Temperature measurement abnormality detection circuit and temperature measurement abnormality automatic detection method

Abstract

The present invention relates to a temperature measurement abnormality detection circuit and an automatic temperature measurement abnormality detection method, which are applied to a BMS battery management system, wherein the temperature measurement abnormality detection circuit comprises a first controller and a plurality of detection modules correspondingly connected to a plurality of thermistors RTn; a first end of a first resistor element in a single detection module is connected to a power input end, and a second end of the first resistor element is connected to a corresponding single thermistor RTn through a first switch unit; another end of the second end of the first resistor element is connected to a second resistor element through a second switch unit, and the other end of the second resistor element is grounded; the first controller is respectively connected to the first switch unit, the second switch unit and the second end of the first resistor element in each detection module, so as to quickly detect whether the circuit where the thermistor is located is abnormal, and the specific cause of the abnormality.

Description

Technical Field

[0001] The present invention relates to a BMS battery management system, and in particular to a temperature measurement abnormality detection circuit and a temperature measurement abnormality automatic detection method. Background Art

[0002] In the design of BMS (BATTERY MANAGEMENT SYSTEM), the accuracy and reliability of temperature detection must be strictly ensured, because abnormal temperature may lead to thermal runaway, which is unbearable in power batteries. Therefore, temperature accuracy, reliability and fault warning are very important.

[0003] In the related art, the temperature is detected by thermistors with wires. However, in the power battery, the battery pack is far away from the BMS, and the temperature detection needs to use thermistors with wires. Generally, the wire length ranges from a few centimeters to tens of centimeters, and the number of thermistors with wires ranges from a few to a dozen. These thermistors with wires are generally tied together as wire harnesses. Although they are insulated, they are inevitably short-circuited due to damage or other reasons, and there are also cases where the wires fall off and break due to vibration and other reasons. These situations will cause several thermistors to short-circuit together or a wire to break, resulting in abnormal or even failure of the temperature measurement function. When the temperature of the BMS system fails, the cause of the failure cannot be correctly determined or the failure cannot be identified, which will lead to thermal runaway, and in severe cases may trigger a safety accident. Summary of the invention

[0004] The technical problem to be solved by the present invention is that several thermistors in a BMS battery management system are prone to abnormal connection during use, resulting in abnormal temperature measurement function. A temperature measurement abnormality detection circuit and an automatic temperature measurement abnormality detection method are provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing a temperature measurement abnormality detection circuit, which acts on a BMS battery management system, and the BMS battery management system includes a plurality of thermistors RTn for detecting temperature, and is characterized in that the detection circuit includes a first controller and a plurality of detection modules correspondingly connected to the plurality of thermistors RTn;

[0006] A single detection module includes a first resistor element, a first switch unit, a second switch unit, and a second resistor element; a first end of the first resistor element is connected to a power input end, a second end of the first resistor element is connected to a corresponding single thermistor RTn through the first switch unit, and the other end of the thermistor RTn is grounded; another end of the second end of the first resistor element is connected to the second resistor element through the second switch unit, and the other end of the second resistor element is grounded;

[0007] The first controller is respectively connected to the second end of the first resistor element, the first switch unit and the second switch unit in each detection module; the first controller controls the on and off of the corresponding first switch unit and the second switch unit respectively and measures the change in the voltage value of the second end of the corresponding first resistor element, and then detects whether the circuit in which the thermistor RTn connected to the first resistor element is located is abnormal.

[0008] Preferably, the first switch unit includes a first MOS transistor device Qn, and the second switch unit includes a second MOS transistor device Q2n;

[0009] The drain of the first MOS transistor device Qn is connected to the second end of the first resistor element, the gate thereof is connected to the first output pin of the first controller for outputting a control signal, and the source thereof is connected to the corresponding thermistor RTn;

[0010] The drain of the second MOS transistor device Q2n is connected to the second end of the first resistor element, the gate thereof is connected to the second output pin of the first controller for outputting a control signal, and the source thereof is connected to the second resistor element.

[0011] Preferably, the BMS battery management system also includes an air supply component for heat dissipation; the first controller is electrically connected to the air supply component to control its operation; according to the change in the voltage value of the second end of the first resistance element connected to the corresponding thermistor RTn before and after the operation of the air supply component, it is determined whether the two ends of the corresponding thermistor RTn are short-circuited.

[0012] Preferably, the first controller is configured to control the on and off of the corresponding first switch unit and the second switch unit in the two detection modules, and respectively detect the changes in the voltage value of the second end of the corresponding first resistor element in the two detection modules, so as to determine whether the corresponding two collection pins for collecting voltage values ​​connected to the two detection modules in the first controller are short-circuited.

[0013] Preferably, it is characterized in that the resistance value of the second resistor element in each of the detection modules is different.

[0014] The present invention also constructs a method for automatically detecting temperature abnormality, which acts on a BMS battery management system, and the BMS battery management system includes a plurality of thermistors RTn for detecting temperature; the method is characterized in that the method for automatically detecting temperature abnormality includes the following steps:

[0015] S10: electrically connecting the above-mentioned temperature abnormality detection circuit to a plurality of thermistors RTn respectively;

[0016] S20: According to a preset control rule, the first controller outputs first control information to act on the corresponding detection module to control the corresponding first switch unit and the second switch unit to be turned on and off, and the first control information at least includes a first control signal and a second control signal output in sequence;

[0017] S30: According to the first control information, the first controller collects a first voltage signal at the second end of the first resistor element after the first control signal acts on the corresponding detection module, and a second voltage signal at the second end of the first resistor element after the second control signal acts on the corresponding detection module;

[0018] S40: Determine whether the circuit where the corresponding thermistor RTn is located is abnormal according to the first control signal and the first voltage signal, the second control signal and the second voltage signal.

[0019] Preferably, step S40 includes the following sub-steps:

[0020] S41: If the first control signal is to control the first switch unit and the second switch unit in one of the detection modules to be closed, and the second control signal is to control the first switch unit in the one of the detection modules to be opened, and the second switch unit remains closed;

[0021] Determine whether the first voltage signal in the one detection module is equal to the second voltage signal; if so, it means that the circuit of the thermistor RTn connected to the one detection module is broken; if not, it means that there is no abnormality.

[0022] Preferably, step S40 includes the following sub-steps:

[0023] S42: If the first control signal is to control the first switch unit in the first detection module to be closed and the second switch unit to be opened, the second control signal is to control the first switch unit and the second switch unit in the second detection module to be closed;

[0024] Determine whether the first voltage signal is equal to the second voltage signal; if so, it means that there is no abnormality; if not, it means that the corresponding two thermistors RTn respectively connected to the first detection module and the second detection module are short-circuited together.

[0025] Preferably, after step S40, the following steps are further included:

[0026] S50: The first controller outputs second control information to act on the corresponding detection module, where the second control information includes a third control signal and a fourth control signal output in sequence;

[0027] The third control signal is used to control the first switch unit in the first detection module to be disconnected and the second switch unit to be closed, and the fourth control signal is used to control the first switch unit in the second detection module to be disconnected and the second switch unit to be closed;

[0028] The first controller respectively collects a third voltage signal at the second end of the first resistor element after the third control signal acts on the first detection module, and a fourth voltage signal at the second end of the first resistor element after the fourth control signal acts on the second detection module;

[0029] Determine whether the third voltage signal is equal to the fourth voltage signal; if so, it indicates that two connecting pins in the first controller for connecting the first resistance element in the first detection module and the second detection module are short-circuited.

[0030] Preferably, the BMS battery management system further includes an air supply component for heat dissipation; the first controller is electrically connected to the air supply component to control its operation;

[0031] After step S40, the following steps are also included:

[0032] S60: the first controller controls the first switch unit in the corresponding detection module to close, and collects a fifth voltage signal at the second end of the first resistance element in the corresponding detection module;

[0033] S61: Keep the first switch unit in the corresponding detection module closed, the first controller controls the air supply component to turn on, and collects the sixth voltage signal of the second end of the first resistance element in the corresponding detection module;

[0034] S62: Determine whether the fifth voltage signal is equal to the sixth voltage signal; if so, it indicates that the two ends of the thermistor RTn connected to the corresponding detection module are short-circuited; if not, it indicates that there is no abnormality.

[0035] The implementation of the present invention has the following beneficial effects: by electrically connecting the temperature measurement abnormality detection circuit to the BMS battery management system including the thermistor, it is possible to quickly detect whether the circuit in which the thermistor is located is abnormal, as well as the specific cause of the abnormality; at the same time, it also solves the problem that the BMS battery management system is unable to judge the cause of the fault or cannot identify the fault when a temperature fault occurs, plays the role of early warning, and improves the safety performance of the BMS battery management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0037] Figure 1-Figure 2 It is a circuit principle diagram of the temperature measurement abnormality detection circuit of the present invention. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0039] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0041] In the related art, the BMS battery management system includes several thermistors RTn for detecting temperature, wherein the resistance value of the thermistor RTn changes at different temperatures, and the two ends of the thermistor RTn are connected to the circuit to detect its resistance value. According to the relationship table of the resistance value of the thermistor RTn corresponding to the temperature, it can be detected whether the internal temperature of the BMS battery management system is normal. In addition, the BMS battery management system also includes an air supply component, which is used to dissipate heat for the BMS battery management system. The resistance value of the thermistor RTn will also change during the heat dissipation process.

[0042] However, in the power battery, the battery pack is far away from the BMS battery management system, so the connecting wires for accessing the circuit at both ends of the thermistor RTn are too long, and the general length of the wires ranges from a few centimeters to tens of centimeters. There are many thermistors RTn, which are generally tied together with wire harnesses. During transportation or use, they may be short-circuited due to damage, or they may fall off and break due to vibration, resulting in abnormal temperature measurement function.

[0043] In order to solve the problem that several thermistors in a BMS battery management system are prone to abnormal connection during use, resulting in abnormal temperature measurement function, the present invention creates a temperature measurement abnormality detection circuit and an automatic temperature measurement abnormality detection method.

[0044] The temperature abnormality detection circuit includes a first controller 2 and a plurality of detection modules 1 correspondingly connected to a plurality of thermistors RTn;

[0045] A single detection module 1 includes a first resistor element 11, a first switch unit 12, a second switch unit 13, and a second resistor element 14; a first end of the first resistor element 11 is connected to a power input end, a second end of the first resistor element 11 is connected to a corresponding single thermistor RTn through the first switch unit 12, and the other end of the thermistor RTn is grounded; another end of the second end of the first resistor element 11 is connected to a second resistor element 14 through the second switch unit 13, and the other end of the second resistor element 14 is grounded;

[0046] The first controller 2 is respectively connected to the first switch unit 12, the second switch unit 13 and the second end of the first resistor element 11 in each detection module 1; the first controller 2 is configured to control the on and off of the corresponding first switch unit 12 and the second switch unit 13 according to a first preset rule and measure the change in the voltage value of the second end of the corresponding first resistor element 11, and then detect whether the circuit in which the thermistor RTn connected to the first resistor element 11 is located is abnormal.

[0047] It can be understood that the abnormal circuit situation of the thermistor RTn includes one or more combinations of the following: the connection line connecting the thermistor RTn is broken, the thermistor RTn itself is broken, the thermistor RTn itself is short-circuited, the connection lines at both ends of the thermistor RTn are short-circuited, and several adjacent thermistors RTn are short-circuited together. It should be noted that several adjacent thermistors RTn refer to several thermistors RTn that are adjacent in distance, and do not refer to the thermistors RTn as shown in the attached figure. Figure 1 The thermistors RTn are adjacent to each other in the circuit schematic.

[0048] Further, the first switch unit 12 is a first MOS transistor device Qn, and the second switch unit 13 is a second MOS transistor device Q2n;

[0049] The drain of the first MOS transistor device Qn is connected to the second end of the first resistor element 11, the gate thereof is connected to the first output pin of the first controller 2 for outputting a control signal, and the source thereof is connected to the corresponding thermistor RTn;

[0050] The drain of the second MOS transistor device Q2 n is connected to the second end of the first resistor element 11 , the gate thereof is connected to the second output pin of the first controller 2 for outputting a control signal, and the source thereof is connected to the second resistor element 14 .

[0051] Furthermore, the first controller 2 is electrically connected to the air supply component in the BMS battery management system to control its operation; according to the change in the voltage value of the second end of the first resistance element 11 connected to the corresponding thermistor RTn before and after the air supply component works, it is determined whether the two ends of the corresponding thermistor RTn are short-circuited.

[0052] Furthermore, when the two acquisition pins of the first controller 2 used to collect and read the voltage value are short-circuited, the temperature values ​​of the two thermistors RTn corresponding to the two pins will be the same. At this time, it will be mistakenly believed that the battery temperatures measured by the two thermistors RTn are the same, but the actual temperatures on the batteries may be different, resulting in misjudgment. The detection circuit can also detect whether there is an abnormal connection between several pins in the first controller 2. For example, the short circuit between the above-mentioned acquisition pins is caused by metal particles and the like. Specifically, the first controller 2 controls the on and off of the corresponding first switch unit 12 and the second switch unit 13 in the two detection modules 1 according to the second preset rule, and respectively detects the voltage value changes at the second ends of the corresponding first resistor elements 11 in the two detection modules 1 to determine whether the two corresponding acquisition pins connected to the two detection modules 1 in the first controller 2 are short-circuited.

[0053] Optionally, the first controller 2 may use a control chip of model ATMEGA16.

[0054] Preferably, the first MOS transistor device Qn and the second MOS transistor device Q2n are MOS transistors with as small internal resistance as possible to improve the accuracy of the detection circuit.

[0055] Preferably, the second resistor element 14 in each detection module 1 is selected from resistor elements with different resistance values, and avoid selecting resistor elements with a resistance value of 10K; because the internal resistance of the thermistor RTn at room temperature is generally 10K, which will affect the detection result.

[0056] Preferably, the first resistance element 11 and the second resistance element 14 are made of high-precision resistance elements to improve the accuracy of the detection circuit.

[0057] The following is an explanation of the working principle of the entire temperature abnormality detection circuit. Figure 1 and Figure 2 As shown, Figure 1 The case of detecting four thermistors RTn is listed in the figure, including the first thermistor RT1, the second thermistor RT2, the third thermistor RT3 and the fourth thermistor RT4. However, for the sake of simplicity, only the specific case of the first thermistor RT1 and the second thermistor RT2 is listed below. The specific connection relationship is as follows:

[0058] The first detection module is connected to the first thermistor RT1, and the second detection module is connected to the second thermistor RT2; specifically,

[0059] The first detection module includes a first resistor R1, a first MOS transistor Q1, a second MOS transistor Q2 and a second resistor R2;

[0060] A first end of the first resistor R1 is connected to a power input terminal; a second end of the first resistor R1 is connected to a drain of a first MOS tube Q1, a source of the first MOS tube Q1 is connected to a first thermistor RT1, and the other end of the first thermistor RT1 is grounded; another second end of the first resistor R1 is connected to a drain of a second MOS tube Q2, a source of the second MOS tube Q2 is connected to a second resistor R2, and the other end of the second resistor R2 is grounded; a gate of the first MOS tube Q1 is connected to a twenty-sixth pin PC7 of a first controller 2; a gate of the second MOS tube Q2 is connected to a twenty-fifth pin PC6 of the first controller 2; and a thirty-seventh pin PA0 of the first controller 2 is also connected to a second end of the first resistor R1 to read a first voltage value T1 of the end.

[0061] The second detection module includes a third resistor R3, a third MOS transistor Q3, a fourth MOS transistor Q4 and a fourth resistor R4;

[0062] A first end of the third resistor R3 is connected to the power input terminal; a second end of the third resistor R3 is connected to the drain of the third MOS tube Q3, a source of the third MOS tube Q3 is connected to the second thermistor RT2, and the other end of the second thermistor RT2 is grounded; another second end of the third resistor R3 is connected to the drain of the fourth MOS tube Q4, a source of the fourth MOS tube Q4 is connected to the fourth resistor R4, and the other end of the fourth resistor R4 is grounded; a gate of the third MOS tube Q3 is connected to the twenty-fourth pin PC5 of the first controller 2; a gate of the fourth MOS tube Q4 is connected to the twenty-third pin PC4 of the first controller 2; and a thirty-sixth pin PA1 of the first controller 2 is also connected to the second end of the third resistor R3 to read the second voltage value T2 of the end.

[0063] When detecting whether the circuit where the first thermistor RT1 is located is open, first close the first MOS transistor Q1 and the second MOS transistor Q2, and read the value of T1 as u1; then disconnect the first MOS transistor Q1, keep the second MOS transistor Q2 closed, and read the value of T1 as u11; if u1=u11, it proves whether the circuit where the first thermistor RT1 is located is open. The same applies to other thermistors RTn.

[0064] When detecting whether the first thermistor RT1 is short-circuited with the second thermistor RT2, firstly close the first MOS tube Q1, disconnect the second MOS tube Q2, and read the value of T1 as u2; then close the third MOS tube Q3 and the fourth MOS tube Q4, read the value of T1 again and determine whether it is u2. If not, it proves that the first thermistor RT1 and the second thermistor RT2 are short-circuited.

[0065] When detecting whether the two ends of the first thermistor RT1 are short-circuited, first close the first MOS tube Q1, read the value of T1 as u4, then turn on the air supply component, read the value of T1 again and determine whether it is u4. If so, it proves that the two ends of the first thermistor RT1 are short-circuited.

[0066] When detecting whether the 37th pin PA0 and the 36th pin PA1 in the first controller 2 are short-circuited, firstly, the first MOS tube Q1 is disconnected, the second MOS tube Q2 is closed, and the value of T1 is read as u3; then the third MOS tube Q3 is disconnected, the fourth MOS tube Q4 is closed, and the value of T2 is read as u33; if u3=u33, it is proved that the 37th pin PA0 and the 36th pin PA1 in the first controller 2 are short-circuited. The other pins are short-circuited and so on, and the same method can be used.

[0067] It can be understood that in the temperature measurement abnormality detection circuit of the present invention, the first controller 2 successively controls the on and off of the corresponding first switch unit 12 and the second switch unit 13, or successively controls the switch of the air supply component, and at the same time measures the change in the voltage value of the second end of the corresponding first resistor element 11 during the successive control, and detects the specific situation of the temperature measurement abnormality based on the change in the voltage value.

[0068] According to the above-mentioned temperature measurement abnormality detection circuit, the present invention also constructs a temperature measurement abnormality automatic detection method, which acts on the BMS battery management system and includes the following steps:

[0069] S10: electrically connecting the temperature abnormality detection circuit to a plurality of thermistors RTn respectively;

[0070] S20: According to a preset control rule, the first controller 2 outputs first control information to act on the corresponding detection module 1 to control the corresponding first switch unit 12 and the second switch unit 13 to be turned on and off, and the first control information at least includes a first control signal and a second control signal output in sequence;

[0071] S30: According to the first control information, the first controller 2 respectively collects a first voltage signal at the second end of the first resistor element 11 after the first control signal acts on the corresponding detection module 1, and a second voltage signal at the second end of the first resistor element 11 after the second control signal acts on the corresponding detection module 1;

[0072] S40: Determine whether the circuit where the corresponding thermistor RTn is located is abnormal according to the first control signal and the first voltage signal, the second control signal and the second voltage signal.

[0073] It can be understood that the preset control rule can refer to the working principle of the above-mentioned entire temperature measurement abnormality detection circuit, and the preset control rule can be input into the first controller 2 by burning before step S10. The first controller 2 automatically controls the on and off of the first switch unit 12 and the second switch unit 13 according to the preset control rule, and collects and determines the magnitude of the voltage signals controlled successively, thereby determining whether the circuit where the thermistor RTn is located is abnormal.

[0074] Furthermore, in step S40, the following sub-steps are included:

[0075] S41: If the first control signal is to control the first switch unit 12 and the second switch unit 13 in one detection module 1 to be closed, and the second control signal is to control the first switch unit 12 in one detection module 1 to be opened, and the second switch unit 13 remains closed;

[0076] It is determined whether the magnitude of the first voltage signal in one detection module 1 is equal to the second voltage signal; if so, it indicates that the circuit of the thermistor RTn connected to one detection module 1 is broken; if not, it indicates that there is no abnormality.

[0077] Furthermore, in step S40, the following sub-steps are included:

[0078] S42: If the first control signal is to control the first switch unit 12 in the first detection module 1 to be closed and the second switch unit 13 to be opened, the second control signal is to control the first switch unit 12 and the second switch unit 13 in the second detection module 1 connected to the first detection module 1 to be closed;

[0079] Determine whether the first voltage signal is equal to the second voltage signal; if so, it means there is no abnormality; if not, it means that the corresponding two thermistors RTn respectively connected to the first detection module 1 and the second detection module 1 are short-circuited together.

[0080] Furthermore, after step S40, the following steps are also included:

[0081] S50: the first controller 2 outputs second control information to act on the corresponding detection module 1, the second control information includes a third control signal and a fourth control signal output in sequence;

[0082] The third control signal is used to control the first switch unit 12 in the first detection module 1 to be disconnected and the second switch unit 13 to be closed. The fourth control signal is used to control the first switch unit 12 in the second detection module 1 connected to the first detection module 1 to be disconnected and the second switch unit 13 to be closed.

[0083] The first controller 2 respectively collects a third voltage signal at the second end of the first resistor element 11 after the third control signal acts on the first detection module 1, and a fourth voltage signal at the second end of the first resistor element 11 after the fourth control signal acts on the second detection module 1;

[0084] It is determined whether the third voltage signal is equal to the fourth voltage signal; if so, it indicates that two connecting pins of the first controller 2 for connecting the first detection module 1 and the first resistance element 11 of the second detection module 1 are short-circuited.

[0085] Furthermore, after step S40, the following steps are also included:

[0086] S60: the first controller 2 controls the first switch unit 12 in the corresponding detection module 1 to close, and collects a fifth voltage signal at the second end of the first resistance element 11 in the corresponding detection module 1;

[0087] S61: Keep the first switch unit 12 in the corresponding detection module 1 closed, the first controller 2 controls the air supply component to turn on, and collects the sixth voltage signal of the second end of the first resistance element 11 in the corresponding detection module 1;

[0088] S62: Determine whether the fifth voltage signal is equal to the sixth voltage signal; if so, it indicates that the two ends of the thermistor RTn connected to the corresponding detection module 1 are short-circuited; if not, it indicates that there is no abnormality.

[0089] In summary, the temperature measurement abnormality detection circuit and the temperature measurement abnormality automatic detection method of the present invention can quickly detect whether the circuit in which the thermistor is located is abnormal, as well as the specific cause of the abnormality; at the same time, it also solves the problem that the BMS battery management system is unable to judge the cause of the fault or cannot identify the fault when a temperature fault occurs, plays the role of early warning, and improves the safety performance of the BMS battery management system.

[0090] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A temperature abnormality detection circuit, It is characterized in that Acting on a BMS battery management system, the BMS battery management system comprises a plurality of thermistors RTn for detecting temperature; the detection circuit comprises a first controller (2) and a plurality of detection modules (1) correspondingly connected to the plurality of thermistors RTn; A single detection module (1) comprises a first resistor element (11), a first switch unit (12), a second switch unit (13), and a second resistor element (14); a first end of the first resistor element (11) is connected to a power input end, a second end of the first resistor element (11) is connected to a corresponding single thermistor RTn through the first switch unit (12), and the other end of the thermistor RTn is grounded; another end of the second end of the first resistor element (11) is connected to the second resistor element (14) through the second switch unit (13), and the other end of the second resistor element (14) is grounded; The first controller (2) is respectively connected to the second end of the first resistor element (11), the first switch unit (12) and the second switch unit (13) in each detection module (1); the first controller (2) controls the on and off of the corresponding first switch unit (12) and the second switch unit (13) in sequence and measures the change in the voltage value of the second end of the corresponding first resistor element (11), thereby detecting whether the circuit in which the thermistor RTn connected to the first resistor element (11) is located is abnormal.

2. The temperature measurement abnormality detection circuit according to claim 1, It is characterized in that The first switch unit (12) comprises a first MOS transistor device Qn, and the second switch unit (13) comprises a second MOS transistor device Q2n; The drain of the first MOS transistor device Qn is connected to the second end of the first resistor element (11), the gate thereof is connected to a first output pin of the first controller (2) for outputting a control signal, and the source thereof is connected to a corresponding thermistor RTn; The drain of the second MOS transistor device Q2n is connected to the second end of the first resistor element (11), the gate thereof is connected to the second output pin of the first controller (2) for outputting a control signal, and the source thereof is connected to the second resistor element (14).

3. The temperature measurement abnormality detection circuit according to claim 1, It is characterized in that The BMS battery management system also includes an air supply component for heat dissipation; the first controller (2) is electrically connected to the air supply component to control its operation; and according to the change in the voltage value of the second end of the first resistor element (11) connected to the corresponding thermistor RTn before and after the air supply component operates, it is determined whether the two ends of the corresponding thermistor RTn are short-circuited.

4. The temperature measurement abnormality detection circuit according to claim 1, It is characterized in that The first controller (2) is configured to control the on and off of the first switch unit (12) and the second switch unit (13) corresponding to the two detection modules (1), and respectively detect the change in the voltage value of the second end of the first resistor element (11) corresponding to the two detection modules (1), so as to determine whether the corresponding two acquisition pins for collecting voltage values ​​in the first controller (2) connected to the two detection modules (1) are short-circuited.

5. The temperature measurement abnormality detection circuit according to any one of claims 1 to 4, It is characterized in that The resistance value of the second resistance element (14) in each detection module (1) is different.

6. A method for automatically detecting abnormal temperature measurement, which acts on a BMS battery management system, wherein the BMS battery management system includes a plurality of thermistors RTn for detecting temperature; It is characterized in that The method for automatically detecting temperature abnormality comprises the following steps: S10: electrically connecting the temperature measurement anomaly detection circuit according to any one of claims 1 to 4 to a plurality of thermistors RTn respectively; S20: According to a preset control rule, the first controller (2) outputs first control information to act on the corresponding detection module (1) to control the corresponding first switch unit (12) and the second switch unit (13) to be turned on and off, wherein the first control information at least includes a first control signal and a second control signal output in sequence; S30: According to the first control information, the first controller (2) respectively collects a first voltage signal at the second end of the first resistor element (11) after the first control signal acts on the corresponding detection module (1), and a second voltage signal at the second end of the first resistor element (11) after the second control signal acts on the corresponding detection module (1); S40: Determine whether the circuit where the corresponding thermistor RTn is located is abnormal according to the first control signal and the first voltage signal, the second control signal and the second voltage signal.

7. The method for automatically detecting temperature anomalies according to claim 6, It is characterized in that In step S40, the following sub-steps are included: S41: If the first control signal is to control the first switch unit (12) and the second switch unit (13) in one of the detection modules (1) to be closed, the second control signal is to control the first switch unit (12) in one of the detection modules (1) to be opened, and the second switch unit (13) to remain closed; It is determined whether the magnitude of the first voltage signal and the magnitude of the second voltage signal in the first detection module (1) are equal; if so, it indicates that the circuit of the thermistor RTn connected to the first detection module (1) is broken; if not, it indicates that there is no abnormality.

8. The method for automatically detecting temperature anomalies according to claim 6, It is characterized in that In step S40, the following sub-steps are included: S42: If the first control signal is to control the first switch unit (12) in the first detection module (1) to be closed and the second switch unit (13) to be opened, the second control signal is to control the first switch unit (12) and the second switch unit (13) in the second detection module (1) to be closed; It is determined whether the magnitude of the first voltage signal is equal to the magnitude of the second voltage signal; if so, it indicates that there is no abnormality; if not, it indicates that the corresponding two thermistors RTn respectively connected to the first detection module (1) and the second detection module (1) are short-circuited together.

9. The method for automatically detecting temperature anomalies according to any one of claims 6 to 8, It is characterized in that After step S40, the following steps are also included: S50: the first controller (2) outputs second control information to act on the corresponding detection module (1), the second control information comprising a third control signal and a fourth control signal output in sequence; The third control signal is used to control the first switch unit (12) in the first detection module (1) to be disconnected and the second switch unit (13) to be closed, and the fourth control signal is used to control the first switch unit (12) in the second detection module (1) to be disconnected and the second switch unit (13) to be closed; The first controller (2) respectively collects a third voltage signal at the second end of the first resistor element (11) after the third control signal acts on the first detection module (1), and a fourth voltage signal at the second end of the first resistor element (11) after the fourth control signal acts on the second detection module (1); Determine whether the third voltage signal is equal to the fourth voltage signal; if so, it indicates that the two connecting pins in the first controller (2) for connecting the first detection module (1) and the first resistance element (11) in the second detection module (1) are short-circuited.

10. The method for automatically detecting temperature anomalies according to claim 6, It is characterized in that The BMS battery management system also includes an air supply component for heat dissipation; the first controller (2) is electrically connected to the air supply component to control its operation; After step S40, the following steps are also included: S60: the first controller (2) controls the first switch unit (12) in the corresponding detection module (1) to close, and collects a fifth voltage signal at the second end of the first resistance element (11) in the corresponding detection module (1); S61: Keeping the first switch unit (12) in the corresponding detection module (1) closed, the first controller (2) controls the air supply component to open, and collecting a sixth voltage signal at the second end of the first resistance element (11) in the corresponding detection module (1); S62: Determine whether the fifth voltage signal is equal to the sixth voltage signal; if so, it indicates that the two ends of the thermistor RTn connected to the corresponding detection module (1) are short-circuited; if not, it indicates that there is no abnormality.

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