voltage difference of each single battery of the solid lithium battery pack to be smaller than a second threshold value in the discharging process.
Optionally, the system further comprises a current sensor, wherein the current sensor is used for detecting the current value of the liquid lithium battery circuit and/or the current value of the solid lithium battery circuit and transmitting the current value to the control part; the control part controls the on-off of the first control switch, the second control switch and the third control switch according to the current value of the liquid lithium battery loop and/or the current value of the solid lithium battery loop.
Optionally, the voltage sensor is further configured to obtain an output voltage of the lithium battery control device and transmit the output voltage to the control portion; the control part is used for alarming when the output voltage exceeds the threshold voltage range and/or controlling the on-off of the first control switch, the second control switch and the third control switch.
Optionally, the alarm device further comprises a switch state sensor, the switch state sensor is used for detecting the switch state of the first control switch, the second control switch or the third control switch and sending the switch state to the control part, and the control part is used for giving an alarm when the control state of the first control switch, the second control switch or the third control switch is inconsistent with the state sensed by the switch state sensor.
In a second aspect, an embodiment of the present invention further provides a lithium battery control method, which is applicable to any one of the lithium battery control apparatuses described above, and the method includes:
acquiring a discharging instruction or a charging instruction;
acquiring a current voltage value of the liquid lithium battery pack and a current voltage value of the solid lithium battery pack;
and responding to a discharging instruction or a charging instruction, and controlling the on-off of the first control switch, the second control switch and the third control switch according to the current voltage value of the liquid lithium battery pack and the current voltage value of the solid lithium battery pack.
Optionally, the controlling, in response to a discharging instruction or a charging instruction, the on/off of the first control switch, the second control switch, and the third control switch according to a current voltage value of the liquid-state lithium battery pack and a current voltage value of the solid-state lithium battery pack includes:
responding to the discharge instruction, and judging the magnitude relation between the current voltage value of the liquid lithium battery pack and the current voltage value of the solid lithium battery pack;
if the current voltage value of the liquid lithium battery pack is smaller than or equal to the current voltage value of the solid lithium battery pack, controlling the first control switch and the second control switch to be switched on, and controlling the third control switch to be switched off;
and if the current voltage value of the liquid lithium battery pack is greater than the current voltage value of the solid lithium battery pack, the second control switch and the third control switch are controlled to be switched off, and the first control switch is switched on.
Optionally, the method further comprises, during the discharging:
and if the current voltage value of the liquid lithium battery pack is smaller than the discharge cut-off voltage of the liquid lithium battery pack or the current voltage value of the solid lithium battery pack is smaller than the discharge cut-off voltage of the solid lithium battery pack, controlling the first control switch, the second control switch and the third control switch to be switched off.
Optionally, the controlling, in response to a discharging instruction or a charging instruction, the on/off of the first control switch, the second control switch, and the third control switch according to a current voltage value of the liquid-state lithium battery pack and a current voltage value of the solid-state lithium battery pack includes:
responding to a charging instruction, and judging whether the absolute value of the difference value between the current voltage value of the liquid lithium battery pack and the current voltage value of the solid lithium battery pack is smaller than or equal to a preset threshold value or not;
if yes, controlling the first control switch and the third control switch to be connected, and controlling the second control switch to be disconnected; otherwise, judging whether the current voltage value of the liquid lithium battery pack is larger than the current voltage value of the solid lithium battery pack;
if yes, the first control switch and the second control switch are controlled to be turned off, and the third control switch is controlled to be turned on; otherwise, the second control switch and the third control switch are controlled to be turned off, and the first control switch is controlled to be turned on.
Optionally, the charging process further includes:
if the current voltage value of the liquid lithium battery pack reaches the rated voltage of the liquid lithium battery pack, controlling the first control switch to be switched off;
or if the current voltage value of the solid-state lithium battery pack reaches the rated voltage of the solid-state lithium battery pack, controlling the third control switch to be switched off.
According to the embodiment of the invention, the current-limiting resistor is connected in series when the solid lithium battery loop discharges, so that the discharge current of the solid lithium battery is reduced, and the voltage difference between the solid lithium battery pack and the liquid lithium battery pack is borne. And further, the discharge depth of the solid-state lithium battery pack is limited, and the cycle number of the solid-state lithium battery pack is reduced. The service life of the solid-state lithium battery pack is close to that of the liquid-state lithium battery pack. The control unit can switch the lithium battery control device between the charge and discharge states by controlling the first control switch, the second control switch, and the third control switch. The device can determine the charging and discharging states of the solid lithium battery pack and the liquid lithium battery pack according to the current voltage values of the solid lithium battery pack and the liquid lithium battery pack obtained by the voltage sensor, and then controls the first control switch, the second control switch and the third control switch to be turned on or turned off, so that the device is protected.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a lithium battery control device according to an embodiment of the present invention;
fig. 2 is a schematic general flow chart of a lithium battery control method according to an embodiment of the present invention;
fig. 3 is a schematic partial flow chart of a lithium battery control method according to an embodiment of the present invention;
description of the drawings:
1-liquid lithium battery pack, 2-solid lithium battery pack, 3-current sensor, 4-first control switch, 5-second control switch, 6-third control switch, 7-current limiting resistor, 8-liquid lithium battery loop and 9-solid lithium battery loop
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a lithium battery control device according to an embodiment of the present invention, and referring to fig. 1, the lithium battery control device includes a liquid lithium battery circuit 8, a solid lithium battery circuit 9, and a control unit (not shown in the figure); the liquid lithium battery loop 8 and the solid lithium battery loop 9 are connected in parallel; the liquid lithium battery loop 8 comprises a liquid lithium battery pack 1 and a first control switch 4; the liquid lithium battery pack 1 is connected with the first control switch 4 in series; the solid lithium battery loop 9 comprises a solid lithium battery pack 2, a second control switch 5 and a current limiting resistor 7; the solid-state lithium battery pack 2, the second control switch 5 and the current-limiting resistor 7 are connected in series; the solid-state lithium battery circuit 9 further comprises a third control switch 6; the second control switch 5 and the current limiting resistor 7 are connected with the third control switch 6 in parallel; a voltage sensor (not shown in the figure); the voltage sensor is used for acquiring the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2; the control part is used for responding to a discharging instruction or a charging instruction and controlling the on-off of the first control switch 4, the second control switch 5 and the third control switch 6 according to the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2.
The liquid lithium battery pack 1 and the solid lithium battery pack 2 can both comprise single batteries, and the single batteries can be connected in series, in parallel or in series-parallel. The first control switch 4, the second control switch 5 and the third control switch 6 are all devices for controlling the on/off of the circuit where the first control switch is located, and may be, for example, a relay, a MOS transistor, an IGBT transistor, and the like.
The current limiting resistor 7 is a resistor for limiting the current of the solid-state lithium battery circuit 9, and may be a constant value resistor or a variable value resistor. The resistance value can be determined according to the requirements of the actual application scene. When the current limiting resistor 7 is a variable resistor, it may be a positive temperature coefficient resistor (PTC resistor). When the current flowing through the positive temperature coefficient resistor is higher, the positive temperature coefficient resistor generates more heat, so that the resistance value of the positive temperature coefficient resistor is increased. When the voltage is constant, the current flowing through the circuit is in inverse proportion to the resistance of the circuit, so that the current flowing through the positive temperature coefficient resistor is reduced, negative feedback regulation of the current of the solid lithium battery loop 9 is formed, and the smaller and stable current of the solid lithium battery loop 9 is obtained. The current limiting resistor 7 may be other devices besides those described above, and the specific scheme thereof will be described in detail below.
Current limiting resistor 7 has reduced solid-state lithium battery loop 9's output current through the mode that increases solid-state lithium battery loop 9 total resistance, and then has reduced solid-state lithium battery group 2's depth of discharge, has delayed solid-state lithium battery group 2's decay rate, makes solid-state lithium battery group 2 possess with the liquid lithium battery group 1 life that basically the same.
The voltage sensor is a device for acquiring current voltage values of the liquid lithium battery pack 1 and the solid lithium battery pack 2, for example, the voltage sensor may be a device for determining the current voltage values of the liquid lithium battery pack 1 and the solid lithium battery pack 2 by measuring output port voltages of the liquid lithium battery pack 1 and the solid lithium battery pack 2, or may be a device for obtaining the current voltage values of the liquid lithium battery pack 1 and the solid lithium battery pack 2 by measuring single battery voltages of the liquid lithium battery pack 1 and the solid lithium battery pack 2 and performing calculation. The embodiment of the invention does not limit the specific type, working principle and model.
The control part is a device for controlling the on and off of the first control switch 4, the second control switch 5 and the third control switch 6 according to the discharging instruction or the charging instruction, the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2. Any device that can have the above functions may be used as the control unit in the embodiment of the present invention, and may be, for example, a battery management system. The control logic of the control section may be various, and one of them will be described below: when the control part receives a discharge instruction, the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2 are obtained, and when the voltage values are in a discharge voltage range, the control part controls the first control switch 4 and the second control switch 5 to be closed; when the control part receives a charging instruction, the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2 are obtained, and when the voltage values are in the charging voltage range, the control part controls the first control switch 4 and the third control switch 6 to be closed. Wherein the discharging voltage range and the charging voltage range can be determined according to actual requirements.
In other embodiments, the lithium battery control apparatus further includes a cell equalizer (not shown in the figure); the voltage sensor is also used for acquiring the current voltage of each single battery of the liquid lithium battery pack 1 and the current voltage of each single battery of the solid lithium battery pack 2; the single battery equalizer is used for controlling the voltage difference of each single battery of the liquid lithium battery pack 1 to be smaller than a first threshold value and controlling the voltage difference of each single battery of the solid lithium battery pack 2 to be smaller than a second threshold value in the discharging process.
The single battery equalizer is a device for controlling the voltage between each group of single batteries within a certain range, and the devices with the above functions can be used as the single battery equalizer. For the sake of simplicity, the solid-state lithium battery pack 2 will be taken as an example to describe one of the cell equalizers and the operation principle thereof.
The cell balancer may be a load-consuming balancer. The load consumption balancer is a circuit formed by connecting a discharge resistor and a control switch in series in parallel on each single battery, and the control switch of the load consumption balancer can be controlled by the single battery balancer or a control part. The working principle is that the control part determines the lowest voltage in the single batteries collected by the voltage sensor, and adds a second threshold value on the basis of the lowest voltage to obtain the highest normal voltage. And confirming the single battery with the voltage exceeding the highest normal voltage, closing the control switch of the single battery to discharge until the voltage of the single battery reaches the highest normal voltage, and disconnecting the control switch to stop discharging. Wherein the second threshold value can be set according to actual requirements. The load consumption balancer has the characteristics of simple structure and simple control logic, and is particularly suitable for the solid-state lithium battery pack 2 or the liquid-state lithium battery pack 1 with more single batteries.
In other embodiments, the lithium battery control device further comprises a current sensor 3, wherein the current sensor 3 is used for detecting the current value of the liquid lithium battery circuit 8 and/or the current value of the solid lithium battery circuit 9 and transmitting the current value to the control part; the control part controls the on-off of the first control switch 4, the second control switch 5 and the third control switch 6 according to the current value of the liquid lithium battery circuit 8 and/or the current value of the solid lithium battery circuit 9.
The current sensor 3 is a device for detecting a current value of the liquid lithium battery circuit 8 and/or a current value of the solid lithium battery circuit 9 and transmitting the detected current value to the control unit, and the current sensor 3 is of various types, such as an electronic current transformer and an electromagnetic current transformer, and the like. The working principle of the current sensor 3 can be that in the discharging process, the current value of the liquid lithium battery loop 8 and/or the current value of the solid lithium battery loop 9 are detected, when the current value of the liquid lithium battery loop 8 and/or the current value of the solid lithium battery loop 9 exceed a preset alarm threshold value, the control part alarms and requests an external control device connected with the device to reduce the output power; when the current value of the liquid lithium battery circuit 8 and/or the current value of the solid lithium battery circuit 9 both exceed the preset disconnection threshold value within a certain time, the battery circuit of which the current value exceeds the preset disconnection threshold value is disconnected by the control part, and forced power off is carried out. In the charging process, when the current sensor 3 detects that the current value of the liquid lithium battery circuit 8 and/or the current value of the solid lithium battery circuit 9 exceeds an alarm threshold value, the control part sends an alarm instruction through the external communication interface to request an external control device connected with the device to reduce the charging power; when the current value of the liquid lithium battery circuit 8 and/or the current value of the solid lithium battery circuit 9 exceeds a preset disconnection threshold value, the battery circuit with the current value exceeding the preset disconnection threshold value is disconnected by the control part, and forced power off is carried out. The alarm threshold value and the disconnection threshold value in the charging and discharging processes can be set according to actual requirements. It follows that the current sensor 3 improves the safety of the device.
On this basis, the current-limiting resistor 7 can also be a digital potentiometer, the digital potentiometer can be controlled by a control part, the resistance value is changed according to the current magnitude of the solid-state lithium battery loop 9, and the mapping relation between the resistance value of the digital potentiometer and the current magnitude of the solid-state lithium battery loop 9 can be determined according to the actual application scene.
In other embodiments, the voltage sensor of the lithium battery control device is further used for acquiring the output voltage of the lithium battery control device and transmitting the output voltage to the control part; the control part is used for alarming when the output voltage exceeds the threshold voltage range and/or controlling the on-off of the first control switch 4, the second control switch 5 and the third control switch 6.
The voltage sensor can also acquire the output voltage of the lithium battery control device, the voltage sensor can directly detect the output voltage of the device to obtain the output voltage of the device, and can also acquire the voltage of the single battery in the liquid lithium battery pack 1 through detection and calculate to obtain the output voltage of the device. The calculation mode needs to be determined according to the connection relation between the single batteries in actual use. In the discharging state, when the output voltage is lower than the lowest discharging voltage of the threshold voltage range or higher than the highest discharging voltage of the threshold voltage range, the control part can alarm the external control device connected with the device through the communication port. The control part can also disconnect the loop of the output voltage which is lower than the lowest discharge voltage of the threshold voltage range or higher than the highest discharge voltage of the threshold voltage range, or disconnect all loops by disconnecting the first control switch 4, the second control switch 5 and the third control switch 6, thereby ensuring the safety of the device. The lowest discharge voltage and the highest discharge voltage of the threshold voltage range can be determined according to actual needs.
In other embodiments, the lithium battery control device further includes a switch state sensor (not shown in the figure) for detecting the switch state of the first control switch 4, the second control switch 5 or the third control switch 6 and sending the switch state to the control part, and the control part is used for alarming when the control state of the first control switch 4, the second control switch 5 or the third control switch 6 is inconsistent with the state sensed by the switch state sensor.
The switch state sensor is a sensor for detecting the switch states of the first control switch 4, the second control switch 5 or the third control switch 6, the structure of the sensor is not limited in the embodiment of the invention, when the control switch is a relay, the switch state sensor can be a feedback device in the relay, the auxiliary contact of the relay feedback device transmits the switch state of the relay to the control part, and the control part detects whether the switch state of the relay is consistent with the switch state of the issued instruction or not; when the control switch is a MOS transistor or an IGBT transistor, a voltage detection device may be provided as a sensor for the switching state at both ends of the source and the drain, and the control unit may compare whether or not the voltages at both ends of the source and the drain are the same. If the two states are consistent, the control switch is in a normal state, and if the two states are inconsistent, the control switch is in an abnormal state. If the state is abnormal, the control part alarms to an external control device connected with the device through the communication port. Therefore, the actual state of the device can be confirmed, the alarm can be given in time, and the hidden danger can be eliminated as early as possible.
In other embodiments, the lithium battery control device further includes a single battery temperature sensor (not shown in the figure), the single battery temperature sensor is a sensor for detecting the temperature of a single battery of the liquid lithium battery pack 1 and/or the solid lithium battery pack 2, and is capable of transmitting the acquired temperature information to the control portion, when a single battery with a current temperature higher than an alarm temperature threshold exists in the single battery, the control portion alarms to an external control device connected to the device, and when a single battery with a current temperature higher than a power-off temperature threshold exists in the single battery, the control portion controls the first control switch 4, the second control switch 5, and the third control switch 6 to be turned off. The alarm temperature threshold and the power-off temperature threshold can be determined according to actual application scenarios.
In other embodiments, the lithium battery control device further comprises an insulation monitoring module (not shown in the figure), which may be any existing module, such as JYJC-32, JYJC-64, or IM-32EA, and may also be an auxiliary functional module of an existing battery management system. The insulation monitoring module can monitor the insulation condition of the lithium battery control device bus in real time, and when the insulation resistance of the lithium battery control device bus is lower than the preset insulation resistance, the control part gives an alarm to the external control device connected with the device. The preset insulation resistance can be determined according to actual use scenes.
On the other hand, an embodiment of the present invention discloses a lithium battery control method, which is suitable for any one of the above lithium battery control devices, and fig. 2 is a schematic general flow chart of the lithium battery control method provided in the embodiment of the present invention; referring to fig. 2, the method includes:
s110: acquiring a discharging instruction or a charging instruction;
s120: acquiring the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2;
s130: and responding to a discharging instruction or a charging instruction, and controlling the on-off of the first control switch 4, the second control switch 5 and the third control switch 6 according to the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2.
The discharging command or the charging command can be provided by an external control device connected with the device. In response to a discharging instruction or a charging instruction, and according to the current voltage value of the liquid-state lithium battery pack 1 and the current voltage value of the solid-state lithium battery pack 2, there may be a plurality of methods for controlling the on/off of the first control switch 4, the second control switch 5, and the third control switch 6, wherein one of the methods is to close the first control switch 4 and the second control switch 5 according to the obtained discharging instruction; according to the acquired charging instruction, the first control switch 4 and the third control switch 6 are closed. This control method is simple and can reduce the calculation pressure of the control unit.
In other embodiments, the controlling the on/off of the first control switch 4, the second control switch 5 and the third control switch 6 in response to the discharging instruction or the charging instruction and according to the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2 includes:
responding to the discharge instruction, and judging the magnitude relation between the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2;
if the current voltage value of the liquid lithium battery pack 1 is less than or equal to the current voltage value of the solid lithium battery pack 2, controlling the first control switch 4 and the second control switch 5 to be switched on, and switching off the third control switch 6;
if the current voltage value of the liquid lithium battery pack 1 is greater than the current voltage value of the solid lithium battery pack 2, the second control switch 5 and the third control switch 6 are controlled to be switched off, and the first control switch 4 is switched on.
According to the embodiment of the invention, the control switch of the solid-state lithium battery loop 9 can be disconnected in the state that the current voltage value of the liquid-state lithium battery pack 1 is larger than the current voltage value of the solid-state lithium battery pack 2 until the current voltage value of the liquid-state lithium battery pack 1 is equal to the current voltage value of the solid-state lithium battery pack 2. The problem that the current of the liquid lithium battery pack 1 flows backwards to the solid lithium battery pack 2 is solved, and the problem that the solid lithium battery pack 2 increases the charging and discharging cycle times is solved, so that the service life of the solid lithium battery pack 2 is shortened.
In other embodiments, the discharging further comprises:
and if the current voltage value of the liquid lithium battery pack 1 is smaller than the discharge cut-off voltage of the liquid lithium battery pack 1, or the current voltage value of the solid lithium battery pack 2 is smaller than the discharge cut-off voltage of the solid lithium battery pack 2, controlling the first control switch 4, the second control switch 5 and the third control switch 6 to be switched off.
According to the embodiment of the invention, when any one of the solid lithium battery pack 2 and the liquid lithium battery pack 1 finishes discharging, the device finishes discharging. Because solid-state lithium cell group 2 finishes voltage of discharging and generally is less than liquid lithium cell group 1 and finishes voltage of discharging, and because the partial pressure effect of current-limiting resistor 7, after first control switch 4 and second control switch 5 switched on for a period of time, solid-state lithium cell group 2 current voltage value should be higher than liquid lithium cell group 1 current voltage value, so under the general condition, when liquid lithium cell group 1 accomplished discharging, solid-state lithium cell group 2 still had the electric quantity. Therefore, the discharging depth of the solid-state lithium battery pack 2 can be better reduced, and the service life of the solid-state lithium battery pack 2 is closer to that of the liquid-state lithium battery pack 1.
In other embodiments, referring to fig. 3, the controlling the on/off of the first control switch 4, the second control switch 5 and the third control switch 6 in response to the discharging instruction or the charging instruction and according to the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2 includes:
responding to the charging instruction, and judging whether the absolute value of the difference value between the current voltage value of the liquid lithium battery pack 1 and the current voltage value of the solid lithium battery pack 2 is less than or equal to a preset threshold value or not;
if yes, controlling the first control switch 4 and the third control switch 6 to be switched on, and controlling the second control switch 5 to be switched off; otherwise, judging whether the current voltage value of the liquid lithium battery pack 1 is larger than the current voltage value of the solid lithium battery pack 2;
if yes, the first control switch 4 and the second control switch 5 are controlled to be turned off, and the third control switch 6 is controlled to be turned on; otherwise, the second control switch 5 and the third control switch are controlled to be turned off, and the first control switch 4 is controlled to be turned on.
According to the embodiment of the invention, when the voltage difference between the two battery packs is too high, the battery pack with low voltage is independently charged until the voltages of the two battery packs are equal, and the two battery packs are charged in parallel. Or after the battery pack with low voltage is fully charged, another battery pack is charged. The damage to the battery pack caused by overhigh charging voltage is avoided.
In other embodiments, the charging process further comprises:
if the current voltage value of the liquid lithium battery pack 1 reaches the rated voltage of the liquid lithium battery pack 1, controlling the first control switch 4 to be switched off;
or, if the current voltage value of the solid-state lithium battery pack 2 reaches the rated voltage of the solid-state lithium battery pack 2, controlling the third control switch 6 to be switched off.
According to the embodiment of the invention, after any battery pack is charged, the corresponding control switch is disconnected. The battery pack is prevented from being overcharged, and the service life of the battery pack is prevented from being influenced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
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| CN119834412A (en) * | 2024-12-24 | 2025-04-15 | 深圳比瓦特科技有限公司 | Control method of hybrid battery management circuit and hybrid battery management circuit |
| WO2025248905A1 (en) * | 2024-05-31 | 2025-12-04 | パナソニックＩｐマネジメント株式会社 | Shut-off system and control method |
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