Power battery system pre-charging relay adhesion detection system and detection method

Abstract

The present invention discloses a power battery system pre-charge relay adhesion detection system and detection method. When the voltmeter detects a high voltage, the system first controls the switch S1 to be closed to the resistor R1 side and the resistor R2 side respectively, and measures the voltage of the resistor R3 at the third test point to obtain a first voltage value and a second voltage value. If the first voltage value is greater than the second voltage value, the direction of the current flows from the first test point to the second test point, indicating that the pre-charge relay K2 is adhered. If the first voltage value is less than the second voltage value, the direction of the current flows from the second test point to the first test point, indicating that the positive relay K1 is adhered. If the first voltage value is equal to the second voltage value, the positive relay K1 and the pre-charge relay K2 are adhered at the same time. In this way, it is possible to quickly detect whether the positive relay K1 or the pre-charge relay K2 is adhered, or whether both are adhered at the same time, thereby improving the efficiency and accuracy of the detection.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a system and method for detecting adhesion of a pre-charging relay of a power battery system. Background Art

[0002] Currently, power batteries provide a source of power, primarily used in electric vehicles, electric trains, electric bicycles, and golf carts. Most power batteries are valve-sealed lead-acid batteries, open-type tubular lead-acid batteries, and lithium iron phosphate batteries.

[0003] At present, whether the pre-charging relay or the positive relay is stuck is checked by connecting a voltmeter in parallel with the pre-charging relay and the positive relay for voltage detection. The pre-charging relay requires a larger pre-charging circuit, so the minimum value of the resistance connected in series with the pre-charging relay is small. Therefore, whether the pre-charging relay or the positive relay is stuck, the voltage value measured by the voltmeter is almost the same, which makes it impossible to identify whether the positive relay or the pre-charging relay is stuck, and thus it is impossible to ensure the safety of maintenance personnel in the first time. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a power battery system pre-charging relay adhesion detection system and detection method that can quickly identify positive relay adhesion or pre-charging relay adhesion.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A power battery system pre-charging relay adhesion detection system includes: a pre-charging relay K2, a pre-charging resistor R4, a positive relay K1, a voltage divider module, a test module and a load module. The pre-charging resistor R4 is connected in series with the pre-charging relay K2 and then in parallel with the positive relay K1. The voltage divider module is electrically connected to the pre-charging relay K2, the pre-charging resistor R4 and the positive relay K1 respectively. The test module is electrically connected to the voltage divider module. The load module is electrically connected to the positive relay K1.

[0007] In one embodiment, the voltage divider module includes a resistor R1, a first test point, a resistor R2 and a second test point, the resistor R1 is electrically connected to the first test point, the first test point is electrically connected to the pre-charging relay K2 and the pre-charging resistor R4 respectively, the resistor R2 is electrically connected to the second test point, and the second test point is electrically connected to the pre-charging resistor R4 and the positive relay K1 respectively.

[0008] In one embodiment, the test module includes a switch S1, a third test point and a resistor R3, one end of the switch S1 is used to electrically connect to the resistor R1 and the resistor R2 respectively, the third test point is electrically connected to the other end of the switch S1, and the resistor R3 is electrically connected to the third test point.

[0009] In one embodiment, a negative relay K3 is further included, wherein a first end of the negative relay K3 is electrically connected to the resistor R3 , and a second end of the negative relay K3 is electrically connected to the load module.

[0010] In one embodiment, a voltmeter is further included, wherein a first end of the voltmeter is electrically connected to the load module, and a second end of the voltmeter is electrically connected to a first end of the negative relay K3.

[0011] In one embodiment, a battery module is further included, and the battery module is electrically connected to the resistor R3 and the positive relay K1 respectively.

[0012] A method for detecting sticking of a pre-charging relay of a power battery system according to the system for detecting sticking of a pre-charging relay of a power battery system according to any one of the above embodiments is characterized by comprising the following steps:

[0013] S101, the battery module is powered on so that the voltmeter detects a high voltage;

[0014] S102, controlling the switch S1 to close to the resistor R1, so that the switch S1 is electrically connected to the resistor R1, and measuring a first voltage value of a third test point;

[0015] S103, controlling the switch S1 to close to the resistor R2, so that the switch S1 is electrically connected to the resistor R2, and measuring the second voltage value of the third test point;

[0016] S104: Compare the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively.

[0017] In one embodiment, the step of comparing the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively, specifically includes the following steps:

[0018] If the first voltage value is greater than the second voltage value, generating first potential direction data;

[0019] The pre-charge relay adhesion data is generated according to the first potential direction data.

[0020] In one embodiment, the step of comparing the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively, specifically includes the following steps:

[0021] If the first voltage value is less than the second voltage value, generating second potential direction data;

[0022] The positive relay adhesion data is generated according to the second potential direction data.

[0023] In one embodiment, the step of comparing the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively, specifically includes the following steps:

[0024] If the first voltage value is equal to the second voltage value, generating third potential direction data;

[0025] The relay adhesion data is generated according to the third potential direction data.

[0026] The advantages and beneficial effects of the present invention compared to the prior art are as follows:

[0027] The present invention is a power battery system pre-charge relay adhesion detection system and detection method. When the voltmeter detects a high voltage, it first controls the switch S1 to be closed to the resistor R1 side and measures the point voltage of the third test point to obtain a first voltage value. Then, it controls the switch S1 to be closed to the resistor R2 side and measures the voltage of the third test point to obtain a second voltage value. If the first voltage value is greater than the second voltage value, the direction of the current flows from the first test point to the second test point, indicating that the pre-charge relay K2 is adhered. If the first voltage value is less than the second voltage value, the direction of the current flows from the second test point to the first test point, indicating that the positive relay K1 is adhered. If the first voltage value is equal to the second voltage value, the positive relay K1 and the pre-charge relay K2 are adhered at the same time. In this way, through the above method, it is possible to quickly and accurately detect whether the positive relay K1 or the pre-charge relay K2 is adhered, or whether both are adhered at the same time, thereby improving the efficiency and accuracy of the detection and ensuring the safety of the maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a circuit diagram of a power battery system pre-charging relay adhesion detection system according to one embodiment of the present invention;

[0030] Figure 2 This is a flowchart of the steps of a method for detecting adhesion of a pre-charging relay of a power battery system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0031] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] See also Figure 1 A power battery system pre-charging relay adhesion detection system includes: a pre-charging relay K2, a pre-charging resistor R4, a positive relay K1, a voltage divider module, a test module and a load module. The pre-charging resistor R4 is connected in series with the pre-charging relay K2 and then in parallel with the positive relay K1. The voltage divider module is electrically connected to the pre-charging relay K2, the pre-charging resistor R4 and the positive relay K1 respectively. The test module is electrically connected to the voltage divider module, and the load module is electrically connected to the positive relay K1.

[0035] See also Figure 1 Specifically, the voltage divider module includes a resistor R1, a first test point, a resistor R2 and a second test point. The resistor R1 is electrically connected to the first test point, and the first test point is electrically connected to the pre-charging relay K2 and the pre-charging resistor R4 respectively. The resistor R2 is electrically connected to the second test point, and the second test point is electrically connected to the pre-charging resistor R4 and the positive relay K1 respectively.

[0036] See also Figure 1 More specifically, the test module includes a switch S1, a third test point and a resistor R3, one end of the switch S1 is used to electrically connect to the resistor R1 and the resistor R2 respectively, the third test point is electrically connected to the other end of the switch S1, and the resistor R3 is electrically connected to the third test point.

[0037] It should be noted that the first test point is Figure 1 Point A in the second test point is Figure 1 Point B in the third test point is Figure 1 Point T in the diagram is used to test the voltage of resistor R3. The load module is Figure 1 Component R in. Furthermore, in order to avoid differences in numerical values ​​during the test, the resistances R1 and R2 have the same resistance value and act as a voltage divider, while the resistor R3 is a high-precision measuring resistor. By setting the resistor R3, the accuracy of the measured voltage can be guaranteed. Furthermore, the first test point and the second test point are used to determine the level of the potential, and then determine the direction of the current. When the voltmeter detects a high voltage, it first controls the switch S1 to close to the resistor R1 side and measures the voltage of the resistor R3 to obtain a first voltage value. Then, it controls the switch S1 to close to the resistor R2 side and measures the voltage of the resistor R3 to obtain a second voltage value. If the first voltage value is greater than the second voltage value, the direction of the current is from the first test point to the second test point, indicating that the pre-charge relay K2 is adhered. If the first voltage value is less than the second voltage value, the direction of the current is from the second test point to the first test point, indicating that the positive relay K1 is adhered. If the first voltage value is equal to the second voltage value, the positive relay K1 and the pre-charge relay K2 are adhered at the same time.

[0038] See also Figure 1 Furthermore, in one embodiment, the power battery system pre-charging relay adhesion detection system also includes a negative relay K3, a first end of the negative relay K3 is electrically connected to the resistor R3, and a second end of the negative relay K3 is electrically connected to the load module.

[0039] See also Figure 1 Specifically, the power battery system pre-charging relay adhesion detection system also includes a voltmeter, a first end of the voltmeter is electrically connected to the load module, and a second end of the voltmeter is electrically connected to the first end of the negative relay K3.

[0040] It should be noted that the voltmeter is used to detect whether there is high voltage in the circuit. The detection method of the present application does not judge by controlling the load voltage of the negative relay K3, thereby avoiding safety hazards.

[0041] See also Figure 1Furthermore, in one embodiment, the power battery system pre-charging relay adhesion detection system further includes a battery module, and the battery module is electrically connected to the resistor R3 and the positive relay K1 respectively.

[0042] It should be noted that the battery module is a battery pack, which is used to generate high voltage.

[0043] See also Figure 2 A method for detecting sticking of a pre-charging relay of a power battery system based on the power battery system pre-charging relay sticking detection system of any one of the above embodiments is characterized by comprising the following steps:

[0044] S101, the battery module is powered on so that the voltmeter detects a high voltage;

[0045] S102, controlling the switch S1 to close to the resistor R1, so that the switch S1 is electrically connected to the resistor R1, and measuring a first voltage value of the third test point;

[0046] S103, controlling the switch S1 to close to the resistor R2, so that the switch S1 is electrically connected to the resistor R2, and measuring the second voltage value of the third test point;

[0047] S104: Compare the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively.

[0048] It should be noted that the power battery system pre-charge relay sticking detection method determines the potential of the first and second test points on both sides of the pre-charge resistor to determine the direction of current flowing through the pre-charge group. This determines whether the pre-charge relay or the positive relay is sticking, or both are sticking. The specific determination method is described in the following three embodiments.

[0049] Furthermore, in one embodiment, the step of comparing the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively, specifically includes the following steps:

[0050] If the first voltage value is greater than the second voltage value, generating first potential direction data;

[0051] Pre-charge relay adhesion data is generated according to the first potential direction data.

[0052] It should be noted that when the voltmeter detects the high voltage of the battery module, through the test of the third test point, if the first voltage value is greater than the second voltage value, it means that the potential of the first test point is greater than the potential of the second test point, that is, the above-mentioned first potential direction data, and further indicates that the direction of the current is from the first test point to the second test point, thereby indicating that the pre-charging relay is in a sticky state.

[0053] Furthermore, in one embodiment, the step of comparing the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively, specifically includes the following steps:

[0054] If the first voltage value is less than the second voltage value, generating second potential direction data;

[0055] Positive relay adhesion data is generated based on the second potential direction data.

[0056] It should be noted that when the voltmeter detects the high voltage of the battery module, through the test of the third test point, if the first voltage value is less than the second voltage value, it means that the potential of the first test point is less than the potential of the second test point, that is, the above-mentioned second potential direction data, and further indicates that the direction of the current is from the second test point to the first test point, thereby indicating that the positive relay is in a sticking state.

[0057] Furthermore, in one embodiment, the step of comparing the first voltage value with the second voltage value to generate pre-charge relay adhesion data, positive relay adhesion data, and relay adhesion data, respectively, specifically includes the following steps:

[0058] If the first voltage value is equal to the second voltage value, generating third potential direction data;

[0059] Relay adhesion data is generated based on the third potential direction data.

[0060] It should be noted that when the voltmeter detects the high voltage of the battery module, through the test of the third test point, if the first voltage value is equal to the second voltage value, it means that the potential of the first test point is equal to the potential of the second test point, that is, the above-mentioned third potential direction data, then it means that the positive relay and the pre-charge relay are in a sticky state at the same time.

[0061] In this way, through the above-mentioned detection method, it is possible to quickly identify whether the positive relay in the power battery system is sticky or the pre-charge relay is sticky, or both are sticky at the same time, thereby ensuring the installation of maintenance personnel. At the same time, the above-mentioned detection method adopts a detection method that avoids controlling the negative relay K3 through the load voltage, thereby improving the safety factor.

[0062] Compared with the prior art, the present invention has the following advantages:

[0063] The above-mentioned power battery system pre-charge relay adhesion detection system and detection method, when the voltmeter detects a high voltage, first closes the switch S1 to the resistor R1 side by controlling it, and measures the voltage of the resistor R3 to obtain a first voltage value, then closes the switch S1 to the resistor R2 side by controlling it, and measures the voltage of the resistor R3 to obtain a second voltage value, if the first voltage value is greater than the second voltage value, the direction of the current is from the first test point to the second test point, which indicates that the pre-charge relay K2 is adhered, if the first voltage value is less than the second voltage value, the direction of the current is from the second test point to the first test point, which indicates that the positive relay K1 is adhered, if the first voltage value is equal to the second voltage value, the positive relay K1 and the pre-charge relay K2 are adhered at the same time. In this way, through the above method, it is possible to quickly and accurately detect whether the positive relay K1 or the pre-charge relay K2 is adhered, or whether both are adhered at the same time, thereby improving the efficiency and accuracy of detection.

[0064] The above-described embodiments merely represent several embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for detecting adhesion of a pre-charging relay of a power battery system, implemented based on a system for detecting adhesion of a pre-charging relay of a power battery system, characterized in that: The steps include: The battery module is powered on so that the voltmeter detects a high voltage; controlling the switch S1 to close to the resistor R1 so that the switch S1 is electrically connected to the resistor R1, and measuring a first voltage value at a third test point; controlling the switch S1 to close to the resistor R2 so that the switch S1 is electrically connected to the resistor R2, and measuring a second voltage value of the third test point; Comparing the first voltage value with the second voltage value, generating pre-fill relay adhesion data, positive relay adhesion data, and simultaneous adhesion data of the positive relay and pre-fill relay respectively; if the first voltage value is greater than the second voltage value, generating first potential direction data; generating the pre-fill relay adhesion data based on the first potential direction data; The system includes a pre-charging relay K2, a pre-charging resistor R4, a positive relay K1, a voltage divider module, a test module and a load module. The pre-charging resistor R4 is connected in series with the pre-charging relay K2 and then in parallel with the positive relay K1. The voltage divider module is electrically connected to the pre-charging relay K2, the pre-charging resistor R4 and the positive relay K1 respectively. The test module is electrically connected to the voltage divider module, and the load module is electrically connected to the positive relay K1. The voltage divider module includes a resistor R1, a first test point, a resistor R2 and a second test point. The resistor R1 is electrically connected to the first test point, the first test point is electrically connected to the pre-charging relay K2 and the pre-charging resistor R4 respectively, and the resistor R2 is electrically connected to the second test point. The second test point is electrically connected to the pre-charging resistor R4 and the positive relay K1, respectively, and the resistance value of the resistor R1 is the same as that of the resistor R2; the test module includes a switch S1, a third test point and a resistor R3, one end of the switch S1 is used to electrically connect to the resistor R1 and the resistor R2, respectively, the third test point is electrically connected to the other end of the switch S1, and the resistor R3 is electrically connected to the third test point; the system also includes a negative relay K3, a first end of the negative relay K3 is electrically connected to the resistor R3, and a second end of the negative relay K3 is electrically connected to the load module; the system also includes a battery module, which is electrically connected to the resistor R3 and the positive relay K1, respectively.

2. The method for detecting adhesion of a pre-charging relay of a power battery system according to claim 1, wherein: In the step of comparing the first voltage value with the second voltage value to respectively generate pre-charge relay adhesion data, positive relay adhesion data, and positive relay and pre-charge relay adhesion data, the following steps are specifically included: If the first voltage value is equal to the second voltage value, generating third potential direction data; According to the third potential direction data, simultaneous adhesion data of the positive relay and the pre-charge relay is generated.

3. The method for detecting adhesion of a pre-charging relay of a power battery system according to claim 1, wherein: The system further includes a voltmeter, a first end of the voltmeter is electrically connected to the load module, and a second end of the voltmeter is electrically connected to the first end of the negative relay K3.

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