CN219015556U - Battery system and electric automobile - Google Patents
Battery system and electric automobile Download PDFInfo
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- CN219015556U CN219015556U CN202223154200.1U CN202223154200U CN219015556U CN 219015556 U CN219015556 U CN 219015556U CN 202223154200 U CN202223154200 U CN 202223154200U CN 219015556 U CN219015556 U CN 219015556U
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Abstract
The embodiment of the disclosure relates to a battery system and an electric automobile. The battery system is applied to an electric automobile, a target battery of the battery system and a detection circuit arranged around the target battery, wherein the detection circuit comprises a power supply module, a capacitor, a first resistor and a detection chip; the power module, the capacitor and the first resistor are sequentially connected to form a current path, and the detection chip is connected with the first resistor to detect voltages at two ends of the first resistor; the capacitance of the capacitor is related to whether battery electrolyte is present between the metal conductors of the capacitor. When the target battery leaks, the detection chip can accurately detect whether the target battery leaks through the change condition of the voltages at the two ends of the first resistor, so that the leakage detection precision of the target battery is improved.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of electric automobiles, in particular to a battery system and an electric automobile.
Background
The application of new energy electric automobile in life is more and more popular, and battery electrolyte is full of in the battery that new energy electric automobile used, and when receiving external force collision, the battery electrolyte in the battery has the risk of weeping. Therefore, detecting the state of leakage of the battery of the new energy electric automobile is important in ensuring safe operation of the new energy electric automobile.
In the conventional technology, a capacitor consisting of two metal wires or metal sheets is arranged in a battery pack, and the leakage state of a battery is detected by utilizing the change of resistance values between the two metal wires or metal sheets.
However, in the conventional technology, there is a problem in that the accuracy of detecting the leak state of the battery is low.
Disclosure of Invention
The embodiment of the disclosure provides a battery system and an electric automobile, which can be used for improving the detection precision of a battery leakage state of the electric automobile.
In a first aspect, an embodiment of the present disclosure provides a battery system, including a target battery and a detection circuit disposed around the target battery, the detection circuit including a power module, a capacitor, a first resistor, and a detection chip; the power module, the capacitor and the first resistor are sequentially connected to form a current path, and the detection chip is connected with the first resistor to detect voltages at two ends of the first resistor; the capacitance of the capacitor is related to whether battery electrolyte is present between the metal conductors of the capacitor.
In a second aspect, embodiments of the present disclosure provide an electric vehicle including a battery system as in the first aspect.
The battery system and the electric automobile provided by the embodiment of the disclosure comprise a target battery and a detection circuit arranged around the target battery, wherein the detection circuit comprises a power supply module, a capacitor, a first resistor and a detection chip; the detection chip is connected with the first resistor to detect the voltage at two ends of the first resistor, when the electric automobile is impacted by external force, if the target battery in the battery system is leaked, the leaked electrolyte in the target battery can flow to the metal conductors of the capacitor, the dielectric constants of different liquids are not changed greatly due to the fact that the difference value of the dielectric constants of different liquids is smaller, the dielectric constant of the liquid is far larger than that of air, the capacitance of the capacitor is related to whether battery electrolyte exists between the metal conductors of the capacitor, and therefore when the leaked electrolyte of the target battery exists between the metal conductors of the capacitor, the capacitance of the capacitor can be rapidly increased, the current flowing through the capacitor under the action of the voltage provided by the power module is rapidly increased, so that the voltage at two ends of the first resistor is rapidly increased, and therefore, when the target battery is leaked, the detection chip can accurately detect whether the target battery is leaked through the condition of the change of the voltage at two ends of the first resistor, and the detection precision of the leakage of the target battery is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional battery leakage detection device;
FIG. 2 is a schematic diagram of a battery system in one embodiment;
FIG. 3 is a schematic diagram of a capacitor in one embodiment;
FIG. 4 is a schematic diagram of a capacitor in another embodiment;
fig. 5 is a schematic view showing the structure of a battery system according to another embodiment;
fig. 6 is a schematic view of a battery system according to another embodiment;
FIG. 7 is a schematic diagram of an electric vehicle in one embodiment;
reference numerals illustrate:
a battery system: 01; target battery: 10;
the detection circuit: 20, a step of; and a power supply module: 201;
capacitance: 202; first resistance: 203, a base station;
and (3) a detection chip: 204; an analog-to-digital converter: 205.
Second resistor: 206; electric automobile: 02.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosed embodiments and are not intended to limit the disclosed embodiments.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar terms herein do not denote a limitation of quantity, but rather denote the singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The term "plurality" as used herein means greater than or equal to two. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The terms "first," "second," and the like, as used herein, merely distinguish similar objects and do not represent a particular ordering of objects.
First, before the technical solution of the embodiments of the present disclosure is specifically described, a description is given of a technical background or a technical evolution context on which the embodiments of the present disclosure are based. Under the normal condition, in electric automobile trip field, current technical background is: when the electric automobile is impacted by external force, electrolyte in the battery is at risk of leakage. Therefore, detecting the state of leakage of the battery of the new energy electric automobile is important in ensuring safe operation of the new energy electric automobile. However, in the conventional technology, as shown in fig. 1, a sensor composed of two metal wires or metal sheets and a resistance detection module are mainly provided in a battery pack, and when no liquid enters between the metal sheets, the resistance detection module can detect that the resistance between the two metals is very large R1; on the contrary, when liquid enters between the metal plates, the resistance detection module can detect that the resistance between two metals is rapidly reduced to R2, and the state of the entering liquid can be estimated through the change of the resistance value, however, due to the fact that the electrolyte components of different batteries are different, the change of the conductive resistance of different liquids is very large, the range of the resistance value change value of the sensor is very large, the detection precision of battery leakage is affected, false alarm is caused, and the detection precision of the battery leakage state is lower. In addition, it should be noted that, from the determination of the conventional technical solution that the detection accuracy is low and the technical solution described in the following embodiments, the applicant has made a great deal of creative effort.
In a first aspect, as shown in fig. 2, there is provided a battery system 01, the battery system 01 including a target battery 10 and a detection circuit 20 disposed around the target battery 10, the detection circuit 20 including a power supply module 201, a capacitor 202, a first resistor 203, and a detection chip 204; the power module 201, the capacitor 202 and the first resistor 203 are sequentially connected to form a current path, and the detection chip 204 is connected to the first resistor 203 to detect voltages at two ends of the first resistor 203; the capacitance of the capacitor 202 is related to whether battery electrolyte is present between the metal conductors of the capacitor 202.
It should be noted that, the battery system 01 of the present embodiment may be applied to an electric vehicle, the target battery 10 of the present embodiment may be a battery of the electric vehicle, alternatively, the target battery 10 of the present embodiment may be a lithium ion battery, further, based on the above embodiment, the target battery 10 is a lithium ion battery, and the lithium ion battery is a rechargeable battery that mainly relies on lithium ions to move between a positive electrode and a negative electrode to operate. The lithium ion batteries currently applied to electric automobiles mainly comprise lithium manganate, lithium titanate, lithium iron phosphate, ternary materials and other types of lithium ion batteries. It can be understood that the lithium ion battery has the advantages of high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, quick charge, large working temperature range and the like, and can better provide power for the electric automobile.
In this embodiment, the detection circuit 20 disposed around the target battery 10 includes a power module 201, a capacitor 202, a first resistor 203, and a detection chip 204, where the power module 201 may provide power to the detection circuit 20, and the detection chip 204 may be used to detect a voltage across the first resistor 203. In addition, in the present embodiment, the impedance of the capacitor 202 may be expressed as
Wherein Z is c Representing the impedance of the capacitor 202, f representing the frequency of the power supply module 201, C representing the capacitance of the capacitor 202, it can be seen that the impedance of the capacitor 202 is inversely proportional to the capacitance of the capacitor 202, and the voltage across the first resistor 203 is inversely proportional to the impedance of the capacitor 202, i.e. the voltage across the first resistor 203 is proportional to the capacitance of the capacitor 202, and thus it can be seen that the voltage across the first resistor 203 is related to the capacitance of the capacitor 202. In addition, the capacitance of the capacitor 202 is proportional to the area and the pitch of the metal conductor of the capacitor 202, the dielectric constant of the dielectric, and the like, and the dielectric constant of different liquids is not greatly changed, and the dielectric constant of the liquid is far greater than the dielectric constant of the gas, so that when the target battery 10 has a leakage phenomenon, the dielectric constant of the dielectric of the capacitor 202 is increased, the capacitance of the capacitor 202 is increased, and the voltage across the first resistor 203 is increased. Alternatively, in this embodiment, the metal conductor of the capacitor 202 may be copper or aluminum. Alternatively, the initial capacitance of the capacitor 202 may be 10nF, and the embodiment herein does not limit the initial capacitance of the capacitor 202, and the capacitance of the capacitor 202 may be increased to 15-25 nF when the battery leaks. Illustratively, as shown in FIG. 3, in this embodiment, the capacitor 202 is formed between two metal conductorsThe distance d1 can be 10 mm-14 mm, the length d2 of each metal conductor can be 0.3 mm-0.6 mm, and the width d3 can be 0.2 mm-0.4 mm.
Alternatively, in the present embodiment, as shown in fig. 2, in the above current path, one end of the first resistor 203 is connected to the capacitor 202, and the other end of the first resistor 203 is grounded, so that a voltage can be generated across the first resistor 203 by the current flowing through the capacitor 202. It should be noted that, the resistance of the first resistor 203 depends on the voltage range that the detection circuit 20 can detect, and thus, the resistance of the first resistor 203 can be adjusted according to the voltage range that the detection circuit 20 can detect. Alternatively, in the present embodiment, the resistance of the first resistor 203 may range from 1kΩ to 2kΩ.
In general, when an electric automobile is impacted by the outside, a leakage of the target battery 10 will occur, in this embodiment, when the target battery 10 leaks, the leaked electrolyte in the target battery 10 will flow between the metal conductors of the capacitor 202 in the detection circuit 20, since the dielectric constants of different liquids do not change much more, and the dielectric constant of the liquid is much greater than that of air, when the leaked electrolyte flows between the metal conductors of the capacitor 202, the capacitance of the capacitor 202 will increase rapidly, the current flowing through the capacitor 202 will increase rapidly under the action of the voltage provided by the power module 201, and then the voltage values at the two ends of the first resistor 203 will increase rapidly, so that the voltage values at the two ends of the first resistor 203 can be measured by the detection chip 204, and whether the leakage of the target battery 10 occurs can be detected according to the change of the voltage values at the two ends of the first resistor 203.
Alternatively, in this embodiment, the detection chip 204 may have a digital-to-analog conversion function, and may convert an analog signal in the detection circuit 20 into a digital signal, and detect whether the leakage occurs in the target battery 10 according to the digital signal.
According to the battery system 01, when the electric automobile is impacted by external force, if the target battery in the battery system 01 leaks, the leaked electrolyte in the target battery flows between the metal conductors of the capacitor, the dielectric constants of different liquids are not changed greatly due to the fact that the difference value of the dielectric constants between the different liquids is smaller, the dielectric constants of the liquids are far larger than the dielectric constant of air, and whether battery electrolyte is relevant between the capacitance value of the capacitor and the metal conductors of the capacitor exists or not, so that when the leaked electrolyte of the target battery exists between the metal conductors of the capacitor, the capacitance value of the capacitor can be rapidly increased, the current flowing through the capacitor under the action of the voltage provided by the power supply module is rapidly increased, and therefore the voltage at two ends of the first resistor is rapidly increased.
Further, in order to enable the detection circuit 20 to accurately detect a minute amount of leakage occurring in the target battery 10. Based on the above embodiments, in one embodiment, as shown in fig. 4, a foaming material is disposed between the metal conductors of the capacitor 202.
The foaming material is a substance capable of generating bubbles by vaporization in the substance to form a foam of a porous substance, and the foaming material is capable of absorbing a liquid by utilizing a capillary phenomenon, that is, a phenomenon in which when an object containing fine pores is brought into contact with the liquid, the liquid can be raised or lowered along the pores.
In this embodiment, a foaming material is disposed between metal conductors of the capacitor 202, when the detection circuit 20 is in a leakage-free environment, the foaming material inside the capacitor 202 in the detection circuit 20 is unchanged, the capacitance value of the capacitor 202 is an initial value capacitance value, the current flowing through the capacitor 202 under the power module 201 is a stable value, and the voltage at two ends of the first resistor 203 is an initial value voltage; when the detection circuit 20 is in the leakage environment, even if a trace leakage condition occurs, the electrolyte leaked from the target battery 10 can be immersed into the middle of the capacitor 202 from the capillary channel of the foaming material, and the capacitance of the capacitor 202 is increased due to the fact that the dielectric constant of the liquid is far greater than that of the gas, the current flowing through the capacitor 202 under the power module 201 is increased, and therefore the voltage across the first resistor 203 is increased.
In this embodiment, a foaming material is disposed between the metal conductors of the capacitor 202, when the target battery leaks, the foaming material absorbs liquid by utilizing capillary phenomenon, and when the target battery leaks a small amount or a trace of electrolyte, the foaming material can quickly absorb the leaked electrolyte, so that the property of the dielectric between the metal conductors of the capacitor 202 is changed, and the dielectric constant of the dielectric between the metal conductors is changed, so that the trace amount of electrolyte leaked by the target battery can be detected, and the detection precision of the leakage state of the target battery is improved.
Further, in some scenarios, the detection chip 204 may directly process the converted digital signal, and detect whether the target battery 10 is leaking. On the basis of the above embodiment, as shown in fig. 5, the detection circuit 20 further includes an analog-to-digital converter 205, and the detection chip 204 is connected to the first resistor 203 through the analog-to-digital converter 205.
The analog-to-digital converter 205 refers to an electronic element that converts an analog signal into a digital signal. In this embodiment, the analog-to-digital converter 205 may convert the analog signal of the voltage across the first resistor 203 into a digital signal, so that the detection chip 204 performs analysis processing on the converted digital signal, thereby detecting whether the leakage occurs in the target battery 10. Alternatively, in this embodiment, after the analog-to-digital converter 205 converts the analog signal of the voltage across the first resistor 203 into the digital signal, the detection chip 204 may detect whether the target battery 10 is leaking according to the converted digital signal and the preset voltage threshold, for example, when the detection chip 204 determines that the converted digital signal is greater than the preset voltage threshold, it may determine that the target battery 10 is leaking.
In this embodiment, the detection circuit further includes an analog-to-digital converter, and the detection chip is connected with the first resistor through the analog-to-digital converter, so that the analog-to-digital converter can convert the analog signals of the voltages at two ends of the first resistor into digital signals and send the digital signals to the detection chip, so that the detection signals detect whether the target battery leaks according to the converted digital signals.
In some scenarios, in order to avoid damage to the detection chip 204 caused by excessive current flowing into the detection chip 204, the detection circuit 20 further includes, as shown in fig. 6, on the basis that the detection circuit 20 further includes an analog-to-digital converter 205: a second resistor 206; the detection chip 204 is connected to the first resistor 203 through an analog-to-digital converter 205 and a second resistor 206.
In this embodiment, the second resistor 206 is a protection resistor for buffering the current flowing into the detection chip 204 to protect the detection chip 204. In general, the second resistor 206 has a function of common resistor under normal conditions, and when the power value flowing through the second resistor 206 exceeds the rated power of the first resistor 203 when the circuit fails, for example, the first resistor 203 breaks down, the second resistor 206 breaks down the circuit within a preset period of time, so as to achieve the protection and detection effects.
In this embodiment, the second resistor in the detection circuit is a protection resistor, and the detection chip is connected with the first resistor through the analog-to-digital converter and the second resistor in sequence, and when the detection circuit works normally, the second resistor has a general function of the resistor; when faults such as the first resistor is broken in the detection circuit, the second resistor can be disconnected in a preset time period, and the current flowing into the detection chip is buffered, so that the detection chip is protected, and damage to the detection chip due to overlarge current is avoided.
In the above embodiment, the power module 201 is required to provide power to the detection circuit 20, and two alternative schemes are provided in this embodiment to provide ac power to the detection circuit 20. In one embodiment, the power module 201 is an ac power source; alternatively, the power supply module 201 includes an inverter circuit connected to the target battery 10.
In this embodiment, in order to make the capacitor 202 work normally, the current in the detection circuit 20 is ac, and after the ac is connected to the two ends of the capacitor 202, the capacitor 202 is repeatedly charged and discharged, so as to continuously exchange energy with the power module 201.
In this embodiment, the power module 201 may be an ac power source, and alternatively, the power module 201 may be a power source independently provided in the detection circuit 20 to supply power to the detection circuit 20. Alternatively, in this embodiment, the power module 201 may also be an inverter circuit, which is connected to the target battery 10 and converts the dc power provided by the target battery 10 into ac power to supply the detection circuit 20 with power.
It can be understood that, when the power module 201 is a power source independently provided in the detection circuit 20, the power module 201 supplies power to the detection circuit 20 independently, and is relatively independent, and when the target battery 10 fails, the detection circuit 20 can work normally to detect the leakage condition of the target battery 10 in real time; when the power module 201 includes the inverter circuit, the target battery 10 can be directly multiplexed to supply power to the detection circuit 20, so that no additional power supply is needed, the manufacturing cost of the battery system 01 can be reduced, and the volume of the battery system 01 can be reduced.
Alternatively, in this embodiment, to meet the minimum current power required by the detection circuit 20, and ensure the normal operation of the detection circuit 20, the frequency of the ac power provided by the power module 201 may be greater than 1KHz.
In this embodiment, the detection circuit is powered by the power module, so that the detection circuit can work normally through the capacitor 202 for the current provided by the power module, and the power module can be an independently set ac power supply, or the power module can include an inverter circuit, and the inverter circuit converts the dc power provided by the target battery to power the detection circuit, so that the detection circuit can work normally, and detect the leakage condition of the target battery in real time.
In a second aspect, in one embodiment, as shown in fig. 7, there is provided an electric vehicle 02 including the battery system 01 as described in the first aspect above.
Alternatively, the electric vehicle 02 in the present embodiment may be any one of a passenger car, a truck, a van, a commercial vehicle, a semitrailer, and the like. Alternatively, the electric vehicle in this embodiment may be a pure oil electric vehicle, or may be an electric vehicle with hybrid oil and electricity. The present embodiment does not limit the type of the electric vehicle 02 here. In addition, the structure and the working principle of the control circuit included in the electric vehicle 02 provided in the present embodiment are referred to the detailed description of the control circuit in the above embodiment, and the present embodiment is not repeated herein.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few implementations of the disclosed examples, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made to the disclosed embodiments without departing from the spirit of the disclosed embodiments. Accordingly, the protection scope of the disclosed embodiment patent should be subject to the appended claims.
Claims (10)
1. The battery system is characterized by comprising a target battery and a detection circuit arranged around the target battery, wherein the detection circuit comprises a power supply module, a capacitor, a first resistor and a detection chip; the power module, the capacitor and the first resistor are sequentially connected to form a current path, and the detection chip is connected with the first resistor to detect voltages at two ends of the first resistor; the capacitance of the capacitor is related to whether battery electrolyte is present between the metal conductors of the capacitor.
2. The battery system of claim 1, wherein a foam material is disposed between the metallic conductors of the capacitor.
3. The battery system according to claim 1 or 2, wherein the detection circuit further includes an analog-to-digital converter, and the detection chip is connected to the first resistor through the analog-to-digital converter.
4. The battery system of claim 3, wherein the detection circuit further comprises: a second resistor; the detection chip is connected with the first resistor through the analog-to-digital converter and the second resistor in sequence.
5. The battery system according to claim 1, wherein one end of the first resistor is connected to the capacitor in the current path, and the other end of the first resistor is grounded.
6. The battery system of claim 1, wherein the power module is an ac power source; alternatively, the power module includes an inverter circuit connected with the target battery.
7. The battery system of claim 6, wherein the ac power source has a frequency greater than 1KHz.
8. The battery system according to claim 1, wherein the first resistor has a resistance value ranging from 1kΩ to 2kΩ.
9. The battery system of claim 1, wherein the target battery is a lithium ion battery.
10. An electric vehicle, characterized in that it comprises a battery system according to any one of claims 1-9.
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| CN202223154200.1U CN219015556U (en) | 2022-11-25 | 2022-11-25 | Battery system and electric automobile |
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| CN202223154200.1U CN219015556U (en) | 2022-11-25 | 2022-11-25 | Battery system and electric automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117346962A (en) * | 2023-12-05 | 2024-01-05 | 杭州华塑科技股份有限公司 | Battery leakage detection method and device, electronic equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117346962A (en) * | 2023-12-05 | 2024-01-05 | 杭州华塑科技股份有限公司 | Battery leakage detection method and device, electronic equipment and storage medium |
| CN117346962B (en) * | 2023-12-05 | 2024-03-12 | 杭州华塑科技股份有限公司 | Battery leakage detection method and device, electronic equipment and storage medium |
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