CN112816894A - Lithium battery short circuit detection device and method and lithium battery power supply control system - Google Patents
Lithium battery short circuit detection device and method and lithium battery power supply control system Download PDFInfo
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- CN112816894A CN112816894A CN202011599306.5A CN202011599306A CN112816894A CN 112816894 A CN112816894 A CN 112816894A CN 202011599306 A CN202011599306 A CN 202011599306A CN 112816894 A CN112816894 A CN 112816894A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention discloses a lithium battery short circuit detection device and method and a lithium battery power supply control system, wherein the lithium battery short circuit detection device comprises: a detection circuit, comprising: the power resistor, the switch module and the current acquisition module are sequentially connected in series and are connected with the load in series, and the power resistor is used for limiting the current flowing through the lithium battery short circuit detection device; the switch module is used for controlling the on-off operation of the detection circuit; the current acquisition module is used for acquiring the current of the lithium battery power supply loop; and the control circuit is connected with the control end of the switch module and the current acquisition module respectively and is used for controlling the switch module to be closed, judging whether the current time passing through the detection circuit exceeds the preset time or not, and determining the short circuit of the lithium battery power supply loop when the current time exceeds the preset time. By implementing the invention, the short circuit detection of the lithium battery power supply loop can be realized with low cost and high reliability.
Description
Technical Field
The invention relates to the field of lithium battery short circuit detection and protection, in particular to a lithium battery short circuit detection device and method and a lithium battery power supply control system.
Background
With the rapid development of portable electric tools driven by batteries, the requirements for charging and discharging and short-circuit protection of driving batteries are also higher and higher. The power lithium battery has strong discharging capacity, the instantaneous short circuit output current can reach nearly kilo amperes, and when the battery system has instantaneous short circuit, the damage to the whole system is very large.
At present, schemes for detecting external short circuits of each battery system in the industry are realized based on complex hardware schemes, and the schemes have the disadvantages of high cost, high error rate and low reliability. Therefore, whether the battery system is short-circuited or not can not be accurately detected, and further, countermeasures can not be taken timely, so that the battery system cannot be protected.
Therefore, how to accurately detect the short circuit outside the lithium battery with high reliability is a problem to be solved urgently.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that a protection circuit cannot be accurately and timely implemented, so as to provide a lithium battery short circuit detection apparatus and method and a lithium battery power supply control system.
According to a first aspect, an embodiment of the present invention provides a lithium battery short-circuit detection apparatus, which is connected in series with a load on a lithium battery power supply circuit, and includes: a detection circuit, comprising: the power resistor, the switch module and the current acquisition module are sequentially connected in series and are connected with the load in series, and the power resistor is used for limiting the current flowing through the lithium battery short circuit detection device; the switch module is used for controlling the on-off operation of the detection circuit; the current acquisition module is used for acquiring the current of the lithium battery power supply loop; and the control circuit is connected with the control end of the switch module and the current acquisition module respectively and is used for controlling the switch module to be closed, judging whether the current time passing through the detection circuit exceeds the preset time or not, and determining the short circuit of the lithium battery power supply loop when the current time exceeds the preset time.
According to the lithium battery short circuit detection device provided by the embodiment of the invention, the short circuit detection device and the load are connected in series on the lithium battery power supply loop, whether the lithium battery is in short circuit or not can be detected before the power supply loop is switched on, and the damage of the strong current instantaneously released by the short circuit of the lithium battery to the whole circuit can be prevented in advance. The whole short circuit detection device consists of a detection circuit and a control circuit: the detection circuit is formed by sequentially connecting a power resistor, a switch module and a current acquisition module in series, the power resistor can effectively limit the current passing through the detection circuit, the short-circuit detection device can be prevented from being damaged by the current instantly sent by a short circuit, the current can be limited within the range capable of being detected by the detection circuit, and the short-circuit detection device can effectively and safely operate; the switch module can control whether the detection circuit is switched on or not, can control the on-off state of the detection circuit according to the requirement, and can avoid increasing the burden of a power supply system when the detection is not needed; the current acquisition module is used for acquiring the current of the lithium battery power supply loop; the current acquisition module of the control end of the switch module is connected with the control circuit, the control circuit can directly control the running state of the switch module, meanwhile, whether the preset time is exceeded or not is judged according to the current duration time of the detection circuit, and if the preset time is exceeded, the short circuit of the lithium battery power supply loop is determined. Through the simple connection of detection circuitry and control circuit, the short circuit that can be effective safe accomplishes lithium cell power supply circuit detects, has improved the reliability that lithium cell short circuit detected.
With reference to the first aspect, in a first implementation manner of the first aspect, the control circuit includes: the signal processing module is connected with the current acquisition module and is used for processing the acquired signals; and the controller is respectively connected with the signal processing module and the control end of the switch module and is used for controlling the switch module to be closed, judging whether the current time passing through the detection circuit exceeds the preset time or not, and determining the short circuit of the lithium battery power supply loop when the current time exceeds the preset time.
According to the lithium battery short circuit detection device provided by the embodiment of the invention, the control circuit comprises a signal processing module and a controller, the signal processing module is connected with the current acquisition module, and the current acquired by the current acquisition module is preprocessed before the controller judges the current duration time, so that the current signal can be identified by the controller, and the accuracy of judging whether a lithium battery power supply circuit is short-circuited by the controller is ensured; the controller is directly connected with the control end of the switch module, controls the on-off of the switch module, further controls the on-off of the whole detection device, simultaneously judges the current duration according to the current processed by the signal processing module, and further judges whether the lithium battery power supply loop is short-circuited or not according to the comparison of the duration and the preset time.
With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the current collection module is a shunt, and the signal processing module is connected to two ends of the shunt and is configured to detect a voltage across the shunt.
According to the lithium battery short circuit detection device provided by the embodiment of the invention, the current collection module is specifically a shunt, voltage can be generated at two ends of the shunt at the moment when the switch module is closed, the signal processing module is connected with the two ends of the shunt, so that current collection is realized, and meanwhile, because the resistance value of the shunt is very small, very high voltage cannot be generated, so that the safety and reliability of current collection can be ensured.
With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the signal processing module is an isolation operational amplifier module, and is configured to collect a voltage output by the shunt and perform amplification processing.
According to the lithium battery short circuit detection device provided by the embodiment of the invention, the isolation operational amplifier module is used as the signal processing module, and the voltage generated at the two ends of the shunt is very small, so that the current can be accurately detected, the acquired voltage is amplified by the isolation operational amplifier module, the controller can detect the acquired current, and the reliability of lithium battery short circuit detection is improved.
With reference to the first implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the switch module is an MOS transistor, and a gate of the MOS transistor is connected to the controller.
With reference to the first implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the control circuit further includes: the power supply module is used for providing electric energy; and the voltage conversion module is respectively connected with the power module and the controller and is used for reducing the voltage input by the power module and outputting the reduced voltage to the controller.
According to the lithium battery short-circuit detection device provided by the embodiment of the invention, the control circuit further comprises the power supply module, the voltage conversion module and the independent power supply module, so that the whole control circuit is ensured to be continuously powered, the whole short-circuit detection device is separated from a lithium battery power supply loop, the accuracy of lithium battery short-circuit detection can be ensured, and the reliability of lithium battery short-circuit detection is improved. Meanwhile, in order to ensure that the voltage provided by the power supply module is adaptive to the controller, the voltage conversion module is matched to step down the voltage provided by the power supply module to reach the voltage adaptive to the controller, so that the normal operation of the controller is ensured, the controller is prevented from being damaged by overhigh voltage, and the safety and the reliability of the control circuit are ensured.
According to a second aspect, an embodiment of the present invention provides a lithium battery power supply control system, including: the lithium battery, the load and the lithium battery short circuit detection device according to the first aspect or any embodiment of the first aspect are connected in series.
According to the lithium battery power supply control system provided by the embodiment of the invention, the lithium battery short circuit detection device is connected in series to the lithium battery power supply circuit, so that the short circuit detection of the whole lithium battery power supply circuit can be more directly carried out, the steps of the lithium battery short circuit detection are simplified, meanwhile, the short circuit detection of the lithium battery power supply circuit can be more accurately carried out, the lithium battery circuit can be more accurately subjected to the short circuit detection under the condition of simple technical scheme, the reliability of the short circuit detection of the lithium battery power supply circuit is improved, and the safety of the lithium battery power supply system is ensured.
With reference to the second aspect, in a first embodiment of the second aspect, the method further includes: and the power control loop is connected with the lithium battery and the load in series and is connected with the lithium battery short circuit detection device in parallel.
According to the lithium battery power supply control system provided by the embodiment of the invention, the power control loop and the lithium battery short circuit detection device are connected in parallel and are connected in series in the lithium battery power supply loop, which is equivalent to that two switches are arranged for the whole lithium battery power supply system, and the lithium battery short circuit detection device is closed before the power control loop is closed, so that the short circuit detection of the whole system under the same power supply system is ensured, the accuracy of the short circuit detection can be ensured, and the reliability of the short circuit detection is improved. Meanwhile, the direct damage to the whole system caused by directly closing the power control loop can be prevented, and the safety of the whole lithium battery power supply control system is improved.
With reference to the second aspect or the first embodiment of the second aspect, in the second embodiment of the second aspect, the lithium battery is used for a vehicle.
According to a third aspect, an embodiment of the present invention provides a detection method for a lithium battery short circuit detection apparatus described in the first aspect or any implementation manner of the first aspect, including: detecting a current and a current duration through the detection circuit; judging whether the current time passing through the detection circuit exceeds a preset time or not; and when the preset time is exceeded, determining that the lithium battery power supply loop is short-circuited.
According to the detection method of the lithium battery short circuit detection device provided by the embodiment of the invention, the current magnitude and the current duration of the detection circuit are compared with the preset time, so that the purpose of lithium battery short circuit detection is achieved. When the battery works normally, high voltage in a short time can be generated at the moment when the switch module is closed, and the current duration time is very short; when the lithium battery power supply system is in short circuit, current with longer duration can be generated, and the generated current often exceeds the current of the lithium battery power supply system in a normal working state, so that when the current duration of the detection circuit exceeds the preset time, the short circuit of the lithium battery power supply circuit is shown.
Drawings
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 that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a specific example of a lithium battery short circuit detection apparatus in embodiment 1 of the present invention;
fig. 2 is a schematic block diagram of a specific example of a lithium battery power supply control system in embodiment 2 of the present invention;
fig. 3 is a flowchart of a specific example of a lithium battery short-circuit detection method in embodiment 3 of the present invention
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a lithium battery short circuit detection device for short circuit detection of a lithium battery power supply loop. As shown in fig. 1, the lithium battery short circuit detection device is connected in series with a load on a lithium battery power supply circuit, and includes: detection circuit 10, control circuit 20.
Wherein, detection circuit 10 includes: the power resistor 11, the switch module 12 and the current acquisition module 13 are sequentially connected in series and are connected with the load in series, and the power resistor is used for limiting the current flowing through the lithium battery short circuit detection device; the switch module is used for controlling the on-off operation of the detection circuit; the current acquisition module is used for acquiring the current of the lithium battery power supply loop;
this embodiment adopts power resistor to restrict the electric current that flows through whole detection device at detection circuitry's construction in-process, owing to can produce very big electric current in the closed twinkling of an eye at switch module, uses general resistance, will be destroyed by the strong current in the twinkling of an eye very easily, takes place under the condition of short circuit simultaneously, has fixed electric current size to flow through power resistor, can enough protect detection circuitry and also can guarantee the short circuit detection of effectual completion to lithium battery power supply circuit. The switch module is used for controlling the on-off condition of the detection circuit, so that the detection circuit has controllability, when partial elements have problems, the on-off of the detection circuit can be controlled timely, the damage of the whole detection device is prevented, meanwhile, the switch module can be directly disconnected when the detection is not needed, the power supply burden of a lithium battery is reduced, and the circuit is not required to be detached. Because directly establish ties short circuit detection device in lithium cell power supply circuit, technical scheme is simple, and convenient operation is simple simultaneously, because directly establish ties detection device in power supply circuit, has reduced loaded down with trivial details matching process, can directly be suitable for. Meanwhile, the current collection module is connected in series in the detection circuit, so that the current passing through the power resistor can be collected, and when the current passes through the current collection module, voltage can be generated at two ends of the current collection module, and the purpose of collecting the current is achieved. Because the continuous current passes through power resistor during the short circuit, after the switch module is closed, the current collection module can be continuously passed through, continuous voltage is generated, and the controller in the follow-up control circuit can be judged to provide effective data. The accuracy of short circuit detection is guaranteed, and the reliability of detection is improved.
The control circuit 20 is connected to the control end of the switch module 12 and the current collection module 13, and is configured to control the switch module 12 to be closed, determine whether the current time passing through the detection circuit exceeds a preset time, and determine that the lithium battery power supply circuit is short-circuited when the current time exceeds the preset time.
The control circuit in this embodiment is connected with the switch module and the current collection module in the detection circuit respectively, controls the switch module, and processes and analyzes the current data collected by the current collection module at the same time, because a continuous current can be generated in a short-circuit state, the current duration time is longer than that in a normal working state, and therefore when the current duration time exceeds a preset time, it can be determined that the lithium battery power supply circuit is short-circuited. Certainly, the current under the short-circuit state can be greater than the current under the normal state, therefore, when the electric current that detects is greater than the current under the normal operating condition, also can be preliminary judgement lithium cell power supply circuit has taken place the short circuit condition, simultaneously when the detection to the electric current duration, the electric current size also is the size that exceeds the electric current under the normal operating condition to the duration exceeds 2s, and double comparison detects, can more accurately detect whether take place the short circuit, has improved detection device's reliability. The preset time is 2s in this embodiment, but the preset time is not specifically limited in this embodiment, and may be specifically limited according to different lithium batteries or different application scenarios.
Preferably, the control circuit includes:
the signal processing module 21 is connected with the current acquisition module 13 and is used for processing the acquired signals; and the controller 22 is connected with the signal processing module 21 and the control end of the switch module 12 respectively, and is used for controlling the switch module 12 to be closed, judging whether the current time passing through the detection circuit exceeds the preset time, and determining that the lithium battery power supply loop is short-circuited when the current time exceeds the preset time.
In the control circuit in the embodiment, the switching module is switched on and off through the set controller, and the data acquired by the current acquisition module is compared and judged, so that a result of whether short circuit occurs is obtained. Because the data that the current acquisition module gathered can not be discerned by the controller, consequently, still be provided with signal processing module between controller and current acquisition module, send data acquisition to before the controller, carry out preliminary treatment to data through signal processing module, guarantee that the controller can correctly discern, guaranteed data acquisition's validity, improved short circuit detection's reliability.
Preferably, the current collecting module 13 is a shunt, wherein the signal processing module 21 is connected to two ends of the shunt, and is configured to detect a voltage across the shunt.
Specifically, this embodiment adopts the shunt as the current acquisition module, and when closed switch module, the shunt can pass through the electric current, and its both ends can produce voltage, because the shunt is the very little resistance of a resistance, consequently can not have too much restriction to the electric current, simultaneously under the condition of knowing the resistance size of shunt, connect the voltage size that signal processing module produced at shunt both ends can be direct detection shunt both ends, thereby according to formula I U/R can directly derive the electric current size, whether the short circuit takes place for preliminary judgement. Because the current is connected with the power resistor in series and is limited through the shunt, high voltage cannot be generated, the detection safety is improved, meanwhile, the collected data is preprocessed by the signal processing module, the validity of the collected data can be ensured, the identification and judgment of a subsequent controller are guaranteed, and the reliability of short circuit detection and judgment is improved. Of course, the embodiment of the present invention does not limit the specific current collection module, and other components having the same function may also be applicable to the apparatus, and may be determined according to specific needs.
Preferably, the signal processing module 21 is an isolation operational amplifier module, and is configured to collect the voltage output by the shunt and perform amplification processing.
Specifically, as mentioned above, the voltage generated at the two ends of the current collecting module of the shunt is relatively small, and in order to prevent the controller from being unable to accurately identify, when data is input into the controller, the isolating operational amplifier module is used for preferentially amplifying, so as to ensure that the controller can effectively identify, and improve the reliability of the short circuit detection. Meanwhile, direct circuit coupling does not exist between the ground input and output of the isolation operational amplifier module and the power circuit, namely, a common grounding end does not exist in the signal transmission process, so that ground measurement errors caused by a grounding loop can be eliminated, and the circuit cost can be reduced.
Preferably, the switch module 12 is an MOS transistor, and a gate of the MOS transistor is connected to the controller.
Specifically, the switch module adopted in this embodiment is an MOS transistor, and the controller is connected to the gate of the MOS transistor, so that the on/off of the detection circuit can be directly controlled.
Preferably, the control circuit 20 further includes:
a power module 23 for supplying power;
and the voltage conversion module 24 is respectively connected with the power supply module and the controller, and is used for performing voltage reduction processing on the voltage input by the power supply module and outputting the voltage to the controller.
Specifically, control circuit in this embodiment still include power module and voltage conversion module, solitary power module, guarantee to carry out lasting power supply to whole control circuit, realized separating whole short circuit detection device and lithium cell power supply circuit, can guarantee the accuracy that lithium cell short circuit detected, improved lithium cell short circuit detection's reliability. Meanwhile, in order to ensure that the voltage provided by the power supply module is adaptive to the controller, the voltage conversion module is matched to step down the voltage provided by the power supply module to reach the voltage adaptive to the controller, so that the normal operation of the controller is ensured, the controller is prevented from being damaged by overhigh voltage, and the safety and the reliability of the control circuit are ensured. The voltage of the power supply module is 5V, the voltage conversion module can be an element which has a voltage reduction effect and can ensure that the voltage after voltage reduction can be adapted to the controller, and the specific element of the voltage conversion module is not specifically limited and can be determined according to specific requirements.
This embodiment provides a lithium cell short circuit detection device, restricts the electric current that flows through detection device through power resistance, adopts the shunt to gather the electric current simultaneously to utilize the isolation fortune to put the module and enlarge the processing to the voltage that the shunt gathered, under the circumstances of guaranteeing that detection device is not damaged by the strong current in the twinkling of an eye, guarantee current detection's validity, reduced circuit cost, improved short circuit detection device's security and reliability.
Example 2
The embodiment provides a lithium battery power supply control system, including: a lithium battery 30, a load 40 and a lithium battery short circuit detection device 50 as described in embodiment 1. As shown in fig. 2, the lithium battery 30, the load 40, and the lithium battery short detection device 50 are connected in series.
The lithium battery power supply control system that this embodiment provided, establish ties lithium battery short circuit detection device to lithium battery supply circuit in, can more directly carry out the short circuit to whole lithium battery supply circuit and detect, the circuit cost is reduced, also can be more accurate carry out the short circuit detection to lithium battery supply circuit simultaneously, realized carrying out more accurate short circuit detection to the lithium battery circuit under the simple condition of technical scheme, lithium battery supply circuit short circuit detection reliability has been improved, lithium battery supply system's security has been guaranteed.
Specifically, the lithium battery power supply control system further includes: the power control circuit 60 is connected in series with the lithium battery 30 and the load 40, and is connected in parallel with the lithium battery short-circuit detection device 50.
According to the lithium battery power supply control system provided by the embodiment of the invention, the power control loop and the lithium battery short-circuit detection device are connected in parallel and are connected in series in the lithium battery power supply loop, which is equivalent to that two switches are arranged for the whole lithium battery power supply system, the lithium battery power supply loop is separated from the detection circuit, and the lithium battery short-circuit detection device is closed before the power control circuit is closed, so that the short-circuit detection of the whole system under the same power supply system is ensured, the accuracy of short-circuit detection can be ensured, and the reliability of short-circuit detection is improved. Meanwhile, the direct damage to the whole system caused by directly closing the power control loop can be prevented, and the safety of the whole lithium battery power supply control system is improved.
Preferably, the lithium battery power supply control system provided by the embodiment is used for a vehicle-mounted lithium battery.
Specifically, this embodiment lithium battery power supply control system can be used for on-vehicle lithium cell, on-vehicle lithium cell short circuit can emit the electric current of kilo ampere level in the twinkling of an eye, and the electric current volume is very big, if directly detect this electric current, will cause very big damage to detection device, also has the possibility of damaging whole power supply system simultaneously, and the security is extremely low. Therefore, the short-circuit detection device in the present system can effectively improve the safety of the entire power supply system, and can improve the reliability of short-circuit detection with the use of the lithium battery short-circuit detection device described in embodiment 1. The application scene of the lithium battery and the scale of the lithium battery are not specifically limited in the embodiment, and the lithium battery is only applicable to the vehicle-mounted lithium battery and can also be applied to other types of lithium batteries, and the specific application can be changed according to specific conditions.
The lithium battery power supply control system that this embodiment provided, connect power control return circuit and lithium battery short circuit detection device in parallel, and establish ties in lithium battery power supply return circuit, before power control circuit is closed, closed lithium battery short circuit detection device, carry out short circuit detection to whole lithium battery power supply return circuit, because it is directly to establish ties in lithium battery power supply return circuit and detect, can realize carrying out short circuit detection to whole system under the same power supply system with power control return circuit, can guarantee the accuracy that short circuit detected, the reliability that short circuit detected has been improved. Meanwhile, the direct damage to the whole system caused by directly closing the power control loop can be prevented, and the safety of the whole lithium battery power supply control system is improved.
Example 3
The embodiment of the invention provides a detection method of a lithium battery short circuit detection device, which is applied to any implementation mode in embodiment 1 and embodiment 1, and as shown in fig. 3, the detection method comprises the following specific steps:
s11, detecting the current and the current duration passing through the detection circuit;
s12, judging whether the current time passing through the detection circuit exceeds the preset time;
and S13, determining that the lithium battery power supply loop is short-circuited when the preset time is exceeded.
According to the detection method of the lithium battery short circuit detection device provided by the embodiment of the invention, when the switch module is closed, the current in a short time can be generated at the moment of closing the switch module in a normal working state; under the short circuit state, power resistance can produce fixed electric current size when switch module is closed to duration is than longer, consequently compares with predetermined time through the size of ground current with the electric current duration with detection circuitry, in order to reach the purpose to lithium cell short circuit detection. When the battery works normally, high voltage in a short time can be generated at the moment when the switch module is closed, and the current duration time is very short; when the lithium battery power supply system is in short circuit, current with longer duration can be generated, and the generated current often exceeds the current of the lithium battery power supply system in a normal working state, so that when the current duration of the detection circuit exceeds the preset time, the short circuit of the lithium battery power supply circuit is shown.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The utility model provides a lithium cell short circuit detection device which characterized in that establishes ties with the load on the lithium cell power supply circuit, lithium cell short circuit detection device includes:
a detection circuit, comprising: the power resistor, the switch module and the current acquisition module are sequentially connected in series and are connected with the load in series, and the power resistor is used for limiting the current flowing through the lithium battery short circuit detection device; the switch module is used for controlling the on-off operation of the detection circuit; the current acquisition module is used for acquiring the current of the lithium battery power supply loop;
and the control circuit is connected with the control end of the switch module and the current acquisition module respectively and is used for controlling the switch module to be closed, judging whether the current time passing through the detection circuit exceeds the preset time or not, and determining the short circuit of the lithium battery power supply loop when the current time exceeds the preset time.
2. The lithium battery short circuit detection device of claim 1, wherein the control circuit comprises:
the signal processing module is connected with the current acquisition module and is used for processing the acquired signals;
and the controller is respectively connected with the signal processing module and the control end of the switch module and is used for controlling the switch module to be closed, judging whether the current time passing through the detection circuit exceeds the preset time or not, and determining the short circuit of the lithium battery power supply loop when the current time exceeds the preset time.
3. The lithium battery short circuit detection device of claim 2, wherein the current collection module is a shunt, and wherein the signal processing module is connected to two ends of the shunt for detecting a voltage across the shunt.
4. The lithium battery short circuit detection device of claim 3, wherein the signal processing module is an isolation operational amplifier module, and is configured to collect the voltage output by the shunt and perform amplification processing.
5. The lithium battery short circuit detection device of claim 2, wherein the switch module is an MOS transistor, and a gate of the MOS transistor is connected to the controller.
6. The lithium battery short circuit detection device of claim 2, wherein the control circuit further comprises:
the power supply module is used for providing electric energy;
and the voltage conversion module is respectively connected with the power module and the controller and is used for reducing the voltage input by the power module and outputting the reduced voltage to the controller.
7. A lithium battery power supply control system, comprising: a lithium battery, a load and a lithium battery short-circuit detection device as claimed in any one of claims 1 to 6, said lithium battery, said load and said lithium battery short-circuit detection device being connected in series.
8. The lithium battery power supply control system of claim 7, further comprising:
and the power control loop is connected with the lithium battery and the load in series and is connected with the lithium battery short circuit detection device in parallel.
9. The lithium battery power supply control system according to claim 7 or 8, characterized by being used for an on-board lithium battery.
10. A detection method for the lithium battery short circuit detection device according to any one of claims 1 to 6, comprising:
detecting a current and a current duration through the detection circuit;
judging whether the current time passing through the detection circuit exceeds a preset time or not;
and when the preset time is exceeded, determining that the lithium battery power supply loop is short-circuited.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599306.5A CN112816894A (en) | 2020-12-29 | 2020-12-29 | Lithium battery short circuit detection device and method and lithium battery power supply control system |
| PCT/CN2021/085438 WO2022141920A1 (en) | 2020-12-29 | 2021-04-02 | Lithium battery short-circuit detection device and method, and lithium battery power supply control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599306.5A CN112816894A (en) | 2020-12-29 | 2020-12-29 | Lithium battery short circuit detection device and method and lithium battery power supply control system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946093A (en) * | 2012-11-09 | 2013-02-27 | 谢亚平 | Short-circuit protection circuit of lithium battery |
| CN104868450A (en) * | 2015-05-29 | 2015-08-26 | 河南森源重工有限公司 | Lithium battery pack short-circuit protection circuit |
| CN109659907A (en) * | 2018-12-24 | 2019-04-19 | 惠州市蓝微电子有限公司 | A kind of lithium battery short-circuit detection protection method |
| CN110249231A (en) * | 2017-02-13 | 2019-09-17 | 罗伯特·博世有限公司 | The circuit and method of slow short circuit in bridge circuit for identification |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094931A (en) * | 2011-10-28 | 2013-05-08 | 东莞钜威新能源有限公司 | Power supply system and power protection circuit thereof |
| CN102790374B (en) * | 2011-12-19 | 2015-01-28 | 洛阳理工学院 | Short circuit protection circuit |
| JP2015121418A (en) * | 2013-12-20 | 2015-07-02 | 株式会社デンソー | Abnormality detection device for electric load driving apparatus |
| CN103928958B (en) * | 2014-04-08 | 2016-02-03 | 深圳桑达国际电源科技有限公司 | A kind of charging and discharging lithium battery management circuit and lithium battery management system |
| CN109901004B (en) * | 2019-02-20 | 2021-02-23 | 北京航空航天大学 | Method and system for detecting short circuit in vehicle-mounted power battery |
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- 2021-04-02 WO PCT/CN2021/085438 patent/WO2022141920A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946093A (en) * | 2012-11-09 | 2013-02-27 | 谢亚平 | Short-circuit protection circuit of lithium battery |
| CN104868450A (en) * | 2015-05-29 | 2015-08-26 | 河南森源重工有限公司 | Lithium battery pack short-circuit protection circuit |
| CN110249231A (en) * | 2017-02-13 | 2019-09-17 | 罗伯特·博世有限公司 | The circuit and method of slow short circuit in bridge circuit for identification |
| CN109659907A (en) * | 2018-12-24 | 2019-04-19 | 惠州市蓝微电子有限公司 | A kind of lithium battery short-circuit detection protection method |
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| WO2022141920A1 (en) | 2022-07-07 |
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Application publication date: 20210518 |