CN217467114U - Battery health state monitoring device and monitoring circuit - Google Patents
Battery health state monitoring device and monitoring circuit Download PDFInfo
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- CN217467114U CN217467114U CN202221405339.6U CN202221405339U CN217467114U CN 217467114 U CN217467114 U CN 217467114U CN 202221405339 U CN202221405339 U CN 202221405339U CN 217467114 U CN217467114 U CN 217467114U
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Abstract
The application relates to a battery health state monitoring device and a monitoring circuit, and belongs to the technical field of batteries. Wherein, a battery state of health monitoring devices includes: the device comprises a battery module, an electric energy conversion module, a control module and a load; the first end of the battery module is connected with the input end of the electric energy conversion module; the second end of the battery module is connected with the first end of the load; the output end of the electric energy conversion module is connected with the second end of the load; the output end of the control module is connected with the control end of the electric energy conversion module; the control module is used for outputting a switching signal to the electric energy conversion module so as to adjust the duty ratio output by the electric energy conversion module. The device sets up the electric energy conversion module in battery module's operating circuit, is convenient for monitor battery module's battery health under the operating condition, and the convenient health of in time mastering battery module.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery health state monitoring device and a monitoring circuit.
Background
With the continuous deepening of the environmental protection idea and the green idea, vehicles such as electric automobiles and electric bicycles are more and more popularized, and the performance requirements of people on batteries are higher and higher. In order to ensure smooth traffic, the phenomenon of anchorage caused by the problem of the battery on the half way is avoided, and how to timely master the health state of the battery becomes a more and more concerned thing for people who choose the electric vehicle to go out, but at present, the health state of the battery needs to be sold, maintained and the like, and special equipment is adopted, so that the battery is inconvenient to use.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem of how to conveniently monitor the health state of a battery, the application provides a battery health state monitoring device and a monitoring circuit.
In a first aspect, the present application provides a battery state of health monitoring device, the monitoring device comprising: the device comprises a battery module, an electric energy conversion module, a control module and a load;
the first end of the battery module is connected with the input end of the electric energy conversion module; the second end of the battery module is connected with the first end of the load;
the output end of the electric energy conversion module is connected with the second end of the load;
the output end of the control module is connected with the control end of the electric energy conversion module; the control module is used for outputting a switching signal to the electric energy conversion module so as to adjust the duty ratio output by the electric energy conversion module;
optionally, the power conversion module comprises a DC-DC converter;
the first end of the DC-DC converter is connected with the first end of the battery module, the second end of the DC-DC converter is connected with the second end of the battery module and the first end of the load, the third end of the DC-DC converter is connected with the second end of the load, the first control end of the DC-DC converter is connected with the first output end of the control module, and the second control end of the DC-DC converter is connected with the second output end of the control module;
optionally, the DC-DC converter comprises: the power supply comprises a first inductor, a first power tube, a second power tube and a first capacitor;
the first end of the first inductor is connected with the first end of the battery module, and the second end of the first inductor is connected with the first end of the first power tube and the first end of the second power tube;
the second end of the first power tube is connected with the first end of the first capacitor, the first end of the load and the second end of the battery module; the third end of the first power tube is connected with the first output end of the control module;
the second end of the second power tube is connected with the second end of the first capacitor and the second end of the load; the third end of the second power tube is connected with the second output end of the control module;
optionally, the battery module comprises a lithium battery; the positive electrode of the lithium battery is connected with the first end of the first inductor; the negative electrode of the lithium battery is connected with the second end of the first power tube, the first end of the first capacitor and the first end of the load;
optionally, the first power transistor is a first MOS transistor, and the second power transistor is a second MOS transistor;
the drain electrode of the first MOS tube is connected with the second end of the first inductor and the drain electrode of the second MOS tube; the source electrode of the first MOS tube is connected with the first end of the first capacitor, the first end of the load and the negative electrode of the lithium battery; the grid electrode of the first MOS tube is connected with the first output end of the control module;
the source electrode of the second MOS tube is connected with the second end of the first capacitor and the second end of the load; the grid electrode of the second MOS tube is connected with the second output end of the control module;
optionally, the first MOS transistor and the second MOS transistor are both PMOS transistors;
optionally, the monitoring device further comprises a sampling module and a data analysis module;
the sampling module comprises a first sampling unit, a second sampling unit and a third sampling unit;
the first sampling unit is used for collecting voltages at two ends of the battery module; the second sampling unit is used for collecting the current of the electric energy conversion module; the third sampling unit is used for collecting voltages at two ends of the load;
a first input end of the data analysis module is connected with an output end of the first sampling unit, a second input end of the data analysis module is connected with an output end of the second sampling unit, and a third input end of the data analysis module is connected with an output end of the third sampling unit;
optionally, the monitoring device further comprises a display module; the input end of the display module is connected with the data output end of the data analysis module;
optionally, the control module includes a control chip; the first output end of the control chip is connected with the first control end of the electric energy conversion module, and the second output end of the control chip is connected with the second control end of the electric energy conversion module.
In a second aspect, the present application provides a battery state of health monitoring circuit, which includes a power supply and the monitoring device of any one of the first aspect; the first end of the power supply is connected with the first end of the battery module, and the second end of the power supply is connected with the second end of the battery module.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
this battery health status monitoring devices that this application embodiment provided includes: the device comprises a battery module, an electric energy conversion module, a control module and a load; the first end of the battery module is connected with the input end of the electric energy conversion module; the second end of the battery module is connected with the first end of the load; the output end of the electric energy conversion module is connected with the second end of the load; the output end of the control module is connected with the control end of the electric energy conversion module; the control module is used for outputting a switching signal to the electric energy conversion module so as to adjust the duty ratio output by the electric energy conversion module. The device sets up the electric energy conversion module in battery module's operating circuit, is convenient for monitor battery module's battery health under the operating condition, and the convenient health of in time mastering battery module.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a DC load method;
FIG. 2 is a schematic flow chart of the DC load method;
FIG. 3 is a schematic circuit diagram of an AC loading method;
FIG. 4 is a schematic flow chart of an AC loading method;
fig. 5 is a schematic structural diagram of a battery state of health monitoring apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a battery state of health monitoring apparatus according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a battery state of health monitoring apparatus according to another embodiment of the present application;
fig. 8 is a schematic structural diagram of a battery state of health monitoring circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When the state of health of the battery is measured, the state of health of the battery can be analyzed according to the impedance through the impedance in the measuring circuit. The existing impedance measurement methods are mainly divided into two major categories, namely, a direct current load method and an alternating current signal injection method. The dc load method is shown in fig. 1 and fig. 2, and only the dc impedance of the battery can be obtained according to the dc load current value measured by accessing different loads and the terminal voltage of the battery. The ac signal injection method, as shown in fig. 3 and 4, externally injects a small ac sinusoidal current or ac sinusoidal voltage signal to excite the battery, and then measures the ac voltage or current to which the battery responds to determine the ac impedance of the battery, which is complicated and expensive compared to the dc load method because of the need for auxiliary equipment or circuitry to generate the required ac excitation signal and measure the response signal.
A first embodiment of the present application provides a battery state of health monitoring device, as shown in fig. 5, the monitoring device includes: the battery module 501, the electric energy conversion module 502, the control module 503 and the load 504 are connected as follows:
the first end of the battery module 501 is connected with the input end of the electric energy conversion module 502; the second end of the battery module 501 is connected to the first end of the load 504; the output end of the power conversion module 502 is connected with the second end of the load 504; the output end of the control module 503 is connected to the control end of the electric energy conversion module 502; the control module 503 is configured to output a switching signal to the power conversion module 502 to adjust a duty ratio output by the power conversion module 502.
In this embodiment, set up the electric energy conversion module in battery module's operating circuit, be convenient for monitor battery module's battery health under the operating condition, conveniently in time master battery module's health. According to the method and the device, the duty ratio value of the electric energy conversion module can be adjusted through the control module, the generated duty ratio disturbance can enable the battery voltage and the battery current to be in sinusoidal change around the corresponding steady-state direct current value under the given frequency, then the sinusoidal fluctuation of the battery voltage and the battery current can be measured, the alternating current impedance of the battery under the disturbance frequency is determined, and the health state of the battery is further analyzed according to the impedance data.
In one embodiment, the power conversion module 502 includes a DC-DC converter, and the connection relationship is as follows:
the first end of the DC-DC converter is connected with the first end of the battery module, the second end of the DC-DC converter is connected with the second end of the battery module and the first end of the load, the third end of the DC-DC converter is connected with the second end of the load, the first control end of the DC-DC converter is connected with the first output end of the control module, and the second control end of the DC-DC converter is connected with the second output end of the control module.
In the embodiment, the controllable DC-DC converter is added in the battery circuit to adjust the duty ratio value to generate disturbance, so that a signal generating circuit or device required by the traditional impedance measuring method is eliminated, the cost is reduced, and the circuit design complexity and the size of the whole monitoring system are reduced. The method can be continuously or periodically carried out on line during monitoring, the normal operation of a battery system or a DC-DC converter is not required to be interrupted, the complete measurement process only needs a few setting cycles, the time is very short, and the method is usually microsecond or millisecond-level, so that the method is very suitable for monitoring the battery impedance in real time. In addition, the SOC and the SOH of the battery can be estimated on line based on the impedance information of the battery, and the state of health of the battery can be estimated.
It should be noted that SOC (state of charge) refers to a state of charge, also called a remaining capacity, and generally represents a charging ratio of a lithium battery, and represents a ratio of a remaining capacity of the battery after being used for a period of time or left unused for a long time to a capacity of a fully charged state thereof, and is expressed by a percentage, and the value of the percentage is in a range of 0 to 1, and when SOC is 0, the percentage indicates that the battery is completely discharged, and when SOC is 1, the percentage indicates that the battery is completely charged. Soh (state of health), which refers to the health of the battery, mainly describes the aging degree of the battery, and can be understood as the percentage of the current capacity of the battery to the factory capacity.
In one embodiment, as shown in fig. 6, the DC-DC converter includes: the first inductor L1, the first power tube, the second power tube and the first capacitor C1 are connected as follows:
a first end of the first inductor L1 is connected with a first end of the battery module, and a second end of the first inductor L1 is connected with a first end of the first power tube and a first end of the second power tube; the second end of the first power tube is connected with the first end of the first capacitor C1, the first end of the load and the second end of the battery module; the third end of the first power tube is connected with the first output end of the control module; the second end of the second power tube is connected with the second end of the first capacitor C1 and the second end of the load; and the third end of the second power tube is connected with the second output end of the control module.
The first inductor L1, the first capacitor C1 and the two power tubes form a traditional DC-DC converter, a control module is added on the basis of the traditional DC-DC converter, the power tubes are controlled to achieve interference on a circuit, so that the original circuit generates sine wave disturbance, voltages at two ends of a battery, voltages at two ends of a load and currents at the inductor can be sampled through a sampling module, currents and voltages output by the battery and voltages at two sides of the load can be measured through a current meter and a voltage meter, an impedance value of the battery is calculated according to automatically sampled data or measured data, and further the health state of the battery is obtained according to the impedance value.
In the DC-DC converter, the first power Transistor and the second power Transistor may be any one of power transistors, for example, a triode, a field effect Transistor (MOSFET, abbreviated as MOS Transistor), an Insulated Gate Bipolar Transistor (IGBT), or the like, and hereinafter, the power Transistor is exemplified as the MOS Transistor, and of course, the first MOS Transistor and the second MOS Transistor may be both PMOS transistors or both NMOS transistors, which is not limited, and here, the PMOS Transistor is exemplified.
In one embodiment, as shown in fig. 6, the first power transistor is PMOS1, the second power transistor is PMOS2, and the battery module includes a lithium battery (denoted by DC in fig. 6), and the connection relationship is as follows:
the drain of the PMOS1 is connected with the second end of the first inductor L1 and the drain of the PMOS 2; the source of the PMOS1 is connected with the first end of the first capacitor C1, the first end of the load 504 and the negative electrode of the lithium battery; the gate of the PMOS1 is connected to the first output terminal of the control module 503; the source of the PMOS2 is connected to the second terminal of the first capacitor C1 and the second terminal of the load 504; the gate of the PMOS2 is connected to the second output terminal of the control module 503, and the anode of the lithium battery is connected to the first terminal of the first inductor L1.
In this embodiment, the control module is connected to the gates of the PMOS1 and the PMOS2, and controls the on and off of the PMOS1 and the PMOS2, so as to control the duty ratio output by the DC-DC converter, and further calculate the impedance. The device sets up the electric energy conversion module in battery module's operating circuit, is convenient for monitor battery module's battery health under the operating condition, and the convenient health of in time mastering battery module.
The process of calculating the impedance may be as follows:
given a dc duty cycle value Ddc of the power converter, which provides an output voltage Vo _ dc in steady state operation, the dc voltage of the battery and the dc current of the battery are Vbattery _ dc and Ibattery _ dc, respectively. Upon triggering the impedance measurement mode, a small duty cycle sinusoidal perturbation signal Dac is added to Ddc whose peak Dac satisfies the following equation at the perturbation frequency fp:
d(t)＝Ddc+Dac×sin(2π×fp×t)。
this small duty cycle disturbance will result in a relatively small sinusoidal ripple superimposed on the dc output voltage Vo _ dc of the power converter, the dc voltage of battery Vbattery _ dc, and the dc current of battery Ibattery _ dc as follows:
Ibattery(t)＝Ibattery_dc+Iac×sin(2π×fp×t+φi)；
Vbattery(t)＝Vbattery_dc+Vac×sin(2π×fp×t+φv)。
by measuring the peak-to-peak (maximum and minimum) values of the battery voltage Vbattery _ pp and the battery current ibaattery _ pp during a perturbation period, the magnitude of the ac impedance of the battery at fp can be determined from zbatt (fp) ═ Vbattery _ pp/ibaattery _ pp. If there is a phase shift between the battery voltage and the battery current or phase information is required, the phase at fp can be determined by zbattery (fp) ═ v-phi i. After the impedance is calculated, the state of health of the battery can be estimated from the impedance.
In one embodiment, as shown in fig. 7, the monitoring device includes a battery module (which may be a lithium battery 701), a power conversion module (which may be a DC-DC converter 702), a control module 703 and a load 704, and further includes a sampling module 705, a data analysis module 706 and a display module 707; the sampling module 705 includes a first sampling unit, a second sampling unit, and a third sampling unit. The first sampling unit is used for collecting voltages at two ends of the battery module; the second sampling unit is used for collecting the current of the electric energy conversion module; the third sampling unit is used to collect the voltage across the load 704.
The connection relationship is as follows: a first input end of the data analysis module 706 is connected to an output end of the first sampling unit, a second input end of the data analysis module 706 is connected to an output end of the second sampling unit, a third input end of the data analysis module 706 is connected to an output end of the third sampling unit, and an input end of the display module 707 is connected to a data output end of the data analysis module 706.
In this embodiment, the data analysis module 706 may calculate impedance according to the sampled data, automatically analyze the health status of the battery according to the impedance, and display the health status through the display module 707, so that the user can visually know the health status of the battery conveniently.
It should be noted that the control module may be a control chip, a first output end of the control chip is connected to a first control end of the electric energy conversion module, a second output end of the control chip is connected to a second control end of the electric energy conversion module, and the control module may also be any device having an output control function, such as a micro control unit, without limitation.
Based on the same technical concept, a second embodiment of the present application provides a battery state of health monitoring circuit, as shown in fig. 8, where the monitoring circuit includes a power supply and the monitoring device of any one of the first embodiments; the first end of the power supply is connected with the first end of the battery module, and the second end of the power supply is connected with the second end of the battery module.
The circuit comprises a power supply, and can monitor the health state of the battery module in the charging and discharging process of the battery module, so that the health state can be conveniently and timely obtained.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In the description, suffixes such as "module", "part", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
The above description is merely illustrative of the invention and is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A battery state of health monitoring device, the monitoring device comprising: the system comprises a battery module, an electric energy conversion module, a control module and a load;
the first end of the battery module is connected with the input end of the electric energy conversion module; the second end of the battery module is connected with the first end of the load;
the output end of the electric energy conversion module is connected with the second end of the load;
the output end of the control module is connected with the control end of the electric energy conversion module; the control module is used for outputting a switching signal to the electric energy conversion module so as to adjust the duty ratio output by the electric energy conversion module.
2. The monitoring device of claim 1, wherein the power conversion module includes a DC-DC converter;
the first end of the DC-DC converter is connected with the first end of the battery module, the second end of the DC-DC converter is connected with the second end of the battery module and the first end of the load, the third end of the DC-DC converter is connected with the second end of the load, the first control end of the DC-DC converter is connected with the first output end of the control module, and the second control end of the DC-DC converter is connected with the second output end of the control module.
3. The monitoring device of claim 2, wherein the DC-DC converter comprises: the power supply comprises a first inductor, a first power tube, a second power tube and a first capacitor;
the first end of the first inductor is connected with the first end of the battery module, and the second end of the first inductor is connected with the first end of the first power tube and the first end of the second power tube;
the second end of the first power tube is connected with the first end of the first capacitor, the first end of the load and the second end of the battery module; the third end of the first power tube is connected with the first output end of the control module;
the second end of the second power tube is connected with the second end of the first capacitor and the second end of the load; and the third end of the second power tube is connected with the second output end of the control module.
4. The monitoring device of claim 3, wherein the battery module comprises a lithium battery; the positive electrode of the lithium battery is connected with the first end of the first inductor; and the negative electrode of the lithium battery is connected with the second end of the first power tube, the first end of the first capacitor and the first end of the load.
5. The monitoring device according to claim 4, wherein the first power transistor is a first MOS transistor, and the second power transistor is a second MOS transistor;
the drain electrode of the first MOS tube is connected with the second end of the first inductor and the drain electrode of the second MOS tube; the source electrode of the first MOS tube is connected with the first end of the first capacitor, the first end of the load and the negative electrode of the lithium battery; the grid electrode of the first MOS tube is connected with the first output end of the control module;
the source electrode of the second MOS tube is connected with the second end of the first capacitor and the second end of the load; and the grid electrode of the second MOS tube is connected with the second output end of the control module.
6. The monitoring device of claim 5, wherein the first MOS transistor and the second MOS transistor are both PMOS transistors.
7. The monitoring device of claim 1, further comprising a sampling module and a data analysis module;
the sampling module comprises a first sampling unit, a second sampling unit and a third sampling unit;
the first sampling unit is used for collecting voltages at two ends of the battery module; the second sampling unit is used for collecting the current of the electric energy conversion module; the third sampling unit is used for collecting voltages at two ends of the load;
the first input end of the data analysis module is connected with the output end of the first sampling unit, the second input end of the data analysis module is connected with the output end of the second sampling unit, and the third input end of the data analysis module is connected with the output end of the third sampling unit.
8. The monitoring device of claim 7, further comprising a display module; the input end of the display module is connected with the data output end of the data analysis module.
9. The monitoring device of any one of claims 2-8, wherein the control module includes a control chip; the first output end of the control chip is connected with the first control end of the electric energy conversion module, and the second output end of the control chip is connected with the second control end of the electric energy conversion module.
10. A battery state of health monitoring circuit, wherein the monitoring circuit comprises a power source and the monitoring device of any one of claims 1-9; the first end of the power supply is connected with the first end of the battery module, and the second end of the power supply is connected with the second end of the battery module.
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